1 files changed, 86 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh3/clock-sh3.c b/arch/sh/kernel/cpu/sh3/clock-sh3.c
new file mode 100644
index 000000000..d7765728c
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh3/clock-sh3.c
@@ -0,0 +1,86 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * arch/sh/kernel/cpu/sh3/clock-sh3.c
+ *
+ * Generic SH-3 support for the clock framework
+ *
+ *  Copyright (C) 2005  Paul Mundt
+ *
+ * FRQCR parsing hacked out of arch/sh/kernel/time.c
+ *
+ *  Copyright (C) 1999  Tetsuya Okada & Niibe Yutaka
+ *  Copyright (C) 2000  Philipp Rumpf <prumpf@tux.org>
+ *  Copyright (C) 2002, 2003, 2004  Paul Mundt
+ *  Copyright (C) 2002  M. R. Brown  <mrbrown@linux-sh.org>
+ */
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <asm/clock.h>
+#include <asm/freq.h>
+#include <asm/io.h>
+
+static int stc_multipliers[] = { 1, 2, 3, 4, 6, 1, 1, 1 };
+static int ifc_divisors[]    = { 1, 2, 3, 4, 1, 1, 1, 1 };
+static int pfc_divisors[]    = { 1, 2, 3, 4, 6, 1, 1, 1 };
+
+static void master_clk_init(struct clk *clk)
+{
+	int frqcr = __raw_readw(FRQCR);
+	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
+
+	clk->rate *= pfc_divisors[idx];
+}
+
+static struct sh_clk_ops sh3_master_clk_ops = {
+	.init		= master_clk_init,
+};
+
+static unsigned long module_clk_recalc(struct clk *clk)
+{
+	int frqcr = __raw_readw(FRQCR);
+	int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
+
+	return clk->parent->rate / pfc_divisors[idx];
+}
+
+static struct sh_clk_ops sh3_module_clk_ops = {
+	.recalc		= module_clk_recalc,
+};
+
+static unsigned long bus_clk_recalc(struct clk *clk)
+{
+	int frqcr = __raw_readw(FRQCR);
+	int idx = ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4);
+
+	return clk->parent->rate / stc_multipliers[idx];
+}
+
+static struct sh_clk_ops sh3_bus_clk_ops = {
+	.recalc		= bus_clk_recalc,
+};
+
+static unsigned long cpu_clk_recalc(struct clk *clk)
+{
+	int frqcr = __raw_readw(FRQCR);
+	int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
+
+	return clk->parent->rate / ifc_divisors[idx];
+}
+
+static struct sh_clk_ops sh3_cpu_clk_ops = {
+	.recalc		= cpu_clk_recalc,
+};
+
+static struct sh_clk_ops *sh3_clk_ops[] = {
+	&sh3_master_clk_ops,
+	&sh3_module_clk_ops,
+	&sh3_bus_clk_ops,
+	&sh3_cpu_clk_ops,
+};
+
+void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
+{
+	if (idx < ARRAY_SIZE(sh3_clk_ops))
+		*ops = sh3_clk_ops[idx];
+}
+