ne2.c

嵌入式系统的TCP/IP源代码

	ei_status.name = name;
	ei_status.tx_start_page = start_page;
	ei_status.stop_page = stop_page;
	ei_status.word16 = (2 == 2);

	ei_status.rx_start_page = start_page + TX_PAGES;
#ifdef PACKETBUF_MEMSIZE
	/* Allow the packet buffer size to be overridden by know-it-alls. */
	ei_status.stop_page = ei_status.tx_start_page + PACKETBUF_MEMSIZE;
#endif

	ei_status.reset_8390 = &ne_reset_8390;
	ei_status.block_input = &ne_block_input;
	ei_status.block_output = &ne_block_output;
	ei_status.get_8390_hdr = &ne_get_8390_hdr;
	
	ei_status.priv = slot;
	
	dev->open = &ne_open;
	dev->stop = &ne_close;
	NS8390_init(dev, 0);
	return 0;
}

static int ne_open(struct device *dev)
{
	ei_open(dev);
	MOD_INC_USE_COUNT;
	return 0;
}

static int ne_close(struct device *dev)
{
	if (ei_debug > 1)
		printk("%s: Shutting down ethercard.\n", dev->name);
	ei_close(dev);
	MOD_DEC_USE_COUNT;
	return 0;
}

/* Hard reset the card.  This used to pause for the same period that a
   8390 reset command required, but that shouldn't be necessary. */
static void ne_reset_8390(struct device *dev)
{
	unsigned long reset_start_time = jiffies;

	if (ei_debug > 1) 
		printk("resetting the 8390 t=%ld...", jiffies);

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

	ei_status.txing = 0;
	ei_status.dmaing = 0;

	/* This check _should_not_ be necessary, omit eventually. */
	while ((inb_p(NE_BASE+EN0_ISR) & ENISR_RESET) == 0)
		if (jiffies - reset_start_time > 2*HZ/100) {
			printk("%s: ne_reset_8390() did not complete.\n", 
					dev->name);
			break;
		}
	outb_p(ENISR_RESET, NE_BASE + EN0_ISR);	/* Ack intr. */
}

/* Grab the 8390 specific header. Similar to the block_input routine, but
   we don't need to be concerned with ring wrap as the header will be at
   the start of a page, so we optimize accordingly. */

static void ne_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, 
		int ring_page)
{

	int nic_base = dev->base_addr;

	/* This *shouldn't* happen. 
	   If it does, it's the last thing you'll see */
	if (ei_status.dmaing) {
		printk("%s: DMAing conflict in ne_get_8390_hdr "
				"[DMAstat:%d][irqlock:%d][intr:%ld].\n",
				dev->name, ei_status.dmaing, ei_status.irqlock,
				dev->interrupt);
		return;
	}

	ei_status.dmaing |= 0x01;
	outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
	outb_p(sizeof(struct e8390_pkt_hdr), nic_base + EN0_RCNTLO);
	outb_p(0, nic_base + EN0_RCNTHI);
	outb_p(0, nic_base + EN0_RSARLO);		/* On page boundary */
	outb_p(ring_page, nic_base + EN0_RSARHI);
	outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);

	if (ei_status.word16)
		insw(NE_BASE + NE_DATAPORT, hdr, 
				sizeof(struct e8390_pkt_hdr)>>1);
	else
		insb(NE_BASE + NE_DATAPORT, hdr, 
				sizeof(struct e8390_pkt_hdr));

	outb_p(ENISR_RDC, nic_base + EN0_ISR);	/* Ack intr. */
	ei_status.dmaing &= ~0x01;
}

/* Block input and output, similar to the Crynwr packet driver.  If you
   are porting to a new ethercard, look at the packet driver source for
   hints. The NEx000 doesn't share the on-board packet memory -- you have
   to put the packet out through the "remote DMA" dataport using outb. */

static void ne_block_input(struct device *dev, int count, struct sk_buff *skb, 
		int ring_offset)
{
#ifdef NE_SANITY_CHECK
	int xfer_count = count;
#endif
	int nic_base = dev->base_addr;
	char *buf = skb->data;

