pegasus.c

h内核

/*
 *  Copyright (c) 1999-2003 Petko Manolov ([e-mail])
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *	ChangeLog:
 *		....	Most of the time spent on reading sources & docs.
 *		v0.2.x	First official release for the Linux kernel.
 *		v0.3.0	Beutified and structured, some bugs fixed.
 *		v0.3.x	URBifying bulk requests and bugfixing. First relatively
 *			stable release. Still can touch device's registers only
 *			from top-halves.
 *		v0.4.0	Control messages remained unurbified are now URBs.
 *			Now we can touch the HW at any time.
 *		v0.4.9	Control urbs again use process context to wait. Argh...
 *			Some long standing bugs (enable_net_traffic) fixed.
 *			Also nasty trick about resubmiting control urb from
 *			interrupt context used. Please let me know how it
 *			behaves. Pegasus II support added since this version.
 *			TODO: suppressing HCD warnings spewage on disconnect.
 *		v0.4.13	Ethernet address is now set at probe(), not at open()
 *			time as this seems to break dhcpd. 
 *		v0.5.0	branch to 2.5.x kernels
 *		v0.5.1	ethtool support added
 *		v0.5.5	rx socket buffers are in a pool and the their allocation
 * 			is out of the interrupt routine.
 */

#undef	DEBUG

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/mii.h>
#include <linux/usb.h>
#include <linux/module.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>
#include "pegasus.h"

/*
 * Version Information
 */
#define DRIVER_VERSION "v0.5.12 (2005/01/13)"
#define DRIVER_AUTHOR "Petko Manolov <[e-mail]>"
#define DRIVER_DESC "Pegasus/Pegasus II USB Ethernet driver"

static const char driver_name[] = "pegasus";

#undef	PEGASUS_WRITE_EEPROM
#define	BMSR_MEDIA	(BMSR_10HALF | BMSR_10FULL | BMSR_100HALF | \
			BMSR_100FULL | BMSR_ANEGCAPABLE)

static int loopback = 0;
static int mii_mode = 0;
static int multicast_filter_limit = 32;

static struct usb_eth_dev usb_dev_id[] = {
#define	PEGASUS_DEV(pn, vid, pid, flags)	\
	{.name = pn, .vendor = vid, .device = pid, .private = flags},
#include "pegasus.h"
#undef	PEGASUS_DEV
	{NULL, 0, 0, 0}
};

static struct usb_device_id pegasus_ids[] = {
#define	PEGASUS_DEV(pn, vid, pid, flags) \
	{.match_flags = USB_DEVICE_ID_MATCH_DEVICE, .idVendor = vid, .idProduct = pid},
#include "pegasus.h"
#undef	PEGASUS_DEV
	{}
};

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
module_param(loopback, bool, 0);
module_param(mii_mode, bool, 0);
MODULE_PARM_DESC(loopback, "Enable MAC loopback mode (bit 0)");
MODULE_PARM_DESC(mii_mode, "Enable HomePNA mode (bit 0),default=MII mode = 0");

MODULE_DEVICE_TABLE(usb, pegasus_ids);

static int update_eth_regs_async(pegasus_t *);
/* Aargh!!! I _really_ hate such tweaks */
static void ctrl_callback(struct urb *urb, struct pt_regs *regs)
{
	pegasus_t *pegasus = urb->context;

	if (!pegasus)
		return;

	switch (urb->status) {
	case 0:
		if (pegasus->flags & ETH_REGS_CHANGE) {
			pegasus->flags &= ~ETH_REGS_CHANGE;
			pegasus->flags |= ETH_REGS_CHANGED;
			update_eth_regs_async(pegasus);
			return;
		}
		break;
	case -EINPROGRESS:
		return;
	case -ENOENT:
		break;
	default:
		warn("%s: status %d", __FUNCTION__, urb->status);
	}
	pegasus->flags &= ~ETH_REGS_CHANGED;
	wake_up(&pegasus->ctrl_wait);
}

