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/* linux/arch/arm/mach-exynos/clock-domain.c
*
* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* EXYNOS - Clock Domain support
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/cpufreq.h>
#include <linux/list.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/device.h>
#include <plat/clock.h>
#include <mach/clock-domain.h>
static LIST_HEAD(clock_domain_list);
/* Lock to allow exclusive modification to the clock domain list */
static DEFINE_MUTEX(clock_domain_list_lock);
static struct clock_domain *find_clock_domain(unsigned int flag)
{
struct clock_domain *tmp_domain, *domain = ERR_PTR(-ENODEV);
list_for_each_entry_rcu(tmp_domain, &clock_domain_list, node) {
if (tmp_domain->flag & flag) {
domain = tmp_domain;
break;
}
}
return domain;
}
int clock_domain_enabled(unsigned int flag)
{
struct clock_domain *domain;
struct clock *clock;
domain = find_clock_domain(flag);
if (IS_ERR(domain)) {
pr_err("Unable to find Clock Domain\n");
return -EINVAL;
}
list_for_each_entry_rcu(clock, &domain->domain_list, node) {
if (clock->clk->usage)
return -EINVAL;
}
return 0;
}
int clock_add_domain(unsigned int flag, struct clk *clk)
{
struct clock_domain *domain = NULL;
struct clock *clock;
/* allocate new clock node */
clock = kzalloc(sizeof(struct clock), GFP_KERNEL);
if (!clock) {
pr_err("Unable to create new Clock node\n");
return -ENOMEM;
}
/* Hold our list modification lock here */
mutex_lock(&clock_domain_list_lock);
/* Check for existing list for 'dev' */
domain = find_clock_domain(flag);
if (IS_ERR(domain)) {
/*
* Allocate a new Clock Doamin.*/
domain = kzalloc(sizeof(struct clock_domain), GFP_KERNEL);
if (!domain) {
mutex_unlock(&clock_domain_list_lock);
kfree(clock);
pr_err("Unable to create Clock Domain structure\n");
return -ENOMEM;
}
domain->flag = flag;
INIT_LIST_HEAD(&domain->domain_list);
list_add_rcu(&domain->node, &clock_domain_list);
}
clock->clk = clk;
list_add_rcu(&clock->node, &domain->domain_list);
mutex_unlock(&clock_domain_list_lock);
return 0;
}
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