path: root/drivers/net/net_init.c

/* netdrv_init.c: Initialization for network devices. */
/*
	Written 1993,1994,1995 by Donald Becker.

	The author may be reached as becker@cesdis.gsfc.nasa.gov or
	C/O Center of Excellence in Space Data and Information Sciences
		Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771

	This file contains the initialization for the "pl14+" style ethernet
	drivers.  It should eventually replace most of drivers/net/Space.c.
	It's primary advantage is that it's able to allocate low-memory buffers.
	A secondary advantage is that the dangerous NE*000 netcards can reserve
	their I/O port region before the SCSI probes start.

	Modifications/additions by Bjorn Ekwall <bj0rn@blox.se>:
		ethdev_index[MAX_ETH_CARDS]
		register_netdev() / unregister_netdev()
*/

#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/malloc.h>
#include <linux/if_ether.h>
#include <linux/string.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/trdevice.h>

/* The network devices currently exist only in the socket namespace, so these
   entries are unused.  The only ones that make sense are
    open	start the ethercard
    close	stop  the ethercard
    ioctl	To get statistics, perhaps set the interface port (AUI, BNC, etc.)
   One can also imagine getting raw packets using
    read & write
   but this is probably better handled by a raw packet socket.

   Given that almost all of these functions are handled in the current
   socket-based scheme, putting ethercard devices in /dev/ seems pointless.
   
   [Removed all support for /dev network devices. When someone adds
    streams then by magic we get them, but otherwise they are un-needed
	and a space waste]
*/

/* The list of used and available "eth" slots (for "eth0", "eth1", etc.) */
#define MAX_ETH_CARDS 16 /* same as the number if irq's in irq2dev[] */
static struct device *ethdev_index[MAX_ETH_CARDS];

unsigned long lance_init(unsigned long mem_start, unsigned long mem_end);
unsigned long pi_init(unsigned long mem_start, unsigned long mem_end);
unsigned long apricot_init(unsigned long mem_start, unsigned long mem_end);
unsigned long dec21040_init(unsigned long mem_start, unsigned long mem_end);

/*
  net_dev_init() is our network device initialization routine.
  It's called from init/main.c with the start and end of free memory,
  and returns the new start of free memory.
  */

unsigned long net_dev_init (unsigned long mem_start, unsigned long mem_end)
{

	/* Network device initialization for devices that must allocate
	   low-memory or contiguous DMA buffers.
	   */
#if defined(CONFIG_LANCE)
	mem_start = lance_init(mem_start, mem_end);
#endif
#if defined(CONFIG_PI)
	mem_start = pi_init(mem_start, mem_end);
#endif	
#if defined(CONFIG_DEC_ELCP)
	mem_start = dec21040_init(mem_start, mem_end);
#endif	
	return mem_start;
}

/* Fill in the fields of the device structure with ethernet-generic values.

   If no device structure is passed, a new one is constructed, complete with
   a SIZEOF_PRIVATE private data area.

   If an empty string area is passed as dev->name, or a new structure is made,
   a new name string is constructed.  The passed string area should be 8 bytes
   long.
 */

struct device *
init_etherdev(struct device *dev, int sizeof_priv, unsigned long *mem_startp)
{
	int new_device = 0;
	int i;

	/* Use an existing correctly named device in Space.c:dev_base. */
	if (dev == NULL) {
		int alloc_size = sizeof(struct device) + sizeof("eth%d  ")
			+ sizeof_priv + 3;
		struct device *cur_dev;
		char pname[8];		/* Putative name for the device.  */

		for (i = 0; i < MAX_ETH_CARDS; ++i)
			if (ethdev_index[i] == NULL) {
				sprintf(pname, "eth%d", i);
				for (cur_dev = dev_base; cur_dev; cur_dev = cur_dev->next)
					if (strcmp(pname, cur_dev->name) == 0) {
						dev = cur_dev;
						dev->init = NULL;
						sizeof_priv = (sizeof_priv + 3) & ~3;
						if (mem_startp && *mem_startp ) {
							dev->priv = (void*) *mem_startp;
							*mem_startp += sizeof_priv;
						} else
							dev->priv = kmalloc(sizeof_priv, GFP_KERNEL);
						memset(dev->priv, 0, sizeof_priv);
						goto found;
					}
			}

		alloc_size &= ~3;		/* Round to dword boundary. */

		if (mem_startp && *mem_startp ) {
			dev = (struct device *)*mem_startp;
			*mem_startp += alloc_size;
		} else
			dev = (struct device *)kmalloc(alloc_size, GFP_KERNEL);
		memset(dev, 0, alloc_size);
		if (sizeof_priv)
			dev->priv = (void *) (dev + 1);
		dev->name = sizeof_priv + (char *)(dev + 1);
		new_device = 1;
	}

	found:						/* From the double loop above. */

	if (dev->name &&
		((dev->name[0] == '\0') || (dev->name[0] == ' '))) {
		for (i = 0; i < MAX_ETH_CARDS; ++i)
			if (ethdev_index[i] == NULL) {
				sprintf(dev->name, "eth%d", i);
				ethdev_index[i] = dev;
				break;
			}
	}

	ether_setup(dev); 	/* Hmmm, should this be called here? */
	
	if (new_device) {
		/* Append the device to the device queue. */
		struct device **old_devp = &dev_base;
		while ((*old_devp)->next)
			old_devp = & (*old_devp)->next;
		(*old_devp)->next = dev;
		dev->next = 0;
	}
	return dev;
}

void ether_setup(struct device *dev)
{
	int i;
	/* Fill in the fields of the device structure with ethernet-generic values.
	   This should be in a common file instead of per-driver.  */
	for (i = 0; i < DEV_NUMBUFFS; i++)
		skb_queue_head_init(&dev->buffs[i]);

