2874c5fd28
Based on 1 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Allwinner SoCs Reset Controller driver
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*
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* Copyright 2013 Maxime Ripard
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*
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/of_address.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/reset/sunxi.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include "reset-simple.h"
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static int sunxi_reset_init(struct device_node *np)
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{
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struct reset_simple_data *data;
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struct resource res;
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resource_size_t size;
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int ret;
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data = kzalloc(sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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ret = of_address_to_resource(np, 0, &res);
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if (ret)
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goto err_alloc;
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size = resource_size(&res);
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if (!request_mem_region(res.start, size, np->name)) {
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ret = -EBUSY;
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goto err_alloc;
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}
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data->membase = ioremap(res.start, size);
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if (!data->membase) {
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ret = -ENOMEM;
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goto err_alloc;
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}
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spin_lock_init(&data->lock);
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data->rcdev.owner = THIS_MODULE;
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data->rcdev.nr_resets = size * 8;
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data->rcdev.ops = &reset_simple_ops;
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data->rcdev.of_node = np;
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data->active_low = true;
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return reset_controller_register(&data->rcdev);
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err_alloc:
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kfree(data);
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return ret;
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};
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/*
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* These are the reset controller we need to initialize early on in
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* our system, before we can even think of using a regular device
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* driver for it.
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* The controllers that we can register through the regular device
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* model are handled by the simple reset driver directly.
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*/
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static const struct of_device_id sunxi_early_reset_dt_ids[] __initconst = {
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{ .compatible = "allwinner,sun6i-a31-ahb1-reset", },
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{ /* sentinel */ },
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};
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void __init sun6i_reset_init(void)
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{
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struct device_node *np;
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for_each_matching_node(np, sunxi_early_reset_dt_ids)
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sunxi_reset_init(np);
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}
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