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 int fdt_chosen(void *fdt, ulong initrd_start, ulong initrd_end, int force)
  48 {
  49         bd_t *bd = gd->bd;
  50         int   nodeoffset;
  51         int   err;
  52         u32   tmp;              /* used to set 32 bit integer properties */
  53         char  *str;             /* used to set string properties */
  54
  55         err = fdt_check_header(fdt);
  56         if (err < 0) {
  57                 printf("fdt_chosen: %s\n", fdt_strerror(err));
  58                 return err;
  59         }
  60
  61         if (initrd_start && initrd_end) {
  62                 struct fdt_reserve_entry re;
  63                 int  used;
  64                 int  total;
  65                 int  j;
  66
  67                 err = fdt_num_reservemap(fdt, &used, &total);
  68                 if (err < 0) {
  69                         printf("fdt_chosen: %s\n", fdt_strerror(err));
  70                         return err;
  71                 }
  72                 if (used >= total) {
  73                         printf("WARNING: "
  74                                 "no room in the reserved map (%d of %d)\n",
  75                                 used, total);
  76                         return -1;
  77                 }
  78                 /*
  79                  * Look for an existing entry and update it.  If we don't find
  80                  * the entry, we will j be the next available slot.
  81                  */
  82                 for (j = 0; j < used; j++) {
  83                         err = fdt_get_reservemap(fdt, j, &re);
  84                         if (re.address == initrd_start) {
  85                                 break;
  86                         }
  87                 }
  88                 err = fdt_replace_reservemap_entry(fdt, j,
  89                         initrd_start, initrd_end - initrd_start + 1);
  90                 if (err < 0) {
  91                         printf("fdt_chosen: %s\n", fdt_strerror(err));
  92                         return err;
  93                 }
  94         }
  95
  96         /*
  97          * Find the "chosen" node.
  98          */
  99         nodeoffset = fdt_find_node_by_path (fdt, "/chosen");
 100
 101         /*
 102          * If we have a "chosen" node already the "force the writing"
 103          * is not set, our job is done.
 104          */
 105         if ((nodeoffset >= 0) && !force)
 106                 return 0;
 107
 108         /*
 109          * No "chosen" node in the blob: create it.
 110          */
 111         if (nodeoffset < 0) {
 112                 /*
 113                  * Create a new node "/chosen" (offset 0 is root level)
 114                  */
 115                 nodeoffset = fdt_add_subnode(fdt, 0, "chosen");
 116                 if (nodeoffset < 0) {
 117                         printf("WARNING: could not create /chosen %s.\n",
 118                                 fdt_strerror(nodeoffset));
 119                         return nodeoffset;
 120                 }
 121         }
 122
 123         /*
 124          * Update pre-existing properties, create them if non-existant.
 125          */
 126         str = getenv("bootargs");
 127         if (str != NULL) {
 128                 err = fdt_setprop(fdt, nodeoffset,
 129                         "bootargs", str, strlen(str)+1);
 130                 if (err < 0)
 131                         printf("WARNING: could not set bootargs %s.\n",
 132                                 fdt_strerror(err));
 133         }
 134         if (initrd_start && initrd_end) {
 135                 tmp = __cpu_to_be32(initrd_start);
 136                 err = fdt_setprop(fdt, nodeoffset,
 137                          "linux,initrd-start", &tmp, sizeof(tmp));
 138                 if (err < 0)
 139                         printf("WARNING: "
 140                                 "could not set linux,initrd-start %s.\n",
 141                                 fdt_strerror(err));
 142                 tmp = __cpu_to_be32(initrd_end);
 143                 err = fdt_setprop(fdt, nodeoffset,
 144                         "linux,initrd-end", &tmp, sizeof(tmp));
 145                 if (err < 0)
 146                         printf("WARNING: could not set linux,initrd-end %s.\n",
 147                                 fdt_strerror(err));
 148         }
 149 #ifdef OF_STDOUT_PATH
 150         err = fdt_setprop(fdt, nodeoffset,
 151                 "linux,stdout-path", OF_STDOUT_PATH, strlen(OF_STDOUT_PATH)+1);
 152         if (err < 0)
 153                 printf("WARNING: could not set linux,stdout-path %s.\n",
 154                         fdt_strerror(err));
 155 #endif
 156
 157         return err;
 158 }
 159
 160 /********************************************************************/
 161
 162 #ifdef CONFIG_OF_HAS_UBOOT_ENV
 163
 164 /* Function that returns a character from the environment */
 165 extern uchar(*env_get_char) (int);
 166
 167
 168 int fdt_env(void *fdt)
 169 {
 170         int   nodeoffset;
 171         int   err;
 172         int   k, nxt;
 173         int i;
 174         static char tmpenv[256];
 175
 176         err = fdt_check_header(fdt);
 177         if (err < 0) {
 178                 printf("fdt_env: %s\n", fdt_strerror(err));
 179                 return err;
 180         }
 181
 182         /*
 183          * See if we already have a "u-boot-env" node, delete it if so.
