drivers/net/arcnet/com20020.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * Linux ARCnet driver - COM20020 chipset support
  *
  * Written 1997 by David Woodhouse.
  * Written 1994-1999 by Avery Pennarun.
  * Written 1999 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 of skeleton.c 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.
  *
  * **********************
  *
  * For more details, see drivers/net/arcnet.c
  *
  * **********************
  */

 #define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/ioport.h>
 #include <linux/errno.h>
 #include <linux/delay.h>
 #include <linux/netdevice.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>

 #include "arcdevice.h"
 #include "com20020.h"

 static const char * const clockrates[] = {
 	"XXXXXXX", "XXXXXXXX", "XXXXXX", "2.5 Mb/s",
 	"1.25Mb/s", "625 Kb/s", "312.5 Kb/s", "156.25 Kb/s",
 	"Reserved", "Reserved", "Reserved"
 };

 static void com20020_command(struct net_device *dev, int command);
 static int com20020_status(struct net_device *dev);
 static void com20020_setmask(struct net_device *dev, int mask);
 static int com20020_reset(struct net_device *dev, int really_reset);
 static void com20020_copy_to_card(struct net_device *dev, int bufnum,
 				  int offset, void *buf, int count);
 static void com20020_copy_from_card(struct net_device *dev, int bufnum,
 				    int offset, void *buf, int count);
 static void com20020_set_mc_list(struct net_device *dev);
 static void com20020_close(struct net_device *);

 static void com20020_copy_from_card(struct net_device *dev, int bufnum,
 				    int offset, void *buf, int count)
 {
 	int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;

 	/* set up the address register */
 	arcnet_outb((ofs >> 8) | RDDATAflag | AUTOINCflag,
 		    ioaddr, COM20020_REG_W_ADDR_HI);
 	arcnet_outb(ofs & 0xff, ioaddr, COM20020_REG_W_ADDR_LO);

 	/* copy the data */
 	TIME(dev, "insb", count,
 	     arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
 }

 static void com20020_copy_to_card(struct net_device *dev, int bufnum,
 				  int offset, void *buf, int count)
 {
 	int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;

 	/* set up the address register */
 	arcnet_outb((ofs >> 8) | AUTOINCflag, ioaddr, COM20020_REG_W_ADDR_HI);
 	arcnet_outb(ofs & 0xff, ioaddr, COM20020_REG_W_ADDR_LO);

 	/* copy the data */
 	TIME(dev, "outsb", count,
 	     arcnet_outsb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
 }

 /* Reset the card and check some basic stuff during the detection stage. */
 int com20020_check(struct net_device *dev)
 {
 	int ioaddr = dev->base_addr, status;
 	struct arcnet_local *lp = netdev_priv(dev);

 	arcnet_outb(XTOcfg(3) | RESETcfg, ioaddr, COM20020_REG_W_CONFIG);
 	udelay(5);
 	arcnet_outb(XTOcfg(3), ioaddr, COM20020_REG_W_CONFIG);
 	mdelay(RESETtime);

 	lp->setup = lp->clockm ? 0 : (lp->clockp << 1);
 	lp->setup2 = (lp->clockm << 4) | 8;

 	/* CHECK: should we do this for SOHARD cards ? */
 	/* Enable P1Mode for backplane mode */
 	lp->setup = lp->setup | P1MODE;

 	com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
 	arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);

 	if (lp->clockm != 0) {
 		com20020_set_subaddress(lp, ioaddr, SUB_SETUP2);
 		arcnet_outb(lp->setup2, ioaddr, COM20020_REG_W_XREG);

 		/* must now write the magic "restart operation" command */
 		mdelay(1);
 		arcnet_outb(STARTIOcmd, ioaddr, COM20020_REG_W_COMMAND);
 	}

 	lp->config = (lp->timeout << 3) | (lp->backplane << 2) | SUB_NODE;
 	/* set node ID to 0x42 (but transmitter is disabled, so it's okay) */
 	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 	arcnet_outb(0x42, ioaddr, COM20020_REG_W_XREG);

 	status = arcnet_inb(ioaddr, COM20020_REG_R_STATUS);

 	if ((status & 0x99) != (NORXflag | TXFREEflag | RESETflag)) {
 		arc_printk(D_NORMAL, dev, "status invalid (%Xh).\n", status);
 		return -ENODEV;
 	}
 	arc_printk(D_INIT_REASONS, dev, "status after reset: %X\n", status);

 	arcnet_outb(CFLAGScmd | RESETclear | CONFIGclear,
 		    ioaddr, COM20020_REG_W_COMMAND);
 	status = arcnet_inb(ioaddr, COM20020_REG_R_STATUS);
 	arc_printk(D_INIT_REASONS, dev, "status after reset acknowledged: %X\n",
 		   status);

