Move USB network drivers to drivers/net/usb.

It is preferable to group drivers by usage (net, scsi, ATA, ...) than
by bus.  When reviewing drivers, the [PCI|USB|PCMCIA|...] maintainer
is probably less qualified on networking issues than a networking
maintainer.  Also, from a practical standpoint, chips often
appear on multiple buses, which is why we do not put drivers into
drivers/pci/net.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 534 insertions, 0 deletions

diff --git a/drivers/net/usb/mcs7830.c b/drivers/net/usb/mcs7830.c
new file mode 100644
index 000000000000..6240b978fe3d
--- /dev/null
+++ b/drivers/net/usb/mcs7830.c
@@ -0,0 +1,534 @@
+/*
+ * MosChips MCS7830 based USB 2.0 Ethernet Devices
+ *
+ * based on usbnet.c, asix.c and the vendor provided mcs7830 driver
+ *
+ * Copyright (C) 2006 Arnd Bergmann <arnd@arndb.de>
+ * Copyright (C) 2003-2005 David Hollis <dhollis@davehollis.com>
+ * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
+ * Copyright (c) 2002-2003 TiVo Inc.
+ *
+ * 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
+ */
+
+#include <linux/crc32.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/init.h>
+#include <linux/mii.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/usb.h>
+
+#include "usbnet.h"
+
+/* requests */
+#define MCS7830_RD_BMREQ	(USB_DIR_IN  | USB_TYPE_VENDOR | \
+				 USB_RECIP_DEVICE)
+#define MCS7830_WR_BMREQ	(USB_DIR_OUT | USB_TYPE_VENDOR | \
+				 USB_RECIP_DEVICE)
+#define MCS7830_RD_BREQ		0x0E
+#define MCS7830_WR_BREQ		0x0D
+
+#define MCS7830_CTRL_TIMEOUT	1000
+#define MCS7830_MAX_MCAST	64
+
+#define MCS7830_VENDOR_ID	0x9710
+#define MCS7830_PRODUCT_ID	0x7830
+
+#define MCS7830_MII_ADVERTISE	(ADVERTISE_PAUSE_CAP | ADVERTISE_100FULL | \
+				 ADVERTISE_100HALF | ADVERTISE_10FULL | \
+				 ADVERTISE_10HALF | ADVERTISE_CSMA)
+
+/* HIF_REG_XX coressponding index value */
+enum {
+	HIF_REG_MULTICAST_HASH			= 0x00,
+	HIF_REG_PACKET_GAP1			= 0x08,
+	HIF_REG_PACKET_GAP2			= 0x09,
+	HIF_REG_PHY_DATA			= 0x0a,
+	HIF_REG_PHY_CMD1			= 0x0c,
+	   HIF_REG_PHY_CMD1_READ		= 0x40,
+	   HIF_REG_PHY_CMD1_WRITE		= 0x20,
+	   HIF_REG_PHY_CMD1_PHYADDR		= 0x01,
+	HIF_REG_PHY_CMD2			= 0x0d,
+	   HIF_REG_PHY_CMD2_PEND_FLAG_BIT	= 0x80,
+	   HIF_REG_PHY_CMD2_READY_FLAG_BIT	= 0x40,
+	HIF_REG_CONFIG				= 0x0e,
+	   HIF_REG_CONFIG_CFG			= 0x80,
+	   HIF_REG_CONFIG_SPEED100		= 0x40,
+	   HIF_REG_CONFIG_FULLDUPLEX_ENABLE	= 0x20,
+	   HIF_REG_CONFIG_RXENABLE		= 0x10,
+	   HIF_REG_CONFIG_TXENABLE		= 0x08,
+	   HIF_REG_CONFIG_SLEEPMODE		= 0x04,
+	   HIF_REG_CONFIG_ALLMULTICAST		= 0x02,
+	   HIF_REG_CONFIG_PROMISCIOUS		= 0x01,
+	HIF_REG_ETHERNET_ADDR			= 0x0f,
+	HIF_REG_22				= 0x15,
+	HIF_REG_PAUSE_THRESHOLD			= 0x16,
+	   HIF_REG_PAUSE_THRESHOLD_DEFAULT	= 0,
+};
+
+struct mcs7830_data {
+	u8 multi_filter[8];
