common/ft_build.c

   1 /*
   2  * OF flat tree builder
   3  * Written by: Pantelis Antoniou <pantelis.antoniou@gmail.com>
   4  * Updated by: Matthew McClintock <msm@freescale.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License as
   8  * published by the Free Software Foundation; either version 2 of
   9  * the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  19  * MA 02111-1307 USA
  20  */
  21
  22 #include <common.h>
  23 #include <malloc.h>
  24 #include <environment.h>
  25
  26 #ifdef CONFIG_OF_FLAT_TREE
  27
  28 #include <asm/errno.h>
  29 #include <stddef.h>
  30
  31 #include <ft_build.h>
  32
  33 #undef DEBUG
  34
  35 /* align addr on a size boundary - adjust address up if needed -- Cort */
  36 #define _ALIGN(addr,size)       (((addr)+(size)-1)&(~((size)-1)))
  37 #ifndef CONFIG_OF_BOOT_CPU
  38 #define CONFIG_OF_BOOT_CPU 0
  39 #endif
  40 #define SIZE_OF_RSVMAP_ENTRY (2*sizeof(u64))
  41
  42 static void ft_put_word(struct ft_cxt *cxt, u32 v)
  43 {
  44         memmove(cxt->p + sizeof(u32), cxt->p, cxt->p_end - cxt->p);
  45
  46         *(u32 *) cxt->p = cpu_to_be32(v);
  47         cxt->p += sizeof(u32);
  48         cxt->p_end += sizeof(u32);
  49 }
  50
  51 static inline void ft_put_bin(struct ft_cxt *cxt, const void *data, int sz)
  52 {
  53         int aligned_size = ((u8 *)_ALIGN((unsigned long)cxt->p + sz,
  54                                         sizeof(u32))) - cxt->p;
  55
  56         memmove(cxt->p + aligned_size, cxt->p, cxt->p_end - cxt->p);
  57
  58         /* make sure the last bytes are zeroed */
  59         memset(cxt->p + aligned_size - (aligned_size % sizeof(u32)), 0,
  60                         (aligned_size % sizeof(u32)));
  61
  62         memcpy(cxt->p, data, sz);
  63
  64         cxt->p += aligned_size;
  65         cxt->p_end += aligned_size;
  66 }
  67
  68 void ft_begin_node(struct ft_cxt *cxt, const char *name)
  69 {
  70         ft_put_word(cxt, OF_DT_BEGIN_NODE);
  71         ft_put_bin(cxt, name, strlen(name) + 1);
  72 }
  73
  74 void ft_end_node(struct ft_cxt *cxt)
  75 {
  76         ft_put_word(cxt, OF_DT_END_NODE);
  77 }
  78
  79 void ft_nop(struct ft_cxt *cxt)
  80 {
  81         ft_put_word(cxt, OF_DT_NOP);
  82 }
  83
  84 static int lookup_string(struct ft_cxt *cxt, const char *name)
  85 {
  86         u8 *p;
  87
  88         p = cxt->p;
  89         while (p < cxt->p_end) {
  90                 if (strcmp(p, name) == 0)
  91                         return p - cxt->p;
  92                 p += strlen(p) + 1;
  93         }
  94
  95         return -1;
  96 }
  97
  98 void ft_prop(struct ft_cxt *cxt, const char *name, const void *data, int sz)
  99 {
 100         int off = 0;
 101
 102         off = lookup_string(cxt, name);
 103         if (off == -1) {
 104                 memcpy(cxt->p_end, name, strlen(name) + 1);
 105                 off = cxt->p_end - cxt->p;
 106                 cxt->p_end += strlen(name) + 2;
 107         }
 108
 109         /* now put offset from beginning of *STRUCTURE* */
 110         /* will be fixed up at the end */
 111         ft_put_word(cxt, OF_DT_PROP);
 112         ft_put_word(cxt, sz);
 113         ft_put_word(cxt, off);
 114         ft_put_bin(cxt, data, sz);
 115 }
 116
 117 void ft_prop_str(struct ft_cxt *cxt, const char *name, const char *str)
 118 {
 119         ft_prop(cxt, name, str, strlen(str) + 1);
 120 }
 121
 122 void ft_prop_int(struct ft_cxt *cxt, const char *name, int val)
 123 {
 124         u32 v = cpu_to_be32((u32) val);
 125
 126         ft_prop(cxt, name, &v, sizeof(u32));
 127 }
 128
 129 /* pick up and start working on a tree in place */
 130 void ft_init_cxt(struct ft_cxt *cxt, void *blob)
 131 {
 132         struct boot_param_header *bph = blob;
 133
 134         memset(cxt, 0, sizeof(*cxt));
 135
 136         cxt->bph = bph;
