Merge branches 'core/futexes', 'core/locking', 'core/rcu' and 'linus' into core/urgent
[linux-2.6] / drivers / net / usb / dm9601.c
1 /*
2  * Davicom DM9601 USB 1.1 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/init.h>
17 #include <linux/netdevice.h>
18 #include <linux/etherdevice.h>
19 #include <linux/ethtool.h>
20 #include <linux/mii.h>
21 #include <linux/usb.h>
22 #include <linux/crc32.h>
23 #include <linux/usb/usbnet.h>
24
25 /* datasheet:
26  http://www.davicom.com.tw/big5/download/Data%20Sheet/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
48 #define DM_MAX_MCAST    64
49 #define DM_MCAST_SIZE   8
50 #define DM_EEPROM_LEN   256
51 #define DM_TX_OVERHEAD  2       /* 2 byte header */
52 #define DM_RX_OVERHEAD  7       /* 3 byte header + 4 byte crc tail */
53 #define DM_TIMEOUT      1000
54
55
56 static int dm_read(struct usbnet *dev, u8 reg, u16 length, void *data)
57 {
58         void *buf;
59         int err = -ENOMEM;
60
61         devdbg(dev, "dm_read() reg=0x%02x length=%d", reg, length);
62
63         buf = kmalloc(length, GFP_KERNEL);
64         if (!buf)
65                 goto out;
66
67         err = usb_control_msg(dev->udev,
68                               usb_rcvctrlpipe(dev->udev, 0),
69                               DM_READ_REGS,
70                               USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
71                               0, reg, buf, length, USB_CTRL_SET_TIMEOUT);
72         if (err == length)
73                 memcpy(data, buf, length);
74         else if (err >= 0)
75                 err = -EINVAL;
76         kfree(buf);
77
78  out:
79         return err;
80 }
81
82 static int dm_read_reg(struct usbnet *dev, u8 reg, u8 *value)
83 {
84         return dm_read(dev, reg, 1, value);
85 }
86
87 static int dm_write(struct usbnet *dev, u8 reg, u16 length, void *data)
88 {
89         void *buf = NULL;
90         int err = -ENOMEM;
91
92         devdbg(dev, "dm_write() reg=0x%02x, length=%d", reg, length);
93
94         if (data) {
95                 buf = kmalloc(length, GFP_KERNEL);
96                 if (!buf)
97                         goto out;
98                 memcpy(buf, data, length);
99         }
100
101         err = usb_control_msg(dev->udev,
102                               usb_sndctrlpipe(dev->udev, 0),
103                               DM_WRITE_REGS,
104                               USB_DIR_OUT | USB_TYPE_VENDOR |USB_RECIP_DEVICE,
105                               0, reg, buf, length, USB_CTRL_SET_TIMEOUT);
106         kfree(buf);
107         if (err >= 0 && err < length)
108                 err = -EINVAL;
109  out:
110         return err;
111 }
112
113 static int dm_write_reg(struct usbnet *dev, u8 reg, u8 value)
114 {
115         devdbg(dev, "dm_write_reg() reg=0x%02x, value=0x%02x", reg, value);
116         return usb_control_msg(dev->udev,
117                                usb_sndctrlpipe(dev->udev, 0),
118                                DM_WRITE_REG,
119                                USB_DIR_OUT | USB_TYPE_VENDOR |USB_RECIP_DEVICE,
120                                value, reg, NULL, 0, USB_CTRL_SET_TIMEOUT);
121 }
122
123 static void dm_write_async_callback(struct urb *urb)
124 {
125         struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
126         int status = urb->status;
127
128         if (status < 0)
129                 printk(KERN_DEBUG "dm_write_async_callback() failed with %d\n",
130                        status);
131
132         kfree(req);
133         usb_free_urb(urb);
134 }
135
136 static void dm_write_async_helper(struct usbnet *dev, u8 reg, u8 value,
137                                   u16 length, void *data)
138 {
139         struct usb_ctrlrequest *req;
140         struct urb *urb;
141         int status;
142
143         urb = usb_alloc_urb(0, GFP_ATOMIC);
144         if (!urb) {
145                 deverr(dev, "Error allocating URB in dm_write_async_helper!");
146                 return;
147         }
148
149         req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC);
