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 <linux/mdio.h>
22 #include <linux/phy.h>
23 #include "smsc95xx.h"
24
25 #define SMSC_CHIPNAME "smsc95xx"
26 #define SMSC_DRIVER_VERSION "2.0.0"
27 #define HS_USB_PKT_SIZE (512)
28 #define FS_USB_PKT_SIZE (64)
29 #define DEFAULT_HS_BURST_CAP_SIZE (16 * 1024 + 5 * HS_USB_PKT_SIZE)
30 #define DEFAULT_FS_BURST_CAP_SIZE (6 * 1024 + 33 * FS_USB_PKT_SIZE)
31 #define DEFAULT_BULK_IN_DELAY (0x00002000)
32 #define MAX_SINGLE_PACKET_SIZE (2048)
33 #define LAN95XX_EEPROM_MAGIC (0x9500)
34 #define EEPROM_MAC_OFFSET (0x01)
35 #define DEFAULT_TX_CSUM_ENABLE (true)
36 #define DEFAULT_RX_CSUM_ENABLE (true)
37 #define SMSC95XX_INTERNAL_PHY_ID (1)
38 #define SMSC95XX_TX_OVERHEAD (8)
39 #define SMSC95XX_TX_OVERHEAD_CSUM (12)
40 #define SUPPORTED_WAKE (WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
41 WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
42
43 #define FEATURE_8_WAKEUP_FILTERS (0x01)
44 #define FEATURE_PHY_NLP_CROSSOVER (0x02)
45 #define FEATURE_REMOTE_WAKEUP (0x04)
46
47 #define SUSPEND_SUSPEND0 (0x01)
48 #define SUSPEND_SUSPEND1 (0x02)
49 #define SUSPEND_SUSPEND2 (0x04)
50 #define SUSPEND_SUSPEND3 (0x08)
51 #define SUSPEND_ALLMODES (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
52 SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
53
54 struct smsc95xx_priv {
55 u32 mac_cr;
56 u32 hash_hi;
57 u32 hash_lo;
58 u32 wolopts;
59 spinlock_t mac_cr_lock;
60 u8 features;
61 u8 suspend_flags;
62 struct mii_bus *mdiobus;
63 struct phy_device *phydev;
64 struct task_struct *pm_task;
65 };
66
67 static bool turbo_mode = true;
68 module_param(turbo_mode, bool, 0644);
69 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
70
__smsc95xx_read_reg(struct usbnet * dev,u32 index,u32 * data,int in_pm)71 static int __must_check __smsc95xx_read_reg(struct usbnet *dev, u32 index,
72 u32 *data, int in_pm)
73 {
74 struct smsc95xx_priv *pdata = dev->driver_priv;
75 u32 buf;
76 int ret;
77 int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
78
79 BUG_ON(!dev);
80
81 if (current != pdata->pm_task)
82 fn = usbnet_read_cmd;
83 else
84 fn = usbnet_read_cmd_nopm;
85
86 ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
87 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
88 0, index, &buf, 4);
89 if (ret < 4) {
90 ret = ret < 0 ? ret : -ENODATA;
91
92 if (ret != -ENODEV)
93 netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
94 index, ret);
95 return ret;
96 }
97
98 le32_to_cpus(&buf);
99 *data = buf;
100
101 return ret;
102 }
103
__smsc95xx_write_reg(struct usbnet * dev,u32 index,u32 data,int in_pm)104 static int __must_check __smsc95xx_write_reg(struct usbnet *dev, u32 index,
105 u32 data, int in_pm)
106 {
107 struct smsc95xx_priv *pdata = dev->driver_priv;
108 u32 buf;
109 int ret;
110 int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
111
112 BUG_ON(!dev);
113
114 if (current != pdata->pm_task)
115 fn = usbnet_write_cmd;
116 else
117 fn = usbnet_write_cmd_nopm;
118
119 buf = data;
120 cpu_to_le32s(&buf);
121
122 ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
123 | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
124 0, index, &buf, 4);
125 if (ret < 0 && ret != -ENODEV)
126 netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
127 index, ret);
128
129 return ret;
130 }
131
smsc95xx_read_reg_nopm(struct usbnet * dev,u32 index,u32 * data)132 static int __must_check smsc95xx_read_reg_nopm(struct usbnet *dev, u32 index,
133 u32 *data)
134 {
135 return __smsc95xx_read_reg(dev, index, data, 1);
136 }
137
smsc95xx_write_reg_nopm(struct usbnet * dev,u32 index,u32 data)138 static int __must_check smsc95xx_write_reg_nopm(struct usbnet *dev, u32 index,
139 u32 data)
140 {
141 return __smsc95xx_write_reg(dev, index, data, 1);
142 }
143
smsc95xx_read_reg(struct usbnet * dev,u32 index,u32 * data)144 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
145 u32 *data)
146 {
147 return __smsc95xx_read_reg(dev, index, data, 0);
148 }
149
smsc95xx_write_reg(struct usbnet * dev,u32 index,u32 data)150 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
151 u32 data)
152 {
153 return __smsc95xx_write_reg(dev, index, data, 0);
154 }
155
156 /* Loop until the read is completed with timeout
157 * called with phy_mutex held */
__smsc95xx_phy_wait_not_busy(struct usbnet * dev,int in_pm)158 static int __must_check __smsc95xx_phy_wait_not_busy(struct usbnet *dev,
159 int in_pm)
160 {
161 unsigned long start_time = jiffies;
162 u32 val;
163 int ret;
164
165 do {
166 ret = __smsc95xx_read_reg(dev, MII_ADDR, &val, in_pm);
167 if (ret < 0) {
168 /* Ignore -ENODEV error during disconnect() */
169 if (ret == -ENODEV)
170 return 0;
171 netdev_warn(dev->net, "Error reading MII_ACCESS\n");
172 return ret;
173 }
174
175 if (!(val & MII_BUSY_))
176 return 0;
177 } while (!time_after(jiffies, start_time + HZ));
178
179 return -EIO;
180 }
181
mii_address_cmd(int phy_id,int idx,u16 op)182 static u32 mii_address_cmd(int phy_id, int idx, u16 op)
183 {
184 return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
185 }
186
__smsc95xx_mdio_read(struct usbnet * dev,int phy_id,int idx,int in_pm)187 static int __smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx,
188 int in_pm)
189 {
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, "%s: MII is busy\n", __func__);
199 goto done;
200 }
201
202 /* set the address, index & direction (read from PHY) */
203 addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
204 ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
205 if (ret < 0) {
206 if (ret != -ENODEV)
207 netdev_warn(dev->net, "Error writing MII_ADDR\n");
208 goto done;
209 }
210
211 ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
212 if (ret < 0) {
213 netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
214 goto done;
215 }
216
217 ret = __smsc95xx_read_reg(dev, MII_DATA, &val, in_pm);
218 if (ret < 0) {
219 if (ret != -ENODEV)
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
229 /* Ignore -ENODEV error during disconnect() */
230 if (ret == -ENODEV)
231 return 0;
232 return ret;
233 }
234
__smsc95xx_mdio_write(struct usbnet * dev,int phy_id,int idx,int regval,int in_pm)235 static void __smsc95xx_mdio_write(struct usbnet *dev, int phy_id,
236 int idx, int regval, int in_pm)
237 {
238 u32 val, addr;
239 int ret;
240
241 mutex_lock(&dev->phy_mutex);
242
243 /* confirm MII not busy */
244 ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
245 if (ret < 0) {
246 netdev_warn(dev->net, "%s: MII is busy\n", __func__);
247 goto done;
248 }
249
250 val = regval;
251 ret = __smsc95xx_write_reg(dev, MII_DATA, val, in_pm);
252 if (ret < 0) {
253 if (ret != -ENODEV)
254 netdev_warn(dev->net, "Error writing MII_DATA\n");
255 goto done;
256 }
257
258 /* set the address, index & direction (write to PHY) */
259 addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
260 ret = __smsc95xx_write_reg(dev, MII_ADDR, addr, in_pm);
261 if (ret < 0) {
262 if (ret != -ENODEV)
263 netdev_warn(dev->net, "Error writing MII_ADDR\n");
264 goto done;
265 }
266
267 ret = __smsc95xx_phy_wait_not_busy(dev, in_pm);
268 if (ret < 0) {
269 netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
270 goto done;
271 }
272
273 done:
274 mutex_unlock(&dev->phy_mutex);
275 }
276
smsc95xx_mdio_read_nopm(struct usbnet * dev,int idx)277 static int smsc95xx_mdio_read_nopm(struct usbnet *dev, int idx)
278 {
279 struct smsc95xx_priv *pdata = dev->driver_priv;
280
281 return __smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, idx, 1);
282 }
283
smsc95xx_mdio_write_nopm(struct usbnet * dev,int idx,int regval)284 static void smsc95xx_mdio_write_nopm(struct usbnet *dev, int idx, int regval)
285 {
286 struct smsc95xx_priv *pdata = dev->driver_priv;
287
288 __smsc95xx_mdio_write(dev, pdata->phydev->mdio.addr, idx, regval, 1);
289 }
290
