arch/arm/mach-pxa/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  */
  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 };