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
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
// SPDX-License-Identifier: GPL-2.0+
/*
* Texas Instruments System Control Interface (TI SCI) clock driver
*
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
* Andreas Dannenberg <dannenberg@ti.com>
*
* Loosely based on Linux kernel sci-clk.c...
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <clk-uclass.h>
#include <linux/soc/ti/ti_sci_protocol.h>
/**
* struct ti_sci_clk_data - clock controller information structure
* @sci: TI SCI handle used for communication with system controller
*/
struct ti_sci_clk_data {
const struct ti_sci_handle *sci;
};
static int ti_sci_clk_probe(struct udevice *dev)
{
struct ti_sci_clk_data *data = dev_get_priv(dev);
debug("%s(dev=%p)\n", __func__, dev);
if (!data)
return -ENOMEM;
/* Store handle for communication with the system controller */
data->sci = ti_sci_get_handle(dev);
if (IS_ERR(data->sci))
return PTR_ERR(data->sci);
return 0;
}
static int ti_sci_clk_of_xlate(struct clk *clk,
struct ofnode_phandle_args *args)
{
debug("%s(clk=%p, args_count=%d)\n", __func__, clk, args->args_count);
if (args->args_count != 2) {
debug("Invalid args_count: %d\n", args->args_count);
return -EINVAL;
}
/*
* On TI SCI-based devices, the clock provider id field is used as a
* device ID, and the data field is used as the associated sub-ID.
*/
clk->id = args->args[0];
clk->data = args->args[1];
return 0;
}
static int ti_sci_clk_request(struct clk *clk)
{
debug("%s(clk=%p)\n", __func__, clk);
return 0;
}
static int ti_sci_clk_free(struct clk *clk)
{
debug("%s(clk=%p)\n", __func__, clk);
return 0;
}
static ulong ti_sci_clk_get_rate(struct clk *clk)
{
struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
u64 current_freq;
int ret;
debug("%s(clk=%p)\n", __func__, clk);
ret = cops->get_freq(sci, clk->id, clk->data, ¤t_freq);
if (ret) {
dev_err(clk->dev, "%s: get_freq failed (%d)\n", __func__, ret);
return ret;
}
debug("%s(current_freq=%llu)\n", __func__, current_freq);
return current_freq;
}
static ulong ti_sci_clk_set_rate(struct clk *clk, ulong rate)
{
struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
int ret;
debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate);
/* Ask for exact frequency by using same value for min/target/max */
ret = cops->set_freq(sci, clk->id, clk->data, rate, rate, rate);
if (ret)
dev_err(clk->dev, "%s: set_freq failed (%d)\n", __func__, ret);
return ret;
}
static int ti_sci_clk_set_parent(struct clk *clk, struct clk *parent)
{
struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
u8 num_parents;
u8 parent_cid;
int ret;
debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent);
/* Make sure the clock parent is valid for a given device ID */
if (clk->id != parent->id)
return -EINVAL;
/* Make sure clock has parents that can be set */
ret = cops->get_num_parents(sci, clk->id, clk->data, &num_parents);
if (ret) {
dev_err(clk->dev, "%s: get_num_parents failed (%d)\n",
__func__, ret);
return ret;
}
if (num_parents < 2) {
dev_err(clk->dev, "%s: clock has no settable parents!\n",
__func__);
return -EINVAL;
}
/* Make sure parent clock ID is valid */
parent_cid = parent->data - clk->data - 1;
if (parent_cid >= num_parents) {
dev_err(clk->dev, "%s: invalid parent clock!\n", __func__);
return -EINVAL;
}
/* Ready to proceed to configure the new clock parent */
ret = cops->set_parent(sci, clk->id, clk->data, parent->data);
if (ret)
dev_err(clk->dev, "%s: set_parent failed (%d)\n", __func__,
ret);
return ret;
}
static int ti_sci_clk_enable(struct clk *clk)
{
struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
int ret;
debug("%s(clk=%p)\n", __func__, clk);
/*
* Allow the System Controller to automatically manage the state of
* this clock. If the device is enabled, then the clock is enabled.
*/
ret = cops->put_clock(sci, clk->id, clk->data);
if (ret)
dev_err(clk->dev, "%s: put_clock failed (%d)\n", __func__, ret);
return ret;
}
static int ti_sci_clk_disable(struct clk *clk)
{
struct ti_sci_clk_data *data = dev_get_priv(clk->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_clk_ops *cops = &sci->ops.clk_ops;
int ret;
debug("%s(clk=%p)\n", __func__, clk);
/* Unconditionally disable clock, regardless of state of the device */
ret = cops->idle_clock(sci, clk->id, clk->data);
if (ret)
dev_err(clk->dev, "%s: idle_clock failed (%d)\n", __func__,
ret);
return ret;
}
static const struct udevice_id ti_sci_clk_of_match[] = {
{ .compatible = "ti,k2g-sci-clk" },
{ /* sentinel */ },
};
static struct clk_ops ti_sci_clk_ops = {
.of_xlate = ti_sci_clk_of_xlate,
.request = ti_sci_clk_request,
.free = ti_sci_clk_free,
.get_rate = ti_sci_clk_get_rate,
.set_rate = ti_sci_clk_set_rate,
.set_parent = ti_sci_clk_set_parent,
.enable = ti_sci_clk_enable,
.disable = ti_sci_clk_disable,
};
U_BOOT_DRIVER(ti_sci_clk) = {
.name = "ti-sci-clk",
.id = UCLASS_CLK,
.of_match = ti_sci_clk_of_match,
.probe = ti_sci_clk_probe,
.priv_auto_alloc_size = sizeof(struct ti_sci_clk_data),
.ops = &ti_sci_clk_ops,
};
|
