drivers/net/dgrs.c



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/*
 *	Digi RightSwitch SE-X loadable device driver for Linux
 *
 *	The RightSwitch is a 4 (EISA) or 6 (PCI) port etherswitch and
 *	a NIC on an internal board.
 *
 *	Author: Rick Richardson, rick@remotepoint.com
 *	Derived from the SVR4.2 (UnixWare) driver for the same card.
 *
 *	Copyright 1995-1996 Digi International Inc.
 *
 *	This software may be used and distributed according to the terms
 *	of the GNU General Public License, incorporated herein by reference.
 *
 *	For information on purchasing a RightSwitch SE-4 or SE-6
 *	board, please contact Digi's sales department at 1-612-912-3444
 *	or 1-800-DIGIBRD.  Outside the U.S., please check our Web page
 *	at http://www.dgii.com for sales offices worldwide.
 *
 *	OPERATION:
 *	When compiled as a loadable module, this driver can operate
 *	the board as either a 4/6 port switch with a 5th or 7th port
 *	that is a conventional NIC interface as far as the host is
 *	concerned, OR as 4/6 independent NICs.  To select multi-NIC
 *	mode, add "nicmode=1" on the insmod load line for the driver.
 *
 *	This driver uses the "dev" common ethernet device structure
 *	and a private "priv" (dev->priv) structure that contains
 *	mostly DGRS-specific information and statistics.  To keep
 *	the code for both the switch mode and the multi-NIC mode
 *	as similar as possible, I have introduced the concept of
 *	"dev0"/"priv0" and "devN"/"privN"  pointer pairs in subroutines
 *	where needed.  The first pair of pointers points to the
 *	"dev" and "priv" structures of the zeroth (0th) device
 *	interface associated with a board.  The second pair of
 *	pointers points to the current (Nth) device interface
 *	for the board: the one for which we are processing data.
 *
 *	In switch mode, the pairs of pointers are always the same,
 *	that is, dev0 == devN and priv0 == privN.  This is just
 *	like previous releases of this driver which did not support
 *	NIC mode.
 *
 *	In multi-NIC mode, the pairs of pointers may be different.
 *	We use the devN and privN pointers to reference just the
 *	name, port number, and statistics for the current interface.
 *	We use the dev0 and priv0 pointers to access the variables
 *	that control access to the board, such as board address
 *	and simulated 82596 variables.  This is because there is
 *	only one "fake" 82596 that serves as the interface to
 *	the board.  We do not want to try to keep the variables
 *	associated with this 82596 in sync across all devices.
 *
 *	This scheme works well.  As you will see, except for
 *	initialization, there is very little difference between
 *	the two modes as far as this driver is concerned.  On the
 *	receive side in NIC mode, the interrupt *always* comes in on
 *	the 0th interface (dev0/priv0).  We then figure out which
 *	real 82596 port it came in on from looking at the "chan"
 *	member that the board firmware adds at the end of each
 *	RBD (a.k.a. TBD). We get the channel number like this:
 *		int chan = ((I596_RBD *) S2H(cbp->xmit.tbdp))->chan;
 *
 *	On the transmit side in multi-NIC mode, we specify the
 *	output 82596 port by setting the new "dstchan" structure
 *	member that is at the end of the RFD, like this:
 *		priv0->rfdp->dstchan = privN->chan;
 *
 *	TODO:
 *	- Multi-NIC mode is not yet supported when the driver is linked
 *	  into the kernel.
 *	- Better handling of multicast addresses.
 *
 *	Fixes:
 *	Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 11/01/2001
 *	- fix dgrs_found_device wrt checking kmalloc return and
 *	rollbacking the partial steps of the whole process when
 *	one of the devices can't be allocated. Fix SET_MODULE_OWNER
 *	on the loop to use devN instead of repeated calls to dev.
 *
 *	davej <davej@suse.de> - 9/2/2001
 *	- Enable PCI device before reading ioaddr/irq
 *
 */

#include <linux/module.h>
#include <linux/eisa.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>

#include <asm/io.h>
#include <asm/byteorder.h>
#include <asm/uaccess.h>

static char version[] __initdata =
	"$Id: dgrs.c,v 1.13 2000/06/06 04:07:00 rick Exp $";

/*
 *	DGRS include files
 */
typedef unsigned char uchar;
#define vol volatile

#include "dgrs.h"
#include "dgrs_es4h.h"
#include "dgrs_plx9060.h"
#include "dgrs_i82596.h"
#include "dgrs_ether.h"
#include "dgrs_asstruct.h"
#include "dgrs_bcomm.h"

#ifdef CONFIG_PCI
static struct pci_device_id dgrs_pci_tbl[] = {
	{ SE6_PCI_VENDOR_ID, SE6_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID, },
	{ }			/* Terminating entry */
};
MODULE_DEVICE_TABLE(pci, dgrs_pci_tbl);
#endif