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1/*
2 * USB 10M/100M ethernet adapter
3 *
4 * This file is licensed under the terms of the GNU General Public License
5 * version 2. This program is licensed "as is" without any warranty of any
6 * kind, whether express or implied
7 *
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/sched.h>
13#include <linux/stddef.h>
14#include <linux/init.h>
15#include <linux/netdevice.h>
16#include <linux/etherdevice.h>
17#include <linux/ethtool.h>
18#include <linux/mii.h>
19#include <linux/usb.h>
20#include <linux/crc32.h>
21#include <linux/usb/usbnet.h>
22#include <linux/slab.h>
23
24#define CH9200_VID 0x1A86
25#define CH9200_PID_E092 0xE092
26
27#define CTRL_TIMEOUT_MS 1000
28
29#define CONTROL_TIMEOUT_MS 1000
30
31#define REQUEST_READ 0x0E
32#define REQUEST_WRITE 0x0F
33
34/* Address space:
35 * 00-63 : MII
36 * 64-128: MAC
37 *
38 * Note: all accesses must be 16-bit
39 */
40
41#define MAC_REG_CTRL 64
42#define MAC_REG_STATUS 66
43#define MAC_REG_INTERRUPT_MASK 68
44#define MAC_REG_PHY_COMMAND 70
45#define MAC_REG_PHY_DATA 72
46#define MAC_REG_STATION_L 74
47#define MAC_REG_STATION_M 76
48#define MAC_REG_STATION_H 78
49#define MAC_REG_HASH_L 80
50#define MAC_REG_HASH_M1 82
51#define MAC_REG_HASH_M2 84
52#define MAC_REG_HASH_H 86
53#define MAC_REG_THRESHOLD 88
54#define MAC_REG_FIFO_DEPTH 90
55#define MAC_REG_PAUSE 92
56#define MAC_REG_FLOW_CONTROL 94
57
58/* Control register bits
59 *
60 * Note: bits 13 and 15 are reserved
61 */
62#define LOOPBACK (0x01 << 14)
63#define BASE100X (0x01 << 12)
64#define MBPS_10 (0x01 << 11)
65#define DUPLEX_MODE (0x01 << 10)
66#define PAUSE_FRAME (0x01 << 9)
67#define PROMISCUOUS (0x01 << 8)
68#define MULTICAST (0x01 << 7)
69#define BROADCAST (0x01 << 6)
70#define HASH (0x01 << 5)
71#define APPEND_PAD (0x01 << 4)
72#define APPEND_CRC (0x01 << 3)
73#define TRANSMITTER_ACTION (0x01 << 2)
74#define RECEIVER_ACTION (0x01 << 1)
75#define DMA_ACTION (0x01 << 0)
76
77/* Status register bits
78 *
79 * Note: bits 7-15 are reserved
80 */
81#define ALIGNMENT (0x01 << 6)
82#define FIFO_OVER_RUN (0x01 << 5)
83#define FIFO_UNDER_RUN (0x01 << 4)
84#define RX_ERROR (0x01 << 3)
85#define RX_COMPLETE (0x01 << 2)
86#define TX_ERROR (0x01 << 1)
87#define TX_COMPLETE (0x01 << 0)
88
89/* FIFO depth register bits
90 *
91 * Note: bits 6 and 14 are reserved
92 */
93
94#define ETH_TXBD (0x01 << 15)
95#define ETN_TX_FIFO_DEPTH (0x01 << 8)
96#define ETH_RXBD (0x01 << 7)
97#define ETH_RX_FIFO_DEPTH (0x01 << 0)
98
99static int control_read(struct usbnet *dev,
100 unsigned char request, unsigned short value,
101 unsigned short index, void *data, unsigned short size,
102 int timeout)
103{
104 unsigned char *buf = NULL;
105 unsigned char request_type;
106 int err = 0;
107
108 if (request == REQUEST_READ)
109 request_type = (USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER);
110 else
111 request_type = (USB_DIR_IN | USB_TYPE_VENDOR |
112 USB_RECIP_DEVICE);
113
114 netdev_dbg(dev->net, "Control_read() index=0x%02x size=%d\n",
115 index, size);
116
117 buf = kmalloc(size, GFP_KERNEL);
118 if (!buf) {
119 err = -ENOMEM;
120 goto err_out;
121 }
122
123 err = usb_control_msg(dev->udev,
124 usb_rcvctrlpipe(dev->udev, 0),
125 request, request_type, value, index, buf, size,
126 timeout);
127 if (err == size)
128 memcpy(data, buf, size);
129 else if (err >= 0)
130 err = -EINVAL;
131 kfree(buf);
132
133 return err;
134
135err_out:
136 return err;
137}
138
139static int control_write(struct usbnet *dev, unsigned char request,
140 unsigned short value, unsigned short index,
