Version:  2.0.40 2.2.26 2.4.37 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7

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 <linux/of_net.h>
 33 #include "smsc95xx.h"
 34 
 35 #define SMSC_CHIPNAME                   "smsc95xx"
 36 #define SMSC_DRIVER_VERSION             "1.0.4"
 37 #define HS_USB_PKT_SIZE                 (512)
 38 #define FS_USB_PKT_SIZE                 (64)
 39 #define DEFAULT_HS_BURST_CAP_SIZE       (16 * 1024 + 5 * HS_USB_PKT_SIZE)
 40 #define DEFAULT_FS_BURST_CAP_SIZE       (6 * 1024 + 33 * FS_USB_PKT_SIZE)
 41 #define DEFAULT_BULK_IN_DELAY           (0x00002000)
 42 #define MAX_SINGLE_PACKET_SIZE          (2048)
 43 #define LAN95XX_EEPROM_MAGIC            (0x9500)
 44 #define EEPROM_MAC_OFFSET               (0x01)
 45 #define DEFAULT_TX_CSUM_ENABLE          (true)
 46 #define DEFAULT_RX_CSUM_ENABLE          (true)
 47 #define SMSC95XX_INTERNAL_PHY_ID        (1)
 48 #define SMSC95XX_TX_OVERHEAD            (8)
 49 #define SMSC95XX_TX_OVERHEAD_CSUM       (12)
 50 #define SUPPORTED_WAKE                  (WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
 51                                          WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
 52 
 53 #define FEATURE_8_WAKEUP_FILTERS        (0x01)
 54 #define FEATURE_PHY_NLP_CROSSOVER       (0x02)
 55 #define FEATURE_REMOTE_WAKEUP           (0x04)
 56 
 57 #define SUSPEND_SUSPEND0                (0x01)
 58 #define SUSPEND_SUSPEND1                (0x02)
 59 #define SUSPEND_SUSPEND2                (0x04)
 60 #define SUSPEND_SUSPEND3                (0x08)
 61 #define SUSPEND_ALLMODES                (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
 62                                          SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
 63 
 64 #define CARRIER_CHECK_DELAY (2 * HZ)
 65 
 66 struct smsc95xx_priv {
 67         u32 mac_cr;
 68         u32 hash_hi;
 69         u32 hash_lo;
 70         u32 wolopts;
 71         spinlock_t mac_cr_lock;
 72         u8 features;
 73         u8 suspend_flags;
 74         bool link_ok;
 75         struct delayed_work carrier_check;
 76         struct usbnet *dev;
 77 };
 78 
 79 static bool turbo_mode = true;
 80 module_param(turbo_mode, bool, 0644);
 81 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
 82 
 83 static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
 84                                             u32 *data, int in_pm)
 85 {
 86         u32 buf;
 87         int ret;
 88         int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
 89 
 90         BUG_ON(!dev);
 91 
 92         if (!in_pm)
 93                 fn = usbnet_read_cmd;
 94         else
 95                 fn = usbnet_read_cmd_nopm;
 96 
 97         ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
 98                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 99                  0, index, &buf, 4);
100         if (unlikely(ret < 0)) {
101                 netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
102                             index, ret);
103                 return ret;
104         }
105 
106         le32_to_cpus(&buf);
107         *data = buf;
108 
109         return ret;
110 }
111 
112 static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
113                                              u32 data, int in_pm)
114 {
115         u32 buf;
116         int ret;
117         int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
118 
119         BUG_ON(!dev);
120 
121         if (!in_pm)
122                 fn = usbnet_write_cmd;
123         else
124                 fn = usbnet_write_cmd_nopm;
125 
126         buf = data;
127         cpu_to_le32s(&buf);
128 
129         ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
130                  | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
131                  0, index, &buf, 4);
132         if (unlikely(ret < 0))
133                 netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
134                             index, ret);
135 
136         return ret;
137 }
138 
139 static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
140                                                u32 *data)
141 {
142         return __smsc95xx_read_reg(dev, index, data, 1);
143 }
144 
145 static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
146                                                 u32 data)
147 {
148         return __smsc95xx_write_reg(dev, index, data, 1);
149 }
150 
151 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
152                                           u32 *data)
153 {
154         return __smsc95xx_read_reg(dev, index, data, 0);
155 }
156 
157 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
158                                            u32 data)
159 {
160         return __smsc95xx_write_reg(dev, index, data, 0);
161 }
162 
163 /* Loop until the read is completed with timeout
164  * called with phy_mutex held */
165 static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
166                                                      int in_pm)
167 {
168         unsigned long start_time = jiffies;
169         u32 val;
170         int ret;
171 
172         do {
173                 ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
174                 if (ret < 0) {
175                         netdev_warn(dev->net, "Error reading MII_ACCESS\n");
176                         return ret;
177                 }
178 
179                 if (!(val & MII_BUSY_))
180                         return 0;
181         } while (!time_after(jiffies, start_time + HZ));
182 
183         return -EIO;
184 }
185 
186 static int __smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx,
187                                 int in_pm)
188 {
189         struct usbnet *dev = netdev_priv(netdev);
190         u32 val, addr;
191         int ret;
192 
193         mutex_lock(&dev->phy_mutex);
194 
195         /* confirm MII not busy */
196         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
197         if (ret < 0) {
198                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_read\n");
199                 goto done;
200         }
201 
202         /* set the address, index & direction (read from PHY) */
203         phy_id &= dev->mii.phy_id_mask;
204         idx &= dev->mii.reg_num_mask;
205         addr = (phy_id << 11) | (idx << 6) | MII_READ_ | MII_BUSY_;
206         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
207         if (ret < 0) {
208                 netdev_warn(dev->net, "Error writing MII_ADDR\n");
209                 goto done;
210         }
211 
212         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
213         if (ret < 0) {
214                 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
215                 goto done;
216         }
217 
218         ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
219         if (ret < 0) {
220                 netdev_warn(dev->net, "Error reading MII_DATA\n");
221                 goto done;
222         }
223 
224         ret = (u16)(val & 0xFFFF);
225 
226 done:
227         mutex_unlock(&dev->phy_mutex);
228         return ret;
229 }
230 
231 static void __smsc95xx_mdio_write(struct net_device *netdev, int phy_id,
232                                   int idx, int regval, int in_pm)
233 {
234         struct usbnet *dev = netdev_priv(netdev);
235         u32 val, addr;
236         int ret;
237 
238         mutex_lock(&dev->phy_mutex);
239 
240         /* confirm MII not busy */
241         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
242         if (ret < 0) {
243                 netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_write\n");
244                 goto done;
245         }
246 
247         val = regval;
248         ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
249         if (ret < 0) {
250                 netdev_warn(dev->net, "Error writing MII_DATA\n");
251                 goto done;
252         }
253 
254         /* set the address, index & direction (write to PHY) */
255         phy_id &= dev->mii.phy_id_mask;
256         idx &= dev->mii.reg_num_mask;
257         addr = (phy_id << 11) | (idx << 6) | MII_WRITE_ | MII_BUSY_;
258         ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
259         if (ret < 0) {
260                 netdev_warn(dev->net, "Error writing MII_ADDR\n");
261                 goto done;
262         }
263 
264         ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
265         if (ret < 0) {
266                 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
267                 goto done;
268         }
269 
270 done:
271         mutex_unlock(&dev->phy_mutex);
272 }
273 
274 static int smsc95xx_mdio_read_nopm(struct net_device *netdev, int phy_id,
275                                    int idx)
276 {
277         return __smsc95xx_mdio_read(netdev, phy_id, idx, 1);
278 }
279 
280 static void smsc95xx_mdio_write_nopm(struct net_device *netdev, int phy_id,
281                                      int idx, int regval)
282 {
283         __smsc95xx_mdio_write(netdev, phy_id, idx, regval, 1);
284 }
285 
286 static int smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
287 {
288         return __smsc95xx_mdio_read(netdev, phy_id, idx, 0);
289 }
290 
291 static void smsc95xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
292                                 int regval)
293 {
294         __smsc95xx_mdio_write(netdev, phy_id, idx, regval, 0);
295 }
296 
297 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
298 {
299         unsigned long start_time = jiffies;
300         u32 val;
301         int ret;
302 
303         do {
