2 * linux/arch/arm/mach-pxa/mfp.c
4 * PXA3xx Multi-Function Pin Support
6 * Copyright (C) 2007 Marvell Internation Ltd.
8 * 2007-08-21: eric miao <eric.miao@marvell.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/init.h>
20 #include <linux/sysdev.h>
22 #include <mach/hardware.h>
23 #include <mach/mfp-pxa3xx.h>
24 #include <mach/pxa3xx-regs.h>
28 * Configure the MFPs appropriately for suspend/resume.
29 * FIXME: this should probably depend on which system state we're
30 * entering - for instance, we might not want to place MFP pins in
31 * a pull-down mode if they're an active low chip select, and we're
32 * just entering standby.
34 static int pxa3xx_mfp_suspend(struct sys_device *d, pm_message_t state)
40 static int pxa3xx_mfp_resume(struct sys_device *d)
44 /* clear RDH bit when MFP settings are restored
46 * NOTE: the last 3 bits DxS are write-1-to-clear so carefully
47 * preserve them here in case they will be referenced later
49 ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S);
53 #define pxa3xx_mfp_suspend NULL
54 #define pxa3xx_mfp_resume NULL
57 struct sysdev_class pxa3xx_mfp_sysclass = {
59 .suspend = pxa3xx_mfp_suspend,
60 .resume = pxa3xx_mfp_resume,
63 static int __init mfp_init_devicefs(void)
66 return sysdev_class_register(&pxa3xx_mfp_sysclass);
70 postcore_initcall(mfp_init_devicefs);