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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / net / usb / sr9700.c
blobe04c8054c2cf3c7c3f5c3a065b48e99d299b5501
1 /*
2 * CoreChip-sz SR9700 one chip USB 1.1 Ethernet Devices
3 *
4 * Author : Liu Junliang <liujunliang_ljl@163.com>
5 *
6 * Based on dm9601.c
7 *
8 * This file is licensed under the terms of the GNU General Public License
9 * version 2. This program is licensed "as is" without any warranty of any
10 * kind, whether express or implied.
11 */
12
13 #include <linux/module.h>
14 #include <linux/sched.h>
15 #include <linux/stddef.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/ethtool.h>
19 #include <linux/mii.h>
20 #include <linux/usb.h>
21 #include <linux/crc32.h>
22 #include <linux/usb/usbnet.h>
23
24 #include "sr9700.h"
25
26 static int sr_read(struct usbnet *dev, u8 reg, u16 length, void *data)
27 {
28 int err;
29
30 err = usbnet_read_cmd(dev, SR_RD_REGS, SR_REQ_RD_REG, 0, reg, data,
31 length);
32 if ((err != length) && (err >= 0))
33 err = -EINVAL;
34 return err;
35 }
36
37 static int sr_write(struct usbnet *dev, u8 reg, u16 length, void *data)
38 {
39 int err;
40
41 err = usbnet_write_cmd(dev, SR_WR_REGS, SR_REQ_WR_REG, 0, reg, data,
42 length);
43 if ((err >= 0) && (err < length))
44 err = -EINVAL;
45 return err;
46 }
47
48 static int sr_read_reg(struct usbnet *dev, u8 reg, u8 *value)
49 {
50 return sr_read(dev, reg, 1, value);
51 }
52
53 static int sr_write_reg(struct usbnet *dev, u8 reg, u8 value)
54 {
55 return usbnet_write_cmd(dev, SR_WR_REGS, SR_REQ_WR_REG,
56 value, reg, NULL, 0);
57 }
58
59 static void sr_write_async(struct usbnet *dev, u8 reg, u16 length, void *data)
60 {
61 usbnet_write_cmd_async(dev, SR_WR_REGS, SR_REQ_WR_REG,
62 0, reg, data, length);
63 }
64
65 static void sr_write_reg_async(struct usbnet *dev, u8 reg, u8 value)
66 {
67 usbnet_write_cmd_async(dev, SR_WR_REGS, SR_REQ_WR_REG,
68 value, reg, NULL, 0);
69 }
70
71 static int wait_phy_eeprom_ready(struct usbnet *dev, int phy)
72 {
73 int i;
74
75 for (i = 0; i < SR_SHARE_TIMEOUT; i++) {
76 u8 tmp = 0;
77 int ret;
78
79 udelay(1);
80 ret = sr_read_reg(dev, SR_EPCR, &tmp);
81 if (ret < 0)
82 return ret;
83
84 /* ready */
85 if (!(tmp & EPCR_ERRE))
86 return 0;
87 }
88
89 netdev_err(dev->net, "%s write timed out!\n", phy ? "phy" : "eeprom");
90
91 return -EIO;
92 }
93
94 static int sr_share_read_word(struct usbnet *dev, int phy, u8 reg,
95 __le16 *value)
96 {
97 int ret;
98
99 mutex_lock(&dev->phy_mutex);
100
101 sr_write_reg(dev, SR_EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
102 sr_write_reg(dev, SR_EPCR, phy ? (EPCR_EPOS | EPCR_ERPRR) : EPCR_ERPRR);
103
104 ret = wait_phy_eeprom_ready(dev, phy);
105 if (ret < 0)
106 goto out_unlock;
107
108 sr_write_reg(dev, SR_EPCR, 0x0);
109 ret = sr_read(dev, SR_EPDR, 2, value);
110
111 netdev_dbg(dev->net, "read shared %d 0x%02x returned 0x%04x, %d\n",
112 phy, reg, *value, ret);
113
114 out_unlock:
115 mutex_unlock(&dev->phy_mutex);
116 return ret;
117 }
118
119 static int sr_share_write_word(struct usbnet *dev, int phy, u8 reg,
120 __le16 value)
121 {
122 int ret;
123
124 mutex_lock(&dev->phy_mutex);
125
