xref: /openbmc/linux/drivers/net/usb/smsc95xx.c (revision f97769fd)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2  /***************************************************************************
3  *
4  * Copyright (C) 2007-2008 SMSC
5  *
6  *****************************************************************************/
7 
8 #include <linux/module.h>
9 #include <linux/kmod.h>
10 #include <linux/netdevice.h>
11 #include <linux/etherdevice.h>
12 #include <linux/ethtool.h>
13 #include <linux/mii.h>
14 #include <linux/usb.h>
15 #include <linux/bitrev.h>
16 #include <linux/crc16.h>
17 #include <linux/crc32.h>
18 #include <linux/usb/usbnet.h>
19 #include <linux/slab.h>
20 #include <linux/of_net.h>
21 #include "smsc95xx.h"
22 
23 #define SMSC_CHIPNAME			"smsc95xx"
24 #define SMSC_DRIVER_VERSION		"1.0.6"
25 #define HS_USB_PKT_SIZE			(512)
26 #define FS_USB_PKT_SIZE			(64)
27 #define DEFAULT_HS_BURST_CAP_SIZE	(16 * 1024 + 5 * HS_USB_PKT_SIZE)
28 #define DEFAULT_FS_BURST_CAP_SIZE	(6 * 1024 + 33 * FS_USB_PKT_SIZE)
29 #define DEFAULT_BULK_IN_DELAY		(0x00002000)
30 #define MAX_SINGLE_PACKET_SIZE		(2048)
31 #define LAN95XX_EEPROM_MAGIC		(0x9500)
32 #define EEPROM_MAC_OFFSET		(0x01)
33 #define DEFAULT_TX_CSUM_ENABLE		(true)
34 #define DEFAULT_RX_CSUM_ENABLE		(true)
35 #define SMSC95XX_INTERNAL_PHY_ID	(1)
36 #define SMSC95XX_TX_OVERHEAD		(8)
37 #define SMSC95XX_TX_OVERHEAD_CSUM	(12)
38 #define SUPPORTED_WAKE			(WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
39 					 WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
40 
41 #define FEATURE_8_WAKEUP_FILTERS	(0x01)
42 #define FEATURE_PHY_NLP_CROSSOVER	(0x02)
43 #define FEATURE_REMOTE_WAKEUP		(0x04)
44 
45 #define SUSPEND_SUSPEND0		(0x01)
46 #define SUSPEND_SUSPEND1		(0x02)
47 #define SUSPEND_SUSPEND2		(0x04)
48 #define SUSPEND_SUSPEND3		(0x08)
49 #define SUSPEND_ALLMODES		(SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
50 					 SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
51 
52 #define CARRIER_CHECK_DELAY (2 * HZ)
53 
54 struct smsc95xx_priv {
55 	u32 chip_id;
56 	u32 mac_cr;
57 	u32 hash_hi;
58 	u32 hash_lo;
59 	u32 wolopts;
60 	spinlock_t mac_cr_lock;
61 	u8 features;
62 	u8 suspend_flags;
63 	u8 mdix_ctrl;
64 	bool link_ok;
65 	struct delayed_work carrier_check;
66 	struct usbnet *dev;
67 };
68 
69 static bool turbo_mode = true;
70 module_param(turbo_mode, bool, 0644);
71 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
72 
73 static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
74 					    u32 *data, int in_pm)
75 {
76 	u32 buf;
77 	int ret;
78 	int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
79 
80 	BUG_ON(!dev);
81 
82 	if (!in_pm)
83 		fn = usbnet_read_cmd;
84 	else
85 		fn = usbnet_read_cmd_nopm;
86 
87 	ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
88 		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
89 		 0, index, &buf, 4);
90 	if (unlikely(ret < 0)) {
91 		netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
92 			    index, ret);
93 		return ret;
94 	}
95 
96 	le32_to_cpus(&buf);
97 	*data = buf;
98 
99 	return ret;
100 }
101 
102 static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
103 					     u32 data, int in_pm)
104 {
105 	u32 buf;
106 	int ret;
107 	int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
108 
109 	BUG_ON(!dev);
110 
111 	if (!in_pm)
112 		fn = usbnet_write_cmd;
113 	else
114 		fn = usbnet_write_cmd_nopm;
115 
116 	buf = data;
117 	cpu_to_le32s(&buf);
118 
119 	ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
120 		 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
121 		 0, index, &buf, 4);
122 	if (unlikely(ret < 0))
123 		netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
124 			    index, ret);
125 
126 	return ret;
127 }
128 
129 static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
130 					       u32 *data)
131 {
132 	return __smsc95xx_read_reg(dev, index, data, 1);
133 }
134 
135 static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
136 						u32 data)
137 {
138 	return __smsc95xx_write_reg(dev, index, data, 1);
139 }
140 
141 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
142 					  u32 *data)
143 {
144 	return __smsc95xx_read_reg(dev, index, data, 0);
145 }
146 
147 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
148 					   u32 data)
149 {
150 	return __smsc95xx_write_reg(dev, index, data, 0);
151 }
152 
153 /* Loop until the read is completed with timeout
154  * called with phy_mutex held */
155 static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
156 						     int in_pm)
157 {
158 	unsigned long start_time = jiffies;
159 	u32 val;
160 	int ret;
161 
162 	do {
163 		ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
164 		if (ret < 0) {
165 			netdev_warn(dev->net, "Error reading MII_ACCESS\n");
166 			return ret;
167 		}
168 
169 		if (!(val & MII_BUSY_))
170 			return 0;
171 	} while (!time_after(jiffies, start_time + HZ));
172 
173 	return -EIO;
174 }
175 
176 static int __smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx,
177 				int in_pm)
178 {
179 	struct usbnet *dev = netdev_priv(netdev);
180 	u32 val, addr;
181 	int ret;
182 
183 	mutex_lock(&dev->phy_mutex);
184 
185 	/* confirm MII not busy */
186 	ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
187 	if (ret < 0) {
188 		netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_read\n");
189 		goto done;
190 	}
191 
192 	/* set the address, index & direction (read from PHY) */
193 	phy_id &= dev->mii.phy_id_mask;
194 	idx &= dev->mii.reg_num_mask;
195 	addr = (phy_id << 11) | (idx << 6) | MII_READ_ | MII_BUSY_;
196 	ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
197 	if (ret < 0) {
198 		netdev_warn(dev->net, "Error writing MII_ADDR\n");
199 		goto done;
200 	}
201 
202 	ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
203 	if (ret < 0) {
204 		netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
205 		goto done;
206 	}
207 
208 	ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
209 	if (ret < 0) {
210 		netdev_warn(dev->net, "Error reading MII_DATA\n");
211 		goto done;
212 	}
213 
214 	ret = (u16)(val & 0xFFFF);
215 
216 done:
217 	mutex_unlock(&dev->phy_mutex);
218 	return ret;
219 }
220 
221 static void __smsc95xx_mdio_write(struct net_device *netdev, int phy_id,
222 				  int idx, int regval, int in_pm)
223 {
224 	struct usbnet *dev = netdev_priv(netdev);
225 	u32 val, addr;
226 	int ret;
227 
228 	mutex_lock(&dev->phy_mutex);
229 
230 	/* confirm MII not busy */
231 	ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
232 	if (ret < 0) {
233 		netdev_warn(dev->net, "MII is busy in smsc95xx_mdio_write\n");
234 		goto done;
235 	}
236 
237 	val = regval;
238 	ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
239 	if (ret < 0) {
240 		netdev_warn(dev->net, "Error writing MII_DATA\n");
241 		goto done;
242 	}
243 
244 	/* set the address, index & direction (write to PHY) */
245 	phy_id &= dev->mii.phy_id_mask;
246 	idx &= dev->mii.reg_num_mask;
247 	addr = (phy_id << 11) | (idx << 6) | MII_WRITE_ | MII_BUSY_;
248 	ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
249 	if (ret < 0) {
250 		netdev_warn(dev->net, "Error writing MII_ADDR\n");
251 		goto done;
252 	}
253 
254 	ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
255 	if (ret < 0) {
256 		netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
257 		goto done;
258 	}
259 
260 done:
261 	mutex_unlock(&dev->phy_mutex);
262 }
263 
264 static int smsc95xx_mdio_read_nopm(struct net_device *netdev, int phy_id,
265 				   int idx)
266 {
267 	return __smsc95xx_mdio_read(netdev, phy_id, idx, 1);
268 }
269 
270 static void smsc95xx_mdio_write_nopm(struct net_device *netdev, int phy_id,
271 				     int idx, int regval)
272 {
273 	__smsc95xx_mdio_write(netdev, phy_id, idx, regval, 1);
274 }
275 
276 static int smsc95xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
277 {
278 	return __smsc95xx_mdio_read(netdev, phy_id, idx, 0);
279 }
280 
281 static void smsc95xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
282 				int regval)
283 {
284 	__smsc95xx_mdio_write(netdev, phy_id, idx, regval, 0);
285 }
286 
287 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
288 {
289 	unsigned long start_time = jiffies;
290 	u32 val;
291 	int ret;
292 
293 	do {
294 		ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
295 		if (ret < 0) {
296 			netdev_warn(dev->net, "Error reading E2P_CMD\n");
297 			return ret;
298 		}
299 
300 		if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