304                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
305                 if (ret < 0) {
306                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
307                         return ret;
308                 }
309 
310                 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
311                         break;
312                 udelay(40);
313         } while (!time_after(jiffies, start_time + HZ));
314 
315         if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
316                 netdev_warn(dev->net, "EEPROM read operation timeout\n");
317                 return -EIO;
318         }
319 
320         return 0;
321 }
322 
323 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
324 {
325         unsigned long start_time = jiffies;
326         u32 val;
327         int ret;
328 
329         do {
330                 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
331                 if (ret < 0) {
332                         netdev_warn(dev->net, "Error reading E2P_CMD\n");
333                         return ret;
334                 }
335 
336                 if (!(val & E2P_CMD_BUSY_))
337                         return 0;
338 
339                 udelay(40);
340         } while (!time_after(jiffies, start_time + HZ));
341 
342         netdev_warn(dev->net, "EEPROM is busy\n");
343         return -EIO;
344 }
345 
346 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
347                                 u8 *data)
348 {
349         u32 val;
350         int i, ret;
351 
352         BUG_ON(!dev);
353         BUG_ON(!data);
354 
355         ret = smsc95xx_eeprom_confirm_not_busy(dev);
356         if (ret)
357                 return ret;
358 
359         for (i = 0; i < length; i++) {
360                 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
361                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
362                 if (ret < 0) {
363                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
364                         return ret;
365                 }
366 
367                 ret = smsc95xx_wait_eeprom(dev);
368                 if (ret < 0)
369                         return ret;
370 
371                 ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
372                 if (ret < 0) {
373                         netdev_warn(dev->net, "Error reading E2P_DATA\n");
374                         return ret;
375                 }
376 
377                 data[i] = val & 0xFF;
378                 offset++;
379         }
380 
381         return 0;
382 }
383 
384 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
385                                  u8 *data)
386 {
387         u32 val;
388         int i, ret;
389 
390         BUG_ON(!dev);
391         BUG_ON(!data);
392 
393         ret = smsc95xx_eeprom_confirm_not_busy(dev);
394         if (ret)
395                 return ret;
396 
397         /* Issue write/erase enable command */
398         val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
399         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
400         if (ret < 0) {
401                 netdev_warn(dev->net, "Error writing E2P_DATA\n");
402                 return ret;
403         }
404 
405         ret = smsc95xx_wait_eeprom(dev);
406         if (ret < 0)
407                 return ret;
408 
409         for (i = 0; i < length; i++) {
410 
411                 /* Fill data register */
412                 val = data[i];
413                 ret = smsc95xx_write_reg(dev, E2P_DATA, val);
414                 if (ret < 0) {
415                         netdev_warn(dev->net, "Error writing E2P_DATA\n");
416                         return ret;
417                 }
418 
419                 /* Send "write" command */
420                 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
421                 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
422                 if (ret < 0) {
423                         netdev_warn(dev->net, "Error writing E2P_CMD\n");
424                         return ret;
425                 }
426 
427                 ret = smsc95xx_wait_eeprom(dev);
428                 if (ret < 0)
429                         return ret;
430 
431                 offset++;
432         }
433 
434         return 0;
435 }
436 
437 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
438                                                  u32 data)
439 {
440         const u16 size = 4;
441         u32 buf;
442         int ret;
443 
444         buf = data;
445         cpu_to_le32s(&buf);
446 
447         ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
448                                      USB_DIR_OUT | USB_TYPE_VENDOR |
449                                      USB_RECIP_DEVICE,
450                                      0, index, &buf, size);
451         if (ret < 0)
452                 netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
453                             ret);
454         return ret;
455 }
456 
457 /* returns hash bit number for given MAC address
458  * example:
459  * 01 00 5E 00 00 01 -> returns bit number 31 */
460 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
461 {
462         return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
463 }
464 
465 static void smsc95xx_set_multicast(struct net_device *netdev)
466 {
467         struct usbnet *dev = netdev_priv(netdev);
468         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
469         unsigned long flags;
470         int ret;
471 
472         pdata->hash_hi = 0;
473         pdata->hash_lo = 0;
474 
475         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
476 
477         if (dev->net->flags & IFF_PROMISC) {
478                 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
479                 pdata->mac_cr |= MAC_CR_PRMS_;
480                 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
481         } else if (dev->net->flags & IFF_ALLMULTI) {
482                 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
483                 pdata->mac_cr |= MAC_CR_MCPAS_;
484                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
485         } else if (!netdev_mc_empty(dev->net)) {
486                 struct netdev_hw_addr *ha;
487 
488                 pdata->mac_cr |= MAC_CR_HPFILT_;
489                 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
490 
491                 netdev_for_each_mc_addr(ha, netdev) {
492                         u32 bitnum = smsc95xx_hash(ha->addr);
493                         u32 mask = 0x01 << (bitnum & 0x1F);
494                         if (bitnum & 0x20)
495                                 pdata->hash_hi |= mask;
496                         else
497                                 pdata->hash_lo |= mask;
498                 }
499 
500                 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
501                                    pdata->hash_hi, pdata->hash_lo);
502         } else {
503                 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
504                 pdata->mac_cr &=
505                         ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
506         }
507 
508         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
509 
510         /* Initiate async writes, as we can't wait for completion here */
511         ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
512         if (ret < 0)
513                 netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
514 
515         ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
516         if (ret < 0)
517                 netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
518 
519         ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
520         if (ret < 0)
521                 netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
522 }
523 
524 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev, u8 duplex,
525                                            u16 lcladv, u16 rmtadv)
526 {
527         u32 flow, afc_cfg = 0;
528 
529         int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
530         if (ret < 0)
531                 return ret;
532 
533         if (duplex == DUPLEX_FULL) {
534                 u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
535 
536                 if (cap & FLOW_CTRL_RX)
537                         flow = 0xFFFF0002;
538                 else
539                         flow = 0;
540 
541                 if (cap & FLOW_CTRL_TX)
542                         afc_cfg |= 0xF;
543                 else
544                         afc_cfg &= ~0xF;
545 
546                 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
547                                    cap & FLOW_CTRL_RX ? "enabled" : "disabled",
548                                    cap & FLOW_CTRL_TX ? "enabled" : "disabled");
549         } else {
550                 netif_dbg(dev, link, dev->net, "half duplex\n");
551                 flow = 0;
552                 afc_cfg |= 0xF;
553         }
554 
555         ret = smsc95xx_write_reg(dev, FLOW, flow);
556         if (ret < 0)
557                 return ret;
558 
559         return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
560 }
561 
562 static int smsc95xx_link_reset(struct usbnet *dev)
563 {
564         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
565         struct mii_if_info *mii = &dev->mii;
566         struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
567         unsigned long flags;
568         u16 lcladv, rmtadv;
569         int ret;
570 
571         /* clear interrupt status */
