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
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Socionext Inc.
* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*/
#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/regmap.h>
#include "clk-uniphier.h"
struct uniphier_clk_mux {
struct clk_hw hw;
struct regmap *regmap;
unsigned int reg;
const unsigned int *masks;
const unsigned int *vals;
};
#define to_uniphier_clk_mux(_hw) container_of(_hw, struct uniphier_clk_mux, hw)
static int uniphier_clk_mux_set_parent(struct clk_hw *hw, u8 index)
{
struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw);
return regmap_write_bits(mux->regmap, mux->reg, mux->masks[index],
mux->vals[index]);
}
static u8 uniphier_clk_mux_get_parent(struct clk_hw *hw)
{
struct uniphier_clk_mux *mux = to_uniphier_clk_mux(hw);
int num_parents = clk_hw_get_num_parents(hw);
int ret;
unsigned int val;
u8 i;
ret = regmap_read(mux->regmap, mux->reg, &val);
if (ret)
return ret;
for (i = 0; i < num_parents; i++)
if ((mux->masks[i] & val) == mux->vals[i])
return i;
return -EINVAL;
}
static const struct clk_ops uniphier_clk_mux_ops = {
.determine_rate = __clk_mux_determine_rate,
.set_parent = uniphier_clk_mux_set_parent,
.get_parent = uniphier_clk_mux_get_parent,
};
struct clk_hw *uniphier_clk_register_mux(struct device *dev,
struct regmap *regmap,
const char *name,
const struct uniphier_clk_mux_data *data)
{
struct uniphier_clk_mux *mux;
struct clk_init_data init;
int ret;
mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
if (!mux)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &uniphier_clk_mux_ops;
init.flags = CLK_SET_RATE_PARENT;
init.parent_names = data->parent_names;
init.num_parents = data->num_parents,
mux->regmap = regmap;
mux->reg = data->reg;
mux->masks = data->masks;
mux->vals = data->vals;
mux->hw.init = &init;
ret = devm_clk_hw_register(dev, &mux->hw);
if (ret)
return ERR_PTR(ret);
return &mux->hw;
}
|
