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Linux/drivers/net/usb/dm9601.c

  1 /*
  2  * Davicom DM96xx USB 10/100Mbps ethernet devices
  3  *
  4  * Peter Korsgaard <jacmet@sunsite.dk>
  5  *
  6  * This file is licensed under the terms of the GNU General Public License
  7  * version 2.  This program is licensed "as is" without any warranty of any
  8  * kind, whether express or implied.
  9  */
 10 
 11 //#define DEBUG
 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 #include <linux/slab.h>
 24 
 25 /* datasheet:
 26  http://ptm2.cc.utu.fi/ftp/network/cards/DM9601/From_NET/DM9601-DS-P01-930914.pdf
 27 */
 28 
 29 /* control requests */
 30 #define DM_READ_REGS    0x00
 31 #define DM_WRITE_REGS   0x01
 32 #define DM_READ_MEMS    0x02
 33 #define DM_WRITE_REG    0x03
 34 #define DM_WRITE_MEMS   0x05
 35 #define DM_WRITE_MEM    0x07
 36 
 37 /* registers */
 38 #define DM_NET_CTRL     0x00
 39 #define DM_RX_CTRL      0x05
 40 #define DM_SHARED_CTRL  0x0b
 41 #define DM_SHARED_ADDR  0x0c
 42 #define DM_SHARED_DATA  0x0d    /* low + high */
 43 #define DM_PHY_ADDR     0x10    /* 6 bytes */
 44 #define DM_MCAST_ADDR   0x16    /* 8 bytes */
 45 #define DM_GPR_CTRL     0x1e
 46 #define DM_GPR_DATA     0x1f
 47 #define DM_CHIP_ID      0x2c
 48 #define DM_MODE_CTRL    0x91    /* only on dm9620 */
 49 
 50 /* chip id values */
 51 #define ID_DM9601       0
 52 #define ID_DM9620       1
 53 
 54 #define DM_MAX_MCAST    64
 55 #define DM_MCAST_SIZE   8
 56 #define DM_EEPROM_LEN   256
 57 #define DM_TX_OVERHEAD  2       /* 2 byte header */
 58 #define DM_RX_OVERHEAD  7       /* 3 byte header + 4 byte crc tail */
 59 #define DM_TIMEOUT      1000
 60 
 61 static int dm_read(struct usbnet *dev, u8 reg, u16 length, void *data)
 62 {
 63         int err;
 64         err = usbnet_read_cmd(dev, DM_READ_REGS,
 65                                USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 66                                0, reg, data, length);
 67         if(err != length && err >= 0)
 68                 err = -EINVAL;
 69         return err;
 70 }
 71 
 72 static int dm_read_reg(struct usbnet *dev, u8 reg, u8 *value)
 73 {
 74         return dm_read(dev, reg, 1, value);
 75 }
 76 
 77 static int dm_write(struct usbnet *dev, u8 reg, u16 length, void *data)
 78 {
 79         int err;
 80         err = usbnet_write_cmd(dev, DM_WRITE_REGS,
 81                                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 82                                 0, reg, data, length);
 83 
 84         if (err >= 0 && err < length)
 85                 err = -EINVAL;
 86         return err;
 87 }
 88 
 89 static int dm_write_reg(struct usbnet *dev, u8 reg, u8 value)
 90 {
 91         return usbnet_write_cmd(dev, DM_WRITE_REG,
 92                                 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
 93                                 value, reg, NULL, 0);
 94 }
 95 
 96 static void dm_write_async(struct usbnet *dev, u8 reg, u16 length, void *data)
 97 {
 98         usbnet_write_cmd_async(dev, DM_WRITE_REGS,
 99                                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
100                                0, reg, data, length);
101 }
102 
103 static void dm_write_reg_async(struct usbnet *dev, u8 reg, u8 value)
104 {
105         usbnet_write_cmd_async(dev, DM_WRITE_REG,
106                                USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
107                                value, reg, NULL, 0);
108 }
109 
110 static int dm_read_shared_word(struct usbnet *dev, int phy, u8 reg, __le16 *value)
111 {
112         int ret, i;
113 
114         mutex_lock(&dev->phy_mutex);
