Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 665 insertions, 0 deletions

diff --git a/drivers/net/oaknet.c b/drivers/net/oaknet.c
new file mode 100644
index 000000000000..62167a29debe
--- /dev/null
+++ b/drivers/net/oaknet.c
@@ -0,0 +1,665 @@
+/*
+ *
+ *    Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
+ *
+ *    Module name: oaknet.c
+ *
+ *    Description:
+ *      Driver for the National Semiconductor DP83902AV Ethernet controller
+ *      on-board the IBM PowerPC "Oak" evaluation board. Adapted from the
+ *      various other 8390 drivers written by Donald Becker and Paul Gortmaker.
+ *
+ *      Additional inspiration from the "tcd8390.c" driver from TiVo, Inc. 
+ *      and "enetLib.c" from IBM.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/init.h>
+
+#include <asm/board.h>
+#include <asm/io.h>
+
+#include "8390.h"
+
+
+/* Preprocessor Defines */
+
+#if !defined(TRUE) || TRUE != 1
+#define	TRUE	1
+#endif
+
+#if !defined(FALSE) || FALSE != 0
+#define	FALSE	0
+#endif
+
+#define	OAKNET_START_PG		0x20	/* First page of TX buffer */
+#define	OAKNET_STOP_PG		0x40	/* Last pagge +1 of RX ring */
+
+#define	OAKNET_WAIT		(2 * HZ / 100)	/* 20 ms */
+
+/* Experimenting with some fixes for a broken driver... */
+
+#define	OAKNET_DISINT
+#define	OAKNET_HEADCHECK
+#define	OAKNET_RWFIX
+
+
+/* Global Variables */
+
+static const char *name = "National DP83902AV";
+
+static struct net_device *oaknet_devs;
+
+
+/* Function Prototypes */
+
+static int	 oaknet_open(struct net_device *dev);
+static int	 oaknet_close(struct net_device *dev);
+
+static void	 oaknet_reset_8390(struct net_device *dev);
+static void	 oaknet_get_8390_hdr(struct net_device *dev,
+				     struct e8390_pkt_hdr *hdr, int ring_page);
+static void	 oaknet_block_input(struct net_device *dev, int count,
+				    struct sk_buff *skb, int ring_offset);
+static void	 oaknet_block_output(struct net_device *dev, int count,
+				     const unsigned char *buf, int start_page);
+
+static void	 oaknet_dma_error(struct net_device *dev, const char *name);
+
+
+/*
+ * int oaknet_init()
+ *
+ * Description:
+ *   This routine performs all the necessary platform-specific initiali-
+ *   zation and set-up for the IBM "Oak" evaluation board's National
+ *   Semiconductor DP83902AV "ST-NIC" Ethernet controller.
+ *
+ * Input(s):
+ *   N/A
+ *
+ * Output(s):
+ *   N/A
+ *
+ * Returns:
+ *   0 if OK, otherwise system error number on error.
+ *
+ */
+static int __init oaknet_init(void)
+{
+	register int i;
+	int reg0, regd;
+	int ret = -ENOMEM;
+	struct net_device *dev;
+#if 0
+	unsigned long ioaddr = OAKNET_IO_BASE; 
+#else
+	unsigned long ioaddr = ioremap(OAKNET_IO_BASE, OAKNET_IO_SIZE);
+#endif
+	bd_t *bip = (bd_t *)__res;
+
+	if (!ioaddr)
+		return -ENOMEM;
+
+	dev = alloc_ei_netdev();
+	if (!dev)
+		goto out_unmap;
+
+	ret = -EBUSY;
+	if (!request_region(OAKNET_IO_BASE, OAKNET_IO_SIZE, name))
+		goto out_dev;
+
+	/* Quick register check to see if the device is really there. */
+
+	ret = -ENODEV;
+	if ((reg0 = ei_ibp(ioaddr)) == 0xFF)
+		goto out_region;
+
+	/*
+	 * That worked. Now a more thorough check, using the multicast
+	 * address registers, that the device is definitely out there
+	 * and semi-functional.
+	 */
+
+	ei_obp(E8390_NODMA + E8390_PAGE1 + E8390_STOP, ioaddr + E8390_CMD);
+	regd = ei_ibp(ioaddr + 0x0D);
+	ei_obp(0xFF, ioaddr + 0x0D);
+	ei_obp(E8390_NODMA + E8390_PAGE0, ioaddr + E8390_CMD);
+	ei_ibp(ioaddr + EN0_COUNTER0);
+
+	/* It's no good. Fix things back up and leave. */
+
+	ret = -ENODEV;
+	if (ei_ibp(ioaddr + EN0_COUNTER0) != 0) {
+		ei_obp(reg0, ioaddr);
+		ei_obp(regd, ioaddr + 0x0D);
+		goto out_region;
+	}
+
+	SET_MODULE_OWNER(dev);
+
+	/*
+	 * This controller is on an embedded board, so the base address
+	 * and interrupt assignments are pre-assigned and unchageable.
+	 */
+
+	dev->base_addr = ioaddr;
+	dev->irq = OAKNET_INT;
+
+	/*
+	 * Disable all chip interrupts for now and ACK all pending
+	 * interrupts.
