linux/drivers/reset/reset-oxnas.c
Thomas Gleixner 9952f6918d treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 201
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms and conditions of the gnu general public license
  version 2 as published by the free software foundation this program
  is distributed in the hope it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program if not see http www gnu org
  licenses

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 228 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Steve Winslow <swinslow@gmail.com>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190528171438.107155473@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:29:52 -07:00

115 lines
2.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* drivers/reset/reset-oxnas.c
*
* Copyright (C) 2016 Neil Armstrong <narmstrong@baylibre.com>
* Copyright (C) 2014 Ma Haijun <mahaijuns@gmail.com>
* Copyright (C) 2009 Oxford Semiconductor Ltd
*/
#include <linux/err.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
/* Regmap offsets */
#define RST_SET_REGOFFSET 0x34
#define RST_CLR_REGOFFSET 0x38
struct oxnas_reset {
struct regmap *regmap;
struct reset_controller_dev rcdev;
};
static int oxnas_reset_reset(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct oxnas_reset *data =
container_of(rcdev, struct oxnas_reset, rcdev);
regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id));
msleep(50);
regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id));
return 0;
}
static int oxnas_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct oxnas_reset *data =
container_of(rcdev, struct oxnas_reset, rcdev);
regmap_write(data->regmap, RST_SET_REGOFFSET, BIT(id));
return 0;
}
static int oxnas_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct oxnas_reset *data =
container_of(rcdev, struct oxnas_reset, rcdev);
regmap_write(data->regmap, RST_CLR_REGOFFSET, BIT(id));
return 0;
}
static const struct reset_control_ops oxnas_reset_ops = {
.reset = oxnas_reset_reset,
.assert = oxnas_reset_assert,
.deassert = oxnas_reset_deassert,
};
static const struct of_device_id oxnas_reset_dt_ids[] = {
{ .compatible = "oxsemi,ox810se-reset", },
{ .compatible = "oxsemi,ox820-reset", },
{ /* sentinel */ },
};
static int oxnas_reset_probe(struct platform_device *pdev)
{
struct oxnas_reset *data;
struct device *parent;
parent = pdev->dev.parent;
if (!parent) {
dev_err(&pdev->dev, "no parent\n");
return -ENODEV;
}
data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->regmap = syscon_node_to_regmap(parent->of_node);
if (IS_ERR(data->regmap)) {
dev_err(&pdev->dev, "failed to get parent regmap\n");
return PTR_ERR(data->regmap);
}
platform_set_drvdata(pdev, data);
data->rcdev.owner = THIS_MODULE;
data->rcdev.nr_resets = 32;
data->rcdev.ops = &oxnas_reset_ops;
data->rcdev.of_node = pdev->dev.of_node;
return devm_reset_controller_register(&pdev->dev, &data->rcdev);
}
static struct platform_driver oxnas_reset_driver = {
.probe = oxnas_reset_probe,
.driver = {
.name = "oxnas-reset",
.of_match_table = oxnas_reset_dt_ids,
},
};
builtin_platform_driver(oxnas_reset_driver);