89 lines
2 KiB
C
89 lines
2 KiB
C
|
/*
|
||
|
|
* Suspend/resume support
|
||
|
|
*
|
||
|
|
* Copyright 2009 MontaVista Software, Inc.
|
||
|
|
*
|
||
|
|
* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or modify
|
||
|
|
* it under the terms of the GNU General Public License as published by
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (at your option) any later version.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/init.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/errno.h>
|
||
|
|
#include <linux/suspend.h>
|
||
|
|
#include <linux/delay.h>
|
||
|
|
#include <linux/device.h>
|
||
|
|
#include <linux/of_platform.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 struct platform_suspend_ops pmc_suspend_ops = {
|
||
|
|
.valid = pmc_suspend_valid,
|
||
|
|
.enter = pmc_suspend_enter,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int pmc_probe(struct of_device *ofdev, const struct of_device_id *id)
|
||
|
|
{
|
||
|
|
pmc_regs = of_iomap(ofdev->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 of_platform_driver pmc_driver = {
|
||
|
|
.driver.name = "fsl-pmc",
|
||
|
|
.match_table = pmc_ids,
|
||
|
|
.probe = pmc_probe,
|
||
|
|
};
|
||
|
|
|
||
|
|
static int __init pmc_init(void)
|
||
|
|
{
|
||
|
|
return of_register_platform_driver(&pmc_driver);
|
||
|
|
}
|
||
|
|
device_initcall(pmc_init);
|