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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
26static 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
37static 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
48static int sr_read_reg(struct usbnet *dev, u8 reg, u8 *value)
49{
50 return sr_read(dev, reg, 1, value);
51}
52
53static 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
59static 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
65static 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
71static 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, 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
94static 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, EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
102 sr_write_reg(dev, 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, EPCR, 0x0);
109 ret = sr_read(dev, 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
114out_unlock:
115 mutex_unlock(&dev->phy_mutex);
116 return ret;
117}
118
119static 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, EPDR, 2, &value);
127 if (ret < 0)
128 goto out_unlock;
129
130 sr_write_reg(dev, EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
131 sr_write_reg(dev, 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, EPCR, 0x0);
139
140out_unlock:
141 mutex_unlock(&dev->phy_mutex);
142 return ret;
143}
144
145static 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
150static int sr9700_get_eeprom_len(struct net_device *netdev)
151{
152 return SR_EEPROM_LEN;
153}
154
155static 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
176static 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, 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
207static 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
224static 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, NSR, &value);
232 if (value & NSR_LINKST)
233 rc = 1;
234
235 return rc;
236}
237
238static 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
245static 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 .get_settings = usbnet_get_settings,
253 .set_settings = usbnet_set_settings,
254 .nway_reset = usbnet_nway_reset,
255};
256
257static 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, MAR, SR_MCAST_SIZE, hashes);
285 sr_write_reg_async(dev, RCR, rx_ctl);
286}
287
288static 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, PAR, 6, netdev->dev_addr);
301
302 return 0;
303}
304
305static 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_validate_addr = eth_validate_addr,
312 .ndo_do_ioctl = sr9700_ioctl,
313 .ndo_set_rx_mode = sr9700_set_multicast,
314 .ndo_set_mac_address = sr9700_set_mac_address,
315};
316
317static int sr9700_bind(struct usbnet *dev, struct usb_interface *intf)
318{
319 struct net_device *netdev;
320 struct mii_if_info *mii;
321 int ret;
322
323 ret = usbnet_get_endpoints(dev, intf);
324 if (ret)
325 goto out;
326
327 netdev = dev->net;
328
329 netdev->netdev_ops = &sr9700_netdev_ops;
330 netdev->ethtool_ops = &sr9700_ethtool_ops;
331 netdev->hard_header_len += SR_TX_OVERHEAD;
332 dev->hard_mtu = netdev->mtu + netdev->hard_header_len;
333 /* bulkin buffer is preferably not less than 3K */
334 dev->rx_urb_size = 3072;
335
336 mii = &dev->mii;
337 mii->dev = netdev;
338 mii->mdio_read = sr_mdio_read;
339 mii->mdio_write = sr_mdio_write;
340 mii->phy_id_mask = 0x1f;
341 mii->reg_num_mask = 0x1f;
342
343 sr_write_reg(dev, NCR, NCR_RST);
344 udelay(20);
345
346 /* read MAC
347 * After Chip Power on, the Chip will reload the MAC from
348 * EEPROM automatically to PAR. In case there is no EEPROM externally,
349 * a default MAC address is stored in PAR for making chip work properly.