static int get_registers(pegasus_t * pegasus, __u16 indx, __u16 size,
			 void *data)
{
	int ret;
	char *buffer;
	DECLARE_WAITQUEUE(wait, current);

	buffer = kmalloc(size, GFP_KERNEL);
	if (!buffer) {
		warn("%s: looks like we're out of memory", __FUNCTION__);
		return -ENOMEM;
	}
	add_wait_queue(&pegasus->ctrl_wait, &wait);
	set_current_state(TASK_UNINTERRUPTIBLE);
	while (pegasus->flags & ETH_REGS_CHANGED)
		schedule();
	remove_wait_queue(&pegasus->ctrl_wait, &wait);
	set_current_state(TASK_RUNNING);

	pegasus->dr.bRequestType = PEGASUS_REQT_READ;
	pegasus->dr.bRequest = PEGASUS_REQ_GET_REGS;
	pegasus->dr.wValue = cpu_to_le16(0);
	pegasus->dr.wIndex = cpu_to_le16p(&indx);
	pegasus->dr.wLength = cpu_to_le16p(&size);
	pegasus->ctrl_urb->transfer_buffer_length = size;

	usb_fill_control_urb(pegasus->ctrl_urb, pegasus->usb,
			     usb_rcvctrlpipe(pegasus->usb, 0),
			     (char *) &pegasus->dr,
			     buffer, size, ctrl_callback, pegasus);

	add_wait_queue(&pegasus->ctrl_wait, &wait);
	set_current_state(TASK_UNINTERRUPTIBLE);

	/* using ATOMIC, we'd never wake up if we slept */
	if ((ret = usb_submit_urb(pegasus->ctrl_urb, GFP_ATOMIC))) {
		err("%s: BAD CTRLs %d", __FUNCTION__, ret);
		goto out;
	}

	schedule();
out:
	remove_wait_queue(&pegasus->ctrl_wait, &wait);
	memcpy(data, buffer, size);
	kfree(buffer);

	return ret;
}

static int set_registers(pegasus_t * pegasus, __u16 indx, __u16 size,
			 void *data)
{
	int ret;
	char *buffer;
	DECLARE_WAITQUEUE(wait, current);

	buffer = kmalloc(size, GFP_KERNEL);
	if (!buffer) {
		warn("%s: looks like we're out of memory", __FUNCTION__);
		return -ENOMEM;
	}
	memcpy(buffer, data, size);

	add_wait_queue(&pegasus->ctrl_wait, &wait);
	set_current_state(TASK_UNINTERRUPTIBLE);
	while (pegasus->flags & ETH_REGS_CHANGED)
		schedule();
	remove_wait_queue(&pegasus->ctrl_wait, &wait);
	set_current_state(TASK_RUNNING);

	pegasus->dr.bRequestType = PEGASUS_REQT_WRITE;
	pegasus->dr.bRequest = PEGASUS_REQ_SET_REGS;
	pegasus->dr.wValue = cpu_to_le16(0);
	pegasus->dr.wIndex = cpu_to_le16p(&indx);
	pegasus->dr.wLength = cpu_to_le16p(&size);
	pegasus->ctrl_urb->transfer_buffer_length = size;

	usb_fill_control_urb(pegasus->ctrl_urb, pegasus->usb,
			     usb_sndctrlpipe(pegasus->usb, 0),
			     (char *) &pegasus->dr,
			     buffer, size, ctrl_callback, pegasus);

	add_wait_queue(&pegasus->ctrl_wait, &wait);
	set_current_state(TASK_UNINTERRUPTIBLE);

	if ((ret = usb_submit_urb(pegasus->ctrl_urb, GFP_ATOMIC))) {
		err("%s: BAD CTRL %d", __FUNCTION__, ret);
		goto out;
	}

	schedule();
out:
	remove_wait_queue(&pegasus->ctrl_wait, &wait);
	kfree(buffer);

