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
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Exynos generic interconnect provider driver
*
* Copyright (c) 2020 Samsung Electronics Co., Ltd.
*
* Authors: Artur Świgoń <a.swigon@samsung.com>
* Sylwester Nawrocki <s.nawrocki@samsung.com>
*/
#include <linux/device.h>
#include <linux/interconnect-provider.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_qos.h>
#include <linux/slab.h>
#define EXYNOS_ICC_DEFAULT_BUS_CLK_RATIO 8
struct exynos_icc_priv {
struct device *dev;
/* One interconnect node per provider */
struct icc_provider provider;
struct icc_node *node;
struct dev_pm_qos_request qos_req;
u32 bus_clk_ratio;
};
static struct icc_node *exynos_icc_get_parent(struct device_node *np)
{
struct of_phandle_args args;
struct icc_node_data *icc_node_data;
struct icc_node *icc_node;
int num, ret;
num = of_count_phandle_with_args(np, "interconnects",
"#interconnect-cells");
if (num < 1)
return NULL; /* parent nodes are optional */
/* Get the interconnect target node */
ret = of_parse_phandle_with_args(np, "interconnects",
"#interconnect-cells", 0, &args);
if (ret < 0)
return ERR_PTR(ret);
icc_node_data = of_icc_get_from_provider(&args);
of_node_put(args.np);
if (IS_ERR(icc_node_data))
return ERR_CAST(icc_node_data);
icc_node = icc_node_data->node;
kfree(icc_node_data);
return icc_node;
}
static int exynos_generic_icc_set(struct icc_node *src, struct icc_node *dst)
{
struct exynos_icc_priv *src_priv = src->data, *dst_priv = dst->data;
s32 src_freq = max(src->avg_bw, src->peak_bw) / src_priv->bus_clk_ratio;
s32 dst_freq = max(dst->avg_bw, dst->peak_bw) / dst_priv->bus_clk_ratio;
int ret;
ret = dev_pm_qos_update_request(&src_priv->qos_req, src_freq);
if (ret < 0) {
dev_err(src_priv->dev, "failed to update PM QoS of %s (src)\n",
src->name);
return ret;
}
ret = dev_pm_qos_update_request(&dst_priv->qos_req, dst_freq);
if (ret < 0) {
dev_err(dst_priv->dev, "failed to update PM QoS of %s (dst)\n",
dst->name);
return ret;
}
return 0;
}
static struct icc_node *exynos_generic_icc_xlate(struct of_phandle_args *spec,
void *data)
{
struct exynos_icc_priv *priv = data;
if (spec->np != priv->dev->parent->of_node)
return ERR_PTR(-EINVAL);
return priv->node;
}
static void exynos_generic_icc_remove(struct platform_device *pdev)
{
struct exynos_icc_priv *priv = platform_get_drvdata(pdev);
icc_provider_deregister(&priv->provider);
icc_nodes_remove(&priv->provider);
}
static int exynos_generic_icc_probe(struct platform_device *pdev)
{
struct device *bus_dev = pdev->dev.parent;
struct exynos_icc_priv *priv;
struct icc_provider *provider;
struct icc_node *icc_node, *icc_parent_node;
int ret;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->dev = &pdev->dev;
platform_set_drvdata(pdev, priv);
provider = &priv->provider;
provider->set = exynos_generic_icc_set;
provider->aggregate = icc_std_aggregate;
provider->xlate = exynos_generic_icc_xlate;
provider->dev = bus_dev;
provider->inter_set = true;
provider->data = priv;
icc_provider_init(provider);
icc_node = icc_node_create(pdev->id);
if (IS_ERR(icc_node))
return PTR_ERR(icc_node);
priv->node = icc_node;
icc_node->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn",
bus_dev->of_node);
if (of_property_read_u32(bus_dev->of_node, "samsung,data-clock-ratio",
&priv->bus_clk_ratio))
priv->bus_clk_ratio = EXYNOS_ICC_DEFAULT_BUS_CLK_RATIO;
icc_node->data = priv;
icc_node_add(icc_node, provider);
/*
* Register a PM QoS request for the parent (devfreq) device.
*/
ret = dev_pm_qos_add_request(bus_dev, &priv->qos_req,
DEV_PM_QOS_MIN_FREQUENCY, 0);
if (ret < 0)
goto err_node_del;
icc_parent_node = exynos_icc_get_parent(bus_dev->of_node);
if (IS_ERR(icc_parent_node)) {
ret = PTR_ERR(icc_parent_node);
goto err_pmqos_del;
}
if (icc_parent_node) {
ret = icc_link_create(icc_node, icc_parent_node->id);
if (ret < 0)
goto err_pmqos_del;
}
ret = icc_provider_register(provider);
if (ret < 0)
goto err_pmqos_del;
return 0;
err_pmqos_del:
dev_pm_qos_remove_request(&priv->qos_req);
err_node_del:
icc_nodes_remove(provider);
return ret;
}
static struct platform_driver exynos_generic_icc_driver = {
.driver = {
.name = "exynos-generic-icc",
.sync_state = icc_sync_state,
},
.probe = exynos_generic_icc_probe,
.remove_new = exynos_generic_icc_remove,
};
module_platform_driver(exynos_generic_icc_driver);
MODULE_DESCRIPTION("Exynos generic interconnect driver");
MODULE_AUTHOR("Artur Świgoń <a.swigon@samsung.com>");
MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:exynos-generic-icc");
|
