linux/arch/arm/mach-s3c/pm-common.c
Arnd Bergmann c6ff132d42 ARM: s3c: make headers local if possible
A lot of header files are only used internally now, so they can be moved
to mach-s3c, out of the visibility of drivers.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20200806182059.2431-40-krzk@kernel.org
[krzk: Rebase and fixup leds-s3c24xx driver]
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
2020-08-22 13:02:02 +02:00

74 lines
2.1 KiB
C

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