catc.c

基于S3CEB2410平台LINUX操作系统下 USB驱动源代码

/*
 *  Copyright (c) 2001 Vojtech Pavlik
 *
 *  CATC EL1210A NetMate USB Ethernet driver
 *
 *  Sponsored by SuSE
 *
 *  Based on the work of
 *		Donald Becker
 */

/*
 * 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
 * 
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <[e-mail]>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <asm/bitops.h>

#undef DEBUG

#include <linux/usb.h>

/*
 * Version information.
 */

#define DRIVER_VERSION "v2.7"
#define DRIVER_AUTHOR "Vojtech Pavlik <[e-mail]>"
#define DRIVER_DESC "CATC EL1210A NetMate USB Ethernet driver"

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Some defines.
 */ 

#define STATS_UPDATE		(HZ)	/* Time between stats updates */
#define TX_TIMEOUT		(5*HZ)	/* Max time the queue can be stopped */
#define PKT_SZ			1536	/* Max Ethernet packet size */
#define RX_MAX_BURST		15	/* Max packets per rx buffer (> 0, < 16) */
#define TX_MAX_BURST		15	/* Max full sized packets per tx buffer (> 0) */
#define CTRL_QUEUE		16	/* Max control requests in flight (power of two) */

/*
 * Control requests.
 */

enum control_requests {
	ReadMem =	0xf1,
	GetMac =	0xf2,
	Reset =		0xf4,
	SetMac =	0xf5,
	WriteROM =	0xf8,
	SetReg =	0xfa,
	GetReg =	0xfb,
	WriteMem =	0xfc,
	ReadROM =	0xfd,
};

/*
 * Registers.
 */

enum register_offsets {
	TxBufCount =	0x20,
	RxBufCount =	0x21,
	OpModes =	0x22,
	TxQed =		0x23,
	RxQed =		0x24,
	MaxBurst =	0x25,
	RxUnit =	0x60,
	EthStatus =	0x61,
	StationAddr0 =	0x67,
	EthStats =	0x69,
	LEDCtrl =	0x81,
};

enum eth_stats {
	TxSingleColl =	0x00,
        TxMultiColl =	0x02,
        TxExcessColl =	0x04,
        RxFramErr =	0x06,
};

enum op_mode_bits {
	Op3MemWaits =	0x03,
	OpLenInclude =	0x08,
	OpRxMerge =	0x10,
	OpTxMerge =	0x20,
	OpWin95bugfix =	0x40,
	OpLoopback =	0x80,
};

enum rx_filter_bits {
	RxEnable =	0x01,
	RxPolarity =	0x02,
	RxForceOK =	0x04,
	RxMultiCast =	0x08,
	RxPromisc =	0x10,
};

enum led_values {
	LEDFast = 	0x01,
	LEDSlow =	0x02,
	LEDFlash =	0x03,
	LEDPulse =	0x04,
	LEDLink =	0x08,
};

/*
 * The catc struct.
 */

#define CTRL_RUNNING	0
#define RX_RUNNING	1
#define TX_RUNNING	2

struct catc {
	struct net_device *netdev;
	struct usb_device *usbdev;

	struct net_device_stats stats;
	unsigned long flags;

	unsigned int tx_ptr, tx_idx;
	unsigned int ctrl_head, ctrl_tail;
	spinlock_t tx_lock, ctrl_lock;

	u8 tx_buf[2][TX_MAX_BURST * (PKT_SZ + 2)];
	u8 rx_buf[RX_MAX_BURST * (PKT_SZ + 2)];
	u8 irq_buf[2];
	u8 ctrl_buf[64];
	devrequest ctrl_dr;

	struct timer_list timer;
	u8 stats_buf[8];
	u16 stats_vals[4];
	unsigned long last_stats;

	u8 multicast[64];

	struct ctrl_queue {
		u8 dir;
		u8 request;
		u16 value;
		u16 index;
		void *buf;
		int len;
		void (*callback)(struct catc *catc, struct ctrl_queue *q);
	} ctrl_queue[CTRL_QUEUE];

	struct urb tx_urb, rx_urb, irq_urb, ctrl_urb;
};

/*
 * Useful macros.
 */

#define catc_get_mac(catc, mac)				catc_ctrl_msg(catc, USB_DIR_IN,  GetMac, 0, 0, mac,  6)
#define catc_reset(catc)				catc_ctrl_msg(catc, USB_DIR_OUT, Reset, 0, 0, NULL, 0)
#define catc_set_reg(catc, reg, val)			catc_ctrl_msg(catc, USB_DIR_OUT, SetReg, val, reg, NULL, 0)
#define catc_get_reg(catc, reg, buf)			catc_ctrl_msg(catc, USB_DIR_IN,  GetReg, 0, reg, buf, 1)
#define catc_write_mem(catc, addr, buf, size)		catc_ctrl_msg(catc, USB_DIR_OUT, WriteMem, 0, addr, buf, size)
#define catc_read_mem(catc, addr, buf, size)		catc_ctrl_msg(catc, USB_DIR_IN,  ReadMem, 0, addr, buf, size)

#define catc_set_reg_async(catc, reg, val)		catc_ctrl_async(catc, USB_DIR_OUT, SetReg, val, reg, NULL, 0, NULL)
#define catc_get_reg_async(catc, reg, cb)		catc_ctrl_async(catc, USB_DIR_IN, GetReg, 0, reg, NULL, 1, cb)
#define catc_write_mem_async(catc, addr, buf, size)	catc_ctrl_async(catc, USB_DIR_OUT, WriteMem, 0, addr, buf, size, NULL)

