diff options
Diffstat (limited to 'drivers/usb/net/net1080.c')
| -rw-r--r-- | drivers/usb/net/net1080.c | 622 |
1 files changed, 622 insertions, 0 deletions
diff --git a/drivers/usb/net/net1080.c b/drivers/usb/net/net1080.c new file mode 100644 index 000000000000..a4309c4a491b --- /dev/null +++ b/drivers/usb/net/net1080.c @@ -0,0 +1,622 @@ +/* + * Net1080 based USB host-to-host cables + * Copyright (C) 2000-2005 by David Brownell + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +// #define DEBUG // error path messages, extra info +// #define VERBOSE // more; success messages + +#include <linux/config.h> +#ifdef CONFIG_USB_DEBUG +# define DEBUG +#endif +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/init.h> +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/workqueue.h> +#include <linux/mii.h> +#include <linux/usb.h> + +#include <asm/unaligned.h> + +#include "usbnet.h" + + +/* + * Netchip 1080 driver ... http://www.netchip.com + * (Sept 2004: End-of-life announcement has been sent.) + * Used in (some) LapLink cables + */ + +#define frame_errors data[1] + +/* + * NetChip framing of ethernet packets, supporting additional error + * checks for links that may drop bulk packets from inside messages. + * Odd USB length == always short read for last usb packet. + * - nc_header + * - Ethernet header (14 bytes) + * - payload + * - (optional padding byte, if needed so length becomes odd) + * - nc_trailer + * + * This framing is to be avoided for non-NetChip devices. + */ + +struct nc_header { // packed: + __le16 hdr_len; // sizeof nc_header (LE, all) + __le16 packet_len; // payload size (including ethhdr) + __le16 packet_id; // detects dropped packets +#define MIN_HEADER 6 + + // all else is optional, and must start with: + // __le16 vendorId; // from usb-if + // __le16 productId; +} __attribute__((__packed__)); + +#define PAD_BYTE ((unsigned char)0xAC) + +struct nc_trailer { + __le16 packet_id; +} __attribute__((__packed__)); + +// packets may use FLAG_FRAMING_NC and optional pad +#define FRAMED_SIZE(mtu) (sizeof (struct nc_header) \ + + sizeof (struct ethhdr) \ + + (mtu) \ + + 1 \ + + sizeof (struct nc_trailer)) + +#define MIN_FRAMED FRAMED_SIZE(0) + +/* packets _could_ be up to 64KB... */ +#define NC_MAX_PACKET 32767 + + +/* + * Zero means no timeout; else, how long a 64 byte bulk packet may be queued + * before the hardware drops it. If that's done, the driver will need to + * frame network packets to guard against the dropped USB packets. The win32 + * driver sets this for both sides of the link. + */ +#define NC_READ_TTL_MS ((u8)255) // ms + +/* + * We ignore most registers and EEPROM contents. + */ +#define REG_USBCTL ((u8)0x04) +#define REG_TTL ((u8)0x10) +#define REG_STATUS ((u8)0x11) + +/* + * Vendor specific requests to read/write data + */ +#define REQUEST_REGISTER ((u8)0x10) +#define REQUEST_EEPROM ((u8)0x11) + +static int +nc_vendor_read(struct usbnet *dev, u8 req, u8 regnum, u16 *retval_ptr) +{ + int status = usb_control_msg(dev->udev, + usb_rcvctrlpipe(dev->udev, 0), + req, + USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + 0, regnum, + retval_ptr, sizeof *retval_ptr, + USB_CTRL_GET_TIMEOUT); + if (status > 0) + status = 0; + if (!status) + le16_to_cpus(retval_ptr); + return status; +} + +static inline int +nc_register_read(struct usbnet *dev, u8 regnum, u16 *retval_ptr) +{ + return nc_vendor_read(dev, REQUEST_REGISTER, regnum, retval_ptr); +} + +// no retval ... can become async, usable in_interrupt() +static void +nc_vendor_write(struct usbnet *dev, u8 req, u8 regnum, u16 value) +{ + usb_control_msg(dev->udev, + usb_sndctrlpipe(dev->udev, 0), + req, + USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + value, regnum, + NULL, 0, // data is in setup packet + USB_CTRL_SET_TIMEOUT); +} + +static inline void +nc_register_write(struct usbnet *dev, u8 regnum, u16 value) +{ + nc_vendor_write(dev, REQUEST_REGISTER, regnum, value); +} + + +#if 0 +static void nc_dump_registers(struct usbnet *dev) +{ + u8 reg; + u16 *vp = kmalloc(sizeof (u16)); + + if (!vp) { + dbg("no memory?"); + return; + } + + dbg("%s registers:", dev->net->name); + for (reg = 0; reg < 0x20; reg++) { + int retval; + + // reading some registers is trouble + if (reg >= 0x08 && reg <= 0xf) + continue; + if (reg >= 0x12 && reg <= 0x1e) + continue; + + retval = nc_register_read(dev, reg, vp); + if (retval < 0) + dbg("%s reg [0x%x] ==> error %d", + dev->net->name, reg, retval); + else + dbg("%s reg [0x%x] = 0x%x", + dev->net->name, reg, *vp); + } + kfree(vp); +} +#endif + + +/*-------------------------------------------------------------------------*/ + +/* + * Control register + */ + +#define USBCTL_WRITABLE_MASK 0x1f0f +// bits 15-13 reserved, r/o +#define USBCTL_ENABLE_LANG (1 << 12) +#define USBCTL_ENABLE_MFGR (1 << 11) +#define USBCTL_ENABLE_PROD (1 << 10) +#define USBCTL_ENABLE_SERIAL (1 << 9) +#define USBCTL_ENABLE_DEFAULTS (1 << 8) +// bits 7-4 reserved, r/o +#define USBCTL_FLUSH_OTHER (1 << 3) +#define USBCTL_FLUSH_THIS (1 << 2) +#define USBCTL_DISCONN_OTHER (1 << 1) +#define USBCTL_DISCONN_THIS (1 << 0) + +static inline void nc_dump_usbctl(struct usbnet *dev, u16 usbctl) +{ + if (!netif_msg_link(dev)) + return; + devdbg(dev, "net1080 %s-%s usbctl 0x%x:%s%s%s%s%s;" + " this%s%s;" + " other%s%s; r/o 0x%x", + dev->udev->bus->bus_name, dev->udev->devpath, + usbctl, + (usbctl & USBCTL_ENABLE_LANG) ? " lang" : "", + (usbctl & USBCTL_ENABLE_MFGR) ? " mfgr" : "", + (usbctl & USBCTL_ENABLE_PROD) ? " prod" : "", + (usbctl & USBCTL_ENABLE_SERIAL) ? " serial" : "", + (usbctl & USBCTL_ENABLE_DEFAULTS) ? " defaults" : "", + + (usbctl & USBCTL_FLUSH_OTHER) ? " FLUSH" : "", + (usbctl & USBCTL_DISCONN_OTHER) ? " DIS" : "", + (usbctl & USBCTL_FLUSH_THIS) ? " FLUSH" : "", + (usbctl & USBCTL_DISCONN_THIS) ? " DIS" : "", + usbctl & ~USBCTL_WRITABLE_MASK + ); +} + +/*-------------------------------------------------------------------------*/ + +/* + * Status register + */ + +#define STATUS_PORT_A (1 << 15) + +#define STATUS_CONN_OTHER (1 << 14) +#define STATUS_SUSPEND_OTHER (1 << 13) +#define STATUS_MAILBOX_OTHER (1 << 12) +#define STATUS_PACKETS_OTHER(n) (((n) >> 8) && 0x03) + +#define STATUS_CONN_THIS (1 << 6) +#define STATUS_SUSPEND_THIS (1 << 5) +#define STATUS_MAILBOX_THIS (1 << 4) +#define STATUS_PACKETS_THIS(n) (((n) >> 0) && 0x03) + +#define