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	The LITMUS^RT kernel.	Bjoern Brandenburg

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/* at1700.c: A network device driver for  the Allied Telesis AT1700.

	Written 1993-98 by Donald Becker.

	Copyright 1993 United States Government as represented by the
	Director, National Security Agency.

	This software may be used and distributed according to the terms
	of the GNU General Public License, 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

	This is a device driver for the Allied Telesis AT1700, and
        Fujitsu FMV-181/182/181A/182A/183/184/183A/184A, which are
	straight-forward Fujitsu MB86965 implementations.

	Modification for Fujitsu FMV-18X cards is done by Yutaka Tamiya
	(tamy@flab.fujitsu.co.jp).

  Sources:
    The Fujitsu MB86965 datasheet.

	After the initial version of this driver was written Gerry Sawkins of
	ATI provided their EEPROM configuration code header file.
    Thanks to NIIBE Yutaka <gniibe@mri.co.jp> for bug fixes.

    MCA bus (AT1720) support by Rene Schmit <rene@bss.lu>

  Bugs:
	The MB86965 has a design flaw that makes all probes unreliable.  Not
	only is it difficult to detect, it also moves around in I/O space in
	response to inb()s from other device probes!
*/

#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/mca-legacy.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/crc32.h>
#include <linux/bitops.h>

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

static char version[] __initdata =
	"at1700.c:v1.16 9/11/06  Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";

#define DRV_NAME "at1700"

/* Tunable parameters. */

/* When to switch from the 64-entry multicast filter to Rx-all-multicast. */
#define MC_FILTERBREAK 64

/* These unusual address orders are used to verify the CONFIG register. */

static int fmv18x_probe_list[] __initdata = {
	0x220, 0x240, 0x260, 0x280, 0x2a0, 0x2c0, 0x300, 0x340, 0
};

/*
 *	ISA
 */

static unsigned at1700_probe_list[] __initdata = {
	0x260, 0x280, 0x2a0, 0x240, 0x340, 0x320, 0x380, 0x300, 0
};

/*
 *	MCA
 */
#ifdef CONFIG_MCA_LEGACY
static int at1700_ioaddr_pattern[] __initdata = {
	0x00, 0x04, 0x01, 0x05, 0x02, 0x06, 0x03, 0x07
};

static int at1700_mca_probe_list[] __initdata = {
	0x400, 0x1400, 0x2400, 0x3400, 0x4400, 0x5400, 0x6400, 0x7400, 0
};

static int at1700_irq_pattern[] __initdata = {
	0x00, 0x00, 0x00, 0x30, 0x70, 0xb0, 0x00, 0x00,
	0x00, 0xf0, 0x34, 0x74, 0xb4, 0x00, 0x00, 0xf4, 0x00
};
#endif

/* use 0 for production, 1 for verification, >2 for debug */
#ifndef NET_DEBUG
#define NET_DEBUG 1
#endif
static unsigned int net_debug = NET_DEBUG;

typedef unsigned char uchar;

/* Information that need to be kept for each board. */
struct net_local {
	struct net_device_stats stats;
	spinlock_t lock;
	unsigned char mc_filter[8];
	uint jumpered:1;			/* Set iff the board has jumper config. */
	uint tx_started:1;			/* Packets are on the Tx queue. */
	uint tx_queue_ready:1;			/* Tx queue is ready to be sent. */
	uint rx_started:1;			/* Packets are Rxing. */
	uchar tx_queue;				/* Number of packet on the Tx queue. */
	char mca_slot;				/* -1 means ISA */
	ushort tx_queue_len;			/* Current length of the Tx queue. */
};


/* Offsets from the base address. */
#define STATUS			0
#define TX_STATUS		0
#define RX_STATUS		1
#define TX_INTR			2		/* Bit-mapped interrupt enable registers. */
#define RX_INTR			3
#define TX_MODE			4
#define RX_MODE			5
#define CONFIG_0		6		/* Misc. configuration settings. */
#define CONFIG_1		7
/* Run-time register bank 2 definitions. */
#define DATAPORT		8		/* Word-wide DMA or programmed-I/O dataport. */
#define TX_START		10
#define COL16CNTL		11		/* Controll Reg for 16 collisions */
#define MODE13			13
#define RX_CTRL			14
/* Configuration registers only on the '865A/B chips. */
#define EEPROM_Ctrl 	16
#define EEPROM_Data 	17
#define CARDSTATUS	16			/* FMV-18x Card Status */
#define CARDSTATUS1	17			/* FMV-18x Card Status */
#define IOCONFIG		18		/* Either read the jumper, or move the I/O. */
#define IOCONFIG1		19
#define	SAPROM			20		/* The station address PROM, if no EEPROM. */
#define MODE24			24
#define RESET			31		/* Write to reset some parts of the chip. */
#define AT1700_IO_EXTENT	32
#define PORT_OFFSET(o) (o)