350 */
351 if (sr_read(dev, PAR, ETH_ALEN, netdev->dev_addr) < 0) {
352 netdev_err(netdev, "Error reading MAC address\n");
353 ret = -ENODEV;
354 goto out;
355 }
356
357 /* power up and reset phy */
358 sr_write_reg(dev, PRR, PRR_PHY_RST);
359 /* at least 10ms, here 20ms for safe */
360 mdelay(20);
361 sr_write_reg(dev, PRR, 0);
362 /* at least 1ms, here 2ms for reading right register */
363 udelay(2 * 1000);
364
365 /* receive broadcast packets */
366 sr9700_set_multicast(netdev);
367
368 sr_mdio_write(netdev, mii->phy_id, MII_BMCR, BMCR_RESET);
369 sr_mdio_write(netdev, mii->phy_id, MII_ADVERTISE, ADVERTISE_ALL |
370 ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP);
371 mii_nway_restart(mii);
372
373out:
374 return ret;
375}
376
377static int sr9700_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
378{
379 struct sk_buff *sr_skb;
380 int len;
381
382 /* skb content (packets) format :
383 * p0 p1 p2 ...... pm
384 * / \
385 * / \
386 * / \
387 * / \
388 * p0b0 p0b1 p0b2 p0b3 ...... p0b(n-4) p0b(n-3)...p0bn
389 *
390 * p0 : packet 0
391 * p0b0 : packet 0 byte 0
392 *
393 * b0: rx status
394 * b1: packet length (incl crc) low
395 * b2: packet length (incl crc) high
396 * b3..n-4: packet data
397 * bn-3..bn: ethernet packet crc
398 */
399 if (unlikely(skb->len < SR_RX_OVERHEAD)) {
400 netdev_err(dev->net, "unexpected tiny rx frame\n");
401 return 0;
402 }
403
404 /* one skb may contains multiple packets */
405 while (skb->len > SR_RX_OVERHEAD) {
406 if (skb->data[0] != 0x40)
407 return 0;
408
409 /* ignore the CRC length */
410 len = (skb->data[1] | (skb->data[2] << 8)) - 4;
411
412 if (len > ETH_FRAME_LEN)
413 return 0;
414
415 /* the last packet of current skb */
416 if (skb->len == (len + SR_RX_OVERHEAD)) {
417 skb_pull(skb, 3);
418 skb->len = len;
419 skb_set_tail_pointer(skb, len);
420 skb->truesize = len + sizeof(struct sk_buff);
421 return 2;
422 }
423
424 /* skb_clone is used for address align */
425 sr_skb = skb_clone(skb, GFP_ATOMIC);
426 if (!sr_skb)
427 return 0;
428
429 sr_skb->len = len;
430 sr_skb->data = skb->data + 3;
431 skb_set_tail_pointer(sr_skb, len);
432 sr_skb->truesize = len + sizeof(struct sk_buff);
433 usbnet_skb_return(dev, sr_skb);
434
435 skb_pull(skb, len + SR_RX_OVERHEAD);
436 };
437
438 return 0;
439}
440
441static struct sk_buff *sr9700_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
442 gfp_t flags)
443{
444 int len;
445
446 /* SR9700 can only send out one ethernet packet at once.
447 *
448 * b0 b1 b2 b3 ...... b(n-4) b(n-3)...bn
449 *
450 * b0: rx status
451 * b1: packet length (incl crc) low
452 * b2: packet length (incl crc) high
453 * b3..n-4: packet data
454 * bn-3..bn: ethernet packet crc
455 */
456
457 len = skb->len;
458
459 if (skb_headroom(skb) < SR_TX_OVERHEAD) {
460 struct sk_buff *skb2;
461
462 skb2 = skb_copy_expand(skb, SR_TX_OVERHEAD, 0, flags);
463 dev_kfree_skb_any(skb);
464 skb = skb2;
465 if (!skb)
466 return NULL;
467 }
468
469 __skb_push(skb, SR_TX_OVERHEAD);
470
471 /* usbnet adds padding if length is a multiple of packet size
472 * if so, adjust length value in header
473 */
474 if ((skb->len % dev->maxpacket) == 0)
475 len++;
476
477 skb->data[0] = len;
478 skb->data[1] = len >> 8;
479
480 return skb;
481}
482
483static void sr9700_status(struct usbnet *dev, struct urb *urb)
484{
485 int link;
486 u8 *buf;
487
