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 #include <asm/global_data.h>
  28 #include <fdt.h>
  29 #include <libfdt.h>
  30 #include <fdt_support.h>
  31 #include <exports.h>
  32
  33 /*
  34  * Global data (for the gd->bd)
  35  */
  36 DECLARE_GLOBAL_DATA_PTR;
  37
  38
  39 /**
  40  * fdt_find_and_setprop: Find a node and set it's property
  41  *
  42  * @fdt: ptr to device tree
  43  * @node: path of node
  44  * @prop: property name
  45  * @val: ptr to new value
  46  * @len: length of new property value
  47  * @create: flag to create the property if it doesn't exist
  48  *
  49  * Convenience function to directly set a property given the path to the node.
  50  */
  51 int fdt_find_and_setprop(void *fdt, const char *node, const char *prop,
  52                          const void *val, int len, int create)
  53 {
  54         int nodeoff = fdt_path_offset(fdt, node);
  55
  56         if (nodeoff < 0)
  57                 return nodeoff;
  58
  59         if ((!create) && (fdt_get_property(fdt, nodeoff, prop, 0) == NULL))
  60                 return 0; /* create flag not set; so exit quietly */
  61
  62         return fdt_setprop(fdt, nodeoff, prop, val, len);
  63 }
  64
  65 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS
  66 static int fdt_fixup_stdout(void *fdt, int chosenoff)
  67 {
  68         int err = 0;
  69 #ifdef CONFIG_CONS_INDEX
  70         int node;
  71         char sername[9] = { 0 };
  72         const char *path;
  73
  74         sprintf(sername, "serial%d", CONFIG_CONS_INDEX - 1);
  75
  76         err = node = fdt_path_offset(fdt, "/aliases");
  77         if (node >= 0) {
  78                 int len;
  79                 path = fdt_getprop(fdt, node, sername, &len);
  80                 if (path) {
  81                         char *p = malloc(len);
  82                         err = -FDT_ERR_NOSPACE;
  83                         if (p) {
  84                                 memcpy(p, path, len);
  85                                 err = fdt_setprop(fdt, chosenoff,
  86                                         "linux,stdout-path", p, len);
  87                                 free(p);
  88                         }
  89                 } else {
  90                         err = len;
  91                 }
  92         }
  93 #endif
  94         if (err < 0)
  95                 printf("WARNING: could not set linux,stdout-path %s.\n",
  96                                 fdt_strerror(err));
  97
  98         return err;
  99 }
 100 #endif
 101
 102 int fdt_chosen(void *fdt, ulong initrd_start, ulong initrd_end, int force)
 103 {
 104         int   nodeoffset;
 105         int   err;
 106         u32   tmp;              /* used to set 32 bit integer properties */
 107         char  *str;             /* used to set string properties */
 108         const char *path;
 109
 110         err = fdt_check_header(fdt);
 111         if (err < 0) {
 112                 printf("fdt_chosen: %s\n", fdt_strerror(err));
 113                 return err;
 114         }
 115
 116         if (initrd_start && initrd_end) {
 117                 uint64_t addr, size;
 118                 int  total = fdt_num_mem_rsv(fdt);
 119                 int  j;
 120
 121                 /*
 122                  * Look for an existing entry and update it.  If we don't find
 123                  * the entry, we will j be the next available slot.
 124                  */
 125                 for (j = 0; j < total; j++) {
 126                         err = fdt_get_mem_rsv(fdt, j, &addr, &size);
 127                         if (addr == initrd_start) {
 128                                 fdt_del_mem_rsv(fdt, j);
 129                                 break;
 130                         }
 131                 }
 132
 133                 err = fdt_add_mem_rsv(fdt, initrd_start, initrd_end - initrd_start + 1);
 134                 if (err < 0) {
 135                         printf("fdt_chosen: %s\n", fdt_strerror(err));
 136                         return err;
 137                 }
 138         }
 139
 140         /*
 141          * Find the "chosen" node.
 142          */
 143         nodeoffset = fdt_path_offset (fdt, "/chosen");
 144
 145         /*
 146          * If there is no "chosen" node in the blob, create it.
