1 /* Copyright (c) 2013, The Linux Foundation. All rights reserved.
2  *
3  * This program is free software; you can redistribute it and/or modify
4  * it under the terms of the GNU General Public License version 2 and
5  * only version 2 as published by the Free Software Foundation.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
10  * GNU General Public License for more details.
11  *
12  */
13 
14 #include <linux/delay.h>
15 #include <linux/err.h>
16 #include <linux/init.h>
17 #include <linux/kernel.h>
18 #include <linux/io.h>
19 #include <linux/of.h>
20 #include <linux/platform_device.h>
21 #include <linux/module.h>
22 #include <linux/reboot.h>
23 
24 #include <asm/system_misc.h>
25 
26 static void __iomem *msm_ps_hold;
27 
28 static void do_msm_restart(enum reboot_mode reboot_mode, const char *cmd)
29 {
30 	writel(0, msm_ps_hold);
31 	mdelay(10000);
32 }
33 
34 static void do_msm_poweroff(void)
35 {
36 	/* TODO: Add poweroff capability */
37 	do_msm_restart(REBOOT_HARD, NULL);
38 }
39 
40 static int msm_restart_probe(struct platform_device *pdev)
41 {
42 	struct device *dev = &pdev->dev;
43 	struct resource *mem;
44 
45 	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
46 	msm_ps_hold = devm_ioremap_resource(dev, mem);
47 	if (IS_ERR(msm_ps_hold))
48 		return PTR_ERR(msm_ps_hold);
49 
50 	pm_power_off = do_msm_poweroff;
51 	arm_pm_restart = do_msm_restart;
52 	return 0;
53 }
54 
55 static const struct of_device_id of_msm_restart_match[] = {
56 	{ .compatible = "qcom,pshold", },
57 	{},
58 };
59 MODULE_DEVICE_TABLE(of, of_msm_restart_match);
60 
61 static struct platform_driver msm_restart_driver = {
62 	.probe = msm_restart_probe,
63 	.driver = {
64 		.name = "msm-restart",
65 		.of_match_table = of_match_ptr(of_msm_restart_match),
66 	},
67 };
68 
69 static int __init msm_restart_init(void)
70 {
71 	return platform_driver_register(&msm_restart_driver);
72 }
73 device_initcall(msm_restart_init);
74