1 files changed, 97 insertions, 0 deletions
diff --git a/drivers/clk/clk-moxart.c b/drivers/clk/clk-moxart.c
new file mode 100644
index 000000000..3786a0153
--- /dev/null
+++ b/drivers/clk/clk-moxart.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * MOXA ART SoCs clock driver.
+ *
+ * Copyright (C) 2013 Jonas Jensen
+ *
+ * Jonas Jensen <jonas.jensen@gmail.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/of_address.h>
+#include <linux/clkdev.h>
+
+static void __init moxart_of_pll_clk_init(struct device_node *node)
+{
+	void __iomem *base;
+	struct clk_hw *hw;
+	struct clk *ref_clk;
+	unsigned int mul;
+	const char *name = node->name;
+	const char *parent_name;
+
+	of_property_read_string(node, "clock-output-names", &name);
+	parent_name = of_clk_get_parent_name(node, 0);
+
+	base = of_iomap(node, 0);
+	if (!base) {
+		pr_err("%pOF: of_iomap failed\n", node);
+		return;
+	}
+
+	mul = readl(base + 0x30) >> 3 & 0x3f;
+	iounmap(base);
+
+	ref_clk = of_clk_get(node, 0);
+	if (IS_ERR(ref_clk)) {
+		pr_err("%pOF: of_clk_get failed\n", node);
+		return;
+	}
+
+	hw = clk_hw_register_fixed_factor(NULL, name, parent_name, 0, mul, 1);
+	if (IS_ERR(hw)) {
+		pr_err("%pOF: failed to register clock\n", node);
+		return;
+	}
+
+	clk_hw_register_clkdev(hw, NULL, name);
+	of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw);
+}
+CLK_OF_DECLARE(moxart_pll_clock, "moxa,moxart-pll-clock",
+	       moxart_of_pll_clk_init);
+
+static void __init moxart_of_apb_clk_init(struct device_node *node)
+{
+	void __iomem *base;
+	struct clk_hw *hw;
+	struct clk *pll_clk;
+	unsigned int div, val;
+	unsigned int div_idx[] = { 2, 3, 4, 6, 8};
+	const char *name = node->name;
+	const char *parent_name;
+
+	of_property_read_string(node, "clock-output-names", &name);
+	parent_name = of_clk_get_parent_name(node, 0);
+
+	base = of_iomap(node, 0);
+	if (!base) {
+		pr_err("%pOF: of_iomap failed\n", node);
+		return;
+	}
+
+	val = readl(base + 0xc) >> 4 & 0x7;
+	iounmap(base);
+
+	if (val > 4)
+		val = 0;
+	div = div_idx[val] * 2;
+
+	pll_clk = of_clk_get(node, 0);
+	if (IS_ERR(pll_clk)) {
+		pr_err("%pOF: of_clk_get failed\n", node);
+		return;
+	}
+
+	hw = clk_hw_register_fixed_factor(NULL, name, parent_name, 0, 1, div);
+	if (IS_ERR(hw)) {
+		pr_err("%pOF: failed to register clock\n", node);
+		return;
+	}
+
+	clk_hw_register_clkdev(hw, NULL, name);
+	of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw);
+}
+CLK_OF_DECLARE(moxart_apb_clock, "moxa,moxart-apb-clock",
+	       moxart_of_apb_clk_init);