ne2.c

嵌入式系统的TCP/IP源代码

/* ne2.c: A NE/2 Ethernet Driver for Linux. */
/*
   Based on the NE2000 driver written by Donald Becker (1992-94).
   modified by Wim Dumon (Apr 1996)

   This software may be used and distributed according to the terms
   of the GNU Public License, incorporated herein by reference.

   The author may be reached as [e-mail]

   Currently supported: NE/2
   This patch was never tested on other MCA-ethernet adapters, but it
   might work. Just give it a try and let me know if you have problems.
   Also mail me if it really works, please!

   Changelog:
   Mon Feb  3 16:26:02 MET 1997
   - adapted the driver to work with the 2.1.25 kernel
   - multiple ne2 support (untested)
   - module support (untested)

   Fri Aug 28 00:18:36 CET 1998 (David Weinehall)
   - fixed a few minor typos
   - made the MODULE_PARM conditional (it only works with the v2.1.x kernels)
   - fixed the module support (Now it's working...)

   Mon Sep  7 19:01:44 CET 1998 (David Weinehall)
   - added support for Arco Electronics AE/2-card (experimental)

   Mon Sep 14 09:53:42 CET 1998 (David Weinehall)
   - added support for Compex ENET-16MC/P (experimental) 

   Tue Sep 15 16:21:12 CET 1998 (David Weinehall, Magnus Jonsson, Tomas Ogren)
   - Miscellaneous bugfixes

   Tue Sep 19 16:21:12 CET 1998 (Magnus Jonsson)
   - Cleanup

   Wed Sep 23 14:33:34 CET 1998 (David Weinehall)
   - Restructuring and rewriting for v2.1.x compliance

   Wed Oct 14 17:19:21 CET 1998 (David Weinehall)
   - Added code that unregisters irq and proc-info
   - Version# bump

   Mon Nov 16 15:28:23 CET 1998 (Wim Dumon)
   - pass 'dev' as last parameter of request_irq in stead of 'NULL'   
   
   *    WARNING
	-------
	This is alpha-test software.  It is not guaranteed to work. As a
	matter of fact, I'm quite sure there are *LOTS* of bugs in here. I
	would like to hear from you if you use this driver, even if it works.
	If it doesn't work, be sure to send me a mail with the problems !
*/

static const char *version = "ne2.c:v0.91 Nov 16 1998 Wim Dumon <[e-mail]>\n";

#include <linux/module.h>
#include <linux/version.h>

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/malloc.h>
#include <linux/string.h>
#include <asm/system.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/mca.h>

#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include "8390.h"



/* Some defines that people can play with if so inclined. */

/* Do we perform extra sanity checks on stuff ? */
/* #define NE_SANITY_CHECK */

/* Do we implement the read before write bugfix ? */
/* #define NE_RW_BUGFIX */

/* Do we have a non std. amount of memory? (in units of 256 byte pages) */
/* #define PACKETBUF_MEMSIZE	0x40 */


/* ---- No user-serviceable parts below ---- */

#define NE_BASE	 (dev->base_addr)
#define NE_CMD	 	0x00
#define NE_DATAPORT	0x10	/* NatSemi-defined port window offset. */
#define NE_RESET	0x20	/* Issue a read to reset, a write to clear. */
#define NE_IO_EXTENT	0x30

#define NE1SM_START_PG	0x20	/* First page of TX buffer */
#define NE1SM_STOP_PG 	0x40	/* Last page +1 of RX ring */
#define NESM_START_PG	0x40	/* First page of TX buffer */
#define NESM_STOP_PG	0x80	/* Last page +1 of RX ring */