+	u8 config;
+};
+
+static const char driver_name[] = "MOSCHIP usb-ethernet driver";
+
+static int mcs7830_get_reg(struct usbnet *dev, u16 index, u16 size, void *data)
+{
+	struct usb_device *xdev = dev->udev;
+	int ret;
+
+	ret = usb_control_msg(xdev, usb_rcvctrlpipe(xdev, 0), MCS7830_RD_BREQ,
+			      MCS7830_RD_BMREQ, 0x0000, index, data,
+			      size, msecs_to_jiffies(MCS7830_CTRL_TIMEOUT));
+	return ret;
+}
+
+static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, void *data)
+{
+	struct usb_device *xdev = dev->udev;
+	int ret;
+
+	ret = usb_control_msg(xdev, usb_sndctrlpipe(xdev, 0), MCS7830_WR_BREQ,
+			      MCS7830_WR_BMREQ, 0x0000, index, data,
+			      size, msecs_to_jiffies(MCS7830_CTRL_TIMEOUT));
+	return ret;
+}
+
+static void mcs7830_async_cmd_callback(struct urb *urb)
+{
+	struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;
+
+	if (urb->status < 0)
+		printk(KERN_DEBUG "mcs7830_async_cmd_callback() failed with %d",
+			urb->status);
+
+	kfree(req);
+	usb_free_urb(urb);
+}
+
+static void mcs7830_set_reg_async(struct usbnet *dev, u16 index, u16 size, void *data)
+{
+	struct usb_ctrlrequest *req;
+	int ret;
+	struct urb *urb;
+
+	urb = usb_alloc_urb(0, GFP_ATOMIC);
+	if (!urb) {
+		dev_dbg(&dev->udev->dev, "Error allocating URB "
+				"in write_cmd_async!");
+		return;
+	}
+
+	req = kmalloc(sizeof *req, GFP_ATOMIC);
+	if (!req) {
+		dev_err(&dev->udev->dev, "Failed to allocate memory for "
+				"control request");
+		goto out;
+	}
+	req->bRequestType = MCS7830_WR_BMREQ;
+	req->bRequest = MCS7830_WR_BREQ;
+	req->wValue = 0;
+	req->wIndex = cpu_to_le16(index);
+	req->wLength = cpu_to_le16(size);
+
+	usb_fill_control_urb(urb, dev->udev,
+			     usb_sndctrlpipe(dev->udev, 0),
+			     (void *)req, data, size,
+			     mcs7830_async_cmd_callback, req);
+
+	ret = usb_submit_urb(urb, GFP_ATOMIC);
+	if (ret < 0) {
+		dev_err(&dev->udev->dev, "Error submitting the control "
+				"message: ret=%d", ret);
+		goto out;
+	}
+	return;
+out:
+	kfree(req);
+	usb_free_urb(urb);
+}
+
+static int mcs7830_get_address(struct usbnet *dev)
+{
+	int ret;
+	ret = mcs7830_get_reg(dev, HIF_REG_ETHERNET_ADDR, ETH_ALEN,
+				   dev->net->dev_addr);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
+static int mcs7830_read_phy(struct usbnet *dev, u8 index)
+{
+	int ret;
+	int i;
+	__le16 val;
+
+	u8 cmd[2] = {
+		HIF_REG_PHY_CMD1_READ | HIF_REG_PHY_CMD1_PHYADDR,
+		HIF_REG_PHY_CMD2_PEND_FLAG_BIT | index,
+	};
+
+	mutex_lock(&dev->phy_mutex);
+	/* write the MII command */
+	ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
+	if (ret < 0)
+		goto out;
+
+	/* wait for the data to become valid, should be within < 1ms */
+	for (i = 0; i < 10; i++) {
+		ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
+		if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
