kernel-ark/drivers/reset/reset-zynq.c
Paul Gortmaker fadb03cd46 reset: zynq: make it explicitly non-modular
The Makefile/Kconfig currently controlling compilation of this code is:

drivers/reset/Kconfig:config RESET_ZYNQ
drivers/reset/Kconfig:  bool "ZYNQ Reset Driver" if COMPILE_TEST
drivers/reset/Kconfig:  default ARCH_ZYNQ

or

drivers/reset/Makefile:obj-$(CONFIG_ARCH_ZYNQ) += reset-zynq.o
arch/arm/mach-zynq/Kconfig:config ARCH_ZYNQ
arch/arm/mach-zynq/Kconfig:     bool "Xilinx Zynq ARM Cortex A9 Platform" if ARCH_MULTI_V7

...meaning that it currently is not being built as a module by anyone.

Lets remove the few remaining traces of modular macro usage, so that
when reading the driver there is no doubt it is builtin-only.

Since module_platform_driver() uses the same init level priority as
builtin_platform_driver() the init ordering remains unchanged with
this commit.

We also delete the MODULE_LICENSE tag etc. since all that information
was (or is now) contained at the top of the file in the comments.

Cc: "Sören Brinkmann" <soren.brinkmann@xilinx.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
2016-10-24 10:45:32 +02:00

143 lines
3.6 KiB
C

/*
* Copyright (c) 2015, National Instruments Corp.
*
* Xilinx Zynq Reset controller driver
*
* Author: Moritz Fischer <moritz.fischer@ettus.com>
*
* 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.
*/
#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);