rtl8150.c

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/*
 * Copyright (c) 2002 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 as
 *	published by the Free Software Foundation; either version 2 of
 *	the License, or (at your option) any later version.
 *
 */

#include <linux/config.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/usb.h>
#include <asm/uaccess.h>

/* Version Information */
#define DRIVER_VERSION "v0.5.4 (2002/04/11)"
#define DRIVER_AUTHOR "Petko Manolov <[e-mail]>"
#define DRIVER_DESC "rtl8150 based usb-ethernet driver"

#define	IRD			0x0120
#define	MAR			0x0126
#define	CR			0x012e
#define	TCR			0x012f
#define	RCR			0x0130
#define	TSR			0x0132
#define	RSR			0x0133
#define	CON0			0x0135
#define	CON1			0x0136
#define	MSR			0x0137
#define	PHYADD			0x0138
#define	PHYDAT			0x0139
#define	PHYCNT			0x013b
#define	GPPC			0x013d
#define	BMCR			0x0140
#define	BMSR			0x0142
#define	ANAR			0x0144
#define	ANLP			0x0146
#define	AER			0x0148

#define	PHY_READ		0
#define	PHY_WRITE		0x20
#define	PHY_GO			0x40

#define	MII_TIMEOUT		10

#define	RTL8150_REQT_READ	0xc0
#define	RTL8150_REQT_WRITE	0x40
#define	RTL8150_REQ_GET_REGS	0x05
#define	RTL8150_REQ_SET_REGS	0x05

#define	RTL8150_MTU		1540
#define	RTL8150_TX_TIMEOUT	(HZ)
#define	RX_SKB_POOL_SIZE	4

/* rtl8150 flags */
#define	RTL8150_HW_CRC		0
#define	RX_REG_SET		1
#define	RTL8150_UNPLUG		2
#define	RX_URB_FAIL		3

/* Define these values to match your device */
#define VENDOR_ID_REALTEK		0x0bda
#define PRODUCT_ID_RTL8150		0x8150

/* table of devices that work with this driver */
static struct usb_device_id rtl8150_table[] = {
	{USB_DEVICE(VENDOR_ID_REALTEK, PRODUCT_ID_RTL8150)},
	{}
};

MODULE_DEVICE_TABLE(usb, rtl8150_table);

struct rtl8150 {
	unsigned long flags;
	struct usb_device *udev;
	struct semaphore sem;
	struct tasklet_struct tl;
	struct net_device_stats stats;
	struct net_device *netdev;
	struct urb *rx_urb, *tx_urb, *intr_urb, *ctrl_urb;
	struct sk_buff *tx_skb, *rx_skb;
	struct sk_buff *rx_skb_pool[RX_SKB_POOL_SIZE];
	spinlock_t rx_pool_lock;
	struct usb_ctrlrequest dr;
	int intr_interval;
	u16 rx_creg;
	u8 intr_buff[8];
	u8 phy;
};

typedef struct rtl8150 rtl8150_t;

/* the global usb devfs handle */
extern devfs_handle_t usb_devfs_handle;
unsigned long multicast_filter_limit = 32;

static void fill_skb_pool(rtl8150_t *);
static void free_skb_pool(rtl8150_t *);
static struct sk_buff *pull_skb(rtl8150_t *);
static void rtl8150_disconnect(struct usb_device *dev, void *ptr);
static void *rtl8150_probe(struct usb_device *dev, unsigned int ifnum,
			   const struct usb_device_id *id);

static struct usb_driver rtl8150_driver = {
	name:		"rtl8150",
	probe:		rtl8150_probe,
	disconnect:	rtl8150_disconnect,
	id_table:	rtl8150_table,
};