+			break;
+		ret = -EIO;
+		msleep(1);
+	}
+	if (ret < 0)
+		goto out;
+
+	/* read actual register contents */
+	ret = mcs7830_get_reg(dev, HIF_REG_PHY_DATA, 2, &val);
+	if (ret < 0)
+		goto out;
+	ret = le16_to_cpu(val);
+	dev_dbg(&dev->udev->dev, "read PHY reg %02x: %04x (%d tries)\n",
+		index, val, i);
+out:
+	mutex_unlock(&dev->phy_mutex);
+	return ret;
+}
+
+static int mcs7830_write_phy(struct usbnet *dev, u8 index, u16 val)
+{
+	int ret;
+	int i;
+	__le16 le_val;
+
+	u8 cmd[2] = {
+		HIF_REG_PHY_CMD1_WRITE | HIF_REG_PHY_CMD1_PHYADDR,
+		HIF_REG_PHY_CMD2_PEND_FLAG_BIT | (index & 0x1F),
+	};
+
+	mutex_lock(&dev->phy_mutex);
+
+	/* write the new register contents */
+	le_val = cpu_to_le16(val);
+	ret = mcs7830_set_reg(dev, HIF_REG_PHY_DATA, 2, &le_val);
+	if (ret < 0)
+		goto out;
+
+	/* write the MII command */
+	ret = mcs7830_set_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
+	if (ret < 0)
+		goto out;
+
+	/* wait for the command to be accepted by the PHY */
+	for (i = 0; i < 10; i++) {
+		ret = mcs7830_get_reg(dev, HIF_REG_PHY_CMD1, 2, cmd);
+		if ((ret < 0) || (cmd[1] & HIF_REG_PHY_CMD2_READY_FLAG_BIT))
+			break;
+		ret = -EIO;
+		msleep(1);
+	}
+	if (ret < 0)
+		goto out;
+
+	ret = 0;
+	dev_dbg(&dev->udev->dev, "write PHY reg %02x: %04x (%d tries)\n",
+		index, val, i);
+out:
+	mutex_unlock(&dev->phy_mutex);
+	return ret;
+}
+
+/*
+ * This algorithm comes from the original mcs7830 version 1.4 driver,
+ * not sure if it is needed.
+ */
+static int mcs7830_set_autoneg(struct usbnet *dev, int ptrUserPhyMode)
+{
+	int ret;
+	/* Enable all media types */
+	ret = mcs7830_write_phy(dev, MII_ADVERTISE, MCS7830_MII_ADVERTISE);
+
+	/* First reset BMCR */
+	if (!ret)
+		ret = mcs7830_write_phy(dev, MII_BMCR, 0x0000);
+	/* Enable Auto Neg */
+	if (!ret)
+		ret = mcs7830_write_phy(dev, MII_BMCR, BMCR_ANENABLE);
+	/* Restart Auto Neg (Keep the Enable Auto Neg Bit Set) */
+	if (!ret)
+		ret = mcs7830_write_phy(dev, MII_BMCR,
+				BMCR_ANENABLE | BMCR_ANRESTART	);
+	return ret < 0 ? : 0;
+}
+
+
+/*
+ * if we can read register 22, the chip revision is C or higher
+ */
+static int mcs7830_get_rev(struct usbnet *dev)
+{
+	u8 dummy[2];
+	int ret;
+	ret = mcs7830_get_reg(dev, HIF_REG_22, 2, dummy);
+	if (ret > 0)
+		return 2; /* Rev C or later */
+	return 1; /* earlier revision */
+}
+
+/*
+ * On rev. C we need to set the pause threshold
+ */
+static void mcs7830_rev_C_fixup(struct usbnet *dev)
+{
+	u8 pause_threshold = HIF_REG_PAUSE_THRESHOLD_DEFAULT;
+	int retry;
+
+	for (retry = 0; retry < 2; retry++) {
+		if (mcs7830_get_rev(dev) == 2) {
+			dev_info(&dev->udev->dev, "applying rev.C fixup\n");
+			mcs7830_set_reg(dev, HIF_REG_PAUSE_THRESHOLD,
+					1, &pause_threshold);
+		}
+		msleep(1);
+	}
+}
+
