Initial import

1 files changed, 140 insertions, 0 deletions

diff --git a/arch/mips/loongson/lemote-2f/clock.c b/arch/mips/loongson/lemote-2f/clock.c
new file mode 100644
index 000000000..462e34d46
--- /dev/null
+++ b/arch/mips/loongson/lemote-2f/clock.c
@@ -0,0 +1,140 @@
+/*
+ * Copyright (C) 2006 - 2008 Lemote Inc. & Insititute of Computing Technology
+ * Author: Yanhua, yanh@lemote.com
+ *
+ * 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/clk.h>
+#include <linux/cpufreq.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+
+#include <asm/clock.h>
+#include <asm/mach-loongson/loongson.h>
+
+static LIST_HEAD(clock_list);
+static DEFINE_SPINLOCK(clock_lock);
+static DEFINE_MUTEX(clock_list_sem);
+
+/* Minimum CLK support */
+enum {
+	DC_ZERO, DC_25PT = 2, DC_37PT, DC_50PT, DC_62PT, DC_75PT,
+	DC_87PT, DC_DISABLE, DC_RESV
+};
+
+struct cpufreq_frequency_table loongson2_clockmod_table[] = {
+	{0, DC_RESV, CPUFREQ_ENTRY_INVALID},
+	{0, DC_ZERO, CPUFREQ_ENTRY_INVALID},
+	{0, DC_25PT, 0},
+	{0, DC_37PT, 0},
+	{0, DC_50PT, 0},
+	{0, DC_62PT, 0},
+	{0, DC_75PT, 0},
+	{0, DC_87PT, 0},
+	{0, DC_DISABLE, 0},
+	{0, DC_RESV, CPUFREQ_TABLE_END},
+};
+EXPORT_SYMBOL_GPL(loongson2_clockmod_table);
+
+static struct clk cpu_clk = {
+	.name = "cpu_clk",
+	.flags = CLK_ALWAYS_ENABLED | CLK_RATE_PROPAGATES,
+	.rate = 800000000,
+};
+
+struct clk *clk_get(struct device *dev, const char *id)
+{
+	return &cpu_clk;
+}
+EXPORT_SYMBOL(clk_get);
+
+static void propagate_rate(struct clk *clk)
+{
+	struct clk *clkp;
+
+	list_for_each_entry(clkp, &clock_list, node) {
+		if (likely(clkp->parent != clk))
+			continue;
+		if (likely(clkp->ops && clkp->ops->recalc))
+			clkp->ops->recalc(clkp);
+		if (unlikely(clkp->flags & CLK_RATE_PROPAGATES))
+			propagate_rate(clkp);
+	}
+}
+
+int clk_enable(struct clk *clk)
+{
+	return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	return (unsigned long)clk->rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+void clk_put(struct clk *clk)
+{
+}
+EXPORT_SYMBOL(clk_put);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+	unsigned int rate_khz = rate / 1000;
+	struct cpufreq_frequency_table *pos;
+	int ret = 0;
+	int regval;
+
+	if (likely(clk->ops && clk->ops->set_rate)) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&clock_lock, flags);
+		ret = clk->ops->set_rate(clk, rate, 0);
+		spin_unlock_irqrestore(&clock_lock, flags);
+	}
+
+	if (unlikely(clk->flags & CLK_RATE_PROPAGATES))
+		propagate_rate(clk);
+
+	cpufreq_for_each_valid_entry(pos, loongson2_clockmod_table)
+		if (rate_khz == pos->frequency)
+			break;
+	if (rate_khz != pos->frequency)
+		return -ENOTSUPP;
+
+	clk->rate = rate;
+
+	regval = LOONGSON_CHIPCFG(0);
+	regval = (regval & ~0x7) | (pos->driver_data - 1);
+	LOONGSON_CHIPCFG(0) = regval;
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(clk_set_rate);
+
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+	if (likely(clk->ops && clk->ops->round_rate)) {
+		unsigned long flags, rounded;
+
+		spin_lock_irqsave(&clock_lock, flags);
+		rounded = clk->ops->round_rate(clk, rate);
+		spin_unlock_irqrestore(&clock_lock, flags);
+
+		return rounded;
+	}
+
+	return rate;
+}
+EXPORT_SYMBOL_GPL(clk_round_rate);