api_net.c

uboot详细解读可用启动引导LINUX2.6内核

/*
 * (C) Copyright 2007 Semihalf
 *
 * Written by: Rafal Jaworowski <[e-mail]>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 of
 * the License, 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., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */

#include <config.h>

#if defined(CONFIG_API)

#include <common.h>
#include <net.h>
#include <linux/types.h>
#include <api_public.h>

DECLARE_GLOBAL_DATA_PTR;

#define DEBUG
#undef DEBUG

#if !defined(CONFIG_NET_MULTI)
#error "API/net is currently only available for platforms with CONFIG_NET_MULTI"
#endif

#ifdef DEBUG
#define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt, ##args); } while (0)
#else
#define debugf(fmt, args...)
#endif

#define errf(fmt, args...) do { printf("ERROR @ %s(): ", __func__); printf(fmt, ##args); } while (0)


static int dev_valid_net(void *cookie)
{
	return ((void *)eth_get_dev() == cookie) ? 1 : 0;
}

int dev_open_net(void *cookie)
{
	if (!dev_valid_net(cookie))
		return API_ENODEV;

	if (eth_init(gd->bd) < 0)
		return API_EIO;

	return 0;
}

int dev_close_net(void *cookie)
{
	if (!dev_valid_net(cookie))
		return API_ENODEV;

	eth_halt();
	return 0;
}

/*
 * There can only be one active eth interface at a time - use what is
 * currently set to eth_current
 */
int dev_enum_net(struct device_info *di)
{
	struct eth_device *eth_current = eth_get_dev();

	di->type = DEV_TYP_NET;
	di->cookie = (void *)eth_current;
	if (di->cookie == NULL)
		return 0;

	memcpy(di->di_net.hwaddr, eth_current->enetaddr, 6);

	debugf("device found, returning cookie 0x%08x\n",
		(u_int32_t)di->cookie);

	return 1;
}

int dev_write_net(void *cookie, void *buf, int len)
{
	/* XXX verify that cookie points to a valid net device??? */

	return eth_send(buf, len);
}

int dev_read_net(void *cookie, void *buf, int len)
{
	/* XXX verify that cookie points to a valid net device??? */

	return eth_receive(buf, len);
}

#endif /* CONFIG_API */