summaryrefslogtreecommitdiff
path: root/drivers/clk/sunxi-ng/ccu_mult.c
blob: 7c8cf2e04e9450cefe0980355a23bdf4b6933f1a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2016 Maxime Ripard
 * Maxime Ripard <maxime.ripard@free-electrons.com>
 */

#include <linux/clk-provider.h>
#include <linux/io.h>

#include "ccu_gate.h"
#include "ccu_mult.h"

struct _ccu_mult {
	unsigned long	mult, min, max;
};

static void ccu_mult_find_best(unsigned long parent, unsigned long rate,
			       struct _ccu_mult *mult)
{
	int _mult;

	_mult = rate / parent;
	if (_mult < mult->min)
		_mult = mult->min;

	if (_mult > mult->max)
		_mult = mult->max;

	mult->mult = _mult;
}

static unsigned long ccu_mult_round_rate(struct ccu_mux_internal *mux,
					 struct clk_hw *parent,
					 unsigned long *parent_rate,
					 unsigned long rate,
					 void *data)
{
	struct ccu_mult *cm = data;
	struct _ccu_mult _cm;

	_cm.min = cm->mult.min;

	if (cm->mult.max)
		_cm.max = cm->mult.max;
	else
		_cm.max = (1 << cm->mult.width) + cm->mult.offset - 1;

	ccu_mult_find_best(*parent_rate, rate, &_cm);

	return *parent_rate * _cm.mult;
}

static void ccu_mult_disable(struct clk_hw *hw)
{
	struct ccu_mult *cm = hw_to_ccu_mult(hw);

	return ccu_gate_helper_disable(&cm->common, cm->enable);
}

static int ccu_mult_enable(struct clk_hw *hw)
{
	struct ccu_mult *cm = hw_to_ccu_mult(hw);

	return ccu_gate_helper_enable(&cm->common, cm->enable);
}

static int ccu_mult_is_enabled(struct clk_hw *hw)
{
	struct ccu_mult *cm = hw_to_ccu_mult(hw);

	return ccu_gate_helper_is_enabled(&cm->common, cm->enable);
}

static unsigned long ccu_mult_recalc_rate(struct clk_hw *hw,
					unsigned long parent_rate)
{
	struct ccu_mult *cm = hw_to_ccu_mult(hw);
	unsigned long val;
	u32 reg;

	if (ccu_frac_helper_is_enabled(&cm->common, &cm->frac))
		return ccu_frac_helper_read_rate(&cm->common, &cm->frac);

	reg = readl(cm->common.base + cm->common.reg);
	val = reg >> cm->mult.shift;
	val &= (1 << cm->mult.width) - 1;

	parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1,
						  parent_rate);

	return parent_rate * (val + cm->mult.offset);
}

static int ccu_mult_determine_rate(struct clk_hw *hw,
				struct clk_rate_request *req)
{
	struct ccu_mult *cm = hw_to_ccu_mult(hw);

	return ccu_mux_helper_determine_rate(&cm->common, &cm->mux,
					     req, ccu_mult_round_rate, cm);
}

static int ccu_mult_set_rate(struct clk_hw *hw, unsigned long rate,
			   unsigned long parent_rate)
{
	struct ccu_mult *cm = hw_to_ccu_mult(hw);
	struct _ccu_mult _cm;
	unsigned long flags;
	u32 reg;

	if (ccu_frac_helper_has_rate(&cm->common, &cm->frac, rate)) {
		ccu_frac_helper_enable(&cm->common, &cm->frac);

		return ccu_frac_helper_set_rate(&cm->common, &cm->frac,
						rate, cm->lock);
	} else {
		ccu_frac_helper_disable(&cm->common, &cm->frac);
	}

	parent_rate = ccu_mux_helper_apply_prediv(&cm->common, &cm->mux, -1,
						  parent_rate);

	_cm.min = cm->mult.min;

	if (cm->mult.max)
		_cm.max = cm->mult.max;
	else
		_cm.max = (1 << cm->mult.width) + cm->mult.offset - 1;

	ccu_mult_find_best(parent_rate, rate, &_cm);

	spin_lock_irqsave(cm->common.lock, flags);

	reg = readl(cm->common.base + cm->common.reg);
	reg &= ~GENMASK(cm->mult.width + cm->mult.shift - 1, cm->mult.shift);
	reg |= ((_cm.mult - cm->mult.offset) << cm->mult.shift);

	writel(reg, cm->common.base + cm->common.reg);

	spin_unlock_irqrestore(cm->common.lock, flags);

	ccu_helper_wait_for_lock(&cm->common, cm->lock);

	return 0;
}

static u8 ccu_mult_get_parent(struct clk_hw *hw)
{
	struct ccu_mult *cm = hw_to_ccu_mult(hw);

	return ccu_mux_helper_get_parent(&cm->common, &cm->mux);
}

static int ccu_mult_set_parent(struct clk_hw *hw, u8 index)
{
	struct ccu_mult *cm = hw_to_ccu_mult(hw);

	return ccu_mux_helper_set_parent(&cm->common, &cm->mux, index);
}

const struct clk_ops ccu_mult_ops = {
	.disable	= ccu_mult_disable,
	.enable		= ccu_mult_enable,
	.is_enabled	= ccu_mult_is_enabled,

	.get_parent	= ccu_mult_get_parent,
	.set_parent	= ccu_mult_set_parent,

	.determine_rate	= ccu_mult_determine_rate,
	.recalc_rate	= ccu_mult_recalc_rate,
	.set_rate	= ccu_mult_set_rate,
};