#define TX_TIMEOUT		10


/* Index to functions, as function prototypes. */

static int at1700_probe1(struct net_device *dev, int ioaddr);
static int read_eeprom(long ioaddr, int location);
static int net_open(struct net_device *dev);
static int	net_send_packet(struct sk_buff *skb, struct net_device *dev);
static irqreturn_t net_interrupt(int irq, void *dev_id);
static void net_rx(struct net_device *dev);
static int net_close(struct net_device *dev);
static struct net_device_stats *net_get_stats(struct net_device *dev);
static void set_rx_mode(struct net_device *dev);
static void net_tx_timeout (struct net_device *dev);


#ifdef CONFIG_MCA_LEGACY
struct at1720_mca_adapters_struct {
	char* name;
	int id;
};
/* rEnE : maybe there are others I don't know off... */

static struct at1720_mca_adapters_struct at1720_mca_adapters[] __initdata = {
	{ "Allied Telesys AT1720AT",	0x6410 },
	{ "Allied Telesys AT1720BT", 	0x6413 },
	{ "Allied Telesys AT1720T",	0x6416 },
	{ NULL, 0 },
};
#endif

/* Check for a network adaptor of this type, and return '0' iff one exists.
   If dev->base_addr == 0, probe all likely locations.
   If dev->base_addr == 1, always return failure.
   If dev->base_addr == 2, allocate space for the device and return success
   (detachable devices only).
   */

static int io = 0x260;

static int irq;

static void cleanup_card(struct net_device *dev)
{
#ifdef CONFIG_MCA_LEGACY
	struct net_local *lp = netdev_priv(dev);
	if (lp->mca_slot >= 0)
		mca_mark_as_unused(lp->mca_slot);
#endif
	free_irq(dev->irq, NULL);
	release_region(dev->base_addr, AT1700_IO_EXTENT);
}

struct net_device * __init at1700_probe(int unit)
{
	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
	unsigned *port;
	int err = 0;

	if (!dev)
		return ERR_PTR(-ENODEV);

	if (unit >= 0) {
		sprintf(dev->name, "eth%d", unit);
		netdev_boot_setup_check(dev);
		io = dev->base_addr;
		irq = dev->irq;
	} else {
		dev->base_addr = io;
		dev->irq = irq;
	}

	SET_MODULE_OWNER(dev);

	if (io > 0x1ff) {	/* Check a single specified location. */
		err = at1700_probe1(dev, io);
	} else if (io != 0) {	/* Don't probe at all. */
		err = -ENXIO;
	} else {
		for (port = at1700_probe_list; *port; port++) {
			if (at1700_probe1(dev, *port) == 0)
				break;
			dev->irq = irq;
		}
		if (!*port)
			err = -ENODEV;
	}
	if (err)
		goto out;
	err = register_netdev(dev);
	if (err)
		goto out1;
	return dev;
out1:
	cleanup_card(dev);
out:
	free_netdev(dev);
	return ERR_PTR(err);
}

/* The Fujitsu datasheet suggests that the NIC be probed for by checking its
   "signature", the default bit pattern after a reset.  This *doesn't* work --
   there is no way to reset the bus interface without a complete power-cycle!

   It turns out that ATI came to the same conclusion I did: the only thing
   that can be done is checking a few bits and then diving right into an
   EEPROM read. */

static int __init at1700_probe1(struct net_device *dev, int ioaddr)
{
	char fmv_irqmap[4] = {3, 7, 10, 15};
	char fmv_irqmap_pnp[8] = {3, 4, 5, 7, 9, 10, 11, 15};
	char at1700_irqmap[8] = {3, 4, 5, 9, 10, 11, 14, 15};
	unsigned int i, irq, is_fmv18x = 0, is_at1700 = 0;
	int slot, ret = -ENODEV;
	struct net_local *lp = netdev_priv(dev);

	if (!request_region(ioaddr, AT1700_IO_EXTENT, DRV_NAME))
		return -EBUSY;

	/* Resetting the chip doesn't reset the ISA interface, so don't bother.
	   That means we have to be careful with the register values we probe
	   for.
	 */
#ifdef notdef
	printk("at1700 probe at %#x, eeprom is %4.4x %4.4x %4.4x ctrl %4.4x.\n",
		   ioaddr, read_eeprom(ioaddr, 4), read_eeprom(ioaddr, 5),
		   read_eeprom(ioaddr, 6), inw(ioaddr + EEPROM_Ctrl));
#endif

#ifdef CONFIG_MCA_LEGACY
	/* rEnE (rene@bss.lu): got this from 3c509 driver source , adapted for AT1720 */

    /* Based on Erik Nygren's (nygren@mit.edu) 3c529 patch, heavily
	modified by Chris Beauregard (cpbeaure@csclub.uwaterloo.ca)
	to support standard MCA probing. */

	/* redone for multi-card detection by ZP Gu (zpg@castle.net) */
	/* now works as a module */

	if (MCA_bus) {
		int j;
		int l_i;
		u_char pos3, pos4;

		for (j = 0; at1720_mca_adapters[j].name != NULL; j ++) {
			slot = 0;
			while (slot != MCA_NOTFOUND) {