1/* Power off driver for i.mx6 2 * Copyright (c) 2014, FREESCALE CORPORATION. All rights reserved. 3 * 4 * based on msm-poweroff.c 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 and 8 * only version 2 as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 */ 16 17#include <linux/err.h> 18#include <linux/init.h> 19#include <linux/io.h> 20#include <linux/kernel.h> 21#include <linux/module.h> 22#include <linux/of.h> 23#include <linux/of_address.h> 24#include <linux/platform_device.h> 25 26static void __iomem *snvs_base; 27 28static void do_imx_poweroff(void) 29{ 30 u32 value = readl(snvs_base); 31 32 /* set TOP and DP_EN bit */ 33 writel(value | 0x60, snvs_base); 34} 35 36static int imx_poweroff_probe(struct platform_device *pdev) 37{ 38 snvs_base = of_iomap(pdev->dev.of_node, 0); 39 if (!snvs_base) { 40 dev_err(&pdev->dev, "failed to get memory\n"); 41 return -ENODEV; 42 } 43 44 pm_power_off = do_imx_poweroff; 45 return 0; 46} 47 48static const struct of_device_id of_imx_poweroff_match[] = { 49 { .compatible = "fsl,sec-v4.0-poweroff", }, 50 {}, 51}; 52MODULE_DEVICE_TABLE(of, of_imx_poweroff_match); 53 54static struct platform_driver imx_poweroff_driver = { 55 .probe = imx_poweroff_probe, 56 .driver = { 57 .name = "imx-snvs-poweroff", 58 .of_match_table = of_match_ptr(of_imx_poweroff_match), 59 }, 60}; 61 62static int __init imx_poweroff_init(void) 63{ 64 return platform_driver_register(&imx_poweroff_driver); 65} 66device_initcall(imx_poweroff_init); 67