2 * Net1080 based USB host-to-host cables
3 * Copyright (C) 2000-2005 by David Brownell
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 // #define DEBUG // error path messages, extra info
21 // #define VERBOSE // more; success messages
23 #include <linux/module.h>
24 #include <linux/sched.h>
25 #include <linux/init.h>
26 #include <linux/netdevice.h>
27 #include <linux/etherdevice.h>
28 #include <linux/ethtool.h>
29 #include <linux/workqueue.h>
30 #include <linux/mii.h>
31 #include <linux/usb.h>
33 #include <asm/unaligned.h>
39 * Netchip 1080 driver ... http://www.netchip.com
40 * (Sept 2004: End-of-life announcement has been sent.)
41 * Used in (some) LapLink cables
44 #define frame_errors data[1]
47 * NetChip framing of ethernet packets, supporting additional error
48 * checks for links that may drop bulk packets from inside messages.
49 * Odd USB length == always short read for last usb packet.
51 * - Ethernet header (14 bytes)
53 * - (optional padding byte, if needed so length becomes odd)
56 * This framing is to be avoided for non-NetChip devices.
59 struct nc_header { // packed:
60 __le16 hdr_len; // sizeof nc_header (LE, all)
61 __le16 packet_len; // payload size (including ethhdr)
62 __le16 packet_id; // detects dropped packets
65 // all else is optional, and must start with:
66 // __le16 vendorId; // from usb-if
68 } __attribute__((__packed__));
70 #define PAD_BYTE ((unsigned char)0xAC)
74 } __attribute__((__packed__));
76 // packets may use FLAG_FRAMING_NC and optional pad
77 #define FRAMED_SIZE(mtu) (sizeof (struct nc_header) \
78 + sizeof (struct ethhdr) \
81 + sizeof (struct nc_trailer))
83 #define MIN_FRAMED FRAMED_SIZE(0)
85 /* packets _could_ be up to 64KB... */
86 #define NC_MAX_PACKET 32767
90 * Zero means no timeout; else, how long a 64 byte bulk packet may be queued
91 * before the hardware drops it. If that's done, the driver will need to
92 * frame network packets to guard against the dropped USB packets. The win32
93 * driver sets this for both sides of the link.
95 #define NC_READ_TTL_MS ((u8)255) // ms
98 * We ignore most registers and EEPROM contents.
100 #define REG_USBCTL ((u8)0x04)
101 #define REG_TTL ((u8)0x10)
102 #define REG_STATUS ((u8)0x11)
105 * Vendor specific requests to read/write data
107 #define REQUEST_REGISTER ((u8)0x10)
108 #define REQUEST_EEPROM ((u8)0x11)
111 nc_vendor_read(struct usbnet *dev, u8 req, u8 regnum, u16 *retval_ptr)
113 int status = usb_control_msg(dev->udev,
114 usb_rcvctrlpipe(dev->udev, 0),
116 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
118 retval_ptr, sizeof *retval_ptr,
119 USB_CTRL_GET_TIMEOUT);
123 le16_to_cpus(retval_ptr);
128 nc_register_read(struct usbnet *dev, u8 regnum, u16 *retval_ptr)
130 return nc_vendor_read(dev, REQUEST_REGISTER, regnum, retval_ptr);
133 // no retval ... can become async, usable in_interrupt()
135 nc_vendor_write(struct usbnet *dev, u8 req, u8 regnum, u16 value)
137 usb_control_msg(dev->udev,
138 usb_sndctrlpipe(dev->udev, 0),
140 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
142 NULL, 0, // data is in setup packet
143 USB_CTRL_SET_TIMEOUT);
147 nc_register_write(struct usbnet *dev, u8 regnum, u16 value)
149 nc_vendor_write(dev, REQUEST_REGISTER, regnum, value);
154 static void nc_dump_registers(struct usbnet *dev)
157 u16 *vp = kmalloc(sizeof (u16));