 	/* Read first location of memory */
 	arcnet_outb(0 | RDDATAflag | AUTOINCflag,
 		    ioaddr, COM20020_REG_W_ADDR_HI);
 	arcnet_outb(0, ioaddr, COM20020_REG_W_ADDR_LO);

 	status = arcnet_inb(ioaddr, COM20020_REG_RW_MEMDATA);
 	if (status != TESTvalue) {
 		arc_printk(D_NORMAL, dev, "Signature byte not found (%02Xh != D1h).\n",
 			   status);
 		return -ENODEV;
 	}
 	return 0;
 }

 static int com20020_set_hwaddr(struct net_device *dev, void *addr)
 {
 	int ioaddr = dev->base_addr;
 	struct arcnet_local *lp = netdev_priv(dev);
 	struct sockaddr *hwaddr = addr;

 	memcpy(dev->dev_addr, hwaddr->sa_data, 1);
 	com20020_set_subaddress(lp, ioaddr, SUB_NODE);
 	arcnet_outb(dev->dev_addr[0], ioaddr, COM20020_REG_W_XREG);

 	return 0;
 }

 static int com20020_netdev_open(struct net_device *dev)
 {
 	int ioaddr = dev->base_addr;
 	struct arcnet_local *lp = netdev_priv(dev);

 	lp->config |= TXENcfg;
 	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);

 	return arcnet_open(dev);
 }

 static int com20020_netdev_close(struct net_device *dev)
 {
 	int ioaddr = dev->base_addr;
 	struct arcnet_local *lp = netdev_priv(dev);

 	arcnet_close(dev);

 	/* disable transmitter */
 	lp->config &= ~TXENcfg;
 	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 	return 0;
 }

 const struct net_device_ops com20020_netdev_ops = {
 	.ndo_open	= com20020_netdev_open,
 	.ndo_stop	= com20020_netdev_close,
 	.ndo_start_xmit = arcnet_send_packet,
 	.ndo_tx_timeout = arcnet_timeout,
 	.ndo_set_mac_address = com20020_set_hwaddr,
 	.ndo_set_rx_mode = com20020_set_mc_list,
 };

 /* Set up the struct net_device associated with this card.  Called after
  * probing succeeds.
  */
 int com20020_found(struct net_device *dev, int shared)
 {
 	struct arcnet_local *lp;
 	int ioaddr = dev->base_addr;

 	/* Initialize the rest of the device structure. */

 	lp = netdev_priv(dev);

 	lp->hw.owner = THIS_MODULE;
 	lp->hw.command = com20020_command;
 	lp->hw.status = com20020_status;
 	lp->hw.intmask = com20020_setmask;
 	lp->hw.reset = com20020_reset;
 	lp->hw.copy_to_card = com20020_copy_to_card;
 	lp->hw.copy_from_card = com20020_copy_from_card;
 	lp->hw.close = com20020_close;

 	/* FIXME: do this some other way! */
 	if (!dev->dev_addr[0])
 		dev->dev_addr[0] = arcnet_inb(ioaddr, 8);

 	com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
 	arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);

 	if (lp->card_flags & ARC_CAN_10MBIT) {
 		com20020_set_subaddress(lp, ioaddr, SUB_SETUP2);
 		arcnet_outb(lp->setup2, ioaddr, COM20020_REG_W_XREG);

 		/* must now write the magic "restart operation" command */
 		mdelay(1);
 		arcnet_outb(STARTIOcmd, ioaddr, COM20020_REG_W_COMMAND);
 	}

 	lp->config = (lp->timeout << 3) | (lp->backplane << 2) | SUB_NODE;
 	/* Default 0x38 + register: Node ID */
 	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 	arcnet_outb(dev->dev_addr[0], ioaddr, COM20020_REG_W_XREG);

