1*c9d6d52bSAlexander von Gluck IV // SPDX-License-Identifier: (GPL-2.0-or-later OR BSD-2-Clause)
2*c9d6d52bSAlexander von Gluck IV /*
3*c9d6d52bSAlexander von Gluck IV * libfdt - Flat Device Tree manipulation
4*c9d6d52bSAlexander von Gluck IV * Copyright (C) 2014 David Gibson <david@gibson.dropbear.id.au>
5*c9d6d52bSAlexander von Gluck IV * Copyright (C) 2018 embedded brains GmbH
6*c9d6d52bSAlexander von Gluck IV */
7*c9d6d52bSAlexander von Gluck IV #include "libfdt_env.h"
8*c9d6d52bSAlexander von Gluck IV
9*c9d6d52bSAlexander von Gluck IV #include <fdt.h>
10*c9d6d52bSAlexander von Gluck IV #include <libfdt.h>
11*c9d6d52bSAlexander von Gluck IV
12*c9d6d52bSAlexander von Gluck IV #include "libfdt_internal.h"
13*c9d6d52bSAlexander von Gluck IV
fdt_cells(const void * fdt,int nodeoffset,const char * name)14*c9d6d52bSAlexander von Gluck IV static int fdt_cells(const void *fdt, int nodeoffset, const char *name)
15*c9d6d52bSAlexander von Gluck IV {
16*c9d6d52bSAlexander von Gluck IV const fdt32_t *c;
17*c9d6d52bSAlexander von Gluck IV uint32_t val;
18*c9d6d52bSAlexander von Gluck IV int len;
19*c9d6d52bSAlexander von Gluck IV
20*c9d6d52bSAlexander von Gluck IV c = fdt_getprop(fdt, nodeoffset, name, &len);
21*c9d6d52bSAlexander von Gluck IV if (!c)
22*c9d6d52bSAlexander von Gluck IV return len;
23*c9d6d52bSAlexander von Gluck IV
24*c9d6d52bSAlexander von Gluck IV if (len != sizeof(*c))
25*c9d6d52bSAlexander von Gluck IV return -FDT_ERR_BADNCELLS;
26*c9d6d52bSAlexander von Gluck IV
27*c9d6d52bSAlexander von Gluck IV val = fdt32_to_cpu(*c);
28*c9d6d52bSAlexander von Gluck IV if (val > FDT_MAX_NCELLS)
29*c9d6d52bSAlexander von Gluck IV return -FDT_ERR_BADNCELLS;
30*c9d6d52bSAlexander von Gluck IV
31*c9d6d52bSAlexander von Gluck IV return (int)val;
32*c9d6d52bSAlexander von Gluck IV }
33*c9d6d52bSAlexander von Gluck IV
fdt_address_cells(const void * fdt,int nodeoffset)34*c9d6d52bSAlexander von Gluck IV int fdt_address_cells(const void *fdt, int nodeoffset)
35*c9d6d52bSAlexander von Gluck IV {
36*c9d6d52bSAlexander von Gluck IV int val;
37*c9d6d52bSAlexander von Gluck IV
38*c9d6d52bSAlexander von Gluck IV val = fdt_cells(fdt, nodeoffset, "#address-cells");
39*c9d6d52bSAlexander von Gluck IV if (val == 0)
40*c9d6d52bSAlexander von Gluck IV return -FDT_ERR_BADNCELLS;
41*c9d6d52bSAlexander von Gluck IV if (val == -FDT_ERR_NOTFOUND)
42*c9d6d52bSAlexander von Gluck IV return 2;
43*c9d6d52bSAlexander von Gluck IV return val;
44*c9d6d52bSAlexander von Gluck IV }
45*c9d6d52bSAlexander von Gluck IV
fdt_size_cells(const void * fdt,int nodeoffset)46*c9d6d52bSAlexander von Gluck IV int fdt_size_cells(const void *fdt, int nodeoffset)
47*c9d6d52bSAlexander von Gluck IV {
48*c9d6d52bSAlexander von Gluck IV int val;
49*c9d6d52bSAlexander von Gluck IV
50*c9d6d52bSAlexander von Gluck IV val = fdt_cells(fdt, nodeoffset, "#size-cells");