488 /* format:
489 b0: net status
490 b1: tx status 1
491 b2: tx status 2
492 b3: rx status
493 b4: rx overflow
494 b5: rx count
495 b6: tx count
496 b7: gpr
497 */
498
499 if (urb->actual_length < 8)
500 return;
501
502 buf = urb->transfer_buffer;
503
504 link = !!(buf[0] & 0x40);
505 if (netif_carrier_ok(dev->net) != link) {
506 usbnet_link_change(dev, link, 1);
507 netdev_dbg(dev->net, "Link Status is: %d\n", link);
508 }
509}
510
511static int sr9700_link_reset(struct usbnet *dev)
512{
513 struct ethtool_cmd ecmd;
514
515 mii_check_media(&dev->mii, 1, 1);
516 mii_ethtool_gset(&dev->mii, &ecmd);
517
518 netdev_dbg(dev->net, "link_reset() speed: %d duplex: %d\n",
519 ecmd.speed, ecmd.duplex);
520
521 return 0;
522}
523
524static const struct driver_info sr9700_driver_info = {
525 .description = "CoreChip SR9700 USB Ethernet",
526 .flags = FLAG_ETHER,
527 .bind = sr9700_bind,
528 .rx_fixup = sr9700_rx_fixup,
529 .tx_fixup = sr9700_tx_fixup,
530 .status = sr9700_status,
531 .link_reset = sr9700_link_reset,
532 .reset = sr9700_link_reset,
533};
534
535static const struct usb_device_id products[] = {
536 {
537 USB_DEVICE(0x0fe6, 0x9700), /* SR9700 device */
538 .driver_info = (unsigned long)&sr9700_driver_info,
539 },
540 {}, /* END */
541};
542
543MODULE_DEVICE_TABLE(usb, products);
544
545static struct usb_driver sr9700_usb_driver = {
546 .name = "sr9700",
547 .id_table = products,
548 .probe = usbnet_probe,
549 .disconnect = usbnet_disconnect,
550 .suspend = usbnet_suspend,
551 .resume = usbnet_resume,
552 .disable_hub_initiated_lpm = 1,
553};
554
555module_usb_driver(sr9700_usb_driver);
556
557MODULE_AUTHOR("liujl <liujunliang_ljl@163.com>");
558MODULE_DESCRIPTION("SR9700 one chip USB 1.1 USB to Ethernet device from http://www.corechip-sz.com/");
559MODULE_LICENSE("GPL");
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
26static 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
37static 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
48static int sr_read_reg(struct usbnet *dev, u8 reg, u8 *value)
49{
50 return sr_read(dev, reg, 1, value);
51}
52
53static 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
59static void sr_write_async(struct usbnet *dev, u8 reg, u16 length,
60 const void *data)
61{
62 usbnet_write_cmd_async(dev, SR_WR_REGS, SR_REQ_WR_REG,
63 0, reg, data, length);
64}
65
66static void sr_write_reg_async(struct usbnet *dev, u8 reg, u8 value)
67{
68 usbnet_write_cmd_async(dev, SR_WR_REGS, SR_REQ_WR_REG,
69 value, reg, NULL, 0);
70}
71
72static int wait_phy_eeprom_ready(struct usbnet *dev, int phy)
73{
74 int i;
75
76 for (i = 0; i < SR_SHARE_TIMEOUT; i++) {
77 u8 tmp = 0;
78 int ret;
79
80 udelay(1);
81 ret = sr_read_reg(dev, SR_EPCR, &tmp);
82 if (ret < 0)
83 return ret;
84
85 /* ready */
86 if (!(tmp & EPCR_ERRE))
87 return 0;
88 }
89
90 netdev_err(dev->net, "%s write timed out!\n", phy ? "phy" : "eeprom");
91
92 return -EIO;
93}
94
95static int sr_share_read_word(struct usbnet *dev, int phy, u8 reg,
96 __le16 *value)
97{
98 int ret;
99
100 mutex_lock(&dev->phy_mutex);
101
102 sr_write_reg(dev, SR_EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
103 sr_write_reg(dev, SR_EPCR, phy ? (EPCR_EPOS | EPCR_ERPRR) : EPCR_ERPRR);
104
105 ret = wait_phy_eeprom_ready(dev, phy);
106 if (ret < 0)
107 goto out_unlock;
108
109 sr_write_reg(dev, SR_EPCR, 0x0);
