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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1a7e7c38 MR |
2 | /* |
3 | * Copyright (C) 2016 Maxime Ripard | |
4 | * Maxime Ripard <maxime.ripard@free-electrons.com> | |
1a7e7c38 MR |
5 | */ |
6 | ||
7 | #include <linux/clk-provider.h> | |
62e59c4e | 8 | #include <linux/io.h> |
1a7e7c38 MR |
9 | |
10 | #include "ccu_gate.h" | |
11 | ||
12 | void ccu_gate_helper_disable(struct ccu_common *common, u32 gate) | |
13 | { | |
14 | unsigned long flags; | |
15 | u32 reg; | |
16 | ||
17 | if (!gate) | |
18 | return; | |
19 | ||
20 | spin_lock_irqsave(common->lock, flags); | |
21 | ||
22 | reg = readl(common->base + common->reg); | |
23 | writel(reg & ~gate, common->base + common->reg); | |
24 | ||
25 | spin_unlock_irqrestore(common->lock, flags); | |
26 | } | |
27 | ||
28 | static void ccu_gate_disable(struct clk_hw *hw) | |
29 | { | |
30 | struct ccu_gate *cg = hw_to_ccu_gate(hw); | |
31 | ||
32 | return ccu_gate_helper_disable(&cg->common, cg->enable); | |
33 | } | |
34 | ||
35 | int ccu_gate_helper_enable(struct ccu_common *common, u32 gate) | |
36 | { | |
37 | unsigned long flags; | |
38 | u32 reg; | |
39 | ||
40 | if (!gate) | |
41 | return 0; | |
42 | ||
43 | spin_lock_irqsave(common->lock, flags); | |
44 | ||
45 | reg = readl(common->base + common->reg); | |
46 | writel(reg | gate, common->base + common->reg); | |
47 | ||
48 | spin_unlock_irqrestore(common->lock, flags); | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | static int ccu_gate_enable(struct clk_hw *hw) | |
54 | { | |
55 | struct ccu_gate *cg = hw_to_ccu_gate(hw); | |
56 | ||
57 | return ccu_gate_helper_enable(&cg->common, cg->enable); | |
58 | } | |
59 | ||
60 | int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate) | |
61 | { | |
62 | if (!gate) | |
63 | return 1; | |
64 | ||
65 | return readl(common->base + common->reg) & gate; | |
66 | } | |
67 | ||
68 | static int ccu_gate_is_enabled(struct clk_hw *hw) | |
69 | { | |
70 | struct ccu_gate *cg = hw_to_ccu_gate(hw); | |
71 | ||
72 | return ccu_gate_helper_is_enabled(&cg->common, cg->enable); | |
73 | } | |
74 | ||
845d6b0f CYT |
75 | static unsigned long ccu_gate_recalc_rate(struct clk_hw *hw, |
76 | unsigned long parent_rate) | |
77 | { | |
78 | struct ccu_gate *cg = hw_to_ccu_gate(hw); | |
79 | unsigned long rate = parent_rate; | |
80 | ||
81 | if (cg->common.features & CCU_FEATURE_ALL_PREDIV) | |
82 | rate /= cg->common.prediv; | |
83 | ||
84 | return rate; | |
85 | } | |
86 | ||
87 | static long ccu_gate_round_rate(struct clk_hw *hw, unsigned long rate, | |
88 | unsigned long *prate) | |
89 | { | |
90 | struct ccu_gate *cg = hw_to_ccu_gate(hw); | |
91 | int div = 1; | |
92 | ||
93 | if (cg->common.features & CCU_FEATURE_ALL_PREDIV) | |
94 | div = cg->common.prediv; | |
95 | ||
96 | if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) { | |
97 | unsigned long best_parent = rate; | |
98 | ||
99 | if (cg->common.features & CCU_FEATURE_ALL_PREDIV) | |
100 | best_parent *= div; | |
101 | *prate = clk_hw_round_rate(clk_hw_get_parent(hw), best_parent); | |
102 | } | |
103 | ||
104 | return *prate / div; | |
105 | } | |
106 | ||
107 | static int ccu_gate_set_rate(struct clk_hw *hw, unsigned long rate, | |
108 | unsigned long parent_rate) | |
109 | { | |
110 | /* | |
111 | * We must report success but we can do so unconditionally because | |
112 | * clk_factor_round_rate returns values that ensure this call is a | |
113 | * nop. | |
114 | */ | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
1a7e7c38 MR |
119 | const struct clk_ops ccu_gate_ops = { |
120 | .disable = ccu_gate_disable, | |
121 | .enable = ccu_gate_enable, | |
122 | .is_enabled = ccu_gate_is_enabled, | |
845d6b0f CYT |
123 | .round_rate = ccu_gate_round_rate, |
124 | .set_rate = ccu_gate_set_rate, | |
125 | .recalc_rate = ccu_gate_recalc_rate, | |
1a7e7c38 | 126 | }; |