115 
116         dm_write_reg(dev, DM_SHARED_ADDR, phy ? (reg | 0x40) : reg);
117         dm_write_reg(dev, DM_SHARED_CTRL, phy ? 0xc : 0x4);
118 
119         for (i = 0; i < DM_TIMEOUT; i++) {
120                 u8 tmp = 0;
121 
122                 udelay(1);
123                 ret = dm_read_reg(dev, DM_SHARED_CTRL, &tmp);
124                 if (ret < 0)
125                         goto out;
126 
127                 /* ready */
128                 if ((tmp & 1) == 0)
129                         break;
130         }
131 
132         if (i == DM_TIMEOUT) {
133                 netdev_err(dev->net, "%s read timed out!\n", phy ? "phy" : "eeprom");
134                 ret = -EIO;
135                 goto out;
136         }
137 
138         dm_write_reg(dev, DM_SHARED_CTRL, 0x0);
139         ret = dm_read(dev, DM_SHARED_DATA, 2, value);
140 
141         netdev_dbg(dev->net, "read shared %d 0x%02x returned 0x%04x, %d\n",
142                    phy, reg, *value, ret);
143 
144  out:
145         mutex_unlock(&dev->phy_mutex);
146         return ret;
147 }
148 
149 static int dm_write_shared_word(struct usbnet *dev, int phy, u8 reg, __le16 value)
150 {
151         int ret, i;
152 
153         mutex_lock(&dev->phy_mutex);
154 
155         ret = dm_write(dev, DM_SHARED_DATA, 2, &value);
156         if (ret < 0)
157                 goto out;
158 
159         dm_write_reg(dev, DM_SHARED_ADDR, phy ? (reg | 0x40) : reg);
160         dm_write_reg(dev, DM_SHARED_CTRL, phy ? 0x1a : 0x12);
161 
162         for (i = 0; i < DM_TIMEOUT; i++) {
163                 u8 tmp = 0;
164 
165                 udelay(1);
166                 ret = dm_read_reg(dev, DM_SHARED_CTRL, &tmp);
167                 if (ret < 0)
168                         goto out;
169 
170                 /* ready */
171                 if ((tmp & 1) == 0)
172                         break;
173         }
174 
175         if (i == DM_TIMEOUT) {
176                 netdev_err(dev->net, "%s write timed out!\n", phy ? "phy" : "eeprom");
177                 ret = -EIO;
178                 goto out;
179         }
180 
181         dm_write_reg(dev, DM_SHARED_CTRL, 0x0);
182 
183 out:
184         mutex_unlock(&dev->phy_mutex);
185         return ret;
186 }
187 
188 static int dm_read_eeprom_word(struct usbnet *dev, u8 offset, void *value)
189 {
190         return dm_read_shared_word(dev, 0, offset, value);
191 }
192 
193 
194 
195 static int dm9601_get_eeprom_len(struct net_device *dev)
196 {
197         return DM_EEPROM_LEN;
198 }
199 
200 static int dm9601_get_eeprom(struct net_device *net,
201                              struct ethtool_eeprom *eeprom, u8 * data)
202 {
203         struct usbnet *dev = netdev_priv(net);
204         __le16 *ebuf = (__le16 *) data;
205         int i;
206 
207         /* access is 16bit */
208         if ((eeprom->offset % 2) || (eeprom->len % 2))
209                 return -EINVAL;
210 
211         for (i = 0; i < eeprom->len / 2; i++) {
212                 if (dm_read_eeprom_word(dev, eeprom->offset / 2 + i,
213                                         &ebuf[i]) < 0)
214                         return -EINVAL;
215         }
216         return 0;
217 }
218 
219 static int dm9601_mdio_read(struct net_device *netdev, int phy_id, int loc)
220 {
221         struct usbnet *dev = netdev_priv(netdev);
222 
223         __le16 res;
224 
225         if (phy_id) {
226                 netdev_dbg(dev->net, "Only internal phy supported\n");
227                 return 0;
228         }
229 
230         dm_read_shared_word(dev, 1, loc, &res);
231 
232         netdev_dbg(dev->net,
233                    "dm9601_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x\n",