/*
**
**	device related part of the code
**
*/
static int get_registers(rtl8150_t * dev, u16 indx, u16 size, void *data)
{
	return usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
			       RTL8150_REQ_GET_REGS, RTL8150_REQT_READ,
			       indx, 0, data, size, HZ / 2);
}

static int set_registers(rtl8150_t * dev, u16 indx, u16 size, void *data)
{
	return usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
			       RTL8150_REQ_SET_REGS, RTL8150_REQT_WRITE,
			       indx, 0, data, size, HZ / 2);
}

static void ctrl_callback(struct urb *urb)
{
	rtl8150_t *dev;

	switch (urb->status) {
	case 0:
		break;
	case -EINPROGRESS:
		break;
	case -ENOENT:
		break;
	default:
		warn("ctrl urb status %d", urb->status);
	}
	dev = urb->context;
	clear_bit(RX_REG_SET, &dev->flags);
}

static int async_set_registers(rtl8150_t * dev, u16 indx, u16 size, void *data)
{
	int ret;

	if (test_bit(RX_REG_SET, &dev->flags))
		return -EAGAIN;

	dev->dr.bRequestType = RTL8150_REQT_WRITE;
	dev->dr.bRequest = RTL8150_REQ_SET_REGS;
	dev->dr.wValue = cpu_to_le16(indx);
	dev->dr.wIndex = 0;
	dev->dr.wLength = cpu_to_le16(size);
	dev->ctrl_urb->transfer_buffer_length = size;
	FILL_CONTROL_URB(dev->ctrl_urb, dev->udev,
			 usb_sndctrlpipe(dev->udev, 0), (char *) &dev->dr,
			 &dev->rx_creg, size, ctrl_callback, dev);
	if ((ret = usb_submit_urb(dev->ctrl_urb, GFP_ATOMIC)))
		err("control request submission failed: %d", ret);
	else
		set_bit(RX_REG_SET, &dev->flags);

	return ret;
}

static int read_mii_word(rtl8150_t * dev, u8 phy, __u8 indx, u16 * reg)
{
	int i;
	u8 data[3], tmp;

	data[0] = phy;
	data[1] = data[2] = 0;
	tmp = indx | PHY_READ | PHY_GO;
	i = 0;

	set_registers(dev, PHYADD, sizeof(data), data);
	set_registers(dev, PHYCNT, 1, &tmp);
	do {
		get_registers(dev, PHYCNT, 1, data);
	} while ((data[0] & PHY_GO) && (i++ < MII_TIMEOUT));

	if (i < MII_TIMEOUT) {
		get_registers(dev, PHYDAT, 2, data);
		*reg = le16_to_cpup(data);
		return 0;
	} else
		return 1;
}

static int write_mii_word(rtl8150_t * dev, u8 phy, __u8 indx, u16 reg)
{
	int i;
	u8 data[3], tmp;

	data[0] = phy;
	*(data + 1) = cpu_to_le16p(&reg);
	tmp = indx | PHY_WRITE | PHY_GO;
	i = 0;

	set_registers(dev, PHYADD, sizeof(data), data);
	set_registers(dev, PHYCNT, 1, &tmp);
	do {
		get_registers(dev, PHYCNT, 1, data);
	} while ((data[0] & PHY_GO) && (i++ < MII_TIMEOUT));

	if (i < MII_TIMEOUT)
		return 0;
	else
		return 1;
}

static inline void set_ethernet_addr(rtl8150_t * dev)
{
	u8 node_id[6];

	get_registers(dev, IRD, sizeof(node_id), node_id);
	memcpy(dev->netdev->dev_addr, node_id, sizeof(node_id));
}

static int rtl8150_reset(rtl8150_t * dev)
{
	u8 data = 0x10;
	int i = HZ;

	set_registers(dev, CR, 1, &data);
	do {
		get_registers(dev, CR, 1, &data);
	} while ((data & 0x10) && --i);

	return (i > 0) ? 1 : 0;
}

static int alloc_all_urbs(rtl8150_t * dev)
{
	dev->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->rx_urb)
		return 0;
	dev->tx_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->tx_urb) {
		usb_free_urb(dev->rx_urb);
		return 0;
	}
	dev->intr_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->intr_urb) {
		usb_free_urb(dev->rx_urb);
		usb_free_urb(dev->tx_urb);
		return 0;
	}
	dev->ctrl_urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->intr_urb) {
		usb_free_urb(dev->rx_urb);
		usb_free_urb(dev->tx_urb);
		usb_free_urb(dev->intr_urb);
		return 0;
	}

