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  */
pxa3xx_mfp_suspend(void)30 static int pxa3xx_mfp_suspend(void)
31 {
32 	mfp_config_lpm();
33 	return 0;
34 }
35 
pxa3xx_mfp_resume(void)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