234                    phy_id, loc, le16_to_cpu(res));
235 
236         return le16_to_cpu(res);
237 }
238 
239 static void dm9601_mdio_write(struct net_device *netdev, int phy_id, int loc,
240                               int val)
241 {
242         struct usbnet *dev = netdev_priv(netdev);
243         __le16 res = cpu_to_le16(val);
244 
245         if (phy_id) {
246                 netdev_dbg(dev->net, "Only internal phy supported\n");
247                 return;
248         }
249 
250         netdev_dbg(dev->net, "dm9601_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x\n",
251                    phy_id, loc, val);
252 
253         dm_write_shared_word(dev, 1, loc, res);
254 }
255 
256 static void dm9601_get_drvinfo(struct net_device *net,
257                                struct ethtool_drvinfo *info)
258 {
259         /* Inherit standard device info */
260         usbnet_get_drvinfo(net, info);
261 }
262 
263 static u32 dm9601_get_link(struct net_device *net)
264 {
265         struct usbnet *dev = netdev_priv(net);
266 
267         return mii_link_ok(&dev->mii);
268 }
269 
270 static int dm9601_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
271 {
272         struct usbnet *dev = netdev_priv(net);
273 
274         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
275 }
276 
277 static const struct ethtool_ops dm9601_ethtool_ops = {
278         .get_drvinfo    = dm9601_get_drvinfo,
279         .get_link       = dm9601_get_link,
280         .get_msglevel   = usbnet_get_msglevel,
281         .set_msglevel   = usbnet_set_msglevel,
282         .get_eeprom_len = dm9601_get_eeprom_len,
283         .get_eeprom     = dm9601_get_eeprom,
284         .get_settings   = usbnet_get_settings,
285         .set_settings   = usbnet_set_settings,
286         .nway_reset     = usbnet_nway_reset,
287 };
288 
289 static void dm9601_set_multicast(struct net_device *net)
290 {
291         struct usbnet *dev = netdev_priv(net);
292         /* We use the 20 byte dev->data for our 8 byte filter buffer
293          * to avoid allocating memory that is tricky to free later */
294         u8 *hashes = (u8 *) & dev->data;
295         u8 rx_ctl = 0x31;
296 
297         memset(hashes, 0x00, DM_MCAST_SIZE);
298         hashes[DM_MCAST_SIZE - 1] |= 0x80;      /* broadcast address */
299 
300         if (net->flags & IFF_PROMISC) {
301                 rx_ctl |= 0x02;
302         } else if (net->flags & IFF_ALLMULTI ||
303                    netdev_mc_count(net) > DM_MAX_MCAST) {
304                 rx_ctl |= 0x08;
305         } else if (!netdev_mc_empty(net)) {
306                 struct netdev_hw_addr *ha;
307 
308                 netdev_for_each_mc_addr(ha, net) {
309                         u32 crc = ether_crc(ETH_ALEN, ha->addr) >> 26;
310                         hashes[crc >> 3] |= 1 << (crc & 0x7);
311                 }
312         }
313 
314         dm_write_async(dev, DM_MCAST_ADDR, DM_MCAST_SIZE, hashes);
315         dm_write_reg_async(dev, DM_RX_CTRL, rx_ctl);
316 }
317 
318 static void __dm9601_set_mac_address(struct usbnet *dev)
319 {
320         dm_write_async(dev, DM_PHY_ADDR, ETH_ALEN, dev->net->dev_addr);
321 }
322 
323 static int dm9601_set_mac_address(struct net_device *net, void *p)
324 {
325         struct sockaddr *addr = p;
326         struct usbnet *dev = netdev_priv(net);
327 
328         if (!is_valid_ether_addr(addr->sa_data)) {
329                 dev_err(&net->dev, "not setting invalid mac address %pM\n",
330                                                                 addr->sa_data);
331                 return -EINVAL;
332         }
333 
334         memcpy(net->dev_addr, addr->sa_data, net->addr_len);
