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/*
* linux/arch/arm/mach-pxa/mfp.c
*
* PXA3xx Multi-Function Pin Support
*
* Copyright (C) 2007 Marvell Internation Ltd.
*
* 2007-08-21: eric miao <eric.miao@marvell.com>
* initial version
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/sysdev.h>
#include <mach/hardware.h>
#include <mach/mfp-pxa3xx.h>
#include <mach/pxa3xx-regs.h>
#ifdef CONFIG_PM
/*
* Configure the MFPs appropriately for suspend/resume.
* FIXME: this should probably depend on which system state we're
* entering - for instance, we might not want to place MFP pins in
* a pull-down mode if they're an active low chip select, and we're
* just entering standby.
*/
static int pxa3xx_mfp_suspend(struct sys_device *d, pm_message_t state)
{
mfp_config_lpm();
return 0;
}
static int pxa3xx_mfp_resume(struct sys_device *d)
{
mfp_config_run();
/* clear RDH bit when MFP settings are restored
*
* NOTE: the last 3 bits DxS are write-1-to-clear so carefully
* preserve them here in case they will be referenced later
*/
ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S);
return 0;
}
#else
#define pxa3xx_mfp_suspend NULL
#define pxa3xx_mfp_resume NULL
#endif
struct sysdev_class pxa3xx_mfp_sysclass = {
.name = "mfp",
.suspend = pxa3xx_mfp_suspend,
.resume = pxa3xx_mfp_resume,
};
static int __init mfp_init_devicefs(void)
{
if (cpu_is_pxa3xx())
return sysdev_class_register(&pxa3xx_mfp_sysclass);
return 0;
}
postcore_initcall(mfp_init_devicefs);
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