 184          * Then create a new empty node.
 185          */
 186         nodeoffset = fdt_find_node_by_path (fdt, "/u-boot-env");
 187         if (nodeoffset >= 0) {
 188                 err = fdt_del_node(fdt, nodeoffset);
 189                 if (err < 0) {
 190                         printf("fdt_env: %s\n", fdt_strerror(err));
 191                         return err;
 192                 }
 193         }
 194         /*
 195          * Create a new node "/u-boot-env" (offset 0 is root level)
 196          */
 197         nodeoffset = fdt_add_subnode(fdt, 0, "u-boot-env");
 198         if (nodeoffset < 0) {
 199                 printf("WARNING: could not create /u-boot-env %s.\n",
 200                         fdt_strerror(nodeoffset));
 201                 return nodeoffset;
 202         }
 203
 204         for (i = 0; env_get_char(i) != '\0'; i = nxt + 1) {
 205                 char *s, *lval, *rval;
 206
 207                 /*
 208                  * Find the end of the name=definition
 209                  */
 210                 for (nxt = i; env_get_char(nxt) != '\0'; ++nxt)
 211                         ;
 212                 s = tmpenv;
 213                 for (k = i; k < nxt && s < &tmpenv[sizeof(tmpenv) - 1]; ++k)
 214                         *s++ = env_get_char(k);
 215                 *s++ = '\0';
 216                 lval = tmpenv;
 217                 /*
 218                  * Find the first '=': it separates the name from the value
 219                  */
 220                 s = strchr(tmpenv, '=');
 221                 if (s != NULL) {
 222                         *s++ = '\0';
 223                         rval = s;
 224                 } else
 225                         continue;
 226                 err = fdt_setprop(fdt, nodeoffset, lval, rval, strlen(rval)+1);
 227                 if (err < 0) {
 228                         printf("WARNING: could not set %s %s.\n",
 229                                 lval, fdt_strerror(err));
 230                         return err;
 231                 }
 232         }
 233         return 0;
 234 }
 235 #endif /* ifdef CONFIG_OF_HAS_UBOOT_ENV */
 236
 237 /********************************************************************/
 238
 239 #ifdef CONFIG_OF_HAS_BD_T
 240
 241 #define BDM(x)  {       .name = #x, .offset = offsetof(bd_t, bi_ ##x ) }
 242
 243 static const struct {
 244         const char *name;
 245         int offset;
 246 } bd_map[] = {
 247         BDM(memstart),
 248         BDM(memsize),
 249         BDM(flashstart),
 250         BDM(flashsize),
 251         BDM(flashoffset),
 252         BDM(sramstart),
 253         BDM(sramsize),
 254 #if defined(CONFIG_5xx) || defined(CONFIG_8xx) || defined(CONFIG_8260) \
 255         || defined(CONFIG_E500)
 256         BDM(immr_base),
 257 #endif
 258 #if defined(CONFIG_MPC5xxx)
 259         BDM(mbar_base),
 260 #endif
 261 #if defined(CONFIG_MPC83XX)
 262         BDM(immrbar),
 263 #endif
 264 #if defined(CONFIG_MPC8220)
 265         BDM(mbar_base),
 266         BDM(inpfreq),
 267         BDM(pcifreq),
