asix.c

linux 内核源代码

/*
 * ASIX AX8817X based USB 2.0 Ethernet Devices
 * Copyright (C) 2003-2006 David Hollis <[e-mail]>
 * Copyright (C) 2005 Phil Chang <[e-mail]>
 * Copyright (C) 2006 James Painter <[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/module.h>
#include <linux/kmod.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"

#define DRIVER_VERSION "14-Jun-2006"
static const char driver_name [] = "asix";

/* 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_READ_RX_CTL		0x0f
#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_READ_NODE_ID		0x13
#define AX_CMD_WRITE_IPG2		0x14
#define AX_CMD_WRITE_MULTI_FILTER	0x16
#define AX88172_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_READ_GPIOS		0x1e
#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 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 AX88172_MEDIUM_FD		0x02
#define AX88172_MEDIUM_TX		0x04
#define AX88172_MEDIUM_FC		0x10
#define AX88172_MEDIUM_DEFAULT \
		( AX88172_MEDIUM_FD | AX88172_MEDIUM_TX | AX88172_MEDIUM_FC )

#define AX_MCAST_FILTER_SIZE		8
#define AX_MAX_MCAST			64

#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

/* AX88772 & AX88178 Medium Mode Register */
#define AX_MEDIUM_PF		0x0080
#define AX_MEDIUM_JFE		0x0040
#define AX_MEDIUM_TFC		0x0020
#define AX_MEDIUM_RFC		0x0010
#define AX_MEDIUM_ENCK		0x0008
#define AX_MEDIUM_AC		0x0004
#define AX_MEDIUM_FD		0x0002
#define AX_MEDIUM_GM		0x0001
#define AX_MEDIUM_SM		0x1000
#define AX_MEDIUM_SBP		0x0800
#define AX_MEDIUM_PS		0x0200
#define AX_MEDIUM_RE		0x0100

#define AX88178_MEDIUM_DEFAULT	\
	(AX_MEDIUM_PS | AX_MEDIUM_FD | AX_MEDIUM_AC | \
	 AX_MEDIUM_RFC | AX_MEDIUM_TFC | AX_MEDIUM_JFE | \
	 AX_MEDIUM_RE )

#define AX88772_MEDIUM_DEFAULT	\
	(AX_MEDIUM_FD | AX_MEDIUM_RFC | \
	 AX_MEDIUM_TFC | AX_MEDIUM_PS | \
	 AX_MEDIUM_AC | AX_MEDIUM_RE )

/* AX88772 & AX88178 RX_CTL values */
#define AX_RX_CTL_SO			0x0080
#define AX_RX_CTL_AP			0x0020
#define AX_RX_CTL_AM			0x0010
#define AX_RX_CTL_AB			0x0008
#define AX_RX_CTL_SEP			0x0004
#define AX_RX_CTL_AMALL			0x0002
#define AX_RX_CTL_PRO			0x0001
#define AX_RX_CTL_MFB_2048		0x0000
#define AX_RX_CTL_MFB_4096		0x0100
#define AX_RX_CTL_MFB_8192		0x0200
#define AX_RX_CTL_MFB_16384		0x0300

#define AX_DEFAULT_RX_CTL	\
	(AX_RX_CTL_SO | AX_RX_CTL_AB )

/* GPIO 0 .. 2 toggles */
#define AX_GPIO_GPO0EN		0x01	/* GPIO0 Output enable */
#define AX_GPIO_GPO_0		0x02	/* GPIO0 Output value */
#define AX_GPIO_GPO1EN		0x04	/* GPIO1 Output enable */
#define AX_GPIO_GPO_1		0x08	/* GPIO1 Output value */
#define AX_GPIO_GPO2EN		0x10	/* GPIO2 Output enable */
#define AX_GPIO_GPO_2		0x20	/* GPIO2 Output value */
#define AX_GPIO_RESERVED	0x40	/* Reserved */
#define AX_GPIO_RSE		0x80	/* Reload serial EEPROM */

#define AX_EEPROM_MAGIC		0xdeadbeef
#define AX88172_EEPROM_LEN	0x40
#define AX88772_EEPROM_LEN	0xff