 137         bph->boot_cpuid_phys = CONFIG_OF_BOOT_CPU;
 138
 139         /* find beginning and end of reserve map table (zeros in last entry) */
 140         cxt->p_rsvmap = (u8 *)bph + bph->off_mem_rsvmap;
 141         while ( ((uint64_t *)cxt->p_rsvmap)[0] != 0 &&
 142                      ((uint64_t *)cxt->p_rsvmap)[1] != 0 ) {
 143         cxt->p_rsvmap += SIZE_OF_RSVMAP_ENTRY;
 144         }
 145
 146         cxt->p_start = (char*)bph + bph->off_dt_struct;
 147         cxt->p_end = (char *)bph + bph->totalsize;
 148         cxt->p = (char *)bph + bph->off_dt_strings;
 149 }
 150
 151 /* add a reserver physical area to the rsvmap */
 152 void ft_add_rsvmap(struct ft_cxt *cxt, u64 physstart, u64 physend)
 153 {
 154         memmove(cxt->p_rsvmap + SIZE_OF_RSVMAP_ENTRY, cxt->p_rsvmap,
 155                                  cxt->p_end - cxt->p_rsvmap);
 156
 157         ((u64 *)cxt->p_rsvmap)[0] = cpu_to_be64(physstart);
 158         ((u64 *)cxt->p_rsvmap)[1] = cpu_to_be64(physend);
 159         ((u64 *)cxt->p_rsvmap)[2] = 0;
 160         ((u64 *)cxt->p_rsvmap)[3] = 0;
 161
 162         cxt->p_rsvmap += SIZE_OF_RSVMAP_ENTRY;
 163         cxt->p_start += SIZE_OF_RSVMAP_ENTRY;
 164         cxt->p += SIZE_OF_RSVMAP_ENTRY;
 165         cxt->p_end += SIZE_OF_RSVMAP_ENTRY;
 166 }
 167
 168 void ft_end_tree(struct ft_cxt *cxt)
 169 {
 170         ft_put_word(cxt, OF_DT_END);
 171 }
 172
 173 /* update the boot param header with correct values */
 174 void ft_finalize_tree(struct ft_cxt *cxt) {
 175         struct boot_param_header *bph = cxt->bph;
 176
 177         bph->totalsize = cxt->p_end - (u8 *)bph;
 178         bph->off_dt_struct = cxt->p_start - (u8 *)bph;
 179         bph->off_dt_strings = cxt->p - (u8 *)bph;
 180         bph->dt_strings_size = cxt->p_end - cxt->p;
 181 }
 182
 183 static inline int isprint(int c)
 184 {
 185         return c >= 0x20 && c <= 0x7e;
 186 }
 187
 188 static int is_printable_string(const void *data, int len)
 189 {
 190         const char *s = data;
 191         const char *ss;
 192
 193         /* zero length is not */
 194         if (len == 0)
 195                 return 0;
 196
 197         /* must terminate with zero */
 198         if (s[len - 1] != '\0')
 199                 return 0;
 200
 201         ss = s;
 202         while (*s && isprint(*s))
 203                 s++;
 204
 205         /* not zero, or not done yet */
 206         if (*s != '\0' || (s + 1 - ss) < len)
 207                 return 0;
 208
 209         return 1;
 210 }
 211
 212 static void print_data(const void *data, int len)
 213 {
 214         int i;
 215         const u8 *s;
 216
 217         /* no data, don't print */
 218         if (len == 0)
 219                 return;
 220
 221         if (is_printable_string(data, len)) {
 222                 puts(" = \"");
 223                 puts(data);
 224                 puts("\"");
 225                 return;
 226         }
 227
 228         switch (len) {
 229         case 1:         /* byte */
 230                 printf(" = <%02x>", (*(u8 *) data) & 0xff);
 231                 break;
 232         case 2:         /* half-word */
 233                 printf(" = <%04x>", be16_to_cpu(*(u16 *) data) & 0xffff);
 234                 break;
 235         case 4:         /* word */
 236                 printf(" = <%x>", be32_to_cpu(*(u32 *) data) & 0xffffffffU);
 237                 break;
 238         case 8:         /* double-word */
 239                 printf(" = <%qx>", be64_to_cpu(*(uint64_t *) data));
 240                 break;
 241         default:                /* anything else... hexdump */
 242                 printf(" = [");
 243                 for (i = 0, s = data; i < len; i++)
 244                         printf("%02x%s", s[i], i < len - 1 ? " " : "");
 245                 printf("]");
