1 files changed, 105 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/clock-domain.c b/arch/arm/mach-exynos/clock-domain.c
new file mode 100644
index 0000000..187dfa1
--- /dev/null
+++ b/arch/arm/mach-exynos/clock-domain.c
@@ -0,0 +1,105 @@
+/* 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;
+}