| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* Copyright (c) 2013, The Linux Foundation. All rights reserved. |
| 3 | */ |
| 4 | |
| 5 | #include <linux/delay.h> |
| 6 | #include <linux/err.h> |
| 7 | #include <linux/init.h> |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/io.h> |
| 10 | #include <linux/of.h> |
| 11 | #include <linux/platform_device.h> |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/reboot.h> |
| 14 | #include <linux/pm.h> |
| 15 | |
| 16 | static void __iomem *msm_ps_hold; |
| 17 | static int deassert_pshold(struct notifier_block *nb, unsigned long action, |
| 18 | void *data) |
| 19 | { |
| 20 | writel(0, msm_ps_hold); |
| 21 | mdelay(10000); |
| 22 | |
| 23 | return NOTIFY_DONE; |
| 24 | } |
| 25 | |
| 26 | static struct notifier_block restart_nb = { |
| 27 | .notifier_call = deassert_pshold, |
| 28 | .priority = 128, |
| 29 | }; |
| 30 | |
| 31 | static void do_msm_poweroff(void) |
| 32 | { |
| 33 | deassert_pshold(&restart_nb, 0, NULL); |
| 34 | } |
| 35 | |
| 36 | static int msm_restart_probe(struct platform_device *pdev) |
| 37 | { |
| 38 | msm_ps_hold = devm_platform_ioremap_resource(pdev, 0); |
| 39 | if (IS_ERR(msm_ps_hold)) |
| 40 | return PTR_ERR(msm_ps_hold); |
| 41 | |
| 42 | register_restart_handler(&restart_nb); |
| 43 | |
| 44 | pm_power_off = do_msm_poweroff; |
| 45 | |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | static const struct of_device_id of_msm_restart_match[] = { |
| 50 | { .compatible = "qcom,pshold", }, |
| 51 | {}, |
| 52 | }; |
| 53 | MODULE_DEVICE_TABLE(of, of_msm_restart_match); |
| 54 | |
| 55 | static struct platform_driver msm_restart_driver = { |
| 56 | .probe = msm_restart_probe, |
| 57 | .driver = { |
| 58 | .name = "msm-restart", |
| 59 | .of_match_table = of_match_ptr(of_msm_restart_match), |
| 60 | }, |
| 61 | }; |
| 62 | builtin_platform_driver(msm_restart_driver); |