150         if (!req) {
151                 deverr(dev, "Failed to allocate memory for control request");
152                 usb_free_urb(urb);
153                 return;
154         }
155
156         req->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
157         req->bRequest = length ? DM_WRITE_REGS : DM_WRITE_REG;
158         req->wValue = cpu_to_le16(value);
159         req->wIndex = cpu_to_le16(reg);
160         req->wLength = cpu_to_le16(length);
161
162         usb_fill_control_urb(urb, dev->udev,
163                              usb_sndctrlpipe(dev->udev, 0),
164                              (void *)req, data, length,
165                              dm_write_async_callback, req);
166
167         status = usb_submit_urb(urb, GFP_ATOMIC);
168         if (status < 0) {
169                 deverr(dev, "Error submitting the control message: status=%d",
170                        status);
171                 kfree(req);
172                 usb_free_urb(urb);
173         }
174 }
175
176 static void dm_write_async(struct usbnet *dev, u8 reg, u16 length, void *data)
177 {
178         devdbg(dev, "dm_write_async() reg=0x%02x length=%d", reg, length);
179
180         dm_write_async_helper(dev, reg, 0, length, data);
181 }
182
183 static void dm_write_reg_async(struct usbnet *dev, u8 reg, u8 value)
184 {
185         devdbg(dev, "dm_write_reg_async() reg=0x%02x value=0x%02x",
186                reg, value);
187
188         dm_write_async_helper(dev, reg, value, 0, NULL);
189 }
190
191 static int dm_read_shared_word(struct usbnet *dev, int phy, u8 reg, __le16 *value)
192 {
193         int ret, i;
194
195         mutex_lock(&dev->phy_mutex);
196
197         dm_write_reg(dev, DM_SHARED_ADDR, phy ? (reg | 0x40) : reg);
198         dm_write_reg(dev, DM_SHARED_CTRL, phy ? 0xc : 0x4);
199
200         for (i = 0; i < DM_TIMEOUT; i++) {
201                 u8 tmp;
202
203                 udelay(1);
204                 ret = dm_read_reg(dev, DM_SHARED_CTRL, &tmp);
205                 if (ret < 0)
206                         goto out;
207
208                 /* ready */
209                 if ((tmp & 1) == 0)
210                         break;
211         }
212
213         if (i == DM_TIMEOUT) {
214                 deverr(dev, "%s read timed out!", phy ? "phy" : "eeprom");
215                 ret = -EIO;
216                 goto out;
217         }
218
219         dm_write_reg(dev, DM_SHARED_CTRL, 0x0);
220         ret = dm_read(dev, DM_SHARED_DATA, 2, value);
221
222         devdbg(dev, "read shared %d 0x%02x returned 0x%04x, %d",
223                phy, reg, *value, ret);
224
225  out:
226         mutex_unlock(&dev->phy_mutex);
227         return ret;
228 }
229
230 static int dm_write_shared_word(struct usbnet *dev, int phy, u8 reg, __le16 value)
231 {
232         int ret, i;
233
234         mutex_lock(&dev->phy_mutex);
235
236         ret = dm_write(dev, DM_SHARED_DATA, 2, &value);
237         if (ret < 0)
238                 goto out;
239
240         dm_write_reg(dev, DM_SHARED_ADDR, phy ? (reg | 0x40) : reg);
241         dm_write_reg(dev, DM_SHARED_CTRL, phy ? 0x1c : 0x14);
242
243         for (i = 0; i < DM_TIMEOUT; i++) {
244                 u8 tmp;
245
246                 udelay(1);
247                 ret = dm_read_reg(dev, DM_SHARED_CTRL, &tmp);
248                 if (ret < 0)
249                         goto out;
250
251                 /* ready */
252                 if ((tmp & 1) == 0)
253                         break;
254         }
255
256         if (i == DM_TIMEOUT) {
257                 deverr(dev, "%s write timed out!", phy ? "phy" : "eeprom");
258                 ret = -EIO;
259                 goto out;
260         }
261
262         dm_write_reg(dev, DM_SHARED_CTRL, 0x0);
263
264 out:
265         mutex_unlock(&dev->phy_mutex);
266         return ret;
267 }
268
269 static int dm_read_eeprom_word(struct usbnet *dev, u8 offset, void *value)
270 {
271         return dm_read_shared_word(dev, 0, offset, value);
272 }
273
274
275
276 static int dm9601_get_eeprom_len(struct net_device *dev)
277 {
