Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * (c) Copyright 2006 Benjamin Herrenschmidt, IBM Corp.
4 * <benh@kernel.crashing.org>
5 */
6
7#undef DEBUG
8
9#include <linux/kernel.h>
10#include <linux/export.h>
11#include <linux/of_address.h>
12#include <asm/dcr.h>
13
14unsigned int dcr_resource_start(const struct device_node *np,
15 unsigned int index)
16{
17 unsigned int ds;
18 const u32 *dr = of_get_property(np, "dcr-reg", &ds);
19
20 if (dr == NULL || ds & 1 || index >= (ds / 8))
21 return 0;
22
23 return dr[index * 2];
24}
25EXPORT_SYMBOL_GPL(dcr_resource_start);
26
27unsigned int dcr_resource_len(const struct device_node *np, unsigned int index)
28{
29 unsigned int ds;
30 const u32 *dr = of_get_property(np, "dcr-reg", &ds);
31
32 if (dr == NULL || ds & 1 || index >= (ds / 8))
33 return 0;
34
35 return dr[index * 2 + 1];
36}
37EXPORT_SYMBOL_GPL(dcr_resource_len);
38
39DEFINE_SPINLOCK(dcr_ind_lock);
40EXPORT_SYMBOL_GPL(dcr_ind_lock);