+static int mcs7830_init_dev(struct usbnet *dev)
+{
+	int ret;
+	int retry;
+
+	/* Read MAC address from EEPROM */
+	ret = -EINVAL;
+	for (retry = 0; retry < 5 && ret; retry++)
+		ret = mcs7830_get_address(dev);
+	if (ret) {
+		dev_warn(&dev->udev->dev, "Cannot read MAC address\n");
+		goto out;
+	}
+
+	/* Set up PHY */
+	ret = mcs7830_set_autoneg(dev, 0);
+	if (ret) {
+		dev_info(&dev->udev->dev, "Cannot set autoneg\n");
+		goto out;
+	}
+
+	mcs7830_rev_C_fixup(dev);
+	ret = 0;
+out:
+	return ret;
+}
+
+static int mcs7830_mdio_read(struct net_device *netdev, int phy_id,
+			     int location)
+{
+	struct usbnet *dev = netdev->priv;
+	return mcs7830_read_phy(dev, location);
+}
+
+static void mcs7830_mdio_write(struct net_device *netdev, int phy_id,
+				int location, int val)
+{
+	struct usbnet *dev = netdev->priv;
+	mcs7830_write_phy(dev, location, val);
+}
+
+static int mcs7830_ioctl(struct net_device *net, struct ifreq *rq, int cmd)
+{
+	struct usbnet *dev = netdev_priv(net);
+	return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
+}
+
+/* credits go to asix_set_multicast */
+static void mcs7830_set_multicast(struct net_device *net)
+{
+	struct usbnet *dev = netdev_priv(net);
+	struct mcs7830_data *data = (struct mcs7830_data *)&dev->data;
+
+	data->config = HIF_REG_CONFIG_TXENABLE;
+
+	/* this should not be needed, but it doesn't work otherwise */
+	data->config |= HIF_REG_CONFIG_ALLMULTICAST;
+
+	if (net->flags & IFF_PROMISC) {
+		data->config |= HIF_REG_CONFIG_PROMISCIOUS;
+	} else if (net->flags & IFF_ALLMULTI
+		   || net->mc_count > MCS7830_MAX_MCAST) {
+		data->config |= HIF_REG_CONFIG_ALLMULTICAST;
+	} else if (net->mc_count == 0) {
+		/* just broadcast and directed */
+	} else {
+		/* We use the 20 byte dev->data
+		 * for our 8 byte filter buffer
+		 * to avoid allocating memory that
+		 * is tricky to free later */
+		struct dev_mc_list *mc_list = net->mc_list;
+		u32 crc_bits;
+		int i;
+
+		memset(data->multi_filter, 0, sizeof data->multi_filter);
+
+		/* Build the multicast hash filter. */
+		for (i = 0; i < net->mc_count; i++) {
+			crc_bits = ether_crc(ETH_ALEN, mc_list->dmi_addr) >> 26;
+			data->multi_filter[crc_bits >> 3] |= 1 << (crc_bits & 7);
+			mc_list = mc_list->next;
+		}
+
+		mcs7830_set_reg_async(dev, HIF_REG_MULTICAST_HASH,
+				sizeof data->multi_filter,
+				data->multi_filter);
+	}
+
+	mcs7830_set_reg_async(dev, HIF_REG_CONFIG, 1, &data->config);
+}
+
+static int mcs7830_get_regs_len(struct net_device *net)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	switch (mcs7830_get_rev(dev)) {
+	case 1:
+		return 21;
+	case 2:
+		return 32;
+	}
+	return 0;
+}
+
+static void mcs7830_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *drvinfo)
+{
+	usbnet_get_drvinfo(net, drvinfo);
+	drvinfo->regdump_len = mcs7830_get_regs_len(net);