	return 1;
}

static void free_all_urbs(rtl8150_t * dev)
{
	usb_free_urb(dev->rx_urb);
	usb_free_urb(dev->tx_urb);
	usb_free_urb(dev->intr_urb);
	usb_free_urb(dev->ctrl_urb);
}

static void unlink_all_urbs(rtl8150_t * dev)
{
	usb_unlink_urb(dev->rx_urb);
	usb_unlink_urb(dev->tx_urb);
	usb_unlink_urb(dev->intr_urb);
	usb_unlink_urb(dev->ctrl_urb);
}

static void read_bulk_callback(struct urb *urb)
{
	rtl8150_t *dev;
	unsigned pkt_len, res;
	struct sk_buff *skb;
	struct net_device *netdev;
	u16 rx_stat;

	dev = urb->context;
	if (!dev)
		return;
	if (test_bit(RTL8150_UNPLUG, &dev->flags))
		return;
	netdev = dev->netdev;
	if (!netif_device_present(netdev))
		return;

	switch (urb->status) {
	case 0:
		break;
	case -ENOENT:
		return;	/* the urb is in unlink state */
	case -ETIMEDOUT:
		warn("reset needed may be?..");
		goto goon;
	default:
		warn("Rx status %d", urb->status);
		goto goon;
	}

	if (!dev->rx_skb)
		goto resched;

	res = urb->actual_length;
	rx_stat = le16_to_cpu(*(short *)(urb->transfer_buffer + res - 4));
	pkt_len = res - 4;

	skb_put(dev->rx_skb, pkt_len);
	dev->rx_skb->protocol = eth_type_trans(dev->rx_skb, netdev);
	netif_rx(dev->rx_skb);
	dev->stats.rx_packets++;
	dev->stats.rx_bytes += pkt_len;
	
	skb = pull_skb(dev);
	if (!skb)
		goto resched;

	skb->dev = netdev;
	skb_reserve(skb, 2);
	dev->rx_skb = skb;
goon:
	FILL_BULK_URB(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
		      dev->rx_skb->data, RTL8150_MTU, read_bulk_callback, dev);
	if (usb_submit_urb(dev->rx_urb, GFP_ATOMIC)) {
		set_bit(RX_URB_FAIL, &dev->flags);
		goto resched;
	} else {
		clear_bit(RX_URB_FAIL, &dev->flags);
	}

	return;
resched:
	tasklet_schedule(&dev->tl);
}

static void rx_fixup(unsigned long data)
{
	rtl8150_t *dev;
	struct sk_buff *skb;

	dev = (rtl8150_t *)data;

	fill_skb_pool(dev);
	if (test_bit(RX_URB_FAIL, &dev->flags))
		if (dev->rx_skb)
			goto try_again;
	if (!(skb = pull_skb(dev)))
		goto tlsched;
	dev->rx_skb = skb;
	FILL_BULK_URB(dev->rx_urb, dev->udev, usb_rcvbulkpipe(dev->udev, 1),
		      dev->rx_skb->data, RTL8150_MTU, read_bulk_callback, dev);
try_again:
	if (usb_submit_urb(dev->rx_urb, GFP_ATOMIC)) {
		set_bit(RX_URB_FAIL, &dev->flags);
		goto tlsched;
	 } else {
		clear_bit(RX_URB_FAIL, &dev->flags);
	}

	return;
tlsched:
	tasklet_schedule(&dev->tl);
}

static void write_bulk_callback(struct urb *urb)
{
	rtl8150_t *dev;

	dev = urb->context;
	if (!dev)
		return;
	dev_kfree_skb_irq(dev->tx_skb);
	if (!netif_device_present(dev->netdev))
		return;
	if (urb->status)
		info("%s: Tx status %d", dev->netdev->name, urb->status);
	dev->netdev->trans_start = jiffies;
	netif_wake_queue(dev->netdev);
}

void intr_callback(struct urb *urb)
{
	rtl8150_t *dev;

	dev = urb->context;
	if (!dev)
		return;
	switch (urb->status) {
	case 0:
		break;
	case -ENOENT:
		return;
	default:
		info("%s: intr status %d", dev->netdev->name, urb->status);
	}
}

/*