335         __dm9601_set_mac_address(dev);
336 
337         return 0;
338 }
339 
340 static const struct net_device_ops dm9601_netdev_ops = {
341         .ndo_open               = usbnet_open,
342         .ndo_stop               = usbnet_stop,
343         .ndo_start_xmit         = usbnet_start_xmit,
344         .ndo_tx_timeout         = usbnet_tx_timeout,
345         .ndo_change_mtu         = usbnet_change_mtu,
346         .ndo_validate_addr      = eth_validate_addr,
347         .ndo_do_ioctl           = dm9601_ioctl,
348         .ndo_set_rx_mode        = dm9601_set_multicast,
349         .ndo_set_mac_address    = dm9601_set_mac_address,
350 };
351 
352 static int dm9601_bind(struct usbnet *dev, struct usb_interface *intf)
353 {
354         int ret;
355         u8 mac[ETH_ALEN], id;
356 
357         ret = usbnet_get_endpoints(dev, intf);
358         if (ret)
359                 goto out;
360 
361         dev->net->netdev_ops = &dm9601_netdev_ops;
362         dev->net->ethtool_ops = &dm9601_ethtool_ops;
363         dev->net->hard_header_len += DM_TX_OVERHEAD;
364         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
365 
366         /* dm9620/21a require room for 4 byte padding, even in dm9601
367          * mode, so we need +1 to be able to receive full size
368          * ethernet frames.
369          */
370         dev->rx_urb_size = dev->net->mtu + ETH_HLEN + DM_RX_OVERHEAD + 1;
371 
372         dev->mii.dev = dev->net;
373         dev->mii.mdio_read = dm9601_mdio_read;
374         dev->mii.mdio_write = dm9601_mdio_write;
375         dev->mii.phy_id_mask = 0x1f;
376         dev->mii.reg_num_mask = 0x1f;
377 
378         /* reset */
379         dm_write_reg(dev, DM_NET_CTRL, 1);
380         udelay(20);
381 
382         /* read MAC */
383         if (dm_read(dev, DM_PHY_ADDR, ETH_ALEN, mac) < 0) {
384                 printk(KERN_ERR "Error reading MAC address\n");
385                 ret = -ENODEV;
386                 goto out;
387         }
388 
389         /*
390          * Overwrite the auto-generated address only with good ones.
391          */
392         if (is_valid_ether_addr(mac))
393                 memcpy(dev->net->dev_addr, mac, ETH_ALEN);
394         else {
395                 printk(KERN_WARNING
396                         "dm9601: No valid MAC address in EEPROM, using %pM\n",
397                         dev->net->dev_addr);
398                 __dm9601_set_mac_address(dev);
399         }
400 
401         if (dm_read_reg(dev, DM_CHIP_ID, &id) < 0) {
402                 netdev_err(dev->net, "Error reading chip ID\n");
403                 ret = -ENODEV;
404                 goto out;
405         }
406 
407         /* put dm9620 devices in dm9601 mode */
408         if (id == ID_DM9620) {
409                 u8 mode;
410 
411                 if (dm_read_reg(dev, DM_MODE_CTRL, &mode) < 0) {
412                         netdev_err(dev->net, "Error reading MODE_CTRL\n");
413                         ret = -ENODEV;
414                         goto out;
415                 }
416                 dm_write_reg(dev, DM_MODE_CTRL, mode & 0x7f);
417         }
418 
419         /* power up phy */
420         dm_write_reg(dev, DM_GPR_CTRL, 1);
421         dm_write_reg(dev, DM_GPR_DATA, 0);
422 
423         /* receive broadcast packets */
424         dm9601_set_multicast(dev->net);
425 
426         dm9601_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
427         dm9601_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
428                           ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP);
429         mii_nway_restart(&dev->mii);
430 
431 out:
432         return ret;
433 }
434 