126 ret = sr_write(dev, SR_EPDR, 2, &value);
127 if (ret < 0)
128 goto out_unlock;
129
130 sr_write_reg(dev, SR_EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
131 sr_write_reg(dev, SR_EPCR, phy ? (EPCR_WEP | EPCR_EPOS | EPCR_ERPRW) :
132 (EPCR_WEP | EPCR_ERPRW));
133
134 ret = wait_phy_eeprom_ready(dev, phy);
135 if (ret < 0)
136 goto out_unlock;
137
138 sr_write_reg(dev, SR_EPCR, 0x0);
139
140 out_unlock:
141 mutex_unlock(&dev->phy_mutex);
142 return ret;
143 }
144
145 static int sr_read_eeprom_word(struct usbnet *dev, u8 offset, void *value)
146 {
147 return sr_share_read_word(dev, 0, offset, value);
148 }
149
150 static int sr9700_get_eeprom_len(struct net_device *netdev)
151 {
152 return SR_EEPROM_LEN;
153 }
154
155 static int sr9700_get_eeprom(struct net_device *netdev,
156 struct ethtool_eeprom *eeprom, u8 *data)
157 {
158 struct usbnet *dev = netdev_priv(netdev);
159 __le16 *buf = (__le16 *)data;
160 int ret = 0;
161 int i;
162
163 /* access is 16bit */
164 if ((eeprom->offset & 0x01) || (eeprom->len & 0x01))
165 return -EINVAL;
166
167 for (i = 0; i < eeprom->len / 2; i++) {
168 ret = sr_read_eeprom_word(dev, eeprom->offset / 2 + i, buf + i);
169 if (ret < 0)
170 break;
171 }
172
173 return ret;
174 }
175
176 static int sr_mdio_read(struct net_device *netdev, int phy_id, int loc)
177 {
178 struct usbnet *dev = netdev_priv(netdev);
179 __le16 res;
180 int rc = 0;
181
182 if (phy_id) {
183 netdev_dbg(netdev, "Only internal phy supported\n");
184 return 0;
185 }
186
187 /* Access NSR_LINKST bit for link status instead of MII_BMSR */
188 if (loc == MII_BMSR) {
189 u8 value;
190
191 sr_read_reg(dev, SR_NSR, &value);
192 if (value & NSR_LINKST)
193 rc = 1;
194 }
195 sr_share_read_word(dev, 1, loc, &res);
196 if (rc == 1)
197 res = le16_to_cpu(res) | BMSR_LSTATUS;
198 else
199 res = le16_to_cpu(res) & ~BMSR_LSTATUS;
200
201 netdev_dbg(netdev, "sr_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
202 phy_id, loc, res);
203
204 return res;
205 }
206
207 static void sr_mdio_write(struct net_device *netdev, int phy_id, int loc,
208 int val)
209 {
210 struct usbnet *dev = netdev_priv(netdev);
211 __le16 res = cpu_to_le16(val);
212
213 if (phy_id) {
214 netdev_dbg(netdev, "Only internal phy supported\n");
215 return;
216 }
217
218 netdev_dbg(netdev, "sr_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
219 phy_id, loc, val);
220
221 sr_share_write_word(dev, 1, loc, res);
222 }
223
224 static u32 sr9700_get_link(struct net_device *netdev)
225 {
226 struct usbnet *dev = netdev_priv(netdev);
227 u8 value = 0;
228 int rc = 0;
229
230 /* Get the Link Status directly */
231 sr_read_reg(dev, SR_NSR, &value);
232 if (value & NSR_LINKST)
233 rc = 1;
234
235 return rc;
236 }
237
238 static int sr9700_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
239 {
240 struct usbnet *dev = netdev_priv(netdev);
241
242 return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
243 }
244
245 static const struct ethtool_ops sr9700_ethtool_ops = {
246 .get_drvinfo = usbnet_get_drvinfo,
247 .get_link = sr9700_get_link,
248 .get_msglevel = usbnet_get_msglevel,
249 .set_msglevel = usbnet_set_msglevel,
250 .get_eeprom_len = sr9700_get_eeprom_len,