 246
 247                 break;
 248         }
 249 }
 250
 251 void ft_dump_blob(const void *bphp)
 252 {
 253         const struct boot_param_header *bph = bphp;
 254         const uint64_t *p_rsvmap = (const uint64_t *)
 255                 ((const char *)bph + be32_to_cpu(bph->off_mem_rsvmap));
 256         const u32 *p_struct = (const u32 *)
 257                 ((const char *)bph + be32_to_cpu(bph->off_dt_struct));
 258         const u32 *p_strings = (const u32 *)
 259                 ((const char *)bph + be32_to_cpu(bph->off_dt_strings));
 260         u32 tag;
 261         const u32 *p;
 262         const char *s, *t;
 263         int depth, sz, shift;
 264         int i;
 265         uint64_t addr, size;
 266
 267         if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
 268                 /* not valid tree */
 269                 return;
 270         }
 271
 272         depth = 0;
 273         shift = 4;
 274
 275         for (i = 0;; i++) {
 276                 addr = be64_to_cpu(p_rsvmap[i * 2]);
 277                 size = be64_to_cpu(p_rsvmap[i * 2 + 1]);
 278                 if (addr == 0 && size == 0)
 279                         break;
 280
 281                 printf("/memreserve/ %qx %qx;\n", addr, size);
 282         }
 283
 284         p = p_struct;
 285         while ((tag = be32_to_cpu(*p++)) != OF_DT_END) {
 286
 287                 /* printf("tag: 0x%08x (%d)\n", tag, p - p_struct); */
 288
 289                 if (tag == OF_DT_BEGIN_NODE) {
 290                         s = (const char *)p;
 291                         p = (u32 *) _ALIGN((unsigned long)p + strlen(s) + 1, 4);
 292
 293                         printf("%*s%s {\n", depth * shift, "", s);
 294
 295                         depth++;
 296                         continue;
 297                 }
 298
 299                 if (tag == OF_DT_END_NODE) {
 300                         depth--;
 301
 302                         printf("%*s};\n", depth * shift, "");
 303                         continue;
 304                 }
 305
 306                 if (tag == OF_DT_NOP) {
 307                         printf("%*s[NOP]\n", depth * shift, "");
 308                         continue;
 309                 }
 310
 311                 if (tag != OF_DT_PROP) {
 312                         fprintf(stderr, "%*s ** Unknown tag 0x%08x at 0x%x\n",
 313                                 depth * shift, "", tag, --p);
 314                         break;
 315                 }
 316                 sz = be32_to_cpu(*p++);
 317                 s = (const char *)p_strings + be32_to_cpu(*p++);
 318                 t = (const char *)p;
 319                 p = (const u32 *)_ALIGN((unsigned long)p + sz, 4);
 320                 printf("%*s%s", depth * shift, "", s);
 321                 print_data(t, sz);
 322                 printf(";\n");
 323         }
 324 }
 325
 326 void ft_backtrack_node(struct ft_cxt *cxt)
 327 {
 328         int i = 4;
 329
 330         while (be32_to_cpu(*(u32 *) (cxt->p - i)) != OF_DT_END_NODE)
 331                 i += 4;
 332
 333         memmove (cxt->p - i, cxt->p, cxt->p_end - cxt->p);
 334
 335         cxt->p_end -= i;
 336         cxt->p -= i;
 337 }
 338
 339 void *ft_get_prop(void *bphp, const char *propname, int *szp)
 340 {
 341         struct boot_param_header *bph = bphp;
 342         uint32_t *p_struct =
 343             (uint32_t *) ((char *)bph + be32_to_cpu(bph->off_dt_struct));
 344         uint32_t *p_strings =
 345             (uint32_t *) ((char *)bph + be32_to_cpu(bph->off_dt_strings));
 346         uint32_t version = be32_to_cpu(bph->version);
 347         uint32_t tag;
 348         uint32_t *p;
 349         char *s, *t;
 350         char *ss;
 351         int sz;
 352         static char path[256], prop[256];
 353
 354         path[0] = '\0';
 355