301 			break;
302 		udelay(40);
303 	} while (!time_after(jiffies, start_time + HZ));
304 
305 	if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
306 		netdev_warn(dev->net, "EEPROM read operation timeout\n");
307 		return -EIO;
308 	}
309 
310 	return 0;
311 }
312 
313 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
314 {
315 	unsigned long start_time = jiffies;
316 	u32 val;
317 	int ret;
318 
319 	do {
320 		ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
321 		if (ret < 0) {
322 			netdev_warn(dev->net, "Error reading E2P_CMD\n");
323 			return ret;
324 		}
325 
326 		if (!(val & E2P_CMD_BUSY_))
327 			return 0;
328 
329 		udelay(40);
330 	} while (!time_after(jiffies, start_time + HZ));
331 
332 	netdev_warn(dev->net, "EEPROM is busy\n");
333 	return -EIO;
334 }
335 
336 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
337 				u8 *data)
338 {
339 	u32 val;
340 	int i, ret;
341 
342 	BUG_ON(!dev);
343 	BUG_ON(!data);
344 
345 	ret = smsc95xx_eeprom_confirm_not_busy(dev);
346 	if (ret)
347 		return ret;
348 
349 	for (i = 0; i < length; i++) {
350 		val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
351 		ret = smsc95xx_write_reg(dev, E2P_CMD, val);
352 		if (ret < 0) {
353 			netdev_warn(dev->net, "Error writing E2P_CMD\n");
354 			return ret;
355 		}
356 
357 		ret = smsc95xx_wait_eeprom(dev);
358 		if (ret < 0)
359 			return ret;
360 
361 		ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
362 		if (ret < 0) {
363 			netdev_warn(dev->net, "Error reading E2P_DATA\n");
364 			return ret;
365 		}
366 
367 		data[i] = val & 0xFF;
368 		offset++;
369 	}
370 
371 	return 0;
372 }
373 
374 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
375 				 u8 *data)
376 {
377 	u32 val;
378 	int i, ret;
379 
380 	BUG_ON(!dev);
381 	BUG_ON(!data);
382 
383 	ret = smsc95xx_eeprom_confirm_not_busy(dev);
384 	if (ret)
385 		return ret;
386 
387 	/* Issue write/erase enable command */
388 	val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
389 	ret = smsc95xx_write_reg(dev, E2P_CMD, val);
390 	if (ret < 0) {
391 		netdev_warn(dev->net, "Error writing E2P_DATA\n");
392 		return ret;
393 	}
394 
395 	ret = smsc95xx_wait_eeprom(dev);
396 	if (ret < 0)
397 		return ret;
398 
399 	for (i = 0; i < length; i++) {
400 
401 		/* Fill data register */
402 		val = data[i];
403 		ret = smsc95xx_write_reg(dev, E2P_DATA, val);
404 		if (ret < 0) {
405 			netdev_warn(dev->net, "Error writing E2P_DATA\n");
406 			return ret;
407 		}
408 
409 		/* Send "write" command */
410 		val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
411 		ret = smsc95xx_write_reg(dev, E2P_CMD, val);
412 		if (ret < 0) {
413 			netdev_warn(dev->net, "Error writing E2P_CMD\n");
414 			return ret;
415 		}
416 
417 		ret = smsc95xx_wait_eeprom(dev);
418 		if (ret < 0)
419 			return ret;
420 
421 		offset++;
422 	}
423 
424 	return 0;
425 }
426 
427 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
428 						 u32 data)
429 {
430 	const u16 size = 4;
431 	u32 buf;
432 	int ret;
433 
434 	buf = data;
435 	cpu_to_le32s(&buf);
436 
437 	ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
438 				     USB_DIR_OUT | USB_TYPE_VENDOR |
439 				     USB_RECIP_DEVICE,
440 				     0, index, &buf, size);
441 	if (ret < 0)
442 		netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
443 			    ret);
444 	return ret;
445 }
446 
447 /* returns hash bit number for given MAC address
448  * example:
449  * 01 00 5E 00 00 01 -> returns bit number 31 */
450 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
451 {
452 	return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
453 }
454 
455 static void smsc95xx_set_multicast(struct net_device *netdev)
456 {
457 	struct usbnet *dev = netdev_priv(netdev);
458 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
459 	unsigned long flags;
460 	int ret;
461 
462 	pdata->hash_hi = 0;
463 	pdata->hash_lo = 0;
464 
465 	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
466 
467 	if (dev->net->flags & IFF_PROMISC) {
468 		netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
469 		pdata->mac_cr |= MAC_CR_PRMS_;
470 		pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
471 	} else if (dev->net->flags & IFF_ALLMULTI) {
472 		netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
473 		pdata->mac_cr |= MAC_CR_MCPAS_;
474 		pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
475 	} else if (!netdev_mc_empty(dev->net)) {
476 		struct netdev_hw_addr *ha;
477 
478 		pdata->mac_cr |= MAC_CR_HPFILT_;
479 		pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
480 
481 		netdev_for_each_mc_addr(ha, netdev) {
482 			u32 bitnum = smsc95xx_hash(ha->addr);
483 			u32 mask = 0x01 << (bitnum & 0x1F);
484 			if (bitnum & 0x20)
485 				pdata->hash_hi |= mask;
486 			else
487 				pdata->hash_lo |= mask;
488 		}
489 
490 		netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
491 				   pdata->hash_hi, pdata->hash_lo);
492 	} else {
493 		netif_dbg(dev, drv, dev->net, "receive own packets only\n");
494 		pdata->mac_cr &=
495 			~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
496 	}
497 
498 	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
499 
500 	/* Initiate async writes, as we can't wait for completion here */
501 	ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
502 	if (ret < 0)
503 		netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
504 
505 	ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
506 	if (ret < 0)
507 		netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
508 
509 	ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
510 	if (ret < 0)
511 		netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
512 }
513 
514 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev, u8 duplex,
515 					   u16 lcladv, u16 rmtadv)
516 {
517 	u32 flow = 0, afc_cfg;
518 
519 	int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
520 	if (ret < 0)
521 		return ret;
522 
523 	if (duplex == DUPLEX_FULL) {
524 		u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
525 
526 		if (cap & FLOW_CTRL_RX)
527 			flow = 0xFFFF0002;
528 
529 		if (cap & FLOW_CTRL_TX) {
530 			afc_cfg |= 0xF;
531 			flow |= 0xFFFF0000;
532 		} else {
533 			afc_cfg &= ~0xF;
534 		}
535 
536 		netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
537 				   cap & FLOW_CTRL_RX ? "enabled" : "disabled",
538 				   cap & FLOW_CTRL_TX ? "enabled" : "disabled");
539 	} else {
540 		netif_dbg(dev, link, dev->net, "half duplex\n");
541 		afc_cfg |= 0xF;
542 	}
543 
544 	ret = smsc95xx_write_reg(dev, FLOW, flow);
545 	if (ret < 0)
546 		return ret;
547 
548 	return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
549 }
550 
551 static int smsc95xx_link_reset(struct usbnet *dev)
552 {
553 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
554 	struct mii_if_info *mii = &dev->mii;
555 	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
556 	unsigned long flags;
557 	u16 lcladv, rmtadv;
558 	int ret;
559 
560 	/* clear interrupt status */
561 	ret = smsc95xx_mdio_read(dev->net, mii->phy_id, PHY_INT_SRC);
562 	if (ret < 0)
563 		return ret;
564 
565 	ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
566 	if (ret < 0)
567 		return ret;
568 
569 	mii_check_media(mii, 1, 1);
570 	mii_ethtool_gset(&dev->mii, &ecmd);
571 	lcladv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
572 	rmtadv = smsc95xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
573 
574 	netif_dbg(dev, link, dev->net,
575 		  "speed: %u duplex: %d lcladv: %04x rmtadv: %04x\n",
576 		  ethtool_cmd_speed(&ecmd), ecmd.duplex, lcladv, rmtadv);
577 
578 	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
579 	if (ecmd.duplex != DUPLEX_FULL) {
580 		pdata->mac_cr &= ~MAC_CR_FDPX_;
581 		pdata->mac_cr |= MAC_CR_RCVOWN_;
582 	} else {
583 		pdata->mac_cr &= ~MAC_CR_RCVOWN_;
584 		pdata->mac_cr |= MAC_CR_FDPX_;
585 	}
586 	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
587 
588 	ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
589 	if (ret < 0)
590 		return ret;
591 
592 	ret = smsc95xx_phy_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
593 	if (ret < 0)
594 		netdev_warn(dev->net, "Error updating PHY flow control\n");
595 
596 	return ret;
597 }
598 
599 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
600 {
601 	u32 intdata;
602 
603 	if (urb->actual_length != 4) {
604 		netdev_warn(dev->net, "unexpected urb length %d\n",
605 			    urb->actual_length);
606 		return;
607 	}
608 