251 .get_eeprom = sr9700_get_eeprom,
252 .nway_reset = usbnet_nway_reset,
253 .get_link_ksettings = usbnet_get_link_ksettings,
254 .set_link_ksettings = usbnet_set_link_ksettings,
255 };
256
257 static void sr9700_set_multicast(struct net_device *netdev)
258 {
259 struct usbnet *dev = netdev_priv(netdev);
260 /* We use the 20 byte dev->data for our 8 byte filter buffer
261 * to avoid allocating memory that is tricky to free later
262 */
263 u8 *hashes = (u8 *)&dev->data;
264 /* rx_ctl setting : enable, disable_long, disable_crc */
265 u8 rx_ctl = RCR_RXEN | RCR_DIS_CRC | RCR_DIS_LONG;
266
267 memset(hashes, 0x00, SR_MCAST_SIZE);
268 /* broadcast address */
269 hashes[SR_MCAST_SIZE - 1] |= SR_MCAST_ADDR_FLAG;
270 if (netdev->flags & IFF_PROMISC) {
271 rx_ctl |= RCR_PRMSC;
272 } else if (netdev->flags & IFF_ALLMULTI ||
273 netdev_mc_count(netdev) > SR_MCAST_MAX) {
274 rx_ctl |= RCR_RUNT;
275 } else if (!netdev_mc_empty(netdev)) {
276 struct netdev_hw_addr *ha;
277
278 netdev_for_each_mc_addr(ha, netdev) {
279 u32 crc = ether_crc(ETH_ALEN, ha->addr) >> 26;
280 hashes[crc >> 3] |= 1 << (crc & 0x7);
281 }
282 }
283
284 sr_write_async(dev, SR_MAR, SR_MCAST_SIZE, hashes);
285 sr_write_reg_async(dev, SR_RCR, rx_ctl);
286 }
287
288 static int sr9700_set_mac_address(struct net_device *netdev, void *p)
289 {
290 struct usbnet *dev = netdev_priv(netdev);
291 struct sockaddr *addr = p;
292
293 if (!is_valid_ether_addr(addr->sa_data)) {
294 netdev_err(netdev, "not setting invalid mac address %pM\n",
295 addr->sa_data);
296 return -EINVAL;
297 }
298
299 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
300 sr_write_async(dev, SR_PAR, 6, netdev->dev_addr);
301
302 return 0;
303 }
304
305 static const struct net_device_ops sr9700_netdev_ops = {
306 .ndo_open = usbnet_open,
307 .ndo_stop = usbnet_stop,
308 .ndo_start_xmit = usbnet_start_xmit,
309 .ndo_tx_timeout = usbnet_tx_timeout,
310 .ndo_change_mtu = usbnet_change_mtu,
311 .ndo_get_stats64 = usbnet_get_stats64,
312 .ndo_validate_addr = eth_validate_addr,
313 .ndo_do_ioctl = sr9700_ioctl,
314 .ndo_set_rx_mode = sr9700_set_multicast,
315 .ndo_set_mac_address = sr9700_set_mac_address,
316 };
317
318 static int sr9700_bind(struct usbnet *dev, struct usb_interface *intf)
319 {
320 struct net_device *netdev;
321 struct mii_if_info *mii;
322 int ret;
323
324 ret = usbnet_get_endpoints(dev, intf);
325 if (ret)
326 goto out;
327
328 netdev = dev->net;
329
330 netdev->netdev_ops = &sr9700_netdev_ops;
331 netdev->ethtool_ops = &sr9700_ethtool_ops;
332 netdev->hard_header_len += SR_TX_OVERHEAD;
333 dev->hard_mtu = netdev->mtu + netdev->hard_header_len;
334 /* bulkin buffer is preferably not less than 3K */
335 dev->rx_urb_size = 3072;
336
337 mii = &dev->mii;
338 mii->dev = netdev;
339 mii->mdio_read = sr_mdio_read;
340 mii->mdio_write = sr_mdio_write;
341 mii->phy_id_mask = 0x1f;
342 mii->reg_num_mask = 0x1f;
343
344 sr_write_reg(dev, SR_NCR, NCR_RST);
345 udelay(20);
346
347 /* read MAC
348 * After Chip Power on, the Chip will reload the MAC from
349 * EEPROM automatically to PAR. In case there is no EEPROM externally,
350 * a default MAC address is stored in PAR for making chip work properly.