 147          */
 148         if (nodeoffset < 0) {
 149                 /*
 150                  * Create a new node "/chosen" (offset 0 is root level)
 151                  */
 152                 nodeoffset = fdt_add_subnode(fdt, 0, "chosen");
 153                 if (nodeoffset < 0) {
 154                         printf("WARNING: could not create /chosen %s.\n",
 155                                 fdt_strerror(nodeoffset));
 156                         return nodeoffset;
 157                 }
 158         }
 159
 160         /*
 161          * Create /chosen properites that don't exist in the fdt.
 162          * If the property exists, update it only if the "force" parameter
 163          * is true.
 164          */
 165         str = getenv("bootargs");
 166         if (str != NULL) {
 167                 path = fdt_getprop(fdt, nodeoffset, "bootargs", NULL);
 168                 if ((path == NULL) || force) {
 169                         err = fdt_setprop(fdt, nodeoffset,
 170                                 "bootargs", str, strlen(str)+1);
 171                         if (err < 0)
 172                                 printf("WARNING: could not set bootargs %s.\n",
 173                                         fdt_strerror(err));
 174                 }
 175         }
 176         if (initrd_start && initrd_end) {
 177                 path = fdt_getprop(fdt, nodeoffset, "linux,initrd-start", NULL);
 178                 if ((path == NULL) || force) {
 179                         tmp = __cpu_to_be32(initrd_start);
 180                         err = fdt_setprop(fdt, nodeoffset,
 181                                 "linux,initrd-start", &tmp, sizeof(tmp));
 182                         if (err < 0)
 183                                 printf("WARNING: "
 184                                         "could not set linux,initrd-start %s.\n",
 185                                         fdt_strerror(err));
 186                         tmp = __cpu_to_be32(initrd_end);
 187                         err = fdt_setprop(fdt, nodeoffset,
 188                                 "linux,initrd-end", &tmp, sizeof(tmp));
 189                         if (err < 0)
 190                                 printf("WARNING: could not set linux,initrd-end %s.\n",
 191                                         fdt_strerror(err));
 192                 }
 193         }
 194
 195 #ifdef CONFIG_OF_STDOUT_VIA_ALIAS
 196         path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
 197         if ((path == NULL) || force)
 198                 err = fdt_fixup_stdout(fdt, nodeoffset);
 199 #endif
 200
 201 #ifdef OF_STDOUT_PATH
 202         path = fdt_getprop(fdt, nodeoffset, "linux,stdout-path", NULL);
 203         if ((path == NULL) || force) {
 204                 err = fdt_setprop(fdt, nodeoffset,
 205                         "linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1);
 206                 if (err < 0)
 207                         printf("WARNING: could not set linux,stdout-path %s.\n",
 208                                 fdt_strerror(err));
 209         }
 210 #endif
 211
 212         return err;
 213 }
 214
 215 void do_fixup_by_path(void *fdt, const char *path, const char *prop,
 216                       const void *val, int len, int create)
 217 {
 218 #if defined(DEBUG)
 219         int i;
 220         debug("Updating property '%s/%s' = ", path, prop);
 221         for (i = 0; i < len; i++)
 222                 debug(" %.2x", *(u8*)(val+i));
 223         debug("\n");
 224 #endif
 225         int rc = fdt_find_and_setprop(fdt, path, prop, val, len, create);
 226         if (rc)
 227                 printf("Unable to update property %s:%s, err=%s\n",
 228                         path, prop, fdt_strerror(rc));
 229 }
 230
 231 void do_fixup_by_path_u32(void *fdt, const char *path, const char *prop,
 232                           u32 val, int create)
 233 {
 234         val = cpu_to_fdt32(val);
 235         do_fixup_by_path(fdt, path, prop, &val, sizeof(val), create);
 236 }
 237
 238 void do_fixup_by_prop(void *fdt,
 239                       const char *pname, const void *pval, int plen,
 240                       const char *prop, const void *val, int len,
