common/fdt_support.c

   1 /*
   2  * (C) Copyright 2007
   3  * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <linux/ctype.h>
  26 #include <linux/types.h>
  27
  28 #ifdef CONFIG_OF_LIBFDT
  29
  30 #include <asm/global_data.h>
  31 #include <fdt.h>
  32 #include <libfdt.h>
  33 #include <fdt_support.h>
  34
  35 /*
  36  * Global data (for the gd->bd)
  37  */
  38 DECLARE_GLOBAL_DATA_PTR;
  39
  40 /*
  41  * fdt points to our working device tree.
  42  */
  43 struct fdt_header *fdt;
  44
  45 /********************************************************************/
  46
  47 /**
  48  * fdt_find_and_setprop: Find a node and set it's property
  49  *
  50  * @fdt: ptr to device tree
  51  * @node: path of node
  52  * @prop: property name
  53  * @val: ptr to new value
  54  * @len: length of new property value
  55  * @create: flag to create the property if it doesn't exist
  56  *
  57  * Convenience function to directly set a property given the path to the node.
  58  */
  59 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
  60                          const void *val, int len, int create)
  61 {
  62         int nodeoff = fdt_path_offset(fdt, node);
  63
  64         if (nodeoff < 0)
  65                 return nodeoff;
  66
  67         if ((!create) && (fdt_get_property(fdt, nodeoff, prop, 0) == NULL))
  68                 return 0; /* create flag not set; so exit quietly */
  69
  70         return fdt_setprop(fdt, nodeoff, prop, val, len);
  71 }
  72
  73 int fdt_chosen(void *fdt, ulong initrd_start, ulong initrd_end, int force)
  74 {
  75         int   nodeoffset;
  76         int   err;
  77         u32   tmp;              /* used to set 32 bit integer properties */
  78         char  *str;             /* used to set string properties */
  79
  80         err = fdt_check_header(fdt);
  81         if (err < 0) {
  82                 printf("fdt_chosen: %s\n", fdt_strerror(err));
  83                 return err;
  84         }
  85
  86         if (initrd_start && initrd_end) {
  87                 uint64_t addr, size;
  88                 int  total = fdt_num_mem_rsv(fdt);
  89                 int  j;
  90
  91                 /*
  92                  * Look for an existing entry and update it.  If we don't find
  93                  * the entry, we will j be the next available slot.
  94                  */
  95                 for (j = 0; j < total; j++) {
  96                         err = fdt_get_mem_rsv(fdt, j, &addr, &size);
  97                         if (addr == initrd_start) {
  98                                 fdt_del_mem_rsv(fdt, j);
  99                                 break;
 100                         }
 101                 }
 102
 103                 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start + 1);
 104                 if (err < 0) {
 105                         printf("fdt_chosen: %s\n", fdt_strerror(err));
 106                         return err;
 107                 }
 108         }
 109
 110         /*
 111          * Find the "chosen" node.
 112          */
 113         nodeoffset = fdt_path_offset (fdt, "/chosen");
 114
 115         /*
 116          * If we have a "chosen" node already the "force the writing"
 117          * is not set, our job is done.
 118          */
 119         if ((nodeoffset >= 0) && !force)
 120                 return 0;
 121
 122         /*
 123          * No "chosen" node in the blob: create it.
 124          */
 125         if (nodeoffset < 0) {
 126                 /*
 127                  * Create a new node "/chosen" (offset 0 is root level)
 128                  */
 129                 nodeoffset = fdt_add_subnode(fdt, 0, "chosen");
 130                 if (nodeoffset < 0) {
 131                         printf("WARNING: could not create /chosen %s.\n",
 132                                 fdt_strerror(nodeoffset));
 133                         return nodeoffset;
 134                 }
 135         }
 136
 137         /*
 138          * Update pre-existing properties, create them if non-existant.
 139          */
 140         str = getenv("bootargs");
 141         if (str != NULL) {
 142                 err = fdt_setprop(fdt, nodeoffset,
 143                         "bootargs", str, strlen(str)+1);
 144                 if (err < 0)
 145                         printf("WARNING: could not set bootargs %s.\n",
 146                                 fdt_strerror(err));
 147         }
 148         if (initrd_start && initrd_end) {
 149                 tmp = __cpu_to_be32(initrd_start);
 150                 err = fdt_setprop(fdt, nodeoffset,
 151                          "linux,initrd-start", &tmp, sizeof(tmp));
 152                 if (err < 0)
 153                         printf("WARNING: "
 154                                 "could not set linux,initrd-start %s.\n",
 155                                 fdt_strerror(err));
 156                 tmp = __cpu_to_be32(initrd_end);
 157                 err = fdt_setprop(fdt, nodeoffset,
 158                         "linux,initrd-end", &tmp, sizeof(tmp));
 159                 if (err < 0)
 160                         printf("WARNING: could not set linux,initrd-end %s.\n",
 161                                 fdt_strerror(err));
 162         }
 163 #ifdef OF_STDOUT_PATH
 164         err = fdt_setprop(fdt, nodeoffset,
 165                 "linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1);
 166         if (err < 0)
 167                 printf("WARNING: could not set linux,stdout-path %s.\n",
 168                         fdt_strerror(err));
 169 #endif
 170
 171         return err;
 172 }
 173
 174 /********************************************************************/
 175
 176 #ifdef CONFIG_OF_HAS_UBOOT_ENV
 177
 178 /* Function that returns a character from the environment */
 179 extern uchar(*env_get_char) (int);
 180
 181
 182 int fdt_env(void *fdt)
 183 {
 184         int   nodeoffset;
 185         int   err;
 186         int   k, nxt;
 187         int i;
 188         static char tmpenv[256];
 189
 190         err = fdt_check_header(fdt);
 191         if (err < 0) {
 192                 printf("fdt_env: %s\n", fdt_strerror(err));
 193                 return err;
 194         }
 195
 196         /*
 197          * See if we already have a "u-boot-env" node, delete it if so.