 356         p = p_struct;
 357         while ((tag = be32_to_cpu(*p++)) != OF_DT_END) {
 358
 359                 if (tag == OF_DT_BEGIN_NODE) {
 360                         s = (char *)p;
 361                         p = (uint32_t *) _ALIGN((unsigned long)p + strlen(s) +
 362                                                 1, 4);
 363                         strcat(path, s);
 364                         strcat(path, "/");
 365                         continue;
 366                 }
 367
 368                 if (tag == OF_DT_END_NODE) {
 369                         path[strlen(path) - 1] = '\0';
 370                         ss = strrchr(path, '/');
 371                         if (ss != NULL)
 372                                 ss[1] = '\0';
 373                         continue;
 374                 }
 375
 376                 if (tag == OF_DT_NOP)
 377                         continue;
 378
 379                 if (tag != OF_DT_PROP)
 380                         break;
 381
 382                 sz = be32_to_cpu(*p++);
 383                 s = (char *)p_strings + be32_to_cpu(*p++);
 384                 if (version < 0x10 && sz >= 8)
 385                         p = (uint32_t *) _ALIGN((unsigned long)p, 8);
 386                 t = (char *)p;
 387                 p = (uint32_t *) _ALIGN((unsigned long)p + sz, 4);
 388
 389                 strcpy(prop, path);
 390                 strcat(prop, s);
 391
 392                 if (strcmp(prop, propname) == 0) {
 393                         *szp = sz;
 394                         return t;
 395                 }
 396         }
 397
 398         return NULL;
 399 }
 400
 401 /********************************************************************/
 402
 403 /* Function that returns a character from the environment */
 404 extern uchar(*env_get_char) (int);
 405
 406 #define BDM(x)  {       .name = #x, .offset = offsetof(bd_t, bi_ ##x ) }
 407
 408 #ifdef CONFIG_OF_HAS_BD_T
 409 static const struct {
 410         const char *name;
 411         int offset;
 412 } bd_map[] = {
 413         BDM(memstart),
 414         BDM(memsize),
 415         BDM(flashstart),
 416         BDM(flashsize),
 417         BDM(flashoffset),
 418         BDM(sramstart),
 419         BDM(sramsize),
 420 #if defined(CONFIG_5xx) || defined(CONFIG_8xx) || defined(CONFIG_8260) \
 421         || defined(CONFIG_E500)
 422         BDM(immr_base),
 423 #endif
 424 #if defined(CONFIG_MPC5xxx)
 425         BDM(mbar_base),
 426 #endif
 427 #if defined(CONFIG_MPC83XX)
 428         BDM(immrbar),
 429 #endif
 430 #if defined(CONFIG_MPC8220)
 431         BDM(mbar_base),
 432         BDM(inpfreq),
 433         BDM(pcifreq),
 434         BDM(pevfreq),
 435         BDM(flbfreq),
 436         BDM(vcofreq),
 437 #endif
 438         BDM(bootflags),
 439         BDM(ip_addr),
 440         BDM(intfreq),
 441         BDM(busfreq),
 442 #ifdef CONFIG_CPM2
 443         BDM(cpmfreq),
 444         BDM(brgfreq),
 445         BDM(sccfreq),
 446         BDM(vco),
 447 #endif
 448 #if defined(CONFIG_MPC5xxx)
 449         BDM(ipbfreq),
 450         BDM(pcifreq),
 451 #endif
 452         BDM(baudrate),
 453 };
 454 #endif
 455
 456 void ft_setup(void *blob, bd_t * bd, ulong initrd_start, ulong initrd_end)
 457 {
 458         u32 *p;
 459         int len;
 460         struct ft_cxt cxt;
 461         ulong clock;
 462 #if defined(CONFIG_OF_HAS_UBOOT_ENV)
 463         int k, nxt;
 464 #endif
 465 #if defined(CONFIG_OF_HAS_BD_T)
 466         u8 *end;
 467 #endif
 468 #if defined(CONFIG_OF_HAS_UBOOT_ENV) || defined(CONFIG_OF_HAS_BD_T)
 469         int i;
 470         static char tmpenv[256];
 471 #endif
 472
 473         /* disable OF tree; booting old kernel */
 474         if (getenv("disable_of") != NULL) {
 475                 memcpy(blob, bd, sizeof(*bd));
 476                 return;
