1 files changed, 111 insertions, 0 deletions
diff --git a/drivers/clk/at91/clk-slow.c b/drivers/clk/at91/clk-slow.c
new file mode 100644
index 000000000..560a8b9ab
--- /dev/null
+++ b/drivers/clk/at91/clk-slow.c
@@ -0,0 +1,111 @@
+/*
+ * drivers/clk/at91/clk-slow.c
+ *
+ *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
+ *
+ * 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.
+ *
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/clk/at91_pmc.h>
+#include <linux/of.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#include "pmc.h"
+
+struct clk_sam9260_slow {
+	struct clk_hw hw;
+	struct regmap *regmap;
+};
+
+#define to_clk_sam9260_slow(hw) container_of(hw, struct clk_sam9260_slow, hw)
+
+static u8 clk_sam9260_slow_get_parent(struct clk_hw *hw)
+{
+	struct clk_sam9260_slow *slowck = to_clk_sam9260_slow(hw);
+	unsigned int status;
+
+	regmap_read(slowck->regmap, AT91_PMC_SR, &status);
+
+	return status & AT91_PMC_OSCSEL ? 1 : 0;
+}
+
+static const struct clk_ops sam9260_slow_ops = {
+	.get_parent = clk_sam9260_slow_get_parent,
+};
+
+static struct clk_hw * __init
+at91_clk_register_sam9260_slow(struct regmap *regmap,
+			       const char *name,
+			       const char **parent_names,
+			       int num_parents)
+{
+	struct clk_sam9260_slow *slowck;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	if (!name)
+		return ERR_PTR(-EINVAL);
+
+	if (!parent_names || !num_parents)
+		return ERR_PTR(-EINVAL);
+
+	slowck = kzalloc(sizeof(*slowck), GFP_KERNEL);
+	if (!slowck)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &sam9260_slow_ops;
+	init.parent_names = parent_names;
+	init.num_parents = num_parents;
+	init.flags = 0;
+
+	slowck->hw.init = &init;
+	slowck->regmap = regmap;
+
+	hw = &slowck->hw;
+	ret = clk_hw_register(NULL, &slowck->hw);
+	if (ret) {
+		kfree(slowck);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}
+
+static void __init of_at91sam9260_clk_slow_setup(struct device_node *np)
+{
+	struct clk_hw *hw;
+	const char *parent_names[2];
+	unsigned int num_parents;
+	const char *name = np->name;
+	struct regmap *regmap;
+
+	num_parents = of_clk_get_parent_count(np);
+	if (num_parents != 2)
+		return;
+
+	of_clk_parent_fill(np, parent_names, num_parents);
+	regmap = syscon_node_to_regmap(of_get_parent(np));
+	if (IS_ERR(regmap))
+		return;
+
+	of_property_read_string(np, "clock-output-names", &name);
+
+	hw = at91_clk_register_sam9260_slow(regmap, name, parent_names,
+					     num_parents);
+	if (IS_ERR(hw))
+		return;
+
+	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
+}
+
+CLK_OF_DECLARE(at91sam9260_clk_slow, "atmel,at91sam9260-clk-slow",
+	       of_at91sam9260_clk_slow_setup);