110 ret = sr_read(dev, SR_EPDR, 2, value);
111
112 netdev_dbg(dev->net, "read shared %d 0x%02x returned 0x%04x, %d\n",
113 phy, reg, *value, ret);
114
115out_unlock:
116 mutex_unlock(&dev->phy_mutex);
117 return ret;
118}
119
120static int sr_share_write_word(struct usbnet *dev, int phy, u8 reg,
121 __le16 value)
122{
123 int ret;
124
125 mutex_lock(&dev->phy_mutex);
126
127 ret = sr_write(dev, SR_EPDR, 2, &value);
128 if (ret < 0)
129 goto out_unlock;
130
131 sr_write_reg(dev, SR_EPAR, phy ? (reg | EPAR_PHY_ADR) : reg);
132 sr_write_reg(dev, SR_EPCR, phy ? (EPCR_WEP | EPCR_EPOS | EPCR_ERPRW) :
133 (EPCR_WEP | EPCR_ERPRW));
134
135 ret = wait_phy_eeprom_ready(dev, phy);
136 if (ret < 0)
137 goto out_unlock;
138
139 sr_write_reg(dev, SR_EPCR, 0x0);
140
141out_unlock:
142 mutex_unlock(&dev->phy_mutex);
143 return ret;
144}
145
146static int sr_read_eeprom_word(struct usbnet *dev, u8 offset, void *value)
147{
148 return sr_share_read_word(dev, 0, offset, value);
149}
150
151static int sr9700_get_eeprom_len(struct net_device *netdev)
152{
153 return SR_EEPROM_LEN;
154}
155
156static int sr9700_get_eeprom(struct net_device *netdev,
157 struct ethtool_eeprom *eeprom, u8 *data)
158{
159 struct usbnet *dev = netdev_priv(netdev);
160 __le16 *buf = (__le16 *)data;
161 int ret = 0;
162 int i;
163
164 /* access is 16bit */
165 if ((eeprom->offset & 0x01) || (eeprom->len & 0x01))
166 return -EINVAL;
167
168 for (i = 0; i < eeprom->len / 2; i++) {
169 ret = sr_read_eeprom_word(dev, eeprom->offset / 2 + i, buf + i);
170 if (ret < 0)
171 break;
172 }
173
174 return ret;
175}
176
177static int sr_mdio_read(struct net_device *netdev, int phy_id, int loc)
178{
179 struct usbnet *dev = netdev_priv(netdev);
180 __le16 res;
181 int rc = 0;
182
183 if (phy_id) {
184 netdev_dbg(netdev, "Only internal phy supported\n");
185 return 0;
186 }
187
188 /* Access NSR_LINKST bit for link status instead of MII_BMSR */
189 if (loc == MII_BMSR) {
190 u8 value;
191
192 sr_read_reg(dev, SR_NSR, &value);
193 if (value & NSR_LINKST)
194 rc = 1;
195 }
196 sr_share_read_word(dev, 1, loc, &res);
197 if (rc == 1)
198 res = le16_to_cpu(res) | BMSR_LSTATUS;
199 else
200 res = le16_to_cpu(res) & ~BMSR_LSTATUS;
201
202 netdev_dbg(netdev, "sr_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
203 phy_id, loc, res);
204
205 return res;
206}
207
208static void sr_mdio_write(struct net_device *netdev, int phy_id, int loc,
209 int val)
210{
211 struct usbnet *dev = netdev_priv(netdev);
212 __le16 res = cpu_to_le16(val);
213
214 if (phy_id) {
215 netdev_dbg(netdev, "Only internal phy supported\n");
216 return;
217 }
218
219 netdev_dbg(netdev, "sr_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
220 phy_id, loc, val);
221
222 sr_share_write_word(dev, 1, loc, res);
223}
224
225static u32 sr9700_get_link(struct net_device *netdev)
226{
227 struct usbnet *dev = netdev_priv(netdev);
228 u8 value = 0;
229 int rc = 0;
230
231 /* Get the Link Status directly */
232 sr_read_reg(dev, SR_NSR, &value);
233 if (value & NSR_LINKST)
234 rc = 1;
235
236 return rc;
237}
238
239static int sr9700_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
240{
241 struct usbnet *dev = netdev_priv(netdev);
242
243 return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
244}
245
246static const struct ethtool_ops sr9700_ethtool_ops = {
247 .get_drvinfo = usbnet_get_drvinfo,
