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Diffstat (limited to 'arch/sh/kernel/cpu/sh3/clock-sh7712.c')
-rw-r--r--arch/sh/kernel/cpu/sh3/clock-sh7712.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh3/clock-sh7712.c b/arch/sh/kernel/cpu/sh3/clock-sh7712.c
new file mode 100644
index 000000000000..54f54df51ef0
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh3/clock-sh7712.c
@@ -0,0 +1,71 @@
+/*
+ * arch/sh/kernel/cpu/sh3/clock-sh7712.c
+ *
+ * SH7712 support for the clock framework
+ *
+ * Copyright (C) 2007 Andrew Murray <amurray@mpc-data.co.uk>
+ *
+ * Based on arch/sh/kernel/cpu/sh3/clock-sh3.c
+ * Copyright (C) 2005 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 multipliers[] = { 1, 2, 3 };
+static int divisors[] = { 1, 2, 3, 4, 6 };
+
+static void master_clk_init(struct clk *clk)
+{
+ int frqcr = ctrl_inw(FRQCR);
+ int idx = (frqcr & 0x0300) >> 8;
+
+ clk->rate *= multipliers[idx];
+}
+
+static struct clk_ops sh7712_master_clk_ops = {
+ .init = master_clk_init,
+};
+
+static void module_clk_recalc(struct clk *clk)
+{
+ int frqcr = ctrl_inw(FRQCR);
+ int idx = frqcr & 0x0007;
+
+ clk->rate = clk->parent->rate / divisors[idx];
+}
+
+static struct clk_ops sh7712_module_clk_ops = {
+ .recalc = module_clk_recalc,
+};
+
+static void cpu_clk_recalc(struct clk *clk)
+{
+ int frqcr = ctrl_inw(FRQCR);
+ int idx = (frqcr & 0x0030) >> 4;
+
+ clk->rate = clk->parent->rate / divisors[idx];
+}
+
+static struct clk_ops sh7712_cpu_clk_ops = {
+ .recalc = cpu_clk_recalc,
+};
+
+static struct clk_ops *sh7712_clk_ops[] = {
+ &sh7712_master_clk_ops,
+ &sh7712_module_clk_ops,
+ &sh7712_cpu_clk_ops,
+};
+
+void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
+{
+ if (idx < ARRAY_SIZE(sh7712_clk_ops))
+ *ops = sh7712_clk_ops[idx];
+}
+