1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2016 Maxime Ripard
4 * Maxime Ripard <maxime.ripard@free-electrons.com>
5 */
6
7 #include <linux/clk-provider.h>
8 #include <linux/io.h>
9
10 #include "ccu_gate.h"
11
ccu_gate_helper_disable(struct ccu_common * common,u32 gate)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 EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_disable, SUNXI_CCU);
28
ccu_gate_disable(struct clk_hw * hw)29 static void ccu_gate_disable(struct clk_hw *hw)
30 {
31 struct ccu_gate *cg = hw_to_ccu_gate(hw);
32
33 return ccu_gate_helper_disable(&cg->common, cg->enable);
34 }
35
ccu_gate_helper_enable(struct ccu_common * common,u32 gate)36 int ccu_gate_helper_enable(struct ccu_common *common, u32 gate)
37 {
38 unsigned long flags;
39 u32 reg;
40
41 if (!gate)
42 return 0;
43
44 spin_lock_irqsave(common->lock, flags);
45
46 reg = readl(common->base + common->reg);
47 writel(reg | gate, common->base + common->reg);
48
49 spin_unlock_irqrestore(common->lock, flags);
50
51 return 0;
52 }
53 EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_enable, SUNXI_CCU);
54
ccu_gate_enable(struct clk_hw * hw)55 static int ccu_gate_enable(struct clk_hw *hw)
56 {
57 struct ccu_gate *cg = hw_to_ccu_gate(hw);
58
59 return ccu_gate_helper_enable(&cg->common, cg->enable);
60 }
61
ccu_gate_helper_is_enabled(struct ccu_common * common,u32 gate)62 int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate)
63 {
64 if (!gate)
65 return 1;
66
67 return readl(common->base + common->reg) & gate;
68 }
69 EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_is_enabled, SUNXI_CCU);
70
ccu_gate_is_enabled(struct clk_hw * hw)71 static int ccu_gate_is_enabled(struct clk_hw *hw)
72 {
73 struct ccu_gate *cg = hw_to_ccu_gate(hw);
74
75 return ccu_gate_helper_is_enabled(&cg->common, cg->enable);
76 }
77
ccu_gate_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)78 static unsigned long ccu_gate_recalc_rate(struct clk_hw *hw,
79 unsigned long parent_rate)
80 {
81 struct ccu_gate *cg = hw_to_ccu_gate(hw);
82 unsigned long rate = parent_rate;
83
84 if (cg->common.features & CCU_FEATURE_ALL_PREDIV)
85 rate /= cg->common.prediv;
86
87 return rate;
88 }
89
ccu_gate_round_rate(struct clk_hw * hw,unsigned long rate,unsigned long * prate)90 static long ccu_gate_round_rate(struct clk_hw *hw, unsigned long rate,
91 unsigned long *prate)
92 {
93 struct ccu_gate *cg = hw_to_ccu_gate(hw);
94 int div = 1;
95
96 if (cg->common.features & CCU_FEATURE_ALL_PREDIV)
97 div = cg->common.prediv;
98
99 if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
100 unsigned long best_parent = rate;
101
102 if (cg->common.features & CCU_FEATURE_ALL_PREDIV)
103 best_parent *= div;
104 *prate = clk_hw_round_rate(clk_hw_get_parent(hw), best_parent);
105 }
106
107 return *prate / div;
108 }
109
ccu_gate_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)110 static int ccu_gate_set_rate(struct clk_hw *hw, unsigned long rate,
111 unsigned long parent_rate)
112 {
113 /*
114 * We must report success but we can do so unconditionally because
115 * clk_factor_round_rate returns values that ensure this call is a
116 * nop.
117 */
118
119 return 0;
120 }
121
122 const struct clk_ops ccu_gate_ops = {
123 .disable = ccu_gate_disable,
124 .enable = ccu_gate_enable,
125 .is_enabled = ccu_gate_is_enabled,
126 .round_rate = ccu_gate_round_rate,
127 .set_rate = ccu_gate_set_rate,
128 .recalc_rate = ccu_gate_recalc_rate,
129 };
130 EXPORT_SYMBOL_NS_GPL(ccu_gate_ops, SUNXI_CCU);
131