572         ret = smsc95xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
573         if (ret < 0)
574                 return ret;
575 
576         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
577         if (ret < 0)
578                 return ret;
579 
580         mii_check_media(mii, 1, 1);
581         mii_ethtool_gset(&dev->mii, &ecmd);
582         lcladv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
583         rmtadv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
584 
585         netif_dbg(dev, link, dev->net,
586                   "speed: %u duplex: %d lcladv: %04x rmtadv: %04x\n",
587                   ethtool_cmd_speed(&ecmd), ecmd.duplex, lcladv, rmtadv);
588 
589         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
590         if (ecmd.duplex != DUPLEX_FULL) {
591                 pdata->mac_cr &= ~MAC_CR_FDPX_;
592                 pdata->mac_cr |= MAC_CR_RCVOWN_;
593         } else {
594                 pdata->mac_cr &= ~MAC_CR_RCVOWN_;
595                 pdata->mac_cr |= MAC_CR_FDPX_;
596         }
597         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
598 
599         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
600         if (ret < 0)
601                 return ret;
602 
603         ret = smsc95xx_phy_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
604         if (ret < 0)
605                 netdev_warn(dev->net, "Error updating PHY flow control\n");
606 
607         return ret;
608 }
609 
610 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
611 {
612         u32 intdata;
613 
614         if (urb->actual_length != 4) {
615                 netdev_warn(dev->net, "unexpected urb length %d\n",
616                             urb->actual_length);
617                 return;
618         }
619 
620         memcpy(&intdata, urb->transfer_buffer, 4);
621         le32_to_cpus(&intdata);
622 
623         netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
624 
625         if (intdata & INT_ENP_PHY_INT_)
626                 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
627         else
628                 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
629                             intdata);
630 }
631 
632 static void set_carrier(struct usbnet *dev, bool link)
633 {
634         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
635 
636         if (pdata->link_ok == link)
637                 return;
638 
639         pdata->link_ok = link;
640 
641         if (link)
642                 usbnet_link_change(dev, 1, 0);
643         else
644                 usbnet_link_change(dev, 0, 0);
645 }
646 
647 static void check_carrier(struct work_struct *work)
648 {
649         struct smsc95xx_priv *pdata = container_of(work, struct smsc95xx_priv,
650                                                 carrier_check.work);
651         struct usbnet *dev = pdata->dev;
652         int ret;
653 
654         if (pdata->suspend_flags != 0)
655                 return;
656 
657         ret = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMSR);
658         if (ret < 0) {
659                 netdev_warn(dev->net, "Failed to read MII_BMSR\n");
660                 return;
661         }
662         if (ret & BMSR_LSTATUS)
663                 set_carrier(dev, 1);
664         else
665                 set_carrier(dev, 0);
666 
667         schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
668 }
669 
670 /* Enable or disable Tx & Rx checksum offload engines */
671 static int smsc95xx_set_features(struct net_device *netdev,
672         netdev_features_t features)
673 {
674         struct usbnet *dev = netdev_priv(netdev);
675         u32 read_buf;
676         int ret;
677 
678         ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
679         if (ret < 0)
680                 return ret;
681 
682         if (features & NETIF_F_HW_CSUM)
683                 read_buf |= Tx_COE_EN_;
684         else
685                 read_buf &= ~Tx_COE_EN_;
686 
687         if (features & NETIF_F_RXCSUM)
688                 read_buf |= Rx_COE_EN_;
689         else
690                 read_buf &= ~Rx_COE_EN_;
691 
692         ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
693         if (ret < 0)
694                 return ret;
695 
696         netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
697         return 0;
698 }
699 
700 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
701 {
702         return MAX_EEPROM_SIZE;
703 }
704 
705 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
706                                        struct ethtool_eeprom *ee, u8 *data)
707 {
708         struct usbnet *dev = netdev_priv(netdev);
709 
710         ee->magic = LAN95XX_EEPROM_MAGIC;
711 
712         return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
713 }
714 
715 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
716                                        struct ethtool_eeprom *ee, u8 *data)
717 {
718         struct usbnet *dev = netdev_priv(netdev);
719 
720         if (ee->magic != LAN95XX_EEPROM_MAGIC) {
721                 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
722                             ee->magic);
723                 return -EINVAL;
724         }
725 
726         return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
727 }
728 
729 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
730 {
731         /* all smsc95xx registers */
732         return COE_CR - ID_REV + sizeof(u32);
733 }
734 
735 static void
736 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
737                          void *buf)
738 {
739         struct usbnet *dev = netdev_priv(netdev);
740         unsigned int i, j;
741         int retval;
742         u32 *data = buf;
743 
744         retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
745         if (retval < 0) {
746                 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
747                 return;
748         }
749 
750         for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
751                 retval = smsc95xx_read_reg(dev, i, &data[j]);
752                 if (retval < 0) {
753                         netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
754                         return;
755                 }
756         }
757 }
758 
759 static void smsc95xx_ethtool_get_wol(struct net_device *net,
760                                      struct ethtool_wolinfo *wolinfo)
761 {
762         struct usbnet *dev = netdev_priv(net);
763         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
764 
765         wolinfo->supported = SUPPORTED_WAKE;
766         wolinfo->wolopts = pdata->wolopts;
767 }
768 
769 static int smsc95xx_ethtool_set_wol(struct net_device *net,
770                                     struct ethtool_wolinfo *wolinfo)
771 {
772         struct usbnet *dev = netdev_priv(net);
773         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
774         int ret;
775 
776         pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
777 
778         ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
779         if (ret < 0)
780                 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
781 
782         return ret;
783 }
784 
785 static const struct ethtool_ops smsc95xx_ethtool_ops = {
786         .get_link       = usbnet_get_link,
787         .nway_reset     = usbnet_nway_reset,
788         .get_drvinfo    = usbnet_get_drvinfo,
789         .get_msglevel   = usbnet_get_msglevel,
790         .set_msglevel   = usbnet_set_msglevel,
791         .get_settings   = usbnet_get_settings,
792         .set_settings   = usbnet_set_settings,
793         .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
794         .get_eeprom     = smsc95xx_ethtool_get_eeprom,
795         .set_eeprom     = smsc95xx_ethtool_set_eeprom,
796         .get_regs_len   = smsc95xx_ethtool_getregslen,
797         .get_regs       = smsc95xx_ethtool_getregs,
798         .get_wol        = smsc95xx_ethtool_get_wol,
799         .set_wol        = smsc95xx_ethtool_set_wol,
800 };
801 
802 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
803 {
804         struct usbnet *dev = netdev_priv(netdev);
805 
806         if (!netif_running(netdev))
807                 return -EINVAL;
808 
809         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
810 }
811 
812 static void smsc95xx_init_mac_address(struct usbnet *dev)
813 {
814         const u8 *mac_addr;
815 
816         /* maybe the boot loader passed the MAC address in devicetree */
817         mac_addr = of_get_mac_address(dev->udev->dev.of_node);
818         if (mac_addr) {
819                 memcpy(dev->net->dev_addr, mac_addr, ETH_ALEN);
820                 return;
821         }
822 
823         /* try reading mac address from EEPROM */
824         if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
825                         dev->net->dev_addr) == 0) {
826                 if (is_valid_ether_addr(dev->net->dev_addr)) {
827                         /* eeprom values are valid so use them */
828                         netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
829                         return;
830                 }
831         }
832 
833         /* no useful static MAC address found. generate a random one */
834         eth_hw_addr_random(dev->net);
835         netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
836 }
837 
838 static int smsc95xx_set_mac_address(struct usbnet *dev)
839 {
840         u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
841                 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
842         u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
843         int ret;
844 
