com90xx.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/*
 * Linux ARCnet driver - COM90xx chipset (memory-mapped buffers)
 * 
 * Written 1994-1999 by Avery Pennarun.
 * Written 1999 by Martin Mares <[e-mail]>.
 * 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
 *
 * **********************
 */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/bootmem.h>
#include <asm/io.h>
#include <linux/arcdevice.h>


#define VERSION "arcnet: COM90xx chipset support\n"


/* Define this to speed up the autoprobe by assuming if only one io port and
 * shmem are left in the list at Stage 5, they must correspond to each
 * other.
 *
 * This is undefined by default because it might not always be true, and the
 * extra check makes the autoprobe even more careful.  Speed demons can turn
 * it on - I think it should be fine if you only have one ARCnet card
 * installed.
 *
 * If no ARCnet cards are installed, this delay never happens anyway and thus
 * the option has no effect.
 */
#undef FAST_PROBE


/* Internal function declarations */
static int com90xx_found(struct net_device *dev, int ioaddr, int airq,
			 u_long shmem);
static void com90xx_command(struct net_device *dev, int command);
static int com90xx_status(struct net_device *dev);
static void com90xx_setmask(struct net_device *dev, int mask);
static int com90xx_reset(struct net_device *dev, int really_reset);
static void com90xx_openclose(struct net_device *dev, bool open);
static void com90xx_copy_to_card(struct net_device *dev, int bufnum, int offset,
				 void *buf, int count);
static void com90xx_copy_from_card(struct net_device *dev, int bufnum, int offset,
				   void *buf, int count);

/* Known ARCnet cards */

static struct net_device *cards[16];
static int numcards;

/* Handy defines for ARCnet specific stuff */

/* The number of low I/O ports used by the card */
#define ARCNET_TOTAL_SIZE	16

/* Amount of I/O memory used by the card */
#define BUFFER_SIZE (512)
#define MIRROR_SIZE (BUFFER_SIZE*4)

/* COM 9026 controller chip --> ARCnet register addresses */
#define _INTMASK (ioaddr+0)	/* writable */
#define _STATUS  (ioaddr+0)	/* readable */
#define _COMMAND (ioaddr+1)	/* writable, returns random vals on read (?) */
#define _CONFIG  (ioaddr+2)	/* Configuration register */
#define _RESET   (ioaddr+8)	/* software reset (on read) */
#define _MEMDATA (ioaddr+12)	/* Data port for IO-mapped memory */
#define _ADDR_HI (ioaddr+15)	/* Control registers for said */
#define _ADDR_LO (ioaddr+14)

#undef ASTATUS
#undef ACOMMAND
#undef AINTMASK

#define ASTATUS()	inb(_STATUS)
#define ACOMMAND(cmd) 	outb((cmd),_COMMAND)
#define AINTMASK(msk)	outb((msk),_INTMASK)


static int com90xx_skip_probe __initdata = 0;

int __init com90xx_probe(struct net_device *dev)
{
	int count, status, ioaddr, numprint, airq, retval = -ENODEV,
	 openparen = 0;
	unsigned long airqmask;
	int ports[(0x3f0 - 0x200) / 16 + 1] =
	{0};
	u_long shmems[(0xFF800 - 0xA0000) / 2048 + 1] =
	{0};
	int numports, numshmems, *port;
	u_long *shmem;

	if (!dev && com90xx_skip_probe)
		return -ENODEV;

#ifndef MODULE
	arcnet_init();
#endif

	BUGLVL(D_NORMAL) printk(VERSION);

	/* set up the arrays where we'll store the possible probe addresses */
	numports = numshmems = 0;
	if (dev && dev->base_addr)
		ports[numports++] = dev->base_addr;
	else
		for (count = 0x200; count <= 0x3f0; count += 16)
			ports[numports++] = count;
	if (dev && dev->mem_start)
		shmems[numshmems++] = dev->mem_start;
	else
		for (count = 0xA0000; count <= 0xFF800; count += 2048)
			shmems[numshmems++] = count;

