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// 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);
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