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, 561 insertions, 0 deletions

diff --git a/drivers/net/de600.c b/drivers/net/de600.c
new file mode 100644
index 000000000000..56a100fb9e4b
--- /dev/null
+++ b/drivers/net/de600.c
@@ -0,0 +1,561 @@
+static const char version[] = "de600.c: $Revision: 1.41-2.5 $,  Bjorn Ekwall (bj0rn@blox.se)\n";
+/*
+ *	de600.c
+ *
+ *	Linux driver for the D-Link DE-600 Ethernet pocket adapter.
+ *
+ *	Portions (C) Copyright 1993, 1994 by Bjorn Ekwall
+ *	The Author may be reached as bj0rn@blox.se
+ *
+ *	Based on adapter information gathered from DE600.ASM by D-Link Inc.,
+ *	as included on disk C in the v.2.11 of PC/TCP from FTP Software.
+ *	For DE600.asm:
+ *		Portions (C) Copyright 1990 D-Link, Inc.
+ *		Copyright, 1988-1992, Russell Nelson, Crynwr Software
+ *
+ *	Adapted to the sample network driver core for linux,
+ *	written by: Donald Becker <becker@super.org>
+ *		(Now at <becker@scyld.com>)
+ *
+ **************************************************************/
+/*
+ *	This program is free software; you can redistribute it and/or modify
+ *	it under the terms of the GNU General Public License as published by
+ *	the Free Software Foundation; either version 2, or (at your option)
+ *	any later version.
+ *
+ *	This program is distributed in the hope that it will be useful,
+ *	but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *	GNU General Public License for more details.
+ *
+ *	You should have received a copy of the GNU General Public License
+ *	along with this program; if not, write to the Free Software
+ *	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ **************************************************************/
+
+/* Add more time here if your adapter won't work OK: */
+#define DE600_SLOW_DOWN	udelay(delay_time)
+
+ /*
+ * If you still have trouble reading/writing to the adapter,
+ * modify the following "#define": (see <asm/io.h> for more info)
+#define REALLY_SLOW_IO
+ */
+#define SLOW_IO_BY_JUMPING /* Looks "better" than dummy write to port 0x80 :-) */
+
+/* use 0 for production, 1 for verification, >2 for debug */
+#ifdef DE600_DEBUG
+#define PRINTK(x) if (de600_debug >= 2) printk x
+#else
+#define DE600_DEBUG 0
+#define PRINTK(x) /**/
+#endif
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <asm/system.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+
+#include <asm/io.h>
+
+#include "de600.h"
+
+static unsigned int de600_debug = DE600_DEBUG;
+module_param(de600_debug, int, 0);
+MODULE_PARM_DESC(de600_debug, "DE-600 debug level (0-2)");
+
+static unsigned int check_lost = 1;
+module_param(check_lost, bool, 0);
+MODULE_PARM_DESC(check_lost, "If set then check for unplugged de600");
+
+static unsigned int delay_time = 10;
+module_param(delay_time, int, 0);
+MODULE_PARM_DESC(delay_time, "DE-600 deley on I/O in microseconds");
+
+
+/*
+ * D-Link driver variables:
+ */
+
+static volatile int		rx_page;
+
+#define TX_PAGES 2
+static volatile int		tx_fifo[TX_PAGES];
+static volatile int		tx_fifo_in;
+static volatile int		tx_fifo_out;
+static volatile int		free_tx_pages = TX_PAGES;
+static int			was_down;
+static DEFINE_SPINLOCK(de600_lock);
+
+static inline u8 de600_read_status(struct net_device *dev)
+{
+	u8 status;
+
+	outb_p(STATUS, DATA_PORT);
+	status = inb(STATUS_PORT);
+	outb_p(NULL_COMMAND | HI_NIBBLE, DATA_PORT);
+
+	return status;
+}
+
+static inline u8 de600_read_byte(unsigned char type, struct net_device *dev)
+{
+	/* dev used by macros */
+	u8 lo;
+	outb_p((type), DATA_PORT);
+	lo = ((unsigned char)inb(STATUS_PORT)) >> 4;
+	outb_p((type) | HI_NIBBLE, DATA_PORT);
+	return ((unsigned char)inb(STATUS_PORT) & (unsigned char)0xf0) | lo;
+}
+
+/*
+ * Open/initialize the board.  This is called (in the current kernel)
+ * after booting when 'ifconfig <dev->name> $IP_ADDR' is run (in rc.inet1).
+ *
+ * This routine should set everything up anew at each open, even
+ * registers that "should" only need to be set once at boot, so that
+ * there is a non-reboot way to recover if something goes wrong.
