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/* Power off driver for i.mx6
* Copyright (c) 2014, FREESCALE CORPORATION. All rights reserved.
*
* based on msm-poweroff.c
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
static void __iomem *snvs_base;
static void do_imx_poweroff(void)
{
u32 value = readl(snvs_base);
/* set TOP and DP_EN bit */
writel(value | 0x60, snvs_base);
}
static int imx_poweroff_probe(struct platform_device *pdev)
{
snvs_base = of_iomap(pdev->dev.of_node, 0);
if (!snvs_base) {
dev_err(&pdev->dev, "failed to get memory\n");
return -ENODEV;
}
/*
* The Apalis/Colibri iMX6 modules cannot use PMIC_ON_REQ to shutdown
* the PMIC or the module could only be restarted by power cycling
* if the SNVS is supplied by a backup battery.
* compare with pm-imx6.c, imx6_stop_mode_poweroff()
*/
if (!of_machine_is_compatible("toradex,colibri_imx6dl") &&
!of_machine_is_compatible("toradex,apalis_imx6q"))
pm_power_off = do_imx_poweroff;
return 0;
}
static const struct of_device_id of_imx_poweroff_match[] = {
{ .compatible = "fsl,sec-v4.0-poweroff", },
{},
};
MODULE_DEVICE_TABLE(of, of_imx_poweroff_match);
static struct platform_driver imx_poweroff_driver = {
.probe = imx_poweroff_probe,
.driver = {
.name = "imx-snvs-poweroff",
.of_match_table = of_match_ptr(of_imx_poweroff_match),
},
};
static int __init imx_poweroff_init(void)
{
return platform_driver_register(&imx_poweroff_driver);
}
device_initcall(imx_poweroff_init);
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