path: root/drivers/net/arcnet/arcnet.c

/*
 * Linux ARCnet driver - device-independent routines
 * 
 * Written 1997 by David Woodhouse.
 * Written 1994-1999 by Avery Pennarun.
 * Written 1999-2000 by Martin Mares <mj@ucw.cz>.
 * Derived from skeleton.c by Donald Becker.
 *
 * Special thanks to Contemporary Controls, Inc. (www.ccontrols.com)
 *  for sponsoring the further development of this driver.
 *
 * **********************
 *
 * The original copyright was as follows:
 *
 * skeleton.c Written 1993 by Donald Becker.
 * Copyright 1993 United States Government as represented by the
 * Director, National Security Agency.  This software may only be used
 * and distributed according to the terms of the GNU General Public License as
 * modified by SRC, incorporated herein by reference.
 *
 * **********************
 * 
 * The change log is now in a file called ChangeLog in this directory.
 *
 * Sources:
 *  - Crynwr arcnet.com/arcether.com packet drivers.
 *  - arcnet.c v0.00 dated 1/1/94 and apparently by 
 *     Donald Becker - it didn't work :)
 *  - skeleton.c v0.05 dated 11/16/93 by Donald Becker
 *     (from Linux Kernel 1.1.45)
 *  - RFC's 1201 and 1051 - re: TCP/IP over ARCnet
 *  - The official ARCnet COM9026 data sheets (!) thanks to
 *     Ken Cornetet <kcornete@nyx10.cs.du.edu>
 *  - The official ARCnet COM20020 data sheets.
 *  - Information on some more obscure ARCnet controller chips, thanks
 *     to the nice people at SMSC.
 *  - net/inet/eth.c (from kernel 1.1.50) for header-building info.
 *  - Alternate Linux ARCnet source by V.Shergin <vsher@sao.stavropol.su>
 *  - Textual information and more alternate source from Joachim Koenig
 *     <jojo@repas.de>
 */

#define VERSION "arcnet: v3.94 BETA 2007/02/08 - by Avery Pennarun et al.\n"

#include <linux/module.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <net/arp.h>
#include <linux/init.h>
#include <linux/arcdevice.h>
#include <linux/jiffies.h>

/* "do nothing" functions for protocol drivers */
static void null_rx(struct net_device *dev, int bufnum,
		    struct archdr *pkthdr, int length);
static int null_build_header(struct sk_buff *skb, struct net_device *dev,
			     unsigned short type, uint8_t daddr);
static int null_prepare_tx(struct net_device *dev, struct archdr *pkt,
			   int length, int bufnum);

static void arcnet_rx(struct net_device *dev, int bufnum);

/*
 * one ArcProto per possible proto ID.  None of the elements of
 * arc_proto_map are allowed to be NULL; they will get set to
 * arc_proto_default instead.  It also must not be NULL; if you would like
 * to set it to NULL, set it to &arc_proto_null instead.
 */
 struct ArcProto *arc_proto_map[256], *arc_proto_default,
   *arc_bcast_proto, *arc_raw_proto;

static struct ArcProto arc_proto_null =
{
	.suffix		= '?',
	.mtu		= XMTU,
	.is_ip          = 0,
	.rx		= null_rx,
	.build_header	= null_build_header,
	.prepare_tx	= null_prepare_tx,
	.continue_tx    = NULL,
	.ack_tx         = NULL
};

/* Exported function prototypes */
int arcnet_debug = ARCNET_DEBUG;

EXPORT_SYMBOL(arc_proto_map);
EXPORT_SYMBOL(arc_proto_default);
EXPORT_SYMBOL(arc_bcast_proto);
EXPORT_SYMBOL(arc_raw_proto);
EXPORT_SYMBOL(arcnet_unregister_proto);
EXPORT_SYMBOL(arcnet_debug);
EXPORT_SYMBOL(alloc_arcdev);
EXPORT_SYMBOL(arcnet_interrupt);
EXPORT_SYMBOL(arcnet_open);
EXPORT_SYMBOL(arcnet_close);
EXPORT_SYMBOL(arcnet_send_packet);
EXPORT_SYMBOL(arcnet_timeout);

/* Internal function prototypes */
static int arcnet_header(struct sk_buff *skb, struct net_device *dev,
			 unsigned short type, const void *daddr,
			 const void *saddr, unsigned len);
static int arcnet_rebuild_header(struct sk_buff *skb);
static int go_tx(struct net_device *dev);

static int debug = ARCNET_DEBUG;
module_param(debug, int, 0);
MODULE_LICENSE("GPL");

static int __init arcnet_init(void)
{
	int count;

	arcnet_debug = debug;

	printk("arcnet loaded.\n");

#ifdef ALPHA_WARNING
	BUGLVL(D_EXTRA) {
		printk("arcnet: ***\n"
		"arcnet: * Read arcnet.txt for important release notes!\n"
		       "arcnet: *\n"
		       "arcnet: * This is an ALPHA version! (Last stable release: v3.02)  E-mail\n"
		       "arcnet: * me if you have any questions, comments, or bug reports.\n"
		       "arcnet: ***\n");
	}
#endif

	/* initialize the protocol map */
	arc_raw_proto = arc_proto_default = arc_bcast_proto = &arc_proto_null;
	for (count = 0; count < 256; count++)
		arc_proto_map[count] = arc_proto_default;

	BUGLVL(D_DURING)
	    printk("arcnet: struct sizes: %Zd %Zd %Zd %Zd %Zd\n",
		 sizeof(struct arc_hardware), sizeof(struct arc_rfc1201),
		sizeof(struct arc_rfc1051), sizeof(struct arc_eth_encap),
		   sizeof(struct archdr));

	return 0;
}

static void __exit