 241                       int create)
 242 {
 243         int off;
 244 #if defined(DEBUG)
 245         int i;
 246         debug("Updating property '%s' = ", prop);
 247         for (i = 0; i < len; i++)
 248                 debug(" %.2x", *(u8*)(val+i));
 249         debug("\n");
 250 #endif
 251         off = fdt_node_offset_by_prop_value(fdt, -1, pname, pval, plen);
 252         while (off != -FDT_ERR_NOTFOUND) {
 253                 if (create || (fdt_get_property(fdt, off, prop, 0) != NULL))
 254                         fdt_setprop(fdt, off, prop, val, len);
 255                 off = fdt_node_offset_by_prop_value(fdt, off, pname, pval, plen);
 256         }
 257 }
 258
 259 void do_fixup_by_prop_u32(void *fdt,
 260                           const char *pname, const void *pval, int plen,
 261                           const char *prop, u32 val, int create)
 262 {
 263         val = cpu_to_fdt32(val);
 264         do_fixup_by_prop(fdt, pname, pval, plen, prop, &val, 4, create);
 265 }
 266
 267 void do_fixup_by_compat(void *fdt, const char *compat,
 268                         const char *prop, const void *val, int len, int create)
 269 {
 270         int off = -1;
 271 #if defined(DEBUG)
 272         int i;
 273         debug("Updating property '%s' = ", prop);
 274         for (i = 0; i < len; i++)
 275                 debug(" %.2x", *(u8*)(val+i));
 276         debug("\n");
 277 #endif
 278         off = fdt_node_offset_by_compatible(fdt, -1, compat);
 279         while (off != -FDT_ERR_NOTFOUND) {
 280                 if (create || (fdt_get_property(fdt, off, prop, 0) != NULL))
 281                         fdt_setprop(fdt, off, prop, val, len);
 282                 off = fdt_node_offset_by_compatible(fdt, off, compat);
 283         }
 284 }
 285
 286 void do_fixup_by_compat_u32(void *fdt, const char *compat,
 287                             const char *prop, u32 val, int create)
 288 {
 289         val = cpu_to_fdt32(val);
 290         do_fixup_by_compat(fdt, compat, prop, &val, 4, create);
 291 }
 292
 293 int fdt_fixup_memory(void *blob, u64 start, u64 size)
 294 {
 295         int err, nodeoffset, len = 0;
 296         u8 tmp[16];
 297         const u32 *addrcell, *sizecell;
 298
 299         err = fdt_check_header(blob);
 300         if (err < 0) {
 301                 printf("%s: %s\n", __FUNCTION__, fdt_strerror(err));
 302                 return err;
 303         }
 304
 305         /* update, or add and update /memory node */
 306         nodeoffset = fdt_path_offset(blob, "/memory");
 307         if (nodeoffset < 0) {
 308                 nodeoffset = fdt_add_subnode(blob, 0, "memory");
 309                 if (nodeoffset < 0)
 310                         printf("WARNING: could not create /memory: %s.\n",
 311                                         fdt_strerror(nodeoffset));
 312                 return nodeoffset;
 313         }
 314         err = fdt_setprop(blob, nodeoffset, "device_type", "memory",
 315                         sizeof("memory"));
 316         if (err < 0) {
 317                 printf("WARNING: could not set %s %s.\n", "device_type",
 318                                 fdt_strerror(err));
 319                 return err;
 320         }
 321
 322         addrcell = fdt_getprop(blob, 0, "#address-cells", NULL);
 323         /* use shifts and mask to ensure endianness */
 324         if ((addrcell) && (*addrcell == 2)) {
 325                 tmp[0] = (start >> 56) & 0xff;
 326                 tmp[1] = (start >> 48) & 0xff;
 327                 tmp[2] = (start >> 40) & 0xff;
 328                 tmp[3] = (start >> 32) & 0xff;
 329                 tmp[4] = (start >> 24) & 0xff;
 330                 tmp[5] = (start >> 16) & 0xff;
 331                 tmp[6] = (start >>  8) & 0xff;
 332                 tmp[7] = (start      ) & 0xff;
 333                 len = 8;
 334         } else {
 335                 tmp[0] = (start >> 24) & 0xff;
 336                 tmp[1] = (start >> 16) & 0xff;
 337                 tmp[2] = (start >>  8) & 0xff;
 338                 tmp[3] = (start      ) & 0xff;
 339                 len = 4;
 340         }
 341
 342         sizecell = fdt_getprop(blob, 0, "#size-cells", NULL);