	/* This *shouldn't* happen. 
	   If it does, it's the last thing you'll see */
	if (ei_status.dmaing) {
		printk("%s: DMAing conflict in ne_block_input "
				"[DMAstat:%d][irqlock:%d][intr:%ld].\n",
				dev->name, ei_status.dmaing, ei_status.irqlock,
				dev->interrupt);
		return;
	}
	ei_status.dmaing |= 0x01;
	outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
	outb_p(count & 0xff, nic_base + EN0_RCNTLO);
	outb_p(count >> 8, nic_base + EN0_RCNTHI);
	outb_p(ring_offset & 0xff, nic_base + EN0_RSARLO);
	outb_p(ring_offset >> 8, nic_base + EN0_RSARHI);
	outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);
	if (ei_status.word16) {
		insw(NE_BASE + NE_DATAPORT,buf,count>>1);
		if (count & 0x01) {
			buf[count-1] = inb(NE_BASE + NE_DATAPORT);
#ifdef NE_SANITY_CHECK
			xfer_count++;
#endif
		}
	} else {
		insb(NE_BASE + NE_DATAPORT, buf, count);
	}

#ifdef NE_SANITY_CHECK
	/* This was for the ALPHA version only, but enough people have
	   been encountering problems so it is still here.  If you see
	   this message you either 1) have a slightly incompatible clone
	   or 2) have noise/speed problems with your bus. */
	if (ei_debug > 1) {	/* DMA termination address check... */
		int addr, tries = 20;
		do {
			/* DON'T check for 'inb_p(EN0_ISR) & ENISR_RDC' here
			   -- it's broken for Rx on some cards! */
			int high = inb_p(nic_base + EN0_RSARHI);
			int low = inb_p(nic_base + EN0_RSARLO);
			addr = (high << 8) + low;
			if (((ring_offset + xfer_count) & 0xff) == low)
				break;
		} while (--tries > 0);
		if (tries <= 0)
			printk("%s: RX transfer address mismatch,"
				"%#4.4x (expected) vs. %#4.4x (actual).\n",
				dev->name, ring_offset + xfer_count, addr);
	}
#endif
	outb_p(ENISR_RDC, nic_base + EN0_ISR);	/* Ack intr. */
	ei_status.dmaing &= ~0x01;
}

static void ne_block_output(struct device *dev, int count,
		const unsigned char *buf, const int start_page)
{
	int nic_base = NE_BASE;
	unsigned long dma_start;
#ifdef NE_SANITY_CHECK
	int retries = 0;
#endif

	/* Round the count up for word writes. Do we need to do this?
	   What effect will an odd byte count have on the 8390?
	   I should check someday. */
	if (ei_status.word16 && (count & 0x01))
		count++;

	/* This *shouldn't* happen. 
	   If it does, it's the last thing you'll see */
	if (ei_status.dmaing) {
		printk("%s: DMAing conflict in ne_block_output."
				"[DMAstat:%d][irqlock:%d][intr:%ld]\n",
				dev->name, ei_status.dmaing, ei_status.irqlock,
				dev->interrupt);
		return;
	}
	ei_status.dmaing |= 0x01;
	/* We should already be in page 0, but to be safe... */
	outb_p(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base + NE_CMD);

#ifdef NE_SANITY_CHECK
retry:
#endif

#ifdef NE8390_RW_BUGFIX
	/* Handle the read-before-write bug the same way as the
	   Crynwr packet driver -- the NatSemi method doesn't work.
	   Actually this doesn't always work either, but if you have
	   problems with your NEx000 this is better than nothing! */
	outb_p(0x42, nic_base + EN0_RCNTLO);
	outb_p(0x00, nic_base + EN0_RCNTHI);
	outb_p(0x42, nic_base + EN0_RSARLO);
	outb_p(0x00, nic_base + EN0_RSARHI);
	outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);
	/* Make certain that the dummy read has occurred. */
	SLOW_DOWN_IO;
	SLOW_DOWN_IO;
	SLOW_DOWN_IO;
#endif

	outb_p(ENISR_RDC, nic_base + EN0_ISR);

