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(common->base + common->reg);
23	writel(reg & ~gate, common->base + common->reg);
24
25	spin_unlock_irqrestore(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(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}
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(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(clk_hw_get_parent(hw), 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