 343         /* use shifts and mask to ensure endianness */
 344         if ((sizecell) && (*sizecell == 2)) {
 345                 tmp[0+len] = (size >> 56) & 0xff;
 346                 tmp[1+len] = (size >> 48) & 0xff;
 347                 tmp[2+len] = (size >> 40) & 0xff;
 348                 tmp[3+len] = (size >> 32) & 0xff;
 349                 tmp[4+len] = (size >> 24) & 0xff;
 350                 tmp[5+len] = (size >> 16) & 0xff;
 351                 tmp[6+len] = (size >>  8) & 0xff;
 352                 tmp[7+len] = (size      ) & 0xff;
 353                 len += 8;
 354         } else {
 355                 tmp[0+len] = (size >> 24) & 0xff;
 356                 tmp[1+len] = (size >> 16) & 0xff;
 357                 tmp[2+len] = (size >>  8) & 0xff;
 358                 tmp[3+len] = (size      ) & 0xff;
 359                 len += 4;
 360         }
 361
 362         err = fdt_setprop(blob, nodeoffset, "reg", tmp, len);
 363         if (err < 0) {
 364                 printf("WARNING: could not set %s %s.\n",
 365                                 "reg", fdt_strerror(err));
 366                 return err;
 367         }
 368         return 0;
 369 }
 370
 371 #if defined(CONFIG_HAS_ETH0) || defined(CONFIG_HAS_ETH1) ||\
 372     defined(CONFIG_HAS_ETH2) || defined(CONFIG_HAS_ETH3)
 373
 374 void fdt_fixup_ethernet(void *fdt, bd_t *bd)
 375 {
 376         int node;
 377         const char *path;
 378
 379         node = fdt_path_offset(fdt, "/aliases");
 380         if (node >= 0) {
 381 #if defined(CONFIG_HAS_ETH0)
 382                 path = fdt_getprop(fdt, node, "ethernet0", NULL);
 383                 if (path) {
 384                         do_fixup_by_path(fdt, path, "mac-address",
 385                                 bd->bi_enetaddr, 6, 0);
 386                         do_fixup_by_path(fdt, path, "local-mac-address",
 387                                 bd->bi_enetaddr, 6, 1);
 388                 }
 389 #endif
 390 #if defined(CONFIG_HAS_ETH1)
 391                 path = fdt_getprop(fdt, node, "ethernet1", NULL);
 392                 if (path) {
 393                         do_fixup_by_path(fdt, path, "mac-address",
 394                                 bd->bi_enet1addr, 6, 0);
 395                         do_fixup_by_path(fdt, path, "local-mac-address",
 396                                 bd->bi_enet1addr, 6, 1);
 397                 }
 398 #endif
 399 #if defined(CONFIG_HAS_ETH2)
 400                 path = fdt_getprop(fdt, node, "ethernet2", NULL);
 401                 if (path) {
 402                         do_fixup_by_path(fdt, path, "mac-address",
 403                                 bd->bi_enet2addr, 6, 0);
 404                         do_fixup_by_path(fdt, path, "local-mac-address",
 405                                 bd->bi_enet2addr, 6, 1);
 406                 }
 407 #endif
 408 #if defined(CONFIG_HAS_ETH3)
 409                 path = fdt_getprop(fdt, node, "ethernet3", NULL);
 410                 if (path) {
 411                         do_fixup_by_path(fdt, path, "mac-address",
 412                                 bd->bi_enet3addr, 6, 0);
 413                         do_fixup_by_path(fdt, path, "local-mac-address",
 414                                 bd->bi_enet3addr, 6, 1);
 415                 }
 416 #endif
 417         }
 418 }
 419 #endif
 420
 421 #ifdef CONFIG_HAS_FSL_DR_USB
 422 void fdt_fixup_dr_usb(void *blob, bd_t *bd)
 423 {
 424         char *mode;
 425         const char *compat = "fsl-usb2-dr";
 426         const char *prop = "dr_mode";
 427         int node_offset;
 428         int err;
 429
 430         mode = getenv("usb_dr_mode");
 431         if (!mode)
 432                 return;
 433
 434         node_offset = fdt_node_offset_by_compatible(blob, 0, compat);
 435         if (node_offset < 0)
 436                 printf("WARNING: could not find compatible node %s: %s.\n",
 437                         compat, fdt_strerror(node_offset));
 438
 439         err = fdt_setprop(blob, node_offset, prop, mode, strlen(mode) + 1);
 440         if (err < 0)
 441                 printf("WARNING: could not set %s for %s: %s.\n",
 442                        prop, compat, fdt_strerror(err));
 443 }
 444 #endif /* CONFIG_HAS_FSL_DR_USB */