sh: sh7712 clock support

This patch provides specific clock support for the SH7712.

Signed-off-by: Andrew Murray <amurray@mpc-data.co.uk>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 72 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/sh3/Makefile b/arch/sh/kernel/cpu/sh3/Makefile
index 1afd05e62d1c..3ae4d9111f19 100644
--- a/arch/sh/kernel/cpu/sh3/Makefile
+++ b/arch/sh/kernel/cpu/sh3/Makefile
@@ -22,5 +22,6 @@ clock-$(CONFIG_CPU_SUBTYPE_SH7706)	:= clock-sh7706.o
 clock-$(CONFIG_CPU_SUBTYPE_SH7709)      := clock-sh7709.o
 clock-$(CONFIG_CPU_SUBTYPE_SH7710)      := clock-sh7710.o
 clock-$(CONFIG_CPU_SUBTYPE_SH7720)      := clock-sh7710.o
+clock-$(CONFIG_CPU_SUBTYPE_SH7712)      := clock-sh7712.o
 
 obj-y   += $(clock-y)
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];
+}
+