smsc95xx_mdiobus_read(struct mii_bus * bus,int phy_id,int idx)291 static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
292 {
293 struct usbnet *dev = bus->priv;
294
295 return __smsc95xx_mdio_read(dev, phy_id, idx, 0);
296 }
297
smsc95xx_mdiobus_write(struct mii_bus * bus,int phy_id,int idx,u16 regval)298 static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
299 u16 regval)
300 {
301 struct usbnet *dev = bus->priv;
302
303 __smsc95xx_mdio_write(dev, phy_id, idx, regval, 0);
304 return 0;
305 }
306
smsc95xx_wait_eeprom(struct usbnet * dev)307 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
308 {
309 unsigned long start_time = jiffies;
310 u32 val;
311 int ret;
312
313 do {
314 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
315 if (ret < 0) {
316 netdev_warn(dev->net, "Error reading E2P_CMD\n");
317 return ret;
318 }
319
320 if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
321 break;
322 udelay(40);
323 } while (!time_after(jiffies, start_time + HZ));
324
325 if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
326 netdev_warn(dev->net, "EEPROM read operation timeout\n");
327 return -EIO;
328 }
329
330 return 0;
331 }
332
smsc95xx_eeprom_confirm_not_busy(struct usbnet * dev)333 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
334 {
335 unsigned long start_time = jiffies;
336 u32 val;
337 int ret;
338
339 do {
340 ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
341 if (ret < 0) {
342 netdev_warn(dev->net, "Error reading E2P_CMD\n");
343 return ret;
344 }
345
346 if (!(val & E2P_CMD_BUSY_))
347 return 0;
348
349 udelay(40);
350 } while (!time_after(jiffies, start_time + HZ));
351
352 netdev_warn(dev->net, "EEPROM is busy\n");
353 return -EIO;
354 }
355
smsc95xx_read_eeprom(struct usbnet * dev,u32 offset,u32 length,u8 * data)356 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
357 u8 *data)
358 {
359 u32 val;
360 int i, ret;
361
362 BUG_ON(!dev);
363 BUG_ON(!data);
364
365 ret = smsc95xx_eeprom_confirm_not_busy(dev);
366 if (ret)
367 return ret;
368
369 for (i = 0; i < length; i++) {
370 val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
371 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
372 if (ret < 0) {
373 netdev_warn(dev->net, "Error writing E2P_CMD\n");
374 return ret;
375 }
376
377 ret = smsc95xx_wait_eeprom(dev);
378 if (ret < 0)
379 return ret;
380
381 ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
382 if (ret < 0) {
383 netdev_warn(dev->net, "Error reading E2P_DATA\n");
384 return ret;
385 }
386
387 data[i] = val & 0xFF;
388 offset++;
389 }
390
391 return 0;
392 }
393
smsc95xx_write_eeprom(struct usbnet * dev,u32 offset,u32 length,u8 * data)394 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
395 u8 *data)
396 {
397 u32 val;
398 int i, ret;
399
400 BUG_ON(!dev);
401 BUG_ON(!data);
402
403 ret = smsc95xx_eeprom_confirm_not_busy(dev);
404 if (ret)
405 return ret;
406
407 /* Issue write/erase enable command */
408 val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
409 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
410 if (ret < 0) {
411 netdev_warn(dev->net, "Error writing E2P_DATA\n");
412 return ret;
413 }
414
415 ret = smsc95xx_wait_eeprom(dev);
416 if (ret < 0)
417 return ret;
418
419 for (i = 0; i < length; i++) {
420
421 /* Fill data register */
422 val = data[i];
423 ret = smsc95xx_write_reg(dev, E2P_DATA, val);
424 if (ret < 0) {
425 netdev_warn(dev->net, "Error writing E2P_DATA\n");
426 return ret;
427 }
428
429 /* Send "write" command */
430 val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
431 ret = smsc95xx_write_reg(dev, E2P_CMD, val);
432 if (ret < 0) {
433 netdev_warn(dev->net, "Error writing E2P_CMD\n");
434 return ret;
435 }
436
437 ret = smsc95xx_wait_eeprom(dev);
438 if (ret < 0)
439 return ret;
440
441 offset++;
442 }
443
444 return 0;
445 }
446
smsc95xx_write_reg_async(struct usbnet * dev,u16 index,u32 data)447 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
448 u32 data)
449 {
450 const u16 size = 4;
451 u32 buf;
452 int ret;
453
454 buf = data;
455 cpu_to_le32s(&buf);
456
457 ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
458 USB_DIR_OUT | USB_TYPE_VENDOR |
459 USB_RECIP_DEVICE,
460 0, index, &buf, size);
461 if (ret < 0)
462 netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
463 ret);
464 return ret;
465 }
466
467 /* returns hash bit number for given MAC address
468 * example:
469 * 01 00 5E 00 00 01 -> returns bit number 31 */
smsc95xx_hash(char addr[ETH_ALEN])470 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
471 {
472 return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
473 }
474
smsc95xx_set_multicast(struct net_device * netdev)475 static void smsc95xx_set_multicast(struct net_device *netdev)
476 {
477 struct usbnet *dev = netdev_priv(netdev);
478 struct smsc95xx_priv *pdata = dev->driver_priv;
479 unsigned long flags;
480 int ret;
481
482 pdata->hash_hi = 0;
483 pdata->hash_lo = 0;
484
485 spin_lock_irqsave(&pdata->mac_cr_lock, flags);
486
487 if (dev->net->flags & IFF_PROMISC) {
488 netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
489 pdata->mac_cr |= MAC_CR_PRMS_;
490 pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
491 } else if (dev->net->flags & IFF_ALLMULTI) {
492 netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
493 pdata->mac_cr |= MAC_CR_MCPAS_;
494 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
495 } else if (!netdev_mc_empty(dev->net)) {
496 struct netdev_hw_addr *ha;
497
498 pdata->mac_cr |= MAC_CR_HPFILT_;
499 pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
500
501 netdev_for_each_mc_addr(ha, netdev) {
502 u32 bitnum = smsc95xx_hash(ha->addr);
503 u32 mask = 0x01 << (bitnum & 0x1F);
504 if (bitnum & 0x20)
505 pdata->hash_hi |= mask;
506 else
507 pdata->hash_lo |= mask;
508 }
509
510 netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
511 pdata->hash_hi, pdata->hash_lo);
512 } else {
513 netif_dbg(dev, drv, dev->net, "receive own packets only\n");
514 pdata->mac_cr &=
515 ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
516 }
517
518 spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
519
520 /* Initiate async writes, as we can't wait for completion here */
521 ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
522 if (ret < 0)
523 netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
524
525 ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
526 if (ret < 0)
527 netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
528
529 ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
530 if (ret < 0)
531 netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
532 }
533
smsc95xx_phy_update_flowcontrol(struct usbnet * dev)534 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev)
535 {
536 u32 flow = 0, afc_cfg;
537 struct smsc95xx_priv *pdata = dev->driver_priv;
538 bool tx_pause, rx_pause;
539
540 int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
541 if (ret < 0)
542 return ret;
543
544 if (pdata->phydev->duplex == DUPLEX_FULL) {
545 phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
546
547 if (rx_pause)
548 flow = 0xFFFF0002;
549
550 if (tx_pause) {
551 afc_cfg |= 0xF;
552 flow |= 0xFFFF0000;
553 } else {
554 afc_cfg &= ~0xF;
555 }
556
557 netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
558 rx_pause ? "enabled" : "disabled",
559 tx_pause ? "enabled" : "disabled");
560 } else {
561 netif_dbg(dev, link, dev->net, "half duplex\n");
562 afc_cfg |= 0xF;
563 }
564
565 ret = smsc95xx_write_reg(dev, FLOW, flow);
566 if (ret < 0)
567 return ret;
568
569 return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
570 }
571
smsc95xx_mac_update_fullduplex(struct usbnet * dev)572 static void smsc95xx_mac_update_fullduplex(struct usbnet *dev)
573 {
574 struct smsc95xx_priv *pdata = dev->driver_priv;
575 unsigned long flags;
576 int ret;
