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
173
174
175
176
177
|
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/clk-provider.h>
#include <linux/device/devres.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>
#include <soc/spacemit/ccu.h>
#include "ccu_common.h"
static DEFINE_IDA(auxiliary_ids);
static int spacemit_ccu_register(struct device *dev,
struct regmap *regmap,
struct regmap *lock_regmap,
const struct spacemit_ccu_data *data)
{
struct clk_hw_onecell_data *clk_data;
int i, ret;
/* Nothing to do if the CCU does not implement any clocks */
if (!data->hws)
return 0;
clk_data = devm_kzalloc(dev, struct_size(clk_data, hws, data->num),
GFP_KERNEL);
if (!clk_data)
return -ENOMEM;
clk_data->num = data->num;
for (i = 0; i < data->num; i++) {
struct clk_hw *hw = data->hws[i];
struct ccu_common *common;
const char *name;
if (!hw) {
clk_data->hws[i] = ERR_PTR(-ENOENT);
continue;
}
name = hw->init->name;
common = hw_to_ccu_common(hw);
common->regmap = regmap;
common->lock_regmap = lock_regmap;
ret = devm_clk_hw_register(dev, hw);
if (ret) {
dev_err(dev, "Cannot register clock %d - %s\n",
i, name);
return ret;
}
clk_data->hws[i] = hw;
}
ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, clk_data);
if (ret)
dev_err(dev, "failed to add clock hardware provider (%d)\n", ret);
return ret;
}
static void spacemit_cadev_release(struct device *dev)
{
struct auxiliary_device *adev = to_auxiliary_dev(dev);
ida_free(&auxiliary_ids, adev->id);
kfree(to_spacemit_ccu_adev(adev));
}
static void spacemit_adev_unregister(void *data)
{
struct auxiliary_device *adev = data;
auxiliary_device_delete(adev);
auxiliary_device_uninit(adev);
}
static int spacemit_ccu_reset_register(struct device *dev,
struct regmap *regmap,
const char *reset_name)
{
struct spacemit_ccu_adev *cadev;
struct auxiliary_device *adev;
int ret;
/* Nothing to do if the CCU does not implement a reset controller */
if (!reset_name)
return 0;
cadev = kzalloc_obj(*cadev);
if (!cadev)
return -ENOMEM;
cadev->regmap = regmap;
adev = &cadev->adev;
adev->name = reset_name;
adev->dev.parent = dev;
adev->dev.release = spacemit_cadev_release;
adev->dev.of_node = dev->of_node;
ret = ida_alloc(&auxiliary_ids, GFP_KERNEL);
if (ret < 0)
goto err_free_cadev;
adev->id = ret;
ret = auxiliary_device_init(adev);
if (ret)
goto err_free_aux_id;
ret = auxiliary_device_add(adev);
if (ret) {
auxiliary_device_uninit(adev);
return ret;
}
return devm_add_action_or_reset(dev, spacemit_adev_unregister, adev);
err_free_aux_id:
ida_free(&auxiliary_ids, adev->id);
err_free_cadev:
kfree(cadev);
return ret;
}
int spacemit_ccu_probe(struct platform_device *pdev, const char *compat)
{
struct regmap *base_regmap, *lock_regmap = NULL;
const struct spacemit_ccu_data *data;
struct device *dev = &pdev->dev;
int ret;
base_regmap = device_node_to_regmap(dev->of_node);
if (IS_ERR(base_regmap))
return dev_err_probe(dev, PTR_ERR(base_regmap),
"failed to get regmap\n");
/*
* The lock status of PLLs locate in MPMU region, while PLLs themselves
* are in APBS region. Reference to MPMU syscon is required to check PLL
* status.
*/
if (compat && of_device_is_compatible(dev->of_node, compat)) {
struct device_node *mpmu = of_parse_phandle(dev->of_node,
"spacemit,mpmu", 0);
if (!mpmu)
return dev_err_probe(dev, -ENODEV,
"Cannot parse MPMU region\n");
lock_regmap = device_node_to_regmap(mpmu);
of_node_put(mpmu);
if (IS_ERR(lock_regmap))
return dev_err_probe(dev, PTR_ERR(lock_regmap),
"failed to get lock regmap\n");
}
data = of_device_get_match_data(dev);
ret = spacemit_ccu_register(dev, base_regmap, lock_regmap, data);
if (ret)
return dev_err_probe(dev, ret, "failed to register clocks\n");
ret = spacemit_ccu_reset_register(dev, base_regmap, data->reset_name);
if (ret)
return dev_err_probe(dev, ret, "failed to register resets\n");
return 0;
}
EXPORT_SYMBOL_NS_GPL(spacemit_ccu_probe, "CLK_SPACEMIT");
MODULE_DESCRIPTION("SpacemiT CCU common clock driver");
MODULE_LICENSE("GPL");
|
