ne2k-pci.c

嵌入式系统的TCP/IP源代码

			}
		
		outb(0xff, ioaddr + EN0_ISR);		/* Ack all intr. */
	}

	if (load_8390_module("ne2k-pci.c")) {
		return 0;
	}

	/* 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[] = {
			{E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD}, /* Select page 0*/
			{0x49,	EN0_DCFG},	/* Set word-wide 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(program_seq[i].value, ioaddr + program_seq[i].offset);

	}

	/* Note: all PCI cards have at least 16 bit access, so we don't have
	   to check for 8 bit cards.  Most cards permit 32 bit access. */
	if (pci_clone_list[chip_idx].flags & ONLY_32BIT_IO) {
		for (i = 0; i < 4 ; i++)
			((u32 *)SA_prom)[i] = le32_to_cpu(inl(ioaddr + NE_DATAPORT));
	} else
		for(i = 0; i < 32 /*sizeof(SA_prom)*/; i++)
			SA_prom[i] = inb(ioaddr + NE_DATAPORT);

	/* We always set the 8390 registers for word mode. */
	outb(0x49, ioaddr + EN0_DCFG);
	start_page = NESM_START_PG;

	stop_page =
		pci_clone_list[chip_idx].flags&STOP_PG_0x60 ? 0x60 : NESM_STOP_PG;

	/* Set up the rest of the parameters. */
	dev->irq = irq;
	dev->base_addr = ioaddr;

	/* Allocate dev->priv and fill in 8390 specific dev fields. */
	if (ethdev_init(dev)) {
		printk ("%s: unable to get memory for dev->priv.\n", dev->name);
		return 0;
	}

	request_region(ioaddr, NE_IO_EXTENT, dev->name);

	printk("%s: %s found at %#lx, IRQ %d, ",
		   dev->name, pci_clone_list[chip_idx].name, ioaddr, dev->irq);
	for(i = 0; i < 6; i++) {
		printk("%2.2X%s", SA_prom[i], i == 5 ? ".\n": ":");
		dev->dev_addr[i] = SA_prom[i];
	}

	ei_status.name = pci_clone_list[chip_idx].name;
	ei_status.tx_start_page = start_page;
	ei_status.stop_page = stop_page;
	ei_status.word16 = 1;
	ei_status.ne2k_flags = pci_clone_list[chip_idx].flags;

	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 = &ne2k_pci_reset_8390;
	ei_status.block_input = &ne2k_pci_block_input;
	ei_status.block_output = &ne2k_pci_block_output;
	ei_status.get_8390_hdr = &ne2k_pci_get_8390_hdr;
	dev->open = &ne2k_pci_open;
	dev->stop = &ne2k_pci_close;
	NS8390_init(dev, 0);
	return dev;
}

static int
ne2k_pci_open(struct device *dev)
{
	if (request_irq(dev->irq, ei_interrupt, SA_SHIRQ, dev->name, dev))
		return -EAGAIN;
	ei_open(dev);
	MOD_INC_USE_COUNT;
	return 0;
}

static int
ne2k_pci_close(struct device *dev)
{
	ei_close(dev);
	free_irq(dev->irq, 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
ne2k_pci_reset_8390(struct device *dev)
{
	unsigned long reset_start_time = jiffies;

	if (debug > 1) printk("%s: Resetting the 8390 t=%ld...",
						  dev->name, jiffies);

	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(NE_BASE+EN0_ISR) & ENISR_RESET) == 0)
		if (jiffies - reset_start_time > 2) {
			printk("%s: ne2k_pci_reset_8390() did not complete.\n", dev->name);
			break;
		}
	outb(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
ne2k_pci_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
{

	long 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 ne2k_pci_get_8390_hdr "
			   "[DMAstat:%d][irqlock:%d][intr:%d].\n",
			   dev->name, ei_status.dmaing, ei_status.irqlock,
			   (int)dev->interrupt);
		return;
	}