/* From the .ADF file: */
static unsigned int addresses[7]=
		{0x1000, 0x2020, 0x8020, 0xa0a0, 0xb0b0, 0xc0c0, 0xc3d0};
static int irqs[4] = {3, 4, 5, 9};

struct ne2_adapters_t {
	unsigned int	id;
	char		*name;
};

const struct ne2_adapters_t ne2_adapters[] = {
	{ 0x6354, "Arco Ethernet Adapter AE/2" },
	{ 0x70DE, "Compex ENET-16 MC/P" },
	{ 0x7154, "Novell Ethernet Adapter NE/2" },
	{ 0x0000, NULL }
};

extern int netcard_probe(struct device *dev);

static int ne2_probe1(struct device *dev, int slot);

static int ne_open(struct device *dev);
static int ne_close(struct device *dev);

static void ne_reset_8390(struct device *dev);
static void ne_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr,
		int ring_page);
static void ne_block_input(struct device *dev, int count,
		struct sk_buff *skb, int ring_offset);
static void ne_block_output(struct device *dev, const int count,
		const unsigned char *buf, const int start_page);


/*
 * Note that at boot, this probe only picks up one card at a time.
 */

__initfunc (int ne2_probe(struct device *dev))
{
	static int current_mca_slot = -1;
	int i;
	int adapter_found = 0;

	/* Do not check any supplied i/o locations. 
	   POS registers usually don't fail :) */

	/* MCA cards have POS registers.  
	   Autodetecting MCA cards is extremely simple. 
	   Just search for the card. */

	for(i = 0; (ne2_adapters[i].name != NULL) && !adapter_found; i++) {
		current_mca_slot = 
			mca_find_unused_adapter(ne2_adapters[i].id, 0);

		if((current_mca_slot != MCA_NOTFOUND) && !adapter_found) {
			mca_set_adapter_name(current_mca_slot, 
					ne2_adapters[i].name);
			mca_mark_as_used(current_mca_slot);
			
			return ne2_probe1(dev, current_mca_slot);
		}
	}
	return ENODEV;
}


static int ne2_procinfo(char *buf, int slot, struct device *dev)
{
	int len=0;

	len += sprintf(buf+len, "The NE/2 Ethernet Adapter\n" );
	len += sprintf(buf+len, "Driver written by Wim Dumon ");
	len += sprintf(buf+len, "<[e-mail]>\n"); 
	len += sprintf(buf+len, "Modified by ");
	len += sprintf(buf+len, "David Weinehall <[e-mail]>\n");
	len += sprintf(buf+len, "and by Magnus Jonsson <[e-mail]>\n");
	len += sprintf(buf+len, "Based on the original NE2000 drivers\n" );
	len += sprintf(buf+len, "Base IO: %#x\n", (unsigned int)dev->base_addr);
	len += sprintf(buf+len, "IRQ    : %d\n", dev->irq);

#define HW_ADDR(i) dev->dev_addr[i]
	len += sprintf(buf+len, "HW addr : %x:%x:%x:%x:%x:%x\n", 
			HW_ADDR(0), HW_ADDR(1), HW_ADDR(2), 
			HW_ADDR(3), HW_ADDR(4), HW_ADDR(5) );
#undef HW_ADDR

	return len;
}


__initfunc (static int ne2_probe1(struct device *dev, int slot))
{
	int i, base_addr, irq;
	unsigned char POS;
	unsigned char SA_prom[32];
	const char *name = "NE/2";
	int start_page, stop_page;
	static unsigned version_printed = 0;

	/* We should have a "dev" from Space.c or the static module table. */
	if (dev == NULL) {
		printk(KERN_ERR "ne2.c: Passed a NULL device.\n");
		dev = init_etherdev(0, 0);
	}

	if (ei_debug && version_printed++ == 0)
		printk(version);

	printk("NE/2 ethercard found in slot %d:", slot);

	/* Read base IO and IRQ from the POS-registers */
	POS = mca_read_stored_pos(slot, 2);
	if(!(POS % 2)) {
		printk(" disabled.\n");
		return ENODEV;
	}

	i = (POS & 0xE)>>1;
	/* printk("Halleluja sdog, als er na de pijl een 1 staat is 1 - 1 == 0"
	   " en zou het moeten werken -> %d\n", i);
	   The above line was for remote testing, thanx to sdog ... */
	base_addr = addresses[i - 1];
	irq = irqs[(POS & 0x60)>>5];

#ifdef DEBUG
	printk("POS info : pos 2 = %#x ; base = %#x ; irq = %ld\n", POS,
			base_addr, irq);
#endif

