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 99 static 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, "%s() index=0x%02x size=%d\n", 115 __func__, 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 err_out: 134 return err; 135 } 136 137 static int control_write(struct usbnet *dev, unsigned char request, 138 unsigned short value, unsigned short index, 139 void *data, unsigned short size, int timeout) 140 { 141 unsigned char *buf = NULL; 142 unsigned char request_type; 143 int err = 0; 144 145 if (request == REQUEST_WRITE) 146 request_type = (USB_DIR_OUT | USB_TYPE_VENDOR | 147 USB_RECIP_OTHER); 148 else 149 request_type = (USB_DIR_OUT | USB_TYPE_VENDOR | 150 USB_RECIP_DEVICE); 151 152 netdev_dbg(dev->net, "%s() index=0x%02x size=%d\n", 153 __func__, index, size); 154 155 if (data) { 156 buf = kmemdup(data, size, GFP_KERNEL); 157 if (!buf) { 158 err = -ENOMEM; 159 goto err_out; 160 } 161 } 162 163 err = usb_control_msg(dev->udev, 164 usb_sndctrlpipe(dev->udev, 0), 165 request, request_type, value, index, buf, size, 166 timeout); 167 if (err >= 0 && err < size) 168 err = -EINVAL; 169 kfree(buf); 170 171 return 0; 172 173 err_out: 174 return err; 175 } 176 177 static int ch9200_mdio_read(struct net_device *netdev, int phy_id, int loc) 178 { 179 struct usbnet *dev = netdev_priv(netdev); 180 unsigned char buff[2]; 181 182 netdev_dbg(netdev, "%s phy_id:%02x loc:%02x\n", 183 __func__, phy_id, loc); 184 185 if (phy_id != 0) 186 return -ENODEV; 187 188 control_read(dev, REQUEST_READ, 0, loc * 2, buff, 0x02, 189 CONTROL_TIMEOUT_MS); 190 191 return (buff[0] | buff[1] << 8); 192 } 193 194 static void ch9200_mdio_write(struct net_device *netdev, 195 int phy_id, int loc, int val) 196 { 197 struct usbnet *dev = netdev_priv(netdev); 198 unsigned char buff[2]; 199 200 netdev_dbg(netdev, "%s() phy_id=%02x loc:%02x\n", 201 __func__, phy_id, loc); 202 203 if (phy_id != 0) 204 return; 205 206 buff[0] = (unsigned char)val; 207 buff[1] = (unsigned char)(val >> 8); 208 209 control_write(dev, REQUEST_WRITE, 0, loc * 2, buff, 0x02, 210 CONTROL_TIMEOUT_MS); 211 } 212 213 static int ch9200_link_reset(struct usbnet *dev) 214 { 215 struct ethtool_cmd ecmd; 216 217 mii_check_media(&dev->mii, 1, 1); 218 mii_ethtool_gset(&dev->mii, &ecmd); 219 220 netdev_dbg(dev->net, "%s() speed:%d duplex:%d\n", 221 __func__, ecmd.speed, ecmd.duplex); 222 223 return 0; 224 } 225 226 static void ch9200_status(struct usbnet *dev, struct urb *urb) 227 { 228 int link; 229 unsigned char *buf; 230 231 if (urb->actual_length < 16) 232 return; 233 234 buf = urb->transfer_buffer; 235 link = !!(buf[0] & 0x01); 236 237 if (link) { 238 netif_carrier_on(dev->net); 239 usbnet_defer_kevent(dev, EVENT_LINK_RESET); 240 } else { 241 netif_carrier_off(dev->net); 242 } 243 } 244 245 static struct sk_buff *ch9200_tx_fixup(struct usbnet *dev, struct sk_buff *skb, 246 gfp_t flags) 247 { 248 int i = 0; 249 int len = 0; 250 int tx_overhead = 0; 251 252 tx_overhead = 0x40; 253 254 len = skb->len; 255 if (skb_cow_head(skb, tx_overhead)) { 256 dev_kfree_skb_any(skb); 257 return NULL; 258 } 259 260 __skb_push(skb, tx_overhead); 261 /* usbnet adds padding if length is a multiple of packet size 262 * if so, adjust length value in header 263 */ 264 if ((skb->len % dev->maxpacket) == 0) 265 len++; 266 267 skb->data[0] = len; 268 skb->data[1] = len >> 8; 269 skb->data[2] = 0x00; 270 skb->data[3] = 0x80; 271 272 for (i = 4; i < 48; i++) 273 skb->data[i] = 0x00; 274 275 skb->data[48] = len; 276 skb->data[49] = len >> 8; 277 skb->data[50] = 0x00; 278 skb->data[51] = 0x80; 279 280 for (i = 52; i < 64; i++) 281 skb->data[i] = 0x00; 282 283 return skb; 284 } 285 286 static int ch9200_rx_fixup(struct usbnet *dev, struct sk_buff *skb) 287 { 288 int len = 0; 289 int rx_overhead = 0; 290 291 rx_overhead = 64; 292 293 if (unlikely(skb->len < rx_overhead)) { 294 dev_err(&dev->udev->dev, "unexpected tiny rx frame\n"); 295 return 0; 296 } 297 298 len = (skb->data[skb->len - 16] | skb->data[skb->len - 15] << 8); 299 skb_trim(skb, len); 300 301 return 1; 302 } 303 304 static int get_mac_address(struct usbnet *dev, unsigned char *data) 305 { 306 int err = 0; 307 unsigned char mac_addr[0x06]; 308 int rd_mac_len = 0; 309 310 netdev_dbg(dev->net, "%s:\n\tusbnet VID:%0x PID:%0x\n", __func__, 311 le16_to_cpu(dev->udev->descriptor.idVendor), 312 le16_to_cpu(dev->udev->descriptor.idProduct)); 313 314 memset(mac_addr, 0, sizeof(mac_addr)); 315 rd_mac_len = control_read(dev, REQUEST_READ, 0, 316 MAC_REG_STATION_L, mac_addr, 0x02, 317 CONTROL_TIMEOUT_MS); 318 rd_mac_len += control_read(dev, REQUEST_READ, 0, MAC_REG_STATION_M, 319 mac_addr + 2, 0x02, CONTROL_TIMEOUT_MS); 320 rd_mac_len += control_read(dev, REQUEST_READ, 0, MAC_REG_STATION_H, 321 mac_addr + 4, 0x02, CONTROL_TIMEOUT_MS); 322 if (rd_mac_len != ETH_ALEN) 323 err = -EINVAL; 324 325 data[0] = mac_addr[5]; 326 data[1] = mac_addr[4]; 327 data[2] = mac_addr[3]; 328 data[3] = mac_addr[2]; 329 data[4] = mac_addr[1]; 330 data[5] = mac_addr[0]; 331 332 return err; 333 } 334 335 static int ch9200_bind(struct usbnet *dev, struct usb_interface *intf) 336 { 337 int retval = 0; 338 unsigned char data[2]; 339 340 retval = usbnet_get_endpoints(dev, intf); 341 if (retval) 342 return retval; 343 344 dev->mii.dev = dev->net; 345 dev->mii.mdio_read = ch9200_mdio_read; 346 dev->mii.mdio_write = ch9200_mdio_write; 347 dev->mii.reg_num_mask = 0x1f; 348 349 dev->mii.phy_id_mask = 0x1f; 350 351 dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len; 352 dev->rx_urb_size = 24 * 64 + 16; 353 mii_nway_restart(&dev->mii); 354 355 data[0] = 0x01; 356 data[1] = 0x0F; 357 retval = control_write(dev, REQUEST_WRITE, 0, MAC_REG_THRESHOLD, data, 358 0x02, CONTROL_TIMEOUT_MS); 359 360 data[0] = 0xA0; 361 data[1] = 0x90; 362 retval = control_write(dev, REQUEST_WRITE, 0, MAC_REG_FIFO_DEPTH, data, 363 0x02, CONTROL_TIMEOUT_MS); 364 365 data[0] = 0x30; 366 data[1] = 0x00; 367 retval = control_write(dev, REQUEST_WRITE, 0, MAC_REG_PAUSE, data, 368 0x02, CONTROL_TIMEOUT_MS); 369 370 data[0] = 0x17; 371 data[1] = 0xD8; 372 retval = control_write(dev, REQUEST_WRITE, 0, MAC_REG_FLOW_CONTROL, 373 data, 0x02, CONTROL_TIMEOUT_MS); 374 375 /* Undocumented register */ 376 data[0] = 0x01; 377 data[1] = 0x00; 378 retval = control_write(dev, REQUEST_WRITE, 0, 254, data, 0x02, 379 CONTROL_TIMEOUT_MS); 380 381 data[0] = 0x5F; 382 data[1] = 0x0D; 383 retval = control_write(dev, REQUEST_WRITE, 0, MAC_REG_CTRL, data, 0x02, 384 CONTROL_TIMEOUT_MS); 385 386 retval = get_mac_address(dev, dev->net->dev_addr); 387 388 return retval; 389 } 390 391 static const struct driver_info ch9200_info = { 392 .description = "CH9200 USB to Network Adaptor", 393 .flags = FLAG_ETHER, 394 .bind = ch9200_bind, 395 .rx_fixup = ch9200_rx_fixup, 396 .tx_fixup = ch9200_tx_fixup, 397 .status = ch9200_status, 398 .link_reset = ch9200_link_reset, 399 .reset = ch9200_link_reset, 400 }; 401 402 static const struct usb_device_id ch9200_products[] = { 403 { 404 USB_DEVICE(0x1A86, 0xE092), 405 .driver_info = (unsigned long)&ch9200_info, 406 }, 407 {}, 408 }; 409 410 MODULE_DEVICE_TABLE(usb, ch9200_products); 411 412 static struct usb_driver ch9200_driver = { 413 .name = "ch9200", 414 .id_table = ch9200_products, 415 .probe = usbnet_probe, 416 .disconnect = usbnet_disconnect, 417 .suspend = usbnet_suspend, 418 .resume = usbnet_resume, 419 }; 420 421 module_usb_driver(ch9200_driver); 422 423 MODULE_DESCRIPTION("QinHeng CH9200 USB Network device"); 424 MODULE_LICENSE("GPL"); 425