141 void *data, unsigned short size, int timeout)
142{
143 unsigned char *buf = NULL;
144 unsigned char request_type;
145 int err = 0;
146
147 if (request == REQUEST_WRITE)
148 request_type = (USB_DIR_OUT | USB_TYPE_VENDOR |
149 USB_RECIP_OTHER);
150 else
151 request_type = (USB_DIR_OUT | USB_TYPE_VENDOR |
152 USB_RECIP_DEVICE);
153
154 netdev_dbg(dev->net, "Control_write() index=0x%02x size=%d\n",
155 index, size);
156
157 if (data) {
158 buf = kmemdup(data, size, GFP_KERNEL);
159 if (!buf) {
160 err = -ENOMEM;
161 goto err_out;
162 }
163 }
164
165 err = usb_control_msg(dev->udev,
166 usb_sndctrlpipe(dev->udev, 0),
167 request, request_type, value, index, buf, size,
168 timeout);
169 if (err >= 0 && err < size)
170 err = -EINVAL;
171 kfree(buf);
172
173 return 0;
174
175err_out:
176 return err;
177}
178
179static int ch9200_mdio_read(struct net_device *netdev, int phy_id, int loc)
180{
181 struct usbnet *dev = netdev_priv(netdev);
182 unsigned char buff[2];
183
184 netdev_dbg(netdev, "ch9200_mdio_read phy_id:%02x loc:%02x\n",
185 phy_id, loc);
186
187 if (phy_id != 0)
188 return -ENODEV;
189
190 control_read(dev, REQUEST_READ, 0, loc * 2, buff, 0x02,
191 CONTROL_TIMEOUT_MS);
192
193 return (buff[0] | buff[1] << 8);
194}
195
196static void ch9200_mdio_write(struct net_device *netdev,
197 int phy_id, int loc, int val)
198{
199 struct usbnet *dev = netdev_priv(netdev);
200 unsigned char buff[2];
201
202 netdev_dbg(netdev, "ch9200_mdio_write() phy_id=%02x loc:%02x\n",
203 phy_id, loc);
204
205 if (phy_id != 0)
206 return;
207
208 buff[0] = (unsigned char)val;
209 buff[1] = (unsigned char)(val >> 8);
210
211 control_write(dev, REQUEST_WRITE, 0, loc * 2, buff, 0x02,
212 CONTROL_TIMEOUT_MS);
213}
214
215static int ch9200_link_reset(struct usbnet *dev)
216{
217 struct ethtool_cmd ecmd;
218
219 mii_check_media(&dev->mii, 1, 1);
220 mii_ethtool_gset(&dev->mii, &ecmd);
221
222 netdev_dbg(dev->net, "link_reset() speed:%d duplex:%d\n",
223 ecmd.speed, ecmd.duplex);
224
225 return 0;
226}
227
228static void ch9200_status(struct usbnet *dev, struct urb *urb)
229{
230 int link;
231 unsigned char *buf;
232
233 if (urb->actual_length < 16)
234 return;
235
236 buf = urb->transfer_buffer;
237 link = !!(buf[0] & 0x01);
238
239 if (link) {
240 netif_carrier_on(dev->net);
241 usbnet_defer_kevent(dev, EVENT_LINK_RESET);
242 } else {
243 netif_carrier_off(dev->net);
244 }
245}
246
247static struct sk_buff *ch9200_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
248 gfp_t flags)
249{
250 int i = 0;
251 int len = 0;
252 int tx_overhead = 0;
253
254 tx_overhead = 0x40;
255
256 len = skb->len;
257 if (skb_headroom(skb) < tx_overhead) {
258 struct sk_buff *skb2;
259
260 skb2 = skb_copy_expand(skb, tx_overhead, 0, flags);
261 dev_kfree_skb_any(skb);
262 skb = skb2;
263 if (!skb)
264 return NULL;
265 }
266
267 __skb_push(skb, tx_overhead);
268 /* usbnet adds padding if length is a multiple of packet size
269 * if so, adjust length value in header
270 */
271 if ((skb->len % dev->maxpacket) == 0)
272 len++;
273
274 skb->data[0] = len;
275 skb->data[1] = len >> 8;
276 skb->data[2] = 0x00;
277 skb->data[3] = 0x80;
278
279 for (i = 4; i < 48; i++)
280 skb->data[i] = 0x00;
281
282 skb->data[48] = len;
283 skb->data[49] = len >> 8;
284 skb->data[50] = 0x00;
285 skb->data[51] = 0x80;
286
287 for (i = 52; i < 64; i++)
288 skb->data[i] = 0x00;
289
290 return skb;
291}
292
293static int ch9200_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
294{
295 int len = 0;
296 int rx_overhead = 0;
297
298 rx_overhead = 64;
299
300 if (unlikely(skb->len < rx_overhead)) {
