cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

pm-common.c (2120B)

      1// SPDX-License-Identifier: GPL-2.0
      2//
      3// Copyright (C) 2013 Samsung Electronics Co., Ltd.
      4//	Tomasz Figa <t.figa@samsung.com>
      5// Copyright (C) 2008 Openmoko, Inc.
      6// Copyright (C) 2004-2008 Simtec Electronics
      7//	Ben Dooks <ben@simtec.co.uk>
      8//	http://armlinux.simtec.co.uk/
      9//
     10// Samsung common power management helper functions.
     11
     12#include <linux/io.h>
     13#include <linux/kernel.h>
     14
     15#include "pm-common.h"
     16
     17/* helper functions to save and restore register state */
     18
     19/**
     20 * s3c_pm_do_save() - save a set of registers for restoration on resume.
     21 * @ptr: Pointer to an array of registers.
     22 * @count: Size of the ptr array.
     23 *
     24 * Run through the list of registers given, saving their contents in the
     25 * array for later restoration when we wakeup.
     26 */
     27void s3c_pm_do_save(struct sleep_save *ptr, int count)
     28{
     29	for (; count > 0; count--, ptr++) {
     30		ptr->val = readl_relaxed(ptr->reg);
     31		S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
     32	}
     33}
     34
     35/**
     36 * s3c_pm_do_restore() - restore register values from the save list.
     37 * @ptr: Pointer to an array of registers.
     38 * @count: Size of the ptr array.
     39 *
     40 * Restore the register values saved from s3c_pm_do_save().
     41 *
     42 * Note, we do not use S3C_PMDBG() in here, as the system may not have
     43 * restore the UARTs state yet
     44*/
     45
     46void s3c_pm_do_restore(const struct sleep_save *ptr, int count)
     47{
     48	for (; count > 0; count--, ptr++) {
     49		pr_debug("restore %p (restore %08lx, was %08x)\n",
     50				ptr->reg, ptr->val, readl_relaxed(ptr->reg));
     51
     52		writel_relaxed(ptr->val, ptr->reg);
     53	}
     54}
     55
     56/**
     57 * s3c_pm_do_restore_core() - early restore register values from save list.
     58 * @ptr: Pointer to an array of registers.
     59 * @count: Size of the ptr array.
     60 *
     61 * This is similar to s3c_pm_do_restore() except we try and minimise the
     62 * side effects of the function in case registers that hardware might need
     63 * to work has been restored.
     64 *
     65 * WARNING: Do not put any debug in here that may effect memory or use
     66 * peripherals, as things may be changing!
     67*/
     68
     69void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count)
     70{
     71	for (; count > 0; count--, ptr++)
     72		writel_relaxed(ptr->val, ptr->reg);
     73}