linux-stable/drivers/reset/reset-zynq.c
Thomas Gleixner 8e8e69d67e treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 285
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation version 2 of the license this program
  is distributed in the hope that 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 100 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141900.918357685@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:36:37 +02:00

134 lines
3.2 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015, National Instruments Corp.
*
* Xilinx Zynq Reset controller driver
*
* Author: Moritz Fischer <moritz.fischer@ettus.com>
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/mfd/syscon.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/regmap.h>
#include <linux/types.h>
struct zynq_reset_data {
struct regmap *slcr;
struct reset_controller_dev rcdev;
u32 offset;
};
#define to_zynq_reset_data(p) \
container_of((p), struct zynq_reset_data, rcdev)
static int zynq_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct zynq_reset_data *priv = to_zynq_reset_data(rcdev);
int bank = id / BITS_PER_LONG;
int offset = id % BITS_PER_LONG;
pr_debug("%s: %s reset bank %u offset %u\n", KBUILD_MODNAME, __func__,
bank, offset);
return regmap_update_bits(priv->slcr,
priv->offset + (bank * 4),
BIT(offset),
BIT(offset));
}
static int zynq_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct zynq_reset_data *priv = to_zynq_reset_data(rcdev);
int bank = id / BITS_PER_LONG;
int offset = id % BITS_PER_LONG;
pr_debug("%s: %s reset bank %u offset %u\n", KBUILD_MODNAME, __func__,
bank, offset);
return regmap_update_bits(priv->slcr,
priv->offset + (bank * 4),
BIT(offset),
~BIT(offset));
}
static int zynq_reset_status(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct zynq_reset_data *priv = to_zynq_reset_data(rcdev);
int bank = id / BITS_PER_LONG;
int offset = id % BITS_PER_LONG;
int ret;
u32 reg;
pr_debug("%s: %s reset bank %u offset %u\n", KBUILD_MODNAME, __func__,
bank, offset);
ret = regmap_read(priv->slcr, priv->offset + (bank * 4), &reg);
if (ret)
return ret;
return !!(reg & BIT(offset));
}
static const struct reset_control_ops zynq_reset_ops = {
.assert = zynq_reset_assert,
.deassert = zynq_reset_deassert,
.status = zynq_reset_status,
};
static int zynq_reset_probe(struct platform_device *pdev)
{
struct resource *res;
struct zynq_reset_data *priv;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
priv->slcr = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
"syscon");
if (IS_ERR(priv->slcr)) {
dev_err(&pdev->dev, "unable to get zynq-slcr regmap");
return PTR_ERR(priv->slcr);
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "missing IO resource\n");
return -ENODEV;
}
priv->offset = res->start;
priv->rcdev.owner = THIS_MODULE;
priv->rcdev.nr_resets = resource_size(res) / 4 * BITS_PER_LONG;
priv->rcdev.ops = &zynq_reset_ops;
priv->rcdev.of_node = pdev->dev.of_node;
return devm_reset_controller_register(&pdev->dev, &priv->rcdev);
}
static const struct of_device_id zynq_reset_dt_ids[] = {
{ .compatible = "xlnx,zynq-reset", },
{ /* sentinel */ },
};
static struct platform_driver zynq_reset_driver = {
.probe = zynq_reset_probe,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = zynq_reset_dt_ids,
},
};
builtin_platform_driver(zynq_reset_driver);