1 files changed, 165 insertions, 0 deletions
diff --git a/arch/mips/loongson1/common/clock.c b/arch/mips/loongson1/common/clock.c
new file mode 100644
index 0000000..2d98fb0
--- /dev/null
+++ b/arch/mips/loongson1/common/clock.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2011 Zhang, Keguang <keguang.zhang@gmail.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <asm/clock.h>
+#include <asm/time.h>
+
+#include <loongson1.h>
+
+static LIST_HEAD(clocks);
+static DEFINE_MUTEX(clocks_mutex);
+
+struct clk *clk_get(struct device *dev, const char *name)
+{
+	struct clk *c;
+	struct clk *ret = NULL;
+
+	mutex_lock(&clocks_mutex);
+	list_for_each_entry(c, &clocks, node) {
+		if (!strcmp(c->name, name)) {
+			ret = c;
+			break;
+		}
+	}
+	mutex_unlock(&clocks_mutex);
+
+	return ret;
+}
+EXPORT_SYMBOL(clk_get);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+	return clk->rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+static void pll_clk_init(struct clk *clk)
+{
+	u32 pll;
+
+	pll = __raw_readl(LS1X_CLK_PLL_FREQ);
+	clk->rate = (12 + (pll & 0x3f)) * 33 / 2
+			+ ((pll >> 8) & 0x3ff) * 33 / 1024 / 2;
+	clk->rate *= 1000000;
+}
+
+static void cpu_clk_init(struct clk *clk)
+{
+	u32 pll, ctrl;
+
+	pll = clk_get_rate(clk->parent);
+	ctrl = __raw_readl(LS1X_CLK_PLL_DIV) & DIV_CPU;
+	clk->rate = pll / (ctrl >> DIV_CPU_SHIFT);
+}
+
+static void ddr_clk_init(struct clk *clk)
+{
+	u32 pll, ctrl;
+
+	pll = clk_get_rate(clk->parent);
+	ctrl = __raw_readl(LS1X_CLK_PLL_DIV) & DIV_DDR;
+	clk->rate = pll / (ctrl >> DIV_DDR_SHIFT);
+}
+
+static void dc_clk_init(struct clk *clk)
+{
+	u32 pll, ctrl;
+
+	pll = clk_get_rate(clk->parent);
+	ctrl = __raw_readl(LS1X_CLK_PLL_DIV) & DIV_DC;
+	clk->rate = pll / (ctrl >> DIV_DC_SHIFT);
+}
+
+static struct clk_ops pll_clk_ops = {
+	.init	= pll_clk_init,
+};
+
+static struct clk_ops cpu_clk_ops = {
+	.init	= cpu_clk_init,
+};
+
+static struct clk_ops ddr_clk_ops = {
+	.init	= ddr_clk_init,
+};
+
+static struct clk_ops dc_clk_ops = {
+	.init	= dc_clk_init,
+};
+
+static struct clk pll_clk = {
+	.name	= "pll",
+	.ops	= &pll_clk_ops,
+};
+
+static struct clk cpu_clk = {
+	.name	= "cpu",
+	.parent = &pll_clk,
+	.ops	= &cpu_clk_ops,
+};
+
+static struct clk ddr_clk = {
+	.name	= "ddr",
+	.parent = &pll_clk,
+	.ops	= &ddr_clk_ops,
+};
+
+static struct clk dc_clk = {
+	.name	= "dc",
+	.parent = &pll_clk,
+	.ops	= &dc_clk_ops,
+};
+
+int clk_register(struct clk *clk)
+{
+	mutex_lock(&clocks_mutex);
+	list_add(&clk->node, &clocks);
+	if (clk->ops->init)
+		clk->ops->init(clk);
+	mutex_unlock(&clocks_mutex);
+
+	return 0;
+}
+EXPORT_SYMBOL(clk_register);
+
+static struct clk *ls1x_clks[] = {
+	&pll_clk,
+	&cpu_clk,
+	&ddr_clk,
+	&dc_clk,
+};
+
+int __init ls1x_clock_init(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ls1x_clks); i++)
+		clk_register(ls1x_clks[i]);
+
+	return 0;
+}
+
+void __init plat_time_init(void)
+{
+	struct clk *clk;
+
+	/* Initialize LS1X clocks */
+	ls1x_clock_init();
+
+	/* setup mips r4k timer */
+	clk = clk_get(NULL, "cpu");
+	if (IS_ERR(clk))
+		panic("unable to get dc clock, err=%ld", PTR_ERR(clk));
+
+	mips_hpt_frequency = clk_get_rate(clk) / 2;
+}