1/* 2 * linux/arch/arm/mach-pxa/mfp.c 3 * 4 * PXA3xx Multi-Function Pin Support 5 * 6 * Copyright (C) 2007 Marvell Internation Ltd. 7 * 8 * 2007-08-21: eric miao <eric.miao@marvell.com> 9 * initial version 10 * 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. 14 */ 15 16#include <linux/module.h> 17#include <linux/kernel.h> 18#include <linux/init.h> 19#include <linux/io.h> 20#include <linux/sysdev.h> 21 22#include <mach/hardware.h> 23#include <mach/mfp-pxa3xx.h> 24#include <mach/pxa3xx-regs.h> 25 26#ifdef CONFIG_PM 27static int pxa3xx_mfp_suspend(struct sys_device *d, pm_message_t state) 28{ 29 mfp_config_lpm(); 30 return 0; 31} 32 33static int pxa3xx_mfp_resume(struct sys_device *d) 34{ 35 mfp_config_run(); 36 37 /* clear RDH bit when MFP settings are restored 38 * 39 * NOTE: the last 3 bits DxS are write-1-to-clear so carefully 40 * preserve them here in case they will be referenced later 41 */ 42 ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S); 43 return 0; 44} 45#else 46#define pxa3xx_mfp_suspend NULL 47#define pxa3xx_mfp_resume NULL 48#endif 49 50struct sysdev_class pxa3xx_mfp_sysclass = { 51 .name = "mfp", 52 .suspend = pxa3xx_mfp_suspend, 53 .resume = pxa3xx_mfp_resume, 54}; 55 56static int __init mfp_init_devicefs(void) 57{ 58 if (cpu_is_pxa3xx()) 59 return sysdev_class_register(&pxa3xx_mfp_sysclass); 60 61 return 0; 62} 63postcore_initcall(mfp_init_devicefs); 64