	return ret;
}

static int set_register(pegasus_t * pegasus, __u16 indx, __u8 data)
{
	int ret;
	char *tmp;
	DECLARE_WAITQUEUE(wait, current);

	tmp = kmalloc(1, GFP_KERNEL);
	if (!tmp) {
		warn("%s: looks like we're out of memory", __FUNCTION__);
		return -ENOMEM;
	}
	memcpy(tmp, &data, 1);
	add_wait_queue(&pegasus->ctrl_wait, &wait);
	set_current_state(TASK_UNINTERRUPTIBLE);
	while (pegasus->flags & ETH_REGS_CHANGED)
		schedule();
	remove_wait_queue(&pegasus->ctrl_wait, &wait);
	set_current_state(TASK_RUNNING);

	pegasus->dr.bRequestType = PEGASUS_REQT_WRITE;
	pegasus->dr.bRequest = PEGASUS_REQ_SET_REG;
	pegasus->dr.wValue = cpu_to_le16(data);
	pegasus->dr.wIndex = cpu_to_le16p(&indx);
	pegasus->dr.wLength = cpu_to_le16(1);
	pegasus->ctrl_urb->transfer_buffer_length = 1;

	usb_fill_control_urb(pegasus->ctrl_urb, pegasus->usb,
			     usb_sndctrlpipe(pegasus->usb, 0),
			     (char *) &pegasus->dr,
			     &tmp, 1, ctrl_callback, pegasus);

	add_wait_queue(&pegasus->ctrl_wait, &wait);
	set_current_state(TASK_UNINTERRUPTIBLE);

	if ((ret = usb_submit_urb(pegasus->ctrl_urb, GFP_ATOMIC))) {
		err("%s: BAD CTRL %d", __FUNCTION__, ret);
		goto out;
	}

	schedule();
out:
	remove_wait_queue(&pegasus->ctrl_wait, &wait);
	kfree(tmp);

	return ret;
}

static int update_eth_regs_async(pegasus_t * pegasus)
{
	int ret;

	pegasus->dr.bRequestType = PEGASUS_REQT_WRITE;
	pegasus->dr.bRequest = PEGASUS_REQ_SET_REGS;
	pegasus->dr.wValue = 0;
	pegasus->dr.wIndex = cpu_to_le16(EthCtrl0);
	pegasus->dr.wLength = cpu_to_le16(3);
	pegasus->ctrl_urb->transfer_buffer_length = 3;

	usb_fill_control_urb(pegasus->ctrl_urb, pegasus->usb,
			     usb_sndctrlpipe(pegasus->usb, 0),
			     (char *) &pegasus->dr,
			     pegasus->eth_regs, 3, ctrl_callback, pegasus);

	if ((ret = usb_submit_urb(pegasus->ctrl_urb, GFP_ATOMIC)))
		err("%s: BAD CTRL %d, flgs %x", __FUNCTION__, ret,
		    pegasus->flags);

	return ret;
}

static int read_mii_word(pegasus_t * pegasus, __u8 phy, __u8 indx, __u16 * regd)
{
	int i;
	__u8 data[4] = { phy, 0, 0, indx };
	__le16 regdi;

	set_register(pegasus, PhyCtrl, 0);
	set_registers(pegasus, PhyAddr, sizeof (data), data);
	set_register(pegasus, PhyCtrl, (indx | PHY_READ));
	for (i = 0; i < REG_TIMEOUT; i++) {
		get_registers(pegasus, PhyCtrl, 1, data);
		if (data[0] & PHY_DONE)
			break;
	}
	if (i < REG_TIMEOUT) {
		get_registers(pegasus, PhyData, 2, &regdi);
		*regd = le16_to_cpu(regdi);
		return 0;
	}
	warn("%s: failed", __FUNCTION__);

	return 1;
}

static int mdio_read(struct net_device *dev, int phy_id, int loc)
{
	pegasus_t *pegasus = (pegasus_t *) netdev_priv(dev);
	int res;

	read_mii_word(pegasus, phy_id, loc, (u16 *) & res);
	return res & 0xffff;
}

static int write_mii_word(pegasus_t * pegasus, __u8 phy, __u8 indx, __u16 regd)
{
	int i;
	__u8 data[4] = { phy, 0, 0, indx };

