board/karo/common/fdt.c

   1 /*
   2  * (C) Copyright 2012,2013 Lothar Waßmann <LW@KARO-electronics.de>
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  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 */
  17
  18 #include <common.h>
  19 #include <errno.h>
  20 #include <libfdt.h>
  21 #include <fdt_support.h>
  22 #include <nand.h>
  23 #include <mxcfb.h>
  24 #include <linux/list.h>
  25 #include <linux/fb.h>
  26 #include <jffs2/load_kernel.h>
  27 #include <malloc.h>
  28
  29 #include "karo.h"
  30
  31 #ifdef CONFIG_MAX_DTB_SIZE
  32 #define MAX_DTB_SIZE    CONFIG_MAX_DTB_SIZE
  33 #else
  34 #define MAX_DTB_SIZE    SZ_64K
  35 #endif
  36
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 static void karo_set_fdtsize(void *fdt)
  40 {
  41         char fdt_size[9];
  42         size_t fdtsize = getenv_ulong("fdtsize", 16, 0);
  43
  44         if (fdtsize == fdt_totalsize(fdt)) {
  45                 return;
  46         }
  47         debug("FDT size changed from %u to %u\n",
  48                 fdtsize, fdt_totalsize(fdt));
  49
  50         snprintf(fdt_size, sizeof(fdt_size), "%08x", fdt_totalsize(fdt));
  51         setenv("fdtsize", fdt_size);
  52 }
  53
  54 void karo_fdt_move_fdt(void)
  55 {
  56         void *fdt;
  57         unsigned long fdt_addr = getenv_ulong("fdtaddr", 16, 0);
  58
  59         if (working_fdt) {
  60                 debug("DTB already loaded\n");
  61                 return;
  62         }
  63
  64         if (!fdt_addr) {
  65                 fdt_addr = CONFIG_SYS_FDT_ADDR;
  66                 printf("fdtaddr is not set; using default: %08lx\n",
  67                         fdt_addr);
  68         }
  69
  70         fdt = karo_fdt_load_dtb();
  71         if (fdt == NULL) {
  72                 fdt = (void *)gd->fdt_blob;
  73                 if (fdt == NULL) {
  74 #ifdef CONFIG_OF_EMBED
  75                         printf("Compiled in FDT not found\n");
  76 #else
  77                         printf("No FDT found\n");
  78 #endif
  79                         return;
  80                 }
  81                 debug("Checking FDT header @ %p\n", fdt);
  82                 if (fdt_check_header(fdt)) {
  83                         printf("ERROR: No valid DTB found at %p\n", fdt);
  84                         return;
  85                 }
  86                 printf("No DTB in flash; using default DTB\n");
  87                 debug("Moving FDT from %p..%p to %08lx..%08lx\n",
  88                         fdt, fdt + fdt_totalsize(fdt) - 1,
  89                         fdt_addr, fdt_addr + fdt_totalsize(fdt) - 1);
  90                 memmove((void *)fdt_addr, fdt, fdt_totalsize(fdt));
  91         }
  92         set_working_fdt_addr((void *)fdt_addr);
  93         gd->fdt_blob = fdt;
  94         karo_set_fdtsize(fdt);
  95 }
  96
  97 void karo_fdt_remove_node(void *blob, const char *node)
  98 {
  99         int off = fdt_path_offset(blob, node);
 100         int ret;
 101
 102         debug("Removing node '%s' from DT\n", node);
 103
 104         if (off < 0) {
 105                 printf("Could not find node '%s': %d\n", node, off);
 106         } else {
 107                 ret = fdt_del_node(blob, off);
 108                 if (ret)
 109                         printf("Failed to remove node '%s': %d\n",
 110                                 node, ret);
 111         }
 112         karo_set_fdtsize(blob);
 113 }
 114
 115 void karo_fdt_enable_node(void *blob, const char *node, int enable)
 116 {
 117         int off = fdt_path_offset(blob, node);
 118
 119         debug("%sabling node '%s'\n", enable ? "En" : "Dis", node);
 120         if (off < 0) {
 121                 printf("Could not find node '%s': %d\n", node, off);
 122                 return;
 123         }
 124         fdt_set_node_status(blob, off,
 125                         enable ? FDT_STATUS_OKAY : FDT_STATUS_DISABLED, 0);
 126
 127         karo_set_fdtsize(blob);
 128 }
 129
 130 static const char *karo_touchpanels[] = {
 131         "ti,tsc2007",
 132         "edt,edt-ft5x06",
 133 #ifdef CONFIG_MX28
 134         "fsl,imx28-lradc",
 135 #endif
 136 };
 137
 138 static void fdt_disable_tp_node(void *blob, const char *name)
 139 {
 140         int offs = fdt_node_offset_by_compatible(blob, -1, name);
 141
 142         if (offs < 0) {
 143                 debug("node '%s' not found: %d\n", name, offs);
 144                 return;
 145         }
 146
 147         debug("Disabling node '%s'\n", name);
 148         fdt_set_node_status(blob, offs, FDT_STATUS_DISABLED, 0);
 149 }
 150