278         return DM_EEPROM_LEN;
279 }
280
281 static int dm9601_get_eeprom(struct net_device *net,
282                              struct ethtool_eeprom *eeprom, u8 * data)
283 {
284         struct usbnet *dev = netdev_priv(net);
285         __le16 *ebuf = (__le16 *) data;
286         int i;
287
288         /* access is 16bit */
289         if ((eeprom->offset % 2) || (eeprom->len % 2))
290                 return -EINVAL;
291
292         for (i = 0; i < eeprom->len / 2; i++) {
293                 if (dm_read_eeprom_word(dev, eeprom->offset / 2 + i,
294                                         &ebuf[i]) < 0)
295                         return -EINVAL;
296         }
297         return 0;
298 }
299
300 static int dm9601_mdio_read(struct net_device *netdev, int phy_id, int loc)
301 {
302         struct usbnet *dev = netdev_priv(netdev);
303
304         __le16 res;
305
306         if (phy_id) {
307                 devdbg(dev, "Only internal phy supported");
308                 return 0;
309         }
310
311         dm_read_shared_word(dev, 1, loc, &res);
312
313         devdbg(dev,
314                "dm9601_mdio_read() phy_id=0x%02x, loc=0x%02x, returns=0x%04x",
315                phy_id, loc, le16_to_cpu(res));
316
317         return le16_to_cpu(res);
318 }
319
320 static void dm9601_mdio_write(struct net_device *netdev, int phy_id, int loc,
321                               int val)
322 {
323         struct usbnet *dev = netdev_priv(netdev);
324         __le16 res = cpu_to_le16(val);
325
326         if (phy_id) {
327                 devdbg(dev, "Only internal phy supported");
328                 return;
329         }
330
331         devdbg(dev,"dm9601_mdio_write() phy_id=0x%02x, loc=0x%02x, val=0x%04x",
332                phy_id, loc, val);
333
334         dm_write_shared_word(dev, 1, loc, res);
335 }
336
337 static void dm9601_get_drvinfo(struct net_device *net,
338                                struct ethtool_drvinfo *info)
339 {
340         /* Inherit standard device info */
341         usbnet_get_drvinfo(net, info);
342         info->eedump_len = DM_EEPROM_LEN;
343 }
344
345 static u32 dm9601_get_link(struct net_device *net)
346 {
347         struct usbnet *dev = netdev_priv(net);
348
349         return mii_link_ok(&dev->mii);
350 }
351
352 static int dm9601_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
353 {
354         struct usbnet *dev = netdev_priv(net);
355
356         return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
357 }
358
359 static struct ethtool_ops dm9601_ethtool_ops = {
360         .get_drvinfo    = dm9601_get_drvinfo,
361         .get_link       = dm9601_get_link,
362         .get_msglevel   = usbnet_get_msglevel,
363         .set_msglevel   = usbnet_set_msglevel,
364         .get_eeprom_len = dm9601_get_eeprom_len,
365         .get_eeprom     = dm9601_get_eeprom,
366         .get_settings   = usbnet_get_settings,
367         .set_settings   = usbnet_set_settings,
368         .nway_reset     = usbnet_nway_reset,
369 };
370
371 static void dm9601_set_multicast(struct net_device *net)
372 {
373         struct usbnet *dev = netdev_priv(net);
374         /* We use the 20 byte dev->data for our 8 byte filter buffer
375          * to avoid allocating memory that is tricky to free later */
376         u8 *hashes = (u8 *) & dev->data;
377         u8 rx_ctl = 0x31;
378
379         memset(hashes, 0x00, DM_MCAST_SIZE);
380         hashes[DM_MCAST_SIZE - 1] |= 0x80;      /* broadcast address */
381
382         if (net->flags & IFF_PROMISC) {
383                 rx_ctl |= 0x02;
384         } else if (net->flags & IFF_ALLMULTI || net->mc_count > DM_MAX_MCAST) {
385                 rx_ctl |= 0x04;
386         } else if (net->mc_count) {
387                 struct dev_mc_list *mc_list = net->mc_list;
388                 int i;
389
390                 for (i = 0; i < net->mc_count; i++, mc_list = mc_list->next) {
391                         u32 crc = ether_crc(ETH_ALEN, mc_list->dmi_addr) >> 26;
392                         hashes[crc >> 3] |= 1 << (crc & 0x7);
393                 }