 198          * Then create a new empty node.
 199          */
 200         nodeoffset = fdt_path_offset (fdt, "/u-boot-env");
 201         if (nodeoffset >= 0) {
 202                 err = fdt_del_node(fdt, nodeoffset);
 203                 if (err < 0) {
 204                         printf("fdt_env: %s\n", fdt_strerror(err));
 205                         return err;
 206                 }
 207         }
 208         /*
 209          * Create a new node "/u-boot-env" (offset 0 is root level)
 210          */
 211         nodeoffset = fdt_add_subnode(fdt, 0, "u-boot-env");
 212         if (nodeoffset < 0) {
 213                 printf("WARNING: could not create /u-boot-env %s.\n",
 214                         fdt_strerror(nodeoffset));
 215                 return nodeoffset;
 216         }
 217
 218         for (i = 0; env_get_char(i) != '\0'; i = nxt + 1) {
 219                 char *s, *lval, *rval;
 220
 221                 /*
 222                  * Find the end of the name=definition
 223                  */
 224                 for (nxt = i; env_get_char(nxt) != '\0'; ++nxt)
 225                         ;
 226                 s = tmpenv;
 227                 for (k = i; k < nxt && s < &tmpenv[sizeof(tmpenv) - 1]; ++k)
 228                         *s++ = env_get_char(k);
 229                 *s++ = '\0';
 230                 lval = tmpenv;
 231                 /*
 232                  * Find the first '=': it separates the name from the value
 233                  */
 234                 s = strchr(tmpenv, '=');
 235                 if (s != NULL) {
 236                         *s++ = '\0';
 237                         rval = s;
 238                 } else
 239                         continue;
 240                 err = fdt_setprop(fdt, nodeoffset, lval, rval, strlen(rval)+1);
 241                 if (err < 0) {
 242                         printf("WARNING: could not set %s %s.\n",
 243                                 lval, fdt_strerror(err));
 244                         return err;
 245                 }
 246         }
 247         return 0;
 248 }
 249 #endif /* ifdef CONFIG_OF_HAS_UBOOT_ENV */
 250
 251 /********************************************************************/
 252
 253 #ifdef CONFIG_OF_HAS_BD_T
 254
 255 #define BDM(x)  {       .name = #x, .offset = offsetof(bd_t, bi_ ##x ) }
 256
 257 static const struct {
 258         const char *name;
 259         int offset;
 260 } bd_map[] = {
 261         BDM(memstart),
 262         BDM(memsize),
 263         BDM(flashstart),
 264         BDM(flashsize),
 265         BDM(flashoffset),
 266         BDM(sramstart),
 267         BDM(sramsize),
 268 #if defined(CONFIG_5xx) || defined(CONFIG_8xx) || defined(CONFIG_8260) \
 269         || defined(CONFIG_E500)
 270         BDM(immr_base),
 271 #endif
 272 #if defined(CONFIG_MPC5xxx)
 273         BDM(mbar_base),
 274 #endif
 275 #if defined(CONFIG_MPC83XX)
 276         BDM(immrbar),
 277 #endif
 278 #if defined(CONFIG_MPC8220)
 279         BDM(mbar_base),
 280         BDM(inpfreq),
 281         BDM(pcifreq),
 282         BDM(pevfreq),
 283         BDM(flbfreq),
 284         BDM(vcofreq),
 285 #endif
 286         BDM(bootflags),
 287         BDM(ip_addr),
 288         BDM(intfreq),
 289         BDM(busfreq),
 290 #ifdef CONFIG_CPM2
 291         BDM(cpmfreq),
 292         BDM(brgfreq),
 293         BDM(sccfreq),
 294         BDM(vco),
 295 #endif
 296 #if defined(CONFIG_MPC5xxx)
 297         BDM(ipbfreq),
 298         BDM(pcifreq),
 299 #endif
 300         BDM(baudrate),
 301 };
 302
 303
 304 int fdt_bd_t(void *fdt)
 305 {
 306         bd_t *bd = gd->bd;
 307         int   nodeoffset;
 308         int   err;
 309         u32   tmp;              /* used to set 32 bit integer properties */
 310         int i;
 311
 312         err = fdt_check_header(fdt);
 313         if (err < 0) {
 314                 printf("fdt_bd_t: %s\n", fdt_strerror(err));
 315                 return err;
 316         }
 317
 318         /*
 319          * See if we already have a "bd_t" node, delete it if so.