577
578 spin_lock_irqsave(&pdata->mac_cr_lock, flags);
579 if (pdata->phydev->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 if (ret != -ENODEV)
591 netdev_warn(dev->net,
592 "Error updating MAC full duplex mode\n");
593 return;
594 }
595
596 ret = smsc95xx_phy_update_flowcontrol(dev);
597 if (ret < 0)
598 netdev_warn(dev->net, "Error updating PHY flow control\n");
599 }
600
smsc95xx_status(struct usbnet * dev,struct urb * urb)601 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
602 {
603 u32 intdata;
604
605 if (urb->actual_length != 4) {
606 netdev_warn(dev->net, "unexpected urb length %d\n",
607 urb->actual_length);
608 return;
609 }
610
611 intdata = get_unaligned_le32(urb->transfer_buffer);
612 netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
613
614 if (intdata & INT_ENP_PHY_INT_)
615 ;
616 else
617 netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
618 intdata);
619 }
620
621 /* Enable or disable Tx & Rx checksum offload engines */
smsc95xx_set_features(struct net_device * netdev,netdev_features_t features)622 static int smsc95xx_set_features(struct net_device *netdev,
623 netdev_features_t features)
624 {
625 struct usbnet *dev = netdev_priv(netdev);
626 u32 read_buf;
627 int ret;
628
629 ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
630 if (ret < 0)
631 return ret;
632
633 if (features & NETIF_F_IP_CSUM)
634 read_buf |= Tx_COE_EN_;
635 else
636 read_buf &= ~Tx_COE_EN_;
637
638 if (features & NETIF_F_RXCSUM)
639 read_buf |= Rx_COE_EN_;
640 else
641 read_buf &= ~Rx_COE_EN_;
642
643 ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
644 if (ret < 0)
645 return ret;
646
647 netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
648 return 0;
649 }
650
smsc95xx_ethtool_get_eeprom_len(struct net_device * net)651 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
652 {
653 return MAX_EEPROM_SIZE;
654 }
655
smsc95xx_ethtool_get_eeprom(struct net_device * netdev,struct ethtool_eeprom * ee,u8 * data)656 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
657 struct ethtool_eeprom *ee, u8 *data)
658 {
659 struct usbnet *dev = netdev_priv(netdev);
660
661 ee->magic = LAN95XX_EEPROM_MAGIC;
662
663 return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
664 }
665
smsc95xx_ethtool_set_eeprom(struct net_device * netdev,struct ethtool_eeprom * ee,u8 * data)666 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
667 struct ethtool_eeprom *ee, u8 *data)
668 {
669 struct usbnet *dev = netdev_priv(netdev);
670
671 if (ee->magic != LAN95XX_EEPROM_MAGIC) {
672 netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
673 ee->magic);
674 return -EINVAL;
675 }
676
677 return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
678 }
679
smsc95xx_ethtool_getregslen(struct net_device * netdev)680 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
681 {
682 /* all smsc95xx registers */
683 return COE_CR - ID_REV + sizeof(u32);
684 }
685
686 static void
smsc95xx_ethtool_getregs(struct net_device * netdev,struct ethtool_regs * regs,void * buf)687 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
688 void *buf)
689 {
690 struct usbnet *dev = netdev_priv(netdev);
691 unsigned int i, j;
692 int retval;
693 u32 *data = buf;
694
695 retval = smsc95xx_read_reg(dev, ID_REV, ®s->version);
696 if (retval < 0) {
697 netdev_warn(netdev, "REGS: cannot read ID_REV\n");
698 return;
699 }
700
701 for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
702 retval = smsc95xx_read_reg(dev, i, &data[j]);
703 if (retval < 0) {
704 netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
705 return;
706 }
707 }
708 }
709
smsc95xx_ethtool_get_wol(struct net_device * net,struct ethtool_wolinfo * wolinfo)710 static void smsc95xx_ethtool_get_wol(struct net_device *net,
711 struct ethtool_wolinfo *wolinfo)
712 {
713 struct usbnet *dev = netdev_priv(net);
714 struct smsc95xx_priv *pdata = dev->driver_priv;
715
716 wolinfo->supported = SUPPORTED_WAKE;
717 wolinfo->wolopts = pdata->wolopts;
718 }
719
smsc95xx_ethtool_set_wol(struct net_device * net,struct ethtool_wolinfo * wolinfo)720 static int smsc95xx_ethtool_set_wol(struct net_device *net,
721 struct ethtool_wolinfo *wolinfo)
722 {
723 struct usbnet *dev = netdev_priv(net);
724 struct smsc95xx_priv *pdata = dev->driver_priv;
725 int ret;
726
727 if (wolinfo->wolopts & ~SUPPORTED_WAKE)
728 return -EINVAL;
729
730 pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
731
732 ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
733 if (ret < 0)
734 netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
735
736 return ret;
737 }
738
smsc95xx_get_link(struct net_device * net)739 static u32 smsc95xx_get_link(struct net_device *net)
740 {
741 phy_read_status(net->phydev);
742 return net->phydev->link;
743 }
744
745 static const struct ethtool_ops smsc95xx_ethtool_ops = {
746 .get_link = smsc95xx_get_link,
747 .nway_reset = phy_ethtool_nway_reset,
748 .get_drvinfo = usbnet_get_drvinfo,
749 .get_msglevel = usbnet_get_msglevel,
750 .set_msglevel = usbnet_set_msglevel,
751 .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
752 .get_eeprom = smsc95xx_ethtool_get_eeprom,
753 .set_eeprom = smsc95xx_ethtool_set_eeprom,
754 .get_regs_len = smsc95xx_ethtool_getregslen,
755 .get_regs = smsc95xx_ethtool_getregs,
756 .get_wol = smsc95xx_ethtool_get_wol,
757 .set_wol = smsc95xx_ethtool_set_wol,
758 .get_link_ksettings = phy_ethtool_get_link_ksettings,
759 .set_link_ksettings = phy_ethtool_set_link_ksettings,
760 .get_ts_info = ethtool_op_get_ts_info,
761 };
762
smsc95xx_ioctl(struct net_device * netdev,struct ifreq * rq,int cmd)763 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
764 {
765 if (!netif_running(netdev))
766 return -EINVAL;
767
768 return phy_mii_ioctl(netdev->phydev, rq, cmd);
769 }
770
smsc95xx_init_mac_address(struct usbnet * dev)771 static void smsc95xx_init_mac_address(struct usbnet *dev)
772 {
773 /* maybe the boot loader passed the MAC address in devicetree */
774 if (!eth_platform_get_mac_address(&dev->udev->dev,
775 dev->net->dev_addr)) {
776 if (is_valid_ether_addr(dev->net->dev_addr)) {
777 /* device tree values are valid so use them */
778 netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
779 return;
780 }
781 }
782
783 /* try reading mac address from EEPROM */
784 if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN,
785 dev->net->dev_addr) == 0) {
786 if (is_valid_ether_addr(dev->net->dev_addr)) {
787 /* eeprom values are valid so use them */
788 netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
789 return;
790 }
791 }
792
793 /* no useful static MAC address found. generate a random one */
794 eth_hw_addr_random(dev->net);
795 netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
796 }
797
smsc95xx_set_mac_address(struct usbnet * dev)798 static int smsc95xx_set_mac_address(struct usbnet *dev)
799 {
800 u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
801 dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
802 u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
803 int ret;
804
805 ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
806 if (ret < 0)
807 return ret;
808
809 return smsc95xx_write_reg(dev, ADDRH, addr_hi);
810 }
811
812 /* starts the TX path */
smsc95xx_start_tx_path(struct usbnet * dev)813 static int smsc95xx_start_tx_path(struct usbnet *dev)
814 {
815 struct smsc95xx_priv *pdata = dev->driver_priv;
816 unsigned long flags;
817 int ret;
818
819 /* Enable Tx at MAC */
820 spin_lock_irqsave(&pdata->mac_cr_lock, flags);
821 pdata->mac_cr |= MAC_CR_TXEN_;
822 spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
823
824 ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
825 if (ret < 0)
826 return ret;
827
828 /* Enable Tx at SCSRs */
829 return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
830 }
831
832 /* Starts the Receive path */