248 .get_link = sr9700_get_link,
249 .get_msglevel = usbnet_get_msglevel,
250 .set_msglevel = usbnet_set_msglevel,
251 .get_eeprom_len = sr9700_get_eeprom_len,
252 .get_eeprom = sr9700_get_eeprom,
253 .nway_reset = usbnet_nway_reset,
254 .get_link_ksettings = usbnet_get_link_ksettings_mii,
255 .set_link_ksettings = usbnet_set_link_ksettings_mii,
256};
257
258static void sr9700_set_multicast(struct net_device *netdev)
259{
260 struct usbnet *dev = netdev_priv(netdev);
261 /* We use the 20 byte dev->data for our 8 byte filter buffer
262 * to avoid allocating memory that is tricky to free later
263 */
264 u8 *hashes = (u8 *)&dev->data;
265 /* rx_ctl setting : enable, disable_long, disable_crc */
266 u8 rx_ctl = RCR_RXEN | RCR_DIS_CRC | RCR_DIS_LONG;
267
268 memset(hashes, 0x00, SR_MCAST_SIZE);
269 /* broadcast address */
270 hashes[SR_MCAST_SIZE - 1] |= SR_MCAST_ADDR_FLAG;
271 if (netdev->flags & IFF_PROMISC) {
272 rx_ctl |= RCR_PRMSC;
273 } else if (netdev->flags & IFF_ALLMULTI ||
274 netdev_mc_count(netdev) > SR_MCAST_MAX) {
275 rx_ctl |= RCR_RUNT;
276 } else if (!netdev_mc_empty(netdev)) {
277 struct netdev_hw_addr *ha;
278
279 netdev_for_each_mc_addr(ha, netdev) {
280 u32 crc = ether_crc(ETH_ALEN, ha->addr) >> 26;
281 hashes[crc >> 3] |= 1 << (crc & 0x7);
282 }
283 }
284
285 sr_write_async(dev, SR_MAR, SR_MCAST_SIZE, hashes);
286 sr_write_reg_async(dev, SR_RCR, rx_ctl);
287}
288
289static int sr9700_set_mac_address(struct net_device *netdev, void *p)
290{
291 struct usbnet *dev = netdev_priv(netdev);
292 struct sockaddr *addr = p;
293
294 if (!is_valid_ether_addr(addr->sa_data)) {
295 netdev_err(netdev, "not setting invalid mac address %pM\n",
296 addr->sa_data);
297 return -EINVAL;
298 }
299
300 eth_hw_addr_set(netdev, addr->sa_data);
301 sr_write_async(dev, SR_PAR, 6, netdev->dev_addr);
302
303 return 0;
304}
305
306static const struct net_device_ops sr9700_netdev_ops = {
307 .ndo_open = usbnet_open,
308 .ndo_stop = usbnet_stop,
309 .ndo_start_xmit = usbnet_start_xmit,
310 .ndo_tx_timeout = usbnet_tx_timeout,
311 .ndo_change_mtu = usbnet_change_mtu,
312 .ndo_get_stats64 = dev_get_tstats64,
313 .ndo_validate_addr = eth_validate_addr,
314 .ndo_eth_ioctl = sr9700_ioctl,
315 .ndo_set_rx_mode = sr9700_set_multicast,
316 .ndo_set_mac_address = sr9700_set_mac_address,
317};
318
319static int sr9700_bind(struct usbnet *dev, struct usb_interface *intf)
320{
321 struct net_device *netdev;
322 struct mii_if_info *mii;
323 u8 addr[ETH_ALEN];
324 int ret;
325
326 ret = usbnet_get_endpoints(dev, intf);
327 if (ret)
328 goto out;
329
330 netdev = dev->net;
331
332 netdev->netdev_ops = &sr9700_netdev_ops;
333 netdev->ethtool_ops = &sr9700_ethtool_ops;
334 netdev->hard_header_len += SR_TX_OVERHEAD;
335 dev->hard_mtu = netdev->mtu + netdev->hard_header_len;
336 /* bulkin buffer is preferably not less than 3K */
337 dev->rx_urb_size = 3072;
338
339 mii = &dev->mii;
340 mii->dev = netdev;
341 mii->mdio_read = sr_mdio_read;
342 mii->mdio_write = sr_mdio_write;
343 mii->phy_id_mask = 0x1f;
344 mii->reg_num_mask = 0x1f;
345
346 sr_write_reg(dev, SR_NCR, NCR_RST);
347 udelay(20);
348
349 /* read MAC
350 * After Chip Power on, the Chip will reload the MAC from
351 * EEPROM automatically to PAR. In case there is no EEPROM externally,
352 * a default MAC address is stored in PAR for making chip work properly.
