| Nicolas Pitre | b90b9a3 | 2011-09-13 22:37:07 -0400 | [diff] [blame] | 1 | #include <asm/setup.h> |
| 2 | #include <libfdt.h> |
| 3 | |
| 4 | static int node_offset(void *fdt, const char *node_path) |
| 5 | { |
| 6 | int offset = fdt_path_offset(fdt, node_path); |
| 7 | if (offset == -FDT_ERR_NOTFOUND) |
| 8 | offset = fdt_add_subnode(fdt, 0, node_path); |
| 9 | return offset; |
| 10 | } |
| 11 | |
| 12 | static int setprop(void *fdt, const char *node_path, const char *property, |
| 13 | uint32_t *val_array, int size) |
| 14 | { |
| 15 | int offset = node_offset(fdt, node_path); |
| 16 | if (offset < 0) |
| 17 | return offset; |
| 18 | return fdt_setprop(fdt, offset, property, val_array, size); |
| 19 | } |
| 20 | |
| 21 | static int setprop_string(void *fdt, const char *node_path, |
| 22 | const char *property, const char *string) |
| 23 | { |
| 24 | int offset = node_offset(fdt, node_path); |
| 25 | if (offset < 0) |
| 26 | return offset; |
| 27 | return fdt_setprop_string(fdt, offset, property, string); |
| 28 | } |
| 29 | |
| 30 | static int setprop_cell(void *fdt, const char *node_path, |
| 31 | const char *property, uint32_t val) |
| 32 | { |
| 33 | int offset = node_offset(fdt, node_path); |
| 34 | if (offset < 0) |
| 35 | return offset; |
| 36 | return fdt_setprop_cell(fdt, offset, property, val); |
| 37 | } |
| 38 | |
| 39 | /* |
| 40 | * Convert and fold provided ATAGs into the provided FDT. |
| 41 | * |
| 42 | * REturn values: |
| 43 | * = 0 -> pretend success |
| 44 | * = 1 -> bad ATAG (may retry with another possible ATAG pointer) |
| 45 | * < 0 -> error from libfdt |
| 46 | */ |
| 47 | int atags_to_fdt(void *atag_list, void *fdt, int total_space) |
| 48 | { |
| 49 | struct tag *atag = atag_list; |
| 50 | uint32_t mem_reg_property[2 * NR_BANKS]; |
| 51 | int memcount = 0; |
| 52 | int ret; |
| 53 | |
| 54 | /* make sure we've got an aligned pointer */ |
| 55 | if ((u32)atag_list & 0x3) |
| 56 | return 1; |
| 57 | |
| 58 | /* if we get a DTB here we're done already */ |
| 59 | if (*(u32 *)atag_list == fdt32_to_cpu(FDT_MAGIC)) |
| 60 | return 0; |
| 61 | |
| 62 | /* validate the ATAG */ |
| 63 | if (atag->hdr.tag != ATAG_CORE || |
| 64 | (atag->hdr.size != tag_size(tag_core) && |
| 65 | atag->hdr.size != 2)) |
| 66 | return 1; |
| 67 | |
| 68 | /* let's give it all the room it could need */ |
| 69 | ret = fdt_open_into(fdt, fdt, total_space); |
| 70 | if (ret < 0) |
| 71 | return ret; |
| 72 | |
| 73 | for_each_tag(atag, atag_list) { |
| 74 | if (atag->hdr.tag == ATAG_CMDLINE) { |
| 75 | setprop_string(fdt, "/chosen", "bootargs", |
| 76 | atag->u.cmdline.cmdline); |
| 77 | } else if (atag->hdr.tag == ATAG_MEM) { |
| 78 | if (memcount >= sizeof(mem_reg_property)/4) |
| 79 | continue; |
| Marc Zyngier | a106b21 | 2012-04-11 14:52:56 +0100 | [diff] [blame] | 80 | if (!atag->u.mem.size) |
| 81 | continue; |
| Nicolas Pitre | b90b9a3 | 2011-09-13 22:37:07 -0400 | [diff] [blame] | 82 | mem_reg_property[memcount++] = cpu_to_fdt32(atag->u.mem.start); |
| 83 | mem_reg_property[memcount++] = cpu_to_fdt32(atag->u.mem.size); |
| 84 | } else if (atag->hdr.tag == ATAG_INITRD2) { |
| 85 | uint32_t initrd_start, initrd_size; |
| 86 | initrd_start = atag->u.initrd.start; |
| 87 | initrd_size = atag->u.initrd.size; |
| 88 | setprop_cell(fdt, "/chosen", "linux,initrd-start", |
| 89 | initrd_start); |
| 90 | setprop_cell(fdt, "/chosen", "linux,initrd-end", |
| 91 | initrd_start + initrd_size); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | if (memcount) |
| 96 | setprop(fdt, "/memory", "reg", mem_reg_property, 4*memcount); |
| 97 | |
| 98 | return fdt_pack(fdt); |
| 99 | } |