This source file includes following definitions.
- zynqmp_pm_get_callback_data
- zynqmp_pm_isr
- suspend_mode_show
- suspend_mode_store
- zynqmp_pm_probe
- zynqmp_pm_remove
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12 #include <linux/mailbox_client.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
15 #include <linux/reboot.h>
16 #include <linux/suspend.h>
17
18 #include <linux/firmware/xlnx-zynqmp.h>
19
20 enum pm_suspend_mode {
21 PM_SUSPEND_MODE_FIRST = 0,
22 PM_SUSPEND_MODE_STD = PM_SUSPEND_MODE_FIRST,
23 PM_SUSPEND_MODE_POWER_OFF,
24 };
25
26 #define PM_SUSPEND_MODE_FIRST PM_SUSPEND_MODE_STD
27
28 static const char *const suspend_modes[] = {
29 [PM_SUSPEND_MODE_STD] = "standard",
30 [PM_SUSPEND_MODE_POWER_OFF] = "power-off",
31 };
32
33 static enum pm_suspend_mode suspend_mode = PM_SUSPEND_MODE_STD;
34 static const struct zynqmp_eemi_ops *eemi_ops;
35
36 enum pm_api_cb_id {
37 PM_INIT_SUSPEND_CB = 30,
38 PM_ACKNOWLEDGE_CB,
39 PM_NOTIFY_CB,
40 };
41
42 static void zynqmp_pm_get_callback_data(u32 *buf)
43 {
44 zynqmp_pm_invoke_fn(GET_CALLBACK_DATA, 0, 0, 0, 0, buf);
45 }
46
47 static irqreturn_t zynqmp_pm_isr(int irq, void *data)
48 {
49 u32 payload[CB_PAYLOAD_SIZE];
50
51 zynqmp_pm_get_callback_data(payload);
52
53
54 if (payload[0] == PM_INIT_SUSPEND_CB) {
55 switch (payload[1]) {
56 case SUSPEND_SYSTEM_SHUTDOWN:
57 orderly_poweroff(true);
58 break;
59 case SUSPEND_POWER_REQUEST:
60 pm_suspend(PM_SUSPEND_MEM);
61 break;
62 default:
63 pr_err("%s Unsupported InitSuspendCb reason "
64 "code %d\n", __func__, payload[1]);
65 }
66 }
67
68 return IRQ_HANDLED;
69 }
70
71 static ssize_t suspend_mode_show(struct device *dev,
72 struct device_attribute *attr, char *buf)
73 {
74 char *s = buf;
75 int md;
76
77 for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
78 if (suspend_modes[md]) {
79 if (md == suspend_mode)
80 s += sprintf(s, "[%s] ", suspend_modes[md]);
81 else
82 s += sprintf(s, "%s ", suspend_modes[md]);
83 }
84
85
86 if (s != buf)
87 *(s - 1) = '\n';
88 return (s - buf);
89 }
90
91 static ssize_t suspend_mode_store(struct device *dev,
92 struct device_attribute *attr,
93 const char *buf, size_t count)
94 {
95 int md, ret = -EINVAL;
96
97 if (!eemi_ops->set_suspend_mode)
98 return ret;
99
100 for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
101 if (suspend_modes[md] &&
102 sysfs_streq(suspend_modes[md], buf)) {
103 ret = 0;
104 break;
105 }
106
107 if (!ret && md != suspend_mode) {
108 ret = eemi_ops->set_suspend_mode(md);
109 if (likely(!ret))
110 suspend_mode = md;
111 }
112
113 return ret ? ret : count;
114 }
115
116 static DEVICE_ATTR_RW(suspend_mode);
117
118 static int zynqmp_pm_probe(struct platform_device *pdev)
119 {
120 int ret, irq;
121 u32 pm_api_version;
122
123 eemi_ops = zynqmp_pm_get_eemi_ops();
124 if (IS_ERR(eemi_ops))
125 return PTR_ERR(eemi_ops);
126
127 if (!eemi_ops->get_api_version || !eemi_ops->init_finalize)
128 return -ENXIO;
129
130 eemi_ops->init_finalize();
131 eemi_ops->get_api_version(&pm_api_version);
132
133
134 if (pm_api_version < ZYNQMP_PM_VERSION)
135 return -ENODEV;
136
137 irq = platform_get_irq(pdev, 0);
138 if (irq <= 0)
139 return -ENXIO;
140
141 ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, zynqmp_pm_isr,
142 IRQF_NO_SUSPEND | IRQF_ONESHOT,
143 dev_name(&pdev->dev), &pdev->dev);
144 if (ret) {
145 dev_err(&pdev->dev, "devm_request_threaded_irq '%d' failed "
146 "with %d\n", irq, ret);
147 return ret;
148 }
149
150 ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
151 if (ret) {
152 dev_err(&pdev->dev, "unable to create sysfs interface\n");
153 return ret;
154 }
155
156 return 0;
157 }
158
159 static int zynqmp_pm_remove(struct platform_device *pdev)
160 {
161 sysfs_remove_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
162
163 return 0;
164 }
165
166 static const struct of_device_id pm_of_match[] = {
167 { .compatible = "xlnx,zynqmp-power", },
168 { },
169 };
170 MODULE_DEVICE_TABLE(of, pm_of_match);
171
172 static struct platform_driver zynqmp_pm_platform_driver = {
173 .probe = zynqmp_pm_probe,
174 .remove = zynqmp_pm_remove,
175 .driver = {
176 .name = "zynqmp_power",
177 .of_match_table = pm_of_match,
178 },
179 };
180 module_platform_driver(zynqmp_pm_platform_driver);