609 	intdata = get_unaligned_le32(urb->transfer_buffer);
610 	netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
611 
612 	if (intdata & INT_ENP_PHY_INT_)
613 		usbnet_defer_kevent(dev, EVENT_LINK_RESET);
614 	else
615 		netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
616 			    intdata);
617 }
618 
619 static void set_carrier(struct usbnet *dev, bool link)
620 {
621 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
622 
623 	if (pdata->link_ok == link)
624 		return;
625 
626 	pdata->link_ok = link;
627 
628 	if (link)
629 		usbnet_link_change(dev, 1, 0);
630 	else
631 		usbnet_link_change(dev, 0, 0);
632 }
633 
634 static void check_carrier(struct work_struct *work)
635 {
636 	struct smsc95xx_priv *pdata = container_of(work, struct smsc95xx_priv,
637 						carrier_check.work);
638 	struct usbnet *dev = pdata->dev;
639 	int ret;
640 
641 	if (pdata->suspend_flags != 0)
642 		return;
643 
644 	ret = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMSR);
645 	if (ret < 0) {
646 		netdev_warn(dev->net, "Failed to read MII_BMSR\n");
647 		return;
648 	}
649 	if (ret & BMSR_LSTATUS)
650 		set_carrier(dev, 1);
651 	else
652 		set_carrier(dev, 0);
653 
654 	schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
655 }
656 
657 /* Enable or disable Tx & Rx checksum offload engines */
658 static int smsc95xx_set_features(struct net_device *netdev,
659 	netdev_features_t features)
660 {
661 	struct usbnet *dev = netdev_priv(netdev);
662 	u32 read_buf;
663 	int ret;
664 
665 	ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
666 	if (ret < 0)
667 		return ret;
668 
669 	if (features & NETIF_F_IP_CSUM)
670 		read_buf |= Tx_COE_EN_;
671 	else
672 		read_buf &= ~Tx_COE_EN_;
673 
674 	if (features & NETIF_F_RXCSUM)
675 		read_buf |= Rx_COE_EN_;
676 	else
677 		read_buf &= ~Rx_COE_EN_;
678 
679 	ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
680 	if (ret < 0)
681 		return ret;
682 
683 	netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
684 	return 0;
685 }
686 
687 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
688 {
689 	return MAX_EEPROM_SIZE;
690 }
691 
692 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
693 				       struct ethtool_eeprom *ee, u8 *data)
694 {
695 	struct usbnet *dev = netdev_priv(netdev);
696 
697 	ee->magic = LAN95XX_EEPROM_MAGIC;
698 
699 	return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
700 }
701 
702 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
703 				       struct ethtool_eeprom *ee, u8 *data)
704 {
705 	struct usbnet *dev = netdev_priv(netdev);
706 
707 	if (ee->magic != LAN95XX_EEPROM_MAGIC) {
708 		netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
709 			    ee->magic);
710 		return -EINVAL;
711 	}
712 
713 	return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
714 }
715 
716 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
717 {
718 	/* all smsc95xx registers */
719 	return COE_CR - ID_REV + sizeof(u32);
720 }
721 
722 static void
723 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
724 			 void *buf)
725 {
726 	struct usbnet *dev = netdev_priv(netdev);
727 	unsigned int i, j;
728 	int retval;
729 	u32 *data = buf;
730 
731 	retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
732 	if (retval < 0) {
733 		netdev_warn(netdev, "REGS: cannot read ID_REV\n");
734 		return;
735 	}
736 
737 	for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
738 		retval = smsc95xx_read_reg(dev, i, &data[j]);
739 		if (retval < 0) {
740 			netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
741 			return;
742 		}
743 	}
744 }
745 
746 static void smsc95xx_ethtool_get_wol(struct net_device *net,
747 				     struct ethtool_wolinfo *wolinfo)
748 {
749 	struct usbnet *dev = netdev_priv(net);
750 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
751 
752 	wolinfo->supported = SUPPORTED_WAKE;
753 	wolinfo->wolopts = pdata->wolopts;
754 }
755 
756 static int smsc95xx_ethtool_set_wol(struct net_device *net,
757 				    struct ethtool_wolinfo *wolinfo)
758 {
759 	struct usbnet *dev = netdev_priv(net);
760 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
761 	int ret;
762 
763 	if (wolinfo->wolopts & ~SUPPORTED_WAKE)
764 		return -EINVAL;
765 
766 	pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
767 
768 	ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
769 	if (ret < 0)
770 		netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
771 
772 	return ret;
773 }
774 
775 static int get_mdix_status(struct net_device *net)
776 {
777 	struct usbnet *dev = netdev_priv(net);
778 	u32 val;
779 	int buf;
780 
781 	buf = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, SPECIAL_CTRL_STS);
782 	if (buf & SPECIAL_CTRL_STS_OVRRD_AMDIX_) {
783 		if (buf & SPECIAL_CTRL_STS_AMDIX_ENABLE_)
784 			return ETH_TP_MDI_AUTO;
785 		else if (buf & SPECIAL_CTRL_STS_AMDIX_STATE_)
786 			return ETH_TP_MDI_X;
787 	} else {
788 		buf = smsc95xx_read_reg(dev, STRAP_STATUS, &val);
789 		if (val & STRAP_STATUS_AMDIX_EN_)
790 			return ETH_TP_MDI_AUTO;
791 	}
792 
793 	return ETH_TP_MDI;
794 }
795 
796 static void set_mdix_status(struct net_device *net, __u8 mdix_ctrl)
797 {
798 	struct usbnet *dev = netdev_priv(net);
799 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
800 	int buf;
801 
802 	if ((pdata->chip_id == ID_REV_CHIP_ID_9500A_) ||
803 	    (pdata->chip_id == ID_REV_CHIP_ID_9530_) ||
804 	    (pdata->chip_id == ID_REV_CHIP_ID_89530_) ||
805 	    (pdata->chip_id == ID_REV_CHIP_ID_9730_)) {
806 		/* Extend Manual AutoMDIX timer for 9500A/9500Ai */
807 		buf = smsc95xx_mdio_read(dev->net, dev->mii.phy_id,
808 					 PHY_EDPD_CONFIG);
809 		buf |= PHY_EDPD_CONFIG_EXT_CROSSOVER_;
810 		smsc95xx_mdio_write(dev->net, dev->mii.phy_id,
811 				    PHY_EDPD_CONFIG, buf);
812 	}
813 
814 	if (mdix_ctrl == ETH_TP_MDI) {
815 		buf = smsc95xx_mdio_read(dev->net, dev->mii.phy_id,
816 					 SPECIAL_CTRL_STS);
817 		buf |= SPECIAL_CTRL_STS_OVRRD_AMDIX_;
818 		buf &= ~(SPECIAL_CTRL_STS_AMDIX_ENABLE_ |
819 			 SPECIAL_CTRL_STS_AMDIX_STATE_);
820 		smsc95xx_mdio_write(dev->net, dev->mii.phy_id,
821 				    SPECIAL_CTRL_STS, buf);
822 	} else if (mdix_ctrl == ETH_TP_MDI_X) {
823 		buf = smsc95xx_mdio_read(dev->net, dev->mii.phy_id,
824 					 SPECIAL_CTRL_STS);
825 		buf |= SPECIAL_CTRL_STS_OVRRD_AMDIX_;
826 		buf &= ~(SPECIAL_CTRL_STS_AMDIX_ENABLE_ |
827 			 SPECIAL_CTRL_STS_AMDIX_STATE_);
828 		buf |= SPECIAL_CTRL_STS_AMDIX_STATE_;
829 		smsc95xx_mdio_write(dev->net, dev->mii.phy_id,
830 				    SPECIAL_CTRL_STS, buf);
831 	} else if (mdix_ctrl == ETH_TP_MDI_AUTO) {
832 		buf = smsc95xx_mdio_read(dev->net, dev->mii.phy_id,
833 					 SPECIAL_CTRL_STS);
834 		buf &= ~SPECIAL_CTRL_STS_OVRRD_AMDIX_;
835 		buf &= ~(SPECIAL_CTRL_STS_AMDIX_ENABLE_ |
836 			 SPECIAL_CTRL_STS_AMDIX_STATE_);
837 		buf |= SPECIAL_CTRL_STS_AMDIX_ENABLE_;
838 		smsc95xx_mdio_write(dev->net, dev->mii.phy_id,
839 				    SPECIAL_CTRL_STS, buf);
840 	}
841 	pdata->mdix_ctrl = mdix_ctrl;
842 }
843 
844 static int smsc95xx_get_link_ksettings(struct net_device *net,
845 				       struct ethtool_link_ksettings *cmd)
846 {
847 	struct usbnet *dev = netdev_priv(net);
848 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
849 	int retval;
850 
851 	retval = usbnet_get_link_ksettings(net, cmd);
852 
853 	cmd->base.eth_tp_mdix = pdata->mdix_ctrl;
854 	cmd->base.eth_tp_mdix_ctrl = pdata->mdix_ctrl;
855 
856 	return retval;
857 }
858 
859 static int smsc95xx_set_link_ksettings(struct net_device *net,
860 				       const struct ethtool_link_ksettings *cmd)
861 {
862 	struct usbnet *dev = netdev_priv(net);
863 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
864 	int retval;
865 
866 	if (pdata->mdix_ctrl != cmd->base.eth_tp_mdix_ctrl)
867 		set_mdix_status(net, cmd->base.eth_tp_mdix_ctrl);
868 
869 	retval = usbnet_set_link_ksettings(net, cmd);
870 
871 	return retval;
872 }
873 
874 static const struct ethtool_ops smsc95xx_ethtool_ops = {
875 	.get_link	= usbnet_get_link,
876 	.nway_reset	= usbnet_nway_reset,
877 	.get_drvinfo	= usbnet_get_drvinfo,
878 	.get_msglevel	= usbnet_get_msglevel,
879 	.set_msglevel	= usbnet_set_msglevel,
880 	.get_eeprom_len	= smsc95xx_ethtool_get_eeprom_len,
881 	.get_eeprom	= smsc95xx_ethtool_get_eeprom,
882 	.set_eeprom	= smsc95xx_ethtool_set_eeprom,
883 	.get_regs_len	= smsc95xx_ethtool_getregslen,
884 	.get_regs	= smsc95xx_ethtool_getregs,
885 	.get_wol	= smsc95xx_ethtool_get_wol,
886 	.set_wol	= smsc95xx_ethtool_set_wol,
887 	.get_link_ksettings	= smsc95xx_get_link_ksettings,