351 */
352 if (sr_read(dev, SR_PAR, ETH_ALEN, netdev->dev_addr) < 0) {
353 netdev_err(netdev, "Error reading MAC address\n");
354 ret = -ENODEV;
355 goto out;
356 }
357
358 /* power up and reset phy */
359 sr_write_reg(dev, SR_PRR, PRR_PHY_RST);
360 /* at least 10ms, here 20ms for safe */
361 msleep(20);
362 sr_write_reg(dev, SR_PRR, 0);
363 /* at least 1ms, here 2ms for reading right register */
364 udelay(2 * 1000);
365
366 /* receive broadcast packets */
367 sr9700_set_multicast(netdev);
368
369 sr_mdio_write(netdev, mii->phy_id, MII_BMCR, BMCR_RESET);
370 sr_mdio_write(netdev, mii->phy_id, MII_ADVERTISE, ADVERTISE_ALL |
371 ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP);
372 mii_nway_restart(mii);
373
374 out:
375 return ret;
376 }
377
378 static int sr9700_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
379 {
380 struct sk_buff *sr_skb;
381 int len;
382
383 /* skb content (packets) format :
384 * p0 p1 p2 ...... pm
385 * / \
386 * / \
387 * / \
388 * / \
389 * p0b0 p0b1 p0b2 p0b3 ...... p0b(n-4) p0b(n-3)...p0bn
390 *
391 * p0 : packet 0
392 * p0b0 : packet 0 byte 0
393 *
394 * b0: rx status
395 * b1: packet length (incl crc) low
396 * b2: packet length (incl crc) high
397 * b3..n-4: packet data
398 * bn-3..bn: ethernet packet crc
399 */
400 if (unlikely(skb->len < SR_RX_OVERHEAD)) {
401 netdev_err(dev->net, "unexpected tiny rx frame\n");
402 return 0;
403 }
404
405 /* one skb may contains multiple packets */
406 while (skb->len > SR_RX_OVERHEAD) {
407 if (skb->data[0] != 0x40)
408 return 0;
409
410 /* ignore the CRC length */
411 len = (skb->data[1] | (skb->data[2] << 8)) - 4;
412
413 if (len > ETH_FRAME_LEN)
414 return 0;
415
416 /* the last packet of current skb */
417 if (skb->len == (len + SR_RX_OVERHEAD)) {
418 skb_pull(skb, 3);
419 skb->len = len;
420 skb_set_tail_pointer(skb, len);
421 skb->truesize = len + sizeof(struct sk_buff);
422 return 2;
423 }
424
425 /* skb_clone is used for address align */
426 sr_skb = skb_clone(skb, GFP_ATOMIC);
427 if (!sr_skb)
428 return 0;
429
430 sr_skb->len = len;
431 sr_skb->data = skb->data + 3;
432 skb_set_tail_pointer(sr_skb, len);
433 sr_skb->truesize = len + sizeof(struct sk_buff);
434 usbnet_skb_return(dev, sr_skb);
435
436 skb_pull(skb, len + SR_RX_OVERHEAD);
437 }
438
439 return 0;
440 }
441
442 static struct sk_buff *sr9700_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
443 gfp_t flags)
444 {
445 int len;
446
447 /* SR9700 can only send out one ethernet packet at once.
