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790440bc PM |
1 | /* |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License version 2 as | |
4 | * published by the Free Software Foundation. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * Copyright (C) 2012 ARM Limited | |
12 | */ | |
13 | ||
14 | #include <linux/jiffies.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/of_device.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/stat.h> | |
19 | #include <linux/vexpress.h> | |
20 | ||
65deb782 CM |
21 | #include <asm/system_misc.h> |
22 | ||
790440bc PM |
23 | static void vexpress_reset_do(struct device *dev, const char *what) |
24 | { | |
25 | int err = -ENOENT; | |
26 | struct vexpress_config_func *func = | |
27 | vexpress_config_func_get_by_dev(dev); | |
28 | ||
29 | if (func) { | |
30 | unsigned long timeout; | |
31 | ||
32 | err = vexpress_config_write(func, 0, 0); | |
33 | ||
34 | timeout = jiffies + HZ; | |
35 | while (time_before(jiffies, timeout)) | |
36 | cpu_relax(); | |
37 | } | |
38 | ||
39 | dev_emerg(dev, "Unable to %s (%d)\n", what, err); | |
40 | } | |
41 | ||
42 | static struct device *vexpress_power_off_device; | |
43 | ||
65deb782 | 44 | static void vexpress_power_off(void) |
790440bc PM |
45 | { |
46 | vexpress_reset_do(vexpress_power_off_device, "power off"); | |
47 | } | |
48 | ||
49 | static struct device *vexpress_restart_device; | |
50 | ||
65deb782 | 51 | static void vexpress_restart(char str, const char *cmd) |
790440bc PM |
52 | { |
53 | vexpress_reset_do(vexpress_restart_device, "restart"); | |
54 | } | |
55 | ||
56 | static ssize_t vexpress_reset_active_show(struct device *dev, | |
57 | struct device_attribute *attr, char *buf) | |
58 | { | |
59 | return sprintf(buf, "%d\n", vexpress_restart_device == dev); | |
60 | } | |
61 | ||
62 | static ssize_t vexpress_reset_active_store(struct device *dev, | |
63 | struct device_attribute *attr, const char *buf, size_t count) | |
64 | { | |
65 | long value; | |
66 | int err = kstrtol(buf, 0, &value); | |
67 | ||
68 | if (!err && value) | |
69 | vexpress_restart_device = dev; | |
70 | ||
71 | return err ? err : count; | |
72 | } | |
73 | ||
74 | DEVICE_ATTR(active, S_IRUGO | S_IWUSR, vexpress_reset_active_show, | |
75 | vexpress_reset_active_store); | |
76 | ||
77 | ||
78 | enum vexpress_reset_func { FUNC_RESET, FUNC_SHUTDOWN, FUNC_REBOOT }; | |
79 | ||
80 | static struct of_device_id vexpress_reset_of_match[] = { | |
81 | { | |
82 | .compatible = "arm,vexpress-reset", | |
83 | .data = (void *)FUNC_RESET, | |
84 | }, { | |
85 | .compatible = "arm,vexpress-shutdown", | |
86 | .data = (void *)FUNC_SHUTDOWN | |
87 | }, { | |
88 | .compatible = "arm,vexpress-reboot", | |
89 | .data = (void *)FUNC_REBOOT | |
90 | }, | |
91 | {} | |
92 | }; | |
93 | ||
94 | static int vexpress_reset_probe(struct platform_device *pdev) | |
95 | { | |
96 | enum vexpress_reset_func func; | |
97 | const struct of_device_id *match = | |
98 | of_match_device(vexpress_reset_of_match, &pdev->dev); | |
99 | ||
100 | if (match) | |
101 | func = (enum vexpress_reset_func)match->data; | |
102 | else | |
103 | func = pdev->id_entry->driver_data; | |
104 | ||
105 | switch (func) { | |
106 | case FUNC_SHUTDOWN: | |
107 | vexpress_power_off_device = &pdev->dev; | |
65deb782 | 108 | pm_power_off = vexpress_power_off; |
790440bc PM |
109 | break; |
110 | case FUNC_RESET: | |
111 | if (!vexpress_restart_device) | |
112 | vexpress_restart_device = &pdev->dev; | |
65deb782 | 113 | arm_pm_restart = vexpress_restart; |
790440bc PM |
114 | device_create_file(&pdev->dev, &dev_attr_active); |
115 | break; | |
116 | case FUNC_REBOOT: | |
117 | vexpress_restart_device = &pdev->dev; | |
65deb782 | 118 | arm_pm_restart = vexpress_restart; |
790440bc PM |
119 | device_create_file(&pdev->dev, &dev_attr_active); |
120 | break; | |
121 | }; | |
122 | ||
123 | return 0; | |
124 | } | |
125 | ||
126 | static const struct platform_device_id vexpress_reset_id_table[] = { | |
127 | { .name = "vexpress-reset", .driver_data = FUNC_RESET, }, | |
128 | { .name = "vexpress-shutdown", .driver_data = FUNC_SHUTDOWN, }, | |
129 | { .name = "vexpress-reboot", .driver_data = FUNC_REBOOT, }, | |
130 | {} | |
131 | }; | |
132 | ||
133 | static struct platform_driver vexpress_reset_driver = { | |
134 | .probe = vexpress_reset_probe, | |
135 | .driver = { | |
136 | .name = "vexpress-reset", | |
137 | .of_match_table = vexpress_reset_of_match, | |
138 | }, | |
139 | .id_table = vexpress_reset_id_table, | |
140 | }; | |
141 | ||
142 | static int __init vexpress_reset_init(void) | |
143 | { | |
144 | return platform_driver_register(&vexpress_reset_driver); | |
145 | } | |
146 | device_initcall(vexpress_reset_init); |