mfp-pxa3xx.c

 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 */
30static int pxa3xx_mfp_suspend(void *data)
31{
32	mfp_config_lpm();
33	return 0;
34}
35
36static void pxa3xx_mfp_resume(void *data)
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
52static const struct syscore_ops pxa3xx_mfp_syscore_ops = {
53	.suspend	= pxa3xx_mfp_suspend,
54	.resume		= pxa3xx_mfp_resume,
55};
56
57struct syscore pxa3xx_mfp_syscore = {
58	.ops = &pxa3xx_mfp_syscore_ops,
59};