path: root/drivers/net/lp486e.c

/* Intel Professional Workstation/panther ethernet driver */
/* lp486e.c: A panther 82596 ethernet driver for linux. */
/*
    History and copyrights:

    Driver skeleton
        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 author may be reached as becker@scyld.com, or C/O
	Scyld Computing Corporation
	410 Severn Ave., Suite 210
	Annapolis MD 21403

    Apricot
        Written 1994 by Mark Evans.
        This driver is for the Apricot 82596 bus-master interface

        Modularised 12/94 Mark Evans

    Professional Workstation
	Derived from apricot.c by Ard van Breemen
	<ard@murphy.nl>|<ard@cstmel.hobby.nl>|<ard@cstmel.nl.eu.org>

	Credits:
	Thanks to Murphy Software BV for letting me write this in their time.
	Well, actually, I get payed doing this...
	(Also: see http://www.murphy.nl for murphy, and my homepage ~ard for
	more information on the Professional Workstation)

    Present version
	aeb@cwi.nl
*/
/*
    There are currently two motherboards that I know of in the
    professional workstation. The only one that I know is the
    intel panther motherboard. -- ard
*/
/*
The pws is equipped with an intel 82596. This is a very intelligent controller
which runs its own micro-code. Communication with the hostprocessor is done
through linked lists of commands and buffers in the hostprocessors memory.
A complete description of the 82596 is available from intel. Search for
a file called "29021806.pdf". It is a complete description of the chip itself.
To use it for the pws some additions are needed regarding generation of
the PORT and CA signal, and the interrupt glue needed for a pc.
I/O map:
PORT  SIZE ACTION MEANING
0xCB0    2 WRITE  Lower 16 bits for PORT command
0xCB2    2 WRITE  Upper 16 bits for PORT command, and issue of PORT command
0xCB4    1 WRITE  Generation of CA signal
0xCB8    1 WRITE  Clear interrupt glue
All other communication is through memory!
*/

#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#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/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/bitops.h>

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

#define DRV_NAME "lp486e"

/* debug print flags */
#define LOG_SRCDST    0x80000000
#define LOG_STATINT   0x40000000
#define LOG_STARTINT  0x20000000

#define i596_debug debug

static int i596_debug = 0;

static const char * const medianame[] = {
	"10baseT", "AUI",
	"10baseT-FD", "AUI-FD",
};

#define LP486E_TOTAL_SIZE 16

#define I596_NULL (0xffffffff)

#define CMD_EOL		0x8000	/* The last command of the list, stop. */
#define CMD_SUSP	0x4000	/* Suspend after doing cmd. */
#define CMD_INTR	0x2000	/* Interrupt after doing cmd. */

#define CMD_FLEX	0x0008	/* Enable flexible memory model */

enum commands {
	CmdNOP = 0,
	CmdIASetup = 1,
	CmdConfigure = 2,
	CmdMulticastList = 3,
	CmdTx = 4,
	CmdTDR = 5,
	CmdDump = 6,
	CmdDiagnose = 7
};

#if 0
static const char *CUcmdnames[8] = { "NOP", "IASetup", "Configure", "MulticastList",
				     "Tx", "TDR", "Dump", "Diagnose" };
#endif

/* Status word bits */
#define	STAT_CX		0x8000	/* The CU finished executing a command
				   with the Interrupt bit set */
#define	STAT_FR		0x4000	/* The RU finished receiving a frame */
#define	STAT_CNA	0x2000	/* The CU left the active state */
#define	STAT_RNR	0x1000	/* The RU left the active state */
#define STAT_ACK	(STAT_CX | STAT_FR | STAT_CNA | STAT_RNR)
#define	STAT_CUS	0x0700	/* Status of CU: 0: idle, 1: suspended,
				   2: active, 3-7: unused */
#define STAT_RUS	0x00f0	/* Status of RU: 0: idle, 1: suspended,
				   2: no resources, 4: ready,
				   10: no resources due to no more RBDs,
				   12: no more RBDs, other: unused */
#define	STAT_T		0x0008	/* Bus throttle timers loaded */
#define	STAT_ZERO	0x0807	/* Always zero */

#if 0
static char *CUstates[8] = {
	"idle", "suspended", "active", 0, 0, 0, 0, 0
};
static char *RUstates[16] = {
	"idle", "suspended", "no resources", 0, "ready", 0, 0, 0,
	0, 0, "no RBDs", 0, "out of RBDs", 0, 0, 0
};

static void
i596_out_status(int status) {
	int bad = 0;
	char *s;

	printk("status %4.4x:", status);
	if (status == 0xffff)
		printk(" strange..\n");
	else {
		if (status & STAT_CX)