This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / sh / kernel / cpu / sh3 / clock-sh7709.c

diff --git a/arch/sh/kernel/cpu/sh3/clock-sh7709.c b/arch/sh/kernel/cpu/sh3/clock-sh7709.c
new file mode 100644 (file)
index 0000000..10461a7
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh3/clock-sh7709.c
@@ -0,0 +1,96 @@
+/*
+ * arch/sh/kernel/cpu/sh3/clock-sh7709.c
+ *
+ * SH7709 support for the clock framework
+ *
+ *  Copyright (C) 2005  Andriy Skulysh
+ *
+ * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.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 stc_multipliers[] = { 1, 2, 4, 8, 3, 6, 1, 1 };
+static int ifc_divisors[]    = { 1, 2, 4, 1, 3, 1, 1, 1 };
+static int pfc_divisors[]    = { 1, 2, 4, 1, 3, 6, 1, 1 };
+
+static void set_bus_parent(struct clk *clk)
+{
+       struct clk *bus_clk = clk_get("bus_clk");
+       clk->parent = bus_clk;
+       clk_put(bus_clk);
+}
+
+static void master_clk_init(struct clk *clk)
+{
+       int frqcr = ctrl_inw(FRQCR);
+       int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
+
+       clk->rate *= pfc_divisors[idx];
+}
+
+static struct clk_ops sh7709_master_clk_ops = {
+       .init           = master_clk_init,
+};
+
+static void module_clk_recalc(struct clk *clk)
+{
+       int frqcr = ctrl_inw(FRQCR);
+       int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);
+
+       clk->rate = clk->parent->rate / pfc_divisors[idx];
+}
+
+static struct clk_ops sh7709_module_clk_ops = {
+#ifdef CLOCK_MODE_0_1_2_7
+       .init           = set_bus_parent,
+#endif
+       .recalc         = module_clk_recalc,
+};
+
+static void bus_clk_recalc(struct clk *clk)
+{
+       int frqcr = ctrl_inw(FRQCR);
+       int idx = (frqcr & 0x0080) ?
+               ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1;
+
+       clk->rate = clk->parent->rate * stc_multipliers[idx];
+}
+
+static struct clk_ops sh7709_bus_clk_ops = {
+       .recalc         = bus_clk_recalc,
+};
+
+static void cpu_clk_recalc(struct clk *clk)
+{
+       int frqcr = ctrl_inw(FRQCR);
+       int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);
+
+       clk->rate = clk->parent->rate / ifc_divisors[idx];
+}
+
+static struct clk_ops sh7709_cpu_clk_ops = {
+       .init           = set_bus_parent,
+       .recalc         = cpu_clk_recalc,
+};
+
+static struct clk_ops *sh7709_clk_ops[] = {
+       &sh7709_master_clk_ops,
+       &sh7709_module_clk_ops,
+       &sh7709_bus_clk_ops,
+       &sh7709_cpu_clk_ops,
+};
+
+void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
+{
+       if (idx < ARRAY_SIZE(sh7709_clk_ops))
+               *ops = sh7709_clk_ops[idx];
+}