 151 void karo_fdt_fixup_touchpanel(void *blob)
 152 {
 153         int i;
 154         const char *model = getenv("touchpanel");
 155
 156         for (i = 0; i < ARRAY_SIZE(karo_touchpanels); i++) {
 157                 const char *tp = karo_touchpanels[i];
 158
 159                 if (model != NULL && strcmp(model, tp) == 0)
 160                         continue;
 161
 162                 if (model != NULL) {
 163                         if (strcmp(model, tp) == 0)
 164                                 continue;
 165                         tp = strchr(tp, ',');
 166                         if (tp != NULL && *tp != '\0' && strcmp(model, tp + 1) == 0)
 167                                 continue;
 168                 }
 169                 fdt_disable_tp_node(blob, karo_touchpanels[i]);
 170         }
 171         karo_set_fdtsize(blob);
 172 }
 173
 174 void karo_fdt_fixup_usb_otg(void *blob, const char *node, const char *phy)
 175 {
 176         const char *otg_mode = getenv("otg_mode");
 177         int off;
 178         int ret;
 179         const uint32_t *ph;
 180         int disable_otg = 0;
 181         int disable_phy_pins = 1;
 182
 183         debug("OTG mode is '%s'\n", otg_mode ? otg_mode : "<UNSET>");
 184
 185         off = fdt_path_offset(blob, node);
 186         if (off < 0) {
 187                 debug("Failed to find node %s\n", node);
 188                 return;
 189         }
 190
 191         if (otg_mode && (strcmp(otg_mode, "device") == 0 ||
 192                                 strcmp(otg_mode, "gadget") == 0)) {
 193                 debug("Setting dr_mode to 'peripheral'\n");
 194                 ret = fdt_setprop_string(blob, off, "dr_mode", "peripheral");
 195         } else if (otg_mode && strcmp(otg_mode, "host") == 0) {
 196                 debug("Setting dr_mode to 'host'\n");
 197                 ret = fdt_setprop_string(blob, off, "dr_mode", "host");
 198                 disable_phy_pins = 0;
 199         } else if (otg_mode && strcmp(otg_mode, "otg") == 0) {
 200                 debug("Setting dr_mode to 'host'\n");
 201                 ret = fdt_setprop_string(blob, off, "dr_mode", "otg");
 202         } else {
 203                 if (otg_mode && strcmp(otg_mode, "none") != 0)
 204                         printf("Invalid 'otg_mode' setting '%s'; disabling usbotg port\n",
 205                                 otg_mode);
 206                 disable_otg = 1;
 207                 ret = 0;
 208         }
 209
 210         if ((!disable_phy_pins && !disable_otg) || ret)
 211                 goto out;
 212
 213         if (disable_otg) {
 214                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 215                 if (ret)
 216                         goto out;
 217         }
 218
 219         ph = fdt_getprop(blob, off, phy, NULL);
 220         if (ph == NULL) {
 221                 printf("Failed to find '%s' phandle in node '%s'\n", phy,
 222                         fdt_get_name(blob, off, NULL));
 223                 goto out;
 224         }
 225
 226         off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 227         if (off <= 0) {
 228                 printf("Failed to find '%s' node via phandle %04x\n",
 229                         phy, fdt32_to_cpu(*ph));
 230                 goto out;
 231         }
 232
 233         if (disable_otg) {
 234                 debug("Disabling usbphy\n");
 235                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 236         }
 237 out:
 238         if (ret)
 239                 printf("Failed to update usbotg: %d\n", ret);
 240         else
 241                 debug("node '%s' updated\n", node);
 242         karo_set_fdtsize(blob);
 243 }
 244
 245 static int karo_fdt_flexcan_enabled(void *blob)
 246 {
 247         const char *can_ifs[] = {
 248                 "can0",
 249                 "can1",
 250         };
 251         size_t i;
 252
 253         for (i = 0; i < ARRAY_SIZE(can_ifs); i++) {
 254                 const char *status;
 255                 int off = fdt_path_offset(blob, can_ifs[i]);
 256
 257                 if (off < 0) {
 258                         debug("node '%s' not found\n", can_ifs[i]);
 259                         continue;
 260                 }
 261                 status = fdt_getprop(blob, off, "status", NULL);
 262                 if (status && strcmp(status, "okay") == 0) {
 263                         debug("%s is enabled\n", can_ifs[i]);
 264                         return 1;
 265                 }
 266         }
 267         debug("can driver is disabled\n");
 268         return 0;
