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 <mach/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  */
  34 static int pxa3xx_mfp_suspend(void)
  35 {
  36         mfp_config_lpm();
  37         return 0;
  38 }
  39
  40 static 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
  56 struct syscore_ops pxa3xx_mfp_syscore_ops = {
  57         .suspend        = pxa3xx_mfp_suspend,
  58         .resume         = pxa3xx_mfp_resume,
  59 };