435 static int dm9601_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
436 {
437         u8 status;
438         int len;
439 
440         /* format:
441            b1: rx status
442            b2: packet length (incl crc) low
443            b3: packet length (incl crc) high
444            b4..n-4: packet data
445            bn-3..bn: ethernet crc
446          */
447 
448         if (unlikely(skb->len < DM_RX_OVERHEAD)) {
449                 dev_err(&dev->udev->dev, "unexpected tiny rx frame\n");
450                 return 0;
451         }
452 
453         status = skb->data[0];
454         len = (skb->data[1] | (skb->data[2] << 8)) - 4;
455 
456         if (unlikely(status & 0xbf)) {
457                 if (status & 0x01) dev->net->stats.rx_fifo_errors++;
458                 if (status & 0x02) dev->net->stats.rx_crc_errors++;
459                 if (status & 0x04) dev->net->stats.rx_frame_errors++;
460                 if (status & 0x20) dev->net->stats.rx_missed_errors++;
461                 if (status & 0x90) dev->net->stats.rx_length_errors++;
462                 return 0;
463         }
464 
465         skb_pull(skb, 3);
466         skb_trim(skb, len);
467 
468         return 1;
469 }
470 
471 static struct sk_buff *dm9601_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
472                                        gfp_t flags)
473 {
474         int len, pad;
475 
476         /* format:
477            b1: packet length low
478            b2: packet length high
479            b3..n: packet data
480         */
481 
482         len = skb->len + DM_TX_OVERHEAD;
483 
484         /* workaround for dm962x errata with tx fifo getting out of
485          * sync if a USB bulk transfer retry happens right after a
486          * packet with odd / maxpacket length by adding up to 3 bytes
487          * padding.
488          */
489         while ((len & 1) || !(len % dev->maxpacket))
490                 len++;
491 
492         len -= DM_TX_OVERHEAD; /* hw header doesn't count as part of length */
493         pad = len - skb->len;
494 
495         if (skb_headroom(skb) < DM_TX_OVERHEAD || skb_tailroom(skb) < pad) {
496                 struct sk_buff *skb2;
497 
498                 skb2 = skb_copy_expand(skb, DM_TX_OVERHEAD, pad, flags);
499                 dev_kfree_skb_any(skb);
500                 skb = skb2;
501                 if (!skb)
502                         return NULL;
503         }
504 
505         __skb_push(skb, DM_TX_OVERHEAD);
506 
507         if (pad) {
508                 memset(skb->data + skb->len, 0, pad);
509                 __skb_put(skb, pad);
510         }
511 
512         skb->data[0] = len;
513         skb->data[1] = len >> 8;
514 
515         return skb;
516 }
517 
518 static void dm9601_status(struct usbnet *dev, struct urb *urb)
519 {
520         int link;
521         u8 *buf;
522 
523         /* format:
524            b0: net status
525            b1: tx status 1
526            b2: tx status 2
527            b3: rx status
528            b4: rx overflow
529            b5: rx count
530            b6: tx count
531            b7: gpr
532         */
533 
534         if (urb->actual_length < 8)
535                 return;
536 
537         buf = urb->transfer_buffer;
538 
539         link = !!(buf[0] & 0x40);
540         if (netif_carrier_ok(dev->net) != link) {
541                 usbnet_link_change(dev, link, 1);
542                 netdev_dbg(dev->net, "Link Status is: %d\n", link);
543         }
544 }
545 
546 static int dm9601_link_reset(struct usbnet *dev)
547 {
548         struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
549 
550         mii_check_media(&dev->mii, 1, 1);
551         mii_ethtool_gset(&dev->mii, &ecmd);