888 	.set_link_ksettings	= smsc95xx_set_link_ksettings,
889 	.get_ts_info	= ethtool_op_get_ts_info,
890 };
891 
892 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
893 {
894 	struct usbnet *dev = netdev_priv(netdev);
895 
896 	if (!netif_running(netdev))
897 		return -EINVAL;
898 
899 	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
900 }
901 
902 static void smsc95xx_init_mac_address(struct usbnet *dev)
903 {
904 	const u8 *mac_addr;
905 
906 	/* maybe the boot loader passed the MAC address in devicetree */
907 	mac_addr = of_get_mac_address(dev->udev->dev.of_node);
908 	if (!IS_ERR(mac_addr)) {
909 		ether_addr_copy(dev->net->dev_addr, mac_addr);
910 		return;
911 	}
912 
913 	/* try reading mac address from EEPROM */
914 	if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
915 			dev->net->dev_addr) == 0) {
916 		if (is_valid_ether_addr(dev->net->dev_addr)) {
917 			/* eeprom values are valid so use them */
918 			netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
919 			return;
920 		}
921 	}
922 
923 	/* no useful static MAC address found. generate a random one */
924 	eth_hw_addr_random(dev->net);
925 	netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
926 }
927 
928 static int smsc95xx_set_mac_address(struct usbnet *dev)
929 {
930 	u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
931 		dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
932 	u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
933 	int ret;
934 
935 	ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
936 	if (ret < 0)
937 		return ret;
938 
939 	return smsc95xx_write_reg(dev, ADDRH, addr_hi);
940 }
941 
942 /* starts the TX path */
943 static int smsc95xx_start_tx_path(struct usbnet *dev)
944 {
945 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
946 	unsigned long flags;
947 	int ret;
948 
949 	/* Enable Tx at MAC */
950 	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
951 	pdata->mac_cr |= MAC_CR_TXEN_;
952 	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
953 
954 	ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
955 	if (ret < 0)
956 		return ret;
957 
958 	/* Enable Tx at SCSRs */
959 	return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
960 }
961 
962 /* Starts the Receive path */
963 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
964 {
965 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
966 	unsigned long flags;
967 
968 	spin_lock_irqsave(&pdata->mac_cr_lock, flags);
969 	pdata->mac_cr |= MAC_CR_RXEN_;
970 	spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
971 
972 	return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
973 }
974 
975 static int smsc95xx_phy_initialize(struct usbnet *dev)
976 {
977 	int bmcr, ret, timeout = 0;
978 
979 	/* Initialize MII structure */
980 	dev->mii.dev = dev->net;
981 	dev->mii.mdio_read = smsc95xx_mdio_read;
982 	dev->mii.mdio_write = smsc95xx_mdio_write;
983 	dev->mii.phy_id_mask = 0x1f;
984 	dev->mii.reg_num_mask = 0x1f;
985 	dev->mii.phy_id = SMSC95XX_INTERNAL_PHY_ID;
986 
987 	/* reset phy and wait for reset to complete */
988 	smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
989 
990 	do {
991 		msleep(10);
992 		bmcr = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
993 		timeout++;
994 	} while ((bmcr & BMCR_RESET) && (timeout < 100));
995 
996 	if (timeout >= 100) {
997 		netdev_warn(dev->net, "timeout on PHY Reset");
998 		return -EIO;
999 	}
1000 
1001 	smsc95xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
1002 		ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
1003 		ADVERTISE_PAUSE_ASYM);
1004 
1005 	/* read to clear */
1006 	ret = smsc95xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
1007 	if (ret < 0) {
1008 		netdev_warn(dev->net, "Failed to read PHY_INT_SRC during init\n");
1009 		return ret;
1010 	}
1011 
1012 	smsc95xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
1013 		PHY_INT_MASK_DEFAULT_);
1014 	mii_nway_restart(&dev->mii);
1015 
1016 	netif_dbg(dev, ifup, dev->net, "phy initialised successfully\n");
1017 	return 0;
1018 }
1019 
1020 static int smsc95xx_reset(struct usbnet *dev)
1021 {
1022 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1023 	u32 read_buf, write_buf, burst_cap;
1024 	int ret = 0, timeout;
1025 
1026 	netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
1027 
1028 	ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
1029 	if (ret < 0)
1030 		return ret;
1031 
1032 	timeout = 0;
1033 	do {
1034 		msleep(10);
1035 		ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1036 		if (ret < 0)
1037 			return ret;
1038 		timeout++;
1039 	} while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
1040 
1041 	if (timeout >= 100) {
1042 		netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
1043 		return ret;
1044 	}
1045 
1046 	ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
1047 	if (ret < 0)
1048 		return ret;
1049 
1050 	timeout = 0;
1051 	do {
1052 		msleep(10);
1053 		ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
1054 		if (ret < 0)
1055 			return ret;
1056 		timeout++;
1057 	} while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
1058 
1059 	if (timeout >= 100) {
1060 		netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
1061 		return ret;
1062 	}
1063 
1064 	ret = smsc95xx_set_mac_address(dev);
1065 	if (ret < 0)
1066 		return ret;
1067 
1068 	netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
1069 		  dev->net->dev_addr);
1070 
1071 	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1072 	if (ret < 0)
1073 		return ret;
1074 
1075 	netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
1076 		  read_buf);
1077 
1078 	read_buf |= HW_CFG_BIR_;
1079 
1080 	ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
1081 	if (ret < 0)
1082 		return ret;
1083 
1084 	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1085 	if (ret < 0)
1086 		return ret;
1087 
1088 	netif_dbg(dev, ifup, dev->net,
1089 		  "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
1090 		  read_buf);
1091 
1092 	if (!turbo_mode) {
1093 		burst_cap = 0;
1094 		dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
1095 	} else if (dev->udev->speed == USB_SPEED_HIGH) {
1096 		burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
1097 		dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
1098 	} else {
1099 		burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
1100 		dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
1101 	}
1102 
1103 	netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
1104 		  (ulong)dev->rx_urb_size);
1105 
1106 	ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
1107 	if (ret < 0)
1108 		return ret;
1109 
1110 	ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
1111 	if (ret < 0)
1112 		return ret;
1113 
1114 	netif_dbg(dev, ifup, dev->net,
1115 		  "Read Value from BURST_CAP after writing: 0x%08x\n",
1116 		  read_buf);
1117 
1118 	ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
1119 	if (ret < 0)
1120 		return ret;
1121 
1122 	ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
1123 	if (ret < 0)
1124 		return ret;
1125 
1126 	netif_dbg(dev, ifup, dev->net,
1127 		  "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
1128 		  read_buf);
1129 
1130 	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1131 	if (ret < 0)
1132 		return ret;
1133 
1134 	netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
1135 		  read_buf);
1136 
1137 	if (turbo_mode)
1138 		read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
1139 
1140 	read_buf &= ~HW_CFG_RXDOFF_;
1141 
1142 	/* set Rx data offset=2, Make IP header aligns on word boundary. */
1143 	read_buf |= NET_IP_ALIGN << 9;
1144 
1145 	ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
1146 	if (ret < 0)
1147 		return ret;
1148 
1149 	ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
1150 	if (ret < 0)
1151 		return ret;
1152 
1153 	netif_dbg(dev, ifup, dev->net,
1154 		  "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
1155 
1156 	ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
1157 	if (ret < 0)
1158 		return ret;
1159 
1160 	ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
1161 	if (ret < 0)
1162 		return ret;
1163 	netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
1164 
1165 	/* Configure GPIO pins as LED outputs */
1166 	write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
1167 		LED_GPIO_CFG_FDX_LED;
1168 	ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
1169 	if (ret < 0)