STATUS_UNSPEC_MASK 0x0c8c +#define STATUS_NOISE_MASK ((u16)~(0x0303|STATUS_UNSPEC_MASK)) + + +static inline void nc_dump_status(struct usbnet *dev, u16 status) +{ + if (!netif_msg_link(dev)) + return; + devdbg(dev, "net1080 %s-%s status 0x%x:" + " this (%c) PKT=%d%s%s%s;" + " other PKT=%d%s%s%s; unspec 0x%x", + dev->udev->bus->bus_name, dev->udev->devpath, + status, + + // XXX the packet counts don't seem right + // (1 at reset, not 0); maybe UNSPEC too + + (status & STATUS_PORT_A) ? 'A' : 'B', + STATUS_PACKETS_THIS(status), + (status & STATUS_CONN_THIS) ? " CON" : "", + (status & STATUS_SUSPEND_THIS) ? " SUS" : "", + (status & STATUS_MAILBOX_THIS) ? " MBOX" : "", + + STATUS_PACKETS_OTHER(status), + (status & STATUS_CONN_OTHER) ? " CON" : "", + (status & STATUS_SUSPEND_OTHER) ? " SUS" : "", + (status & STATUS_MAILBOX_OTHER) ? " MBOX" : "", + + status & STATUS_UNSPEC_MASK + ); +} + +/*-------------------------------------------------------------------------*/ + +/* + * TTL register + */ + +#define TTL_THIS(ttl) (0x00ff & ttl) +#define TTL_OTHER(ttl) (0x00ff & (ttl >> 8)) +#define MK_TTL(this,other) ((u16)(((other)<<8)|(0x00ff&(this)))) + +static inline void nc_dump_ttl(struct usbnet *dev, u16 ttl) +{ + if (netif_msg_link(dev)) + devdbg(dev, "net1080 %s-%s ttl 0x%x this = %d, other = %d", + dev->udev->bus->bus_name, dev->udev->devpath, + ttl, TTL_THIS(ttl), TTL_OTHER(ttl)); +} + +/*-------------------------------------------------------------------------*/ + +static int net1080_reset(struct usbnet *dev) +{ + u16 usbctl, status, ttl; + u16 *vp = kmalloc(sizeof (u16), GFP_KERNEL); + int retval; + + if (!vp) + return -ENOMEM; + + // nc_dump_registers(dev); + + if ((retval = nc_register_read(dev, REG_STATUS, vp)) < 0) { + dbg("can't read %s-%s status: %d", + dev->udev->bus->bus_name, dev->udev->devpath, retval); + goto done; + } + status = *vp; + nc_dump_status(dev, status); + + if ((retval = nc_register_read(dev, REG_USBCTL, vp)) < 0) { + dbg("can't read USBCTL, %d", retval); + goto done; + } + usbctl = *vp; + nc_dump_usbctl(dev, usbctl); + + nc_register_write(dev, REG_USBCTL, + USBCTL_FLUSH_THIS | USBCTL_FLUSH_OTHER); + + if ((retval = nc_register_read(dev, REG_TTL, vp)) < 0) { + dbg("can't read TTL, %d", retval); + goto done; + } + ttl = *vp; + // nc_dump_ttl(dev, ttl); + + nc_register_write(dev, REG_TTL, + MK_TTL(NC_READ_TTL_MS, TTL_OTHER(ttl)) ); + dbg("%s: assigned TTL, %d ms", dev->net->name, NC_READ_TTL_MS); + + if (netif_msg_link(dev)) + devinfo(dev, "port %c, peer %sconnected", + (status & STATUS_PORT_A) ? 'A' : 'B', + (status & STATUS_CONN_OTHER) ? "" : "dis" + ); + retval = 0; + +done: + kfree(vp); + return retval; +} + +static int net1080_check_connect(struct usbnet *dev) +{ + int retval; + u16 status; + u16 *vp = kmalloc(sizeof (u16), GFP_KERNEL); + + if (!vp) + return -ENOMEM; + retval = nc_register_read(dev, REG_STATUS, vp); + status = *vp; + kfree(vp); + if (retval != 0) { + dbg("%s net1080_check_conn read - %d", dev->net->name, retval); + return retval; + } + if ((status & STATUS_CONN_OTHER) != STATUS_CONN_OTHER) + return -ENOLINK; + return 0; +} + +static void nc_flush_complete(struct urb *urb, struct pt_regs *regs) +{ + kfree(urb->context); + usb_free_urb(urb); +} + +static void nc_ensure_sync(struct usbnet *dev) +{ + dev->frame_errors++; + if (dev->frame_errors > 5) { + struct urb *urb; + struct usb_ctrlrequest *req; + int status; + + /* Send a flush */ + urb = usb_alloc_urb(0, SLAB_ATOMIC); + if (!urb) + return; + + req = kmalloc(sizeof *req, GFP_ATOMIC); + if (!req) { + usb_free_urb(urb); + return; + } + + req->bRequestType = USB_DIR_OUT + | USB_TYPE_VENDOR + | USB_RECIP_DEVICE; + req->bRequest = REQUEST_REGISTER; + req->wValue = cpu_to_le16(USBCTL_FLUSH_THIS + | USBCTL_FLUSH_OTHER); + req->wIndex = cpu_to_le16(REG_USBCTL); + req->wLength = cpu_to_le16(0); + + /* queue an async control request, we don't need + * to do anything when it finishes except clean up. + */ + usb_fill_control_urb(urb, dev->udev, + usb_sndctrlpipe(dev->udev, 0), + (unsigned char *) req, + NULL, 0, + nc_flush_complete, req); + status = usb_submit_urb(urb, GFP_ATOMIC); + if (status) { + kfree(req); + usb_free_urb(urb); + return; + } + + if (netif_msg_rx_err(dev)) + devdbg(dev, "flush net1080; too many framing errors"); + dev->frame_errors = 0; + } +} + +static int net1080_rx_fixup(struct usbnet *dev, struct sk_buff *skb) +{ + struct nc_header *header; + struct nc_trailer *trailer; + u16 hdr_len, packet_len; + + if (!(skb->len & 0x01)) { +#ifdef DEBUG + struct net_device *net = dev->net; + dbg("rx framesize %d range %d..%d mtu %d", skb->len, + net->hard_header_len, dev->hard_mtu, net->mtu); +#endif + dev->stats.rx_frame_errors++; + nc_ensure_sync(dev); + return 0; + } + + header = (struct nc_header *) skb->data; + hdr_len = le16_to_cpup(&header->hdr_len); + packet_len = le16_to_cpup(&header->packet_len); + if (FRAMED_SIZE(packet_len) > NC_MAX_PACKET) { + dev->stats.rx_frame_errors++; + dbg("packet too big, %d", packet_len); + nc_ensure_sync(dev); + return 0; + } else if (hdr_len < MIN_HEADER) { + dev->stats.rx_frame_errors++; + dbg("header too short, %d", hdr_len); + nc_ensure_sync(dev); + return 0; + } else if (hdr_len > MIN_HEADER) { + // out of band data for us? + dbg("header OOB, %d bytes", hdr_len - MIN_HEADER); + nc_ensure_sync(dev); + // switch (vendor/product ids) { ... } + } + skb_pull(skb, hdr_len); + + trailer = (struct nc_trailer *) + (skb->data + skb->len - sizeof *trailer); + skb_trim(skb, skb->len - sizeof *trailer); + + if ((packet_len & 0x01) == 0) { + if (skb->data [packet_len] != PAD_BYTE) { + dev->stats.rx_frame_errors++; + dbg("bad pad"); + return 0; + } + skb_trim(skb, skb->len - 1); + } + if (skb->len != packet_len) { + dev->stats.rx_frame_errors++; + dbg("bad packet len %d (expected %d)", + skb->len, packet_len); + nc_ensure_sync(dev); + return 0; + } + if (header->packet_id != get_unaligned(&trailer->packet_id)) { + dev->stats.rx_fifo_errors++; + dbg("(2+ dropped) rx packet_id mismatch 0x%x 0x%x", + le16_to_cpu(header->packet_id), + le16_to_cpu(trailer->packet_id)); + return 0; + } +#if 0 + devdbg(dev, "frame <rx h %d p %d id %d", header->hdr_len, + header->packet_len, header->packet_id); +#endif + dev->frame_errors = 0; + return 1; +} + +static struct sk_buff * +net1080_tx_fixup(struct usbnet *dev, struct sk_buff *skb, unsigned flags) +{ + int padlen; + struct sk_buff *skb2; + struct nc_header *header = NULL; + struct nc_trailer *trailer = NULL; + int len = skb->len; + + padlen = ((len + sizeof (struct nc_header) + + sizeof (struct nc_trailer)) & 0x01) ? 