sh: Add support for SH7763 CPU subtype.

Signed-off-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 126 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7763.c b/arch/sh/kernel/cpu/sh4a/clock-sh7763.c
new file mode 100644
index 000000000000..45889d412c80
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7763.c
@@ -0,0 +1,126 @@
+/*
+ * arch/sh/kernel/cpu/sh4a/clock-sh7763.c
+ *
+ * SH7763 support for the clock framework
+ *
+ *  Copyright (C) 2005  Paul Mundt
+ *  Copyright (C) 2007  Yoshihiro Shimoda
+ *
+ * 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 bfc_divisors[] = { 1, 1, 1, 8, 1, 1, 1, 1 };
+static int p0fc_divisors[] = { 1, 1, 1, 8, 1, 1, 1, 1 };
+static int p1fc_divisors[] = { 1, 1, 1, 16, 1, 1, 1, 1 };
+static int cfc_divisors[] = { 1, 1, 4, 1, 1, 1, 1, 1 };
+
+static void master_clk_init(struct clk *clk)
+{
+	clk->rate *= p0fc_divisors[(ctrl_inl(FRQCR) >> 4) & 0x07];
+}
+
+static struct clk_ops sh7763_master_clk_ops = {
+	.init		= master_clk_init,
+};
+
+static void module_clk_recalc(struct clk *clk)
+{
+	int idx = ((ctrl_inl(FRQCR) >> 4) & 0x07);
+	clk->rate = clk->parent->rate / p0fc_divisors[idx];
+}
+
+static struct clk_ops sh7763_module_clk_ops = {
+	.recalc		= module_clk_recalc,
+};
+
+static void bus_clk_recalc(struct clk *clk)
+{
+	int idx = ((ctrl_inl(FRQCR) >> 16) & 0x07);
+	clk->rate = clk->parent->rate / bfc_divisors[idx];
+}
+
+static struct clk_ops sh7763_bus_clk_ops = {
+	.recalc		= bus_clk_recalc,
+};
+
+static void cpu_clk_recalc(struct clk *clk)
+{
+	clk->rate = clk->parent->rate;
+}
+
+static struct clk_ops sh7763_cpu_clk_ops = {
+	.recalc		= cpu_clk_recalc,
+};
+
+static struct clk_ops *sh7763_clk_ops[] = {
+	&sh7763_master_clk_ops,
+	&sh7763_module_clk_ops,
+	&sh7763_bus_clk_ops,
+	&sh7763_cpu_clk_ops,
+};
+
+void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
+{
+	if (idx < ARRAY_SIZE(sh7763_clk_ops))
+		*ops = sh7763_clk_ops[idx];
+}
+
+static void shyway_clk_recalc(struct clk *clk)
+{
+	int idx = ((ctrl_inl(FRQCR) >> 20) & 0x07);
+	clk->rate = clk->parent->rate / cfc_divisors[idx];
+}
+
+static struct clk_ops sh7763_shyway_clk_ops = {
+	.recalc		= shyway_clk_recalc,
+};
+
+static struct clk sh7763_shyway_clk = {
+	.name		= "shyway_clk",
+	.flags		= CLK_ALWAYS_ENABLED,
+	.ops		= &sh7763_shyway_clk_ops,
+};
+
+/*
+ * Additional SH7763-specific on-chip clocks that aren't already part of the
+ * clock framework
+ */
+static struct clk *sh7763_onchip_clocks[] = {
+	&sh7763_shyway_clk,
+};
+
+static int __init sh7763_clk_init(void)
+{
+	struct clk *clk = clk_get(NULL, "master_clk");
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sh7763_onchip_clocks); i++) {
+		struct clk *clkp = sh7763_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(sh7763_clk_init);
+