+ */
+
+static int de600_open(struct net_device *dev)
+{
+	unsigned long flags;
+	int ret = request_irq(DE600_IRQ, de600_interrupt, 0, dev->name, dev);
+	if (ret) {
+		printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name, DE600_IRQ);
+		return ret;
+	}
+	spin_lock_irqsave(&de600_lock, flags);
+	ret = adapter_init(dev);
+	spin_unlock_irqrestore(&de600_lock, flags);
+	return ret;
+}
+
+/*
+ * The inverse routine to de600_open().
+ */
+
+static int de600_close(struct net_device *dev)
+{
+	select_nic();
+	rx_page = 0;
+	de600_put_command(RESET);
+	de600_put_command(STOP_RESET);
+	de600_put_command(0);
+	select_prn();
+	free_irq(DE600_IRQ, dev);
+	return 0;
+}
+
+static struct net_device_stats *get_stats(struct net_device *dev)
+{
+	return (struct net_device_stats *)(dev->priv);
+}
+
+static inline void trigger_interrupt(struct net_device *dev)
+{
+	de600_put_command(FLIP_IRQ);
+	select_prn();
+	DE600_SLOW_DOWN;
+	select_nic();
+	de600_put_command(0);
+}
+
+/*
+ * Copy a buffer to the adapter transmit page memory.
+ * Start sending.
+ */
+ 
+static int de600_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	unsigned long flags;
+	int	transmit_from;
+	int	len;
+	int	tickssofar;
+	u8	*buffer = skb->data;
+	int	i;
+
+	if (free_tx_pages <= 0) {	/* Do timeouts, to avoid hangs. */
+		tickssofar = jiffies - dev->trans_start;
+		if (tickssofar < 5)
+			return 1;
+		/* else */
+		printk(KERN_WARNING "%s: transmit timed out (%d), %s?\n", dev->name, tickssofar, "network cable problem");
+		/* Restart the adapter. */
+		spin_lock_irqsave(&de600_lock, flags);
+		if (adapter_init(dev)) {
+			spin_unlock_irqrestore(&de600_lock, flags);
+			return 1;
+		}
+		spin_unlock_irqrestore(&de600_lock, flags);
+	}
+
+	/* Start real output */
+	PRINTK(("de600_start_xmit:len=%d, page %d/%d\n", skb->len, tx_fifo_in, free_tx_pages));
+
+	if ((len = skb->len) < RUNT)
+		len = RUNT;
+
+	spin_lock_irqsave(&de600_lock, flags);
+	select_nic();
+	tx_fifo[tx_fifo_in] = transmit_from = tx_page_adr(tx_fifo_in) - len;
+	tx_fifo_in = (tx_fifo_in + 1) % TX_PAGES; /* Next free tx page */
+
+	if(check_lost)
+	{
+		/* This costs about 40 instructions per packet... */
+		de600_setup_address(NODE_ADDRESS, RW_ADDR);
+		de600_read_byte(READ_DATA, dev);
+		if (was_down || (de600_read_byte(READ_DATA, dev) != 0xde)) {
+			if (adapter_init(dev)) {
+				spin_unlock_irqrestore(&de600_lock, flags);
+				return 1;
+			}
+		}
+	}
+
+	de600_setup_address(transmit_from, RW_ADDR);
+	for (i = 0;  i < skb->len ; ++i, ++buffer)
+		de600_put_byte(*buffer);
+	for (; i < len; ++i)
+		de600_put_byte(0);
+
+	if (free_tx_pages-- == TX_PAGES) { /* No transmission going on */
+		dev->trans_start = jiffies;
+		netif_start_queue(dev); /* allow more packets into adapter */
+		/* Send page and generate a faked interrupt */
+		de600_setup_address(transmit_from, TX_ADDR);
+		de600_put_command(TX_ENABLE);
+	}
+	else {
+		if (free_tx_pages)
+			netif_start_queue(dev);
+		else
+			netif_stop_queue(dev);
+		select_prn();
+	}
+	spin_unlock_irqrestore(&de600_lock, flags);
+	dev_kfree_skb(skb);
+	return 0;
+}
+
+/*
+ * The typical workload of the driver:
+ * Handle the network interface interrupts.