353 */
354 if (sr_read(dev, SR_PAR, ETH_ALEN, addr) < 0) {
355 netdev_err(netdev, "Error reading MAC address\n");
356 ret = -ENODEV;
357 goto out;
358 }
359 eth_hw_addr_set(netdev, addr);
360
361 /* power up and reset phy */
362 sr_write_reg(dev, SR_PRR, PRR_PHY_RST);
363 /* at least 10ms, here 20ms for safe */
364 msleep(20);
365 sr_write_reg(dev, SR_PRR, 0);
366 /* at least 1ms, here 2ms for reading right register */
367 udelay(2 * 1000);
368
369 /* receive broadcast packets */
370 sr9700_set_multicast(netdev);
371
372 sr_mdio_write(netdev, mii->phy_id, MII_BMCR, BMCR_RESET);
373 sr_mdio_write(netdev, mii->phy_id, MII_ADVERTISE, ADVERTISE_ALL |
374 ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP);
375 mii_nway_restart(mii);
376
377out:
378 return ret;
379}
380
381static int sr9700_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
382{
383 struct sk_buff *sr_skb;
384 int len;
385
386 /* skb content (packets) format :
387 * p0 p1 p2 ...... pm
388 * / \
389 * / \
390 * / \
391 * / \
392 * p0b0 p0b1 p0b2 p0b3 ...... p0b(n-4) p0b(n-3)...p0bn
393 *
394 * p0 : packet 0
395 * p0b0 : packet 0 byte 0
396 *
397 * b0: rx status
398 * b1: packet length (incl crc) low
399 * b2: packet length (incl crc) high
400 * b3..n-4: packet data
401 * bn-3..bn: ethernet packet crc
402 */
403 if (unlikely(skb->len < SR_RX_OVERHEAD)) {
404 netdev_err(dev->net, "unexpected tiny rx frame\n");
405 return 0;
406 }
407
408 /* one skb may contains multiple packets */
409 while (skb->len > SR_RX_OVERHEAD) {
410 if (skb->data[0] != 0x40)
411 return 0;
412
413 /* ignore the CRC length */
414 len = (skb->data[1] | (skb->data[2] << 8)) - 4;
415
416 if (len > ETH_FRAME_LEN || len > skb->len || len < 0)
417 return 0;
418
419 /* the last packet of current skb */
420 if (skb->len == (len + SR_RX_OVERHEAD)) {
421 skb_pull(skb, 3);
422 skb->len = len;
423 skb_set_tail_pointer(skb, len);
424 skb->truesize = len + sizeof(struct sk_buff);
425 return 2;
426 }
427
428 /* skb_clone is used for address align */
429 sr_skb = skb_clone(skb, GFP_ATOMIC);
430 if (!sr_skb)
431 return 0;
432
433 sr_skb->len = len;
434 sr_skb->data = skb->data + 3;
435 skb_set_tail_pointer(sr_skb, len);
436 sr_skb->truesize = len + sizeof(struct sk_buff);
437 usbnet_skb_return(dev, sr_skb);
438
439 skb_pull(skb, len + SR_RX_OVERHEAD);
440 }
441
442 return 0;
443}
444
445static struct sk_buff *sr9700_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
446 gfp_t flags)
447{
448 int len;
449
450 /* SR9700 can only send out one ethernet packet at once.