845         ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
846         if (ret < 0)
847                 return ret;
848 
849         return smsc95xx_write_reg(dev, ADDRH, addr_hi);
850 }
851 
852 /* starts the TX path */
853 static int smsc95xx_start_tx_path(struct usbnet *dev)
854 {
855         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
856         unsigned long flags;
857         int ret;
858 
859         /* Enable Tx at MAC */
860         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
861         pdata->mac_cr |= MAC_CR_TXEN_;
862         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
863 
864         ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
865         if (ret < 0)
866                 return ret;
867 
868         /* Enable Tx at SCSRs */
869         return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
870 }
871 
872 /* Starts the Receive path */
873 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
874 {
875         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
876         unsigned long flags;
877 
878         spin_lock_irqsave(&pdata->mac_cr_lock, flags);
879         pdata->mac_cr |= MAC_CR_RXEN_;
880         spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
881 
882         return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
883 }
884 
885 static int smsc95xx_phy_initialize(struct usbnet *dev)
886 {
887         int bmcr, ret, timeout = 0;
888 
889         /* Initialize MII structure */
890         dev->mii.dev = dev->net;
891         dev->mii.mdio_read = smsc95xx_mdio_read;
892         dev->mii.mdio_write = smsc95xx_mdio_write;
893         dev->mii.phy_id_mask = 0x1f;
894         dev->mii.reg_num_mask = 0x1f;
895         dev->mii.phy_id = SMSC95XX_INTERNAL_PHY_ID;
896 
897         /* reset phy and wait for reset to complete */
898         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
899 
900         do {
901                 msleep(10);
902                 bmcr = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
903                 timeout++;
904         } while ((bmcr & BMCR_RESET) && (timeout < 100));
905 
906         if (timeout >= 100) {
907                 netdev_warn(dev->net, "timeout on PHY Reset");
908                 return -EIO;
909         }
910 
911         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
912                 ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
913                 ADVERTISE_PAUSE_ASYM);
914 
915         /* read to clear */
916         ret = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
917         if (ret < 0) {
918                 netdev_warn(dev->net, "Failed to read PHY_INT_SRC during init\n");
919                 return ret;
920         }
921 
922         smsc95xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
923                 PHY_INT_MASK_DEFAULT_);
924         mii_nway_restart(&dev->mii);
925 
926         netif_dbg(dev, ifup, dev->net, "phy initialised successfully\n");
927         return 0;
928 }
929 
930 static int smsc95xx_reset(struct usbnet *dev)
931 {
932         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
933         u32 read_buf, write_buf, burst_cap;
934         int ret = 0, timeout;
935 
936         netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
937 
938         ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
939         if (ret < 0)
940                 return ret;
941 
942         timeout = 0;
943         do {
944                 msleep(10);
945                 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
946                 if (ret < 0)
947                         return ret;
948                 timeout++;
949         } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
950 
951         if (timeout >= 100) {
952                 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
953                 return ret;
954         }
955 
956         ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
957         if (ret < 0)
958                 return ret;
959 
960         timeout = 0;
961         do {
962                 msleep(10);
963                 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
964                 if (ret < 0)
965                         return ret;
966                 timeout++;
967         } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
968 
969         if (timeout >= 100) {
970                 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
971                 return ret;
972         }
973 
974         ret = smsc95xx_set_mac_address(dev);
975         if (ret < 0)
976                 return ret;
977 
978         netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
979                   dev->net->dev_addr);
980 
981         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
982         if (ret < 0)
983                 return ret;
984 
985         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
986                   read_buf);
987 
988         read_buf |= HW_CFG_BIR_;
989 
990         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
991         if (ret < 0)
992                 return ret;
993 
994         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
995         if (ret < 0)
996                 return ret;
997 
998         netif_dbg(dev, ifup, dev->net,
999                   "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
1000                   read_buf);
1001 
1002         if (!turbo_mode) {
1003                 burst_cap = 0;
1004                 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
1005         } else if (dev->udev->speed == USB_SPEED_HIGH) {
1006                 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
1007                 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
1008         } else {
1009                 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
1010                 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
1011         }
1012 
1013         netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
1014                   (ulong)dev->rx_urb_size);
1015 
1016         ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
1017         if (ret < 0)
1018                 return ret;
1019 
1020         ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
1021         if (ret < 0)
1022                 return ret;
1023 
1024         netif_dbg(dev, ifup, dev->net,
1025                   "Read Value from BURST_CAP after writing: 0x%08x\n",
1026                   read_buf);
1027 
1028         ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
1029         if (ret < 0)
1030                 return ret;
1031 
1032         ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
1033         if (ret < 0)
1034                 return ret;
1035 
1036         netif_dbg(dev, ifup, dev->net,
1037                   "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
1038                   read_buf);
1039 
1040         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1041         if (ret < 0)
1042                 return ret;
1043 
1044         netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
1045                   read_buf);
1046 
1047         if (turbo_mode)
1048                 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
1049 
1050         read_buf &= ~HW_CFG_RXDOFF_;
1051 
1052         /* set Rx data offset=2, Make IP header aligns on word boundary. */
1053         read_buf |= NET_IP_ALIGN << 9;
1054 
1055         ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
1056         if (ret < 0)
1057                 return ret;
1058 
1059         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1060         if (ret < 0)
1061                 return ret;
1062 
1063         netif_dbg(dev, ifup, dev->net,
1064                   "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
1065 
1066         ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
1067         if (ret < 0)
1068                 return ret;
1069 
1070         ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
1071         if (ret < 0)
1072                 return ret;
1073         netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
1074 
1075         /* Configure GPIO pins as LED outputs */
1076         write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
1077                 LED_GPIO_CFG_FDX_LED;
1078         ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
1079         if (ret < 0)
1080                 return ret;
1081 
1082         /* Init Tx */
1083         ret = smsc95xx_write_reg(dev, FLOW, 0);
1084         if (ret < 0)
1085                 return ret;
1086 
1087         ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1088         if (ret < 0)
1089                 return ret;
1090 
1091         /* Don't need mac_cr_lock during initialisation */
1092         ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1093         if (ret < 0)
1094                 return ret;
1095 
1096         /* Init Rx */
1097         /* Set Vlan */
1098         ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1099         if (ret < 0)
1100                 return ret;
1101 
1102         /* Enable or disable checksum offload engines */
1103         ret = smsc95xx_set_features(dev->net, dev->net->features);
1104         if (ret < 0) {
1105                 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1106                 return ret;
1107         }
1108 
1109         smsc95xx_set_multicast(dev->net);
1110 
1111         ret = smsc95xx_phy_initialize(dev);
1112         if (ret < 0) {
1113                 netdev_warn(dev->net, "Failed to init PHY\n");
1114                 return ret;
