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Subject[PATCH v6 04/11] clk: actions: Add gate clock support
Date
Add support for Actions Semi gate clock together with helper
functions to be used in composite clock.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
---
drivers/clk/actions/Makefile | 1 +
drivers/clk/actions/owl-gate.c | 77 ++++++++++++++++++++++++++++++++++++++++++
drivers/clk/actions/owl-gate.h | 73 +++++++++++++++++++++++++++++++++++++++
3 files changed, 151 insertions(+)
create mode 100644 drivers/clk/actions/owl-gate.c
create mode 100644 drivers/clk/actions/owl-gate.h

diff --git a/drivers/clk/actions/Makefile b/drivers/clk/actions/Makefile
index 64a50fc2d335..1f0917872c9d 100644
--- a/drivers/clk/actions/Makefile
+++ b/drivers/clk/actions/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_CLK_ACTIONS) += clk-owl.o

clk-owl-y += owl-common.o
+clk-owl-y += owl-gate.o
diff --git a/drivers/clk/actions/owl-gate.c b/drivers/clk/actions/owl-gate.c
new file mode 100644
index 000000000000..b87b76e17472
--- /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_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_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,
+};
diff --git a/drivers/clk/actions/owl-gate.h b/drivers/clk/actions/owl-gate.h
new file mode 100644
index 000000000000..f37b33a1be6b
--- /dev/null
+++ b/drivers/clk/actions/owl-gate.h
@@ -0,0 +1,73 @@
+// 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>
+
+#ifndef _OWL_GATE_H_
+#define _OWL_GATE_H_
+
+#include "owl-common.h"
+
+struct owl_gate_hw {
+ u32 reg;
+ u8 bit_idx;
+ u8 gate_flags;
+};
+
+struct owl_gate {
+ struct owl_gate_hw gate_hw;
+ struct owl_clk_common common;
+};
+
+#define OWL_GATE_HW(_reg, _bit_idx, _gate_flags) \
+ { \
+ .reg = _reg, \
+ .bit_idx = _bit_idx, \
+ .gate_flags = _gate_flags, \
+ }
+
+#define OWL_GATE(_struct, _name, _parent, _reg, \
+ _bit_idx, _gate_flags, _flags) \
+ struct owl_gate _struct = { \
+ .gate_hw = OWL_GATE_HW(_reg, _bit_idx, _gate_flags), \
+ .common = { \
+ .regmap = NULL, \
+ .hw.init = CLK_HW_INIT(_name, \
+ _parent, \
+ &owl_gate_ops, \
+ _flags), \
+ } \
+ } \
+
+#define OWL_GATE_NO_PARENT(_struct, _name, _reg, \
+ _bit_idx, _gate_flags, _flags) \
+ struct owl_gate _struct = { \
+ .gate_hw = OWL_GATE_HW(_reg, _bit_idx, _gate_flags), \
+ .common = { \
+ .regmap = NULL, \
+ .hw.init = CLK_HW_INIT_NO_PARENT(_name, \
+ &owl_gate_ops, \
+ _flags), \
+ }, \
+ } \
+
+static inline struct owl_gate *hw_to_owl_gate(const struct clk_hw *hw)
+{
+ struct owl_clk_common *common = hw_to_owl_clk_common(hw);
+
+ return container_of(common, struct owl_gate, common);
+}
+
+void owl_gate_set(const struct owl_clk_common *common,
+ const struct owl_gate_hw *gate_hw, bool enable);
+int owl_gate_is_enabled(const struct owl_clk_common *common,
+ const struct owl_gate_hw *gate_hw);
+
+extern const struct clk_ops owl_gate_ops;
+
+#endif /* _OWL_GATE_H_ */
--
2.14.1
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