1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/arch/arm/mach-pxa/mfp.c 4 * 5 * PXA3xx Multi-Function Pin Support 6 * 7 * Copyright (C) 2007 Marvell Internation Ltd. 8 * 9 * 2007-08-21: eric miao <eric.miao@marvell.com> 10 * initial version 11 */ 12 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/init.h> 16 #include <linux/io.h> 17 #include <linux/syscore_ops.h> 18 19 #include "mfp-pxa3xx.h" 20 #include "pxa3xx-regs.h" 21 22 #ifdef CONFIG_PM 23 /* 24 * Configure the MFPs appropriately for suspend/resume. 25 * FIXME: this should probably depend on which system state we're 26 * entering - for instance, we might not want to place MFP pins in 27 * a pull-down mode if they're an active low chip select, and we're 28 * just entering standby. 29 */ 30 static int pxa3xx_mfp_suspend(void) 31 { 32 mfp_config_lpm(); 33 return 0; 34 } 35 36 static void pxa3xx_mfp_resume(void) 37 { 38 mfp_config_run(); 39 40 /* clear RDH bit when MFP settings are restored 41 * 42 * NOTE: the last 3 bits DxS are write-1-to-clear so carefully 43 * preserve them here in case they will be referenced later 44 */ 45 ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S); 46 } 47 #else 48 #define pxa3xx_mfp_suspend NULL 49 #define pxa3xx_mfp_resume NULL 50 #endif 51 52 struct syscore_ops pxa3xx_mfp_syscore_ops = { 53 .suspend = pxa3xx_mfp_suspend, 54 .resume = pxa3xx_mfp_resume, 55 }; 56