1115         }
1116 
1117         ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1118         if (ret < 0)
1119                 return ret;
1120 
1121         /* enable PHY interrupts */
1122         read_buf |= INT_EP_CTL_PHY_INT_;
1123 
1124         ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1125         if (ret < 0)
1126                 return ret;
1127 
1128         ret = smsc95xx_start_tx_path(dev);
1129         if (ret < 0) {
1130                 netdev_warn(dev->net, "Failed to start TX path\n");
1131                 return ret;
1132         }
1133 
1134         ret = smsc95xx_start_rx_path(dev, 0);
1135         if (ret < 0) {
1136                 netdev_warn(dev->net, "Failed to start RX path\n");
1137                 return ret;
1138         }
1139 
1140         netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1141         return 0;
1142 }
1143 
1144 static const struct net_device_ops smsc95xx_netdev_ops = {
1145         .ndo_open               = usbnet_open,
1146         .ndo_stop               = usbnet_stop,
1147         .ndo_start_xmit         = usbnet_start_xmit,
1148         .ndo_tx_timeout         = usbnet_tx_timeout,
1149         .ndo_change_mtu         = usbnet_change_mtu,
1150         .ndo_set_mac_address    = eth_mac_addr,
1151         .ndo_validate_addr      = eth_validate_addr,
1152         .ndo_do_ioctl           = smsc95xx_ioctl,
1153         .ndo_set_rx_mode        = smsc95xx_set_multicast,
1154         .ndo_set_features       = smsc95xx_set_features,
1155 };
1156 
1157 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1158 {
1159         struct smsc95xx_priv *pdata = NULL;
1160         u32 val;
1161         int ret;
1162 
1163         printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1164 
1165         ret = usbnet_get_endpoints(dev, intf);
1166         if (ret < 0) {
1167                 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1168                 return ret;
1169         }
1170 
1171         dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc95xx_priv),
1172                                               GFP_KERNEL);
1173 
1174         pdata = (struct smsc95xx_priv *)(dev->data[0]);
1175         if (!pdata)
1176                 return -ENOMEM;
1177 
1178         spin_lock_init(&pdata->mac_cr_lock);
1179 
1180         if (DEFAULT_TX_CSUM_ENABLE)
1181                 dev->net->features |= NETIF_F_HW_CSUM;
1182         if (DEFAULT_RX_CSUM_ENABLE)
1183                 dev->net->features |= NETIF_F_RXCSUM;
1184 
1185         dev->net->hw_features = NETIF_F_HW_CSUM | NETIF_F_RXCSUM;
1186 
1187         smsc95xx_init_mac_address(dev);
1188 
1189         /* Init all registers */
1190         ret = smsc95xx_reset(dev);
1191 
1192         /* detect device revision as different features may be available */
1193         ret = smsc95xx_read_reg(dev, ID_REV, &val);
1194         if (ret < 0)
1195                 return ret;
1196         val >>= 16;
1197 
1198         if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1199             (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1200                 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1201                         FEATURE_PHY_NLP_CROSSOVER |
1202                         FEATURE_REMOTE_WAKEUP);
1203         else if (val == ID_REV_CHIP_ID_9512_)
1204                 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1205 
1206         dev->net->netdev_ops = &smsc95xx_netdev_ops;
1207         dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1208         dev->net->flags |= IFF_MULTICAST;
1209         dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1210         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1211 
1212         pdata->dev = dev;
1213         INIT_DELAYED_WORK(&pdata->carrier_check, check_carrier);
1214         schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
1215 
1216         return 0;
1217 }
1218 
1219 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1220 {
1221         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1222 
1223         if (pdata) {
1224                 cancel_delayed_work(&pdata->carrier_check);
1225                 netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1226                 kfree(pdata);
1227                 pdata = NULL;
1228                 dev->data[0] = 0;
1229         }
1230 }
1231 
1232 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1233 {
1234         u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1235         return crc << ((filter % 2) * 16);
1236 }
1237 
1238 static int smsc95xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
1239 {
1240         struct mii_if_info *mii = &dev->mii;
1241         int ret;
1242 
1243         netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
1244 
1245         /* read to clear */
1246         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_SRC);
1247         if (ret < 0)
1248                 return ret;
1249 
1250         /* enable interrupt source */
1251         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_MASK);
1252         if (ret < 0)
1253                 return ret;
1254 
1255         ret |= mask;
1256 
1257         smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_INT_MASK, ret);
1258 
1259         return 0;
1260 }
1261 
1262 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1263 {
1264         struct mii_if_info *mii = &dev->mii;
1265         int ret;
1266 
1267         /* first, a dummy read, needed to latch some MII phys */
1268         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
1269         if (ret < 0)
1270                 return ret;
1271 
1272         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
1273         if (ret < 0)
1274                 return ret;
1275 
1276         return !!(ret & BMSR_LSTATUS);
1277 }
1278 
1279 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1280 {
1281         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1282         u32 val;
1283         int ret;
1284 
1285         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1286         if (ret < 0)
1287                 return ret;
1288 
1289         val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1290         val |= PM_CTL_SUS_MODE_0;
1291 
1292         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1293         if (ret < 0)
1294                 return ret;
1295 
1296         /* clear wol status */
1297         val &= ~PM_CTL_WUPS_;
1298         val |= PM_CTL_WUPS_WOL_;
1299 
1300         /* enable energy detection */
1301         if (pdata->wolopts & WAKE_PHY)
1302                 val |= PM_CTL_WUPS_ED_;
1303 
1304         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1305         if (ret < 0)
1306                 return ret;
1307 
1308         /* read back PM_CTRL */
1309         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1310         if (ret < 0)
1311                 return ret;
1312 
1313         pdata->suspend_flags |= SUSPEND_SUSPEND0;
1314 
1315         return 0;
1316 }
1317 
1318 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1319 {
1320         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1321         struct mii_if_info *mii = &dev->mii;
1322         u32 val;
1323         int ret;
1324 
1325         /* reconfigure link pulse detection timing for
1326          * compatibility with non-standard link partners
1327          */
1328         if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1329                 smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_EDPD_CONFIG,
1330                         PHY_EDPD_CONFIG_DEFAULT);
1331 
1332         /* enable energy detect power-down mode */
1333         ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_MODE_CTRL_STS);
1334         if (ret < 0)
1335                 return ret;
1336 
1337         ret |= MODE_CTRL_STS_EDPWRDOWN_;
1338 
1339         smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_MODE_CTRL_STS, ret);
1340 
1341         /* enter SUSPEND1 mode */
1342         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1343         if (ret < 0)
1344                 return ret;
1345 
1346         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1347         val |= PM_CTL_SUS_MODE_1;
1348 
1349         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1350         if (ret < 0)
1351                 return ret;
1352 
1353         /* clear wol status, enable energy detection */
1354         val &= ~PM_CTL_WUPS_;
1355         val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1356 
1357         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1358         if (ret < 0)
1359                 return ret;
1360 
1361         pdata->suspend_flags |= SUSPEND_SUSPEND1;
1362 
1363         return 0;
1364 }
1365 
1366 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1367 {
1368         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1369         u32 val;
1370         int ret;
1371 
1372         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1373         if (ret < 0)
1374                 return ret;
1375 
1376         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1377         val |= PM_CTL_SUS_MODE_2;
1378 
1379         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1380         if (ret < 0)
1381                 return ret;
1382 
1383         pdata->suspend_flags |= SUSPEND_SUSPEND2;
1384 
1385         return 0;
1386 }
1387 
1388 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1389 {
1390         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1391         u32 val;
1392         int ret;
1393 
1394         ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1395         if (ret < 0)
