GNU Linux-libre 4.19.211-gnu1
[releases.git] / drivers / clk / actions / owl-gate.c
1 // SPDX-License-Identifier: GPL-2.0+
2 //
3 // OWL gate clock driver
4 //
5 // Copyright (c) 2014 Actions Semi Inc.
6 // Author: David Liu <liuwei@actions-semi.com>
7 //
8 // Copyright (c) 2018 Linaro Ltd.
9 // Author: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
10
11 #include <linux/clk-provider.h>
12 #include <linux/regmap.h>
13
14 #include "owl-gate.h"
15
16 void owl_gate_set(const struct owl_clk_common *common,
17                  const struct owl_gate_hw *gate_hw, bool enable)
18 {
19         int set = gate_hw->gate_flags & CLK_GATE_SET_TO_DISABLE ? 1 : 0;
20         u32 reg;
21
22         set ^= enable;
23
24         regmap_read(common->regmap, gate_hw->reg, &reg);
25
26         if (set)
27                 reg |= BIT(gate_hw->bit_idx);
28         else
29                 reg &= ~BIT(gate_hw->bit_idx);
30
31         regmap_write(common->regmap, gate_hw->reg, reg);
32 }
33
34 static void owl_gate_disable(struct clk_hw *hw)
35 {
36         struct owl_gate *gate = hw_to_owl_gate(hw);
37         struct owl_clk_common *common = &gate->common;
38
39         owl_gate_set(common, &gate->gate_hw, false);
40 }
41
42 static int owl_gate_enable(struct clk_hw *hw)
43 {
44         struct owl_gate *gate = hw_to_owl_gate(hw);
45         struct owl_clk_common *common = &gate->common;
46
47         owl_gate_set(common, &gate->gate_hw, true);
48
49         return 0;
50 }
51
52 int owl_gate_clk_is_enabled(const struct owl_clk_common *common,
53                    const struct owl_gate_hw *gate_hw)
54 {
55         u32 reg;
56
57         regmap_read(common->regmap, gate_hw->reg, &reg);
58
59         if (gate_hw->gate_flags & CLK_GATE_SET_TO_DISABLE)
60                 reg ^= BIT(gate_hw->bit_idx);
61
62         return !!(reg & BIT(gate_hw->bit_idx));
63 }
64
65 static int owl_gate_is_enabled(struct clk_hw *hw)
66 {
67         struct owl_gate *gate = hw_to_owl_gate(hw);
68         struct owl_clk_common *common = &gate->common;
69
70         return owl_gate_clk_is_enabled(common, &gate->gate_hw);
71 }
72
73 const struct clk_ops owl_gate_ops = {
74         .disable        = owl_gate_disable,
75         .enable         = owl_gate_enable,
76         .is_enabled     = owl_gate_is_enabled,
77 };