	/* Stage 1: abandon any reserved ports, or ones with status==0xFF
	 * (empty), and reset any others by reading the reset port.
	 */
	numprint = -1;
	for (port = &ports[0]; port - ports < numports; port++) {
		numprint++;
		numprint %= 8;
		if (!numprint) {
			BUGMSG2(D_INIT, "\n");
			BUGMSG2(D_INIT, "S1: ");
		}
		BUGMSG2(D_INIT, "%Xh ", *port);

		ioaddr = *port;

		if (check_region(*port, ARCNET_TOTAL_SIZE)) {
			BUGMSG2(D_INIT_REASONS, "(check_region)\n");
			BUGMSG2(D_INIT_REASONS, "S1: ");
			BUGLVL(D_INIT_REASONS) numprint = 0;
			*port = ports[numports - 1];
			numports--;
			port--;
			continue;
		}
		if (ASTATUS() == 0xFF) {
			BUGMSG2(D_INIT_REASONS, "(empty)\n");
			BUGMSG2(D_INIT_REASONS, "S1: ");
			BUGLVL(D_INIT_REASONS) numprint = 0;
			*port = ports[numports - 1];
			numports--;
			port--;
			continue;
		}
		inb(_RESET);	/* begin resetting card */

		BUGMSG2(D_INIT_REASONS, "\n");
		BUGMSG2(D_INIT_REASONS, "S1: ");
		BUGLVL(D_INIT_REASONS) numprint = 0;
	}
	BUGMSG2(D_INIT, "\n");

	if (!numports) {
		BUGMSG2(D_NORMAL, "S1: No ARCnet cards found.\n");
		return -ENODEV;
	}
	/* Stage 2: we have now reset any possible ARCnet cards, so we can't
	 * do anything until they finish.  If D_INIT, print the list of
	 * cards that are left.
	 */
	numprint = -1;
	for (port = &ports[0]; port - ports < numports; port++) {
		numprint++;
		numprint %= 8;
		if (!numprint) {
			BUGMSG2(D_INIT, "\n");
			BUGMSG2(D_INIT, "S2: ");
		}
		BUGMSG2(D_INIT, "%Xh ", *port);
	}
	BUGMSG2(D_INIT, "\n");
	mdelay(RESETtime);

	/* Stage 3: abandon any shmem addresses that don't have the signature
	 * 0xD1 byte in the right place, or are read-only.
	 */
	numprint = -1;
	for (shmem = &shmems[0]; shmem - shmems < numshmems; shmem++) {
		u_long ptr = *shmem;

		numprint++;
		numprint %= 8;
		if (!numprint) {
			BUGMSG2(D_INIT, "\n");
			BUGMSG2(D_INIT, "S3: ");
		}
		BUGMSG2(D_INIT, "%lXh ", *shmem);

		if (check_mem_region(*shmem, BUFFER_SIZE)) {
			BUGMSG2(D_INIT_REASONS, "(check_mem_region)\n");
			BUGMSG2(D_INIT_REASONS, "Stage 3: ");
			BUGLVL(D_INIT_REASONS) numprint = 0;
			*shmem = shmems[numshmems - 1];
			numshmems--;
			shmem--;
			continue;
		}
		if (isa_readb(ptr) != TESTvalue) {
			BUGMSG2(D_INIT_REASONS, "(%02Xh != %02Xh)\n",
				isa_readb(ptr), TESTvalue);
			BUGMSG2(D_INIT_REASONS, "S3: ");
			BUGLVL(D_INIT_REASONS) numprint = 0;
			*shmem = shmems[numshmems - 1];
			numshmems--;
			shmem--;
			continue;
		}
		/* By writing 0x42 to the TESTvalue location, we also make
		 * sure no "mirror" shmem areas show up - if they occur
		 * in another pass through this loop, they will be discarded
		 * because *cptr != TESTvalue.
		 */
		isa_writeb(0x42, ptr);
		if (isa_readb(ptr) != 0x42) {
			BUGMSG2(D_INIT_REASONS, "(read only)\n");
			BUGMSG2(D_INIT_REASONS, "S3: ");
			*shmem = shmems[numshmems - 1];
			numshmems--;
			shmem--;
			continue;
		}
		BUGMSG2(D_INIT_REASONS, "\n");
		BUGMSG2(D_INIT_REASONS, "S3: ");
		BUGLVL(D_INIT_REASONS) numprint = 0;
	}
	BUGMSG2(D_INIT, "\n");

