1 // SPDX-License-Identifier: GPL-2.0
3 // Spreadtrum gate clock driver
5 // Copyright (C) 2017 Spreadtrum, Inc.
6 // Author: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
8 #include <linux/clk-provider.h>
9 #include <linux/regmap.h>
13 static void clk_gate_toggle(const struct sprd_gate *sg, bool en)
15 const struct sprd_clk_common *common = &sg->common;
17 bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? true : false;
21 regmap_read(common->regmap, common->reg, ®);
24 reg |= sg->enable_mask;
26 reg &= ~sg->enable_mask;
28 regmap_write(common->regmap, common->reg, reg);
31 static void clk_sc_gate_toggle(const struct sprd_gate *sg, bool en)
33 const struct sprd_clk_common *common = &sg->common;
34 bool set = sg->flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0;
40 * Each set/clear gate clock has three registers:
41 * common->reg - base register
42 * common->reg + offset - set register
43 * common->reg + 2 * offset - clear register
45 offset = set ? sg->sc_offset : sg->sc_offset * 2;
47 regmap_write(common->regmap, common->reg + offset,
51 static void sprd_gate_disable(struct clk_hw *hw)
53 struct sprd_gate *sg = hw_to_sprd_gate(hw);
55 clk_gate_toggle(sg, false);
58 static int sprd_gate_enable(struct clk_hw *hw)
60 struct sprd_gate *sg = hw_to_sprd_gate(hw);
62 clk_gate_toggle(sg, true);
67 static void sprd_sc_gate_disable(struct clk_hw *hw)
69 struct sprd_gate *sg = hw_to_sprd_gate(hw);
71 clk_sc_gate_toggle(sg, false);
74 static int sprd_sc_gate_enable(struct clk_hw *hw)
76 struct sprd_gate *sg = hw_to_sprd_gate(hw);
78 clk_sc_gate_toggle(sg, true);
82 static int sprd_gate_is_enabled(struct clk_hw *hw)
84 struct sprd_gate *sg = hw_to_sprd_gate(hw);
85 struct sprd_clk_common *common = &sg->common;
88 regmap_read(common->regmap, common->reg, ®);
90 if (sg->flags & CLK_GATE_SET_TO_DISABLE)
91 reg ^= sg->enable_mask;
93 reg &= sg->enable_mask;
98 const struct clk_ops sprd_gate_ops = {
99 .disable = sprd_gate_disable,
100 .enable = sprd_gate_enable,
101 .is_enabled = sprd_gate_is_enabled,
103 EXPORT_SYMBOL_GPL(sprd_gate_ops);
105 const struct clk_ops sprd_sc_gate_ops = {
106 .disable = sprd_sc_gate_disable,
107 .enable = sprd_sc_gate_enable,
108 .is_enabled = sprd_gate_is_enabled,
110 EXPORT_SYMBOL_GPL(sprd_sc_gate_ops);