drivers/power/reset/msm-poweroff.c

   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);