 	/* reserve the irq */
 	if (request_irq(dev->irq, arcnet_interrupt, shared,
 			"arcnet (COM20020)", dev)) {
 		arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
 		return -ENODEV;
 	}

 	arc_printk(D_NORMAL, dev, "%s: station %02Xh found at %03lXh, IRQ %d.\n",
 		   lp->card_name, dev->dev_addr[0], dev->base_addr, dev->irq);

 	if (lp->backplane)
 		arc_printk(D_NORMAL, dev, "Using backplane mode.\n");

 	if (lp->timeout != 3)
 		arc_printk(D_NORMAL, dev, "Using extended timeout value of %d\n",
 			   lp->timeout);

 	arc_printk(D_NORMAL, dev, "Using CKP %d - data rate %s\n",
 		   lp->setup >> 1,
 		   clockrates[3 -
 			      ((lp->setup2 & 0xF0) >> 4) +
 			      ((lp->setup & 0x0F) >> 1)]);
 			/* The clockrates array index looks very fragile.
 			 * It seems like it could have negative indexing.
 			 */

 	if (register_netdev(dev)) {
 		free_irq(dev->irq, dev);
 		return -EIO;
 	}
 	return 0;
 }

 /* Do a hardware reset on the card, and set up necessary registers.
  *
  * This should be called as little as possible, because it disrupts the
  * token on the network (causes a RECON) and requires a significant delay.
  *
  * However, it does make sure the card is in a defined state.
  */
 static int com20020_reset(struct net_device *dev, int really_reset)
 {
 	struct arcnet_local *lp = netdev_priv(dev);
 	u_int ioaddr = dev->base_addr;
 	u_char inbyte;

 	arc_printk(D_DEBUG, dev, "%s: %d: %s: dev: %p, lp: %p, dev->name: %s\n",
 		   __FILE__, __LINE__, __func__, dev, lp, dev->name);
 	arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n",
 		   dev->name, arcnet_inb(ioaddr, COM20020_REG_R_STATUS));

 	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
 	lp->config |= (lp->timeout << 3) | (lp->backplane << 2);
 	/* power-up defaults */
 	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);

 	if (really_reset) {
 		/* reset the card */
 		arcnet_outb(lp->config | RESETcfg, ioaddr, COM20020_REG_W_CONFIG);
 		udelay(5);
 		arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 		mdelay(RESETtime * 2);
 				/* COM20020 seems to be slower sometimes */
 	}
 	/* clear flags & end reset */
 	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
 	arcnet_outb(CFLAGScmd | RESETclear | CONFIGclear,
 		    ioaddr, COM20020_REG_W_COMMAND);

 	/* verify that the ARCnet signature byte is present */
 	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);

 	com20020_copy_from_card(dev, 0, 0, &inbyte, 1);
 	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
 	if (inbyte != TESTvalue) {
 		arc_printk(D_DEBUG, dev, "%s: %d: %s\n",
 			   __FILE__, __LINE__, __func__);
 		arc_printk(D_NORMAL, dev, "reset failed: TESTvalue not present.\n");
 		return 1;
 	}
 	/* enable extended (512-byte) packets */
 	arcnet_outb(CONFIGcmd | EXTconf, ioaddr, COM20020_REG_W_COMMAND);

 	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);

 	/* done!  return success. */
 	return 0;
 }

 static void com20020_setmask(struct net_device *dev, int mask)
 {
 	u_int ioaddr = dev->base_addr;

 	arc_printk(D_DURING, dev, "Setting mask to %x at %x\n", mask, ioaddr);
 	arcnet_outb(mask, ioaddr, COM20020_REG_W_INTMASK);
 }

 static void com20020_command(struct net_device *dev, int cmd)
 {
 	u_int ioaddr = dev->base_addr;

 	arcnet_outb(cmd, ioaddr, COM20020_REG_W_COMMAND);
 }

 static int com20020_status(struct net_device *dev)
 {
 	u_int ioaddr = dev->base_addr;

 	return arcnet_inb(ioaddr, COM20020_REG_R_STATUS) +
 		(arcnet_inb(ioaddr, COM20020_REG_R_DIAGSTAT) << 8);
 }

 static void com20020_close(struct net_device *dev)
 {
 	struct arcnet_local *lp = netdev_priv(dev);
 	int ioaddr = dev->base_addr;

 	/* disable transmitter */
 	lp->config &= ~TXENcfg;
 	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
 }