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

	if (ei_status.ne2k_flags & ONLY_16BIT_IO) {
		insw(NE_BASE + NE_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
	} else {
		*(u32*)hdr = le32_to_cpu(inl(NE_BASE + NE_DATAPORT));
		le16_to_cpus(&hdr->count);
	}

	outb(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
ne2k_pci_block_input(struct device *dev, int count, struct sk_buff *skb, int ring_offset)
{
	long 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 ne2k_pci_block_input "
			   "[DMAstat:%d][irqlock:%d][intr:%d].\n",
			   dev->name, ei_status.dmaing, ei_status.irqlock,
			   (int)dev->interrupt);
		return;
	}
	ei_status.dmaing |= 0x01;
	if (ei_status.ne2k_flags & ONLY_32BIT_IO)
		count = (count + 3) & 0xFFFC;
	outb(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
	outb(count & 0xff, nic_base + EN0_RCNTLO);
	outb(count >> 8, nic_base + EN0_RCNTHI);
	outb(ring_offset & 0xff, nic_base + EN0_RSARLO);
	outb(ring_offset >> 8, nic_base + EN0_RSARHI);
	outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);

	if (ei_status.ne2k_flags & ONLY_16BIT_IO) {
		insw(NE_BASE + NE_DATAPORT,buf,count>>1);
		if (count & 0x01) {
			buf[count-1] = inb(NE_BASE + NE_DATAPORT);
		}
	} else {
		insl(NE_BASE + NE_DATAPORT, buf, count>>2);
		if (count & 3) {
			buf += count & ~3;
			if (count & 2)
				*((u16*)buf)++ = le16_to_cpu(inw(NE_BASE + NE_DATAPORT));
			if (count & 1)
				*buf = inb(NE_BASE + NE_DATAPORT);
		}
	}

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

static void
ne2k_pci_block_output(struct device *dev, int count,
		const unsigned char *buf, const int start_page)
{
	long nic_base = NE_BASE;
	unsigned long dma_start;

	/* On little-endian it's always safe to round the count up for
	   word writes. */
	if (ei_status.ne2k_flags & ONLY_32BIT_IO)
		count = (count + 3) & 0xFFFC;
	else
		if (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 ne2k_pci_block_output."
			   "[DMAstat:%d][irqlock:%d][intr:%d]\n",
			   dev->name, ei_status.dmaing, ei_status.irqlock,
			   (int)dev->interrupt);
		return;
	}
	ei_status.dmaing |= 0x01;
	/* We should already be in page 0, but to be safe... */
	outb(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base + NE_CMD);

#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(0x42, nic_base + EN0_RCNTLO);
	outb(0x00, nic_base + EN0_RCNTHI);
	outb(0x42, nic_base + EN0_RSARLO);
	outb(0x00, nic_base + EN0_RSARHI);
	outb(E8390_RREAD+E8390_START, nic_base + NE_CMD);
#endif
	outb(ENISR_RDC, nic_base + EN0_ISR);

   /* Now the normal output. */
	outb(count & 0xff, nic_base + EN0_RCNTLO);
	outb(count >> 8,   nic_base + EN0_RCNTHI);
	outb(0x00, nic_base + EN0_RSARLO);
	outb(start_page, nic_base + EN0_RSARHI);
	outb(E8390_RWRITE+E8390_START, nic_base + NE_CMD);
	if (ei_status.ne2k_flags & ONLY_16BIT_IO) {
		outsw(NE_BASE + NE_DATAPORT, buf, count>>1);
	} else {
		outsl(NE_BASE + NE_DATAPORT, buf, count>>2);
		if (count & 3) {
			buf += count & ~3;
			if (count & 2)
				outw(cpu_to_le16(*((u16*)buf)++), NE_BASE + NE_DATAPORT);
		}
	}

	dma_start = jiffies;

	while ((inb(nic_base + EN0_ISR) & ENISR_RDC) == 0)
		if (jiffies - dma_start > 2) { 			/* Avoid clock roll-over. */
			printk("%s: timeout waiting for Tx RDC.\n", dev->name);
			ne2k_pci_reset_8390(dev);
			NS8390_init(dev,1);
			break;
		}

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


/*
 * Local variables:
 *  compile-command: "gcc -DMODVERSIONS  -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer -I/usr/src/linux/drivers/net/ -c ne2k-pci.c"
 *  alt-compile-command: "gcc -DMODULE -D__KERNEL__ -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer -I/usr/src/linux/drivers/net/ -c ne2k-pci.c"
 *  c-indent-level: 4
 *  c-basic-offset: 4
 *  tab-width: 4
 *  version-control: t
 *  kept-new-versions: 5
 * End:
 */