1396                 return ret;
1397 
1398         if (val & 0xFFFF) {
1399                 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1400                 return -EBUSY;
1401         }
1402 
1403         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1404         if (ret < 0)
1405                 return ret;
1406 
1407         val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1408         val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1409 
1410         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1411         if (ret < 0)
1412                 return ret;
1413 
1414         /* clear wol status */
1415         val &= ~PM_CTL_WUPS_;
1416         val |= PM_CTL_WUPS_WOL_;
1417 
1418         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1419         if (ret < 0)
1420                 return ret;
1421 
1422         pdata->suspend_flags |= SUSPEND_SUSPEND3;
1423 
1424         return 0;
1425 }
1426 
1427 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1428 {
1429         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1430         int ret;
1431 
1432         if (!netif_running(dev->net)) {
1433                 /* interface is ifconfig down so fully power down hw */
1434                 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1435                 return smsc95xx_enter_suspend2(dev);
1436         }
1437 
1438         if (!link_up) {
1439                 /* link is down so enter EDPD mode, but only if device can
1440                  * reliably resume from it.  This check should be redundant
1441                  * as current FEATURE_REMOTE_WAKEUP parts also support
1442                  * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1443                 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1444                         netdev_warn(dev->net, "EDPD not supported\n");
1445                         return -EBUSY;
1446                 }
1447 
1448                 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1449 
1450                 /* enable PHY wakeup events for if cable is attached */
1451                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1452                         PHY_INT_MASK_ANEG_COMP_);
1453                 if (ret < 0) {
1454                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1455                         return ret;
1456                 }
1457 
1458                 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1459                 return smsc95xx_enter_suspend1(dev);
1460         }
1461 
1462         /* enable PHY wakeup events so we remote wakeup if cable is pulled */
1463         ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1464                 PHY_INT_MASK_LINK_DOWN_);
1465         if (ret < 0) {
1466                 netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1467                 return ret;
1468         }
1469 
1470         netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1471         return smsc95xx_enter_suspend3(dev);
1472 }
1473 
1474 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1475 {
1476         struct usbnet *dev = usb_get_intfdata(intf);
1477         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1478         u32 val, link_up;
1479         int ret;
1480 
1481         ret = usbnet_suspend(intf, message);
1482         if (ret < 0) {
1483                 netdev_warn(dev->net, "usbnet_suspend error\n");
1484                 return ret;
1485         }
1486 
1487         if (pdata->suspend_flags) {
1488                 netdev_warn(dev->net, "error during last resume\n");
1489                 pdata->suspend_flags = 0;
1490         }
1491 
1492         /* determine if link is up using only _nopm functions */
1493         link_up = smsc95xx_link_ok_nopm(dev);
1494 
1495         if (message.event == PM_EVENT_AUTO_SUSPEND &&
1496             (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1497                 ret = smsc95xx_autosuspend(dev, link_up);
1498                 goto done;
1499         }
1500 
1501         /* if we get this far we're not autosuspending */
1502         /* if no wol options set, or if link is down and we're not waking on
1503          * PHY activity, enter lowest power SUSPEND2 mode
1504          */
1505         if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1506                 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1507                 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1508 
1509                 /* disable energy detect (link up) & wake up events */
1510                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1511                 if (ret < 0)
1512                         goto done;
1513 
1514                 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1515 
1516                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1517                 if (ret < 0)
1518                         goto done;
1519 
1520                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1521                 if (ret < 0)
1522                         goto done;
1523 
1524                 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1525 
1526                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1527                 if (ret < 0)
1528                         goto done;
1529 
1530                 ret = smsc95xx_enter_suspend2(dev);
1531                 goto done;
1532         }
1533 
1534         if (pdata->wolopts & WAKE_PHY) {
1535                 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1536                         (PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
1537                 if (ret < 0) {
1538                         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1539                         goto done;
1540                 }
1541 
1542                 /* if link is down then configure EDPD and enter SUSPEND1,
1543                  * otherwise enter SUSPEND0 below
1544                  */
1545                 if (!link_up) {
1546                         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1547                         ret = smsc95xx_enter_suspend1(dev);
1548                         goto done;
1549                 }
1550         }
1551 
1552         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1553                 u32 *filter_mask = kzalloc(sizeof(u32) * 32, GFP_KERNEL);
1554                 u32 command[2];
1555                 u32 offset[2];
1556                 u32 crc[4];
1557                 int wuff_filter_count =
1558                         (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1559                         LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1560                 int i, filter = 0;
1561 
1562                 if (!filter_mask) {
1563                         netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1564                         ret = -ENOMEM;
1565                         goto done;
1566                 }
1567 
1568                 memset(command, 0, sizeof(command));
1569                 memset(offset, 0, sizeof(offset));
1570                 memset(crc, 0, sizeof(crc));
1571 
1572                 if (pdata->wolopts & WAKE_BCAST) {
1573                         const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1574                         netdev_info(dev->net, "enabling broadcast detection\n");
1575                         filter_mask[filter * 4] = 0x003F;
1576                         filter_mask[filter * 4 + 1] = 0x00;
1577                         filter_mask[filter * 4 + 2] = 0x00;
1578                         filter_mask[filter * 4 + 3] = 0x00;
1579                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1580                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1581                         crc[filter/2] |= smsc_crc(bcast, 6, filter);
1582                         filter++;
1583                 }
1584 
1585                 if (pdata->wolopts & WAKE_MCAST) {
1586                         const u8 mcast[] = {0x01, 0x00, 0x5E};
1587                         netdev_info(dev->net, "enabling multicast detection\n");
1588                         filter_mask[filter * 4] = 0x0007;
1589                         filter_mask[filter * 4 + 1] = 0x00;
1590                         filter_mask[filter * 4 + 2] = 0x00;
1591                         filter_mask[filter * 4 + 3] = 0x00;
1592                         command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1593                         offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1594                         crc[filter/2] |= smsc_crc(mcast, 3, filter);
1595                         filter++;
1596                 }
1597 
1598                 if (pdata->wolopts & WAKE_ARP) {
1599                         const u8 arp[] = {0x08, 0x06};
1600                         netdev_info(dev->net, "enabling ARP detection\n");
1601                         filter_mask[filter * 4] = 0x0003;
1602                         filter_mask[filter * 4 + 1] = 0x00;
1603                         filter_mask[filter * 4 + 2] = 0x00;
1604                         filter_mask[filter * 4 + 3] = 0x00;
1605                         command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1606                         offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1607                         crc[filter/2] |= smsc_crc(arp, 2, filter);
1608                         filter++;
1609                 }
1610 
1611                 if (pdata->wolopts & WAKE_UCAST) {
1612                         netdev_info(dev->net, "enabling unicast detection\n");