1170 		return ret;
1171 
1172 	/* Init Tx */
1173 	ret = smsc95xx_write_reg(dev, FLOW, 0);
1174 	if (ret < 0)
1175 		return ret;
1176 
1177 	ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1178 	if (ret < 0)
1179 		return ret;
1180 
1181 	/* Don't need mac_cr_lock during initialisation */
1182 	ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1183 	if (ret < 0)
1184 		return ret;
1185 
1186 	/* Init Rx */
1187 	/* Set Vlan */
1188 	ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1189 	if (ret < 0)
1190 		return ret;
1191 
1192 	/* Enable or disable checksum offload engines */
1193 	ret = smsc95xx_set_features(dev->net, dev->net->features);
1194 	if (ret < 0) {
1195 		netdev_warn(dev->net, "Failed to set checksum offload features\n");
1196 		return ret;
1197 	}
1198 
1199 	smsc95xx_set_multicast(dev->net);
1200 
1201 	ret = smsc95xx_phy_initialize(dev);
1202 	if (ret < 0) {
1203 		netdev_warn(dev->net, "Failed to init PHY\n");
1204 		return ret;
1205 	}
1206 
1207 	ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1208 	if (ret < 0)
1209 		return ret;
1210 
1211 	/* enable PHY interrupts */
1212 	read_buf |= INT_EP_CTL_PHY_INT_;
1213 
1214 	ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1215 	if (ret < 0)
1216 		return ret;
1217 
1218 	ret = smsc95xx_start_tx_path(dev);
1219 	if (ret < 0) {
1220 		netdev_warn(dev->net, "Failed to start TX path\n");
1221 		return ret;
1222 	}
1223 
1224 	ret = smsc95xx_start_rx_path(dev, 0);
1225 	if (ret < 0) {
1226 		netdev_warn(dev->net, "Failed to start RX path\n");
1227 		return ret;
1228 	}
1229 
1230 	netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1231 	return 0;
1232 }
1233 
1234 static const struct net_device_ops smsc95xx_netdev_ops = {
1235 	.ndo_open		= usbnet_open,
1236 	.ndo_stop		= usbnet_stop,
1237 	.ndo_start_xmit		= usbnet_start_xmit,
1238 	.ndo_tx_timeout		= usbnet_tx_timeout,
1239 	.ndo_change_mtu		= usbnet_change_mtu,
1240 	.ndo_get_stats64	= usbnet_get_stats64,
1241 	.ndo_set_mac_address 	= eth_mac_addr,
1242 	.ndo_validate_addr	= eth_validate_addr,
1243 	.ndo_do_ioctl 		= smsc95xx_ioctl,
1244 	.ndo_set_rx_mode	= smsc95xx_set_multicast,
1245 	.ndo_set_features	= smsc95xx_set_features,
1246 };
1247 
1248 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1249 {
1250 	struct smsc95xx_priv *pdata = NULL;
1251 	u32 val;
1252 	int ret;
1253 
1254 	printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1255 
1256 	ret = usbnet_get_endpoints(dev, intf);
1257 	if (ret < 0) {
1258 		netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1259 		return ret;
1260 	}
1261 
1262 	dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc95xx_priv),
1263 					      GFP_KERNEL);
1264 
1265 	pdata = (struct smsc95xx_priv *)(dev->data[0]);
1266 	if (!pdata)
1267 		return -ENOMEM;
1268 
1269 	spin_lock_init(&pdata->mac_cr_lock);
1270 
1271 	/* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1272 	 * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1273 	 * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1274 	 * it is transmitted as all ones. The zero transmitted checksum means
1275 	 * transmitter generated no checksum. Hence, enable csum offload only
1276 	 * for ipv4 packets.
1277 	 */
1278 	if (DEFAULT_TX_CSUM_ENABLE)
1279 		dev->net->features |= NETIF_F_IP_CSUM;
1280 	if (DEFAULT_RX_CSUM_ENABLE)
1281 		dev->net->features |= NETIF_F_RXCSUM;
1282 
1283 	dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1284 	set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1285 
1286 	smsc95xx_init_mac_address(dev);
1287 
1288 	/* Init all registers */
1289 	ret = smsc95xx_reset(dev);
1290 	if (ret)
1291 		goto free_pdata;
1292 
1293 	/* detect device revision as different features may be available */
1294 	ret = smsc95xx_read_reg(dev, ID_REV, &val);
1295 	if (ret < 0)
1296 		goto free_pdata;
1297 
1298 	val >>= 16;
1299 	pdata->chip_id = val;
1300 	pdata->mdix_ctrl = get_mdix_status(dev->net);
1301 
1302 	if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1303 	    (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1304 		pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1305 			FEATURE_PHY_NLP_CROSSOVER |
1306 			FEATURE_REMOTE_WAKEUP);
1307 	else if (val == ID_REV_CHIP_ID_9512_)
1308 		pdata->features = FEATURE_8_WAKEUP_FILTERS;
1309 
1310 	dev->net->netdev_ops = &smsc95xx_netdev_ops;
1311 	dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1312 	dev->net->flags |= IFF_MULTICAST;
1313 	dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1314 	dev->net->min_mtu = ETH_MIN_MTU;
1315 	dev->net->max_mtu = ETH_DATA_LEN;
1316 	dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1317 
1318 	pdata->dev = dev;
1319 	INIT_DELAYED_WORK(&pdata->carrier_check, check_carrier);
1320 	schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
1321 
1322 	return 0;
1323 
1324 free_pdata:
1325 	kfree(pdata);
1326 	return ret;
1327 }
1328 
1329 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1330 {
1331 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1332 
1333 	if (pdata) {
1334 		cancel_delayed_work_sync(&pdata->carrier_check);
1335 		netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1336 		kfree(pdata);
1337 		pdata = NULL;
1338 		dev->data[0] = 0;
1339 	}
1340 }
1341 
1342 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1343 {
1344 	u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1345 	return crc << ((filter % 2) * 16);
1346 }
1347 
1348 static int smsc95xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
1349 {
1350 	struct mii_if_info *mii = &dev->mii;
1351 	int ret;
1352 
1353 	netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
1354 
1355 	/* read to clear */
1356 	ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_SRC);
1357 	if (ret < 0)
1358 		return ret;
1359 
1360 	/* enable interrupt source */
1361 	ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_MASK);
1362 	if (ret < 0)
1363 		return ret;
1364 
1365 	ret |= mask;
1366 
1367 	smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_INT_MASK, ret);
1368 
1369 	return 0;
1370 }
1371 
1372 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1373 {
1374 	struct mii_if_info *mii = &dev->mii;
1375 	int ret;
1376 
1377 	/* first, a dummy read, needed to latch some MII phys */
1378 	ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
1379 	if (ret < 0)
1380 		return ret;
1381 
1382 	ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
1383 	if (ret < 0)
1384 		return ret;
1385 
1386 	return !!(ret & BMSR_LSTATUS);
1387 }
1388 
1389 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1390 {
1391 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1392 	u32 val;
1393 	int ret;
1394 
1395 	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1396 	if (ret < 0)
1397 		return ret;
1398 
1399 	val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1400 	val |= PM_CTL_SUS_MODE_0;
1401 
1402 	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1403 	if (ret < 0)
1404 		return ret;
1405 
1406 	/* clear wol status */
1407 	val &= ~PM_CTL_WUPS_;
1408 	val |= PM_CTL_WUPS_WOL_;
1409 
1410 	/* enable energy detection */
1411 	if (pdata->wolopts & WAKE_PHY)
1412 		val |= PM_CTL_WUPS_ED_;
1413 
1414 	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1415 	if (ret < 0)
1416 		return ret;
1417 
1418 	/* read back PM_CTRL */
1419 	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1420 	if (ret < 0)
1421 		return ret;
1422 
1423 	pdata->suspend_flags |= SUSPEND_SUSPEND0;
1424 
1425 	return 0;
1426 }
1427 
1428 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1429 {
1430 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1431 	struct mii_if_info *mii = &dev->mii;
1432 	u32 val;
1433 	int ret;
1434 
1435 	/* reconfigure link pulse detection timing for
1436 	 * compatibility with non-standard link partners
1437 	 */
1438 	if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1439 		smsc95xx_mdio_write_nopm(dev->net, mii->phy_id,	PHY_EDPD_CONFIG,
1440 			PHY_EDPD_CONFIG_DEFAULT);
1441 
1442 	/* enable energy detect power-down mode */
1443 	ret = smsc95xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_MODE_CTRL_STS);
1444 	if (ret < 0)
1445 		return ret;
1446 
1447 	ret |= MODE_CTRL_STS_EDPWRDOWN_;
1448 
1449 	smsc95xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_MODE_CTRL_STS, ret);
1450 
1451 	/* enter SUSPEND1 mode */
1452 	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1453 	if (ret < 0)
1454 		return ret;
1455 