 /* Set or clear the multicast filter for this adaptor.
  * num_addrs == -1    Promiscuous mode, receive all packets
  * num_addrs == 0       Normal mode, clear multicast list
  * num_addrs > 0        Multicast mode, receive normal and MC packets, and do
  *                      best-effort filtering.
  *      FIXME - do multicast stuff, not just promiscuous.
  */
 static void com20020_set_mc_list(struct net_device *dev)
 {
 	struct arcnet_local *lp = netdev_priv(dev);
 	int ioaddr = dev->base_addr;

 	if ((dev->flags & IFF_PROMISC) && (dev->flags & IFF_UP)) {
 		/* Enable promiscuous mode */
 		if (!(lp->setup & PROMISCset))
 			arc_printk(D_NORMAL, dev, "Setting promiscuous flag...\n");
 		com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
 		lp->setup |= PROMISCset;
 		arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
 	} else {
 		/* Disable promiscuous mode, use normal mode */
 		if ((lp->setup & PROMISCset))
 			arc_printk(D_NORMAL, dev, "Resetting promiscuous flag...\n");
 		com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
 		lp->setup &= ~PROMISCset;
 		arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
 	}
 }

 #if defined(CONFIG_ARCNET_COM20020_PCI_MODULE) || \
     defined(CONFIG_ARCNET_COM20020_ISA_MODULE) || \
     defined(CONFIG_ARCNET_COM20020_CS_MODULE)
 EXPORT_SYMBOL(com20020_check);
 EXPORT_SYMBOL(com20020_found);
 EXPORT_SYMBOL(com20020_netdev_ops);
 #endif

 MODULE_LICENSE("GPL");

 #ifdef MODULE

 static int __init com20020_module_init(void)
 {
 	if (BUGLVL(D_NORMAL))
 		pr_info("%s\n", "COM20020 chipset support (by David Woodhouse et al.)");
 	return 0;
 }

 static void __exit com20020_module_exit(void)
 {
 }
 module_init(com20020_module_init);
 module_exit(com20020_module_exit);
 #endif				/* MODULE */
	/*
	* Linux ARCnet driver - COM20020 chipset support
	*
	* Written 1997 by David Woodhouse.
	* Written 1994-1999 by Avery Pennarun.
	* Written 1999 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 of skeleton.c 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.
	*
	* **********************
	*
	* For more details, see drivers/net/arcnet.c
	*
	* **********************
	*/

	#define pr_fmt(fmt) "arcnet:" KBUILD_MODNAME ": " fmt

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/types.h>
	#include <linux/ioport.h>
	#include <linux/errno.h>
	#include <linux/delay.h>
	#include <linux/netdevice.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>
	#include <linux/io.h>

	#include "arcdevice.h"
	#include "com20020.h"

	static const char * const clockrates[] = {
	"XXXXXXX", "XXXXXXXX", "XXXXXX", "2.5 Mb/s",
	"1.25Mb/s", "625 Kb/s", "312.5 Kb/s", "156.25 Kb/s",
	"Reserved", "Reserved", "Reserved"
	};

	static void com20020_command(struct net_device *dev, int command);
	static int com20020_status(struct net_device *dev);
	static void com20020_setmask(struct net_device *dev, int mask);
	static int com20020_reset(struct net_device *dev, int really_reset);
	static void com20020_copy_to_card(struct net_device *dev, int bufnum,
	int offset, void *buf, int count);
	static void com20020_copy_from_card(struct net_device *dev, int bufnum,
	int offset, void *buf, int count);
	static void com20020_set_mc_list(struct net_device *dev);
	static void com20020_close(struct net_device *);

	static void com20020_copy_from_card(struct net_device *dev, int bufnum,
	int offset, void *buf, int count)
	{
	int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;

	/* set up the address register */
	arcnet_outb((ofs >> 8) \| RDDATAflag \| AUTOINCflag,
	ioaddr, COM20020_REG_W_ADDR_HI);
	arcnet_outb(ofs & 0xff, ioaddr, COM20020_REG_W_ADDR_LO);

	/* copy the data */
	TIME(dev, "insb", count,
	arcnet_insb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
	}

	static void com20020_copy_to_card(struct net_device *dev, int bufnum,
	int offset, void *buf, int count)
	{
	int ioaddr = dev->base_addr, ofs = 512 * bufnum + offset;