/*
 * Receive routines.
 */

static void catc_rx_done(struct urb *urb)
{
	struct catc *catc = urb->context;
	u8 *pkt_start = urb->transfer_buffer;
	struct sk_buff *skb;
	int pkt_len;

	clear_bit(RX_RUNNING, &catc->flags);

	if (urb->status) {
		dbg("rx_done, status %d, length %d", urb->status, urb->actual_length);
		return;
	}

	do {
		pkt_len = le16_to_cpup((u16*)pkt_start);

		if (pkt_len > urb->actual_length) {
			catc->stats.rx_length_errors++;
			catc->stats.rx_errors++;
			break;
		}

		if (!(skb = dev_alloc_skb(pkt_len)))
			return;

		skb->dev = catc->netdev;
		eth_copy_and_sum(skb, pkt_start + 2, pkt_len, 0);
		skb_put(skb, pkt_len);

		skb->protocol = eth_type_trans(skb, catc->netdev);
		netif_rx(skb);

		catc->stats.rx_packets++;
		catc->stats.rx_bytes += pkt_len;

		pkt_start += (((pkt_len + 1) >> 6) + 1) << 6;

	} while (pkt_start - (u8 *) urb->transfer_buffer < urb->actual_length);

	catc->netdev->last_rx = jiffies;
}

static void catc_irq_done(struct urb *urb)
{
	struct catc *catc = urb->context;
	u8 *data = urb->transfer_buffer;
	int status;

	if (urb->status) {
		dbg("irq_done, status %d, data %02x %02x.", urb->status, data[0], data[1]);
		return;
	}

	if ((data[1] & 0x80) && !test_and_set_bit(RX_RUNNING, &catc->flags)) {
		catc->rx_urb.dev = catc->usbdev;
		if ((status = usb_submit_urb(&catc->rx_urb)) < 0) {
			err("submit(rx_urb) status %d", status);
			return;
		} 
	}

	if (data[1] & 0x40)
		dbg("link ok");

	if (data[1] & 0x20) 
		dbg("link bad");
}

/*
 * Transmit routines.
 */

static void catc_tx_run(struct catc *catc)
{
	int status;

	catc->tx_urb.transfer_buffer_length = catc->tx_ptr;
	catc->tx_urb.transfer_buffer = catc->tx_buf[catc->tx_idx];
	catc->tx_urb.dev = catc->usbdev;

	if ((status = usb_submit_urb(&catc->tx_urb)) < 0)
		err("submit(tx_urb), status %d", status);

	catc->tx_idx = !catc->tx_idx;
	catc->tx_ptr = 0;

	catc->netdev->trans_start = jiffies;
}

static void catc_tx_done(struct urb *urb)
{
	struct catc *catc = urb->context;
	unsigned long flags;

	if (urb->status == -ECONNRESET) {
		dbg("Tx Reset.");
		urb->transfer_flags &= ~USB_ASYNC_UNLINK;
		urb->status = 0;
		catc->netdev->trans_start = jiffies;
		catc->stats.tx_errors++;
		clear_bit(TX_RUNNING, &catc->flags);
		netif_wake_queue(catc->netdev);
		return;
	}

	if (urb->status) {
		dbg("tx_done, status %d, length %d", urb->status, urb->actual_length);
		return;
	}

	spin_lock_irqsave(&catc->tx_lock, flags);

	if (catc->tx_ptr)
		catc_tx_run(catc);
	else
		clear_bit(TX_RUNNING, &catc->flags);

	netif_wake_queue(catc->netdev);

	spin_unlock_irqrestore(&catc->tx_lock, flags);
}

static int catc_hard_start_xmit(struct sk_buff *skb, struct net_device *netdev)
{
	struct catc *catc = netdev->priv;
	unsigned long flags;
	char *tx_buf;

	spin_lock_irqsave(&catc->tx_lock, flags);

	catc->tx_ptr = (((catc->tx_ptr - 1) >> 6) + 1) << 6;
	tx_buf = catc->tx_buf[catc->tx_idx] + catc->tx_ptr;
	*((u16*)tx_buf) = cpu_to_le16((u16)skb->len);
	memcpy(tx_buf + 2, skb->data, skb->len);
	catc->tx_ptr += skb->len + 2;

	if (!test_and_set_bit(TX_RUNNING, &catc->flags))
		catc_tx_run(catc);

	if (catc->tx_ptr >= ((TX_MAX_BURST - 1) * (PKT_SZ + 2)))
		netif_stop_queue(netdev);

	spin_unlock_irqrestore(&catc->tx_lock, flags);

	catc->stats.tx_bytes += skb->len;
	catc->stats.tx_packets++;

	dev_kfree_skb(skb);

	return 0;
}

static void catc_tx_timeout(struct net_device *netdev)
{
	struct catc *catc = netdev->priv;

	warn("Transmit timed out.");
	catc->tx_urb.transfer_flags |= USB_ASYNC_UNLINK;
	usb_unlink_urb(&catc->tx_urb);
}

/*
 * Control messages.
 */

static int catc_ctrl_msg(struct catc *catc, u8 dir, u8 request, u16 value, u16 index, void *buf, int len)
{
        int retval = usb_control_msg(catc->usbdev,
		dir ? usb_rcvctrlpipe(catc->usbdev, 0) : usb_sndctrlpipe(catc->usbdev, 0),
		 request, 0x40 | dir, value, index, buf, len, HZ);
        return retval < 0 ? retval : 0;
}

static void catc_ctrl_run(struct catc *catc)
{
	struct ctrl_queue *q = catc->ctrl_queue + catc->ctrl_tail;
	struct usb_device *usbdev = catc->usbdev;
	struct urb *urb = &catc->ctrl_urb;
	devrequest *dr = &catc->ctrl_dr;
	int status;