0 : 1; + if (!skb_cloned(skb)) { + int headroom = skb_headroom(skb); + int tailroom = skb_tailroom(skb); + + if ((padlen + sizeof (struct nc_trailer)) <= tailroom + && sizeof (struct nc_header) <= headroom) + /* There's enough head and tail room */ + goto encapsulate; + + if ((sizeof (struct nc_header) + padlen + + sizeof (struct nc_trailer)) < + (headroom + tailroom)) { + /* There's enough total room, so just readjust */ + skb->data = memmove(skb->head + + sizeof (struct nc_header), + skb->data, skb->len); + skb->tail = skb->data + len; + goto encapsulate; + } + } + + /* Create a new skb to use with the correct size */ + skb2 = skb_copy_expand(skb, + sizeof (struct nc_header), + sizeof (struct nc_trailer) + padlen, + flags); + dev_kfree_skb_any(skb); + if (!skb2) + return skb2; + skb = skb2; + +encapsulate: + /* header first */ + header = (struct nc_header *) skb_push(skb, sizeof *header); + header->hdr_len = cpu_to_le16(sizeof (*header)); + header->packet_len = cpu_to_le16(len); + header->packet_id = cpu_to_le16((u16)dev->xid++); + + /* maybe pad; then trailer */ + if (!((skb->len + sizeof *trailer) & 0x01)) + *skb_put(skb, 1) = PAD_BYTE; + trailer = (struct nc_trailer *) skb_put(skb, sizeof *trailer); + put_unaligned(header->packet_id, &trailer->packet_id); +#if 0 + devdbg(dev, "frame >tx h %d p %d id %d", + header->hdr_len, header->packet_len, + header->packet_id); +#endif + return skb; +} + +static int net1080_bind(struct usbnet *dev, struct usb_interface *intf) +{ + unsigned extra = sizeof (struct nc_header) + + 1 + + sizeof (struct nc_trailer); + + dev->net->hard_header_len += extra; + dev->rx_urb_size = dev->net->hard_header_len + dev->net->mtu; + dev->hard_mtu = NC_MAX_PACKET; + return usbnet_get_endpoints (dev, intf); +} + +static const struct driver_info net1080_info = { + .description = "NetChip TurboCONNECT", + .flags = FLAG_FRAMING_NC, + .bind = net1080_bind, + .reset = net1080_reset, + .check_connect = net1080_check_connect, + .rx_fixup = net1080_rx_fixup, + .tx_fixup = net1080_tx_fixup, +}; + +static const struct usb_device_id products [] = { +{ + USB_DEVICE(0x0525, 0x1080), // NetChip ref design + .driver_info = (unsigned long) &net1080_info, +}, { + USB_DEVICE(0x06D0, 0x0622), // Laplink Gold + .driver_info = (unsigned long) &net1080_info, +}, + { }, // END +}; +MODULE_DEVICE_TABLE(usb, products); + +static struct usb_driver net1080_driver = { + .owner = THIS_MODULE, + .name = "net1080", + .id_table = products, + .probe = usbnet_probe, + .disconnect = usbnet_disconnect, + .suspend = usbnet_suspend, + .resume = usbnet_resume, +}; + +static int __init net1080_init(void) +{ + return usb_register(&net1080_driver); +} +module_init(net1080_init); + +static void __exit net1080_exit(void) +{ + usb_deregister(&net1080_driver); +} +module_exit(net1080_exit); + +MODULE_AUTHOR("David Brownell"); +MODULE_DESCRIPTION("NetChip 1080 based USB Host-to-Host Links"); +MODULE_LICENSE("GPL"); |