path: root/drivers/net/wan/sbni.c

/* sbni.c:  Granch SBNI12 leased line adapters driver for linux
 *
 *	Written 2001 by Denis I.Timofeev (timofeev@granch.ru)
 *
 *	Previous versions were written by Yaroslav Polyakov,
 *	Alexey Zverev and Max Khon.
 *
 *	Driver supports SBNI12-02,-04,-05,-10,-11 cards, single and
 *	double-channel, PCI and ISA modifications.
 *	More info and useful utilities to work with SBNI12 cards you can find
 *	at http://www.granch.com (English) or http://www.granch.ru (Russian)
 *
 *	This software may be used and distributed according to the terms
 *	of the GNU General Public License.
 *
 *
 *  5.0.1	Jun 22 2001
 *	  - Fixed bug in probe
 *  5.0.0	Jun 06 2001
 *	  - Driver was completely redesigned by Denis I.Timofeev,
 *	  - now PCI/Dual, ISA/Dual (with single interrupt line) models are
 *	  - supported
 *  3.3.0	Thu Feb 24 21:30:28 NOVT 2000 
 *        - PCI cards support
 *  3.2.0	Mon Dec 13 22:26:53 NOVT 1999
 * 	  - Completely rebuilt all the packet storage system
 * 	  -    to work in Ethernet-like style.
 *  3.1.1	just fixed some bugs (5 aug 1999)
 *  3.1.0	added balancing feature	(26 apr 1999)
 *  3.0.1	just fixed some bugs (14 apr 1999).
 *  3.0.0	Initial Revision, Yaroslav Polyakov (24 Feb 1999)
 *        - added pre-calculation for CRC, fixed bug with "len-2" frames, 
 *        - removed outbound fragmentation (MTU=1000), written CRC-calculation 
 *        - on asm, added work with hard_headers and now we have our own cache 
 *        - for them, optionally supported word-interchange on some chipsets,
 * 
 *	Known problem: this driver wasn't tested on multiprocessor machine.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ptrace.h>
#include <linux/fcntl.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/pci.h>
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/init.h>
#include <linux/delay.h>

#include <net/net_namespace.h>
#include <net/arp.h>
#include <net/Space.h>

#include <asm/io.h>
#include <asm/types.h>
#include <asm/byteorder.h>
#include <asm/irq.h>
#include <linux/uaccess.h>

#include "sbni.h"

/* device private data */

struct net_local {
	struct timer_list	watchdog;
	struct net_device	*watchdog_dev;

	spinlock_t	lock;
	struct sk_buff  *rx_buf_p;		/* receive buffer ptr */
	struct sk_buff  *tx_buf_p;		/* transmit buffer ptr */
	
	unsigned int	framelen;		/* current frame length */
	unsigned int	maxframe;		/* maximum valid frame length */
	unsigned int	state;
	unsigned int	inppos, outpos;		/* positions in rx/tx buffers */

	/* transmitting frame number - from frames qty to 1 */
	unsigned int	tx_frameno;

	/* expected number of next receiving frame */
	unsigned int	wait_frameno;

	/* count of failed attempts to frame send - 32 attempts do before
	   error - while receiver tunes on opposite side of wire */
	unsigned int	trans_errors;

	/* idle time; send pong when limit exceeded */
	unsigned int	timer_ticks;

	/* fields used for receive level autoselection */
	int	delta_rxl;
	unsigned int	cur_rxl_index, timeout_rxl;
	unsigned long	cur_rxl_rcvd, prev_rxl_rcvd;

	struct sbni_csr1	csr1;		/* current value of CSR1 */
	struct sbni_in_stats	in_stats; 	/* internal statistics */ 

	struct net_device		*second;	/* for ISA/dual cards */

#ifdef CONFIG_SBNI_MULTILINE
	struct net_device		*master;
	struct net_device		*link;
#endif
};


static int  sbni_card_probe( unsigned long );
static int  sbni_pci_probe( struct net_device  * );
static struct net_device  *sbni_probe1(struct net_device *, unsigned long, int);
static int  sbni_open( struct net_device * );
static int  sbni_close( struct net_device * );
static netdev_tx_t sbni_start_xmit(struct sk_buff *,
					 struct net_device * );
static int  sbni_ioctl( struct net_device *, struct ifreq *, int );
static void  set_multicast_list( struct