drivers/net/usb/ch9200.c

   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");