301 dev_err(&dev->udev->dev, "unexpected tiny rx frame\n");
302 return 0;
303 }
304
305 len = (skb->data[skb->len - 16] | skb->data[skb->len - 15] << 8);
306 skb_trim(skb, len);
307
308 return 1;
309}
310
311static int get_mac_address(struct usbnet *dev, unsigned char *data)
312{
313 int err = 0;
314 unsigned char mac_addr[0x06];
315 int rd_mac_len = 0;
316
317 netdev_dbg(dev->net, "get_mac_address:\n\tusbnet VID:%0x PID:%0x\n",
318 dev->udev->descriptor.idVendor,
319 dev->udev->descriptor.idProduct);
320
321 memset(mac_addr, 0, sizeof(mac_addr));
322 rd_mac_len = control_read(dev, REQUEST_READ, 0,
323 MAC_REG_STATION_L, mac_addr, 0x02,
324 CONTROL_TIMEOUT_MS);
325 rd_mac_len += control_read(dev, REQUEST_READ, 0, MAC_REG_STATION_M,
326 mac_addr + 2, 0x02, CONTROL_TIMEOUT_MS);
327 rd_mac_len += control_read(dev, REQUEST_READ, 0, MAC_REG_STATION_H,
328 mac_addr + 4, 0x02, CONTROL_TIMEOUT_MS);
329 if (rd_mac_len != ETH_ALEN)
330 err = -EINVAL;
331
332 data[0] = mac_addr[5];
333 data[1] = mac_addr[4];
334 data[2] = mac_addr[3];
335 data[3] = mac_addr[2];
336 data[4] = mac_addr[1];
337 data[5] = mac_addr[0];
338
339 return err;
340}
341
342static int ch9200_bind(struct usbnet *dev, struct usb_interface *intf)
343{
344 int retval = 0;
345 unsigned char data[2];
346
347 retval = usbnet_get_endpoints(dev, intf);
348 if (retval)
349 return retval;
350
351 dev->mii.dev = dev->net;
352 dev->mii.mdio_read = ch9200_mdio_read;
353 dev->mii.mdio_write = ch9200_mdio_write;
354 dev->mii.reg_num_mask = 0x1f;
355
356 dev->mii.phy_id_mask = 0x1f;
357
358 dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
359 dev->rx_urb_size = 24 * 64 + 16;
360 mii_nway_restart(&dev->mii);
361
362 data[0] = 0x01;
363 data[1] = 0x0F;
364 retval = control_write(dev, REQUEST_WRITE, 0, MAC_REG_THRESHOLD, data,
365 0x02, CONTROL_TIMEOUT_MS);
366
367 data[0] = 0xA0;
368 data[1] = 0x90;
369 retval = control_write(dev, REQUEST_WRITE, 0, MAC_REG_FIFO_DEPTH, data,
370 0x02, CONTROL_TIMEOUT_MS);
371
372 data[0] = 0x30;
373 data[1] = 0x00;
374 retval = control_write(dev, REQUEST_WRITE, 0, MAC_REG_PAUSE, data,
375 0x02, CONTROL_TIMEOUT_MS);
376
377 data[0] = 0x17;
378 data[1] = 0xD8;
379 retval = control_write(dev, REQUEST_WRITE, 0, MAC_REG_FLOW_CONTROL,
380 data, 0x02, CONTROL_TIMEOUT_MS);
381
382 /* Undocumented register */
383 data[0] = 0x01;
384 data[1] = 0x00;
385 retval = control_write(dev, REQUEST_WRITE, 0, 254, data, 0x02,
386 CONTROL_TIMEOUT_MS);
387
388 data[0] = 0x5F;
389 data[1] = 0x0D;
390 retval = control_write(dev, REQUEST_WRITE, 0, MAC_REG_CTRL, data, 0x02,
391 CONTROL_TIMEOUT_MS);
392
393 retval = get_mac_address(dev, dev->net->dev_addr);
394
395 return retval;
396}
397
398static const struct driver_info ch9200_info = {
399 .description = "CH9200 USB to Network Adaptor",
400 .flags = FLAG_ETHER,
401 .bind = ch9200_bind,
402 .rx_fixup = ch9200_rx_fixup,
403 .tx_fixup = ch9200_tx_fixup,
404 .status = ch9200_status,
405 .link_reset = ch9200_link_reset,
406 .reset = ch9200_link_reset,
407};
408
409static const struct usb_device_id ch9200_products[] = {
410 {
411 USB_DEVICE(0x1A86, 0xE092),
412 .driver_info = (unsigned long)&ch9200_info,
413 },
414 {},
415};
416
417MODULE_DEVICE_TABLE(usb, ch9200_products);
418
419static struct usb_driver ch9200_driver = {
420 .name = "ch9200",
421 .id_table = ch9200_products,
422 .probe = usbnet_probe,
423 .disconnect = usbnet_disconnect,
424 .suspend = usbnet_suspend,
425 .resume = usbnet_resume,
426};
427
428module_usb_driver(ch9200_driver);
429
430MODULE_DESCRIPTION("QinHeng CH9200 USB Network device");
431MODULE_LICENSE("GPL");