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authorChunyan Zhang <chunyan.zhang@spreadtrum.com>2017-12-07 20:57:06 +0800
committerStephen Boyd <sboyd@codeaurora.org>2017-12-21 15:00:51 -0800
commitcdb09f67a2b58f0e0a2764243cf2c912c158f0a6 (patch)
tree2d99315e7b4547a04890c55b00aded1f064fa284 /drivers/clk/sprd
parentd41f59fd92f2ef73026f55cd356a4ca253f4716a (diff)
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clk: sprd: add gate clock support
Some clocks on the Spreadtrum's SoCs are just simple gates. Add support for those clocks. Signed-off-by: Chunyan Zhang <chunyan.zhang@spreadtrum.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Diffstat (limited to 'drivers/clk/sprd')
-rw-r--r--drivers/clk/sprd/Makefile1
-rw-r--r--drivers/clk/sprd/gate.c111
-rw-r--r--drivers/clk/sprd/gate.h59
3 files changed, 171 insertions, 0 deletions
diff --git a/drivers/clk/sprd/Makefile b/drivers/clk/sprd/Makefile
index 74f4b808fe48..8cd5592af89b 100644
--- a/drivers/clk/sprd/Makefile
+++ b/drivers/clk/sprd/Makefile
@@ -1,3 +1,4 @@
obj-$(CONFIG_SPRD_COMMON_CLK) += clk-sprd.o
clk-sprd-y += common.o
+clk-sprd-y += gate.o
diff --git a/drivers/clk/sprd/gate.c b/drivers/clk/sprd/gate.c
new file mode 100644
index 000000000000..f59d1936b412
--- /dev/null
+++ b/drivers/clk/sprd/gate.c
@@ -0,0 +1,111 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Spreadtrum gate clock driver
+//
+// Copyright (C) 2017 Spreadtrum, Inc.
+// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
+
+#include <linux/clk-provider.h>
+#include <linux/regmap.h>
+
+#include "gate.h"
+
+static void clk_gate_toggle(const struct sprd_gate *sg, bool en)
+{
+ const struct sprd_clk_common *common = &sg->common;
+ unsigned int reg;
+ bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? true : false;
+
+ set ^= en;
+
+ regmap_read(common->regmap, common->reg, &reg);
+
+ if (set)
+ reg |= sg->enable_mask;
+ else
+ reg &= ~sg->enable_mask;
+
+ regmap_write(common->regmap, common->reg, reg);
+}
+
+static void clk_sc_gate_toggle(const struct sprd_gate *sg, bool en)
+{
+ const struct sprd_clk_common *common = &sg->common;
+ bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0;
+ unsigned int offset;
+
+ set ^= en;
+
+ /*
+ * Each set/clear gate clock has three registers:
+ * common->reg - base register
+ * common->reg + offset - set register
+ * common->reg + 2 * offset - clear register
+ */
+ offset = set ? sg->sc_offset : sg->sc_offset * 2;
+
+ regmap_write(common->regmap, common->reg + offset,
+ sg->enable_mask);
+}
+
+static void sprd_gate_disable(struct clk_hw *hw)
+{
+ struct sprd_gate *sg = hw_to_sprd_gate(hw);
+
+ clk_gate_toggle(sg, false);
+}
+
+static int sprd_gate_enable(struct clk_hw *hw)
+{
+ struct sprd_gate *sg = hw_to_sprd_gate(hw);
+
+ clk_gate_toggle(sg, true);
+
+ return 0;
+}
+
+static void sprd_sc_gate_disable(struct clk_hw *hw)
+{
+ struct sprd_gate *sg = hw_to_sprd_gate(hw);
+
+ clk_sc_gate_toggle(sg, false);
+}
+
+static int sprd_sc_gate_enable(struct clk_hw *hw)
+{
+ struct sprd_gate *sg = hw_to_sprd_gate(hw);
+
+ clk_sc_gate_toggle(sg, true);
+
+ return 0;
+}
+static int sprd_gate_is_enabled(struct clk_hw *hw)
+{
+ struct sprd_gate *sg = hw_to_sprd_gate(hw);
+ struct sprd_clk_common *common = &sg->common;
+ unsigned int reg;
+
+ regmap_read(common->regmap, common->reg, &reg);
+
+ if (sg->flags & CLK_GATE_SET_TO_DISABLE)
+ reg ^= sg->enable_mask;
+
+ reg &= sg->enable_mask;
+
+ return reg ? 1 : 0;
+}
+
+const struct clk_ops sprd_gate_ops = {
+ .disable = sprd_gate_disable,
+ .enable = sprd_gate_enable,
+ .is_enabled = sprd_gate_is_enabled,
+};
+EXPORT_SYMBOL_GPL(sprd_gate_ops);
+
+const struct clk_ops sprd_sc_gate_ops = {
+ .disable = sprd_sc_gate_disable,
+ .enable = sprd_sc_gate_enable,
+ .is_enabled = sprd_gate_is_enabled,
+};
+EXPORT_SYMBOL_GPL(sprd_sc_gate_ops);
+
diff --git a/drivers/clk/sprd/gate.h b/drivers/clk/sprd/gate.h
new file mode 100644
index 000000000000..2e582c68a08b
--- /dev/null
+++ b/drivers/clk/sprd/gate.h
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Spreadtrum gate clock driver
+//
+// Copyright (C) 2017 Spreadtrum, Inc.
+// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
+
+#ifndef _SPRD_GATE_H_
+#define _SPRD_GATE_H_
+
+#include "common.h"
+
+struct sprd_gate {
+ u32 enable_mask;
+ u16 flags;
+ u16 sc_offset;
+
+ struct sprd_clk_common common;
+};
+
+#define SPRD_SC_GATE_CLK_OPS(_struct, _name, _parent, _reg, _sc_offset, \
+ _enable_mask, _flags, _gate_flags, _ops) \
+ struct sprd_gate _struct = { \
+ .enable_mask = _enable_mask, \
+ .sc_offset = _sc_offset, \
+ .flags = _gate_flags, \
+ .common = { \
+ .regmap = NULL, \
+ .reg = _reg, \
+ .hw.init = CLK_HW_INIT(_name, \
+ _parent, \
+ _ops, \
+ _flags), \
+ } \
+ }
+
+#define SPRD_GATE_CLK(_struct, _name, _parent, _reg, \
+ _enable_mask, _flags, _gate_flags) \
+ SPRD_SC_GATE_CLK_OPS(_struct, _name, _parent, _reg, 0, \
+ _enable_mask, _flags, _gate_flags, \
+ &sprd_gate_ops)
+
+#define SPRD_SC_GATE_CLK(_struct, _name, _parent, _reg, _sc_offset, \
+ _enable_mask, _flags, _gate_flags) \
+ SPRD_SC_GATE_CLK_OPS(_struct, _name, _parent, _reg, _sc_offset, \
+ _enable_mask, _flags, _gate_flags, \
+ &sprd_sc_gate_ops)
+
+static inline struct sprd_gate *hw_to_sprd_gate(const struct clk_hw *hw)
+{
+ struct sprd_clk_common *common = hw_to_sprd_clk_common(hw);
+
+ return container_of(common, struct sprd_gate, common);
+}
+
+extern const struct clk_ops sprd_gate_ops;
+extern const struct clk_ops sprd_sc_gate_ops;
+
+#endif /* _SPRD_GATE_H_ */