1456 	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1457 	val |= PM_CTL_SUS_MODE_1;
1458 
1459 	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1460 	if (ret < 0)
1461 		return ret;
1462 
1463 	/* clear wol status, enable energy detection */
1464 	val &= ~PM_CTL_WUPS_;
1465 	val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1466 
1467 	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1468 	if (ret < 0)
1469 		return ret;
1470 
1471 	pdata->suspend_flags |= SUSPEND_SUSPEND1;
1472 
1473 	return 0;
1474 }
1475 
1476 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1477 {
1478 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1479 	u32 val;
1480 	int ret;
1481 
1482 	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1483 	if (ret < 0)
1484 		return ret;
1485 
1486 	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1487 	val |= PM_CTL_SUS_MODE_2;
1488 
1489 	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1490 	if (ret < 0)
1491 		return ret;
1492 
1493 	pdata->suspend_flags |= SUSPEND_SUSPEND2;
1494 
1495 	return 0;
1496 }
1497 
1498 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1499 {
1500 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1501 	u32 val;
1502 	int ret;
1503 
1504 	ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1505 	if (ret < 0)
1506 		return ret;
1507 
1508 	if (val & RX_FIFO_INF_USED_) {
1509 		netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1510 		return -EBUSY;
1511 	}
1512 
1513 	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1514 	if (ret < 0)
1515 		return ret;
1516 
1517 	val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1518 	val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1519 
1520 	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1521 	if (ret < 0)
1522 		return ret;
1523 
1524 	/* clear wol status */
1525 	val &= ~PM_CTL_WUPS_;
1526 	val |= PM_CTL_WUPS_WOL_;
1527 
1528 	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1529 	if (ret < 0)
1530 		return ret;
1531 
1532 	pdata->suspend_flags |= SUSPEND_SUSPEND3;
1533 
1534 	return 0;
1535 }
1536 
1537 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1538 {
1539 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1540 	int ret;
1541 
1542 	if (!netif_running(dev->net)) {
1543 		/* interface is ifconfig down so fully power down hw */
1544 		netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1545 		return smsc95xx_enter_suspend2(dev);
1546 	}
1547 
1548 	if (!link_up) {
1549 		/* link is down so enter EDPD mode, but only if device can
1550 		 * reliably resume from it.  This check should be redundant
1551 		 * as current FEATURE_REMOTE_WAKEUP parts also support
1552 		 * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1553 		if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1554 			netdev_warn(dev->net, "EDPD not supported\n");
1555 			return -EBUSY;
1556 		}
1557 
1558 		netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1559 
1560 		/* enable PHY wakeup events for if cable is attached */
1561 		ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1562 			PHY_INT_MASK_ANEG_COMP_);
1563 		if (ret < 0) {
1564 			netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1565 			return ret;
1566 		}
1567 
1568 		netdev_info(dev->net, "entering SUSPEND1 mode\n");
1569 		return smsc95xx_enter_suspend1(dev);
1570 	}
1571 
1572 	/* enable PHY wakeup events so we remote wakeup if cable is pulled */
1573 	ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1574 		PHY_INT_MASK_LINK_DOWN_);
1575 	if (ret < 0) {
1576 		netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1577 		return ret;
1578 	}
1579 
1580 	netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1581 	return smsc95xx_enter_suspend3(dev);
1582 }
1583 
1584 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1585 {
1586 	struct usbnet *dev = usb_get_intfdata(intf);
1587 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
1588 	u32 val, link_up;
1589 	int ret;
1590 
1591 	ret = usbnet_suspend(intf, message);
1592 	if (ret < 0) {
1593 		netdev_warn(dev->net, "usbnet_suspend error\n");
1594 		return ret;
1595 	}
1596 
1597 	cancel_delayed_work_sync(&pdata->carrier_check);
1598 
1599 	if (pdata->suspend_flags) {
1600 		netdev_warn(dev->net, "error during last resume\n");
1601 		pdata->suspend_flags = 0;
1602 	}
1603 
1604 	/* determine if link is up using only _nopm functions */
1605 	link_up = smsc95xx_link_ok_nopm(dev);
1606 
1607 	if (message.event == PM_EVENT_AUTO_SUSPEND &&
1608 	    (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1609 		ret = smsc95xx_autosuspend(dev, link_up);
1610 		goto done;
1611 	}
1612 
1613 	/* if we get this far we're not autosuspending */
1614 	/* if no wol options set, or if link is down and we're not waking on
1615 	 * PHY activity, enter lowest power SUSPEND2 mode
1616 	 */
1617 	if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1618 		!(link_up || (pdata->wolopts & WAKE_PHY))) {
1619 		netdev_info(dev->net, "entering SUSPEND2 mode\n");
1620 
1621 		/* disable energy detect (link up) & wake up events */
1622 		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1623 		if (ret < 0)
1624 			goto done;
1625 
1626 		val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1627 
1628 		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1629 		if (ret < 0)
1630 			goto done;
1631 
1632 		ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1633 		if (ret < 0)
1634 			goto done;
1635 
1636 		val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1637 
1638 		ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1639 		if (ret < 0)
1640 			goto done;
1641 
1642 		ret = smsc95xx_enter_suspend2(dev);
1643 		goto done;
1644 	}
1645 
1646 	if (pdata->wolopts & WAKE_PHY) {
1647 		ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1648 			(PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
1649 		if (ret < 0) {
1650 			netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1651 			goto done;
1652 		}
1653 
1654 		/* if link is down then configure EDPD and enter SUSPEND1,
1655 		 * otherwise enter SUSPEND0 below
1656 		 */
1657 		if (!link_up) {
1658 			netdev_info(dev->net, "entering SUSPEND1 mode\n");
1659 			ret = smsc95xx_enter_suspend1(dev);
1660 			goto done;
1661 		}
1662 	}
1663 
1664 	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1665 		u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1666 		u32 command[2];
1667 		u32 offset[2];
1668 		u32 crc[4];
1669 		int wuff_filter_count =
1670 			(pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1671 			LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1672 		int i, filter = 0;
1673 
1674 		if (!filter_mask) {
1675 			netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1676 			ret = -ENOMEM;
1677 			goto done;
1678 		}
1679 
1680 		memset(command, 0, sizeof(command));
1681 		memset(offset, 0, sizeof(offset));
1682 		memset(crc, 0, sizeof(crc));
1683 
1684 		if (pdata->wolopts & WAKE_BCAST) {
1685 			const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1686 			netdev_info(dev->net, "enabling broadcast detection\n");
1687 			filter_mask[filter * 4] = 0x003F;
1688 			filter_mask[filter * 4 + 1] = 0x00;
1689 			filter_mask[filter * 4 + 2] = 0x00;
1690 			filter_mask[filter * 4 + 3] = 0x00;
1691 			command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1692 			offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1693 			crc[filter/2] |= smsc_crc(bcast, 6, filter);
1694 			filter++;
1695 		}
1696 
1697 		if (pdata->wolopts & WAKE_MCAST) {
1698 			const u8 mcast[] = {0x01, 0x00, 0x5E};
1699 			netdev_info(dev->net, "enabling multicast detection\n");
1700 			filter_mask[filter * 4] = 0x0007;
1701 			filter_mask[filter * 4 + 1] = 0x00;
1702 			filter_mask[filter * 4 + 2] = 0x00;
1703 			filter_mask[filter * 4 + 3] = 0x00;
1704 			command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1705 			offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1706 			crc[filter/2] |= smsc_crc(mcast, 3, filter);
1707 			filter++;
1708 		}
1709 
1710 		if (pdata->wolopts & WAKE_ARP) {
1711 			const u8 arp[] = {0x08, 0x06};
1712 			netdev_info(dev->net, "enabling ARP detection\n");
1713 			filter_mask[filter * 4] = 0x0003;
1714 			filter_mask[filter * 4 + 1] = 0x00;
1715 			filter_mask[filter * 4 + 2] = 0x00;
1716 			filter_mask[filter * 4 + 3] = 0x00;
1717 			command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1718 			offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1719 			crc[filter/2] |= smsc_crc(arp, 2, filter);
