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}
27
28static 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
35int 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
53static 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
60int 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
68static 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
75static 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
87static 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
107static 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
119const struct clk_ops ccu_gate_ops = {
120	.disable	= ccu_gate_disable,
121	.enable		= ccu_gate_enable,
122	.is_enabled	= ccu_gate_is_enabled,
123	.round_rate	= ccu_gate_round_rate,
124	.set_rate	= ccu_gate_set_rate,
125	.recalc_rate	= ccu_gate_recalc_rate,
126};
127