+ */
+
+static irqreturn_t de600_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+	struct net_device	*dev = dev_id;
+	u8		irq_status;
+	int		retrig = 0;
+	int		boguscount = 0;
+
+	/* This might just as well be deleted now, no crummy drivers present :-) */
+	if ((dev == NULL) || (DE600_IRQ != irq)) {
+		printk(KERN_ERR "%s: bogus interrupt %d\n", dev?dev->name:"DE-600", irq);
+		return IRQ_NONE;
+	}
+
+	spin_lock(&de600_lock);
+	
+	select_nic();
+	irq_status = de600_read_status(dev);
+
+	do {
+		PRINTK(("de600_interrupt (%02X)\n", irq_status));
+
+		if (irq_status & RX_GOOD)
+			de600_rx_intr(dev);
+		else if (!(irq_status & RX_BUSY))
+			de600_put_command(RX_ENABLE);
+
+		/* Any transmission in progress? */
+		if (free_tx_pages < TX_PAGES)
+			retrig = de600_tx_intr(dev, irq_status);
+		else
+			retrig = 0;
+
+		irq_status = de600_read_status(dev);
+	} while ( (irq_status & RX_GOOD) || ((++boguscount < 100) && retrig) );
+	/*
+	 * Yeah, it _looks_ like busy waiting, smells like busy waiting
+	 * and I know it's not PC, but please, it will only occur once
+	 * in a while and then only for a loop or so (< 1ms for sure!)
+	 */
+
+	/* Enable adapter interrupts */
+	select_prn();
+	if (retrig)
+		trigger_interrupt(dev);
+	spin_unlock(&de600_lock);
+	return IRQ_HANDLED;
+}
+
+static int de600_tx_intr(struct net_device *dev, int irq_status)
+{
+	/*
+	 * Returns 1 if tx still not done
+	 */
+
+	/* Check if current transmission is done yet */
+	if (irq_status & TX_BUSY)
+		return 1; /* tx not done, try again */
+
+	/* else */
+	/* If last transmission OK then bump fifo index */
+	if (!(irq_status & TX_FAILED16)) {
+		tx_fifo_out = (tx_fifo_out + 1) % TX_PAGES;
+		++free_tx_pages;
+		((struct net_device_stats *)(dev->priv))->tx_packets++;
+		netif_wake_queue(dev);
+	}
+
+	/* More to send, or resend last packet? */
+	if ((free_tx_pages < TX_PAGES) || (irq_status & TX_FAILED16)) {
+		dev->trans_start = jiffies;
+		de600_setup_address(tx_fifo[tx_fifo_out], TX_ADDR);
+		de600_put_command(TX_ENABLE);
+		return 1;
+	}
+	/* else */
+
+	return 0;
+}
+
+/*
+ * We have a good packet, get it out of the adapter.
+ */
+static void de600_rx_intr(struct net_device *dev)
+{
+	struct sk_buff	*skb;
+	int		i;
+	int		read_from;
+	int		size;
+	unsigned char	*buffer;
+
+	/* Get size of received packet */
+	size = de600_read_byte(RX_LEN, dev);	/* low byte */
+	size += (de600_read_byte(RX_LEN, dev) << 8);	/* high byte */
+	size -= 4;	/* Ignore trailing 4 CRC-bytes */
+
+	/* Tell adapter where to store next incoming packet, enable receiver */
+	read_from = rx_page_adr();
+	next_rx_page();
+	de600_put_command(RX_ENABLE);
+
+	if ((size < 32)  ||  (size > 1535)) {
+		printk(KERN_WARNING "%s: Bogus packet size %d.\n", dev->name, size);
+		if (size > 10000)
+			adapter_init(dev);
+		return;
+	}
+
+	skb = dev_alloc_skb(size+2);
+	if (skb == NULL) {
+		printk("%s: Couldn't allocate a sk_buff of size %d.\n", dev->name, size);
+		return;
+	}
+	/* else */
+
+	skb->dev = dev;
+	skb_reserve(skb,2);	/* Align */
+
+	/* 'skb->data' points to the start of sk_buff data area. */
+	buffer = skb_put(skb,size);
+
+	/* copy the packet into the buffer */
+	de600_setup_address(read_from, RW_ADDR);
+	for (i = size; i > 0; --i, ++buffer)
+		*buffer = de600_read_byte(READ_DATA, dev);
+
+	skb->protocol=eth_type_trans(skb,dev);
+
+	netif_rx(skb);
+
+	/* update stats */
+	dev->last_rx = jiffies;
+	((struct net_device_stats *)(dev->priv))->rx_packets++; /* count all receives */
+	((struct net_device_stats *)(dev->priv))->rx_bytes += size; /* count all received bytes */
+
+	/*
+	 * If any worth-while packets have been received, netif_rx()
+	 * will work on them when we get to the tasklets.
