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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>
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3 changed files with 171 additions and 0 deletions
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obj-$(CONFIG_SPRD_COMMON_CLK) += clk-sprd.o
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obj-$(CONFIG_SPRD_COMMON_CLK) += clk-sprd.o
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clk-sprd-y += common.o
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clk-sprd-y += common.o
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clk-sprd-y += gate.o
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111
drivers/clk/sprd/gate.c
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111
drivers/clk/sprd/gate.c
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// SPDX-License-Identifier: GPL-2.0
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//
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// Spreadtrum gate clock driver
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//
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// Copyright (C) 2017 Spreadtrum, Inc.
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// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
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#include <linux/clk-provider.h>
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#include <linux/regmap.h>
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#include "gate.h"
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static void clk_gate_toggle(const struct sprd_gate *sg, bool en)
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{
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const struct sprd_clk_common *common = &sg->common;
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unsigned int reg;
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bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? true : false;
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set ^= en;
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regmap_read(common->regmap, common->reg, ®);
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if (set)
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reg |= sg->enable_mask;
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else
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reg &= ~sg->enable_mask;
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regmap_write(common->regmap, common->reg, reg);
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}
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static void clk_sc_gate_toggle(const struct sprd_gate *sg, bool en)
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{
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const struct sprd_clk_common *common = &sg->common;
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bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0;
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unsigned int offset;
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set ^= en;
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/*
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* Each set/clear gate clock has three registers:
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* common->reg - base register
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* common->reg + offset - set register
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* common->reg + 2 * offset - clear register
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*/
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offset = set ? sg->sc_offset : sg->sc_offset * 2;
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regmap_write(common->regmap, common->reg + offset,
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sg->enable_mask);
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}
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static void sprd_gate_disable(struct clk_hw *hw)
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{
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struct sprd_gate *sg = hw_to_sprd_gate(hw);
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clk_gate_toggle(sg, false);
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}
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static int sprd_gate_enable(struct clk_hw *hw)
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{
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struct sprd_gate *sg = hw_to_sprd_gate(hw);
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clk_gate_toggle(sg, true);
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return 0;
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}
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static void sprd_sc_gate_disable(struct clk_hw *hw)
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{
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struct sprd_gate *sg = hw_to_sprd_gate(hw);
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clk_sc_gate_toggle(sg, false);
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}
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static int sprd_sc_gate_enable(struct clk_hw *hw)
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{
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struct sprd_gate *sg = hw_to_sprd_gate(hw);
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clk_sc_gate_toggle(sg, true);
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return 0;
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}
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static int sprd_gate_is_enabled(struct clk_hw *hw)
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{
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struct sprd_gate *sg = hw_to_sprd_gate(hw);
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struct sprd_clk_common *common = &sg->common;
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unsigned int reg;
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regmap_read(common->regmap, common->reg, ®);
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if (sg->flags & CLK_GATE_SET_TO_DISABLE)
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reg ^= sg->enable_mask;
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reg &= sg->enable_mask;
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return reg ? 1 : 0;
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}
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const struct clk_ops sprd_gate_ops = {
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.disable = sprd_gate_disable,
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.enable = sprd_gate_enable,
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.is_enabled = sprd_gate_is_enabled,
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};
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EXPORT_SYMBOL_GPL(sprd_gate_ops);
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const struct clk_ops sprd_sc_gate_ops = {
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.disable = sprd_sc_gate_disable,
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.enable = sprd_sc_gate_enable,
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.is_enabled = sprd_gate_is_enabled,
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};
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EXPORT_SYMBOL_GPL(sprd_sc_gate_ops);
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59
drivers/clk/sprd/gate.h
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59
drivers/clk/sprd/gate.h
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// SPDX-License-Identifier: GPL-2.0
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//
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// Spreadtrum gate clock driver
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//
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// Copyright (C) 2017 Spreadtrum, Inc.
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// Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
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#ifndef _SPRD_GATE_H_
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#define _SPRD_GATE_H_
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#include "common.h"
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struct sprd_gate {
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u32 enable_mask;
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u16 flags;
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u16 sc_offset;
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struct sprd_clk_common common;
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};
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#define SPRD_SC_GATE_CLK_OPS(_struct, _name, _parent, _reg, _sc_offset, \
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_enable_mask, _flags, _gate_flags, _ops) \
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struct sprd_gate _struct = { \
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.enable_mask = _enable_mask, \
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.sc_offset = _sc_offset, \
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.flags = _gate_flags, \
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.common = { \
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.regmap = NULL, \
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.reg = _reg, \
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.hw.init = CLK_HW_INIT(_name, \
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_parent, \
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_ops, \
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_flags), \
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} \
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}
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#define SPRD_GATE_CLK(_struct, _name, _parent, _reg, \
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_enable_mask, _flags, _gate_flags) \
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SPRD_SC_GATE_CLK_OPS(_struct, _name, _parent, _reg, 0, \
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_enable_mask, _flags, _gate_flags, \
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&sprd_gate_ops)
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#define SPRD_SC_GATE_CLK(_struct, _name, _parent, _reg, _sc_offset, \
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_enable_mask, _flags, _gate_flags) \
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SPRD_SC_GATE_CLK_OPS(_struct, _name, _parent, _reg, _sc_offset, \
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_enable_mask, _flags, _gate_flags, \
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&sprd_sc_gate_ops)
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static inline struct sprd_gate *hw_to_sprd_gate(const struct clk_hw *hw)
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{
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struct sprd_clk_common *common = hw_to_sprd_clk_common(hw);
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return container_of(common, struct sprd_gate, common);
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}
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extern const struct clk_ops sprd_gate_ops;
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extern const struct clk_ops sprd_sc_gate_ops;
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#endif /* _SPRD_GATE_H_ */
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