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Based on 3 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 either version 2 of the license or at your option any later version 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 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 either version 2 of the license or at your option any later version [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 either version 2 of the license or at your option any later version [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* AR71xx Reset Controller Driver
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* Author: Alban Bedel
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*
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* Copyright (C) 2015 Alban Bedel <albeu@free.fr>
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*/
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#include <linux/io.h>
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#include <linux/init.h>
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#include <linux/mod_devicetable.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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#include <linux/reboot.h>
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struct ath79_reset {
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struct reset_controller_dev rcdev;
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struct notifier_block restart_nb;
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void __iomem *base;
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spinlock_t lock;
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};
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#define FULL_CHIP_RESET 24
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static int ath79_reset_update(struct reset_controller_dev *rcdev,
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unsigned long id, bool assert)
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{
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struct ath79_reset *ath79_reset =
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container_of(rcdev, struct ath79_reset, rcdev);
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unsigned long flags;
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u32 val;
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spin_lock_irqsave(&ath79_reset->lock, flags);
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val = readl(ath79_reset->base);
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if (assert)
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val |= BIT(id);
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else
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val &= ~BIT(id);
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writel(val, ath79_reset->base);
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spin_unlock_irqrestore(&ath79_reset->lock, flags);
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return 0;
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}
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static int ath79_reset_assert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return ath79_reset_update(rcdev, id, true);
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}
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static int ath79_reset_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return ath79_reset_update(rcdev, id, false);
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}
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static int ath79_reset_status(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct ath79_reset *ath79_reset =
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container_of(rcdev, struct ath79_reset, rcdev);
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u32 val;
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val = readl(ath79_reset->base);
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return !!(val & BIT(id));
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}
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static const struct reset_control_ops ath79_reset_ops = {
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.assert = ath79_reset_assert,
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.deassert = ath79_reset_deassert,
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.status = ath79_reset_status,
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};
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static int ath79_reset_restart_handler(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct ath79_reset *ath79_reset =
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container_of(nb, struct ath79_reset, restart_nb);
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ath79_reset_assert(&ath79_reset->rcdev, FULL_CHIP_RESET);
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return NOTIFY_DONE;
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}
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static int ath79_reset_probe(struct platform_device *pdev)
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{
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struct ath79_reset *ath79_reset;
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struct resource *res;
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int err;
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ath79_reset = devm_kzalloc(&pdev->dev,
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sizeof(*ath79_reset), GFP_KERNEL);
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if (!ath79_reset)
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return -ENOMEM;
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platform_set_drvdata(pdev, ath79_reset);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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ath79_reset->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(ath79_reset->base))
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return PTR_ERR(ath79_reset->base);
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spin_lock_init(&ath79_reset->lock);
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ath79_reset->rcdev.ops = &ath79_reset_ops;
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ath79_reset->rcdev.owner = THIS_MODULE;
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ath79_reset->rcdev.of_node = pdev->dev.of_node;
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ath79_reset->rcdev.of_reset_n_cells = 1;
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ath79_reset->rcdev.nr_resets = 32;
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err = devm_reset_controller_register(&pdev->dev, &ath79_reset->rcdev);
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if (err)
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return err;
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ath79_reset->restart_nb.notifier_call = ath79_reset_restart_handler;
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ath79_reset->restart_nb.priority = 128;
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err = register_restart_handler(&ath79_reset->restart_nb);
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if (err)
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dev_warn(&pdev->dev, "Failed to register restart handler\n");
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return 0;
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}
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static const struct of_device_id ath79_reset_dt_ids[] = {
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{ .compatible = "qca,ar7100-reset", },
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{ },
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};
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static struct platform_driver ath79_reset_driver = {
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.probe = ath79_reset_probe,
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.driver = {
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.name = "ath79-reset",
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.of_match_table = ath79_reset_dt_ids,
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.suppress_bind_attrs = true,
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},
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};
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builtin_platform_driver(ath79_reset_driver);
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