asix.c

linux-2.6.15.6

/*
 * ASIX AX8817X based USB 2.0 Ethernet Devices
 * Copyright (C) 2003-2005 David Hollis <[e-mail]>
 * Copyright (C) 2005 Phil Chang <[e-mail]>
 * 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
 */

// #define	DEBUG			// error path messages, extra info
// #define	VERBOSE			// more; success messages

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kmod.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 <linux/crc32.h>

#include "usbnet.h"


/* ASIX AX8817X based USB 2.0 Ethernet Devices */

#define AX_CMD_SET_SW_MII		0x06
#define AX_CMD_READ_MII_REG		0x07
#define AX_CMD_WRITE_MII_REG		0x08
#define AX_CMD_SET_HW_MII		0x0a
#define AX_CMD_READ_EEPROM		0x0b
#define AX_CMD_WRITE_EEPROM		0x0c
#define AX_CMD_WRITE_ENABLE		0x0d
#define AX_CMD_WRITE_DISABLE		0x0e
#define AX_CMD_WRITE_RX_CTL		0x10
#define AX_CMD_READ_IPG012		0x11
#define AX_CMD_WRITE_IPG0		0x12
#define AX_CMD_WRITE_IPG1		0x13
#define AX_CMD_WRITE_IPG2		0x14
#define AX_CMD_WRITE_MULTI_FILTER	0x16
#define AX_CMD_READ_NODE_ID		0x17
#define AX_CMD_READ_PHY_ID		0x19
#define AX_CMD_READ_MEDIUM_STATUS	0x1a
#define AX_CMD_WRITE_MEDIUM_MODE	0x1b
#define AX_CMD_READ_MONITOR_MODE	0x1c
#define AX_CMD_WRITE_MONITOR_MODE	0x1d
#define AX_CMD_WRITE_GPIOS		0x1f
#define AX_CMD_SW_RESET			0x20
#define AX_CMD_SW_PHY_STATUS		0x21
#define AX_CMD_SW_PHY_SELECT		0x22
#define AX88772_CMD_READ_NODE_ID	0x13

#define AX_MONITOR_MODE			0x01
#define AX_MONITOR_LINK			0x02
#define AX_MONITOR_MAGIC		0x04
#define AX_MONITOR_HSFS			0x10

/* AX88172 Medium Status Register values */
#define AX_MEDIUM_FULL_DUPLEX		0x02
#define AX_MEDIUM_TX_ABORT_ALLOW	0x04
#define AX_MEDIUM_FLOW_CONTROL_EN	0x10

#define AX_MCAST_FILTER_SIZE		8
#define AX_MAX_MCAST			64

#define AX_EEPROM_LEN			0x40

#define AX_SWRESET_CLEAR		0x00
#define AX_SWRESET_RR			0x01
#define AX_SWRESET_RT			0x02
#define AX_SWRESET_PRTE			0x04
#define AX_SWRESET_PRL			0x08
#define AX_SWRESET_BZ			0x10
#define AX_SWRESET_IPRL			0x20
#define AX_SWRESET_IPPD			0x40

#define AX88772_IPG0_DEFAULT		0x15
#define AX88772_IPG1_DEFAULT		0x0c
#define AX88772_IPG2_DEFAULT		0x12

#define AX88772_MEDIUM_FULL_DUPLEX	0x0002
#define AX88772_MEDIUM_RESERVED		0x0004
#define AX88772_MEDIUM_RX_FC_ENABLE	0x0010
#define AX88772_MEDIUM_TX_FC_ENABLE	0x0020
#define AX88772_MEDIUM_PAUSE_FORMAT	0x0080
#define AX88772_MEDIUM_RX_ENABLE	0x0100
#define AX88772_MEDIUM_100MB		0x0200
#define AX88772_MEDIUM_DEFAULT	\
	(AX88772_MEDIUM_FULL_DUPLEX | AX88772_MEDIUM_RX_FC_ENABLE | \
	 AX88772_MEDIUM_TX_FC_ENABLE | AX88772_MEDIUM_100MB | \
	 AX88772_MEDIUM_RESERVED | AX88772_MEDIUM_RX_ENABLE )

#define AX_EEPROM_MAGIC			0xdeadbeef

/* This structure cannot exceed sizeof(unsigned long [5]) AKA 20 bytes */
struct ax8817x_data {
	u8 multi_filter[AX_MCAST_FILTER_SIZE];
};

struct ax88172_int_data {
	u16 res1;
	u8 link;
	u16 res2;
	u8 status;
	u16 res3;
} __attribute__ ((packed));

static int ax8817x_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
			    u16 size, void *data)
{
	return usb_control_msg(
		dev->udev,
		usb_rcvctrlpipe(dev->udev, 0),
		cmd,
		USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
		value,
		index,
		data,
		size,
		USB_CTRL_GET_TIMEOUT);
}

static int ax8817x_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
			     u16 size, void *data)
{
	return usb_control_msg(
		dev->udev,
		usb_sndctrlpipe(dev->udev, 0),
		cmd,
		USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
		value,
		index,
		data,
		size,
		USB_CTRL_SET_TIMEOUT);
}

