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
12void 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(addr: common->base + common->reg);
23 writel(val: reg & ~gate, addr: common->base + common->reg);
24
25 spin_unlock_irqrestore(lock: common->lock, flags);
26}
27EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_disable, SUNXI_CCU);
28
29static 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
36int 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(addr: common->base + common->reg);
47 writel(val: reg | gate, addr: common->base + common->reg);
48
49 spin_unlock_irqrestore(lock: common->lock, flags);
50
51 return 0;
52}
53EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_enable, SUNXI_CCU);
54
55static 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
62int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate)
63{
64 if (!gate)
65 return 1;
66
67 return readl(addr: common->base + common->reg) & gate;
68}
69EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_is_enabled, SUNXI_CCU);
70
71static 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
78static 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
90static 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(hw: clk_hw_get_parent(hw), rate: best_parent);
105 }
106
107 return *prate / div;
108}
109
110static 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
122const 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};
130EXPORT_SYMBOL_NS_GPL(ccu_gate_ops, SUNXI_CCU);
131

source code of linux/drivers/clk/sunxi-ng/ccu_gate.c