#define PHY_MODE_MARVELL	0x0000
#define MII_MARVELL_LED_CTRL	0x0018
#define MII_MARVELL_STATUS	0x001b
#define MII_MARVELL_CTRL	0x0014

#define MARVELL_LED_MANUAL	0x0019

#define MARVELL_STATUS_HWCFG	0x0004

#define MARVELL_CTRL_TXDELAY	0x0002
#define MARVELL_CTRL_RXDELAY	0x0080

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

struct ax88172_int_data {
	__le16 res1;
	u8 link;
	__le16 res2;
	u8 status;
	__le16 res3;
} __attribute__ ((packed));

static int asix_read_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
			    u16 size, void *data)
{
	void *buf;
	int err = -ENOMEM;

	devdbg(dev,"asix_read_cmd() cmd=0x%02x value=0x%04x index=0x%04x size=%d",
		cmd, value, index, size);

	buf = kmalloc(size, GFP_KERNEL);
	if (!buf)
		goto out;

	err = usb_control_msg(
		dev->udev,
		usb_rcvctrlpipe(dev->udev, 0),
		cmd,
		USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
		value,
		index,
		buf,
		size,
		USB_CTRL_GET_TIMEOUT);
	if (err == size)
		memcpy(data, buf, size);
	else if (err >= 0)
		err = -EINVAL;
	kfree(buf);

out:
	return err;
}

static int asix_write_cmd(struct usbnet *dev, u8 cmd, u16 value, u16 index,
			     u16 size, void *data)
{
	void *buf = NULL;
	int err = -ENOMEM;

	devdbg(dev,"asix_write_cmd() cmd=0x%02x value=0x%04x index=0x%04x size=%d",
		cmd, value, index, size);

	if (data) {
		buf = kmalloc(size, GFP_KERNEL);
		if (!buf)
			goto out;
		memcpy(buf, data, size);
	}

	err = usb_control_msg(
		dev->udev,
		usb_sndctrlpipe(dev->udev, 0),
		cmd,
		USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
		value,
		index,
		buf,
		size,
		USB_CTRL_SET_TIMEOUT);
	kfree(buf);

out:
	return err;
}

static void asix_async_cmd_callback(struct urb *urb)
{
	struct usb_ctrlrequest *req = (struct usb_ctrlrequest *)urb->context;

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

	kfree(req);
	usb_free_urb(urb);
}

static void
asix_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;

	devdbg(dev,"asix_write_cmd_async() cmd=0x%02x value=0x%04x index=0x%04x size=%d",
		cmd, value, index, size);
	if ((urb = usb_alloc_urb(0, GFP_ATOMIC)) == NULL) {
		deverr(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,
			     asix_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 int asix_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
{
	u8  *head;
	u32  header;
	char *packet;
	struct sk_buff *ax_skb;
	u16 size;

	head = (u8 *) skb->data;
	memcpy(&header, head, sizeof(header));
	le32_to_cpus(&header);
	packet = head + sizeof(header);

	skb_pull(skb, 4);

	while (skb->len > 0) {
		if ((short)(header & 0x0000ffff) !=
		    ~((short)((header & 0xffff0000) >> 16))) {
			deverr(dev,"asix_rx_fixup() Bad Header Length");
		}
		/* get the packet length */
		size = (u16) (header & 0x0000ffff);

		if ((skb->len) - ((size + 1) & 0xfffe) == 0)
			return 2;
		if (size > ETH_FRAME_LEN) {
			deverr(dev,"asix_rx_fixup() Bad RX Length %d", size);
			return 0;
		}
		ax_skb = skb_clone(skb, GFP_ATOMIC);
		if (ax_skb) {
			ax_skb->len = size;
			ax_skb->data = packet;
			skb_set_tail_pointer(ax_skb, size);
			usbnet_skb_return(dev, ax_skb);
		} else {
			return 0;
		}

		skb_pull(skb, (size + 1) & 0xfffe);

		if (skb->len == 0)
			break;

		head = (u8 *) skb->data;
		memcpy(&header, head, sizeof(header));
		le32_to_cpus(&header);
		packet = head + sizeof(header);
		skb_pull(skb, 4);
	}