164 dbg("%s registers:", dev->net->name);
165 for (reg = 0; reg < 0x20; reg++) {
168 // reading some registers is trouble
169 if (reg >= 0x08 && reg <= 0xf)
171 if (reg >= 0x12 && reg <= 0x1e)
174 retval = nc_register_read(dev, reg, vp);
176 dbg("%s reg [0x%x] ==> error %d",
177 dev->net->name, reg, retval);
179 dbg("%s reg [0x%x] = 0x%x",
180 dev->net->name, reg, *vp);
187 /*-------------------------------------------------------------------------*/
193 #define USBCTL_WRITABLE_MASK 0x1f0f
194 // bits 15-13 reserved, r/o
195 #define USBCTL_ENABLE_LANG (1 << 12)
196 #define USBCTL_ENABLE_MFGR (1 << 11)
197 #define USBCTL_ENABLE_PROD (1 << 10)
198 #define USBCTL_ENABLE_SERIAL (1 << 9)
199 #define USBCTL_ENABLE_DEFAULTS (1 << 8)
200 // bits 7-4 reserved, r/o
201 #define USBCTL_FLUSH_OTHER (1 << 3)
202 #define USBCTL_FLUSH_THIS (1 << 2)
203 #define USBCTL_DISCONN_OTHER (1 << 1)
204 #define USBCTL_DISCONN_THIS (1 << 0)
206 static inline void nc_dump_usbctl(struct usbnet *dev, u16 usbctl)
208 if (!netif_msg_link(dev))
210 devdbg(dev, "net1080 %s-%s usbctl 0x%x:%s%s%s%s%s;"
212 " other%s%s; r/o 0x%x",
213 dev->udev->bus->bus_name, dev->udev->devpath,
215 (usbctl & USBCTL_ENABLE_LANG) ? " lang" : "",
216 (usbctl & USBCTL_ENABLE_MFGR) ? " mfgr" : "",
217 (usbctl & USBCTL_ENABLE_PROD) ? " prod" : "",
218 (usbctl & USBCTL_ENABLE_SERIAL) ? " serial" : "",
219 (usbctl & USBCTL_ENABLE_DEFAULTS) ? " defaults" : "",
221 (usbctl & USBCTL_FLUSH_OTHER) ? " FLUSH" : "",
222 (usbctl & USBCTL_DISCONN_OTHER) ? " DIS" : "",
223 (usbctl & USBCTL_FLUSH_THIS) ? " FLUSH" : "",
224 (usbctl & USBCTL_DISCONN_THIS) ? " DIS" : "",
225 usbctl & ~USBCTL_WRITABLE_MASK
229 /*-------------------------------------------------------------------------*/
235 #define STATUS_PORT_A (1 << 15)
237 #define STATUS_CONN_OTHER (1 << 14)
238 #define STATUS_SUSPEND_OTHER (1 << 13)
239 #define STATUS_MAILBOX_OTHER (1 << 12)
240 #define STATUS_PACKETS_OTHER(n) (((n) >> 8) && 0x03)
242 #define STATUS_CONN_THIS (1 << 6)
243 #define STATUS_SUSPEND_THIS (1 << 5)
244 #define STATUS_MAILBOX_THIS (1 << 4)
245 #define STATUS_PACKETS_THIS(n) (((n) >> 0) && 0x03)
247 #define STATUS_UNSPEC_MASK 0x0c8c
248 #define STATUS_NOISE_MASK ((u16)~(0x0303|STATUS_UNSPEC_MASK))
251 static inline void nc_dump_status(struct usbnet *dev, u16 status)
253 if (!netif_msg_link(dev))
255 devdbg(dev, "net1080 %s-%s status 0x%x:"
256 " this (%c) PKT=%d%s%s%s;"
257 " other PKT=%d%s%s%s; unspec 0x%x",
258 dev->udev->bus->bus_name, dev->udev->devpath,
261 // XXX the packet counts don't seem right
262 // (1 at reset, not 0); maybe UNSPEC too
264 (status & STATUS_PORT_A) ? 'A' : 'B',
265 STATUS_PACKETS_THIS(status),
266 (status & STATUS_CONN_THIS) ? " CON" : "",
267 (status & STATUS_SUSPEND_THIS) ? " SUS" : "",
268 (status & STATUS_MAILBOX_THIS) ? " MBOX" : "",
270 STATUS_PACKETS_OTHER(status),
271 (status & STATUS_CONN_OTHER) ? " CON" : "",
272 (status & STATUS_SUSPEND_OTHER) ? " SUS" : "",
273 (status & STATUS_MAILBOX_OTHER) ? " MBOX" : "",
275 status & STATUS_UNSPEC_MASK
279 /*-------------------------------------------------------------------------*/
285 #define TTL_THIS(ttl) (0x00ff & ttl)
286 #define TTL_OTHER(ttl) (0x00ff & (ttl >> 8))
287 #define MK_TTL(this,other) ((u16)(((other)<<8)|(0x00ff&(this))))
289 static inline void nc_dump_ttl(struct usbnet *dev, u16 ttl)
