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 | |