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
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
* Copyright (c) 2014,2015, Linaro Ltd.
*
* SAW power controller driver
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/cpuidle.h>
#include <linux/cpu_pm.h>
#include <linux/qcom_scm.h>
#include <soc/qcom/spm.h>
#include <asm/proc-fns.h>
#include <asm/suspend.h>
#include "dt_idle_states.h"
struct cpuidle_qcom_spm_data {
struct cpuidle_driver cpuidle_driver;
struct spm_driver_data *spm;
};
static int qcom_pm_collapse(unsigned long int unused)
{
qcom_scm_cpu_power_down(QCOM_SCM_CPU_PWR_DOWN_L2_ON);
/*
* Returns here only if there was a pending interrupt and we did not
* power down as a result.
*/
return -1;
}
static int qcom_cpu_spc(struct spm_driver_data *drv)
{
int ret;
spm_set_low_power_mode(drv, PM_SLEEP_MODE_SPC);
ret = cpu_suspend(0, qcom_pm_collapse);
/*
* ARM common code executes WFI without calling into our driver and
* if the SPM mode is not reset, then we may accidently power down the
* cpu when we intended only to gate the cpu clock.
* Ensure the state is set to standby before returning.
*/
spm_set_low_power_mode(drv, PM_SLEEP_MODE_STBY);
return ret;
}
static int spm_enter_idle_state(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int idx)
{
struct cpuidle_qcom_spm_data *data = container_of(drv, struct cpuidle_qcom_spm_data,
cpuidle_driver);
return CPU_PM_CPU_IDLE_ENTER_PARAM(qcom_cpu_spc, idx, data->spm);
}
static struct cpuidle_driver qcom_spm_idle_driver = {
.name = "qcom_spm",
.owner = THIS_MODULE,
.states[0] = {
.enter = spm_enter_idle_state,
.exit_latency = 1,
.target_residency = 1,
.power_usage = UINT_MAX,
.name = "WFI",
.desc = "ARM WFI",
}
};
static const struct of_device_id qcom_idle_state_match[] = {
{ .compatible = "qcom,idle-state-spc", .data = spm_enter_idle_state },
{ },
};
static int spm_cpuidle_register(struct device *cpuidle_dev, int cpu)
{
struct platform_device *pdev = NULL;
struct device_node *cpu_node, *saw_node;
struct cpuidle_qcom_spm_data *data = NULL;
int ret;
cpu_node = of_cpu_device_node_get(cpu);
if (!cpu_node)
return -ENODEV;
saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
if (!saw_node)
return -ENODEV;
pdev = of_find_device_by_node(saw_node);
of_node_put(saw_node);
of_node_put(cpu_node);
if (!pdev)
return -ENODEV;
data = devm_kzalloc(cpuidle_dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->spm = dev_get_drvdata(&pdev->dev);
if (!data->spm)
return -EINVAL;
data->cpuidle_driver = qcom_spm_idle_driver;
data->cpuidle_driver.cpumask = (struct cpumask *)cpumask_of(cpu);
ret = dt_init_idle_driver(&data->cpuidle_driver,
qcom_idle_state_match, 1);
if (ret <= 0)
return ret ? : -ENODEV;
return cpuidle_register(&data->cpuidle_driver, NULL);
}
static int spm_cpuidle_drv_probe(struct platform_device *pdev)
{
int cpu, ret;
if (!qcom_scm_is_available())
return -EPROBE_DEFER;
ret = qcom_scm_set_warm_boot_addr(cpu_resume_arm);
if (ret)
return dev_err_probe(&pdev->dev, ret, "set warm boot addr failed");
for_each_possible_cpu(cpu) {
ret = spm_cpuidle_register(&pdev->dev, cpu);
if (ret && ret != -ENODEV) {
dev_err(&pdev->dev,
"Cannot register for CPU%d: %d\n", cpu, ret);
}
}
return 0;
}
static struct platform_driver spm_cpuidle_driver = {
.probe = spm_cpuidle_drv_probe,
.driver = {
.name = "qcom-spm-cpuidle",
.suppress_bind_attrs = true,
},
};
static bool __init qcom_spm_find_any_cpu(void)
{
struct device_node *cpu_node, *saw_node;
for_each_of_cpu_node(cpu_node) {
saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
if (of_device_is_available(saw_node)) {
of_node_put(saw_node);
of_node_put(cpu_node);
return true;
}
of_node_put(saw_node);
}
return false;
}
static int __init qcom_spm_cpuidle_init(void)
{
struct platform_device *pdev;
int ret;
ret = platform_driver_register(&spm_cpuidle_driver);
if (ret)
return ret;
/* Make sure there is actually any CPU managed by the SPM */
if (!qcom_spm_find_any_cpu())
return 0;
pdev = platform_device_register_simple("qcom-spm-cpuidle",
-1, NULL, 0);
if (IS_ERR(pdev)) {
platform_driver_unregister(&spm_cpuidle_driver);
return PTR_ERR(pdev);
}
return 0;
}
device_initcall(qcom_spm_cpuidle_init);
|