	/* set up the address register */
	arcnet_outb((ofs >> 8) \| AUTOINCflag, ioaddr, COM20020_REG_W_ADDR_HI);
	arcnet_outb(ofs & 0xff, ioaddr, COM20020_REG_W_ADDR_LO);

	/* copy the data */
	TIME(dev, "outsb", count,
	arcnet_outsb(ioaddr, COM20020_REG_RW_MEMDATA, buf, count));
	}

	/* Reset the card and check some basic stuff during the detection stage. */
	int com20020_check(struct net_device *dev)
	{
	int ioaddr = dev->base_addr, status;
	struct arcnet_local *lp = netdev_priv(dev);

	arcnet_outb(XTOcfg(3) \| RESETcfg, ioaddr, COM20020_REG_W_CONFIG);
	udelay(5);
	arcnet_outb(XTOcfg(3), ioaddr, COM20020_REG_W_CONFIG);
	mdelay(RESETtime);

	lp->setup = lp->clockm ? 0 : (lp->clockp << 1);
	lp->setup2 = (lp->clockm << 4) \| 8;

	/* CHECK: should we do this for SOHARD cards ? */
	/* Enable P1Mode for backplane mode */
	lp->setup = lp->setup \| P1MODE;

	com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
	arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);

	if (lp->clockm != 0) {
	com20020_set_subaddress(lp, ioaddr, SUB_SETUP2);
	arcnet_outb(lp->setup2, ioaddr, COM20020_REG_W_XREG);

	/* must now write the magic "restart operation" command */
	mdelay(1);
	arcnet_outb(STARTIOcmd, ioaddr, COM20020_REG_W_COMMAND);
	}

	lp->config = (lp->timeout << 3) \| (lp->backplane << 2) \| SUB_NODE;
	/* set node ID to 0x42 (but transmitter is disabled, so it's okay) */
	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
	arcnet_outb(0x42, ioaddr, COM20020_REG_W_XREG);

	status = arcnet_inb(ioaddr, COM20020_REG_R_STATUS);

	if ((status & 0x99) != (NORXflag \| TXFREEflag \| RESETflag)) {
	arc_printk(D_NORMAL, dev, "status invalid (%Xh).\n", status);
	return -ENODEV;
	}
	arc_printk(D_INIT_REASONS, dev, "status after reset: %X\n", status);

	arcnet_outb(CFLAGScmd \| RESETclear \| CONFIGclear,
	ioaddr, COM20020_REG_W_COMMAND);
	status = arcnet_inb(ioaddr, COM20020_REG_R_STATUS);
	arc_printk(D_INIT_REASONS, dev, "status after reset acknowledged: %X\n",
	status);

	/* Read first location of memory */
	arcnet_outb(0 \| RDDATAflag \| AUTOINCflag,
	ioaddr, COM20020_REG_W_ADDR_HI);
	arcnet_outb(0, ioaddr, COM20020_REG_W_ADDR_LO);

	status = arcnet_inb(ioaddr, COM20020_REG_RW_MEMDATA);
	if (status != TESTvalue) {
	arc_printk(D_NORMAL, dev, "Signature byte not found (%02Xh != D1h).\n",
	status);
	return -ENODEV;
	}
	return 0;
	}

	static int com20020_set_hwaddr(struct net_device dev, void addr)
	{
	int ioaddr = dev->base_addr;
	struct arcnet_local *lp = netdev_priv(dev);
	struct sockaddr *hwaddr = addr;

	memcpy(dev->dev_addr, hwaddr->sa_data, 1);
	com20020_set_subaddress(lp, ioaddr, SUB_NODE);
	arcnet_outb(dev->dev_addr[0], ioaddr, COM20020_REG_W_XREG);

	return 0;
	}

	static int com20020_netdev_open(struct net_device *dev)
	{
	int ioaddr = dev->base_addr;
	struct arcnet_local *lp = netdev_priv(dev);

	lp->config \|= TXENcfg;
	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);

	return arcnet_open(dev);
	}

	static int com20020_netdev_close(struct net_device *dev)
	{
	int ioaddr = dev->base_addr;
	struct arcnet_local *lp = netdev_priv(dev);

	arcnet_close(dev);

