sh: SH-5 clk fwk support.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/kernel/cpu/sh5/Makefile

@@ -5,3 +5,8 @@ obj-y := entry.o probe.o switchto.o
 
 obj-$(CONFIG_SH_FPU)		+= fpu.o
 obj-$(CONFIG_KALLSYMS)		+= unwind.o
+
+# Primary on-chip clocks (common)
+clock-$(CONFIG_CPU_SH5)		:= clock-sh5.o
+
+obj-y			+= $(clock-y)

arch/sh/kernel/cpu/sh5/clock-sh5.c

@@ -0,0 +1,79 @@
+/*
+ * arch/sh/kernel/cpu/sh5/clock-sh5.c
+ *
+ * SH-5 support for the clock framework
+ *
+ *  Copyright (C) 2008  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/io.h>
+
+static int ifc_table[] = { 2, 4, 6, 8, 10, 12, 16, 24 };
+
+/* Clock, Power and Reset Controller */
+#define	CPRC_BLOCK_OFF	0x01010000
+#define CPRC_BASE	(PHYS_PERIPHERAL_BLOCK + CPRC_BLOCK_OFF)
+
+static unsigned long cprc_base;
+
+static void master_clk_init(struct clk *clk)
+{
+	int idx = (ctrl_inl(cprc_base + 0x00) >> 6) & 0x0007;
+	clk->rate *= ifc_table[idx];
+}
+
+static struct clk_ops sh5_master_clk_ops = {
+	.init		= master_clk_init,
+};
+
+static void module_clk_recalc(struct clk *clk)
+{
+	int idx = (ctrl_inw(cprc_base) >> 12) & 0x0007;
+	clk->rate = clk->parent->rate / ifc_table[idx];
+}
+
+static struct clk_ops sh5_module_clk_ops = {
+	.recalc		= module_clk_recalc,
+};
+
+static void bus_clk_recalc(struct clk *clk)
+{
+	int idx = (ctrl_inw(cprc_base) >> 3) & 0x0007;
+	clk->rate = clk->parent->rate / ifc_table[idx];
+}
+
+static struct clk_ops sh5_bus_clk_ops = {
+	.recalc		= bus_clk_recalc,
+};
+
+static void cpu_clk_recalc(struct clk *clk)
+{
+	int idx = (ctrl_inw(cprc_base) & 0x0007);
+	clk->rate = clk->parent->rate / ifc_table[idx];
+}
+
+static struct clk_ops sh5_cpu_clk_ops = {
+	.recalc		= cpu_clk_recalc,
+};
+
+static struct clk_ops *sh5_clk_ops[] = {
+	&sh5_master_clk_ops,
+	&sh5_module_clk_ops,
+	&sh5_bus_clk_ops,
+	&sh5_cpu_clk_ops,
+};
+
+void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
+{
+	cprc_base = onchip_remap(CPRC_BASE, 1024, "CPRC");
+	BUG_ON(!cprc_base);
+
+	if (idx < ARRAY_SIZE(sh5_clk_ops))
+		*ops = sh5_clk_ops[idx];
+}