+}
+
+static void mcs7830_get_regs(struct net_device *net, struct ethtool_regs *regs, void *data)
+{
+	struct usbnet *dev = netdev_priv(net);
+
+	regs->version = mcs7830_get_rev(dev);
+	mcs7830_get_reg(dev, 0, regs->len, data);
+}
+
+static struct ethtool_ops mcs7830_ethtool_ops = {
+	.get_drvinfo		= mcs7830_get_drvinfo,
+	.get_regs_len		= mcs7830_get_regs_len,
+	.get_regs		= mcs7830_get_regs,
+
+	/* common usbnet calls */
+	.get_link		= usbnet_get_link,
+	.get_msglevel		= usbnet_get_msglevel,
+	.set_msglevel		= usbnet_set_msglevel,
+	.get_settings		= usbnet_get_settings,
+	.set_settings		= usbnet_set_settings,
+	.nway_reset		= usbnet_nway_reset,
+};
+
+static int mcs7830_bind(struct usbnet *dev, struct usb_interface *udev)
+{
+	struct net_device *net = dev->net;
+	int ret;
+
+	ret = mcs7830_init_dev(dev);
+	if (ret)
+		goto out;
+
+	net->do_ioctl = mcs7830_ioctl;
+	net->ethtool_ops = &mcs7830_ethtool_ops;
+	net->set_multicast_list = mcs7830_set_multicast;
+	mcs7830_set_multicast(net);
+
+	/* reserve space for the status byte on rx */
+	dev->rx_urb_size = ETH_FRAME_LEN + 1;
+
+	dev->mii.mdio_read = mcs7830_mdio_read;
+	dev->mii.mdio_write = mcs7830_mdio_write;
+	dev->mii.dev = net;
+	dev->mii.phy_id_mask = 0x3f;
+	dev->mii.reg_num_mask = 0x1f;
+	dev->mii.phy_id = *((u8 *) net->dev_addr + 1);
+
+	ret = usbnet_get_endpoints(dev, udev);
+out:
+	return ret;
+}
+
+/* The chip always appends a status bytes that we need to strip */
+static int mcs7830_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
+{
+	u8 status;
+
+	if (skb->len == 0) {
+		dev_err(&dev->udev->dev, "unexpected empty rx frame\n");
+		return 0;
+	}
+
+	skb_trim(skb, skb->len - 1);
+	status = skb->data[skb->len];
+
+	if (status != 0x20)
+		dev_dbg(&dev->udev->dev, "rx fixup status %x\n", status);
+
+	return skb->len > 0;
+}
+
+static const struct driver_info moschip_info = {
+	.description	= "MOSCHIP 7830 usb-NET adapter",
+	.bind		= mcs7830_bind,
+	.rx_fixup	= mcs7830_rx_fixup,
+	.flags		= FLAG_ETHER,
+	.in		= 1,
+	.out		= 2,
+};
+
+static const struct usb_device_id products[] = {
+	{
+		USB_DEVICE(MCS7830_VENDOR_ID, MCS7830_PRODUCT_ID),
+		.driver_info = (unsigned long) &moschip_info,
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(usb, products);
+
+static struct usb_driver mcs7830_driver = {
+	.name = driver_name,
+	.id_table = products,
+	.probe = usbnet_probe,
+	.disconnect = usbnet_disconnect,
+	.suspend = usbnet_suspend,
+	.resume = usbnet_resume,
+};
+
+static int __init mcs7830_init(void)
+{
+	return usb_register(&mcs7830_driver);
+}
+module_init(mcs7830_init);
+
+static void __exit mcs7830_exit(void)
+{
+	usb_deregister(&mcs7830_driver);
+}
+module_exit(mcs7830_exit);
+
+MODULE_DESCRIPTION("USB to network adapter MCS7830)");
+MODULE_LICENSE("GPL");