 320          * Then create a new empty node.
 321          */
 322         nodeoffset = fdt_path_offset (fdt, "/bd_t");
 323         if (nodeoffset >= 0) {
 324                 err = fdt_del_node(fdt, nodeoffset);
 325                 if (err < 0) {
 326                         printf("fdt_bd_t: %s\n", fdt_strerror(err));
 327                         return err;
 328                 }
 329         }
 330         /*
 331          * Create a new node "/bd_t" (offset 0 is root level)
 332          */
 333         nodeoffset = fdt_add_subnode(fdt, 0, "bd_t");
 334         if (nodeoffset < 0) {
 335                 printf("WARNING: could not create /bd_t %s.\n",
 336                         fdt_strerror(nodeoffset));
 337                 printf("fdt_bd_t: %s\n", fdt_strerror(nodeoffset));
 338                 return nodeoffset;
 339         }
 340         /*
 341          * Use the string/pointer structure to create the entries...
 342          */
 343         for (i = 0; i < sizeof(bd_map)/sizeof(bd_map[0]); i++) {
 344                 tmp = cpu_to_be32(getenv("bootargs"));
 345                 err = fdt_setprop(fdt, nodeoffset,
 346                         bd_map[i].name, &tmp, sizeof(tmp));
 347                 if (err < 0)
 348                         printf("WARNING: could not set %s %s.\n",
 349                                 bd_map[i].name, fdt_strerror(err));
 350         }
 351         /*
 352          * Add a couple of oddball entries...
 353          */
 354         err = fdt_setprop(fdt, nodeoffset, "enetaddr", &bd->bi_enetaddr, 6);
 355         if (err < 0)
 356                 printf("WARNING: could not set enetaddr %s.\n",
 357                         fdt_strerror(err));
 358         err = fdt_setprop(fdt, nodeoffset, "ethspeed", &bd->bi_ethspeed, 4);
 359         if (err < 0)
 360                 printf("WARNING: could not set ethspeed %s.\n",
 361                         fdt_strerror(err));
 362         return 0;
 363 }
 364 #endif /* ifdef CONFIG_OF_HAS_BD_T */
 365
 366 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
 367                       const void *val, int len, int create)
 368 {
 369 #if defined(DEBUG)
 370         int i;
 371         debug("Updating property '%s/%s' = ", node, prop);
 372         for (i = 0; i < len; i++)
 373                 debug(" %.2x", *(u8*)(val+i));
 374         debug("\n");
 375 #endif
 376         int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
 377         if (rc)
 378                 printf("Unable to update property %s:%s, err=%s\n",
 379                         path, prop, fdt_strerror(rc));
 380 }
 381
 382 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
 383                           u32 val, int create)
 384 {
 385         val = cpu_to_fdt32(val);
 386         do_fixup_by_path(fdt, path, prop, &val, sizeof(val), create);
 387 }
 388
 389 void fdt_fixup_ethernet(void *fdt, bd_t *bd)
 390 {
 391         int node;
 392         const char *path;
 393
 394         node = fdt_path_offset(fdt, "/aliases");
 395         if (node >= 0) {
 396 #if defined(CONFIG_HAS_ETH0)
 397                 path = fdt_getprop(fdt, node, "ethernet0", NULL);
 398                 if (path) {
 399                         do_fixup_by_path(fdt, path, "mac-address",
 400                                 bd->bi_enetaddr, 6, 0);
 401                         do_fixup_by_path(fdt, path, "local-mac-address",
 402                                 bd->bi_enetaddr, 6, 1);
 403                 }
 404 #endif
 405 #if defined(CONFIG_HAS_ETH1)
 406                 path = fdt_getprop(fdt, node, "ethernet1", NULL);
 407                 if (path) {
 408                         do_fixup_by_path(fdt, path, "mac-address",
 409                                 bd->bi_enet1addr, 6, 0);
 410                         do_fixup_by_path(fdt, path, "local-mac-address",
 411                                 bd->bi_enet1addr, 6, 1);
 412                 }
 413 #endif
 414 #if defined(CONFIG_HAS_ETH2)
 415                 path = fdt_getprop(fdt, node, "ethernet2", NULL);
 416                 if (path) {
 417                         do_fixup_by_path(fdt, path, "mac-address",
 418                                 bd->bi_enet2addr, 6, 0);
 419                         do_fixup_by_path(fdt, path, "local-mac-address",
 420                                 bd->bi_enet2addr, 6, 1);
 421                 }
 422 #endif
 423 #if defined(CONFIG_HAS_ETH3)
 424                 path = fdt_getprop(fdt, node, "ethernet3", NULL);
 425                 if (path) {
 426                         do_fixup_by_path(fdt, path, "mac-address",
 427                                 bd->bi_enet3addr, 6, 0);
 428                         do_fixup_by_path(fdt, path, "local-mac-address",
 429                                 bd->bi_enet3addr, 6, 1);
 430                 }
 431 #endif
 432         }
 433 }
 434
 435 #endif /* CONFIG_OF_LIBFDT */