451 *
452 * b0 b1 b2 b3 ...... b(n-4) b(n-3)...bn
453 *
454 * b0: rx status
455 * b1: packet length (incl crc) low
456 * b2: packet length (incl crc) high
457 * b3..n-4: packet data
458 * bn-3..bn: ethernet packet crc
459 */
460
461 len = skb->len;
462
463 if (skb_cow_head(skb, SR_TX_OVERHEAD)) {
464 dev_kfree_skb_any(skb);
465 return NULL;
466 }
467
468 __skb_push(skb, SR_TX_OVERHEAD);
469
470 /* usbnet adds padding if length is a multiple of packet size
471 * if so, adjust length value in header
472 */
473 if ((skb->len % dev->maxpacket) == 0)
474 len++;
475
476 skb->data[0] = len;
477 skb->data[1] = len >> 8;
478
479 return skb;
480}
481
482static void sr9700_status(struct usbnet *dev, struct urb *urb)
483{
484 int link;
485 u8 *buf;
486
487 /* format:
488 b0: net status
489 b1: tx status 1
490 b2: tx status 2
491 b3: rx status
492 b4: rx overflow
493 b5: rx count
494 b6: tx count
495 b7: gpr
496 */
497
498 if (urb->actual_length < 8)
499 return;
500
501 buf = urb->transfer_buffer;
502
503 link = !!(buf[0] & 0x40);
504 if (netif_carrier_ok(dev->net) != link) {
505 usbnet_link_change(dev, link, 1);
506 netdev_dbg(dev->net, "Link Status is: %d\n", link);
507 }
508}
509
510static int sr9700_link_reset(struct usbnet *dev)
511{
512 struct ethtool_cmd ecmd;
513
514 mii_check_media(&dev->mii, 1, 1);
515 mii_ethtool_gset(&dev->mii, &ecmd);
516
517 netdev_dbg(dev->net, "link_reset() speed: %d duplex: %d\n",
518 ecmd.speed, ecmd.duplex);
519
520 return 0;
521}
522
523static const struct driver_info sr9700_driver_info = {
524 .description = "CoreChip SR9700 USB Ethernet",
525 .flags = FLAG_ETHER,
526 .bind = sr9700_bind,
527 .rx_fixup = sr9700_rx_fixup,
528 .tx_fixup = sr9700_tx_fixup,
529 .status = sr9700_status,
530 .link_reset = sr9700_link_reset,
531 .reset = sr9700_link_reset,
532};
533
534static const struct usb_device_id products[] = {
535 {
536 USB_DEVICE(0x0fe6, 0x9700), /* SR9700 device */
537 .driver_info = (unsigned long)&sr9700_driver_info,
538 },
539 {}, /* END */
540};
541
542MODULE_DEVICE_TABLE(usb, products);
543
544static struct usb_driver sr9700_usb_driver = {
545 .name = "sr9700",
546 .id_table = products,
547 .probe = usbnet_probe,
548 .disconnect = usbnet_disconnect,
549 .suspend = usbnet_suspend,
550 .resume = usbnet_resume,
551 .disable_hub_initiated_lpm = 1,
552};
553
554module_usb_driver(sr9700_usb_driver);
555
556MODULE_AUTHOR("liujl <liujunliang_ljl@163.com>");
557MODULE_DESCRIPTION("SR9700 one chip USB 1.1 USB to Ethernet device from http://www.corechip-sz.com/");
558MODULE_LICENSE("GPL");