LXR linux/arch/arm/plat-samsung/pm-common.c

   1/*
   2 * Copyright (C) 2013 Samsung Electronics Co., Ltd.
   3 *      Tomasz Figa <t.figa@samsung.com>
   4 * Copyright (C) 2008 Openmoko, Inc.
   5 * Copyright (C) 2004-2008 Simtec Electronics
   6 *      Ben Dooks <ben@simtec.co.uk>
   7 *      http://armlinux.simtec.co.uk/
   8 *
   9 * Samsung common power management helper functions.
  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/io.h>
  17#include <linux/kernel.h>
  18
  19#include <plat/pm-common.h>
  20
  21/* helper functions to save and restore register state */
  22
  23/**
  24 * s3c_pm_do_save() - save a set of registers for restoration on resume.
  25 * @ptr: Pointer to an array of registers.
  26 * @count: Size of the ptr array.
  27 *
  28 * Run through the list of registers given, saving their contents in the
  29 * array for later restoration when we wakeup.
  30 */
  31void s3c_pm_do_save(struct sleep_save *ptr, int count)
  32{
  33        for (; count > 0; count--, ptr++) {
  34                ptr->val = __raw_readl(ptr->reg);
  35                S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
  36        }
  37}
  38
  39/**
  40 * s3c_pm_do_restore() - restore register values from the save list.
  41 * @ptr: Pointer to an array of registers.
  42 * @count: Size of the ptr array.
  43 *
  44 * Restore the register values saved from s3c_pm_do_save().
  45 *
  46 * Note, we do not use S3C_PMDBG() in here, as the system may not have
  47 * restore the UARTs state yet
  48*/
  49
  50void s3c_pm_do_restore(const struct sleep_save *ptr, int count)
  51{
  52        for (; count > 0; count--, ptr++) {
  53                pr_debug("restore %p (restore %08lx, was %08x)\n",
  54                                ptr->reg, ptr->val, __raw_readl(ptr->reg));
  55
  56                __raw_writel(ptr->val, ptr->reg);
  57        }
  58}
  59
  60/**
  61 * s3c_pm_do_restore_core() - early restore register values from save list.
  62 *
  63 * This is similar to s3c_pm_do_restore() except we try and minimise the
  64 * side effects of the function in case registers that hardware might need
  65 * to work has been restored.
  66 *
  67 * WARNING: Do not put any debug in here that may effect memory or use
  68 * peripherals, as things may be changing!
  69*/
  70
  71void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count)
  72{
  73        for (; count > 0; count--, ptr++)
  74                __raw_writel(ptr->val, ptr->reg);
  75}
  76