4 #if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND)
5 #define do_extend_cmdline 1
7 #define do_extend_cmdline 0
10 static int node_offset(void *fdt, const char *node_path)
12 int offset = fdt_path_offset(fdt, node_path);
13 if (offset == -FDT_ERR_NOTFOUND)
14 offset = fdt_add_subnode(fdt, 0, node_path);
18 static int setprop(void *fdt, const char *node_path, const char *property,
19 uint32_t *val_array, int size)
21 int offset = node_offset(fdt, node_path);
24 return fdt_setprop(fdt, offset, property, val_array, size);
27 static int setprop_string(void *fdt, const char *node_path,
28 const char *property, const char *string)
30 int offset = node_offset(fdt, node_path);
33 return fdt_setprop_string(fdt, offset, property, string);
36 static int setprop_cell(void *fdt, const char *node_path,
37 const char *property, uint32_t val)
39 int offset = node_offset(fdt, node_path);
42 return fdt_setprop_cell(fdt, offset, property, val);
45 static const void *getprop(const void *fdt, const char *node_path,
46 const char *property, int *len)
48 int offset = fdt_path_offset(fdt, node_path);
50 if (offset == -FDT_ERR_NOTFOUND)
53 return fdt_getprop(fdt, offset, property, len);
56 static uint32_t get_cell_size(const void *fdt)
59 uint32_t cell_size = 1;
60 const uint32_t *size_len = getprop(fdt, "/", "#size-cells", &len);
63 cell_size = fdt32_to_cpu(*size_len);
67 static void merge_fdt_bootargs(void *fdt, const char *fdt_cmdline)
69 char cmdline[COMMAND_LINE_SIZE];
70 const char *fdt_bootargs;
74 /* copy the fdt command line into the buffer */
75 fdt_bootargs = getprop(fdt, "/chosen", "bootargs", &len);
77 if (len < COMMAND_LINE_SIZE) {
78 memcpy(ptr, fdt_bootargs, len);
79 /* len is the length of the string
80 * including the NULL terminator */
84 /* and append the ATAG_CMDLINE */
86 len = strlen(fdt_cmdline);
87 if (ptr - cmdline + len + 2 < COMMAND_LINE_SIZE) {
89 memcpy(ptr, fdt_cmdline, len);
95 setprop_string(fdt, "/chosen", "bootargs", cmdline);
99 * Convert and fold provided ATAGs into the provided FDT.
102 * = 0 -> pretend success
103 * = 1 -> bad ATAG (may retry with another possible ATAG pointer)
104 * < 0 -> error from libfdt
106 int atags_to_fdt(void *atag_list, void *fdt, int total_space)
108 struct tag *atag = atag_list;
109 /* In the case of 64 bits memory size, need to reserve 2 cells for
110 * address and size for each bank */
111 uint32_t mem_reg_property[2 * 2 * NR_BANKS];
115 /* make sure we've got an aligned pointer */
116 if ((u32)atag_list & 0x3)
119 /* if we get a DTB here we're done already */
120 if (*(u32 *)atag_list == fdt32_to_cpu(FDT_MAGIC))
123 /* validate the ATAG */
124 if (atag->hdr.tag != ATAG_CORE ||
125 (atag->hdr.size != tag_size(tag_core) &&
126 atag->hdr.size != 2))
129 /* let's give it all the room it could need */
130 ret = fdt_open_into(fdt, fdt, total_space);
134 for_each_tag(atag, atag_list) {
135 if (atag->hdr.tag == ATAG_CMDLINE) {
136 /* Append the ATAGS command line to the device tree
138 * NB: This means that if the same parameter is set in
139 * the device tree and in the tags, the one from the
140 * tags will be chosen.
142 if (do_extend_cmdline)
143 merge_fdt_bootargs(fdt,
144 atag->u.cmdline.cmdline);
146 setprop_string(fdt, "/chosen", "bootargs",
147 atag->u.cmdline.cmdline);
148 } else if (atag->hdr.tag == ATAG_MEM) {
149 if (memcount >= sizeof(mem_reg_property)/4)
151 if (!atag->u.mem.size)
153 memsize = get_cell_size(fdt);
156 /* if memsize is 2, that means that
157 * each data needs 2 cells of 32 bits,
158 * so the data are 64 bits */
159 uint64_t *mem_reg_prop64 =
160 (uint64_t *)mem_reg_property;
161 mem_reg_prop64[memcount++] =
162 cpu_to_fdt64(atag->u.mem.start);
163 mem_reg_prop64[memcount++] =
164 cpu_to_fdt64(atag->u.mem.size);
166 mem_reg_property[memcount++] =
167 cpu_to_fdt32(atag->u.mem.start);
168 mem_reg_property[memcount++] =
169 cpu_to_fdt32(atag->u.mem.size);
172 } else if (atag->hdr.tag == ATAG_INITRD2) {
173 uint32_t initrd_start, initrd_size;
174 initrd_start = atag->u.initrd.start;
175 initrd_size = atag->u.initrd.size;
176 setprop_cell(fdt, "/chosen", "linux,initrd-start",
178 setprop_cell(fdt, "/chosen", "linux,initrd-end",
179 initrd_start + initrd_size);
184 setprop(fdt, "/memory", "reg", mem_reg_property,
185 4 * memcount * memsize);
188 return fdt_pack(fdt);