	/* disable transmitter */
	lp->config &= ~TXENcfg;
	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
	return 0;
	}

	const struct net_device_ops com20020_netdev_ops = {
	.ndo_open = com20020_netdev_open,
	.ndo_stop = com20020_netdev_close,
	.ndo_start_xmit = arcnet_send_packet,
	.ndo_tx_timeout = arcnet_timeout,
	.ndo_set_mac_address = com20020_set_hwaddr,
	.ndo_set_rx_mode = com20020_set_mc_list,
	};

	/* Set up the struct net_device associated with this card. Called after
	* probing succeeds.
	*/
	int com20020_found(struct net_device *dev, int shared)
	{
	struct arcnet_local *lp;
	int ioaddr = dev->base_addr;

	/* Initialize the rest of the device structure. */

	lp = netdev_priv(dev);

	lp->hw.owner = THIS_MODULE;
	lp->hw.command = com20020_command;
	lp->hw.status = com20020_status;
	lp->hw.intmask = com20020_setmask;
	lp->hw.reset = com20020_reset;
	lp->hw.copy_to_card = com20020_copy_to_card;
	lp->hw.copy_from_card = com20020_copy_from_card;
	lp->hw.close = com20020_close;

	/* FIXME: do this some other way! */
	if (!dev->dev_addr[0])
	dev->dev_addr[0] = arcnet_inb(ioaddr, 8);

	com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
	arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);

	if (lp->card_flags & ARC_CAN_10MBIT) {
	com20020_set_subaddress(lp, ioaddr, SUB_SETUP2);
	arcnet_outb(lp->setup2, ioaddr, COM20020_REG_W_XREG);

	/* must now write the magic "restart operation" command */
	mdelay(1);
	arcnet_outb(STARTIOcmd, ioaddr, COM20020_REG_W_COMMAND);
	}

	lp->config = (lp->timeout << 3) \| (lp->backplane << 2) \| SUB_NODE;
	/* Default 0x38 + register: Node ID */
	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
	arcnet_outb(dev->dev_addr[0], ioaddr, COM20020_REG_W_XREG);

	/* reserve the irq */
	if (request_irq(dev->irq, arcnet_interrupt, shared,
	"arcnet (COM20020)", dev)) {
	arc_printk(D_NORMAL, dev, "Can't get IRQ %d!\n", dev->irq);
	return -ENODEV;
	}

	arc_printk(D_NORMAL, dev, "%s: station %02Xh found at %03lXh, IRQ %d.\n",
	lp->card_name, dev->dev_addr[0], dev->base_addr, dev->irq);

	if (lp->backplane)
	arc_printk(D_NORMAL, dev, "Using backplane mode.\n");

	if (lp->timeout != 3)
	arc_printk(D_NORMAL, dev, "Using extended timeout value of %d\n",
	lp->timeout);

	arc_printk(D_NORMAL, dev, "Using CKP %d - data rate %s\n",
	lp->setup >> 1,
	clockrates[3 -
	((lp->setup2 & 0xF0) >> 4) +
	((lp->setup & 0x0F) >> 1)]);
	/* The clockrates array index looks very fragile.
	* It seems like it could have negative indexing.
	*/

	if (register_netdev(dev)) {
	free_irq(dev->irq, dev);
	return -EIO;
	}
	return 0;
	}

	/* Do a hardware reset on the card, and set up necessary registers.
	*
	* This should be called as little as possible, because it disrupts the
	* token on the network (causes a RECON) and requires a significant delay.
	*
	* However, it does make sure the card is in a defined state.
	*/
	static int com20020_reset(struct net_device *dev, int really_reset)
	{
	struct arcnet_local *lp = netdev_priv(dev);
	u_int ioaddr = dev->base_addr;
	u_char inbyte;

	arc_printk(D_DEBUG, dev, "%s: %d: %s: dev: %p, lp: %p, dev->name: %s\n",
	__FILE__, __LINE__, __func__, dev, lp, dev->name);
	arc_printk(D_INIT, dev, "Resetting %s (status=%02Xh)\n",
	dev->name, arcnet_inb(ioaddr, COM20020_REG_R_STATUS));

