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