// SPDX-License-Identifier: GPL-2.0-or-later/* * Suspend/resume support * * Copyright 2009  MontaVista Software, Inc. * * Author: Anton Vorontsov <avorontsov@ru.mvista.com> */ #include <linux/init.h>#include <linux/types.h>#include <linux/errno.h>#include <linux/export.h>#include <linux/suspend.h>#include <linux/delay.h>#include <linux/of_address.h>#include <linux/platform_device.h> struct pmc_regs {	__be32 devdisr;	__be32 devdisr2;	__be32 :32;	__be32 :32;	__be32 pmcsr;#define PMCSR_SLP	(1 << 17)}; static struct device *pmc_dev;static struct pmc_regs __iomem *pmc_regs; static int pmc_suspend_enter(suspend_state_t state){	int ret; 	setbits32(&pmc_regs->pmcsr, PMCSR_SLP);	/* At this point, the CPU is asleep. */ 	/* Upon resume, wait for SLP bit to be clear. */	ret = spin_event_timeout((in_be32(&pmc_regs->pmcsr) & PMCSR_SLP) == 0,				 10000, 10) ? 0 : -ETIMEDOUT;	if (ret)		dev_err(pmc_dev, "tired waiting for SLP bit to clear\n");	return ret;} static int pmc_suspend_valid(suspend_state_t state){	if (state != PM_SUSPEND_STANDBY)		return 0;	return 1;} static const struct platform_suspend_ops pmc_suspend_ops = {	.valid = pmc_suspend_valid,	.enter = pmc_suspend_enter,}; static int pmc_probe(struct platform_device *ofdev){	pmc_regs = of_iomap(ofdev->dev.of_node, 0);	if (!pmc_regs)		return -ENOMEM; 	pmc_dev = &ofdev->dev;	suspend_set_ops(&pmc_suspend_ops);	return 0;} static const struct of_device_id pmc_ids[] = {	{ .compatible = "fsl,mpc8548-pmc", },	{ .compatible = "fsl,mpc8641d-pmc", },	{ },}; static struct platform_driver pmc_driver = {	.driver = {		.name = "fsl-pmc",		.of_match_table = pmc_ids,	},	.probe = pmc_probe,}; builtin_platform_driver(pmc_driver);