394         }
395
396         dm_write_async(dev, DM_MCAST_ADDR, DM_MCAST_SIZE, hashes);
397         dm_write_reg_async(dev, DM_RX_CTRL, rx_ctl);
398 }
399
400 static int dm9601_set_mac_address(struct net_device *net, void *p)
401 {
402         struct sockaddr *addr = p;
403         struct usbnet *dev = netdev_priv(net);
404
405         if (!is_valid_ether_addr(addr->sa_data))
406                 return -EINVAL;
407
408         memcpy(net->dev_addr, addr->sa_data, net->addr_len);
409         dm_write_async(dev, DM_PHY_ADDR, net->addr_len, net->dev_addr);
410
411         return 0;
412 }
413
414 static int dm9601_bind(struct usbnet *dev, struct usb_interface *intf)
415 {
416         int ret;
417
418         ret = usbnet_get_endpoints(dev, intf);
419         if (ret)
420                 goto out;
421
422         dev->net->do_ioctl = dm9601_ioctl;
423         dev->net->set_multicast_list = dm9601_set_multicast;
424         dev->net->set_mac_address = dm9601_set_mac_address;
425         dev->net->ethtool_ops = &dm9601_ethtool_ops;
426         dev->net->hard_header_len += DM_TX_OVERHEAD;
427         dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
428         dev->rx_urb_size = dev->net->mtu + ETH_HLEN + DM_RX_OVERHEAD;
429
430         dev->mii.dev = dev->net;
431         dev->mii.mdio_read = dm9601_mdio_read;
432         dev->mii.mdio_write = dm9601_mdio_write;
433         dev->mii.phy_id_mask = 0x1f;
434         dev->mii.reg_num_mask = 0x1f;
435
436         /* reset */
437         dm_write_reg(dev, DM_NET_CTRL, 1);
438         udelay(20);
439
440         /* read MAC */
441         if (dm_read(dev, DM_PHY_ADDR, ETH_ALEN, dev->net->dev_addr) < 0) {
442                 printk(KERN_ERR "Error reading MAC address\n");
443                 ret = -ENODEV;
444                 goto out;
445         }
446
447         /* power up phy */
448         dm_write_reg(dev, DM_GPR_CTRL, 1);
449         dm_write_reg(dev, DM_GPR_DATA, 0);
450
451         /* receive broadcast packets */
452         dm9601_set_multicast(dev->net);
453
454         dm9601_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
455         dm9601_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
456                           ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP);
457         mii_nway_restart(&dev->mii);
458
459 out:
460         return ret;
461 }
462
463 static int dm9601_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
464 {
465         u8 status;
466         int len;
467
468         /* format:
469            b0: rx status
470            b1: packet length (incl crc) low
471            b2: packet length (incl crc) high
472            b3..n-4: packet data
473            bn-3..bn: ethernet crc
474          */
475
476         if (unlikely(skb->len < DM_RX_OVERHEAD)) {
477                 dev_err(&dev->udev->dev, "unexpected tiny rx frame\n");
478                 return 0;
479         }
480
481         status = skb->data[0];
482         len = (skb->data[1] | (skb->data[2] << 8)) - 4;
483
484         if (unlikely(status & 0xbf)) {
485                 if (status & 0x01) dev->stats.rx_fifo_errors++;
486                 if (status & 0x02) dev->stats.rx_crc_errors++;
487                 if (status & 0x04) dev->stats.rx_frame_errors++;
488                 if (status & 0x20) dev->stats.rx_missed_errors++;
489                 if (status & 0x90) dev->stats.rx_length_errors++;
490                 return 0;
491         }
492
493         skb_pull(skb, 3);
494         skb_trim(skb, len);
495
496         return 1;
497 }
498
499 static struct sk_buff *dm9601_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
500                                        gfp_t flags)
501 {
502         int len;
503
504         /* format:
505            b0: packet length low
506            b1: packet length high
507            b3..n: packet data
508         */
509
510         len = skb->len;
511
512         if (skb_headroom(skb) < DM_TX_OVERHEAD) {
513                 struct sk_buff *skb2;
514
515                 skb2 = skb_copy_expand(skb, DM_TX_OVERHEAD, 0, flags);