#ifndef CRYNWR_WAY
	/* Reset the card the way they do it in the Crynwr packet driver */
	for (i=0; i<8; i++) 
		outb(0x0, base_addr + NE_RESET);
	inb(base_addr + NE_RESET);
	outb(0x21, base_addr + NE_CMD);
	if (inb(base_addr + NE_CMD) != 0x21) {
		printk("NE/2 adapter not responding\n");
		return ENODEV;
	}

	/* In the crynwr sources they do a RAM-test here. I skip it. I suppose
	   my RAM is okay.  Suppose your memory is broken.  Then this test
	   should fail and you won't be able to use your card.  But if I do not
	   test, you won't be able to use your card, neither.  So this test
	   won't help you. */

#else  /* _I_ never tested it this way .. Go ahead and try ...*/
	/* Reset card. Who knows what dain-bramaged state it was left in. */
	{ 
		unsigned long reset_start_time = jiffies;

		/* DON'T change these to inb_p/outb_p or reset will fail on 
		   clones.. */
		outb(inb(base_addr + NE_RESET), base_addr + NE_RESET);

		while ((inb_p(base_addr + EN0_ISR) & ENISR_RESET) == 0)
			if (jiffies - reset_start_time > 2*HZ/100) {
				printk(" not found (no reset ack).\n");
				return ENODEV;
			}

		outb_p(0xff, base_addr + EN0_ISR);         /* Ack all intr. */
	}
#endif


	/* Read the 16 bytes of station address PROM.
	   We must first initialize registers, similar to 
	   NS8390_init(eifdev, 0).
	   We can't reliably read the SAPROM address without this.
	   (I learned the hard way!). */
	{
		struct { 
			unsigned char value, offset; 
		} program_seq[] = {
						/* Select page 0 */
			{E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD}, 
			{0x49,	EN0_DCFG},  /* Set WORD-wide (0x49) access. */
			{0x00,	EN0_RCNTLO},  /* Clear the count regs. */
			{0x00,	EN0_RCNTHI},
			{0x00,	EN0_IMR},  /* Mask completion irq. */
			{0xFF,	EN0_ISR},
			{E8390_RXOFF, EN0_RXCR},  /* 0x20  Set to monitor */
			{E8390_TXOFF, EN0_TXCR},  /* 0x02  and loopback mode. */
			{32,	EN0_RCNTLO},
			{0x00,	EN0_RCNTHI},
			{0x00,	EN0_RSARLO},  /* DMA starting at 0x0000. */
			{0x00,	EN0_RSARHI},
			{E8390_RREAD+E8390_START, E8390_CMD},
		};

		for (i = 0; i < sizeof(program_seq)/sizeof(program_seq[0]); i++)
			outb_p(program_seq[i].value, base_addr + 
				program_seq[i].offset);

	}
	for(i = 0; i < 6 /*sizeof(SA_prom)*/; i+=1) {
		SA_prom[i] = inb(base_addr + NE_DATAPORT);
	}

	start_page = NESM_START_PG;
	stop_page = NESM_STOP_PG;

	dev->irq=irq;

	/* Snarf the interrupt now.  There's no point in waiting since we cannot
	   share and the board will usually be enabled. */
	{
		int irqval = request_irq(dev->irq, ei_interrupt, 
				0, name, dev);
		if (irqval) {
			printk (" unable to get IRQ %d (irqval=%d).\n", 
					dev->irq, +irqval);
			return EAGAIN;
		}
	}

	dev->base_addr = base_addr;

	/* Allocate dev->priv and fill in 8390 specific dev fields. */
	if (ethdev_init(dev)) {
		printk (" unable to get memory for dev->priv.\n");
		free_irq(dev->irq, dev);
		return -ENOMEM;
	}

	request_region(base_addr, NE_IO_EXTENT, name);

	for(i = 0; i < ETHER_ADDR_LEN; i++) {
		printk(" %2.2x", SA_prom[i]);
		dev->dev_addr[i] = SA_prom[i];
	}

	printk("\n%s: %s found at %#x, using IRQ %d.\n",
			dev->name, name, base_addr, dev->irq);

	mca_set_adapter_procfn(slot, (MCA_ProcFn) ne2_procinfo, dev);