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 <mach/hardware.h> 20 #include "mfp-pxa3xx.h" 21 #include <mach/pxa3xx-regs.h> 22 23 #ifdef CONFIG_PM 24 /* 25 * Configure the MFPs appropriately for suspend/resume. 26 * FIXME: this should probably depend on which system state we're 27 * entering - for instance, we might not want to place MFP pins in 28 * a pull-down mode if they're an active low chip select, and we're 29 * just entering standby. 30 */ 31 static int pxa3xx_mfp_suspend(void) 32 { 33 mfp_config_lpm(); 34 return 0; 35 } 36 37 static void pxa3xx_mfp_resume(void) 38 { 39 mfp_config_run(); 40 41 /* clear RDH bit when MFP settings are restored 42 * 43 * NOTE: the last 3 bits DxS are write-1-to-clear so carefully 44 * preserve them here in case they will be referenced later 45 */ 46 ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S); 47 } 48 #else 49 #define pxa3xx_mfp_suspend NULL 50 #define pxa3xx_mfp_resume NULL 51 #endif 52 53 struct syscore_ops pxa3xx_mfp_syscore_ops = { 54 .suspend = pxa3xx_mfp_suspend, 55 .resume = pxa3xx_mfp_resume, 56 }; 57