/*
 * Copyright (C) 2007-2013 American Megatrends Inc
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifdef __UBOOT__	
#include <common.h>
#endif
#include "spiflash.h"
#ifdef	CONFIG_FLASH_SPI_DRIVER

DEFINE_SPINLOCK(spi_chip_drvs_lock);
DEFINE_SPINLOCK(spi_ctrl_drvs_lock);

#ifdef __UBOOT__  /*MIPS*/
struct list_head spi_chip_drvs_list = { 0, 0};
struct list_head spi_ctrl_drvs_list = { 0, 0};
#else
LIST_HEAD(spi_chip_drvs_list);
LIST_HEAD(spi_ctrl_drvs_list);
#endif

void 
register_spi_chip_driver(struct spi_chip_driver *drv)
{
#ifdef __UBOOT__  /*MIPS*/
	if ((spi_chip_drvs_list.prev == 0) && (spi_chip_drvs_list.next == 0))
		INIT_LIST_HEAD(&spi_chip_drvs_list);
#endif
	spin_lock(&spi_chip_drvs_lock);
	list_add(&drv->list, &spi_chip_drvs_list);
	spin_unlock(&spi_chip_drvs_lock);
}

void 
unregister_spi_chip_driver(struct spi_chip_driver *drv)
{
	spin_lock(&spi_chip_drvs_lock);
	list_del(&drv->list);
	spin_unlock(&spi_chip_drvs_lock);
}

void 
register_spi_ctrl_driver(struct spi_ctrl_driver *drv)
{
#ifdef __UBOOT__  /*MIPS*/
	if ((spi_ctrl_drvs_list.prev == 0) && (spi_ctrl_drvs_list.next == 0))
		INIT_LIST_HEAD(&spi_ctrl_drvs_list);
#endif
	spin_lock(&spi_ctrl_drvs_lock);
	list_add(&drv->list, &spi_ctrl_drvs_list);
	spin_unlock(&spi_ctrl_drvs_lock);
}

void 
unregister_spi_ctrl_driver(struct spi_ctrl_driver *drv)
{
	spin_lock(&spi_ctrl_drvs_lock);
	list_del(&drv->list);
	spin_unlock(&spi_ctrl_drvs_lock);
}

struct spi_chip_driver *
get_spi_chip_driver_by_name (const char *name)
{
	struct list_head *pos;
	struct spi_chip_driver *ret = NULL, *this;

	spin_lock(&spi_chip_drvs_lock);

	list_for_each(pos, &spi_chip_drvs_list) {
		this = list_entry(pos, typeof(*this), list);

		if (!strcmp(this->name, name)) {
			ret = this;
			break;
		}
	}
	if (ret && !try_module_get(ret->module))
		ret = NULL;

	spin_unlock(&spi_chip_drvs_lock);

	return ret;
}

struct spi_chip_driver *
get_spi_chip_driver_by_index (int index)
{
	struct list_head *pos;
	struct spi_chip_driver *ret = NULL, *this;
	int got;

	spin_lock(&spi_chip_drvs_lock);
	
	got=0;
	list_for_each(pos, &spi_chip_drvs_list) {
		this = list_entry(pos, typeof(*this), list);

		if (index == got) {
			ret = this;
			break;
		}
		got++;
	}
	if (ret && !try_module_get(ret->module))
		ret = NULL;

	spin_unlock(&spi_chip_drvs_lock);

	return ret;
}


struct spi_ctrl_driver *
get_spi_ctrl_driver_by_name (const char *name)
{
	struct list_head *pos;
	struct spi_ctrl_driver *ret = NULL, *this;

	spin_lock(&spi_ctrl_drvs_lock);

	list_for_each(pos, &spi_ctrl_drvs_list) {
		this = list_entry(pos, typeof(*this), list);

		if (!strcmp(this->name, name)) {
			ret = this;
			break;
		}
	}
	if (ret && !try_module_get(ret->module))
		ret = NULL;

	spin_unlock(&spi_ctrl_drvs_lock);

	return ret;
}

struct spi_ctrl_driver *
get_spi_ctrl_driver_by_index (int index)
{
	struct list_head *pos;
	struct spi_ctrl_driver *ret = NULL, *this;
	int got;

	spin_lock(&spi_ctrl_drvs_lock);

	got=0;
	list_for_each(pos, &spi_ctrl_drvs_list) {
		this = list_entry(pos, typeof(*this), list);

		if (index == got) {
			ret = this;
			break;
		}
		got++;
	}
	if (ret && !try_module_get(ret->module))
		ret = NULL;

	spin_unlock(&spi_ctrl_drvs_lock);

	return ret;
}



EXPORT_SYMBOL(get_spi_chip_driver_by_name);
EXPORT_SYMBOL(get_spi_chip_driver_by_index);
EXPORT_SYMBOL(get_spi_ctrl_driver_by_name);
EXPORT_SYMBOL(get_spi_ctrl_driver_by_index);
EXPORT_SYMBOL(register_spi_ctrl_driver);
EXPORT_SYMBOL(unregister_spi_ctrl_driver);
EXPORT_SYMBOL(register_spi_chip_driver);
EXPORT_SYMBOL(unregister_spi_chip_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("American Megatrends Inc");
MODULE_DESCRIPTION("Core routines for (un)registering  spi chip and controller drivers");

#endif