clk: renesas: move drivers to renesas directory

This is part of an ongoing process to migrate from ARCH_SHMOBILE to
ARCH_RENESAS the motivation for which being that RENESAS seems to be a more
appropriate name than SHMOBILE for the majority of Renesas ARM based SoCs.

Along with the above mentioned Kconfig changes it seems appropriate
to also rename directories that only hold drivers for such SoCs.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

1 files changed, 106 insertions, 0 deletions

diff --git a/drivers/clk/renesas/clk-rz.c b/drivers/clk/renesas/clk-rz.c
new file mode 100644
index 0000000..9766e3c
--- /dev/null
+++ b/drivers/clk/renesas/clk-rz.c
@@ -0,0 +1,106 @@
+/*
+ * rz Core CPG Clocks
+ *
+ * Copyright (C) 2013 Ideas On Board SPRL
+ * Copyright (C) 2014 Wolfram Sang, Sang Engineering <wsa@sang-engineering.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; version 2 of the License.
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clk/shmobile.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+
+struct rz_cpg {
+	struct clk_onecell_data data;
+	void __iomem *reg;
+};
+
+#define CPG_FRQCR	0x10
+#define CPG_FRQCR2	0x14
+
+/* -----------------------------------------------------------------------------
+ * Initialization
+ */
+
+static struct clk * __init
+rz_cpg_register_clock(struct device_node *np, struct rz_cpg *cpg, const char *name)
+{
+	u32 val;
+	unsigned mult;
+	static const unsigned frqcr_tab[4] = { 3, 2, 0, 1 };
+
+	if (strcmp(name, "pll") == 0) {
+		/* FIXME: cpg_mode should be read from GPIO. But no GPIO support yet */
+		unsigned cpg_mode = 0; /* hardcoded to EXTAL for now */
+		const char *parent_name = of_clk_get_parent_name(np, cpg_mode);
+
+		mult = cpg_mode ? (32 / 4) : 30;
+
+		return clk_register_fixed_factor(NULL, name, parent_name, 0, mult, 1);
+	}
+
+	/* If mapping regs failed, skip non-pll clocks. System will boot anyhow */
+	if (!cpg->reg)
+		return ERR_PTR(-ENXIO);
+
+	/* FIXME:"i" and "g" are variable clocks with non-integer dividers (e.g. 2/3)
+	 * and the constraint that always g <= i. To get the rz platform started,
+	 * let them run at fixed current speed and implement the details later.
+	 */
+	if (strcmp(name, "i") == 0)
+		val = (clk_readl(cpg->reg + CPG_FRQCR) >> 8) & 3;
+	else if (strcmp(name, "g") == 0)
+		val = clk_readl(cpg->reg + CPG_FRQCR2) & 3;
+	else
+		return ERR_PTR(-EINVAL);
+
+	mult = frqcr_tab[val];
+	return clk_register_fixed_factor(NULL, name, "pll", 0, mult, 3);
+}
+
+static void __init rz_cpg_clocks_init(struct device_node *np)
+{
+	struct rz_cpg *cpg;
+	struct clk **clks;
+	unsigned i;
+	int num_clks;
+
+	num_clks = of_property_count_strings(np, "clock-output-names");
+	if (WARN(num_clks <= 0, "can't count CPG clocks\n"))
+		return;
+
+	cpg = kzalloc(sizeof(*cpg), GFP_KERNEL);
+	clks = kzalloc(num_clks * sizeof(*clks), GFP_KERNEL);
+	BUG_ON(!cpg || !clks);
+
+	cpg->data.clks = clks;
+	cpg->data.clk_num = num_clks;
+
+	cpg->reg = of_iomap(np, 0);
+
+	for (i = 0; i < num_clks; ++i) {
+		const char *name;
+		struct clk *clk;
+
+		of_property_read_string_index(np, "clock-output-names", i, &name);
+
+		clk = rz_cpg_register_clock(np, cpg, name);
+		if (IS_ERR(clk))
+			pr_err("%s: failed to register %s %s clock (%ld)\n",
+			       __func__, np->name, name, PTR_ERR(clk));
+		else
+			cpg->data.clks[i] = clk;
+	}
+
+	of_clk_add_provider(np, of_clk_src_onecell_get, &cpg->data);
+
+	cpg_mstp_add_clk_domain(np);
+}
+CLK_OF_DECLARE(rz_cpg_clks, "renesas,rz-cpg-clocks", rz_cpg_clocks_init);