448 *
449 * b0 b1 b2 b3 ...... b(n-4) b(n-3)...bn
450 *
451 * b0: rx status
452 * b1: packet length (incl crc) low
453 * b2: packet length (incl crc) high
454 * b3..n-4: packet data
455 * bn-3..bn: ethernet packet crc
456 */
457
458 len = skb->len;
459
460 if (skb_cow_head(skb, SR_TX_OVERHEAD)) {
461 dev_kfree_skb_any(skb);
462 return NULL;
463 }
464
465 __skb_push(skb, SR_TX_OVERHEAD);
466
467 /* usbnet adds padding if length is a multiple of packet size
468 * if so, adjust length value in header
469 */
470 if ((skb->len % dev->maxpacket) == 0)
471 len++;
472
473 skb->data[0] = len;
474 skb->data[1] = len >> 8;
475
476 return skb;
477 }
478
479 static void sr9700_status(struct usbnet *dev, struct urb *urb)
480 {
481 int link;
482 u8 *buf;
483
484 /* format:
485 b0: net status
486 b1: tx status 1
487 b2: tx status 2
488 b3: rx status
489 b4: rx overflow
490 b5: rx count
491 b6: tx count
492 b7: gpr
493 */
494
495 if (urb->actual_length < 8)
496 return;
497
498 buf = urb->transfer_buffer;
499
500 link = !!(buf[0] & 0x40);
501 if (netif_carrier_ok(dev->net) != link) {
502 usbnet_link_change(dev, link, 1);
503 netdev_dbg(dev->net, "Link Status is: %d\n", link);
504 }
505 }
506
507 static int sr9700_link_reset(struct usbnet *dev)
508 {
509 struct ethtool_cmd ecmd;
510
511 mii_check_media(&dev->mii, 1, 1);
512 mii_ethtool_gset(&dev->mii, &ecmd);
513
514 netdev_dbg(dev->net, "link_reset() speed: %d duplex: %d\n",
515 ecmd.speed, ecmd.duplex);
516
517 return 0;
518 }
519
520 static const struct driver_info sr9700_driver_info = {
521 .description = "CoreChip SR9700 USB Ethernet",
522 .flags = FLAG_ETHER,
523 .bind = sr9700_bind,
524 .rx_fixup = sr9700_rx_fixup,
525 .tx_fixup = sr9700_tx_fixup,
526 .status = sr9700_status,
527 .link_reset = sr9700_link_reset,
528 .reset = sr9700_link_reset,
529 };
530
531 static const struct usb_device_id products[] = {
532 {
533 USB_DEVICE(0x0fe6, 0x9700), /* SR9700 device */
534 .driver_info = (unsigned long)&sr9700_driver_info,
535 },
536 {}, /* END */
537 };
538
539 MODULE_DEVICE_TABLE(usb, products);
540
541 static struct usb_driver sr9700_usb_driver = {
542 .name = "sr9700",
543 .id_table = products,
544 .probe = usbnet_probe,
545 .disconnect = usbnet_disconnect,
546 .suspend = usbnet_suspend,
547 .resume = usbnet_resume,
548 .disable_hub_initiated_lpm = 1,
549 };
550
551 module_usb_driver(sr9700_usb_driver);
552
553 MODULE_AUTHOR("liujl <liujunliang_ljl@163.com>");
554 MODULE_DESCRIPTION("SR9700 one chip USB 1.1 USB to Ethernet device from http://www.corechip-sz.com/");
555 MODULE_LICENSE("GPL");
Linux with added FPC-III support