smsc95xx_start_rx_path(struct usbnet * dev,int in_pm)833 static int smsc95xx_start_rx_path(struct usbnet *dev, int in_pm)
834 {
835 struct smsc95xx_priv *pdata = dev->driver_priv;
836 unsigned long flags;
837
838 spin_lock_irqsave(&pdata->mac_cr_lock, flags);
839 pdata->mac_cr |= MAC_CR_RXEN_;
840 spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
841
842 return __smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr, in_pm);
843 }
844
smsc95xx_reset(struct usbnet * dev)845 static int smsc95xx_reset(struct usbnet *dev)
846 {
847 struct smsc95xx_priv *pdata = dev->driver_priv;
848 u32 read_buf, write_buf, burst_cap;
849 int ret = 0, timeout;
850
851 netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
852
853 ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
854 if (ret < 0)
855 return ret;
856
857 timeout = 0;
858 do {
859 msleep(10);
860 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
861 if (ret < 0)
862 return ret;
863 timeout++;
864 } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
865
866 if (timeout >= 100) {
867 netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
868 return -ETIMEDOUT;
869 }
870
871 ret = smsc95xx_write_reg(dev, PM_CTRL, PM_CTL_PHY_RST_);
872 if (ret < 0)
873 return ret;
874
875 timeout = 0;
876 do {
877 msleep(10);
878 ret = smsc95xx_read_reg(dev, PM_CTRL, &read_buf);
879 if (ret < 0)
880 return ret;
881 timeout++;
882 } while ((read_buf & PM_CTL_PHY_RST_) && (timeout < 100));
883
884 if (timeout >= 100) {
885 netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
886 return ret;
887 }
888
889 ret = smsc95xx_set_mac_address(dev);
890 if (ret < 0)
891 return ret;
892
893 netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
894 dev->net->dev_addr);
895
896 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
897 if (ret < 0)
898 return ret;
899
900 netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
901 read_buf);
902
903 read_buf |= HW_CFG_BIR_;
904
905 ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
906 if (ret < 0)
907 return ret;
908
909 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
910 if (ret < 0)
911 return ret;
912
913 netif_dbg(dev, ifup, dev->net,
914 "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
915 read_buf);
916
917 if (!turbo_mode) {
918 burst_cap = 0;
919 dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
920 } else if (dev->udev->speed == USB_SPEED_HIGH) {
921 burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
922 dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
923 } else {
924 burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
925 dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
926 }
927
928 netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
929 (ulong)dev->rx_urb_size);
930
931 ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
932 if (ret < 0)
933 return ret;
934
935 ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
936 if (ret < 0)
937 return ret;
938
939 netif_dbg(dev, ifup, dev->net,
940 "Read Value from BURST_CAP after writing: 0x%08x\n",
941 read_buf);
942
943 ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
944 if (ret < 0)
945 return ret;
946
947 ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
948 if (ret < 0)
949 return ret;
950
951 netif_dbg(dev, ifup, dev->net,
952 "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
953 read_buf);
954
955 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
956 if (ret < 0)
957 return ret;
958
959 netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
960 read_buf);
961
962 if (turbo_mode)
963 read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
964
965 read_buf &= ~HW_CFG_RXDOFF_;
966
967 /* set Rx data offset=2, Make IP header aligns on word boundary. */
968 read_buf |= NET_IP_ALIGN << 9;
969
970 ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
971 if (ret < 0)
972 return ret;
973
974 ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
975 if (ret < 0)
976 return ret;
977
978 netif_dbg(dev, ifup, dev->net,
979 "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
980
981 ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
982 if (ret < 0)
983 return ret;
984
985 ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
986 if (ret < 0)
987 return ret;
988 netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
989
990 /* Configure GPIO pins as LED outputs */
991 write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
992 LED_GPIO_CFG_FDX_LED;
993 ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
994 if (ret < 0)
995 return ret;
996
997 /* Init Tx */
998 ret = smsc95xx_write_reg(dev, FLOW, 0);
999 if (ret < 0)
1000 return ret;
1001
1002 ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
1003 if (ret < 0)
1004 return ret;
1005
1006 /* Don't need mac_cr_lock during initialisation */
1007 ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
1008 if (ret < 0)
1009 return ret;
1010
1011 /* Init Rx */
1012 /* Set Vlan */
1013 ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
1014 if (ret < 0)
1015 return ret;
1016
1017 /* Enable or disable checksum offload engines */
1018 ret = smsc95xx_set_features(dev->net, dev->net->features);
1019 if (ret < 0) {
1020 netdev_warn(dev->net, "Failed to set checksum offload features\n");
1021 return ret;
1022 }
1023
1024 smsc95xx_set_multicast(dev->net);
1025
1026 ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1027 if (ret < 0)
1028 return ret;
1029
1030 /* enable PHY interrupts */
1031 read_buf |= INT_EP_CTL_PHY_INT_;
1032
1033 ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1034 if (ret < 0)
1035 return ret;
1036
1037 ret = smsc95xx_start_tx_path(dev);
1038 if (ret < 0) {
1039 netdev_warn(dev->net, "Failed to start TX path\n");
1040 return ret;
1041 }
1042
1043 ret = smsc95xx_start_rx_path(dev, 0);
1044 if (ret < 0) {
1045 netdev_warn(dev->net, "Failed to start RX path\n");
1046 return ret;
1047 }
1048
1049 netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1050 return 0;
1051 }
1052
1053 static const struct net_device_ops smsc95xx_netdev_ops = {
1054 .ndo_open = usbnet_open,
1055 .ndo_stop = usbnet_stop,
1056 .ndo_start_xmit = usbnet_start_xmit,
1057 .ndo_tx_timeout = usbnet_tx_timeout,
1058 .ndo_change_mtu = usbnet_change_mtu,
1059 .ndo_get_stats64 = usbnet_get_stats64,
1060 .ndo_set_mac_address = eth_mac_addr,
1061 .ndo_validate_addr = eth_validate_addr,
1062 .ndo_do_ioctl = smsc95xx_ioctl,
1063 .ndo_set_rx_mode = smsc95xx_set_multicast,
1064 .ndo_set_features = smsc95xx_set_features,
1065 };
1066
smsc95xx_handle_link_change(struct net_device * net)1067 static void smsc95xx_handle_link_change(struct net_device *net)
1068 {
1069 struct usbnet *dev = netdev_priv(net);
1070
1071 phy_print_status(net->phydev);
1072 smsc95xx_mac_update_fullduplex(dev);
1073 usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1074 }
1075
smsc95xx_bind(struct usbnet * dev,struct usb_interface * intf)1076 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1077 {
1078 struct smsc95xx_priv *pdata;
1079 bool is_internal_phy;
1080 u32 val;
1081 int ret;
1082
1083 printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1084
1085 ret = usbnet_get_endpoints(dev, intf);
1086 if (ret < 0) {
1087 netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1088 return ret;
1089 }
1090
1091 pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1092 if (!pdata)
1093 return -ENOMEM;
1094
1095 dev->driver_priv = pdata;
1096
1097 spin_lock_init(&pdata->mac_cr_lock);
1098
1099 /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1100 * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1101 * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1102 * it is transmitted as all ones. The zero transmitted checksum means
1103 * transmitter generated no checksum. Hence, enable csum offload only
1104 * for ipv4 packets.