1720 			filter++;
1721 		}
1722 
1723 		if (pdata->wolopts & WAKE_UCAST) {
1724 			netdev_info(dev->net, "enabling unicast detection\n");
1725 			filter_mask[filter * 4] = 0x003F;
1726 			filter_mask[filter * 4 + 1] = 0x00;
1727 			filter_mask[filter * 4 + 2] = 0x00;
1728 			filter_mask[filter * 4 + 3] = 0x00;
1729 			command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1730 			offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1731 			crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1732 			filter++;
1733 		}
1734 
1735 		for (i = 0; i < (wuff_filter_count * 4); i++) {
1736 			ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
1737 			if (ret < 0) {
1738 				kfree(filter_mask);
1739 				goto done;
1740 			}
1741 		}
1742 		kfree(filter_mask);
1743 
1744 		for (i = 0; i < (wuff_filter_count / 4); i++) {
1745 			ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
1746 			if (ret < 0)
1747 				goto done;
1748 		}
1749 
1750 		for (i = 0; i < (wuff_filter_count / 4); i++) {
1751 			ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
1752 			if (ret < 0)
1753 				goto done;
1754 		}
1755 
1756 		for (i = 0; i < (wuff_filter_count / 2); i++) {
1757 			ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
1758 			if (ret < 0)
1759 				goto done;
1760 		}
1761 
1762 		/* clear any pending pattern match packet status */
1763 		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1764 		if (ret < 0)
1765 			goto done;
1766 
1767 		val |= WUCSR_WUFR_;
1768 
1769 		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1770 		if (ret < 0)
1771 			goto done;
1772 	}
1773 
1774 	if (pdata->wolopts & WAKE_MAGIC) {
1775 		/* clear any pending magic packet status */
1776 		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1777 		if (ret < 0)
1778 			goto done;
1779 
1780 		val |= WUCSR_MPR_;
1781 
1782 		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1783 		if (ret < 0)
1784 			goto done;
1785 	}
1786 
1787 	/* enable/disable wakeup sources */
1788 	ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1789 	if (ret < 0)
1790 		goto done;
1791 
1792 	if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1793 		netdev_info(dev->net, "enabling pattern match wakeup\n");
1794 		val |= WUCSR_WAKE_EN_;
1795 	} else {
1796 		netdev_info(dev->net, "disabling pattern match wakeup\n");
1797 		val &= ~WUCSR_WAKE_EN_;
1798 	}
1799 
1800 	if (pdata->wolopts & WAKE_MAGIC) {
1801 		netdev_info(dev->net, "enabling magic packet wakeup\n");
1802 		val |= WUCSR_MPEN_;
1803 	} else {
1804 		netdev_info(dev->net, "disabling magic packet wakeup\n");
1805 		val &= ~WUCSR_MPEN_;
1806 	}
1807 
1808 	ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1809 	if (ret < 0)
1810 		goto done;
1811 
1812 	/* enable wol wakeup source */
1813 	ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1814 	if (ret < 0)
1815 		goto done;
1816 
1817 	val |= PM_CTL_WOL_EN_;
1818 
1819 	/* phy energy detect wakeup source */
1820 	if (pdata->wolopts & WAKE_PHY)
1821 		val |= PM_CTL_ED_EN_;
1822 
1823 	ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1824 	if (ret < 0)
1825 		goto done;
1826 
1827 	/* enable receiver to enable frame reception */
1828 	smsc95xx_start_rx_path(dev, 1);
1829 
1830 	/* some wol options are enabled, so enter SUSPEND0 */
1831 	netdev_info(dev->net, "entering SUSPEND0 mode\n");
1832 	ret = smsc95xx_enter_suspend0(dev);
1833 
1834 done:
1835 	/*
1836 	 * TODO: resume() might need to handle the suspend failure
1837 	 * in system sleep
1838 	 */
1839 	if (ret && PMSG_IS_AUTO(message))
1840 		usbnet_resume(intf);
1841 
1842 	if (ret)
1843 		schedule_delayed_work(&pdata->carrier_check,
1844 				      CARRIER_CHECK_DELAY);
1845 
1846 	return ret;
1847 }
1848 
1849 static int smsc95xx_resume(struct usb_interface *intf)
1850 {
1851 	struct usbnet *dev = usb_get_intfdata(intf);
1852 	struct smsc95xx_priv *pdata;
1853 	u8 suspend_flags;
1854 	int ret;
1855 	u32 val;
1856 
1857 	BUG_ON(!dev);
1858 	pdata = (struct smsc95xx_priv *)(dev->data[0]);
1859 	suspend_flags = pdata->suspend_flags;
1860 
1861 	netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1862 
1863 	/* do this first to ensure it's cleared even in error case */
1864 	pdata->suspend_flags = 0;
1865 	schedule_delayed_work(&pdata->carrier_check, CARRIER_CHECK_DELAY);
1866 
1867 	if (suspend_flags & SUSPEND_ALLMODES) {
1868 		/* clear wake-up sources */
1869 		ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1870 		if (ret < 0)
1871 			return ret;
1872 
1873 		val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1874 
1875 		ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1876 		if (ret < 0)
1877 			return ret;
1878 
1879 		/* clear wake-up status */
1880 		ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1881 		if (ret < 0)
1882 			return ret;
1883 
1884 		val &= ~PM_CTL_WOL_EN_;
1885 		val |= PM_CTL_WUPS_;
1886 
1887 		ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1888 		if (ret < 0)
1889 			return ret;
1890 	}
1891 
1892 	ret = usbnet_resume(intf);
1893 	if (ret < 0)
1894 		netdev_warn(dev->net, "usbnet_resume error\n");
1895 
1896 	return ret;
1897 }
1898 
1899 static int smsc95xx_reset_resume(struct usb_interface *intf)
1900 {
1901 	struct usbnet *dev = usb_get_intfdata(intf);
1902 	int ret;
1903 
1904 	ret = smsc95xx_reset(dev);
1905 	if (ret < 0)
1906 		return ret;
1907 
1908 	return smsc95xx_resume(intf);
1909 }
1910 
1911 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1912 {
1913 	skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1914 	skb->ip_summed = CHECKSUM_COMPLETE;
1915 	skb_trim(skb, skb->len - 2);
1916 }
1917 
1918 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1919 {
1920 	/* This check is no longer done by usbnet */
1921 	if (skb->len < dev->net->hard_header_len)
1922 		return 0;
1923 
1924 	while (skb->len > 0) {
1925 		u32 header, align_count;
1926 		struct sk_buff *ax_skb;
1927 		unsigned char *packet;
1928 		u16 size;
1929 
1930 		header = get_unaligned_le32(skb->data);
1931 		skb_pull(skb, 4 + NET_IP_ALIGN);
1932 		packet = skb->data;
1933 
1934 		/* get the packet length */
1935 		size = (u16)((header & RX_STS_FL_) >> 16);
1936 		align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1937 
1938 		if (unlikely(header & RX_STS_ES_)) {
1939 			netif_dbg(dev, rx_err, dev->net,
1940 				  "Error header=0x%08x\n", header);
1941 			dev->net->stats.rx_errors++;
1942 			dev->net->stats.rx_dropped++;
1943 
1944 			if (header & RX_STS_CRC_) {
1945 				dev->net->stats.rx_crc_errors++;
1946 			} else {
1947 				if (header & (RX_STS_TL_ | RX_STS_RF_))
1948 					dev->net->stats.rx_frame_errors++;
1949 
1950 				if ((header & RX_STS_LE_) &&
1951 					(!(header & RX_STS_FT_)))
1952 					dev->net->stats.rx_length_errors++;
1953 			}
1954 		} else {
1955 			/* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1956 			if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1957 				netif_dbg(dev, rx_err, dev->net,
1958 					  "size err header=0x%08x\n", header);
1959 				return 0;
1960 			}
1961 
1962 			/* last frame in this batch */
1963 			if (skb->len == size) {
1964 				if (dev->net->features & NETIF_F_RXCSUM)
1965 					smsc95xx_rx_csum_offload(skb);
1966 				skb_trim(skb, skb->len - 4); /* remove fcs */
1967 				skb->truesize = size + sizeof(struct sk_buff);
1968 
1969 				return 1;
1970 			}
1971 
1972 			ax_skb = skb_clone(skb, GFP_ATOMIC);
1973 			if (unlikely(!ax_skb)) {
1974 				netdev_warn(dev->net, "Error allocating skb\n");
1975 				return 0;
1976 			}
1977 
1978 			ax_skb->len = size;
1979 			ax_skb->data = packet;
1980 			skb_set_tail_pointer(ax_skb, size);
1981 
1982 			if (dev->net->features & NETIF_F_RXCSUM)
1983 				smsc95xx_rx_csum_offload(ax_skb);
1984 			skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1985 			ax_skb->truesize = size + sizeof(struct sk_buff);
1986 
1987 			usbnet_skb_return(dev, ax_skb);
1988 		}
1989 
1990 		skb_pull(skb, size);
1991 
1992 		/* padding bytes before the next frame starts */
1993 		if (skb->len)
1994 			skb_pull(skb, align_count);
1995 	}
1996 
1997 	return 1;
1998 }
1999 
2000 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
2001 {
2002 	u16 low_16 = (u16)skb_checksum_start_offset(skb);
2003 	u16 high_16 = low_16 + skb->csum_offset;
2004 	return (high_16 << 16) | low_16;
2005 }
2006 
2007 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
2008  * transmission. This is fairly unlikely, only seems to trigger with some
2009  * short TCP ACK packets sent.
