LXR linux/arch/arm/mach-pxa/mfp-pxa3xx.c

   1/*
   2 * linux/arch/arm/mach-pxa/mfp.c
   3 *
   4 * PXA3xx Multi-Function Pin Support
   5 *
   6 * Copyright (C) 2007 Marvell Internation Ltd.
   7 *
   8 * 2007-08-21: eric miao <eric.miao@marvell.com>
   9 *             initial version
  10 *
  11 *  This program is free software; you can redistribute it and/or modify
  12 *  it under the terms of the GNU General Public License version 2 as
  13 *  published by the Free Software Foundation.
  14 */
  15
  16#include <linux/module.h>
  17#include <linux/kernel.h>
  18#include <linux/init.h>
  19#include <linux/io.h>
  20#include <linux/syscore_ops.h>
  21
  22#include <mach/hardware.h>
  23#include "mfp-pxa3xx.h"
  24#include <mach/pxa3xx-regs.h>
  25
  26#ifdef CONFIG_PM
  27/*
  28 * Configure the MFPs appropriately for suspend/resume.
  29 * FIXME: this should probably depend on which system state we're
  30 * entering - for instance, we might not want to place MFP pins in
  31 * a pull-down mode if they're an active low chip select, and we're
  32 * just entering standby.
  33 */
  34static int pxa3xx_mfp_suspend(void)
  35{
  36        mfp_config_lpm();
  37        return 0;
  38}
  39
  40static void pxa3xx_mfp_resume(void)
  41{
  42        mfp_config_run();
  43
  44        /* clear RDH bit when MFP settings are restored
  45         *
  46         * NOTE: the last 3 bits DxS are write-1-to-clear so carefully
  47         * preserve them here in case they will be referenced later
  48         */
  49        ASCR &= ~(ASCR_RDH | ASCR_D1S | ASCR_D2S | ASCR_D3S);
  50}
  51#else
  52#define pxa3xx_mfp_suspend      NULL
  53#define pxa3xx_mfp_resume       NULL
  54#endif
  55
  56struct syscore_ops pxa3xx_mfp_syscore_ops = {
  57        .suspend        = pxa3xx_mfp_suspend,
  58        .resume         = pxa3xx_mfp_resume,
  59};
  60