552 
553         netdev_dbg(dev->net, "link_reset() speed: %u duplex: %d\n",
554                    ethtool_cmd_speed(&ecmd), ecmd.duplex);
555 
556         return 0;
557 }
558 
559 static const struct driver_info dm9601_info = {
560         .description    = "Davicom DM96xx USB 10/100 Ethernet",
561         .flags          = FLAG_ETHER | FLAG_LINK_INTR,
562         .bind           = dm9601_bind,
563         .rx_fixup       = dm9601_rx_fixup,
564         .tx_fixup       = dm9601_tx_fixup,
565         .status         = dm9601_status,
566         .link_reset     = dm9601_link_reset,
567         .reset          = dm9601_link_reset,
568 };
569 
570 static const struct usb_device_id products[] = {
571         {
572          USB_DEVICE(0x07aa, 0x9601),    /* Corega FEther USB-TXC */
573          .driver_info = (unsigned long)&dm9601_info,
574          },
575         {
576          USB_DEVICE(0x0a46, 0x9601),    /* Davicom USB-100 */
577          .driver_info = (unsigned long)&dm9601_info,
578          },
579         {
580          USB_DEVICE(0x0a46, 0x6688),    /* ZT6688 USB NIC */
581          .driver_info = (unsigned long)&dm9601_info,
582          },
583         {
584          USB_DEVICE(0x0a46, 0x0268),    /* ShanTou ST268 USB NIC */
585          .driver_info = (unsigned long)&dm9601_info,
586          },
587         {
588          USB_DEVICE(0x0a46, 0x8515),    /* ADMtek ADM8515 USB NIC */
589          .driver_info = (unsigned long)&dm9601_info,
590          },
591         {
592         USB_DEVICE(0x0a47, 0x9601),     /* Hirose USB-100 */
593         .driver_info = (unsigned long)&dm9601_info,
594          },
595         {
596         USB_DEVICE(0x0fe6, 0x8101),     /* DM9601 USB to Fast Ethernet Adapter */
597         .driver_info = (unsigned long)&dm9601_info,
598          },
599         {
600          USB_DEVICE(0x0fe6, 0x9700),    /* DM9601 USB to Fast Ethernet Adapter */
601          .driver_info = (unsigned long)&dm9601_info,
602          },
603         {
604          USB_DEVICE(0x0a46, 0x9000),    /* DM9000E */
605          .driver_info = (unsigned long)&dm9601_info,
606          },
607         {
608          USB_DEVICE(0x0a46, 0x9620),    /* DM9620 USB to Fast Ethernet Adapter */
609          .driver_info = (unsigned long)&dm9601_info,
610          },
611         {
612          USB_DEVICE(0x0a46, 0x9621),    /* DM9621A USB to Fast Ethernet Adapter */
613          .driver_info = (unsigned long)&dm9601_info,
614         },
615         {
616          USB_DEVICE(0x0a46, 0x9622),    /* DM9622 USB to Fast Ethernet Adapter */
617          .driver_info = (unsigned long)&dm9601_info,
618         },
619         {
620          USB_DEVICE(0x0a46, 0x0269),    /* DM962OA USB to Fast Ethernet Adapter */
621          .driver_info = (unsigned long)&dm9601_info,
622         },
623         {
624          USB_DEVICE(0x0a46, 0x1269),    /* DM9621A USB to Fast Ethernet Adapter */
625          .driver_info = (unsigned long)&dm9601_info,
626         },
627         {},                     // END
628 };
629 
630 MODULE_DEVICE_TABLE(usb, products);
631 
632 static struct usb_driver dm9601_driver = {
633         .name = "dm9601",
634         .id_table = products,
635         .probe = usbnet_probe,
636         .disconnect = usbnet_disconnect,
637         .suspend = usbnet_suspend,
638         .resume = usbnet_resume,
639         .disable_hub_initiated_lpm = 1,
640 };
641 
642 module_usb_driver(dm9601_driver);
643 
644 MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>");
645 MODULE_DESCRIPTION("Davicom DM96xx USB 10/100 ethernet devices");
646 MODULE_LICENSE("GPL");
647 

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