1 files changed, 143 insertions, 0 deletions
diff --git a/drivers/clk/zynqmp/clk-gate-zynqmp.c b/drivers/clk/zynqmp/clk-gate-zynqmp.c
new file mode 100644
index 0000000000..b89e557371
--- /dev/null
+++ b/drivers/clk/zynqmp/clk-gate-zynqmp.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Zynq UltraScale+ MPSoC clock controller
+ *
+ *  Copyright (C) 2016-2018 Xilinx
+ *
+ * Gated clock implementation
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/slab.h>
+#include "clk-zynqmp.h"
+
+/**
+ * struct zynqmp_clk_gate - gating clock
+ * @hw:		handle between common and hardware-specific interfaces
+ * @flags:	hardware-specific flags
+ * @clk_id:	Id of clock
+ */
+struct zynqmp_clk_gate {
+	struct clk_hw hw;
+	u8 flags;
+	u32 clk_id;
+};
+
+#define to_zynqmp_clk_gate(_hw) container_of(_hw, struct zynqmp_clk_gate, hw)
+
+/**
+ * zynqmp_clk_gate_enable() - Enable clock
+ * @hw:		handle between common and hardware-specific interfaces
+ *
+ * Return: 0 on success else error code
+ */
+static int zynqmp_clk_gate_enable(struct clk_hw *hw)
+{
+	struct zynqmp_clk_gate *gate = to_zynqmp_clk_gate(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = gate->clk_id;
+	int ret;
+
+	ret = zynqmp_pm_clock_enable(clk_id);
+
+	if (ret)
+		pr_debug("%s() clock enable failed for %s (id %d), ret = %d\n",
+			 __func__, clk_name, clk_id, ret);
+
+	return ret;
+}
+
+/*
+ * zynqmp_clk_gate_disable() - Disable clock
+ * @hw:		handle between common and hardware-specific interfaces
+ */
+static void zynqmp_clk_gate_disable(struct clk_hw *hw)
+{
+	struct zynqmp_clk_gate *gate = to_zynqmp_clk_gate(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = gate->clk_id;
+	int ret;
+
+	ret = zynqmp_pm_clock_disable(clk_id);
+
+	if (ret)
+		pr_debug("%s() clock disable failed for %s (id %d), ret = %d\n",
+			 __func__, clk_name, clk_id, ret);
+}
+
+/**
+ * zynqmp_clk_gate_is_enabled() - Check clock state
+ * @hw:		handle between common and hardware-specific interfaces
+ *
+ * Return: 1 if enabled, 0 if disabled else error code
+ */
+static int zynqmp_clk_gate_is_enabled(struct clk_hw *hw)
+{
+	struct zynqmp_clk_gate *gate = to_zynqmp_clk_gate(hw);
+	const char *clk_name = clk_hw_get_name(hw);
+	u32 clk_id = gate->clk_id;
+	int state, ret;
+
+	ret = zynqmp_pm_clock_getstate(clk_id, &state);
+	if (ret) {
+		pr_debug("%s() clock get state failed for %s, ret = %d\n",
+			 __func__, clk_name, ret);
+		return -EIO;
+	}
+
+	return state ? 1 : 0;
+}
+
+static const struct clk_ops zynqmp_clk_gate_ops = {
+	.enable = zynqmp_clk_gate_enable,
+	.disable = zynqmp_clk_gate_disable,
+	.is_enabled = zynqmp_clk_gate_is_enabled,
+};
+
+/**
+ * zynqmp_clk_register_gate() - Register a gate clock with the clock framework
+ * @name:		Name of this clock
+ * @clk_id:		Id of this clock
+ * @parents:		Name of this clock's parents
+ * @num_parents:	Number of parents
+ * @nodes:		Clock topology node
+ *
+ * Return: clock hardware of the registered clock gate
+ */
+struct clk_hw *zynqmp_clk_register_gate(const char *name, u32 clk_id,
+					const char * const *parents,
+					u8 num_parents,
+					const struct clock_topology *nodes)
+{
+	struct zynqmp_clk_gate *gate;
+	struct clk_hw *hw;
+	int ret;
+	struct clk_init_data init;
+
+	/* allocate the gate */
+	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
+	if (!gate)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &zynqmp_clk_gate_ops;
+
+	init.flags = zynqmp_clk_map_common_ccf_flags(nodes->flag);
+
+	init.parent_names = parents;
+	init.num_parents = 1;
+
+	/* struct clk_gate assignments */
+	gate->flags = nodes->type_flag;
+	gate->hw.init = &init;
+	gate->clk_id = clk_id;
+
+	hw = &gate->hw;
+	ret = clk_hw_register(NULL, hw);
+	if (ret) {
+		kfree(gate);
+		hw = ERR_PTR(ret);
+	}
+
+	return hw;
+}