static void ax8817x_async_cmd_callback(struct urb *urb, struct pt_regs *regs)
{
	struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;

	if (urb->status < 0)
		printk(KERN_DEBUG "ax8817x_async_cmd_callback() failed with %d",
			urb->status);

	kfree(req);
	usb_free_urb(urb);
}

static void ax8817x_status(struct usbnet *dev, struct urb *urb)
{
	struct ax88172_int_data *event;
	int link;

	if (urb->actual_length < 8)
		return;

	event = urb->transfer_buffer;
	link = event->link & 0x01;
	if (netif_carrier_ok(dev->net) != link) {
		if (link) {
			netif_carrier_on(dev->net);
			usbnet_defer_kevent (dev, EVENT_LINK_RESET );
		} else
			netif_carrier_off(dev->net);
		devdbg(dev, "ax8817x - Link Status is: %d", link);
	}
}

static void
ax8817x_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value, u16 index,
				    u16 size, void *data)
{
	struct usb_ctrlrequest *req;
	int status;
	struct urb *urb;

	if ((urb = usb_alloc_urb(0, GFP_ATOMIC)) == NULL) {
		devdbg(dev, "Error allocating URB in write_cmd_async!");
		return;
	}

	if ((req = kmalloc(sizeof(struct usb_ctrlrequest), GFP_ATOMIC)) == NULL) {
		deverr(dev, "Failed to allocate memory for control request");
		usb_free_urb(urb);
		return;
	}

	req->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE;
	req->bRequest = cmd;
	req->wValue = cpu_to_le16(value);
	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,
			     ax8817x_async_cmd_callback, req);

	if((status = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
		deverr(dev, "Error submitting the control message: status=%d",
				status);
		kfree(req);
		usb_free_urb(urb);
	}
}

static void ax8817x_set_multicast(struct net_device *net)
{
	struct usbnet *dev = netdev_priv(net);
	struct ax8817x_data *data = (struct ax8817x_data *)&dev->data;
	u8 rx_ctl = 0x8c;

	if (net->flags & IFF_PROMISC) {
		rx_ctl |= 0x01;
	} else if (net->flags & IFF_ALLMULTI
		   || net->mc_count > AX_MAX_MCAST) {
		rx_ctl |= 0x02;
	} 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, AX_MCAST_FILTER_SIZE);

		/* 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;
		}

		ax8817x_write_cmd_async(dev, AX_CMD_WRITE_MULTI_FILTER, 0, 0,
				   AX_MCAST_FILTER_SIZE, data->multi_filter);

		rx_ctl |= 0x10;
	}

	ax8817x_write_cmd_async(dev, AX_CMD_WRITE_RX_CTL, rx_ctl, 0, 0, NULL);
}

static int ax8817x_mdio_read(struct net_device *netdev, int phy_id, int loc)
{
	struct usbnet *dev = netdev_priv(netdev);
	u16 res;
	u8 buf[1];

	ax8817x_write_cmd(dev, AX_CMD_SET_SW_MII, 0, 0, 0, &buf);
	ax8817x_read_cmd(dev, AX_CMD_READ_MII_REG, phy_id,
				(__u16)loc, 2, (u16 *)&res);
	ax8817x_write_cmd(dev, AX_CMD_SET_HW_MII, 0, 0, 0, &buf);

	return res & 0xffff;
}

/* same as above, but converts resulting value to cpu byte order */
static int ax8817x_mdio_read_le(struct net_device *netdev, int phy_id, int loc)
{
	return le16_to_cpu(ax8817x_mdio_read(netdev,phy_id, loc));
}

static void
ax8817x_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
{
	struct usbnet *dev = netdev_priv(netdev);
	u16 res = val;
	u8 buf[1];

	ax8817x_write_cmd(dev, AX_CMD_SET_SW_MII, 0, 0, 0, &buf);
	ax8817x_write_cmd(dev, AX_CMD_WRITE_MII_REG, phy_id,
				(__u16)loc, 2, (u16 *)&res);
	ax8817x_write_cmd(dev, AX_CMD_SET_HW_MII, 0, 0, 0, &buf);
}

/* same as above, but converts new value to le16 byte order before writing */
static void
ax8817x_mdio_write_le(struct net_device *netdev, int phy_id, int loc, int val)
{
	ax8817x_mdio_write( netdev, phy_id, loc, cpu_to_le16(val) );
}

static int ax88172_link_reset(struct usbnet *dev)
{
	u16 lpa;
	u16 adv;
	u16 res;
	u8 mode;

	mode = AX_MEDIUM_TX_ABORT_ALLOW | AX_MEDIUM_FLOW_CONTROL_EN;
	lpa = ax8817x_mdio_read_le(dev->net, dev->mii.phy_id, MII_LPA);
	adv = ax8817x_mdio_read_le(dev->net, dev->mii.phy_id, MII_ADVERTISE);
	res = mii_nway_result(lpa|adv);
	if (res & LPA_DUPLEX)
		mode |= AX_MEDIUM_FULL_DUPLEX;
	ax8817x_write_cmd(dev, AX_CMD_WRITE_MEDIUM_MODE, mode, 0, 0, NULL);