291 if (netif_msg_link(dev))
292 devdbg(dev, "net1080 %s-%s ttl 0x%x this = %d, other = %d",
293 dev->udev->bus->bus_name, dev->udev->devpath,
294 ttl, TTL_THIS(ttl), TTL_OTHER(ttl));
297 /*-------------------------------------------------------------------------*/
299 static int net1080_reset(struct usbnet *dev)
301 u16 usbctl, status, ttl;
302 u16 *vp = kmalloc(sizeof (u16), GFP_KERNEL);
308 // nc_dump_registers(dev);
310 if ((retval = nc_register_read(dev, REG_STATUS, vp)) < 0) {
311 dbg("can't read %s-%s status: %d",
312 dev->udev->bus->bus_name, dev->udev->devpath, retval);
316 nc_dump_status(dev, status);
318 if ((retval = nc_register_read(dev, REG_USBCTL, vp)) < 0) {
319 dbg("can't read USBCTL, %d", retval);
323 nc_dump_usbctl(dev, usbctl);
325 nc_register_write(dev, REG_USBCTL,
326 USBCTL_FLUSH_THIS | USBCTL_FLUSH_OTHER);
328 if ((retval = nc_register_read(dev, REG_TTL, vp)) < 0) {
329 dbg("can't read TTL, %d", retval);
333 // nc_dump_ttl(dev, ttl);
335 nc_register_write(dev, REG_TTL,
336 MK_TTL(NC_READ_TTL_MS, TTL_OTHER(ttl)) );
337 dbg("%s: assigned TTL, %d ms", dev->net->name, NC_READ_TTL_MS);
339 if (netif_msg_link(dev))
340 devinfo(dev, "port %c, peer %sconnected",
341 (status & STATUS_PORT_A) ? 'A' : 'B',
342 (status & STATUS_CONN_OTHER) ? "" : "dis"
351 static int net1080_check_connect(struct usbnet *dev)
355 u16 *vp = kmalloc(sizeof (u16), GFP_KERNEL);
359 retval = nc_register_read(dev, REG_STATUS, vp);
363 dbg("%s net1080_check_conn read - %d", dev->net->name, retval);
366 if ((status & STATUS_CONN_OTHER) != STATUS_CONN_OTHER)
371 static void nc_flush_complete(struct urb *urb, struct pt_regs *regs)
377 static void nc_ensure_sync(struct usbnet *dev)
380 if (dev->frame_errors > 5) {
382 struct usb_ctrlrequest *req;
386 urb = usb_alloc_urb(0, SLAB_ATOMIC);
390 req = kmalloc(sizeof *req, GFP_ATOMIC);
396 req->bRequestType = USB_DIR_OUT
399 req->bRequest = REQUEST_REGISTER;
400 req->wValue = cpu_to_le16(USBCTL_FLUSH_THIS
401 | USBCTL_FLUSH_OTHER);
402 req->wIndex = cpu_to_le16(REG_USBCTL);
403 req->wLength = cpu_to_le16(0);
405 /* queue an async control request, we don't need
406 * to do anything when it finishes except clean up.
408 usb_fill_control_urb(urb, dev->udev,
409 usb_sndctrlpipe(dev->udev, 0),
410 (unsigned char *) req,
412 nc_flush_complete, req);
413 status = usb_submit_urb(urb, GFP_ATOMIC);
420 if (netif_msg_rx_err(dev))
421 devdbg(dev, "flush net1080; too many framing errors");
422 dev->frame_errors = 0;
426 static int net1080_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
428 struct nc_header *header;
429 struct nc_trailer *trailer;
430 u16 hdr_len, packet_len;
432 if (!(skb->len & 0x01)) {
434 struct net_device *net = dev->net;
435 dbg("rx framesize %d range %d..%d mtu %d", skb->len,
436 net->hard_header_len, dev->hard_mtu, net->mtu);
438 dev->stats.rx_frame_errors++;
443 header = (struct nc_header *) skb->data;
444 hdr_len = le16_to_cpup(&header->hdr_len);
445 packet_len = le16_to_cpup(&header->packet_len);
446 if (FRAMED_SIZE(packet_len) > NC_MAX_PACKET) {
447 dev->stats.rx_frame_errors++;
448 dbg("packet too big, %d", packet_len);
451 } else if (hdr_len < MIN_HEADER) {
452 dev->stats.rx_frame_errors++;
453 dbg("header too short, %d", hdr_len);
456 } else if (hdr_len > MIN_HEADER) {
457 // out of band data for us?