	*(data + 1) = cpu_to_le16p(&regd);
	set_register(pegasus, PhyCtrl, 0);
	set_registers(pegasus, PhyAddr, sizeof(data), data);
	set_register(pegasus, PhyCtrl, (indx | PHY_WRITE));
	for (i = 0; i < REG_TIMEOUT; i++) {
		get_registers(pegasus, PhyCtrl, 1, data);
		if (data[0] & PHY_DONE)
			break;
	}
	if (i < REG_TIMEOUT)
		return 0;
	warn("%s: failed", __FUNCTION__);

	return 1;
}

static void mdio_write(struct net_device *dev, int phy_id, int loc, int val)
{
	pegasus_t *pegasus = (pegasus_t *) netdev_priv(dev);

	write_mii_word(pegasus, phy_id, loc, val);
}

static int read_eprom_word(pegasus_t * pegasus, __u8 index, __u16 * retdata)
{
	int i;
	__u8 tmp;
	__le16 retdatai;

	set_register(pegasus, EpromCtrl, 0);
	set_register(pegasus, EpromOffset, index);
	set_register(pegasus, EpromCtrl, EPROM_READ);

	for (i = 0; i < REG_TIMEOUT; i++) {
		get_registers(pegasus, EpromCtrl, 1, &tmp);
		if (tmp & EPROM_DONE)
			break;
	}
	if (i < REG_TIMEOUT) {
		get_registers(pegasus, EpromData, 2, &retdatai);
		*retdata = le16_to_cpu(retdatai);
		return 0;
	}
	warn("%s: failed", __FUNCTION__);

	return -1;
}

#ifdef	PEGASUS_WRITE_EEPROM
static inline void enable_eprom_write(pegasus_t * pegasus)
{
	__u8 tmp;

	get_registers(pegasus, EthCtrl2, 1, &tmp);
	set_register(pegasus, EthCtrl2, tmp | EPROM_WR_ENABLE);
}

static inline void disable_eprom_write(pegasus_t * pegasus)
{
	__u8 tmp;

	get_registers(pegasus, EthCtrl2, 1, &tmp);
	set_register(pegasus, EpromCtrl, 0);
	set_register(pegasus, EthCtrl2, tmp & ~EPROM_WR_ENABLE);
}

static int write_eprom_word(pegasus_t * pegasus, __u8 index, __u16 data)
{
	int i;
	__u8 tmp, d[4] = { 0x3f, 0, 0, EPROM_WRITE };

	set_registers(pegasus, EpromOffset, 4, d);
	enable_eprom_write(pegasus);
	set_register(pegasus, EpromOffset, index);
	set_registers(pegasus, EpromData, 2, &data);
	set_register(pegasus, EpromCtrl, EPROM_WRITE);

	for (i = 0; i < REG_TIMEOUT; i++) {
		get_registers(pegasus, EpromCtrl, 1, &tmp);
		if (tmp & EPROM_DONE)
			break;
	}
	disable_eprom_write(pegasus);
	if (i < REG_TIMEOUT)
		return 0;
	warn("%s: failed", __FUNCTION__);
	return -1;
}
#endif				/* PEGASUS_WRITE_EEPROM */

static inline void get_node_id(pegasus_t * pegasus, __u8 * id)
{
	int i;
	__u16 w16;

	for (i = 0; i < 3; i++) {
		read_eprom_word(pegasus, i, &w16);
		((__le16 *) id)[i] = cpu_to_le16p(&w16);
	}
}

static void set_ethernet_addr(pegasus_t * pegasus)
{
	__u8 node_id[6];

	get_node_id(pegasus, node_id);
	set_registers(pegasus, EthID, sizeof (node_id), node_id);
	memcpy(pegasus->net->dev_addr, node_id, sizeof (node_id));