516                 dev_kfree_skb_any(skb);
517                 skb = skb2;
518                 if (!skb)
519                         return NULL;
520         }
521
522         __skb_push(skb, DM_TX_OVERHEAD);
523
524         /* usbnet adds padding if length is a multiple of packet size
525            if so, adjust length value in header */
526         if ((skb->len % dev->maxpacket) == 0)
527                 len++;
528
529         skb->data[0] = len;
530         skb->data[1] = len >> 8;
531
532         return skb;
533 }
534
535 static void dm9601_status(struct usbnet *dev, struct urb *urb)
536 {
537         int link;
538         u8 *buf;
539
540         /* format:
541            b0: net status
542            b1: tx status 1
543            b2: tx status 2
544            b3: rx status
545            b4: rx overflow
546            b5: rx count
547            b6: tx count
548            b7: gpr
549         */
550
551         if (urb->actual_length < 8)
552                 return;
553
554         buf = urb->transfer_buffer;
555
556         link = !!(buf[0] & 0x40);
557         if (netif_carrier_ok(dev->net) != link) {
558                 if (link) {
559                         netif_carrier_on(dev->net);
560                         usbnet_defer_kevent (dev, EVENT_LINK_RESET);
561                 }
562                 else
563                         netif_carrier_off(dev->net);
564                 devdbg(dev, "Link Status is: %d", link);
565         }
566 }
567
568 static int dm9601_link_reset(struct usbnet *dev)
569 {
570         struct ethtool_cmd ecmd;
571
572         mii_check_media(&dev->mii, 1, 1);
573         mii_ethtool_gset(&dev->mii, &ecmd);
574
575         devdbg(dev, "link_reset() speed: %d duplex: %d",
576                ecmd.speed, ecmd.duplex);
577
578         return 0;
579 }
580
581 static const struct driver_info dm9601_info = {
582         .description    = "Davicom DM9601 USB Ethernet",
583         .flags          = FLAG_ETHER,
584         .bind           = dm9601_bind,
585         .rx_fixup       = dm9601_rx_fixup,
586         .tx_fixup       = dm9601_tx_fixup,
587         .status         = dm9601_status,
588         .link_reset     = dm9601_link_reset,
589         .reset          = dm9601_link_reset,
590 };
591
592 static const struct usb_device_id products[] = {
593         {
594          USB_DEVICE(0x07aa, 0x9601),    /* Corega FEther USB-TXC */
595          .driver_info = (unsigned long)&dm9601_info,
596          },
597         {
598          USB_DEVICE(0x0a46, 0x9601),    /* Davicom USB-100 */
599          .driver_info = (unsigned long)&dm9601_info,
600          },
601         {
602          USB_DEVICE(0x0a46, 0x6688),    /* ZT6688 USB NIC */
603          .driver_info = (unsigned long)&dm9601_info,
604          },
605         {
606          USB_DEVICE(0x0a46, 0x0268),    /* ShanTou ST268 USB NIC */
607          .driver_info = (unsigned long)&dm9601_info,
608          },
609         {
610          USB_DEVICE(0x0a46, 0x8515),    /* ADMtek ADM8515 USB NIC */
611          .driver_info = (unsigned long)&dm9601_info,
612          },
613         {
614         USB_DEVICE(0x0a47, 0x9601),     /* Hirose USB-100 */
615         .driver_info = (unsigned long)&dm9601_info,
616          },
617         {},                     // END
618 };
619
620 MODULE_DEVICE_TABLE(usb, products);
621
622 static struct usb_driver dm9601_driver = {
623         .name = "dm9601",
624         .id_table = products,
625         .probe = usbnet_probe,
626         .disconnect = usbnet_disconnect,
627         .suspend = usbnet_suspend,
628         .resume = usbnet_resume,
629 };
630
631 static int __init dm9601_init(void)
632 {
633         return usb_register(&dm9601_driver);
634 }
635
636 static void __exit dm9601_exit(void)
637 {
638         usb_deregister(&dm9601_driver);
639 }
640
641 module_init(dm9601_init);
642 module_exit(dm9601_exit);
643
644 MODULE_AUTHOR("Peter Korsgaard <jacmet@sunsite.dk>");
645 MODULE_DESCRIPTION("Davicom DM9601 USB 1.1 ethernet devices");
646 MODULE_LICENSE("GPL");