1 files changed, 138 insertions, 0 deletions
diff --git a/drivers/clk/at91/clk-utmi.c b/drivers/clk/at91/clk-utmi.c
new file mode 100644
index 0000000000..6a1c5e6df3
--- /dev/null
+++ b/drivers/clk/at91/clk-utmi.c
@@ -0,0 +1,138 @@
+/*
+ *  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 <common.h>
+#include <clock.h>
+#include <of.h>
+#include <linux/list.h>
+#include <linux/clk.h>
+#include <linux/clk/at91_pmc.h>
+#include <mfd/syscon.h>
+#include <regmap.h>
+
+#include "pmc.h"
+
+#define UTMI_FIXED_MUL		40
+
+struct clk_utmi {
+	struct clk clk;
+	struct regmap *regmap;
+	const char *parent;
+};
+
+#define to_clk_utmi(clk) container_of(clk, struct clk_utmi, clk)
+
+static inline bool clk_utmi_ready(struct regmap *regmap)
+{
+	unsigned int status;
+
+	regmap_read(regmap, AT91_PMC_SR, &status);
+
+	return status & AT91_PMC_LOCKU;
+}
+
+static int clk_utmi_enable(struct clk *clk)
+{
+	struct clk_utmi *utmi = to_clk_utmi(clk);
+	unsigned int uckr = AT91_PMC_UPLLEN | AT91_PMC_UPLLCOUNT |
+			    AT91_PMC_BIASEN;
+
+	regmap_write_bits(utmi->regmap, AT91_CKGR_UCKR, uckr, uckr);
+
+	while (!clk_utmi_ready(utmi->regmap))
+		barrier();
+
+	return 0;
+}
+
+static int clk_utmi_is_enabled(struct clk *clk)
+{
+	struct clk_utmi *utmi = to_clk_utmi(clk);
+
+	return clk_utmi_ready(utmi->regmap);
+}
+
+static void clk_utmi_disable(struct clk *clk)
+{
+	struct clk_utmi *utmi = to_clk_utmi(clk);
+
+	regmap_write_bits(utmi->regmap, AT91_CKGR_UCKR, AT91_PMC_UPLLEN, 0);
+}
+
+static unsigned long clk_utmi_recalc_rate(struct clk *clk,
+					  unsigned long parent_rate)
+{
+	/* UTMI clk is a fixed clk multiplier */
+	return parent_rate * UTMI_FIXED_MUL;
+}
+
+static const struct clk_ops utmi_ops = {
+	.enable = clk_utmi_enable,
+	.disable = clk_utmi_disable,
+	.is_enabled = clk_utmi_is_enabled,
+	.recalc_rate = clk_utmi_recalc_rate,
+};
+
+static struct clk * __init
+at91_clk_register_utmi(struct regmap *regmap,
+		       const char *name, const char *parent_name)
+{
+	int ret;
+	struct clk_utmi *utmi;
+
+	utmi = xzalloc(sizeof(*utmi));
+
+	utmi->clk.name = name;
+	utmi->clk.ops = &utmi_ops;
+
+	if (parent_name) {
+		utmi->parent = parent_name;
+		utmi->clk.parent_names = &utmi->parent;
+		utmi->clk.num_parents = 1;
+	}
+
+	/* utmi->clk.flags = CLK_SET_RATE_GATE; */
+
+	utmi->regmap = regmap;
+
+	ret = clk_register(&utmi->clk);
+	if (ret) {
+		kfree(utmi);
+		return ERR_PTR(ret);
+	}
+
+	return &utmi->clk;
+}
+#if defined(CONFIG_OFTREE) && defined(CONFIG_COMMON_CLK_OF_PROVIDER)
+static void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np)
+{
+	struct clk *clk;
+	const char *parent_name;
+	const char *name = np->name;
+	struct regmap *regmap;
+
+	parent_name = of_clk_get_parent_name(np, 0);
+
+	of_property_read_string(np, "clock-output-names", &name);
+
+	regmap = syscon_node_to_regmap(of_get_parent(np));
+	if (IS_ERR(regmap))
+		return;
+
+	clk = at91_clk_register_utmi(regmap, name, parent_name);
+	if (IS_ERR(clk))
+		return;
+
+	of_clk_add_provider(np, of_clk_src_simple_get, clk);
+	return;
+}
+CLK_OF_DECLARE(at91sam9x5_clk_utmi, "atmel,at91sam9x5-clk-utmi",
+	       of_at91sam9x5_clk_utmi_setup);
+#endif