74 lines
2.1 KiB
C
74 lines
2.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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//
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// Copyright (C) 2013 Samsung Electronics Co., Ltd.
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// Tomasz Figa <t.figa@samsung.com>
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// Copyright (C) 2008 Openmoko, Inc.
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// Copyright (C) 2004-2008 Simtec Electronics
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// Ben Dooks <ben@simtec.co.uk>
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// http://armlinux.simtec.co.uk/
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//
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// Samsung common power management helper functions.
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include "pm-common.h"
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/* helper functions to save and restore register state */
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/**
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* s3c_pm_do_save() - save a set of registers for restoration on resume.
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* @ptr: Pointer to an array of registers.
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* @count: Size of the ptr array.
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*
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* Run through the list of registers given, saving their contents in the
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* array for later restoration when we wakeup.
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*/
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void s3c_pm_do_save(struct sleep_save *ptr, int count)
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{
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for (; count > 0; count--, ptr++) {
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ptr->val = readl_relaxed(ptr->reg);
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S3C_PMDBG("saved %p value %08lx\n", ptr->reg, ptr->val);
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}
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}
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/**
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* s3c_pm_do_restore() - restore register values from the save list.
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* @ptr: Pointer to an array of registers.
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* @count: Size of the ptr array.
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*
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* Restore the register values saved from s3c_pm_do_save().
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*
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* Note, we do not use S3C_PMDBG() in here, as the system may not have
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* restore the UARTs state yet
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*/
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void s3c_pm_do_restore(const struct sleep_save *ptr, int count)
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{
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for (; count > 0; count--, ptr++) {
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pr_debug("restore %p (restore %08lx, was %08x)\n",
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ptr->reg, ptr->val, readl_relaxed(ptr->reg));
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writel_relaxed(ptr->val, ptr->reg);
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}
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}
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/**
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* s3c_pm_do_restore_core() - early restore register values from save list.
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* @ptr: Pointer to an array of registers.
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* @count: Size of the ptr array.
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*
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* This is similar to s3c_pm_do_restore() except we try and minimise the
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* side effects of the function in case registers that hardware might need
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* to work has been restored.
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*
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* WARNING: Do not put any debug in here that may effect memory or use
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* peripherals, as things may be changing!
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*/
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void s3c_pm_do_restore_core(const struct sleep_save *ptr, int count)
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{
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for (; count > 0; count--, ptr++)
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writel_relaxed(ptr->val, ptr->reg);
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}
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