 477         }
 478
 479 #ifdef DEBUG
 480         printf ("recieved oftree\n");
 481         ft_dump_blob(blob);
 482 #endif
 483
 484         ft_init_cxt(&cxt, blob);
 485
 486         if (initrd_start && initrd_end)
 487                 ft_add_rsvmap(&cxt, initrd_start, initrd_end - initrd_start + 1);
 488
 489         /* back into root */
 490         ft_backtrack_node(&cxt);
 491
 492 #ifdef CONFIG_OF_HAS_UBOOT_ENV
 493         ft_begin_node(&cxt, "u-boot-env");
 494
 495         for (i = 0; env_get_char(i) != '\0'; i = nxt + 1) {
 496                 char *s, *lval, *rval;
 497
 498                 for (nxt = i; env_get_char(nxt) != '\0'; ++nxt) ;
 499                 s = tmpenv;
 500                 for (k = i; k < nxt && s < &tmpenv[sizeof(tmpenv) - 1]; ++k)
 501                         *s++ = env_get_char(k);
 502                 *s++ = '\0';
 503                 lval = tmpenv;
 504                 s = strchr(tmpenv, '=');
 505                 if (s != NULL) {
 506                         *s++ = '\0';
 507                         rval = s;
 508                 } else
 509                         continue;
 510                 ft_prop_str(&cxt, lval, rval);
 511         }
 512
 513         ft_end_node(&cxt);
 514 #endif
 515
 516         ft_begin_node(&cxt, "chosen");
 517         ft_prop_str(&cxt, "name", "chosen");
 518
 519         ft_prop_str(&cxt, "bootargs", getenv("bootargs"));
 520         ft_prop_int(&cxt, "linux,platform", 0x600);     /* what is this? */
 521         if (initrd_start && initrd_end) {
 522                 ft_prop_int(&cxt, "linux,initrd-start", initrd_start);
 523                 ft_prop_int(&cxt, "linux,initrd-end", initrd_end);
 524         }
 525 #ifdef OF_STDOUT_PATH
 526         ft_prop_str(&cxt, "linux,stdout-path", OF_STDOUT_PATH);
 527 #endif
 528
 529         ft_end_node(&cxt);
 530
 531         ft_end_node(&cxt);      /* end root */
 532
 533         ft_end_tree(&cxt);
 534         ft_finalize_tree(&cxt);
 535
 536 #ifdef CONFIG_OF_HAS_BD_T
 537         /* paste the bd_t at the end of the flat tree */
 538         end = (char *)blob +
 539             be32_to_cpu(((struct boot_param_header *)blob)->totalsize);
 540         memcpy(end, bd, sizeof(*bd));
 541 #endif
 542
 543 #ifdef CONFIG_PPC
 544
 545 #ifdef CONFIG_OF_HAS_BD_T
 546         for (i = 0; i < sizeof(bd_map)/sizeof(bd_map[0]); i++) {
 547                 uint32_t v;
 548
 549                 sprintf(tmpenv, "/bd_t/%s", bd_map[i].name);
 550                 v = *(uint32_t *)((char *)bd + bd_map[i].offset);
 551
 552                 p = ft_get_prop(blob, tmpenv, &len);
 553                 if (p != NULL)
 554                         *p = cpu_to_be32(v);
 555         }
 556
 557         p = ft_get_prop(blob, "/bd_t/enetaddr", &len);
 558         if (p != NULL)
 559                 memcpy(p, bd->bi_enetaddr, 6);
 560
 561         p = ft_get_prop(blob, "/bd_t/ethspeed", &len);
 562         if (p != NULL)
 563                 *p = cpu_to_be32((uint32_t) bd->bi_ethspeed);
 564 #endif
 565
 566         clock = bd->bi_intfreq;
 567         p = ft_get_prop(blob, "/cpus/" OF_CPU "/clock-frequency", &len);
 568         if (p != NULL)
 569                 *p = cpu_to_be32(clock);
 570
 571 #ifdef OF_TBCLK
 572         clock = OF_TBCLK;
 573         p = ft_get_prop(blob, "/cpus/" OF_CPU "/timebase-frequency", &len);
 574         if (p != NULL)
 575                 *p = cpu_to_be32(clock);
 576 #endif
 577 #endif                          /* __powerpc__ */
 578
 579 #ifdef CONFIG_OF_BOARD_SETUP
 580         ft_board_setup(blob, bd);
 581 #endif
 582
 583         /* in case the size changed in the platform code */
 584         ft_finalize_tree(&cxt);
 585
 586 #ifdef DEBUG
 587         printf("final OF-tree\n");
 588         ft_dump_blob(blob);
 589 #endif
 590 }
 591 #endif