	/* register boot-defined "eth" devices */
	if (dev->name && (strncmp(dev->name, "eth", 3) == 0)) {
		i = simple_strtoul(dev->name + 3, NULL, 0);
		if (ethdev_index[i] == NULL) {
			ethdev_index[i] = dev;
		}
		else if (dev != ethdev_index[i]) {
			/* Really shouldn't happen! */
			printk("ether_setup: Ouch! Someone else took %s\n",
				dev->name);
		}
	}

	dev->hard_header	= eth_header;
	dev->rebuild_header = eth_rebuild_header;

	dev->type		= ARPHRD_ETHER;
	dev->hard_header_len = ETH_HLEN;
	dev->mtu		= 1500; /* eth_mtu */
	dev->addr_len	= ETH_ALEN;
	for (i = 0; i < ETH_ALEN; i++) {
		dev->broadcast[i]=0xff;
	}

	/* New-style flags. */
	dev->flags		= IFF_BROADCAST|IFF_MULTICAST;
	dev->family		= AF_INET;
	dev->pa_addr	= 0;
	dev->pa_brdaddr = 0;
	dev->pa_mask	= 0;
	dev->pa_alen	= sizeof(unsigned long);
}

#ifdef CONFIG_TR

void tr_setup(struct device *dev)
{
	int i;
	/* Fill in the fields of the device structure with ethernet-generic values.
	   This should be in a common file instead of per-driver.  */
	for (i = 0; i < DEV_NUMBUFFS; i++)
		skb_queue_head_init(&dev->buffs[i]);

	dev->hard_header	= tr_header;
	dev->rebuild_header = tr_rebuild_header;

	dev->type		= ARPHRD_IEEE802;
	dev->hard_header_len = TR_HLEN;
	dev->mtu		= 2000; /* bug in fragmenter...*/
	dev->addr_len	= TR_ALEN;
	for (i = 0; i < TR_ALEN; i++) {
		dev->broadcast[i]=0xff;
	}

	/* New-style flags. */
	dev->flags		= IFF_BROADCAST;
	dev->family		= AF_INET;
	dev->pa_addr	= 0;
	dev->pa_brdaddr = 0;
	dev->pa_mask	= 0;
	dev->pa_alen	= sizeof(unsigned long);
}

#endif

int ether_config(struct device *dev, struct ifmap *map)
{
	if (map->mem_start != (u_long)(-1))
		dev->mem_start = map->mem_start;
	if (map->mem_end != (u_long)(-1))
		dev->mem_end = map->mem_end;
	if (map->base_addr != (u_short)(-1))
		dev->base_addr = map->base_addr;
	if (map->irq != (u_char)(-1))
		dev->irq = map->irq;
	if (map->dma != (u_char)(-1))
		dev->dma = map->dma;
	if (map->port != (u_char)(-1))
		dev->if_port = map->port;
	return 0;
}

int register_netdev(struct device *dev)
{
	struct device *d = dev_base;
	unsigned long flags;
	int i=MAX_ETH_CARDS;

	save_flags(flags);
	cli();

	if (dev && dev->init) {
		if (dev->name &&
			((dev->name[0] == '\0') || (dev->name[0] == ' '))) {
			for (i = 0; i < MAX_ETH_CARDS; ++i)
				if (ethdev_index[i] == NULL) {
					sprintf(dev->name, "eth%d", i);
					printk("loading device '%s'...\n", dev->name);
					ethdev_index[i] = dev;
					break;
				}
		}

		if (dev->init(dev) != 0) {
		    if (i < MAX_ETH_CARDS) ethdev_index[i] = NULL;
			restore_flags(flags);
			return -EIO;
		}

		/* Add device to end of chain */
		if (dev_base) {
			while (d->next)
				d = d->next;
			d->next = dev;
		}
		else
			dev_base = dev;
		dev->next = NULL;
	}
	restore_flags(flags);
	return 0;
}

void unregister_netdev(struct device *dev)
{
	struct device *d = dev_base;
	unsigned long flags;
	int i;

	save_flags(flags);
	cli();

	printk("unregister_netdev: device ");

	if (dev == NULL) {
		printk("was NULL\n");
		restore_flags(flags);
		return;
	}
	/* else */
	if (dev->start)
		printk("'%s' busy\n", dev->name);
	else {
		if (dev_base == dev)
			dev_base = dev->next;
		else {
			while (d && (d->next != dev))
				d = d->next;

			if (d && (d->next == dev)) {
				d->next = dev->next;
				printk("'%s' unlinked\n", dev->name);
			}
			else {
				printk("'%s' not found\n", dev->name);
				restore_flags(flags);
				return;
			}
		}
		for (i = 0; i < MAX_ETH_CARDS; ++i) {
			if (ethdev_index[i] == dev) {
				ethdev_index[i] = NULL;
				break;
			}
		}
	}
	restore_flags(flags);
}



/*
 * Local variables:
 *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c net_init.c"
 *  version-control: t
 *  kept-new-versions: 5
 *  tab-width: 4
 * End:
 */