path: root/drivers/net/sk_mca.c

/*
net-3-driver for the SKNET MCA-based cards

This is an extension to the Linux operating system, and is covered by the
same GNU General Public License that covers that work.

Copyright 1999 by Alfred Arnold (alfred@ccac.rwth-aachen.de,
                                 alfred.arnold@lancom.de)

This driver is based both on the 3C523 driver and the SK_G16 driver.

paper sources:
  'PC Hardware: Aufbau, Funktionsweise, Programmierung' by
  Hans-Peter Messmer for the basic Microchannel stuff

  'Linux Geraetetreiber' by Allesandro Rubini, Kalle Dalheimer
  for help on Ethernet driver programming

  'Ethernet/IEEE 802.3 Family 1992 World Network Data Book/Handbook' by AMD
  for documentation on the AM7990 LANCE

  'SKNET Personal Technisches Manual', Version 1.2 by Schneider&Koch
  for documentation on the Junior board

  'SK-NET MC2+ Technical Manual", Version 1.1 by Schneider&Koch for
  documentation on the MC2 bord

  A big thank you to the S&K support for providing me so quickly with
  documentation!

  Also see http://www.syskonnect.com/

  Missing things:

  -> set debug level via ioctl instead of compile-time switches
  -> I didn't follow the development of the 2.1.x kernels, so my
     assumptions about which things changed with which kernel version
     are probably nonsense

History:
  May 16th, 1999
  	startup
  May 22st, 1999
	added private structure, methods
        begun building data structures in RAM
  May 23nd, 1999
	can receive frames, send frames
  May 24th, 1999
        modularized initialization of LANCE
        loadable as module
	still Tx problem :-(
  May 26th, 1999
  	MC2 works
  	support for multiple devices
  	display media type for MC2+
  May 28th, 1999
	fixed problem in GetLANCE leaving interrupts turned off
        increase TX queue to 4 packets to improve send performance
  May 29th, 1999
	a few corrections in statistics, caught rcvr overruns
        reinitialization of LANCE/board in critical situations
        MCA info implemented
	implemented LANCE multicast filter
  Jun 6th, 1999
	additions for Linux 2.2
  Dec 25th, 1999
  	unfortunately there seem to be newer MC2+ boards that react
  	on IRQ 3/5/9/10 instead of 3/5/10/11, so we have to autoprobe
  	in questionable cases...
  Dec 28th, 1999
	integrated patches from David Weinehall & Bill Wendling for 2.3
	kernels (isa_...functions).  Things are defined in a way that
        it still works with 2.0.x 8-)
  Dec 30th, 1999
	added handling of the remaining interrupt conditions.  That
        should cure the spurious hangs.
  Jan 30th, 2000
	newer kernels automatically probe more than one board, so the
	'startslot' as a variable is also needed here
  June 1st, 2000
	added changes for recent 2.3 kernels

 *************************************************************************/

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/mca-legacy.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>

#include <asm/processor.h>
#include <asm/io.h>

#define _SK_MCA_DRIVER_
#include "sk_mca.h"

/* ------------------------------------------------------------------------
 * global static data - not more since we can handle multiple boards and
 * have to pack all state info into the device struct!
 * ------------------------------------------------------------------------ */

static char *MediaNames[Media_Count] =
    { "10Base2", "10BaseT", "10Base5", "Unknown" };

static unsigned char poly[] =
    { 1, 1, 1, 0, 1, 1, 0, 1, 1, 0, 1, 1, 1, 0, 0, 0,
	1, 0, 0, 0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0
};

/* ------------------------------------------------------------------------
 * private subfunctions
 * ------------------------------------------------------------------------ */

/* dump parts of shared memory - only needed during debugging */

#ifdef DEBUG
static void dumpmem(struct net_device *dev, u32 start, u32 len)
{
	skmca_priv *priv = netdev_priv(dev);
	int z;

	for (z = 0; z < len; z++) {
		if ((z & 15) == 0)
			printk("%04x:", z);
		printk(" %02x", readb(priv->base + start + z));
		if ((z & 15) == 15)
			printk("\n");
	}
}

/* print exact time - ditto */

static void PrTime(void)
{
	struct timeval tv;

	do_gettimeofday(&tv);
	printk("%9d:%06d: ", tv.tv_sec, tv.tv_usec);
}
#endif

/* deduce resources out of POS registers */

static void __