1105 */
1106 if (DEFAULT_TX_CSUM_ENABLE)
1107 dev->net->features |= NETIF_F_IP_CSUM;
1108 if (DEFAULT_RX_CSUM_ENABLE)
1109 dev->net->features |= NETIF_F_RXCSUM;
1110
1111 dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1112 set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1113
1114 smsc95xx_init_mac_address(dev);
1115
1116 /* Init all registers */
1117 ret = smsc95xx_reset(dev);
1118 if (ret)
1119 goto free_pdata;
1120
1121 pdata->mdiobus = mdiobus_alloc();
1122 if (!pdata->mdiobus) {
1123 ret = -ENOMEM;
1124 goto free_pdata;
1125 }
1126
1127 ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1128 if (ret < 0)
1129 goto free_mdio;
1130
1131 is_internal_phy = !(val & HW_CFG_PSEL_);
1132 if (is_internal_phy)
1133 pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1134
1135 pdata->mdiobus->priv = dev;
1136 pdata->mdiobus->read = smsc95xx_mdiobus_read;
1137 pdata->mdiobus->write = smsc95xx_mdiobus_write;
1138 pdata->mdiobus->name = "smsc95xx-mdiobus";
1139 pdata->mdiobus->parent = &dev->udev->dev;
1140
1141 snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1142 "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1143
1144 ret = mdiobus_register(pdata->mdiobus);
1145 if (ret) {
1146 netdev_err(dev->net, "Could not register MDIO bus\n");
1147 goto free_mdio;
1148 }
1149
1150 pdata->phydev = phy_find_first(pdata->mdiobus);
1151 if (!pdata->phydev) {
1152 netdev_err(dev->net, "no PHY found\n");
1153 ret = -ENODEV;
1154 goto unregister_mdio;
1155 }
1156
1157 pdata->phydev->is_internal = is_internal_phy;
1158
1159 /* detect device revision as different features may be available */
1160 ret = smsc95xx_read_reg(dev, ID_REV, &val);
1161 if (ret < 0)
1162 goto unregister_mdio;
1163
1164 val >>= 16;
1165 if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1166 (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1167 pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1168 FEATURE_PHY_NLP_CROSSOVER |
1169 FEATURE_REMOTE_WAKEUP);
1170 else if (val == ID_REV_CHIP_ID_9512_)
1171 pdata->features = FEATURE_8_WAKEUP_FILTERS;
1172
1173 dev->net->netdev_ops = &smsc95xx_netdev_ops;
1174 dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1175 dev->net->flags |= IFF_MULTICAST;
1176 dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1177 dev->net->min_mtu = ETH_MIN_MTU;
1178 dev->net->max_mtu = ETH_DATA_LEN;
1179 dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1180
1181 ret = phy_connect_direct(dev->net, pdata->phydev,
1182 &smsc95xx_handle_link_change,
1183 PHY_INTERFACE_MODE_MII);
1184 if (ret) {
1185 netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1186 goto unregister_mdio;
1187 }
1188
1189 phy_attached_info(dev->net->phydev);
1190
1191 return 0;
1192
1193 unregister_mdio:
1194 mdiobus_unregister(pdata->mdiobus);
1195
1196 free_mdio:
1197 mdiobus_free(pdata->mdiobus);
1198
1199 free_pdata:
1200 kfree(pdata);
1201 return ret;
1202 }
1203
smsc95xx_unbind(struct usbnet * dev,struct usb_interface * intf)1204 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1205 {
1206 struct smsc95xx_priv *pdata = dev->driver_priv;
1207
1208 phy_disconnect(dev->net->phydev);
1209 mdiobus_unregister(pdata->mdiobus);
1210 mdiobus_free(pdata->mdiobus);
1211 netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1212 kfree(pdata);
1213 }
1214
smsc95xx_start_phy(struct usbnet * dev)1215 static int smsc95xx_start_phy(struct usbnet *dev)
1216 {
1217 phy_start(dev->net->phydev);
1218
1219 return 0;
1220 }
1221
smsc95xx_stop(struct usbnet * dev)1222 static int smsc95xx_stop(struct usbnet *dev)
1223 {
1224 if (dev->net->phydev)
1225 phy_stop(dev->net->phydev);
1226
1227 return 0;
1228 }
1229
smsc_crc(const u8 * buffer,size_t len,int filter)1230 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1231 {
1232 u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1233 return crc << ((filter % 2) * 16);
1234 }
1235
smsc95xx_enable_phy_wakeup_interrupts(struct usbnet * dev,u16 mask)1236 static int smsc95xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
1237 {
1238 int ret;
1239
1240 netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
1241
1242 /* read to clear */
1243 ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_SRC);
1244 if (ret < 0)
1245 return ret;
1246
1247 /* enable interrupt source */
1248 ret = smsc95xx_mdio_read_nopm(dev, PHY_INT_MASK);
1249 if (ret < 0)
1250 return ret;
1251
1252 ret |= mask;
1253
1254 smsc95xx_mdio_write_nopm(dev, PHY_INT_MASK, ret);
1255
1256 return 0;
1257 }
1258
smsc95xx_link_ok_nopm(struct usbnet * dev)1259 static int smsc95xx_link_ok_nopm(struct usbnet *dev)
1260 {
1261 int ret;
1262
1263 /* first, a dummy read, needed to latch some MII phys */
1264 ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1265 if (ret < 0)
1266 return ret;
1267
1268 ret = smsc95xx_mdio_read_nopm(dev, MII_BMSR);
1269 if (ret < 0)
1270 return ret;
1271
1272 return !!(ret & BMSR_LSTATUS);
1273 }
1274
smsc95xx_enter_suspend0(struct usbnet * dev)1275 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1276 {
1277 struct smsc95xx_priv *pdata = dev->driver_priv;
1278 u32 val;
1279 int ret;
1280
1281 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1282 if (ret < 0)
1283 return ret;
1284
1285 val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1286 val |= PM_CTL_SUS_MODE_0;
1287
1288 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1289 if (ret < 0)
1290 return ret;
1291
1292 /* clear wol status */
1293 val &= ~PM_CTL_WUPS_;
1294 val |= PM_CTL_WUPS_WOL_;
1295
1296 /* enable energy detection */
1297 if (pdata->wolopts & WAKE_PHY)
1298 val |= PM_CTL_WUPS_ED_;
1299
1300 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1301 if (ret < 0)
1302 return ret;
1303
1304 /* read back PM_CTRL */
1305 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1306 if (ret < 0)
1307 return ret;
1308
1309 pdata->suspend_flags |= SUSPEND_SUSPEND0;
1310
1311 return 0;
1312 }
1313
smsc95xx_enter_suspend1(struct usbnet * dev)1314 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1315 {
1316 struct smsc95xx_priv *pdata = dev->driver_priv;
1317 u32 val;
1318 int ret;
1319
1320 /* reconfigure link pulse detection timing for
1321 * compatibility with non-standard link partners
1322 */
1323 if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1324 smsc95xx_mdio_write_nopm(dev, PHY_EDPD_CONFIG,
1325 PHY_EDPD_CONFIG_DEFAULT);
1326
1327 /* enable energy detect power-down mode */
1328 ret = smsc95xx_mdio_read_nopm(dev, PHY_MODE_CTRL_STS);
1329 if (ret < 0)
1330 return ret;
1331
1332 ret |= MODE_CTRL_STS_EDPWRDOWN_;
1333
1334 smsc95xx_mdio_write_nopm(dev, PHY_MODE_CTRL_STS, ret);
1335
1336 /* enter SUSPEND1 mode */
1337 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1338 if (ret < 0)
1339 return ret;
1340
1341 val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1342 val |= PM_CTL_SUS_MODE_1;
1343
1344 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1345 if (ret < 0)
1346 return ret;
1347
1348 /* clear wol status, enable energy detection */
1349 val &= ~PM_CTL_WUPS_;
1350 val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1351
1352 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1353 if (ret < 0)
1354 return ret;
1355
1356 pdata->suspend_flags |= SUSPEND_SUSPEND1;
1357
1358 return 0;
1359 }
1360
smsc95xx_enter_suspend2(struct usbnet * dev)1361 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1362 {
1363 struct smsc95xx_priv *pdata = dev->driver_priv;
1364 u32 val;
1365 int ret;
1366
1367 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1368 if (ret < 0)
1369 return ret;
1370
1371 val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1372 val |= PM_CTL_SUS_MODE_2;
1373
1374 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1375 if (ret < 0)
