sh: Add support for SH7786 CPU subtype.

This adds preliminary support for the SH7786 CPU subtype.

While this is a dual-core CPU, only UP is supported for now. L2 cache
support is likewise not yet implemented.

More information on this particular CPU subtype is available at:

	http://www.renesas.com/fmwk.jsp?cnt=sh7786_root.jsp&fp=/products/mpumcu/superh_family/sh7780_series/sh7786_group/

Signed-off-by: Kuninori Morimoto <morimoto.kuninori@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh4a/clock-sh7786.c

@@ -0,0 +1,148 @@
+/*
+ * arch/sh/kernel/cpu/sh4a/clock-sh7786.c
+ *
+ * SH7786 support for the clock framework
+ *
+ * Copyright (C) 2008, 2009  Renesas Solutions Corp.
+ * Kuninori Morimoto <morimoto.kuninori@renesas.com>
+ *
+ * Based on SH7785
+ *  Copyright (C) 2007  Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <asm/clock.h>
+#include <asm/freq.h>
+#include <asm/io.h>
+
+static int ifc_divisors[] = { 1, 2, 4, 1 };
+static int sfc_divisors[] = { 1, 1, 4, 1 };
+static int bfc_divisors[] = { 1, 1, 1, 1, 1, 12, 16, 1,
+			     24, 32, 1, 1, 1, 1, 1, 1 };
+static int mfc_divisors[] = { 1, 1, 4, 1 };
+static int pfc_divisors[] = { 1, 1, 1, 1, 1, 1, 16, 1,
+			      24, 32, 1, 48, 1, 1, 1, 1 };
+
+static void master_clk_init(struct clk *clk)
+{
+	clk->rate *= pfc_divisors[ctrl_inl(FRQMR1) & 0x000f];
+}
+
+static struct clk_ops sh7786_master_clk_ops = {
+	.init		= master_clk_init,
+};
+
+static void module_clk_recalc(struct clk *clk)
+{
+	int idx = (ctrl_inl(FRQMR1) & 0x000f);
+	clk->rate = clk->parent->rate / pfc_divisors[idx];
+}
+
+static struct clk_ops sh7786_module_clk_ops = {
+	.recalc		= module_clk_recalc,
+};
+
+static void bus_clk_recalc(struct clk *clk)
+{
+	int idx = ((ctrl_inl(FRQMR1) >> 16) & 0x000f);
+	clk->rate = clk->parent->rate / bfc_divisors[idx];
+}
+
+static struct clk_ops sh7786_bus_clk_ops = {
+	.recalc		= bus_clk_recalc,
+};
+
+static void cpu_clk_recalc(struct clk *clk)
+{
+	int idx = ((ctrl_inl(FRQMR1) >> 28) & 0x0003);
+	clk->rate = clk->parent->rate / ifc_divisors[idx];
+}
+
+static struct clk_ops sh7786_cpu_clk_ops = {
+	.recalc		= cpu_clk_recalc,
+};
+
+static struct clk_ops *sh7786_clk_ops[] = {
+	&sh7786_master_clk_ops,
+	&sh7786_module_clk_ops,
+	&sh7786_bus_clk_ops,
+	&sh7786_cpu_clk_ops,
+};
+
+void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
+{
+	if (idx < ARRAY_SIZE(sh7786_clk_ops))
+		*ops = sh7786_clk_ops[idx];
+}
+
+static void shyway_clk_recalc(struct clk *clk)
+{
+	int idx = ((ctrl_inl(FRQMR1) >> 20) & 0x0003);
+	clk->rate = clk->parent->rate / sfc_divisors[idx];
+}
+
+static struct clk_ops sh7786_shyway_clk_ops = {
+	.recalc		= shyway_clk_recalc,
+};
+
+static struct clk sh7786_shyway_clk = {
+	.name		= "shyway_clk",
+	.flags		= CLK_ALWAYS_ENABLED,
+	.ops		= &sh7786_shyway_clk_ops,
+};
+
+static void ddr_clk_recalc(struct clk *clk)
+{
+	int idx = ((ctrl_inl(FRQMR1) >> 12) & 0x0003);
+	clk->rate = clk->parent->rate / mfc_divisors[idx];
+}
+
+static struct clk_ops sh7786_ddr_clk_ops = {
+	.recalc		= ddr_clk_recalc,
+};
+
+static struct clk sh7786_ddr_clk = {
+	.name		= "ddr_clk",
+	.flags		= CLK_ALWAYS_ENABLED,
+	.ops		= &sh7786_ddr_clk_ops,
+};
+
+/*
+ * Additional SH7786-specific on-chip clocks that aren't already part of the
+ * clock framework
+ */
+static struct clk *sh7786_onchip_clocks[] = {
+	&sh7786_shyway_clk,
+	&sh7786_ddr_clk,
+};
+
+static int __init sh7786_clk_init(void)
+{
+	struct clk *clk = clk_get(NULL, "master_clk");
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sh7786_onchip_clocks); i++) {
+		struct clk *clkp = sh7786_onchip_clocks[i];
+
+		clkp->parent = clk;
+		clk_register(clkp);
+		clk_enable(clkp);
+	}
+
+	/*
+	 * Now that we have the rest of the clocks registered, we need to
+	 * force the parent clock to propagate so that these clocks will
+	 * automatically figure out their rate. We cheat by handing the
+	 * parent clock its current rate and forcing child propagation.
+	 */
+	clk_set_rate(clk, clk_get_rate(clk));
+
+	clk_put(clk);
+
+	return 0;
+}
+arch_initcall(sh7786_clk_init);