	if (skb->len < 0) {
		deverr(dev,"asix_rx_fixup() Bad SKB Length %d", skb->len);
		return 0;
	}
	return 1;
}

static struct sk_buff *asix_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
					gfp_t flags)
{
	int padlen;
	int headroom = skb_headroom(skb);
	int tailroom = skb_tailroom(skb);
	u32 packet_len;
	u32 padbytes = 0xffff0000;

	padlen = ((skb->len + 4) % 512) ? 0 : 4;

	if ((!skb_cloned(skb))
	    && ((headroom + tailroom) >= (4 + padlen))) {
		if ((headroom < 4) || (tailroom < padlen)) {
			skb->data = memmove(skb->head + 4, skb->data, skb->len);
			skb_set_tail_pointer(skb, skb->len);
		}
	} else {
		struct sk_buff *skb2;
		skb2 = skb_copy_expand(skb, 4, padlen, flags);
		dev_kfree_skb_any(skb);
		skb = skb2;
		if (!skb)
			return NULL;
	}

	skb_push(skb, 4);
	packet_len = (((skb->len - 4) ^ 0x0000ffff) << 16) + (skb->len - 4);
	cpu_to_le32s(&packet_len);
	skb_copy_to_linear_data(skb, &packet_len, sizeof(packet_len));

	if ((skb->len % 512) == 0) {
		cpu_to_le32s(&padbytes);
		memcpy(skb_tail_pointer(skb), &padbytes, sizeof(padbytes));
		skb_put(skb, sizeof(padbytes));
	}
	return skb;
}

static void asix_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, "Link Status is: %d", link);
	}
}

static inline int asix_set_sw_mii(struct usbnet *dev)
{
	int ret;
	ret = asix_write_cmd(dev, AX_CMD_SET_SW_MII, 0x0000, 0, 0, NULL);
	if (ret < 0)
		deverr(dev, "Failed to enable software MII access");
	return ret;
}

static inline int asix_set_hw_mii(struct usbnet *dev)
{
	int ret;
	ret = asix_write_cmd(dev, AX_CMD_SET_HW_MII, 0x0000, 0, 0, NULL);
	if (ret < 0)
		deverr(dev, "Failed to enable hardware MII access");
	return ret;
}

static inline int asix_get_phy_addr(struct usbnet *dev)
{
	u8 buf[2];
	int ret = asix_read_cmd(dev, AX_CMD_READ_PHY_ID, 0, 0, 2, buf);

	devdbg(dev, "asix_get_phy_addr()");

	if (ret < 0) {
		deverr(dev, "Error reading PHYID register: %02x", ret);
		goto out;
	}
	devdbg(dev, "asix_get_phy_addr() returning 0x%04x", *((__le16 *)buf));
	ret = buf[1];

out:
	return ret;
}

static int asix_sw_reset(struct usbnet *dev, u8 flags)
{
	int ret;

        ret = asix_write_cmd(dev, AX_CMD_SW_RESET, flags, 0, 0, NULL);
	if (ret < 0)
		deverr(dev,"Failed to send software reset: %02x", ret);

	return ret;
}

static u16 asix_read_rx_ctl(struct usbnet *dev)
{
	__le16 v;
	int ret = asix_read_cmd(dev, AX_CMD_READ_RX_CTL, 0, 0, 2, &v);

	if (ret < 0) {
		deverr(dev, "Error reading RX_CTL register: %02x", ret);
		goto out;
	}
	ret = le16_to_cpu(v);
out:
	return ret;
}

static int asix_write_rx_ctl(struct usbnet *dev, u16 mode)
{
	int ret;

	devdbg(dev,"asix_write_rx_ctl() - mode = 0x%04x", mode);
	ret = asix_write_cmd(dev, AX_CMD_WRITE_RX_CTL, mode, 0, 0, NULL);
	if (ret < 0)
		deverr(dev, "Failed to write RX_CTL mode to 0x%04x: %02x",
		       mode, ret);

	return ret;
}

static u16 asix_read_medium_status(struct usbnet *dev)
{