mirror of
https://github.com/torvalds/linux.git
synced 2024-11-29 23:51:37 +00:00
ed4dba99ca
The Kconfig currently controlling compilation of this code is: drivers/reset/Kconfig:config RESET_BERLIN drivers/reset/Kconfig: bool "Berlin Reset Driver" if COMPILE_TEST drivers/reset/Kconfig: default ARCH_BERLIN or arch/arm/mach-berlin/Kconfig:menuconfig ARCH_BERLIN arch/arm/mach-berlin/Kconfig: bool "Marvell Berlin SoCs" if ARCH_MULTI_V7 or arch/arm64/Kconfig.platforms:config ARCH_BERLIN arch/arm64/Kconfig.platforms: bool "Marvell Berlin SoC Family" ...meaning that it currently is not being built as a module by anyone. Lets remove the modular code that is essentially orphaned, 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. Also note that MODULE_DEVICE_TABLE is a no-op for non-modular code. 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: Antoine Tenart <antoine.tenart@free-electrons.com> Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/*
|
|
* Copyright (C) 2014 Marvell Technology Group Ltd.
|
|
*
|
|
* Marvell Berlin reset driver
|
|
*
|
|
* Antoine Tenart <antoine.tenart@free-electrons.com>
|
|
* Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
|
|
*
|
|
* This file is licensed under the terms of the GNU General Public
|
|
* License version 2. This program is licensed "as is" without any
|
|
* warranty of any kind, whether express or implied.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/io.h>
|
|
#include <linux/mfd/syscon.h>
|
|
#include <linux/init.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/regmap.h>
|
|
#include <linux/reset-controller.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/types.h>
|
|
|
|
#define BERLIN_MAX_RESETS 32
|
|
|
|
#define to_berlin_reset_priv(p) \
|
|
container_of((p), struct berlin_reset_priv, rcdev)
|
|
|
|
struct berlin_reset_priv {
|
|
struct regmap *regmap;
|
|
struct reset_controller_dev rcdev;
|
|
};
|
|
|
|
static int berlin_reset_reset(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct berlin_reset_priv *priv = to_berlin_reset_priv(rcdev);
|
|
int offset = id >> 8;
|
|
int mask = BIT(id & 0x1f);
|
|
|
|
regmap_write(priv->regmap, offset, mask);
|
|
|
|
/* let the reset be effective */
|
|
udelay(10);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct reset_control_ops berlin_reset_ops = {
|
|
.reset = berlin_reset_reset,
|
|
};
|
|
|
|
static int berlin_reset_xlate(struct reset_controller_dev *rcdev,
|
|
const struct of_phandle_args *reset_spec)
|
|
{
|
|
unsigned offset, bit;
|
|
|
|
offset = reset_spec->args[0];
|
|
bit = reset_spec->args[1];
|
|
|
|
if (bit >= BERLIN_MAX_RESETS)
|
|
return -EINVAL;
|
|
|
|
return (offset << 8) | bit;
|
|
}
|
|
|
|
static int berlin2_reset_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *parent_np = of_get_parent(pdev->dev.of_node);
|
|
struct berlin_reset_priv *priv;
|
|
|
|
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->regmap = syscon_node_to_regmap(parent_np);
|
|
of_node_put(parent_np);
|
|
if (IS_ERR(priv->regmap))
|
|
return PTR_ERR(priv->regmap);
|
|
|
|
priv->rcdev.owner = THIS_MODULE;
|
|
priv->rcdev.ops = &berlin_reset_ops;
|
|
priv->rcdev.of_node = pdev->dev.of_node;
|
|
priv->rcdev.of_reset_n_cells = 2;
|
|
priv->rcdev.of_xlate = berlin_reset_xlate;
|
|
|
|
return reset_controller_register(&priv->rcdev);
|
|
}
|
|
|
|
static const struct of_device_id berlin_reset_dt_match[] = {
|
|
{ .compatible = "marvell,berlin2-reset" },
|
|
{ },
|
|
};
|
|
|
|
static struct platform_driver berlin_reset_driver = {
|
|
.probe = berlin2_reset_probe,
|
|
.driver = {
|
|
.name = "berlin2-reset",
|
|
.of_match_table = berlin_reset_dt_match,
|
|
},
|
|
};
|
|
builtin_platform_driver(berlin_reset_driver);
|