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
fdt_cells(const void * fdt,int nodeoffset,const char * name)16 static 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
fdt_address_cells(const void * fdt,int nodeoffset)36 int 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
fdt_size_cells(const void * fdt,int nodeoffset)48 int 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 */
fdt_appendprop_addrrange(void * fdt,int parent,int nodeoffset,const char * name,uint64_t addr,uint64_t size)59 int 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