458 dbg("header OOB, %d bytes", hdr_len - MIN_HEADER);
460 // switch (vendor/product ids) { ... }
462 skb_pull(skb, hdr_len);
464 trailer = (struct nc_trailer *)
465 (skb->data + skb->len - sizeof *trailer);
466 skb_trim(skb, skb->len - sizeof *trailer);
468 if ((packet_len & 0x01) == 0) {
469 if (skb->data [packet_len] != PAD_BYTE) {
470 dev->stats.rx_frame_errors++;
474 skb_trim(skb, skb->len - 1);
476 if (skb->len != packet_len) {
477 dev->stats.rx_frame_errors++;
478 dbg("bad packet len %d (expected %d)",
479 skb->len, packet_len);
483 if (header->packet_id != get_unaligned(&trailer->packet_id)) {
484 dev->stats.rx_fifo_errors++;
485 dbg("(2+ dropped) rx packet_id mismatch 0x%x 0x%x",
486 le16_to_cpu(header->packet_id),
487 le16_to_cpu(trailer->packet_id));
491 devdbg(dev, "frame <rx h %d p %d id %d", header->hdr_len,
492 header->packet_len, header->packet_id);
494 dev->frame_errors = 0;
498 static struct sk_buff *
499 net1080_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
501 struct sk_buff *skb2;
502 struct nc_header *header = NULL;
503 struct nc_trailer *trailer = NULL;
504 int padlen = sizeof (struct nc_trailer);
507 if (!((len + padlen + sizeof (struct nc_header)) & 0x01))
509 if (!skb_cloned(skb)) {
510 int headroom = skb_headroom(skb);
511 int tailroom = skb_tailroom(skb);
513 if (padlen <= tailroom &&
514 sizeof(struct nc_header) <= headroom)
515 /* There's enough head and tail room */
518 if ((sizeof (struct nc_header) + padlen) <
519 (headroom + tailroom)) {
520 /* There's enough total room, so just readjust */
521 skb->data = memmove(skb->head
522 + sizeof (struct nc_header),
523 skb->data, skb->len);
524 skb->tail = skb->data + len;
529 /* Create a new skb to use with the correct size */
530 skb2 = skb_copy_expand(skb,
531 sizeof (struct nc_header),
534 dev_kfree_skb_any(skb);
541 header = (struct nc_header *) skb_push(skb, sizeof *header);
542 header->hdr_len = cpu_to_le16(sizeof (*header));
543 header->packet_len = cpu_to_le16(len);
544 header->packet_id = cpu_to_le16((u16)dev->xid++);
546 /* maybe pad; then trailer */
547 if (!((skb->len + sizeof *trailer) & 0x01))
548 *skb_put(skb, 1) = PAD_BYTE;
549 trailer = (struct nc_trailer *) skb_put(skb, sizeof *trailer);
550 put_unaligned(header->packet_id, &trailer->packet_id);
552 devdbg(dev, "frame >tx h %d p %d id %d",
553 header->hdr_len, header->packet_len,
559 static int net1080_bind(struct usbnet *dev, struct usb_interface *intf)
561 unsigned extra = sizeof (struct nc_header)
563 + sizeof (struct nc_trailer);
565 dev->net->hard_header_len += extra;
566 dev->rx_urb_size = dev->net->hard_header_len + dev->net->mtu;
567 dev->hard_mtu = NC_MAX_PACKET;
568 return usbnet_get_endpoints (dev, intf);
571 static const struct driver_info net1080_info = {
572 .description = "NetChip TurboCONNECT",
573 .flags = FLAG_FRAMING_NC,
574 .bind = net1080_bind,
575 .reset = net1080_reset,
576 .check_connect = net1080_check_connect,
577 .rx_fixup = net1080_rx_fixup,
578 .tx_fixup = net1080_tx_fixup,
581 static const struct usb_device_id products [] = {
583 USB_DEVICE(0x0525, 0x1080), // NetChip ref design
584 .driver_info = (unsigned long) &net1080_info,
586 USB_DEVICE(0x06D0, 0x0622), // Laplink Gold
587 .driver_info = (unsigned long) &net1080_info,
591 MODULE_DEVICE_TABLE(usb, products);
593 static struct usb_driver net1080_driver = {
595 .id_table = products,
596 .probe = usbnet_probe,
597 .disconnect = usbnet_disconnect,
598 .suspend = usbnet_suspend,
599 .resume = usbnet_resume,
602 static int __init net1080_init(void)
604 return usb_register(&net1080_driver);
606 module_init(net1080_init);
608 static void __exit net1080_exit(void)
610 usb_deregister(&net1080_driver);
612 module_exit(net1080_exit);
614 MODULE_AUTHOR("David Brownell");
615 MODULE_DESCRIPTION("NetChip 1080 based USB Host-to-Host Links");
616 MODULE_LICENSE("GPL");