oaknet.c

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		return;
	}

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

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

	/* Byte-swap the packet byte count */

	hdr->count = le16_to_cpu(hdr->count);

	outb_p(ENISR_RDC, base + EN0_ISR);	/* ACK Remote DMA interrupt */
	ei_status.dmaing &= ~0x01;
}

/*
 * XXX - Document me.
 */
static void
oaknet_block_input(struct net_device *dev, int count, struct sk_buff *skb,
		   int ring_offset)
{
	int base = OAKNET_BASE;
	char *buf = skb->data;

	/*
	 * This should NOT happen. If it does, it is the LAST thing you'll
	 * see.
	 */

	if (ei_status.dmaing) {
		oaknet_dma_error(dev, "oaknet_block_input");
		return;
	}

#ifdef OAKNET_DISINT
	save_flags(flags);
	cli();
#endif

	ei_status.dmaing |= 0x01;
	ei_obp(E8390_NODMA + E8390_PAGE0 + E8390_START, base + E8390_CMD);
	ei_obp(count & 0xff, base + EN0_RCNTLO);
	ei_obp(count >> 8, base + EN0_RCNTHI);
	ei_obp(ring_offset & 0xff, base + EN0_RSARLO);
	ei_obp(ring_offset >> 8, base + EN0_RSARHI);
	ei_obp(E8390_RREAD + E8390_START, base + E8390_CMD);
	if (ei_status.word16) {
		ei_isw(base + E8390_DATA, buf, count >> 1);
		if (count & 0x01) {
			buf[count - 1] = ei_ib(base + E8390_DATA);
#ifdef OAKNET_HEADCHECK
			bytes++;
#endif
		}
	} else {
		ei_isb(base + E8390_DATA, buf, count);
	}
#ifdef OAKNET_HEADCHECK
	/*
	 * 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.
	 */

	/* DMA termination address check... */
	{
		int addr, tries = 20;
		do {
			/* DON'T check for 'ei_ibp(EN0_ISR) & ENISR_RDC' here
			   -- it's broken for Rx on some cards! */
			int high = ei_ibp(base + EN0_RSARHI);
			int low = ei_ibp(base + EN0_RSARLO);
			addr = (high << 8) + low;
			if (((ring_offset + bytes) & 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 + bytes, addr);
	}
#endif
	ei_obp(ENISR_RDC, base + EN0_ISR);	/* ACK Remote DMA interrupt */
	ei_status.dmaing &= ~0x01;

#ifdef OAKNET_DISINT
	restore_flags(flags);
#endif
}

/*
 * static void oaknet_block_output()
 *
 * Description:
 *   This routine...
 *
 * Input(s):
 *  *dev        - Pointer to the device structure for this driver.
 *   count      - Number of bytes to be transferred.
 *  *buf        - 
 *   start_page - 
 *
 * Output(s):
 *   N/A
 *
 * Returns:
 *   N/A
 *
 */
static void
oaknet_block_output(struct net_device *dev, int count,
		    const unsigned char *buf, int start_page)
{
	int base = E8390_BASE;
#if 0
	int bug;
#endif
	unsigned long start;
#ifdef OAKNET_DISINT
	unsigned long flags;
#endif
#ifdef OAKNET_HEADCHECK
	int retries = 0;
#endif

	/* Round the count up for word writes. */

	if (ei_status.word16 && (count & 0x1))
		count++;

	/*
	 * This should NOT happen. If it does, it is the LAST thing you'll
	 * see.
	 */

	if (ei_status.dmaing) {
		oaknet_dma_error(dev, "oaknet_block_output");
		return;
	}

#ifdef OAKNET_DISINT
	save_flags(flags);
	cli();
#endif

	ei_status.dmaing |= 0x01;

	/* Make sure we are in page 0. */

	ei_obp(E8390_PAGE0 + E8390_START + E8390_NODMA, base + E8390_CMD);

#ifdef OAKNET_HEADCHECK
retry:
#endif

#if 0
	/*
	 * The 83902 documentation states that the processor needs to
	 * do a "dummy read" before doing the remote write to work
	 * around a chip bug they don't feel like fixing.
	 */

	bug = 0;
	while (1) {
		unsigned int rdhi;
		unsigned int rdlo;

		/* Now the normal output. */
		ei_obp(ENISR_RDC, base + EN0_ISR);
		ei_obp(count & 0xff, base + EN0_RCNTLO);
		ei_obp(count >> 8,   base + EN0_RCNTHI);
		ei_obp(0x00, base + EN0_RSARLO);
		ei_obp(start_page, base + EN0_RSARHI);

		if (bug++)
			break;

