e13c205ac3
Use the newly created copies in the reset-simple driver to replace the sunxi platform driver code and reset operations. The separate sunxi driver still remains to register the early reset controllers, but it reuses the reset operations in reset-simple. Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de> Reviewed-by: Alexandru Gagniuc <alex.g@adaptrum.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org>
88 lines
2 KiB
C
88 lines
2 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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/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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