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
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