1613                         filter_mask[filter * 4] = 0x003F;
1614                         filter_mask[filter * 4 + 1] = 0x00;
1615                         filter_mask[filter * 4 + 2] = 0x00;
1616                         filter_mask[filter * 4 + 3] = 0x00;
1617                         command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1618                         offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1619                         crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1620                         filter++;
1621                 }
1622 
1623                 for (i = 0; i < (wuff_filter_count * 4); i++) {
1624                         ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
1625                         if (ret < 0) {
1626                                 kfree(filter_mask);
1627                                 goto done;
1628                         }
1629                 }
1630                 kfree(filter_mask);
1631 
1632                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1633                         ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
1634                         if (ret < 0)
1635                                 goto done;
1636                 }
1637 
1638                 for (i = 0; i < (wuff_filter_count / 4); i++) {
1639                         ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
1640                         if (ret < 0)
1641                                 goto done;
1642                 }
1643 
1644                 for (i = 0; i < (wuff_filter_count / 2); i++) {
1645                         ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
1646                         if (ret < 0)
1647                                 goto done;
1648                 }
1649 
1650                 /* clear any pending pattern match packet status */
1651                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1652                 if (ret < 0)
1653                         goto done;
1654 
1655                 val |= WUCSR_WUFR_;
1656 
1657                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1658                 if (ret < 0)
1659                         goto done;
1660         }
1661 
1662         if (pdata->wolopts & WAKE_MAGIC) {
1663                 /* clear any pending magic packet status */
1664                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1665                 if (ret < 0)
1666                         goto done;
1667 
1668                 val |= WUCSR_MPR_;
1669 
1670                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1671                 if (ret < 0)
1672                         goto done;
1673         }
1674 
1675         /* enable/disable wakeup sources */
1676         ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1677         if (ret < 0)
1678                 goto done;
1679 
1680         if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1681                 netdev_info(dev->net, "enabling pattern match wakeup\n");
1682                 val |= WUCSR_WAKE_EN_;
1683         } else {
1684                 netdev_info(dev->net, "disabling pattern match wakeup\n");
1685                 val &= ~WUCSR_WAKE_EN_;
1686         }
1687 
1688         if (pdata->wolopts & WAKE_MAGIC) {
1689                 netdev_info(dev->net, "enabling magic packet wakeup\n");
1690                 val |= WUCSR_MPEN_;
1691         } else {
1692                 netdev_info(dev->net, "disabling magic packet wakeup\n");
1693                 val &= ~WUCSR_MPEN_;
1694         }
1695 
1696         ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1697         if (ret < 0)
1698                 goto done;
1699 
1700         /* enable wol wakeup source */
1701         ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1702         if (ret < 0)
1703                 goto done;
1704 
1705         val |= PM_CTL_WOL_EN_;
1706 
1707         /* phy energy detect wakeup source */
1708         if (pdata->wolopts & WAKE_PHY)
1709                 val |= PM_CTL_ED_EN_;
1710 
1711         ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1712         if (ret < 0)
1713                 goto done;
1714 
1715         /* enable receiver to enable frame reception */
1716         smsc95xx_start_rx_path(dev, 1);
1717 
1718         /* some wol options are enabled, so enter SUSPEND0 */
1719         netdev_info(dev->net, "entering SUSPEND0 mode\n");
1720         ret = smsc95xx_enter_suspend0(dev);
1721 
1722 done:
1723         /*
1724          * TODO: resume() might need to handle the suspend failure
1725          * in system sleep
1726          */
1727         if (ret && PMSG_IS_AUTO(message))
1728                 usbnet_resume(intf);
1729         return ret;
1730 }
1731 
1732 static int smsc95xx_resume(struct usb_interface *intf)
1733 {
1734         struct usbnet *dev = usb_get_intfdata(intf);
1735         struct smsc95xx_priv *pdata;
1736         u8 suspend_flags;
1737         int ret;
1738         u32 val;
1739 
1740         BUG_ON(!dev);
1741         pdata = (struct smsc95xx_priv *)(dev->data[0]);
1742         suspend_flags = pdata->suspend_flags;
1743 
1744         netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1745 
1746         /* do this first to ensure it's cleared even in error case */
1747         pdata->suspend_flags = 0;
1748         schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
1749 
1750         if (suspend_flags & SUSPEND_ALLMODES) {
1751                 /* clear wake-up sources */
1752                 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1753                 if (ret < 0)
1754                         return ret;
1755 
1756                 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1757 
1758                 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1759                 if (ret < 0)
1760                         return ret;
1761 
1762                 /* clear wake-up status */
1763                 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1764                 if (ret < 0)
1765                         return ret;
1766 
1767                 val &= ~PM_CTL_WOL_EN_;
1768                 val |= PM_CTL_WUPS_;
1769 
1770                 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1771                 if (ret < 0)
1772                         return ret;
1773         }
1774 
1775         ret = usbnet_resume(intf);
1776         if (ret < 0)
1777                 netdev_warn(dev->net, "usbnet_resume error\n");
1778 
1779         return ret;
1780 }
1781 
1782 static int smsc95xx_reset_resume(struct usb_interface *intf)
1783 {
1784         struct usbnet *dev = usb_get_intfdata(intf);
1785         int ret;
1786 
1787         ret = smsc95xx_reset(dev);
1788         if (ret < 0)
1789                 return ret;
1790 
1791         return smsc95xx_resume(intf);
1792 }
1793 
1794 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1795 {
1796         skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1797         skb->ip_summed = CHECKSUM_COMPLETE;
1798         skb_trim(skb, skb->len - 2);
1799 }
1800 
1801 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1802 {
1803         /* This check is no longer done by usbnet */
1804         if (skb->len < dev->net->hard_header_len)
1805                 return 0;
1806 
1807         while (skb->len > 0) {
1808                 u32 header, align_count;
1809                 struct sk_buff *ax_skb;
1810                 unsigned char *packet;
1811                 u16 size;
1812 
1813                 memcpy(&header, skb->data, sizeof(header));
1814                 le32_to_cpus(&header);
1815                 skb_pull(skb, 4 + NET_IP_ALIGN);
1816                 packet = skb->data;
1817 
1818                 /* get the packet length */
1819                 size = (u16)((header & RX_STS_FL_) >> 16);
1820                 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1821 
1822                 if (unlikely(header & RX_STS_ES_)) {
1823                         netif_dbg(dev, rx_err, dev->net,
1824                                   "Error header=0x%08x\n", header);
1825                         dev->net->stats.rx_errors++;
1826                         dev->net->stats.rx_dropped++;
1827 
1828                         if (header & RX_STS_CRC_) {
1829                                 dev->net->stats.rx_crc_errors++;
1830                         } else {
1831                                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1832                                         dev->net->stats.rx_frame_errors++;
1833 
1834                                 if ((header & RX_STS_LE_) &&
1835                                         (!(header & RX_STS_FT_)))
1836                                         dev->net->stats.rx_length_errors++;
1837                         }
1838                 } else {
1839                         /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1840                         if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1841                                 netif_dbg(dev, rx_err, dev->net,
1842                                           "size err header=0x%08x\n", header);
1843                                 return 0;
1844                         }
1845 
1846                         /* last frame in this batch */
1847                         if (skb->len == size) {
1848                                 if (dev->net->features & NETIF_F_RXCSUM)
1849                                         smsc95xx_rx_csum_offload(skb);
1850                                 skb_trim(skb, skb->len - 4); /* remove fcs */
1851                                 skb->truesize = size + sizeof(struct sk_buff);
