LXR linux/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 <mach/hardware.h>
  20#include "mfp-pxa3xx.h"
  21#include <mach/pxa3xx-regs.h>
  22
  23#ifdef CONFIG_PM
  24/*
  25 * Configure the MFPs appropriately for suspend/resume.
  26 * FIXME: this should probably depend on which system state we're
  27 * entering - for instance, we might not want to place MFP pins in
  28 * a pull-down mode if they're an active low chip select, and we're
  29 * just entering standby.
  30 */
  31static int pxa3xx_mfp_suspend(void)
  32{
  33        mfp_config_lpm();
  34        return 0;
  35}
  36
  37static void pxa3xx_mfp_resume(void)
  38{
  39        mfp_config_run();
  40
  41        /* clear RDH bit when MFP settings are restored
  42         *
  43         * NOTE: the last 3 bits DxS are write-1-to-clear so carefully
  44         * preserve them here in case they will be referenced later
  45         */
  46        ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S);
  47}
  48#else
  49#define pxa3xx_mfp_suspend      NULL
  50#define pxa3xx_mfp_resume       NULL
  51#endif
  52
  53struct syscore_ops pxa3xx_mfp_syscore_ops = {
  54        .suspend        = pxa3xx_mfp_suspend,
  55        .resume         = pxa3xx_mfp_resume,
  56};
  57