	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
	lp->config \|= (lp->timeout << 3) \| (lp->backplane << 2);
	/* power-up defaults */
	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);

	if (really_reset) {
	/* reset the card */
	arcnet_outb(lp->config \| RESETcfg, ioaddr, COM20020_REG_W_CONFIG);
	udelay(5);
	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
	mdelay(RESETtime * 2);
	/* COM20020 seems to be slower sometimes */
	}
	/* clear flags & end reset */
	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
	arcnet_outb(CFLAGScmd \| RESETclear \| CONFIGclear,
	ioaddr, COM20020_REG_W_COMMAND);

	/* verify that the ARCnet signature byte is present */
	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);

	com20020_copy_from_card(dev, 0, 0, &inbyte, 1);
	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);
	if (inbyte != TESTvalue) {
	arc_printk(D_DEBUG, dev, "%s: %d: %s\n",
	__FILE__, __LINE__, __func__);
	arc_printk(D_NORMAL, dev, "reset failed: TESTvalue not present.\n");
	return 1;
	}
	/* enable extended (512-byte) packets */
	arcnet_outb(CONFIGcmd \| EXTconf, ioaddr, COM20020_REG_W_COMMAND);

	arc_printk(D_DEBUG, dev, "%s: %d: %s\n", __FILE__, __LINE__, __func__);

	/* done! return success. */
	return 0;
	}

	static void com20020_setmask(struct net_device *dev, int mask)
	{
	u_int ioaddr = dev->base_addr;

	arc_printk(D_DURING, dev, "Setting mask to %x at %x\n", mask, ioaddr);
	arcnet_outb(mask, ioaddr, COM20020_REG_W_INTMASK);
	}

	static void com20020_command(struct net_device *dev, int cmd)
	{
	u_int ioaddr = dev->base_addr;

	arcnet_outb(cmd, ioaddr, COM20020_REG_W_COMMAND);
	}

	static int com20020_status(struct net_device *dev)
	{
	u_int ioaddr = dev->base_addr;

	return arcnet_inb(ioaddr, COM20020_REG_R_STATUS) +
	(arcnet_inb(ioaddr, COM20020_REG_R_DIAGSTAT) << 8);
	}

	static void com20020_close(struct net_device *dev)
	{
	struct arcnet_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;

	/* disable transmitter */
	lp->config &= ~TXENcfg;
	arcnet_outb(lp->config, ioaddr, COM20020_REG_W_CONFIG);
	}

	/* Set or clear the multicast filter for this adaptor.
	* num_addrs == -1 Promiscuous mode, receive all packets
	* num_addrs == 0 Normal mode, clear multicast list
	* num_addrs > 0 Multicast mode, receive normal and MC packets, and do
	* best-effort filtering.
	* FIXME - do multicast stuff, not just promiscuous.
	*/
	static void com20020_set_mc_list(struct net_device *dev)
	{
	struct arcnet_local *lp = netdev_priv(dev);
	int ioaddr = dev->base_addr;

	if ((dev->flags & IFF_PROMISC) && (dev->flags & IFF_UP)) {
	/* Enable promiscuous mode */
	if (!(lp->setup & PROMISCset))
	arc_printk(D_NORMAL, dev, "Setting promiscuous flag...\n");
	com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
	lp->setup \|= PROMISCset;
	arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
	} else {
	/* Disable promiscuous mode, use normal mode */
	if ((lp->setup & PROMISCset))
	arc_printk(D_NORMAL, dev, "Resetting promiscuous flag...\n");
	com20020_set_subaddress(lp, ioaddr, SUB_SETUP1);
	lp->setup &= ~PROMISCset;
	arcnet_outb(lp->setup, ioaddr, COM20020_REG_W_XREG);
	}
	}

	#if defined(CONFIG_ARCNET_COM20020_PCI_MODULE) \|\| \
	defined(CONFIG_ARCNET_COM20020_ISA_MODULE) \|\| \
	defined(CONFIG_ARCNET_COM20020_CS_MODULE)
	EXPORT_SYMBOL(com20020_check);
	EXPORT_SYMBOL(com20020_found);
	EXPORT_SYMBOL(com20020_netdev_ops);
	#endif

	MODULE_LICENSE("GPL");

	#ifdef MODULE

	static int __init com20020_module_init(void)
	{
	if (BUGLVL(D_NORMAL))
	pr_info("%s\n", "COM20020 chipset support (by David Woodhouse et al.)");
	return 0;
	}

	static void __exit com20020_module_exit(void)
	{
	}
	module_init(com20020_module_init);
	module_exit(com20020_module_exit);
	#endif /* MODULE */