51*c9d6d52bSAlexander von Gluck IV if (val == -FDT_ERR_NOTFOUND)
52*c9d6d52bSAlexander von Gluck IV return 1;
53*c9d6d52bSAlexander von Gluck IV return val;
54*c9d6d52bSAlexander von Gluck IV }
55*c9d6d52bSAlexander von Gluck IV
56*c9d6d52bSAlexander von Gluck IV /* 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)57*c9d6d52bSAlexander von Gluck IV int fdt_appendprop_addrrange(void *fdt, int parent, int nodeoffset,
58*c9d6d52bSAlexander von Gluck IV const char *name, uint64_t addr, uint64_t size)
59*c9d6d52bSAlexander von Gluck IV {
60*c9d6d52bSAlexander von Gluck IV int addr_cells, size_cells, ret;
61*c9d6d52bSAlexander von Gluck IV uint8_t data[sizeof(fdt64_t) * 2], *prop;
62*c9d6d52bSAlexander von Gluck IV
63*c9d6d52bSAlexander von Gluck IV ret = fdt_address_cells(fdt, parent);
64*c9d6d52bSAlexander von Gluck IV if (ret < 0)
65*c9d6d52bSAlexander von Gluck IV return ret;
66*c9d6d52bSAlexander von Gluck IV addr_cells = ret;
67*c9d6d52bSAlexander von Gluck IV
68*c9d6d52bSAlexander von Gluck IV ret = fdt_size_cells(fdt, parent);
69*c9d6d52bSAlexander von Gluck IV if (ret < 0)
70*c9d6d52bSAlexander von Gluck IV return ret;
71*c9d6d52bSAlexander von Gluck IV size_cells = ret;
72*c9d6d52bSAlexander von Gluck IV
73*c9d6d52bSAlexander von Gluck IV /* check validity of address */
74*c9d6d52bSAlexander von Gluck IV prop = data;
75*c9d6d52bSAlexander von Gluck IV if (addr_cells == 1) {
76*c9d6d52bSAlexander von Gluck IV if ((addr > UINT32_MAX) || ((UINT32_MAX + 1 - addr) < size))
77*c9d6d52bSAlexander von Gluck IV return -FDT_ERR_BADVALUE;
78*c9d6d52bSAlexander von Gluck IV
79*c9d6d52bSAlexander von Gluck IV fdt32_st(prop, (uint32_t)addr);
80*c9d6d52bSAlexander von Gluck IV } else if (addr_cells == 2) {
81*c9d6d52bSAlexander von Gluck IV fdt64_st(prop, addr);
82*c9d6d52bSAlexander von Gluck IV } else {
83*c9d6d52bSAlexander von Gluck IV return -FDT_ERR_BADNCELLS;
84*c9d6d52bSAlexander von Gluck IV }
85*c9d6d52bSAlexander von Gluck IV
86*c9d6d52bSAlexander von Gluck IV /* check validity of size */
87*c9d6d52bSAlexander von Gluck IV prop += addr_cells * sizeof(fdt32_t);
88*c9d6d52bSAlexander von Gluck IV if (size_cells == 1) {
89*c9d6d52bSAlexander von Gluck IV if (size > UINT32_MAX)
90*c9d6d52bSAlexander von Gluck IV return -FDT_ERR_BADVALUE;
91*c9d6d52bSAlexander von Gluck IV
92*c9d6d52bSAlexander von Gluck IV fdt32_st(prop, (uint32_t)size);
93*c9d6d52bSAlexander von Gluck IV } else if (size_cells == 2) {
94*c9d6d52bSAlexander von Gluck IV fdt64_st(prop, size);
95*c9d6d52bSAlexander von Gluck IV } else {
96*c9d6d52bSAlexander von Gluck IV return -FDT_ERR_BADNCELLS;
97*c9d6d52bSAlexander von Gluck IV }
98*c9d6d52bSAlexander von Gluck IV
99*c9d6d52bSAlexander von Gluck IV return fdt_appendprop(fdt, nodeoffset, name, data,
100*c9d6d52bSAlexander von Gluck IV (addr_cells + size_cells) * sizeof(fdt32_t));
101*c9d6d52bSAlexander von Gluck IV }
102