1376 return ret;
1377
1378 pdata->suspend_flags |= SUSPEND_SUSPEND2;
1379
1380 return 0;
1381 }
1382
smsc95xx_enter_suspend3(struct usbnet * dev)1383 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1384 {
1385 struct smsc95xx_priv *pdata = dev->driver_priv;
1386 u32 val;
1387 int ret;
1388
1389 ret = smsc95xx_read_reg_nopm(dev, RX_FIFO_INF, &val);
1390 if (ret < 0)
1391 return ret;
1392
1393 if (val & RX_FIFO_INF_USED_) {
1394 netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1395 return -EBUSY;
1396 }
1397
1398 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1399 if (ret < 0)
1400 return ret;
1401
1402 val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1403 val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1404
1405 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1406 if (ret < 0)
1407 return ret;
1408
1409 /* clear wol status */
1410 val &= ~PM_CTL_WUPS_;
1411 val |= PM_CTL_WUPS_WOL_;
1412
1413 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1414 if (ret < 0)
1415 return ret;
1416
1417 pdata->suspend_flags |= SUSPEND_SUSPEND3;
1418
1419 return 0;
1420 }
1421
smsc95xx_autosuspend(struct usbnet * dev,u32 link_up)1422 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1423 {
1424 struct smsc95xx_priv *pdata = dev->driver_priv;
1425 int ret;
1426
1427 if (!netif_running(dev->net)) {
1428 /* interface is ifconfig down so fully power down hw */
1429 netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1430 return smsc95xx_enter_suspend2(dev);
1431 }
1432
1433 if (!link_up) {
1434 /* link is down so enter EDPD mode, but only if device can
1435 * reliably resume from it. This check should be redundant
1436 * as current FEATURE_REMOTE_WAKEUP parts also support
1437 * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1438 if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1439 netdev_warn(dev->net, "EDPD not supported\n");
1440 return -EBUSY;
1441 }
1442
1443 netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1444
1445 /* enable PHY wakeup events for if cable is attached */
1446 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1447 PHY_INT_MASK_ANEG_COMP_);
1448 if (ret < 0) {
1449 netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1450 return ret;
1451 }
1452
1453 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1454 return smsc95xx_enter_suspend1(dev);
1455 }
1456
1457 /* enable PHY wakeup events so we remote wakeup if cable is pulled */
1458 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1459 PHY_INT_MASK_LINK_DOWN_);
1460 if (ret < 0) {
1461 netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1462 return ret;
1463 }
1464
1465 netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1466 return smsc95xx_enter_suspend3(dev);
1467 }
1468
smsc95xx_suspend(struct usb_interface * intf,pm_message_t message)1469 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1470 {
1471 struct usbnet *dev = usb_get_intfdata(intf);
1472 struct smsc95xx_priv *pdata = dev->driver_priv;
1473 u32 val, link_up;
1474 int ret;
1475
1476 pdata->pm_task = current;
1477
1478 ret = usbnet_suspend(intf, message);
1479 if (ret < 0) {
1480 netdev_warn(dev->net, "usbnet_suspend error\n");
1481 pdata->pm_task = NULL;
1482 return ret;
1483 }
1484
1485 if (pdata->suspend_flags) {
1486 netdev_warn(dev->net, "error during last resume\n");
1487 pdata->suspend_flags = 0;
1488 }
1489
1490 /* determine if link is up using only _nopm functions */
1491 link_up = smsc95xx_link_ok_nopm(dev);
1492
1493 if (message.event == PM_EVENT_AUTO_SUSPEND &&
1494 (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1495 ret = smsc95xx_autosuspend(dev, link_up);
1496 goto done;
1497 }
1498
1499 /* if we get this far we're not autosuspending */
1500 /* if no wol options set, or if link is down and we're not waking on
1501 * PHY activity, enter lowest power SUSPEND2 mode
1502 */
1503 if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1504 !(link_up || (pdata->wolopts & WAKE_PHY))) {
1505 netdev_info(dev->net, "entering SUSPEND2 mode\n");
1506
1507 /* disable energy detect (link up) & wake up events */
1508 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1509 if (ret < 0)
1510 goto done;
1511
1512 val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1513
1514 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1515 if (ret < 0)
1516 goto done;
1517
1518 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1519 if (ret < 0)
1520 goto done;
1521
1522 val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1523
1524 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1525 if (ret < 0)
1526 goto done;
1527
1528 ret = smsc95xx_enter_suspend2(dev);
1529 goto done;
1530 }
1531
1532 if (pdata->wolopts & WAKE_PHY) {
1533 ret = smsc95xx_enable_phy_wakeup_interrupts(dev,
1534 (PHY_INT_MASK_ANEG_COMP_ | PHY_INT_MASK_LINK_DOWN_));
1535 if (ret < 0) {
1536 netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1537 goto done;
1538 }
1539
1540 /* if link is down then configure EDPD and enter SUSPEND1,
1541 * otherwise enter SUSPEND0 below
1542 */
1543 if (!link_up) {
1544 netdev_info(dev->net, "entering SUSPEND1 mode\n");
1545 ret = smsc95xx_enter_suspend1(dev);
1546 goto done;
1547 }
1548 }
1549
1550 if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1551 u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1552 u32 command[2];
1553 u32 offset[2];
1554 u32 crc[4];
1555 int wuff_filter_count =
1556 (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1557 LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1558 int i, filter = 0;
1559
1560 if (!filter_mask) {
1561 netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1562 ret = -ENOMEM;
1563 goto done;
1564 }
1565
1566 memset(command, 0, sizeof(command));
1567 memset(offset, 0, sizeof(offset));
1568 memset(crc, 0, sizeof(crc));
1569
1570 if (pdata->wolopts & WAKE_BCAST) {
1571 const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1572 netdev_info(dev->net, "enabling broadcast detection\n");
1573 filter_mask[filter * 4] = 0x003F;
1574 filter_mask[filter * 4 + 1] = 0x00;
1575 filter_mask[filter * 4 + 2] = 0x00;
1576 filter_mask[filter * 4 + 3] = 0x00;
1577 command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1578 offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1579 crc[filter/2] |= smsc_crc(bcast, 6, filter);
1580 filter++;
1581 }
1582
1583 if (pdata->wolopts & WAKE_MCAST) {
1584 const u8 mcast[] = {0x01, 0x00, 0x5E};
1585 netdev_info(dev->net, "enabling multicast detection\n");
1586 filter_mask[filter * 4] = 0x0007;
1587 filter_mask[filter * 4 + 1] = 0x00;
1588 filter_mask[filter * 4 + 2] = 0x00;
1589 filter_mask[filter * 4 + 3] = 0x00;
1590 command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1591 offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1592 crc[filter/2] |= smsc_crc(mcast, 3, filter);
1593 filter++;
1594 }
1595
1596 if (pdata->wolopts & WAKE_ARP) {
1597 const u8 arp[] = {0x08, 0x06};
1598 netdev_info(dev->net, "enabling ARP detection\n");
1599 filter_mask[filter * 4] = 0x0003;
1600 filter_mask[filter * 4 + 1] = 0x00;
1601 filter_mask[filter * 4 + 2] = 0x00;
1602 filter_mask[filter * 4 + 3] = 0x00;
1603 command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1604 offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1605 crc[filter/2] |= smsc_crc(arp, 2, filter);
1606 filter++;
1607 }
1608
1609 if (pdata->wolopts & WAKE_UCAST) {
1610 netdev_info(dev->net, "enabling unicast detection\n");
1611 filter_mask[filter * 4] = 0x003F;
1612 filter_mask[filter * 4 + 1] = 0x00;
1613 filter_mask[filter * 4 + 2] = 0x00;
1614 filter_mask[filter * 4 + 3] = 0x00;