+	 */
+
+	ei_obp(0x0, ioaddr + EN0_IMR);
+	ei_obp(0xFF, ioaddr + EN0_ISR);
+
+	/* Attempt to get the interrupt line */
+
+	ret = -EAGAIN;
+	if (request_irq(dev->irq, ei_interrupt, 0, name, dev)) {
+		printk("%s: unable to request interrupt %d.\n",
+		       name, dev->irq);
+		goto out_region;
+	}
+
+	/* Tell the world about what and where we've found. */
+
+	printk("%s: %s at", dev->name, name);
+	for (i = 0; i < ETHER_ADDR_LEN; ++i) {
+		dev->dev_addr[i] = bip->bi_enetaddr[i];
+		printk("%c%.2x", (i ? ':' : ' '), dev->dev_addr[i]);
+	}
+	printk(", found at %#lx, using IRQ %d.\n", dev->base_addr, dev->irq);
+
+	/* Set up some required driver fields and then we're done. */
+
+	ei_status.name		= name;
+	ei_status.word16	= FALSE;
+	ei_status.tx_start_page	= OAKNET_START_PG;
+	ei_status.rx_start_page = OAKNET_START_PG + TX_PAGES;
+	ei_status.stop_page	= OAKNET_STOP_PG;
+
+	ei_status.reset_8390	= &oaknet_reset_8390;
+	ei_status.block_input	= &oaknet_block_input;
+	ei_status.block_output	= &oaknet_block_output;
+	ei_status.get_8390_hdr	= &oaknet_get_8390_hdr;
+
+	dev->open = oaknet_open;
+	dev->stop = oaknet_close;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller = ei_poll;
+#endif
+
+	NS8390_init(dev, FALSE);
+	ret = register_netdev(dev);
+	if (ret)
+		goto out_irq;
+	
+	oaknet_devs = dev;
+	return 0;
+
+out_irq;
+	free_irq(dev->irq, dev);
+out_region:
+	release_region(OAKNET_IO_BASE, OAKNET_IO_SIZE);
+out_dev:
+	free_netdev(dev);
+out_unmap:
+	iounmap(ioaddr);
+	return ret;
+}
+
+/*
+ * static int oaknet_open()
+ *
+ * Description:
+ *   This routine is a modest wrapper around ei_open, the 8390-generic,
+ *   driver open routine. This just increments the module usage count
+ *   and passes along the status from ei_open.
+ *
+ * Input(s):
+ *  *dev - Pointer to the device structure for this driver.
+ *
+ * Output(s):
+ *  *dev - Pointer to the device structure for this driver, potentially
+ *         modified by ei_open.
+ *
+ * Returns:
+ *   0 if OK, otherwise < 0 on error.
+ *
+ */
+static int
+oaknet_open(struct net_device *dev)
+{
+	int status = ei_open(dev);
+	return (status);
+}
+
+/*
+ * static int oaknet_close()
+ *
+ * Description:
+ *   This routine is a modest wrapper around ei_close, the 8390-generic,
+ *   driver close routine. This just decrements the module usage count
+ *   and passes along the status from ei_close.
+ *
+ * Input(s):
+ *  *dev - Pointer to the device structure for this driver.
+ *
+ * Output(s):
+ *  *dev - Pointer to the device structure for this driver, potentially
+ *         modified by ei_close.
+ *
+ * Returns:
+ *   0 if OK, otherwise < 0 on error.
+ *
+ */
+static int
+oaknet_close(struct net_device *dev)
+{
+	int status = ei_close(dev);
+	return (status);
+}
+
+/*
+ * static void oaknet_reset_8390()
+ *
+ * Description:
+ *   This routine resets the DP83902 chip.
+ *
+ * Input(s):
+ *  *dev - Pointer to the device structure for this driver.
+ *
+ * Output(s):
+ *   N/A
+ *
+ * Returns:
+ *   N/A
+ *
+ */
+static void
+oaknet_reset_8390(struct net_device *dev)
+{
+	int base = E8390_BASE;
+
+	/*
+	 * We have no provision of reseting the controller as is done
+	 * in other drivers, such as "ne.c". However, the following
+	 * seems to work well enough in the TiVo driver.
+	 */
+
+	printk("Resetting %s...\n", dev->name);
+	ei_obp(E8390_STOP | E8390_NODMA | E8390_PAGE0, base + E8390_CMD);
+	ei_status.txing = 0;
+	ei_status.dmaing = 0;
+}
+
+/*
+ * static void oaknet_get_8390_hdr()
+ *
+ * Description:
+ *   This routine grabs the 8390-specific header. It's 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.
+ *
+ * Input(s):
+ *  *dev       - Pointer to the device structure for this driver.
+ *  *hdr       - Pointer to storage for the 8390-specific packet header.
+ *   ring_page - ?
+ *
+ * Output(s):
+ *  *hdr       - Pointer to the 8390-specific packet header for the just-
+ *               received frame.
+ *
+ * Returns:
+ *   N/A
+ *
+ */
+static void
+oaknet_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
+		    int ring_page)
+{
+	int base = dev->base_addr;
+
+	/*
+	 * This should NOT happen. If it does, it is the LAST thing you'll
+	 * see.
+	 */
+
+	if (ei_status.dmaing) {
+		oaknet_dma_error(dev, "oaknet_get_8390_hdr");
+		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 unload interface.
+ */
+static void __exit oaknet_cleanup_module (void)
+{
+	/* Convert to loop once driver supports multiple devices. */
+	unregister_netdev(oaknet_dev);
+	free_irq(oaknet_devs->irq, oaknet_devs);
+	release_region(oaknet_devs->base_addr, OAKNET_IO_SIZE);
+	iounmap(ioaddr);
+	free_netdev(oaknet_devs);
+}
+
+module_init(oaknet_init);
+module_exit(oaknet_cleanup_module);
+MODULE_LICENSE("GPL");