1 files changed, 162 insertions, 0 deletions
diff --git a/drivers/clk/at91/clk-system.c b/drivers/clk/at91/clk-system.c
new file mode 100644
index 000000000..86a368097
--- /dev/null
+++ b/drivers/clk/at91/clk-system.c
@@ -0,0 +1,162 @@
+/*
+ *  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"
+
+#define SYSTEM_MAX_ID		31
+
+#define SYSTEM_MAX_NAME_SZ	32
+
+#define to_clk_system(hw) container_of(hw, struct clk_system, hw)
+struct clk_system {
+	struct clk_hw hw;
+	struct regmap *regmap;
+	u8 id;
+};
+
+static inline int is_pck(int id)
+{
+	return (id >= 8) && (id <= 15);
+}
+
+static inline bool clk_system_ready(struct regmap *regmap, int id)
+{
+	unsigned int status;
+
+	regmap_read(regmap, AT91_PMC_SR, &status);
+
+	return status & (1 << id) ? 1 : 0;
+}
+
+static int clk_system_prepare(struct clk_hw *hw)
+{
+	struct clk_system *sys = to_clk_system(hw);
+
+	regmap_write(sys->regmap, AT91_PMC_SCER, 1 << sys->id);
+
+	if (!is_pck(sys->id))
+		return 0;
+
+	while (!clk_system_ready(sys->regmap, sys->id))
+		cpu_relax();
+
+	return 0;
+}
+
+static void clk_system_unprepare(struct clk_hw *hw)
+{
+	struct clk_system *sys = to_clk_system(hw);
+
+	regmap_write(sys->regmap, AT91_PMC_SCDR, 1 << sys->id);
+}
+
+static int clk_system_is_prepared(struct clk_hw *hw)
+{
+	struct clk_system *sys = to_clk_system(hw);
+	unsigned int status;
+
+	regmap_read(sys->regmap, AT91_PMC_SCSR, &status);
+
+	if (!(status & (1 << sys->id)))
+		return 0;
+
+	if (!is_pck(sys->id))
+		return 1;
+
+	regmap_read(sys->regmap, AT91_PMC_SR, &status);
+
+	return status & (1 << sys->id) ? 1 : 0;
+}
+
+static const struct clk_ops system_ops = {
+	.prepare = clk_system_prepare,
+	.unprepare = clk_system_unprepare,
+	.is_prepared = clk_system_is_prepared,
+};
+
+static struct clk_hw * __init
+at91_clk_register_system(struct regmap *regmap, const char *name,
+			 const char *parent_name, u8 id)
+{
+	struct clk_system *sys;
+	struct clk_hw *hw;
+	struct clk_init_data init;
+	int ret;
+
+	if (!parent_name || id > SYSTEM_MAX_ID)
+		return ERR_PTR(-EINVAL);
+
+	sys = kzalloc(sizeof(*sys), GFP_KERNEL);
+	if (!sys)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &system_ops;
+	init.parent_names = &parent_name;
+	init.num_parents = 1;
+	init.flags = CLK_SET_RATE_PARENT;
+
+	sys->id = id;
+	sys->hw.init = &init;
+	sys->regmap = regmap;
+
+	hw = &sys->hw;
+	ret = clk_hw_register(NULL, &sys->hw);
+	if (ret) {
+		kfree(sys);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}
+
+static void __init of_at91rm9200_clk_sys_setup(struct device_node *np)
+{
+	int num;
+	u32 id;
+	struct clk_hw *hw;
+	const char *name;
+	struct device_node *sysclknp;
+	const char *parent_name;
+	struct regmap *regmap;
+
+	num = of_get_child_count(np);
+	if (num > (SYSTEM_MAX_ID + 1))
+		return;
+
+	regmap = syscon_node_to_regmap(of_get_parent(np));
+	if (IS_ERR(regmap))
+		return;
+
+	for_each_child_of_node(np, sysclknp) {
+		if (of_property_read_u32(sysclknp, "reg", &id))
+			continue;
+
+		if (of_property_read_string(np, "clock-output-names", &name))
+			name = sysclknp->name;
+
+		parent_name = of_clk_get_parent_name(sysclknp, 0);
+
+		hw = at91_clk_register_system(regmap, name, parent_name, id);
+		if (IS_ERR(hw))
+			continue;
+
+		of_clk_add_hw_provider(sysclknp, of_clk_hw_simple_get, hw);
+	}
+}
+CLK_OF_DECLARE(at91rm9200_clk_sys, "atmel,at91rm9200-clk-system",
+	       of_at91rm9200_clk_sys_setup);