 268         BDM(pevfreq),
 269         BDM(flbfreq),
 270         BDM(vcofreq),
 271 #endif
 272         BDM(bootflags),
 273         BDM(ip_addr),
 274         BDM(intfreq),
 275         BDM(busfreq),
 276 #ifdef CONFIG_CPM2
 277         BDM(cpmfreq),
 278         BDM(brgfreq),
 279         BDM(sccfreq),
 280         BDM(vco),
 281 #endif
 282 #if defined(CONFIG_MPC5xxx)
 283         BDM(ipbfreq),
 284         BDM(pcifreq),
 285 #endif
 286         BDM(baudrate),
 287 };
 288
 289
 290 int fdt_bd_t(void *fdt)
 291 {
 292         bd_t *bd = gd->bd;
 293         int   nodeoffset;
 294         int   err;
 295         u32   tmp;              /* used to set 32 bit integer properties */
 296         int i;
 297
 298         err = fdt_check_header(fdt);
 299         if (err < 0) {
 300                 printf("fdt_bd_t: %s\n", fdt_strerror(err));
 301                 return err;
 302         }
 303
 304         /*
 305          * See if we already have a "bd_t" node, delete it if so.
 306          * Then create a new empty node.
 307          */
 308         nodeoffset = fdt_find_node_by_path (fdt, "/bd_t");
 309         if (nodeoffset >= 0) {
 310                 err = fdt_del_node(fdt, nodeoffset);
 311                 if (err < 0) {
 312                         printf("fdt_bd_t: %s\n", fdt_strerror(err));
 313                         return err;
 314                 }
 315         }
 316         /*
 317          * Create a new node "/bd_t" (offset 0 is root level)
 318          */
 319         nodeoffset = fdt_add_subnode(fdt, 0, "bd_t");
 320         if (nodeoffset < 0) {
 321                 printf("WARNING: could not create /bd_t %s.\n",
 322                         fdt_strerror(nodeoffset));
 323                 printf("fdt_bd_t: %s\n", fdt_strerror(nodeoffset));
 324                 return nodeoffset;
 325         }
 326         /*
 327          * Use the string/pointer structure to create the entries...
 328          */
 329         for (i = 0; i < sizeof(bd_map)/sizeof(bd_map[0]); i++) {
 330                 tmp = cpu_to_be32(getenv("bootargs"));
 331                 err = fdt_setprop(fdt, nodeoffset,
 332                         bd_map[i].name, &tmp, sizeof(tmp));
 333                 if (err < 0)
 334                         printf("WARNING: could not set %s %s.\n",
 335                                 bd_map[i].name, fdt_strerror(err));
 336         }
 337         /*
 338          * Add a couple of oddball entries...
 339          */
 340         err = fdt_setprop(fdt, nodeoffset, "enetaddr", &bd->bi_enetaddr, 6);
 341         if (err < 0)
 342                 printf("WARNING: could not set enetaddr %s.\n",
 343                         fdt_strerror(err));
 344         err = fdt_setprop(fdt, nodeoffset, "ethspeed", &bd->bi_ethspeed, 4);
 345         if (err < 0)
 346                 printf("WARNING: could not set ethspeed %s.\n",
 347                         fdt_strerror(err));
 348         return 0;
 349 }
 350 #endif /* ifdef CONFIG_OF_HAS_BD_T */
 351
 352 #endif /* CONFIG_OF_LIBFDT */