	return 0;
}

static void
ax8817x_get_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
{
	struct usbnet *dev = netdev_priv(net);
	u8 opt;

	if (ax8817x_read_cmd(dev, AX_CMD_READ_MONITOR_MODE, 0, 0, 1, &opt) < 0) {
		wolinfo->supported = 0;
		wolinfo->wolopts = 0;
		return;
	}
	wolinfo->supported = WAKE_PHY | WAKE_MAGIC;
	wolinfo->wolopts = 0;
	if (opt & AX_MONITOR_MODE) {
		if (opt & AX_MONITOR_LINK)
			wolinfo->wolopts |= WAKE_PHY;
		if (opt & AX_MONITOR_MAGIC)
			wolinfo->wolopts |= WAKE_MAGIC;
	}
}

static int
ax8817x_set_wol(struct net_device *net, struct ethtool_wolinfo *wolinfo)
{
	struct usbnet *dev = netdev_priv(net);
	u8 opt = 0;
	u8 buf[1];

	if (wolinfo->wolopts & WAKE_PHY)
		opt |= AX_MONITOR_LINK;
	if (wolinfo->wolopts & WAKE_MAGIC)
		opt |= AX_MONITOR_MAGIC;
	if (opt != 0)
		opt |= AX_MONITOR_MODE;

	if (ax8817x_write_cmd(dev, AX_CMD_WRITE_MONITOR_MODE,
			      opt, 0, 0, &buf) < 0)
		return -EINVAL;

	return 0;
}

static int ax8817x_get_eeprom_len(struct net_device *net)
{
	return AX_EEPROM_LEN;
}

static int ax8817x_get_eeprom(struct net_device *net,
			      struct ethtool_eeprom *eeprom, u8 *data)
{
	struct usbnet *dev = netdev_priv(net);
	u16 *ebuf = (u16 *)data;
	int i;

	/* Crude hack to ensure that we don't overwrite memory
	 * if an odd length is supplied
	 */
	if (eeprom->len % 2)
		return -EINVAL;

	eeprom->magic = AX_EEPROM_MAGIC;

	/* ax8817x returns 2 bytes from eeprom on read */
	for (i=0; i < eeprom->len / 2; i++) {
		if (ax8817x_read_cmd(dev, AX_CMD_READ_EEPROM,
			eeprom->offset + i, 0, 2, &ebuf[i]) < 0)
			return -EINVAL;
	}
	return 0;
}

static void ax8817x_get_drvinfo (struct net_device *net,
				 struct ethtool_drvinfo *info)
{
	/* Inherit standard device info */
	usbnet_get_drvinfo(net, info);
	info->eedump_len = 0x3e;
}

static int ax8817x_get_settings(struct net_device *net, struct ethtool_cmd *cmd)
{
	struct usbnet *dev = netdev_priv(net);

	return mii_ethtool_gset(&dev->mii,cmd);
}

static int ax8817x_set_settings(struct net_device *net, struct ethtool_cmd *cmd)
{
	struct usbnet *dev = netdev_priv(net);

	return mii_ethtool_sset(&dev->mii,cmd);
}

/* We need to override some ethtool_ops so we require our
   own structure so we don't interfere with other usbnet
   devices that may be connected at the same time. */
static struct ethtool_ops ax8817x_ethtool_ops = {
	.get_drvinfo		= ax8817x_get_drvinfo,
	.get_link		= ethtool_op_get_link,
	.get_msglevel		= usbnet_get_msglevel,
	.set_msglevel		= usbnet_set_msglevel,
	.get_wol		= ax8817x_get_wol,
	.set_wol		= ax8817x_set_wol,
	.get_eeprom_len		= ax8817x_get_eeprom_len,
	.get_eeprom		= ax8817x_get_eeprom,
	.get_settings		= ax8817x_get_settings,
	.set_settings		= ax8817x_set_settings,
};

static int ax8817x_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);
}

static int ax8817x_bind(struct usbnet *dev, struct usb_interface *intf)
{
	int ret = 0;
	void *buf;
	int i;
	unsigned long gpio_bits = dev->driver_info->data;

	usbnet_get_endpoints(dev,intf);

	buf = kmalloc(ETH_ALEN, GFP_KERNEL);
	if(!buf) {
		ret = -ENOMEM;
		goto out1;
	}

	/* Toggle the GPIOs in a manufacturer/model specific way */
	for (i = 2; i >= 0; i--) {
		if ((ret = ax8817x_write_cmd(dev, AX_CMD_WRITE_GPIOS,
					(gpio_bits >> (i * 8)) & 0xff, 0, 0,
					buf)) < 0)
			goto out2;
		msleep(5);
	}

	if ((ret = ax8817x_write_cmd(dev, AX_CMD_WRITE_RX_CTL,
				0x80, 0, 0, buf)) < 0) {
		dbg("send AX_CMD_WRITE_RX_CTL failed: %d", ret);
		goto out2;
	}

	/* Get the MAC address */
	memset(buf, 0, ETH_ALEN);
	if ((ret = ax8817x_read_cmd(dev, AX_CMD_READ_NODE_ID,