mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-22 10:31:08 +00:00
5eddff6add
This function call was found to be unnecessary as there is no equivalent platform_get_drvdata() call to access the private data of the driver. Also, the private data is defined in this driver, so there is no risk of it being accessed outside of this driver file. Reviewed-by: Alexandru Ardelean <alex@shruggie.ro> Signed-off-by: Andrei Coardos <aboutphysycs@gmail.com> Link: https://lore.kernel.org/r/20230803104102.29647-1-aboutphysycs@gmail.com Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
134 lines
3.2 KiB
C
134 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* AR71xx Reset Controller Driver
|
|
* Author: Alban Bedel
|
|
*
|
|
* Copyright (C) 2015 Alban Bedel <albeu@free.fr>
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reset-controller.h>
|
|
#include <linux/reboot.h>
|
|
|
|
struct ath79_reset {
|
|
struct reset_controller_dev rcdev;
|
|
struct notifier_block restart_nb;
|
|
void __iomem *base;
|
|
spinlock_t lock;
|
|
};
|
|
|
|
#define FULL_CHIP_RESET 24
|
|
|
|
static int ath79_reset_update(struct reset_controller_dev *rcdev,
|
|
unsigned long id, bool assert)
|
|
{
|
|
struct ath79_reset *ath79_reset =
|
|
container_of(rcdev, struct ath79_reset, rcdev);
|
|
unsigned long flags;
|
|
u32 val;
|
|
|
|
spin_lock_irqsave(&ath79_reset->lock, flags);
|
|
val = readl(ath79_reset->base);
|
|
if (assert)
|
|
val |= BIT(id);
|
|
else
|
|
val &= ~BIT(id);
|
|
writel(val, ath79_reset->base);
|
|
spin_unlock_irqrestore(&ath79_reset->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ath79_reset_assert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
return ath79_reset_update(rcdev, id, true);
|
|
}
|
|
|
|
static int ath79_reset_deassert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
return ath79_reset_update(rcdev, id, false);
|
|
}
|
|
|
|
static int ath79_reset_status(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct ath79_reset *ath79_reset =
|
|
container_of(rcdev, struct ath79_reset, rcdev);
|
|
u32 val;
|
|
|
|
val = readl(ath79_reset->base);
|
|
|
|
return !!(val & BIT(id));
|
|
}
|
|
|
|
static const struct reset_control_ops ath79_reset_ops = {
|
|
.assert = ath79_reset_assert,
|
|
.deassert = ath79_reset_deassert,
|
|
.status = ath79_reset_status,
|
|
};
|
|
|
|
static int ath79_reset_restart_handler(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct ath79_reset *ath79_reset =
|
|
container_of(nb, struct ath79_reset, restart_nb);
|
|
|
|
ath79_reset_assert(&ath79_reset->rcdev, FULL_CHIP_RESET);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static int ath79_reset_probe(struct platform_device *pdev)
|
|
{
|
|
struct ath79_reset *ath79_reset;
|
|
int err;
|
|
|
|
ath79_reset = devm_kzalloc(&pdev->dev,
|
|
sizeof(*ath79_reset), GFP_KERNEL);
|
|
if (!ath79_reset)
|
|
return -ENOMEM;
|
|
|
|
ath79_reset->base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(ath79_reset->base))
|
|
return PTR_ERR(ath79_reset->base);
|
|
|
|
spin_lock_init(&ath79_reset->lock);
|
|
ath79_reset->rcdev.ops = &ath79_reset_ops;
|
|
ath79_reset->rcdev.owner = THIS_MODULE;
|
|
ath79_reset->rcdev.of_node = pdev->dev.of_node;
|
|
ath79_reset->rcdev.of_reset_n_cells = 1;
|
|
ath79_reset->rcdev.nr_resets = 32;
|
|
|
|
err = devm_reset_controller_register(&pdev->dev, &ath79_reset->rcdev);
|
|
if (err)
|
|
return err;
|
|
|
|
ath79_reset->restart_nb.notifier_call = ath79_reset_restart_handler;
|
|
ath79_reset->restart_nb.priority = 128;
|
|
|
|
err = register_restart_handler(&ath79_reset->restart_nb);
|
|
if (err)
|
|
dev_warn(&pdev->dev, "Failed to register restart handler\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id ath79_reset_dt_ids[] = {
|
|
{ .compatible = "qca,ar7100-reset", },
|
|
{ },
|
|
};
|
|
|
|
static struct platform_driver ath79_reset_driver = {
|
|
.probe = ath79_reset_probe,
|
|
.driver = {
|
|
.name = "ath79-reset",
|
|
.of_match_table = ath79_reset_dt_ids,
|
|
.suppress_bind_attrs = true,
|
|
},
|
|
};
|
|
builtin_platform_driver(ath79_reset_driver);
|