	if (!numshmems) {
		BUGMSG2(D_NORMAL, "S3: No ARCnet cards found.\n");
		return -ENODEV;
	}
	/* Stage 4: something of a dummy, to report the shmems that are
	 * still possible after stage 3.
	 */
	numprint = -1;
	for (shmem = &shmems[0]; shmem - shmems < numshmems; shmem++) {
		numprint++;
		numprint %= 8;
		if (!numprint) {
			BUGMSG2(D_INIT, "\n");
			BUGMSG2(D_INIT, "S4: ");
		}
		BUGMSG2(D_INIT, "%lXh ", *shmem);
	}
	BUGMSG2(D_INIT, "\n");

	/* Stage 5: for any ports that have the correct status, can disable
	 * the RESET flag, and (if no irq is given) generate an autoirq,
	 * register an ARCnet device.
	 *
	 * Currently, we can only register one device per probe, so quit
	 * after the first one is found.
	 */
	numprint = -1;
	for (port = &ports[0]; port - ports < numports; port++) {
		numprint++;
		numprint %= 8;
		if (!numprint) {
			BUGMSG2(D_INIT, "\n");
			BUGMSG2(D_INIT, "S5: ");
		}
		BUGMSG2(D_INIT, "%Xh ", *port);

		ioaddr = *port;
		status = ASTATUS();

		if ((status & 0x9D)
		    != (NORXflag | RECONflag | TXFREEflag | RESETflag)) {
			BUGMSG2(D_INIT_REASONS, "(status=%Xh)\n", status);
			BUGMSG2(D_INIT_REASONS, "S5: ");
			BUGLVL(D_INIT_REASONS) numprint = 0;
			*port = ports[numports - 1];
			numports--;
			port--;
			continue;
		}
		ACOMMAND(CFLAGScmd | RESETclear | CONFIGclear);
		status = ASTATUS();
		if (status & RESETflag) {
			BUGMSG2(D_INIT_REASONS, " (eternal reset, status=%Xh)\n",
				status);
			BUGMSG2(D_INIT_REASONS, "S5: ");
			BUGLVL(D_INIT_REASONS) numprint = 0;
			*port = ports[numports - 1];
			numports--;
			port--;
			continue;
		}
		/* skip this completely if an IRQ was given, because maybe
		 * we're on a machine that locks during autoirq!
		 */
		if (!dev || !dev->irq) {
			/* if we do this, we're sure to get an IRQ since the
			 * card has just reset and the NORXflag is on until
			 * we tell it to start receiving.
			 */
			airqmask = probe_irq_on();
			AINTMASK(NORXflag);
			udelay(1);
			AINTMASK(0);
			airq = probe_irq_off(airqmask);

			if (airq <= 0) {
				BUGMSG2(D_INIT_REASONS, "(airq=%d)\n", airq);
				BUGMSG2(D_INIT_REASONS, "S5: ");
				BUGLVL(D_INIT_REASONS) numprint = 0;
				*port = ports[numports - 1];
				numports--;
				port--;
				continue;
			}
		} else {
			airq = dev->irq;
		}

		BUGMSG2(D_INIT, "(%d,", airq);
		openparen = 1;

		/* Everything seems okay.  But which shmem, if any, puts
		 * back its signature byte when the card is reset?
		 *
		 * If there are multiple cards installed, there might be
		 * multiple shmems still in the list.
		 */
#ifdef FAST_PROBE
		if (numports > 1 || numshmems > 1) {
			inb(_RESET);
			mdelay(RESETtime);
		} else {
			/* just one shmem and port, assume they match */