1 files changed, 103 insertions, 0 deletions
diff --git a/drivers/clk/imx/clk-gate-exclusive.c b/drivers/clk/imx/clk-gate-exclusive.c
new file mode 100644
index 0000000000..db88db0237
--- /dev/null
+++ b/drivers/clk/imx/clk-gate-exclusive.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2014 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <common.h>
+#include <io.h>
+#include <malloc.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+#include "clk.h"
+
+/**
+ * struct clk_gate_exclusive - i.MX specific gate clock which is mutually
+ * exclusive with other gate clocks
+ *
+ * @gate: the parent class
+ * @exclusive_mask: mask of gate bits which are mutually exclusive to this
+ *	gate clock
+ *
+ * The imx exclusive gate clock is a subclass of basic clk_gate
+ * with an addtional mask to indicate which other gate bits in the same
+ * register is mutually exclusive to this gate clock.
+ */
+struct clk_gate_exclusive {
+	struct clk clk;
+	void __iomem *reg;
+	int shift;
+	const char *parent;
+	u32 exclusive_mask;
+};
+
+static int clk_gate_exclusive_enable(struct clk *clk)
+{
+	struct clk_gate_exclusive *exgate = container_of(clk,
+					struct clk_gate_exclusive, clk);
+	u32 val = readl(exgate->reg);
+
+	if (val & exgate->exclusive_mask)
+		return -EBUSY;
+
+	val |= 1 << exgate->shift;
+
+	writel(val, exgate->reg);
+
+	return 0;
+}
+
+static void clk_gate_exclusive_disable(struct clk *clk)
+{
+	struct clk_gate_exclusive *exgate = container_of(clk,
+					struct clk_gate_exclusive, clk);
+	u32 val = readl(exgate->reg);
+
+	val &= ~(1 << exgate->shift);
+
+	writel(val, exgate->reg);
+}
+
+static int clk_gate_exclusive_is_enabled(struct clk *clk)
+{
+	struct clk_gate_exclusive *exgate = container_of(clk,
+					struct clk_gate_exclusive, clk);
+
+	return readl(exgate->reg) & (1 << exgate->shift);
+}
+
+static const struct clk_ops clk_gate_exclusive_ops = {
+	.enable = clk_gate_exclusive_enable,
+	.disable = clk_gate_exclusive_disable,
+	.is_enabled = clk_gate_exclusive_is_enabled,
+};
+
+struct clk *imx_clk_gate_exclusive(const char *name, const char *parent,
+	 void __iomem *reg, u8 shift, u32 exclusive_mask)
+{
+	struct clk_gate_exclusive *exgate;
+	int ret;
+
+	exgate = xzalloc(sizeof(*exgate));
+	exgate->parent = parent;
+	exgate->clk.name = name;
+	exgate->clk.ops = &clk_gate_exclusive_ops;
+	exgate->clk.flags = CLK_SET_RATE_PARENT;
+	exgate->clk.parent_names = &exgate->parent;
+	exgate->clk.num_parents = 1;
+
+	exgate->reg = reg;
+	exgate->shift = shift;
+	exgate->exclusive_mask = exclusive_mask;
+
+	ret = clk_register(&exgate->clk);
+	if (ret) {
+		free(exgate);
+		return ERR_PTR(ret);
+	}
+
+	return &exgate->clk;
+}