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Diffstat (limited to 'arch/sh/kernel/cpu/sh3/clock-sh7705.c')
-rw-r--r--arch/sh/kernel/cpu/sh3/clock-sh7705.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/arch/sh/kernel/cpu/sh3/clock-sh7705.c b/arch/sh/kernel/cpu/sh3/clock-sh7705.c
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+++ b/arch/sh/kernel/cpu/sh3/clock-sh7705.c
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+/*
+ * arch/sh/kernel/cpu/sh3/clock-sh7705.c
+ *
+ * SH7705 support for the clock framework
+ *
+ * Copyright (C) 2005 Paul Mundt
+ *
+ * FRQCR parsing hacked out of arch/sh/kernel/time.c
+ *
+ * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka
+ * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
+ * Copyright (C) 2002, 2003, 2004 Paul Mundt
+ * Copyright (C) 2002 M. R. Brown <mrbrown@linux-sh.org>
+ *
+ * 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>
+
+/*
+ * SH7705 uses the same divisors as the generic SH-3 case, it's just the
+ * FRQCR layout that is a bit different..
+ */
+static int stc_multipliers[] = { 1, 2, 3, 4, 6, 1, 1, 1 };
+static int ifc_divisors[] = { 1, 2, 3, 4, 1, 1, 1, 1 };
+static int pfc_divisors[] = { 1, 2, 3, 4, 6, 1, 1, 1 };
+
+static void master_clk_init(struct clk *clk)
+{
+ clk->rate *= pfc_divisors[ctrl_inw(FRQCR) & 0x0003];
+}
+
+static struct clk_ops sh7705_master_clk_ops = {
+ .init = master_clk_init,
+};
+
+static void module_clk_recalc(struct clk *clk)
+{
+ int idx = ctrl_inw(FRQCR) & 0x0003;
+ clk->rate = clk->parent->rate / pfc_divisors[idx];
+}
+
+static struct clk_ops sh7705_module_clk_ops = {
+ .recalc = module_clk_recalc,
+};
+
+static void bus_clk_recalc(struct clk *clk)
+{
+ int idx = (ctrl_inw(FRQCR) & 0x0300) >> 8;
+ clk->rate = clk->parent->rate / stc_multipliers[idx];
+}
+
+static struct clk_ops sh7705_bus_clk_ops = {
+ .recalc = bus_clk_recalc,
+};
+
+static void cpu_clk_recalc(struct clk *clk)
+{
+ int idx = (ctrl_inw(FRQCR) & 0x0030) >> 4;
+ clk->rate = clk->parent->rate / ifc_divisors[idx];
+}
+
+static struct clk_ops sh7705_cpu_clk_ops = {
+ .recalc = cpu_clk_recalc,
+};
+
+static struct clk_ops *sh7705_clk_ops[] = {
+ &sh7705_master_clk_ops,
+ &sh7705_module_clk_ops,
+ &sh7705_bus_clk_ops,
+ &sh7705_cpu_clk_ops,
+};
+
+void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
+{
+ if (idx < ARRAY_SIZE(sh7705_clk_ops))
+ *ops = sh7705_clk_ops[idx];
+}
+
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