1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
new file mode 100644
index 0000000000..cb5f1a1a7b
--- /dev/null
+++ b/drivers/clk/clk-mux.c
@@ -0,0 +1,77 @@
+/*
+ * clk-mux.c - generic barebox clock support. Based on Linux clk support
+ *
+ * Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+#include <common.h>
+#include <io.h>
+#include <malloc.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+struct clk_mux {
+	struct clk clk;
+	void __iomem *reg;
+	int shift;
+	int width;
+};
+
+static int clk_mux_get_parent(struct clk *clk)
+{
+	struct clk_mux *m = container_of(clk, struct clk_mux, clk);
+	int idx = readl(m->reg) >> m->shift & ((1 << m->width) - 1);
+
+	return idx;
+}
+
+static int clk_mux_set_parent(struct clk *clk, u8 idx)
+{
+	struct clk_mux *m = container_of(clk, struct clk_mux, clk);
+	u32 val;
+
+	val = readl(m->reg);
+	val &= ~(((1 << m->width) - 1) << m->shift);
+	val |= idx << m->shift;
+	writel(val, m->reg);
+
+	return 0;
+}
+
+struct clk_ops clk_mux_ops = {
+	.get_parent = clk_mux_get_parent,
+	.set_parent = clk_mux_set_parent,
+};
+
+struct clk *clk_mux(const char *name, void __iomem *reg,
+		u8 shift, u8 width, const char **parents, u8 num_parents)
+{
+	struct clk_mux *m = xzalloc(sizeof(*m));
+	int ret;
+
+	m->reg = reg;
+	m->shift = shift;
+	m->width = width;
+	m->clk.ops = &clk_mux_ops;
+	m->clk.name = name;
+	m->clk.parent_names = parents;
+	m->clk.num_parents = num_parents;
+
+	ret = clk_register(&m->clk);
+	if (ret) {
+		free(m);
+		return ERR_PTR(ret);
+	}
+
+	return &m->clk;
+}