1615 command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1616 offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1617 crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1618 filter++;
1619 }
1620
1621 for (i = 0; i < (wuff_filter_count * 4); i++) {
1622 ret = smsc95xx_write_reg_nopm(dev, WUFF, filter_mask[i]);
1623 if (ret < 0) {
1624 kfree(filter_mask);
1625 goto done;
1626 }
1627 }
1628 kfree(filter_mask);
1629
1630 for (i = 0; i < (wuff_filter_count / 4); i++) {
1631 ret = smsc95xx_write_reg_nopm(dev, WUFF, command[i]);
1632 if (ret < 0)
1633 goto done;
1634 }
1635
1636 for (i = 0; i < (wuff_filter_count / 4); i++) {
1637 ret = smsc95xx_write_reg_nopm(dev, WUFF, offset[i]);
1638 if (ret < 0)
1639 goto done;
1640 }
1641
1642 for (i = 0; i < (wuff_filter_count / 2); i++) {
1643 ret = smsc95xx_write_reg_nopm(dev, WUFF, crc[i]);
1644 if (ret < 0)
1645 goto done;
1646 }
1647
1648 /* clear any pending pattern match packet status */
1649 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1650 if (ret < 0)
1651 goto done;
1652
1653 val |= WUCSR_WUFR_;
1654
1655 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1656 if (ret < 0)
1657 goto done;
1658 }
1659
1660 if (pdata->wolopts & WAKE_MAGIC) {
1661 /* clear any pending magic packet status */
1662 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1663 if (ret < 0)
1664 goto done;
1665
1666 val |= WUCSR_MPR_;
1667
1668 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1669 if (ret < 0)
1670 goto done;
1671 }
1672
1673 /* enable/disable wakeup sources */
1674 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1675 if (ret < 0)
1676 goto done;
1677
1678 if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1679 netdev_info(dev->net, "enabling pattern match wakeup\n");
1680 val |= WUCSR_WAKE_EN_;
1681 } else {
1682 netdev_info(dev->net, "disabling pattern match wakeup\n");
1683 val &= ~WUCSR_WAKE_EN_;
1684 }
1685
1686 if (pdata->wolopts & WAKE_MAGIC) {
1687 netdev_info(dev->net, "enabling magic packet wakeup\n");
1688 val |= WUCSR_MPEN_;
1689 } else {
1690 netdev_info(dev->net, "disabling magic packet wakeup\n");
1691 val &= ~WUCSR_MPEN_;
1692 }
1693
1694 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1695 if (ret < 0)
1696 goto done;
1697
1698 /* enable wol wakeup source */
1699 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1700 if (ret < 0)
1701 goto done;
1702
1703 val |= PM_CTL_WOL_EN_;
1704
1705 /* phy energy detect wakeup source */
1706 if (pdata->wolopts & WAKE_PHY)
1707 val |= PM_CTL_ED_EN_;
1708
1709 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1710 if (ret < 0)
1711 goto done;
1712
1713 /* enable receiver to enable frame reception */
1714 smsc95xx_start_rx_path(dev, 1);
1715
1716 /* some wol options are enabled, so enter SUSPEND0 */
1717 netdev_info(dev->net, "entering SUSPEND0 mode\n");
1718 ret = smsc95xx_enter_suspend0(dev);
1719
1720 done:
1721 /*
1722 * TODO: resume() might need to handle the suspend failure
1723 * in system sleep
1724 */
1725 if (ret && PMSG_IS_AUTO(message))
1726 usbnet_resume(intf);
1727
1728 pdata->pm_task = NULL;
1729 return ret;
1730 }
1731
smsc95xx_resume(struct usb_interface * intf)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 = dev->driver_priv;
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
1749 pdata->pm_task = current;
1750
1751 if (suspend_flags & SUSPEND_ALLMODES) {
1752 /* clear wake-up sources */
1753 ret = smsc95xx_read_reg_nopm(dev, WUCSR, &val);
1754 if (ret < 0)
1755 goto done;
1756
1757 val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1758
1759 ret = smsc95xx_write_reg_nopm(dev, WUCSR, val);
1760 if (ret < 0)
1761 goto done;
1762
1763 /* clear wake-up status */
1764 ret = smsc95xx_read_reg_nopm(dev, PM_CTRL, &val);
1765 if (ret < 0)
1766 goto done;
1767
1768 val &= ~PM_CTL_WOL_EN_;
1769 val |= PM_CTL_WUPS_;
1770
1771 ret = smsc95xx_write_reg_nopm(dev, PM_CTRL, val);
1772 if (ret < 0)
1773 goto done;
1774 }
1775
1776 ret = usbnet_resume(intf);
1777 if (ret < 0)
1778 netdev_warn(dev->net, "usbnet_resume error\n");
1779
1780 phy_init_hw(pdata->phydev);
1781
1782 done:
1783 pdata->pm_task = NULL;
1784 return ret;
1785 }
1786
smsc95xx_reset_resume(struct usb_interface * intf)1787 static int smsc95xx_reset_resume(struct usb_interface *intf)
1788 {
1789 struct usbnet *dev = usb_get_intfdata(intf);
1790 struct smsc95xx_priv *pdata = dev->driver_priv;
1791 int ret;
1792
1793 pdata->pm_task = current;
1794 ret = smsc95xx_reset(dev);
1795 pdata->pm_task = NULL;
1796 if (ret < 0)
1797 return ret;
1798
1799 return smsc95xx_resume(intf);
1800 }
1801
smsc95xx_rx_csum_offload(struct sk_buff * skb)1802 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1803 {
1804 skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1805 skb->ip_summed = CHECKSUM_COMPLETE;
1806 skb_trim(skb, skb->len - 2);
1807 }
1808
smsc95xx_rx_fixup(struct usbnet * dev,struct sk_buff * skb)1809 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1810 {
1811 /* This check is no longer done by usbnet */
1812 if (skb->len < dev->net->hard_header_len)
1813 return 0;
1814
1815 while (skb->len > 0) {
1816 u32 header, align_count;
1817 struct sk_buff *ax_skb;
1818 unsigned char *packet;
1819 u16 size;
1820
1821 header = get_unaligned_le32(skb->data);
1822 skb_pull(skb, 4 + NET_IP_ALIGN);
1823 packet = skb->data;
1824
1825 /* get the packet length */
1826 size = (u16)((header & RX_STS_FL_) >> 16);
1827 align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1828
1829 if (unlikely(size > skb->len)) {
1830 netif_dbg(dev, rx_err, dev->net,
1831 "size err header=0x%08x\n", header);
1832 return 0;
1833 }
1834
1835 if (unlikely(header & RX_STS_ES_)) {
1836 netif_dbg(dev, rx_err, dev->net,
1837 "Error header=0x%08x\n", header);
1838 dev->net->stats.rx_errors++;
1839 dev->net->stats.rx_dropped++;
1840
1841 if (header & RX_STS_CRC_) {
1842 dev->net->stats.rx_crc_errors++;
1843 } else {
1844 if (header & (RX_STS_TL_ | RX_STS_RF_))
1845 dev->net->stats.rx_frame_errors++;
1846
1847 if ((header & RX_STS_LE_) &&
1848 (!(header & RX_STS_FT_)))
1849 dev->net->stats.rx_length_errors++;
1850 }
1851 } else {
1852 /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1853 if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1854 netif_dbg(dev, rx_err, dev->net,
1855 "size err header=0x%08x\n", header);
1856 return 0;
1857 }
1858
1859 /* last frame in this batch */
1860 if (skb->len == size) {
1861 if (dev->net->features & NETIF_F_RXCSUM)
1862 smsc95xx_rx_csum_offload(skb);
1863 skb_trim(skb, skb->len - 4); /* remove fcs */
1864 skb->truesize = size + sizeof(struct sk_buff);
1865
1866 return 1;
1867 }
1868
1869 ax_skb = skb_clone(skb, GFP_ATOMIC);
1870 if (unlikely(!ax_skb)) {
1871 netdev_warn(dev->net, "Error allocating skb\n");
1872 return 0;
1873 }
1874
1875 ax_skb->len = size;
1876 ax_skb->data = packet;
1877 skb_set_tail_pointer(ax_skb, size);
1878
1879 if (dev->net->features & NETIF_F_RXCSUM)
1880 smsc95xx_rx_csum_offload(ax_skb);
1881 skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1882 ax_skb->truesize = size + sizeof(struct sk_buff);
1883
1884 usbnet_skb_return(dev, ax_skb);
1885 }
1886
1887 skb_pull(skb, size);
1888
1889 /* padding bytes before the next frame starts */
1890 if (skb->len)
1891 skb_pull(skb, align_count);
1892 }
1893
1894 return 1;
1895 }
1896
smsc95xx_calc_csum_preamble(struct sk_buff * skb)1897 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1898 {
1899 u16 low_16 = (u16)skb_checksum_start_offset(skb);
1900 u16 high_16 = low_16 + skb->csum_offset;
1901 return (high_16 << 16) | low_16;
1902 }
1903
1904 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1905 * transmission. This is fairly unlikely, only seems to trigger with some
1906 * short TCP ACK packets sent.