+	 */
+}
+
+static struct net_device * __init de600_probe(void)
+{
+	int	i;
+	struct net_device *dev;
+	int err;
+
+	dev = alloc_etherdev(sizeof(struct net_device_stats));
+	if (!dev)
+		return ERR_PTR(-ENOMEM);
+
+	SET_MODULE_OWNER(dev);
+
+	if (!request_region(DE600_IO, 3, "de600")) {
+		printk(KERN_WARNING "DE600: port 0x%x busy\n", DE600_IO);
+		err = -EBUSY;
+		goto out;
+	}
+
+	printk(KERN_INFO "%s: D-Link DE-600 pocket adapter", dev->name);
+	/* Alpha testers must have the version number to report bugs. */
+	if (de600_debug > 1)
+		printk(version);
+
+	/* probe for adapter */
+	err = -ENODEV;
+	rx_page = 0;
+	select_nic();
+	(void)de600_read_status(dev);
+	de600_put_command(RESET);
+	de600_put_command(STOP_RESET);
+	if (de600_read_status(dev) & 0xf0) {
+		printk(": not at I/O %#3x.\n", DATA_PORT);
+		goto out1;
+	}
+
+	/*
+	 * Maybe we found one,
+	 * have to check if it is a D-Link DE-600 adapter...
+	 */
+
+	/* Get the adapter ethernet address from the ROM */
+	de600_setup_address(NODE_ADDRESS, RW_ADDR);
+	for (i = 0; i < ETH_ALEN; i++) {
+		dev->dev_addr[i] = de600_read_byte(READ_DATA, dev);
+		dev->broadcast[i] = 0xff;
+	}
+
+	/* Check magic code */
+	if ((dev->dev_addr[1] == 0xde) && (dev->dev_addr[2] == 0x15)) {
+		/* OK, install real address */
+		dev->dev_addr[0] = 0x00;
+		dev->dev_addr[1] = 0x80;
+		dev->dev_addr[2] = 0xc8;
+		dev->dev_addr[3] &= 0x0f;
+		dev->dev_addr[3] |= 0x70;
+	} else {
+		printk(" not identified in the printer port\n");
+		goto out1;
+	}
+
+	printk(", Ethernet Address: %02X", dev->dev_addr[0]);
+	for (i = 1; i < ETH_ALEN; i++)
+		printk(":%02X",dev->dev_addr[i]);
+	printk("\n");
+
+	dev->get_stats = get_stats;
+
+	dev->open = de600_open;
+	dev->stop = de600_close;
+	dev->hard_start_xmit = &de600_start_xmit;
+
+	dev->flags&=~IFF_MULTICAST;
+
+	select_prn();
+
+	err = register_netdev(dev);
+	if (err)
+		goto out1;
+
+	return dev;
+
+out1:
+	release_region(DE600_IO, 3);
+out:
+	free_netdev(dev);
+	return ERR_PTR(err);
+}
+
+static int adapter_init(struct net_device *dev)
+{
+	int	i;
+
+	select_nic();
+	rx_page = 0; /* used by RESET */
+	de600_put_command(RESET);
+	de600_put_command(STOP_RESET);
+
+	/* Check if it is still there... */
+	/* Get the some bytes of the adapter ethernet address from the ROM */
+	de600_setup_address(NODE_ADDRESS, RW_ADDR);
+	de600_read_byte(READ_DATA, dev);
+	if ((de600_read_byte(READ_DATA, dev) != 0xde) ||
+	    (de600_read_byte(READ_DATA, dev) != 0x15)) {
+	/* was: if (de600_read_status(dev) & 0xf0) { */
+		printk("Something has happened to the DE-600!  Please check it and do a new ifconfig!\n");
+		/* Goodbye, cruel world... */
+		dev->flags &= ~IFF_UP;
+		de600_close(dev);
+		was_down = 1;
+		netif_stop_queue(dev); /* Transmit busy...  */
+		return 1; /* failed */
+	}
+
+	if (was_down) {
+		printk(KERN_INFO "%s: Thanks, I feel much better now!\n", dev->name);
+		was_down = 0;
+	}
+
+	tx_fifo_in = 0;
+	tx_fifo_out = 0;
+	free_tx_pages = TX_PAGES;
+
+
+	/* set the ether address. */
+	de600_setup_address(NODE_ADDRESS, RW_ADDR);
+	for (i = 0; i < ETH_ALEN; i++)
+		de600_put_byte(dev->dev_addr[i]);
+
+	/* where to start saving incoming packets */
+	rx_page = RX_BP | RX_BASE_PAGE;
+	de600_setup_address(MEM_4K, RW_ADDR);
+	/* Enable receiver */
+	de600_put_command(RX_ENABLE);
+	select_prn();
+
+	netif_start_queue(dev);
+
+	return 0; /* OK */
+}
+
+static struct net_device *de600_dev;
+
+static int __init de600_init(void)
+{
+	de600_dev = de600_probe();
+	if (IS_ERR(de600_dev))
+		return PTR_ERR(de600_dev);
+	return 0;
+}
+
+static void __exit de600_exit(void)
+{
+	unregister_netdev(de600_dev);
+	release_region(DE600_IO, 3);
+	free_netdev(de600_dev);
+}
+
+module_init(de600_init);
+module_exit(de600_exit);
+
+MODULE_LICENSE("GPL");