summaryrefslogtreecommitdiffstats
path: root/arch/sh/kernel/cpu/sh4/clock-sh7780.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/sh/kernel/cpu/sh4/clock-sh7780.c')
-rw-r--r--arch/sh/kernel/cpu/sh4/clock-sh7780.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh4/clock-sh7780.c b/arch/sh/kernel/cpu/sh4/clock-sh7780.c
new file mode 100644
index 000000000000..93ad367342c9
--- /dev/null
+++ b/arch/sh/kernel/cpu/sh4/clock-sh7780.c
@@ -0,0 +1,126 @@
+/*
+ * arch/sh/kernel/cpu/sh4/clock-sh7780.c
+ *
+ * SH7780 support for the clock framework
+ *
+ * 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 ifc_divisors[] = { 2, 4 };
+static int bfc_divisors[] = { 1, 1, 1, 8, 12, 16, 24, 1 };
+static int pfc_divisors[] = { 1, 24, 24, 1 };
+static int cfc_divisors[] = { 1, 1, 4, 1, 6, 1, 1, 1 };
+
+static void master_clk_init(struct clk *clk)
+{
+ clk->rate *= pfc_divisors[ctrl_inl(FRQCR) & 0x0003];
+}
+
+static struct clk_ops sh7780_master_clk_ops = {
+ .init = master_clk_init,
+};
+
+static void module_clk_recalc(struct clk *clk)
+{
+ int idx = (ctrl_inl(FRQCR) & 0x0003);
+ clk->rate = clk->parent->rate / pfc_divisors[idx];
+}
+
+static struct clk_ops sh7780_module_clk_ops = {
+ .recalc = module_clk_recalc,
+};
+
+static void bus_clk_recalc(struct clk *clk)
+{
+ int idx = ((ctrl_inl(FRQCR) >> 16) & 0x0007);
+ clk->rate = clk->parent->rate / bfc_divisors[idx];
+}
+
+static struct clk_ops sh7780_bus_clk_ops = {
+ .recalc = bus_clk_recalc,
+};
+
+static void cpu_clk_recalc(struct clk *clk)
+{
+ int idx = ((ctrl_inl(FRQCR) >> 24) & 0x0001);
+ clk->rate = clk->parent->rate / ifc_divisors[idx];
+}
+
+static struct clk_ops sh7780_cpu_clk_ops = {
+ .recalc = cpu_clk_recalc,
+};
+
+static struct clk_ops *sh7780_clk_ops[] = {
+ &sh7780_master_clk_ops,
+ &sh7780_module_clk_ops,
+ &sh7780_bus_clk_ops,
+ &sh7780_cpu_clk_ops,
+};
+
+void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
+{
+ if (idx < ARRAY_SIZE(sh7780_clk_ops))
+ *ops = sh7780_clk_ops[idx];
+}
+
+static void shyway_clk_recalc(struct clk *clk)
+{
+ int idx = ((ctrl_inl(FRQCR) >> 20) & 0x0007);
+ clk->rate = clk->parent->rate / cfc_divisors[idx];
+}
+
+static struct clk_ops sh7780_shyway_clk_ops = {
+ .recalc = shyway_clk_recalc,
+};
+
+static struct clk sh7780_shyway_clk = {
+ .name = "shyway_clk",
+ .flags = CLK_ALWAYS_ENABLED,
+ .ops = &sh7780_shyway_clk_ops,
+};
+
+/*
+ * Additional SH7780-specific on-chip clocks that aren't already part of the
+ * clock framework
+ */
+static struct clk *sh7780_onchip_clocks[] = {
+ &sh7780_shyway_clk,
+};
+
+static int __init sh7780_clk_init(void)
+{
+ struct clk *clk = clk_get("master_clk");
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(sh7780_onchip_clocks); i++) {
+ struct clk *clkp = sh7780_onchip_clocks[i];
+
+ clkp->parent = clk;
+ clk_register(clkp);
+ clk_enable(clkp);
+ }
+
+ /*
+ * Now that we have the rest of the clocks registered, we need to
+ * force the parent clock to propagate so that these clocks will
+ * automatically figure out their rate. We cheat by handing the
+ * parent clock its current rate and forcing child propagation.
+ */
+ clk_set_rate(clk, clk_get_rate(clk));
+
+ clk_put(clk);
+
+ return 0;
+}
+
+arch_initcall(sh7780_clk_init);
+