sh: Add initial support for SH7757 CPU subtype

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

1 files changed, 130 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7757.c b/arch/sh/kernel/cpu/sh4a/clock-sh7757.c
new file mode 100644
index 00000000000..ddc235ca966
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7757.c
@@ -0,0 +1,130 @@
+/*
+ * arch/sh/kernel/cpu/sh4/clock-sh7757.c
+ *
+ * SH7757 support for the clock framework
+ *
+ *  Copyright (C) 2009  Renesas Solutions Corp.
+ *
+ * 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 <linux/io.h>
+#include <asm/clock.h>
+#include <asm/freq.h>
+
+static int ifc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1,
+			      16, 1, 1, 32, 1, 1, 1, 1 };
+static int sfc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1,
+			      16, 1, 1, 32, 1, 1, 1, 1 };
+static int bfc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1,
+			      16, 1, 1, 32, 1, 1, 1, 1 };
+static int p1fc_divisors[] = { 2, 1, 4, 1, 1, 8, 1, 1,
+			       16, 1, 1, 32, 1, 1, 1, 1 };
+
+static void master_clk_init(struct clk *clk)
+{
+	clk->rate = CONFIG_SH_PCLK_FREQ * 16;
+}
+
+static struct clk_ops sh7757_master_clk_ops = {
+	.init		= master_clk_init,
+};
+
+static void module_clk_recalc(struct clk *clk)
+{
+	int idx = ctrl_inl(FRQCR) & 0x0000000f;
+	clk->rate = clk->parent->rate / p1fc_divisors[idx];
+}
+
+static struct clk_ops sh7757_module_clk_ops = {
+	.recalc		= module_clk_recalc,
+};
+
+static void bus_clk_recalc(struct clk *clk)
+{
+	int idx = (ctrl_inl(FRQCR) >> 8) & 0x0000000f;
+	clk->rate = clk->parent->rate / bfc_divisors[idx];
+}
+
+static struct clk_ops sh7757_bus_clk_ops = {
+	.recalc		= bus_clk_recalc,
+};
+
+static void cpu_clk_recalc(struct clk *clk)
+{
+	int idx = (ctrl_inl(FRQCR) >> 20) & 0x0000000f;
+	clk->rate = clk->parent->rate / ifc_divisors[idx];
+}
+
+static struct clk_ops sh7757_cpu_clk_ops = {
+	.recalc		= cpu_clk_recalc,
+};
+
+static struct clk_ops *sh7757_clk_ops[] = {
+	&sh7757_master_clk_ops,
+	&sh7757_module_clk_ops,
+	&sh7757_bus_clk_ops,
+	&sh7757_cpu_clk_ops,
+};
+
+void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
+{
+	if (idx < ARRAY_SIZE(sh7757_clk_ops))
+		*ops = sh7757_clk_ops[idx];
+}
+
+static void shyway_clk_recalc(struct clk *clk)
+{
+	int idx = (ctrl_inl(FRQCR) >> 12) & 0x0000000f;
+	clk->rate = clk->parent->rate / sfc_divisors[idx];
+}
+
+static struct clk_ops sh7757_shyway_clk_ops = {
+	.recalc		= shyway_clk_recalc,
+};
+
+static struct clk sh7757_shyway_clk = {
+	.name		= "shyway_clk",
+	.flags		= CLK_ENABLE_ON_INIT,
+	.ops		= &sh7757_shyway_clk_ops,
+};
+
+/*
+ * Additional sh7757-specific on-chip clocks that aren't already part of the
+ * clock framework
+ */
+static struct clk *sh7757_onchip_clocks[] = {
+	&sh7757_shyway_clk,
+};
+
+static int __init sh7757_clk_init(void)
+{
+	struct clk *clk = clk_get(NULL, "master_clk");
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(sh7757_onchip_clocks); i++) {
+		struct clk *clkp = sh7757_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(sh7757_clk_init);
+