	/* Now the normal output. */
	outb_p(count & 0xff, nic_base + EN0_RCNTLO);
	outb_p(count >> 8,   nic_base + EN0_RCNTHI);
	outb_p(0x00, nic_base + EN0_RSARLO);
	outb_p(start_page, nic_base + EN0_RSARHI);

	outb_p(E8390_RWRITE+E8390_START, nic_base + NE_CMD);
	if (ei_status.word16) {
		outsw(NE_BASE + NE_DATAPORT, buf, count>>1);
	} else {
		outsb(NE_BASE + NE_DATAPORT, buf, count);
	}

	dma_start = jiffies;

#ifdef NE_SANITY_CHECK
	/* This was for the ALPHA version only, but enough people have
	   been encountering problems so it is still here. */

	if (ei_debug > 1) {		/* DMA termination address check... */
		int addr, tries = 20;
		do {
			int high = inb_p(nic_base + EN0_RSARHI);
			int low = inb_p(nic_base + EN0_RSARLO);
			addr = (high << 8) + low;
			if ((start_page << 8) + count == addr)
				break;
		} while (--tries > 0);
		if (tries <= 0) {
			printk("%s: Tx packet transfer address mismatch,"
					"%#4.4x (expected) vs. %#4.4x (actual).\n",
					dev->name, (start_page << 8) + count, addr);
			if (retries++ == 0)
				goto retry;
		}
	}
#endif

	while ((inb_p(nic_base + EN0_ISR) & ENISR_RDC) == 0)
		if (jiffies - dma_start > 2*HZ/100) {		/* 20ms */
			printk("%s: timeout waiting for Tx RDC.\n", dev->name);
			ne_reset_8390(dev);
			NS8390_init(dev,1);
			break;
		}

	outb_p(ENISR_RDC, nic_base + EN0_ISR);	/* Ack intr. */
	ei_status.dmaing &= ~0x01;
	return;
}


#ifdef MODULE
#define MAX_NE_CARDS	4	/* Max number of NE cards per module */
#define NAMELEN		8	/* # of chars for storing dev->name */
static char namelist[NAMELEN * MAX_NE_CARDS] = { 0, };
static struct device dev_ne[MAX_NE_CARDS] = {
	{
		NULL,		/* assign a chunk of namelist[] below */
		0, 0, 0, 0,
		0, 0,
		0, 0, 0, NULL, NULL
	},
};

static int io[MAX_NE_CARDS] = { 0, };
static int irq[MAX_NE_CARDS]  = { 0, };
static int bad[MAX_NE_CARDS]  = { 0, };	/* 0xbad = bad sig or no reset ack */

#ifdef MODULE_PARM
MODULE_PARM(io, "1-" __MODULE_STRING(MAX_NE_CARDS) "i");
MODULE_PARM(irq, "1-" __MODULE_STRING(MAX_NE_CARDS) "i");
MODULE_PARM(bad, "1-" __MODULE_STRING(MAX_NE_CARDS) "i");
#endif

/* Module code fixed by David Weinehall */

int init_module(void)
{
	int this_dev, found = 0;

	for (this_dev = 0; this_dev < MAX_NE_CARDS; this_dev++) {
		struct device *dev = &dev_ne[this_dev];
		dev->name = namelist+(NAMELEN*this_dev);
		dev->irq = irq[this_dev];
		dev->mem_end = bad[this_dev];
		dev->base_addr = io[this_dev];
		dev->init = ne2_probe;
		if (register_netdev(dev) != 0) {
			if (found != 0) return 0;   /* Got at least one. */

			printk(KERN_WARNING "ne2.c: No NE/2 card found.\n");
			return -ENXIO;
		}
		found++;
	}
	return 0;
}

void cleanup_module(void)
{
	int this_dev;

	for (this_dev = 0; this_dev < MAX_NE_CARDS; this_dev++) {
		struct device *dev = &dev_ne[this_dev];
		if (dev->priv != NULL) {
			mca_mark_as_unused(ei_status.priv);
			mca_set_adapter_procfn( ei_status.priv, NULL, NULL);
			kfree(dev->priv);
			free_irq(dev->irq, dev);
			release_region(dev->base_addr, NE_IO_EXTENT);
			unregister_netdev(dev);
		}
	}
}
#endif /* MODULE */

/*
 * Local variables:
 *  compile-command: "gcc -DKERNEL -Wall -O6 -fomit-frame-pointer -I/usr/src/linux/net/tcp -c ne2.c"
 *  version-control: t
 *  kept-new-versions: 5
 * End:
 */