2010  *
2011  * Note, this calculation should probably check for the alignment of the
2012  * data as well, but a straight check for csum being in the last four bytes
2013  * of the packet should be ok for now.
2014  */
2015 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
2016 {
2017        unsigned int len = skb->len - skb_checksum_start_offset(skb);
2018 
2019        if (skb->len <= 45)
2020 	       return false;
2021        return skb->csum_offset < (len - (4 + 1));
2022 }
2023 
2024 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
2025 					 struct sk_buff *skb, gfp_t flags)
2026 {
2027 	bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
2028 	int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
2029 	u32 tx_cmd_a, tx_cmd_b;
2030 	void *ptr;
2031 
2032 	/* We do not advertise SG, so skbs should be already linearized */
2033 	BUG_ON(skb_shinfo(skb)->nr_frags);
2034 
2035 	/* Make writable and expand header space by overhead if required */
2036 	if (skb_cow_head(skb, overhead)) {
2037 		/* Must deallocate here as returning NULL to indicate error
2038 		 * means the skb won't be deallocated in the caller.
2039 		 */
2040 		dev_kfree_skb_any(skb);
2041 		return NULL;
2042 	}
2043 
2044 	tx_cmd_b = (u32)skb->len;
2045 	tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
2046 
2047 	if (csum) {
2048 		if (!smsc95xx_can_tx_checksum(skb)) {
2049 			/* workaround - hardware tx checksum does not work
2050 			 * properly with extremely small packets */
2051 			long csstart = skb_checksum_start_offset(skb);
2052 			__wsum calc = csum_partial(skb->data + csstart,
2053 				skb->len - csstart, 0);
2054 			*((__sum16 *)(skb->data + csstart
2055 				+ skb->csum_offset)) = csum_fold(calc);
2056 
2057 			csum = false;
2058 		} else {
2059 			u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
2060 			ptr = skb_push(skb, 4);
2061 			put_unaligned_le32(csum_preamble, ptr);
2062 
2063 			tx_cmd_a += 4;
2064 			tx_cmd_b += 4;
2065 			tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
2066 		}
2067 	}
2068 
2069 	ptr = skb_push(skb, 8);
2070 	put_unaligned_le32(tx_cmd_a, ptr);
2071 	put_unaligned_le32(tx_cmd_b, ptr+4);
2072 
2073 	return skb;
2074 }
2075 
2076 static int smsc95xx_manage_power(struct usbnet *dev, int on)
2077 {
2078 	struct smsc95xx_priv *pdata = (struct smsc95xx_priv *)(dev->data[0]);
2079 
2080 	dev->intf->needs_remote_wakeup = on;
2081 
2082 	if (pdata->features & FEATURE_REMOTE_WAKEUP)
2083 		return 0;
2084 
2085 	/* this chip revision isn't capable of remote wakeup */
2086 	netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
2087 
2088 	if (on)
2089 		usb_autopm_get_interface_no_resume(dev->intf);
2090 	else
2091 		usb_autopm_put_interface(dev->intf);
2092 
2093 	return 0;
2094 }
2095 
2096 static const struct driver_info smsc95xx_info = {
2097 	.description	= "smsc95xx USB 2.0 Ethernet",
2098 	.bind		= smsc95xx_bind,
2099 	.unbind		= smsc95xx_unbind,
2100 	.link_reset	= smsc95xx_link_reset,
2101 	.reset		= smsc95xx_reset,
2102 	.rx_fixup	= smsc95xx_rx_fixup,
2103 	.tx_fixup	= smsc95xx_tx_fixup,
2104 	.status		= smsc95xx_status,
2105 	.manage_power	= smsc95xx_manage_power,
2106 	.flags		= FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
2107 };
2108 
2109 static const struct usb_device_id products[] = {
2110 	{
2111 		/* SMSC9500 USB Ethernet Device */
2112 		USB_DEVICE(0x0424, 0x9500),
2113 		.driver_info = (unsigned long) &smsc95xx_info,
2114 	},
2115 	{
2116 		/* SMSC9505 USB Ethernet Device */
2117 		USB_DEVICE(0x0424, 0x9505),
2118 		.driver_info = (unsigned long) &smsc95xx_info,
2119 	},
2120 	{
2121 		/* SMSC9500A USB Ethernet Device */
2122 		USB_DEVICE(0x0424, 0x9E00),
2123 		.driver_info = (unsigned long) &smsc95xx_info,
2124 	},
2125 	{
2126 		/* SMSC9505A USB Ethernet Device */
2127 		USB_DEVICE(0x0424, 0x9E01),
2128 		.driver_info = (unsigned long) &smsc95xx_info,
2129 	},
2130 	{
2131 		/* SMSC9512/9514 USB Hub & Ethernet Device */
2132 		USB_DEVICE(0x0424, 0xec00),
2133 		.driver_info = (unsigned long) &smsc95xx_info,
2134 	},
2135 	{
2136 		/* SMSC9500 USB Ethernet Device (SAL10) */
2137 		USB_DEVICE(0x0424, 0x9900),
2138 		.driver_info = (unsigned long) &smsc95xx_info,
2139 	},
2140 	{
2141 		/* SMSC9505 USB Ethernet Device (SAL10) */
2142 		USB_DEVICE(0x0424, 0x9901),
2143 		.driver_info = (unsigned long) &smsc95xx_info,
2144 	},
2145 	{
2146 		/* SMSC9500A USB Ethernet Device (SAL10) */
2147 		USB_DEVICE(0x0424, 0x9902),
2148 		.driver_info = (unsigned long) &smsc95xx_info,
2149 	},
2150 	{
2151 		/* SMSC9505A USB Ethernet Device (SAL10) */
2152 		USB_DEVICE(0x0424, 0x9903),
2153 		.driver_info = (unsigned long) &smsc95xx_info,
2154 	},
2155 	{
2156 		/* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2157 		USB_DEVICE(0x0424, 0x9904),
2158 		.driver_info = (unsigned long) &smsc95xx_info,
2159 	},
2160 	{
2161 		/* SMSC9500A USB Ethernet Device (HAL) */
2162 		USB_DEVICE(0x0424, 0x9905),
2163 		.driver_info = (unsigned long) &smsc95xx_info,
2164 	},
2165 	{
2166 		/* SMSC9505A USB Ethernet Device (HAL) */
2167 		USB_DEVICE(0x0424, 0x9906),
2168 		.driver_info = (unsigned long) &smsc95xx_info,
2169 	},
2170 	{
2171 		/* SMSC9500 USB Ethernet Device (Alternate ID) */
2172 		USB_DEVICE(0x0424, 0x9907),
2173 		.driver_info = (unsigned long) &smsc95xx_info,
2174 	},
2175 	{
2176 		/* SMSC9500A USB Ethernet Device (Alternate ID) */
2177 		USB_DEVICE(0x0424, 0x9908),
2178 		.driver_info = (unsigned long) &smsc95xx_info,
2179 	},
2180 	{
2181 		/* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2182 		USB_DEVICE(0x0424, 0x9909),
2183 		.driver_info = (unsigned long) &smsc95xx_info,
2184 	},
2185 	{
2186 		/* SMSC LAN9530 USB Ethernet Device */
2187 		USB_DEVICE(0x0424, 0x9530),
2188 		.driver_info = (unsigned long) &smsc95xx_info,
2189 	},
2190 	{
2191 		/* SMSC LAN9730 USB Ethernet Device */
2192 		USB_DEVICE(0x0424, 0x9730),
2193 		.driver_info = (unsigned long) &smsc95xx_info,
2194 	},
2195 	{
2196 		/* SMSC LAN89530 USB Ethernet Device */
2197 		USB_DEVICE(0x0424, 0x9E08),
2198 		.driver_info = (unsigned long) &smsc95xx_info,
2199 	},
2200 	{ },		/* END */
2201 };
2202 MODULE_DEVICE_TABLE(usb, products);
2203 
2204 static struct usb_driver smsc95xx_driver = {
2205 	.name		= "smsc95xx",
2206 	.id_table	= products,
2207 	.probe		= usbnet_probe,
2208 	.suspend	= smsc95xx_suspend,
2209 	.resume		= smsc95xx_resume,
2210 	.reset_resume	= smsc95xx_reset_resume,
2211 	.disconnect	= usbnet_disconnect,
2212 	.disable_hub_initiated_lpm = 1,
2213 	.supports_autosuspend = 1,
2214 };
2215 
2216 module_usb_driver(smsc95xx_driver);
2217 
2218 MODULE_AUTHOR("Nancy Lin");
2219 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2220 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2221 MODULE_LICENSE("GPL");
2222