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Diffstat (limited to 'drivers/clk/actions/owl-gate.c')
-rw-r--r--drivers/clk/actions/owl-gate.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/clk/actions/owl-gate.c b/drivers/clk/actions/owl-gate.c
new file mode 100644
index 000000000000..f11500ba46a7
--- /dev/null
+++ b/drivers/clk/actions/owl-gate.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// OWL gate clock driver
+//
+// Copyright (c) 2014 Actions Semi Inc.
+// Author: David Liu <liuwei@actions-semi.com>
+//
+// Copyright (c) 2018 Linaro Ltd.
+// Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
+
+#include <linux/clk-provider.h>
+#include <linux/regmap.h>
+
+#include "owl-gate.h"
+
+void owl_gate_set(const struct owl_clk_common *common,
+ const struct owl_gate_hw *gate_hw, bool enable)
+{
+ int set = gate_hw->gate_flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0;
+ u32 reg;
+
+ set ^= enable;
+
+ regmap_read(common->regmap, gate_hw->reg, &reg);
+
+ if (set)
+ reg |= BIT(gate_hw->bit_idx);
+ else
+ reg &= ~BIT(gate_hw->bit_idx);
+
+ regmap_write(common->regmap, gate_hw->reg, reg);
+}
+
+static void owl_gate_disable(struct clk_hw *hw)
+{
+ struct owl_gate *gate = hw_to_owl_gate(hw);
+ struct owl_clk_common *common = &gate->common;
+
+ owl_gate_set(common, &gate->gate_hw, false);
+}
+
+static int owl_gate_enable(struct clk_hw *hw)
+{
+ struct owl_gate *gate = hw_to_owl_gate(hw);
+ struct owl_clk_common *common = &gate->common;
+
+ owl_gate_set(common, &gate->gate_hw, true);
+
+ return 0;
+}
+
+int owl_gate_clk_is_enabled(const struct owl_clk_common *common,
+ const struct owl_gate_hw *gate_hw)
+{
+ u32 reg;
+
+ regmap_read(common->regmap, gate_hw->reg, &reg);
+
+ if (gate_hw->gate_flags & CLK_GATE_SET_TO_DISABLE)
+ reg ^= BIT(gate_hw->bit_idx);
+
+ return !!(reg & BIT(gate_hw->bit_idx));
+}
+
+static int owl_gate_is_enabled(struct clk_hw *hw)
+{
+ struct owl_gate *gate = hw_to_owl_gate(hw);
+ struct owl_clk_common *common = &gate->common;
+
+ return owl_gate_clk_is_enabled(common, &gate->gate_hw);
+}
+
+const struct clk_ops owl_gate_ops = {
+ .disable = owl_gate_disable,
+ .enable = owl_gate_enable,
+ .is_enabled = owl_gate_is_enabled,
+};