1/*	$NetBSD: fdt_addresses.c,v 1.1.1.3 2019/12/22 12:30:37 skrll Exp $	*/
2
3// SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
4/*
5 * libfdt - Flat Device Tree manipulation
6 * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
7 * Copyright (C) 2018 embedded brains GmbH
8 */
9#include "libfdt_env.h"
10
11#include <fdt.h>
12#include <libfdt.h>
13
14#include "libfdt_internal.h"
15
16static int fdt_cells(const void *fdt, int nodeoffset, const char *name)
17{
18	const fdt32_t *c;
19	uint32_t val;
20	int len;
21
22	c = fdt_getprop(fdt, nodeoffset, name, &len);
23	if (!c)
24		return len;
25
26	if (len != sizeof(*c))
27		return -FDT_ERR_BADNCELLS;
28
29	val = fdt32_to_cpu(*c);
30	if (val > FDT_MAX_NCELLS)
31		return -FDT_ERR_BADNCELLS;
32
33	return (int)val;
34}
35
36int fdt_address_cells(const void *fdt, int nodeoffset)
37{
38	int val;
39
40	val = fdt_cells(fdt, nodeoffset, "#address-cells");
41	if (val == 0)
42		return -FDT_ERR_BADNCELLS;
43	if (val == -FDT_ERR_NOTFOUND)
44		return 2;
45	return val;
46}
47
48int fdt_size_cells(const void *fdt, int nodeoffset)
49{
50	int val;
51
52	val = fdt_cells(fdt, nodeoffset, "#size-cells");
53	if (val == -FDT_ERR_NOTFOUND)
54		return 1;
55	return val;
56}
57
58/* This function assumes that [address|size]_cells is 1 or 2 */
59int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
60			     const char *name, uint64_t addr, uint64_t size)
61{
62	int addr_cells, size_cells, ret;
63	uint8_t data[sizeof(fdt64_t) * 2], *prop;
64
65	ret = fdt_address_cells(fdt, parent);
66	if (ret < 0)
67		return ret;
68	addr_cells = ret;
69
70	ret = fdt_size_cells(fdt, parent);
71	if (ret < 0)
72		return ret;
73	size_cells = ret;
74
75	/* check validity of address */
76	prop = data;
77	if (addr_cells == 1) {
78		if ((addr > UINT32_MAX) || ((UINT32_MAX + 1 - addr) < size))
79			return -FDT_ERR_BADVALUE;
80
81		fdt32_st(prop, (uint32_t)addr);
82	} else if (addr_cells == 2) {
83		fdt64_st(prop, addr);
84	} else {
85		return -FDT_ERR_BADNCELLS;
86	}
87
88	/* check validity of size */
89	prop += addr_cells * sizeof(fdt32_t);
90	if (size_cells == 1) {
91		if (size > UINT32_MAX)
92			return -FDT_ERR_BADVALUE;
93
94		fdt32_st(prop, (uint32_t)size);
95	} else if (size_cells == 2) {
96		fdt64_st(prop, size);
97	} else {
98		return -FDT_ERR_BADNCELLS;
99	}
100
101	return fdt_appendprop(fdt, nodeoffset, name, data,
102			      (addr_cells + size_cells) * sizeof(fdt32_t));
103}
104