1907 *
1908 * Note, this calculation should probably check for the alignment of the
1909 * data as well, but a straight check for csum being in the last four bytes
1910 * of the packet should be ok for now.
1911 */
smsc95xx_can_tx_checksum(struct sk_buff * skb)1912 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1913 {
1914 unsigned int len = skb->len - skb_checksum_start_offset(skb);
1915
1916 if (skb->len <= 45)
1917 return false;
1918 return skb->csum_offset < (len - (4 + 1));
1919 }
1920
smsc95xx_tx_fixup(struct usbnet * dev,struct sk_buff * skb,gfp_t flags)1921 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1922 struct sk_buff *skb, gfp_t flags)
1923 {
1924 bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1925 int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1926 u32 tx_cmd_a, tx_cmd_b;
1927 void *ptr;
1928
1929 /* We do not advertise SG, so skbs should be already linearized */
1930 BUG_ON(skb_shinfo(skb)->nr_frags);
1931
1932 /* Make writable and expand header space by overhead if required */
1933 if (skb_cow_head(skb, overhead)) {
1934 /* Must deallocate here as returning NULL to indicate error
1935 * means the skb won't be deallocated in the caller.
1936 */
1937 dev_kfree_skb_any(skb);
1938 return NULL;
1939 }
1940
1941 tx_cmd_b = (u32)skb->len;
1942 tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1943
1944 if (csum) {
1945 if (!smsc95xx_can_tx_checksum(skb)) {
1946 /* workaround - hardware tx checksum does not work
1947 * properly with extremely small packets */
1948 long csstart = skb_checksum_start_offset(skb);
1949 __wsum calc = csum_partial(skb->data + csstart,
1950 skb->len - csstart, 0);
1951 *((__sum16 *)(skb->data + csstart
1952 + skb->csum_offset)) = csum_fold(calc);
1953
1954 csum = false;
1955 } else {
1956 u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1957 ptr = skb_push(skb, 4);
1958 put_unaligned_le32(csum_preamble, ptr);
1959
1960 tx_cmd_a += 4;
1961 tx_cmd_b += 4;
1962 tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1963 }
1964 }
1965
1966 ptr = skb_push(skb, 8);
1967 put_unaligned_le32(tx_cmd_a, ptr);
1968 put_unaligned_le32(tx_cmd_b, ptr+4);
1969
1970 return skb;
1971 }
1972
smsc95xx_manage_power(struct usbnet * dev,int on)1973 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1974 {
1975 struct smsc95xx_priv *pdata = dev->driver_priv;
1976
1977 dev->intf->needs_remote_wakeup = on;
1978
1979 if (pdata->features & FEATURE_REMOTE_WAKEUP)
1980 return 0;
1981
1982 /* this chip revision isn't capable of remote wakeup */
1983 netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1984
1985 if (on)
1986 usb_autopm_get_interface_no_resume(dev->intf);
1987 else
1988 usb_autopm_put_interface(dev->intf);
1989
1990 return 0;
1991 }
1992
1993 static const struct driver_info smsc95xx_info = {
1994 .description = "smsc95xx USB 2.0 Ethernet",
1995 .bind = smsc95xx_bind,
1996 .unbind = smsc95xx_unbind,
1997 .reset = smsc95xx_reset,
1998 .check_connect = smsc95xx_start_phy,
1999 .stop = smsc95xx_stop,
2000 .rx_fixup = smsc95xx_rx_fixup,
2001 .tx_fixup = smsc95xx_tx_fixup,
2002 .status = smsc95xx_status,
2003 .manage_power = smsc95xx_manage_power,
2004 .flags = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
2005 };
2006
2007 static const struct usb_device_id products[] = {
2008 {
2009 /* SMSC9500 USB Ethernet Device */
2010 USB_DEVICE(0x0424, 0x9500),
2011 .driver_info = (unsigned long) &smsc95xx_info,
2012 },
2013 {
2014 /* SMSC9505 USB Ethernet Device */
2015 USB_DEVICE(0x0424, 0x9505),
2016 .driver_info = (unsigned long) &smsc95xx_info,
2017 },
2018 {
2019 /* SMSC9500A USB Ethernet Device */
2020 USB_DEVICE(0x0424, 0x9E00),
2021 .driver_info = (unsigned long) &smsc95xx_info,
2022 },
2023 {
2024 /* SMSC9505A USB Ethernet Device */
2025 USB_DEVICE(0x0424, 0x9E01),
2026 .driver_info = (unsigned long) &smsc95xx_info,
2027 },
2028 {
2029 /* SMSC9512/9514 USB Hub & Ethernet Device */
2030 USB_DEVICE(0x0424, 0xec00),
2031 .driver_info = (unsigned long) &smsc95xx_info,
2032 },
2033 {
2034 /* SMSC9500 USB Ethernet Device (SAL10) */
2035 USB_DEVICE(0x0424, 0x9900),
2036 .driver_info = (unsigned long) &smsc95xx_info,
2037 },
2038 {
2039 /* SMSC9505 USB Ethernet Device (SAL10) */
2040 USB_DEVICE(0x0424, 0x9901),
2041 .driver_info = (unsigned long) &smsc95xx_info,
2042 },
2043 {
2044 /* SMSC9500A USB Ethernet Device (SAL10) */
2045 USB_DEVICE(0x0424, 0x9902),
2046 .driver_info = (unsigned long) &smsc95xx_info,
2047 },
2048 {
2049 /* SMSC9505A USB Ethernet Device (SAL10) */
2050 USB_DEVICE(0x0424, 0x9903),
2051 .driver_info = (unsigned long) &smsc95xx_info,
2052 },
2053 {
2054 /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2055 USB_DEVICE(0x0424, 0x9904),
2056 .driver_info = (unsigned long) &smsc95xx_info,
2057 },
2058 {
2059 /* SMSC9500A USB Ethernet Device (HAL) */
2060 USB_DEVICE(0x0424, 0x9905),
2061 .driver_info = (unsigned long) &smsc95xx_info,
2062 },
2063 {
2064 /* SMSC9505A USB Ethernet Device (HAL) */
2065 USB_DEVICE(0x0424, 0x9906),
2066 .driver_info = (unsigned long) &smsc95xx_info,
2067 },
2068 {
2069 /* SMSC9500 USB Ethernet Device (Alternate ID) */
2070 USB_DEVICE(0x0424, 0x9907),
2071 .driver_info = (unsigned long) &smsc95xx_info,
2072 },
2073 {
2074 /* SMSC9500A USB Ethernet Device (Alternate ID) */
2075 USB_DEVICE(0x0424, 0x9908),
2076 .driver_info = (unsigned long) &smsc95xx_info,
2077 },
2078 {
2079 /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2080 USB_DEVICE(0x0424, 0x9909),
2081 .driver_info = (unsigned long) &smsc95xx_info,
2082 },
2083 {
2084 /* SMSC LAN9530 USB Ethernet Device */
2085 USB_DEVICE(0x0424, 0x9530),
2086 .driver_info = (unsigned long) &smsc95xx_info,
2087 },
2088 {
2089 /* SMSC LAN9730 USB Ethernet Device */
2090 USB_DEVICE(0x0424, 0x9730),
2091 .driver_info = (unsigned long) &smsc95xx_info,
2092 },
2093 {
2094 /* SMSC LAN89530 USB Ethernet Device */
2095 USB_DEVICE(0x0424, 0x9E08),
2096 .driver_info = (unsigned long) &smsc95xx_info,
2097 },
2098 { }, /* END */
2099 };
2100 MODULE_DEVICE_TABLE(usb, products);
2101
2102 static struct usb_driver smsc95xx_driver = {
2103 .name = "smsc95xx",
2104 .id_table = products,
2105 .probe = usbnet_probe,
2106 .suspend = smsc95xx_suspend,
2107 .resume = smsc95xx_resume,
2108 .reset_resume = smsc95xx_reset_resume,
2109 .disconnect = usbnet_disconnect,
2110 .disable_hub_initiated_lpm = 1,
2111 .supports_autosuspend = 1,
2112 };
2113
2114 module_usb_driver(smsc95xx_driver);
2115
2116 MODULE_AUTHOR("Nancy Lin");
2117 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2118 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2119 MODULE_LICENSE("GPL");
2120