1 files changed, 135 insertions, 0 deletions
diff --git a/drivers/clk/at91/clk-plldiv.c b/drivers/clk/at91/clk-plldiv.c
new file mode 100644
index 000000000000..ea226562bb40
--- /dev/null
+++ b/drivers/clk/at91/clk-plldiv.c
@@ -0,0 +1,135 @@
+/*
+ *  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/of_address.h>
+#include <linux/io.h>
+
+#include "pmc.h"
+
+#define to_clk_plldiv(hw) container_of(hw, struct clk_plldiv, hw)
+
+struct clk_plldiv {
+	struct clk_hw hw;
+	struct at91_pmc *pmc;
+};
+
+static unsigned long clk_plldiv_recalc_rate(struct clk_hw *hw,
+					    unsigned long parent_rate)
+{
+	struct clk_plldiv *plldiv = to_clk_plldiv(hw);
+	struct at91_pmc *pmc = plldiv->pmc;
+
+	if (pmc_read(pmc, AT91_PMC_MCKR) & AT91_PMC_PLLADIV2)
+		return parent_rate / 2;
+
+	return parent_rate;
+}
+
+static long clk_plldiv_round_rate(struct clk_hw *hw, unsigned long rate,
+					unsigned long *parent_rate)
+{
+	unsigned long div;
+
+	if (rate > *parent_rate)
+		return *parent_rate;
+	div = *parent_rate / 2;
+	if (rate < div)
+		return div;
+
+	if (rate - div < *parent_rate - rate)
+		return div;
+
+	return *parent_rate;
+}
+
+static int clk_plldiv_set_rate(struct clk_hw *hw, unsigned long rate,
+			       unsigned long parent_rate)
+{
+	struct clk_plldiv *plldiv = to_clk_plldiv(hw);
+	struct at91_pmc *pmc = plldiv->pmc;
+	u32 tmp;
+
+	if (parent_rate != rate && (parent_rate / 2) != rate)
+		return -EINVAL;
+
+	pmc_lock(pmc);
+	tmp = pmc_read(pmc, AT91_PMC_MCKR) & ~AT91_PMC_PLLADIV2;
+	if ((parent_rate / 2) == rate)
+		tmp |= AT91_PMC_PLLADIV2;
+	pmc_write(pmc, AT91_PMC_MCKR, tmp);
+	pmc_unlock(pmc);
+
+	return 0;
+}
+
+static const struct clk_ops plldiv_ops = {
+	.recalc_rate = clk_plldiv_recalc_rate,
+	.round_rate = clk_plldiv_round_rate,
+	.set_rate = clk_plldiv_set_rate,
+};
+
+static struct clk * __init
+at91_clk_register_plldiv(struct at91_pmc *pmc, const char *name,
+			 const char *parent_name)
+{
+	struct clk_plldiv *plldiv;
+	struct clk *clk = NULL;
+	struct clk_init_data init;
+
+	plldiv = kzalloc(sizeof(*plldiv), GFP_KERNEL);
+	if (!plldiv)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &plldiv_ops;
+	init.parent_names = parent_name ? &parent_name : NULL;
+	init.num_parents = parent_name ? 1 : 0;
+	init.flags = CLK_SET_RATE_GATE;
+
+	plldiv->hw.init = &init;
+	plldiv->pmc = pmc;
+
+	clk = clk_register(NULL, &plldiv->hw);
+
+	if (IS_ERR(clk))
+		kfree(plldiv);
+
+	return clk;
+}
+
+static void __init
+of_at91_clk_plldiv_setup(struct device_node *np, struct at91_pmc *pmc)
+{
+	struct clk *clk;
+	const char *parent_name;
+	const char *name = np->name;
+
+	parent_name = of_clk_get_parent_name(np, 0);
+
+	of_property_read_string(np, "clock-output-names", &name);
+
+	clk = at91_clk_register_plldiv(pmc, name, parent_name);
+
+	if (IS_ERR(clk))
+		return;
+
+	of_clk_add_provider(np, of_clk_src_simple_get, clk);
+	return;
+}
+
+void __init of_at91sam9x5_clk_plldiv_setup(struct device_node *np,
+					   struct at91_pmc *pmc)
+{
+	of_at91_clk_plldiv_setup(np, pmc);
+}