1852 
1853                                 return 1;
1854                         }
1855 
1856                         ax_skb = skb_clone(skb, GFP_ATOMIC);
1857                         if (unlikely(!ax_skb)) {
1858                                 netdev_warn(dev->net, "Error allocating skb\n");
1859                                 return 0;
1860                         }
1861 
1862                         ax_skb->len = size;
1863                         ax_skb->data = packet;
1864                         skb_set_tail_pointer(ax_skb, size);
1865 
1866                         if (dev->net->features & NETIF_F_RXCSUM)
1867                                 smsc95xx_rx_csum_offload(ax_skb);
1868                         skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1869                         ax_skb->truesize = size + sizeof(struct sk_buff);
1870 
1871                         usbnet_skb_return(dev, ax_skb);
1872                 }
1873 
1874                 skb_pull(skb, size);
1875 
1876                 /* padding bytes before the next frame starts */
1877                 if (skb->len)
1878                         skb_pull(skb, align_count);
1879         }
1880 
1881         return 1;
1882 }
1883 
1884 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1885 {
1886         u16 low_16 = (u16)skb_checksum_start_offset(skb);
1887         u16 high_16 = low_16 + skb->csum_offset;
1888         return (high_16 << 16) | low_16;
1889 }
1890 
1891 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1892                                          struct sk_buff *skb, gfp_t flags)
1893 {
1894         bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1895         int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1896         u32 tx_cmd_a, tx_cmd_b;
1897 
1898         /* We do not advertise SG, so skbs should be already linearized */
1899         BUG_ON(skb_shinfo(skb)->nr_frags);
1900 
1901         if (skb_headroom(skb) < overhead) {
1902                 struct sk_buff *skb2 = skb_copy_expand(skb,
1903                         overhead, 0, flags);
1904                 dev_kfree_skb_any(skb);
1905                 skb = skb2;
1906                 if (!skb)
1907                         return NULL;
1908         }
1909 
1910         if (csum) {
1911                 if (skb->len <= 45) {
1912                         /* workaround - hardware tx checksum does not work
1913                          * properly with extremely small packets */
1914                         long csstart = skb_checksum_start_offset(skb);
1915                         __wsum calc = csum_partial(skb->data + csstart,
1916                                 skb->len - csstart, 0);
1917                         *((__sum16 *)(skb->data + csstart
1918                                 + skb->csum_offset)) = csum_fold(calc);
1919 
1920                         csum = false;
1921                 } else {
1922                         u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1923                         skb_push(skb, 4);
1924                         cpu_to_le32s(&csum_preamble);
1925                         memcpy(skb->data, &csum_preamble, 4);
1926                 }
1927         }
1928 
1929         skb_push(skb, 4);
1930         tx_cmd_b = (u32)(skb->len - 4);
1931         if (csum)
1932                 tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1933         cpu_to_le32s(&tx_cmd_b);
1934         memcpy(skb->data, &tx_cmd_b, 4);
1935 
1936         skb_push(skb, 4);
1937         tx_cmd_a = (u32)(skb->len - 8) | TX_CMD_A_FIRST_SEG_ |
1938                 TX_CMD_A_LAST_SEG_;
1939         cpu_to_le32s(&tx_cmd_a);
1940         memcpy(skb->data, &tx_cmd_a, 4);
1941 
1942         return skb;
1943 }
1944 
1945 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1946 {
1947         struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1948 
1949         dev->intf->needs_remote_wakeup = on;
1950 
1951         if (pdata->features & FEATURE_REMOTE_WAKEUP)
1952                 return 0;
1953 
1954         /* this chip revision isn't capable of remote wakeup */
1955         netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1956 
1957         if (on)
1958                 usb_autopm_get_interface_no_resume(dev->intf);
1959         else
1960                 usb_autopm_put_interface(dev->intf);
1961 
1962         return 0;
1963 }
1964 
1965 static const struct driver_info smsc95xx_info = {
1966         .description    = "smsc95xx USB 2.0 Ethernet",
1967         .bind           = smsc95xx_bind,
1968         .unbind         = smsc95xx_unbind,
1969         .link_reset     = smsc95xx_link_reset,
1970         .reset          = smsc95xx_reset,
1971         .rx_fixup       = smsc95xx_rx_fixup,
1972         .tx_fixup       = smsc95xx_tx_fixup,
1973         .status         = smsc95xx_status,
1974         .manage_power   = smsc95xx_manage_power,
1975         .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
1976 };
1977 
1978 static const struct usb_device_id products[] = {
1979         {
1980                 /* SMSC9500 USB Ethernet Device */
1981                 USB_DEVICE(0x0424, 0x9500),
1982                 .driver_info = (unsigned long) &smsc95xx_info,
1983         },
1984         {
1985                 /* SMSC9505 USB Ethernet Device */
1986                 USB_DEVICE(0x0424, 0x9505),
1987                 .driver_info = (unsigned long) &smsc95xx_info,
1988         },
1989         {
1990                 /* SMSC9500A USB Ethernet Device */
1991                 USB_DEVICE(0x0424, 0x9E00),
1992                 .driver_info = (unsigned long) &smsc95xx_info,
1993         },
1994         {
1995                 /* SMSC9505A USB Ethernet Device */
1996                 USB_DEVICE(0x0424, 0x9E01),
1997                 .driver_info = (unsigned long) &smsc95xx_info,
1998         },
1999         {
2000                 /* SMSC9512/9514 USB Hub & Ethernet Device */
2001                 USB_DEVICE(0x0424, 0xec00),
2002                 .driver_info = (unsigned long) &smsc95xx_info,
2003         },
2004         {
2005                 /* SMSC9500 USB Ethernet Device (SAL10) */
2006                 USB_DEVICE(0x0424, 0x9900),
2007                 .driver_info = (unsigned long) &smsc95xx_info,
2008         },
2009         {
2010                 /* SMSC9505 USB Ethernet Device (SAL10) */
2011                 USB_DEVICE(0x0424, 0x9901),
2012                 .driver_info = (unsigned long) &smsc95xx_info,
2013         },
2014         {
2015                 /* SMSC9500A USB Ethernet Device (SAL10) */
2016                 USB_DEVICE(0x0424, 0x9902),
2017                 .driver_info = (unsigned long) &smsc95xx_info,
2018         },
2019         {
2020                 /* SMSC9505A USB Ethernet Device (SAL10) */
2021                 USB_DEVICE(0x0424, 0x9903),
2022                 .driver_info = (unsigned long) &smsc95xx_info,
2023         },
2024         {
2025                 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2026                 USB_DEVICE(0x0424, 0x9904),
2027                 .driver_info = (unsigned long) &smsc95xx_info,
2028         },
2029         {
2030                 /* SMSC9500A USB Ethernet Device (HAL) */
2031                 USB_DEVICE(0x0424, 0x9905),
2032                 .driver_info = (unsigned long) &smsc95xx_info,
2033         },
2034         {
2035                 /* SMSC9505A USB Ethernet Device (HAL) */
2036                 USB_DEVICE(0x0424, 0x9906),
2037                 .driver_info = (unsigned long) &smsc95xx_info,
2038         },
2039         {
2040                 /* SMSC9500 USB Ethernet Device (Alternate ID) */
2041                 USB_DEVICE(0x0424, 0x9907),
2042                 .driver_info = (unsigned long) &smsc95xx_info,
2043         },
2044         {
2045                 /* SMSC9500A USB Ethernet Device (Alternate ID) */
2046                 USB_DEVICE(0x0424, 0x9908),
2047                 .driver_info = (unsigned long) &smsc95xx_info,
2048         },
2049         {
2050                 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2051                 USB_DEVICE(0x0424, 0x9909),
2052                 .driver_info = (unsigned long) &smsc95xx_info,
2053         },
2054         {
2055                 /* SMSC LAN9530 USB Ethernet Device */
2056                 USB_DEVICE(0x0424, 0x9530),
2057                 .driver_info = (unsigned long) &smsc95xx_info,
2058         },
2059         {
2060                 /* SMSC LAN9730 USB Ethernet Device */
2061                 USB_DEVICE(0x0424, 0x9730),
2062                 .driver_info = (unsigned long) &smsc95xx_info,
2063         },
2064         {
2065                 /* SMSC LAN89530 USB Ethernet Device */
2066                 USB_DEVICE(0x0424, 0x9E08),
2067                 .driver_info = (unsigned long) &smsc95xx_info,
2068         },
2069         { },            /* END */
2070 };
2071 MODULE_DEVICE_TABLE(usb, products);
2072 
2073 static struct usb_driver smsc95xx_driver = {
2074         .name           = "smsc95xx",
2075         .id_table       = products,
2076         .probe          = usbnet_probe,
2077         .suspend        = smsc95xx_suspend,
2078         .resume         = smsc95xx_resume,
2079         .reset_resume   = smsc95xx_reset_resume,
2080         .disconnect     = usbnet_disconnect,
2081         .disable_hub_initiated_lpm = 1,
2082         .supports_autosuspend = 1,
2083 };
2084 
2085 module_usb_driver(smsc95xx_driver);
2086 
2087 MODULE_AUTHOR("Nancy Lin");
2088 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2089 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2090 MODULE_LICENSE("GPL");
2091 

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