1 files changed, 147 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-gate2.c b/drivers/clk/imx/clk-gate2.c
new file mode 100644
index 0000000000..f952f3e3f6
--- /dev/null
+++ b/drivers/clk/imx/clk-gate2.c
@@ -0,0 +1,147 @@
+/*
+ * clk-gate2.c - barebox 2-bit clock support. Based on Linux clk support
+ *
+ * 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>
+
+#include "clk.h"
+
+
+struct clk_gate2 {
+	struct clk clk;
+	void __iomem *reg;
+	int shift;
+	u8 cgr_val;
+	const char *parent;
+#define CLK_GATE_INVERTED	(1 << 0)
+	unsigned flags;
+};
+
+#define to_clk_gate2(_clk) container_of(_clk, struct clk_gate2, clk)
+
+static int clk_gate2_enable(struct clk *clk)
+{
+	struct clk_gate2 *g = to_clk_gate2(clk);
+	u32 val;
+
+	val = readl(g->reg);
+
+	if (g->flags & CLK_GATE_INVERTED)
+		val &= ~(3 << g->shift);
+	else
+		val |= g->cgr_val << g->shift;
+
+	writel(val, g->reg);
+
+	return 0;
+}
+
+static void clk_gate2_disable(struct clk *clk)
+{
+	struct clk_gate2 *g = to_clk_gate2(clk);
+	u32 val;
+
+	val = readl(g->reg);
+
+	if (g->flags & CLK_GATE_INVERTED)
+		val |= 3 << g->shift;
+	else
+		val &= ~(3 << g->shift);
+
+	writel(val, g->reg);
+}
+
+static int clk_gate2_is_enabled(struct clk *clk)
+{
+	struct clk_gate2 *g = to_clk_gate2(clk);
+	u32 val;
+
+	val = readl(g->reg);
+
+	if (val & (1 << g->shift))
+		return g->flags & CLK_GATE_INVERTED ? 0 : 1;
+	else
+		return g->flags & CLK_GATE_INVERTED ? 1 : 0;
+}
+
+static struct clk_ops clk_gate2_ops = {
+	.set_rate = clk_parent_set_rate,
+	.round_rate = clk_parent_round_rate,
+	.enable = clk_gate2_enable,
+	.disable = clk_gate2_disable,
+	.is_enabled = clk_gate2_is_enabled,
+};
+
+struct clk *clk_gate2_alloc(const char *name, const char *parent,
+			    void __iomem *reg, u8 shift, u8 cgr_val)
+{
+	struct clk_gate2 *g = xzalloc(sizeof(*g));
+
+	g->parent = parent;
+	g->reg = reg;
+	g->cgr_val = cgr_val;
+	g->shift = shift;
+	g->clk.ops = &clk_gate2_ops;
+	g->clk.name = name;
+	g->clk.parent_names = &g->parent;
+	g->clk.num_parents = 1;
+	g->clk.flags = CLK_SET_RATE_PARENT;
+
+	return &g->clk;
+}
+
+void clk_gate2_free(struct clk *clk)
+{
+	struct clk_gate2 *g = to_clk_gate2(clk);
+
+	free(g);
+}
+
+struct clk *clk_gate2(const char *name, const char *parent, void __iomem *reg,
+		      u8 shift, u8 cgr_val)
+{
+	struct clk *g;
+	int ret;
+
+	g = clk_gate2_alloc(name , parent, reg, shift, cgr_val);
+
+	ret = clk_register(g);
+	if (ret) {
+		free(to_clk_gate2(g));
+		return ERR_PTR(ret);
+	}
+
+	return g;
+}
+
+struct clk *clk_gate2_inverted(const char *name, const char *parent,
+		void __iomem *reg, u8 shift)
+{
+	struct clk *clk;
+	struct clk_gate2 *g;
+
+	clk = clk_gate2(name, parent, reg, shift, 0x3);
+	if (IS_ERR(clk))
+		return clk;
+
+	g = to_clk_gate2(clk);
+
+	g->flags = CLK_GATE_INVERTED;
+
+	return clk;
+}