4 #if defined(CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND)
5 #define do_extend_cmdline 1
7 #define do_extend_cmdline 0
12 static int node_offset(void *fdt, const char *node_path)
14 int offset = fdt_path_offset(fdt, node_path);
15 if (offset == -FDT_ERR_NOTFOUND)
16 offset = fdt_add_subnode(fdt, 0, node_path);
20 static int setprop(void *fdt, const char *node_path, const char *property,
21 uint32_t *val_array, int size)
23 int offset = node_offset(fdt, node_path);
26 return fdt_setprop(fdt, offset, property, val_array, size);
29 static int setprop_string(void *fdt, const char *node_path,
30 const char *property, const char *string)
32 int offset = node_offset(fdt, node_path);
35 return fdt_setprop_string(fdt, offset, property, string);
38 static int setprop_cell(void *fdt, const char *node_path,
39 const char *property, uint32_t val)
41 int offset = node_offset(fdt, node_path);
44 return fdt_setprop_cell(fdt, offset, property, val);
47 static const void *getprop(const void *fdt, const char *node_path,
48 const char *property, int *len)
50 int offset = fdt_path_offset(fdt, node_path);
52 if (offset == -FDT_ERR_NOTFOUND)
55 return fdt_getprop(fdt, offset, property, len);
58 static uint32_t get_cell_size(const void *fdt)
61 uint32_t cell_size = 1;
62 const uint32_t *size_len = getprop(fdt, "/", "#size-cells", &len);
65 cell_size = fdt32_to_cpu(*size_len);
69 static void merge_fdt_bootargs(void *fdt, const char *fdt_cmdline)
71 char cmdline[COMMAND_LINE_SIZE];
72 const char *fdt_bootargs;
76 /* copy the fdt command line into the buffer */
77 fdt_bootargs = getprop(fdt, "/chosen", "bootargs", &len);
79 if (len < COMMAND_LINE_SIZE) {
80 memcpy(ptr, fdt_bootargs, len);
81 /* len is the length of the string
82 * including the NULL terminator */
86 /* and append the ATAG_CMDLINE */
88 len = strlen(fdt_cmdline);
89 if (ptr - cmdline + len + 2 < COMMAND_LINE_SIZE) {
91 memcpy(ptr, fdt_cmdline, len);
97 setprop_string(fdt, "/chosen", "bootargs", cmdline);
101 * Convert and fold provided ATAGs into the provided FDT.
104 * = 0 -> pretend success
105 * = 1 -> bad ATAG (may retry with another possible ATAG pointer)
106 * < 0 -> error from libfdt
108 int atags_to_fdt(void *atag_list, void *fdt, int total_space)
110 struct tag *atag = atag_list;
111 /* In the case of 64 bits memory size, need to reserve 2 cells for
112 * address and size for each bank */
113 uint32_t mem_reg_property[2 * 2 * NR_BANKS];
117 /* make sure we've got an aligned pointer */
118 if ((u32)atag_list & 0x3)
121 /* if we get a DTB here we're done already */
122 if (*(u32 *)atag_list == fdt32_to_cpu(FDT_MAGIC))
125 /* validate the ATAG */
126 if (atag->hdr.tag != ATAG_CORE ||
127 (atag->hdr.size != tag_size(tag_core) &&
128 atag->hdr.size != 2))
131 /* let's give it all the room it could need */
132 ret = fdt_open_into(fdt, fdt, total_space);
136 for_each_tag(atag, atag_list) {
137 if (atag->hdr.tag == ATAG_CMDLINE) {
138 /* Append the ATAGS command line to the device tree
140 * NB: This means that if the same parameter is set in
141 * the device tree and in the tags, the one from the
142 * tags will be chosen.
144 if (do_extend_cmdline)
145 merge_fdt_bootargs(fdt,
146 atag->u.cmdline.cmdline);
148 setprop_string(fdt, "/chosen", "bootargs",
149 atag->u.cmdline.cmdline);
150 } else if (atag->hdr.tag == ATAG_MEM) {
151 if (memcount >= sizeof(mem_reg_property)/4)
153 if (!atag->u.mem.size)
155 memsize = get_cell_size(fdt);
158 /* if memsize is 2, that means that
159 * each data needs 2 cells of 32 bits,
160 * so the data are 64 bits */
161 uint64_t *mem_reg_prop64 =
162 (uint64_t *)mem_reg_property;
163 mem_reg_prop64[memcount++] =
164 cpu_to_fdt64(atag->u.mem.start);
165 mem_reg_prop64[memcount++] =
166 cpu_to_fdt64(atag->u.mem.size);
168 mem_reg_property[memcount++] =
169 cpu_to_fdt32(atag->u.mem.start);
170 mem_reg_property[memcount++] =
171 cpu_to_fdt32(atag->u.mem.size);
174 } else if (atag->hdr.tag == ATAG_INITRD2) {
175 uint32_t initrd_start, initrd_size;
176 initrd_start = atag->u.initrd.start;
177 initrd_size = atag->u.initrd.size;
178 setprop_cell(fdt, "/chosen", "linux,initrd-start",
180 setprop_cell(fdt, "/chosen", "linux,initrd-end",
181 initrd_start + initrd_size);
186 setprop(fdt, "/memory", "reg", mem_reg_property,
187 4 * memcount * memsize);
190 return fdt_pack(fdt);