		/* Perform the dummy read */
		rdhi = ei_ibp(base + EN0_CRDAHI);
		rdlo = ei_ibp(base + EN0_CRDALO);
		ei_obp(E8390_RREAD + E8390_START, base + E8390_CMD);

		while (1) {
			unsigned int nrdhi;
			unsigned int nrdlo;
			nrdhi = ei_ibp(base + EN0_CRDAHI);
			nrdlo = ei_ibp(base + EN0_CRDALO);
			if ((rdhi != nrdhi) || (rdlo != nrdlo))
				break;
		}
	}
#else
#ifdef OAKNET_RWFIX
	/*
	 * Handle the read-before-write bug the same way as the
	 * Crynwr packet driver -- the Nat'l Semi. method doesn't work.
	 * Actually this doesn't always work either, but if you have
	 * problems with your 83902 this is better than nothing!
	 */

	ei_obp(0x42, base + EN0_RCNTLO);
	ei_obp(0x00, base + EN0_RCNTHI);
	ei_obp(0x42, base + EN0_RSARLO);
	ei_obp(0x00, base + EN0_RSARHI);
	ei_obp(E8390_RREAD + E8390_START, base + E8390_CMD);
	/* Make certain that the dummy read has occurred. */
	udelay(6);
#endif

	ei_obp(ENISR_RDC, base + EN0_ISR);

	/* Now the normal output. */
	ei_obp(count & 0xff, base + EN0_RCNTLO);
	ei_obp(count >> 8,   base + EN0_RCNTHI);
	ei_obp(0x00, base + EN0_RSARLO);
	ei_obp(start_page, base + EN0_RSARHI);
#endif /* 0/1 */

	ei_obp(E8390_RWRITE + E8390_START, base + E8390_CMD);
	if (ei_status.word16) {
		ei_osw(E8390_BASE + E8390_DATA, buf, count >> 1);
	} else {
		ei_osb(E8390_BASE + E8390_DATA, buf, count);
	}

#ifdef OAKNET_DISINT
	restore_flags(flags);
#endif

	start = jiffies;

#ifdef OAKNET_HEADCHECK
	/*
	 * This was for the ALPHA version only, but enough people have
	 * been encountering problems so it is still here.
	 */
	
	{
		/* DMA termination address check... */
		int addr, tries = 20;
		do {
			int high = ei_ibp(base + EN0_RSARHI);
			int low = ei_ibp(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 ((ei_ibp(base + EN0_ISR) & ENISR_RDC) == 0) {
		if (jiffies - start > OAKNET_WAIT) {
			printk("%s: timeout waiting for Tx RDC.\n", dev->name);
			oaknet_reset_8390(dev);
			NS8390_init(dev, TRUE);
			break;
		}
	}
	
	ei_obp(ENISR_RDC, base + EN0_ISR);	/* Ack intr. */
	ei_status.dmaing &= ~0x01;
}

/*
 * static void oaknet_dma_error()
 *
 * Description:
 *   This routine prints out a last-ditch informative message to the console
 *   indicating that a DMA error occurred. If you see this, it's the last
 *   thing you'll see.
 *
 * Input(s):
 *  *dev  - Pointer to the device structure for this driver.
 *  *name - Informative text (e.g. function name) indicating where the
 *          DMA error occurred.
 *
 * Output(s):
 *   N/A
 *
 * Returns:
 *   N/A
 *
 */
static void
oaknet_dma_error(struct net_device *dev, const char *name)
{
	printk(KERN_EMERG "%s: DMAing conflict in %s."
	       "[DMAstat:%d][irqlock:%d][intr:%ld]\n",
	       dev->name, name, ei_status.dmaing, ei_status.irqlock,
	       dev->interrupt);
}

/*
 * Oak Ethernet module load interface.
 */
static int __init oaknet_init_module (void)
{
	if (oaknet_devs != NULL)
		return (-EBUSY);

	return (oaknet_init());
}

/*
 * Oak Ethernet module unload interface.
 */
static void __exit oaknet_cleanup_module (void)
{
	if (oaknet_devs == NULL)
		return;

	if (oaknet_devs->priv != NULL) {
		int ioaddr = oaknet_devs->base_addr;
		void *priv = oaknet_devs->priv;
		free_irq(oaknet_devs->irq, oaknet_devs);
		release_region(ioaddr, OAKNET_IO_SIZE);
		iounmap(ioaddr);
		unregister_netdev(oaknet_dev);
		kfree(priv);
	}

	/* Convert to loop once driver supports multiple devices. */
	kfree(oaknet_devs);
}

module_init(oaknet_init_module);
module_exit(oaknet_cleanup_module);
MODULE_LICENSE("GPL");