 269 }
 270
 271 static void karo_fdt_set_lcd_pins(void *blob, const char *name)
 272 {
 273         int off = fdt_path_offset(blob, name);
 274         u32 ph;
 275         const struct fdt_property *pc;
 276         int len;
 277
 278         if (off < 0)
 279                 return;
 280
 281         ph = fdt_create_phandle(blob, off);
 282         if (!ph)
 283                 return;
 284
 285         off = fdt_path_offset(blob, "display");
 286         if (off < 0)
 287                 return;
 288
 289         pc = fdt_get_property(blob, off, "pinctrl-0", &len);
 290         if (!pc || len < sizeof(ph))
 291                 return;
 292
 293         memcpy((void *)pc->data, &ph, sizeof(ph));
 294         fdt_setprop_cell(blob, off, "pinctrl-0", ph);
 295 }
 296
 297 void karo_fdt_fixup_flexcan(void *blob, int xcvr_present)
 298 {
 299         const char *xcvr_status = "disabled";
 300
 301         if (xcvr_present) {
 302                 if (karo_fdt_flexcan_enabled(blob)) {
 303                         karo_fdt_set_lcd_pins(blob, "lcdif_23bit_pins_a");
 304                         xcvr_status = "okay";
 305                 } else {
 306                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 307                 }
 308         } else {
 309                 const char *otg_mode = getenv("otg_mode");
 310
 311                 if (otg_mode && (strcmp(otg_mode, "host") == 0))
 312                         karo_fdt_enable_node(blob, "can1", 0);
 313
 314                 karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 315         }
 316         fdt_find_and_setprop(blob, "/regulators/can-xcvr", "status",
 317                         xcvr_status, strlen(xcvr_status) + 1, 1);
 318 }
 319
 320 void karo_fdt_del_prop(void *blob, const char *compat, phys_addr_t offs,
 321                         const char *prop)
 322 {
 323         int ret;
 324         int offset;
 325         const uint32_t *phandle;
 326         uint32_t ph = 0;
 327
 328         offset = fdt_node_offset_by_compat_reg(blob, compat, offs);
 329         if (offset <= 0)
 330                 return;
 331
 332         phandle = fdt_getprop(blob, offset, prop, NULL);
 333         if (phandle) {
 334                 ph = fdt32_to_cpu(*phandle);
 335         }
 336
 337         debug("Removing property '%s' from node %s@%08lx\n", prop, compat, offs);
 338         ret = fdt_delprop(blob, offset, prop);
 339         if (ret == 0)
 340                 karo_set_fdtsize(blob);
 341
 342         if (!ph)
 343                 return;
 344
 345         offset = fdt_node_offset_by_phandle(blob, ph);
 346         if (offset <= 0)
 347                 return;
 348
 349         debug("Removing node @ %08x\n", offset);
 350         fdt_del_node(blob, offset);
 351         karo_set_fdtsize(blob);
 352 }
 353
 354 static int fdt_init_fb_mode(const void *blob, int off, struct fb_videomode *fb_mode)
 355 {
 356         const uint32_t *prop;
 357
 358         memset(fb_mode, 0, sizeof(*fb_mode));
 359
 360         prop = fdt_getprop(blob, off, "clock-frequency", NULL);
 361         if (prop)
 362                 fb_mode->pixclock = KHZ2PICOS(fdt32_to_cpu(*prop) / 1000);
 363
 364         prop = fdt_getprop(blob, off, "hactive", NULL);
 365         if (prop)
 366                 fb_mode->xres = fdt32_to_cpu(*prop);
 367
 368         prop = fdt_getprop(blob, off, "vactive", NULL);
 369         if (prop)
 370                 fb_mode->yres = fdt32_to_cpu(*prop);
 371
 372         prop = fdt_getprop(blob, off, "hback-porch", NULL);
 373         if (prop)
 374                 fb_mode->left_margin = fdt32_to_cpu(*prop);
 375
 376         prop = fdt_getprop(blob, off, "hsync-len", NULL);
 377         if (prop)
 378                 fb_mode->hsync_len = fdt32_to_cpu(*prop);
 379
 380         prop = fdt_getprop(blob, off, "hfront-porch", NULL);
 381         if (prop)
 382                 fb_mode->right_margin = fdt32_to_cpu(*prop);
 383
 384         prop = fdt_getprop(blob, off, "vback-porch", NULL);
 385         if (prop)
 386                 fb_mode->upper_margin = fdt32_to_cpu(*prop);
 387
 388         prop = fdt_getprop(blob, off, "vsync-len", NULL);
 389         if (prop)
 390                 fb_mode->vsync_len = fdt32_to_cpu(*prop);
 391
 392         prop = fdt_getprop(blob, off, "vfront-porch", NULL);
 393         if (prop)
 394                 fb_mode->lower_margin = fdt32_to_cpu(*prop);
 395
 396         prop = fdt_getprop(blob, off, "hsync-active", NULL);
 397         if (prop)
 398                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 399
 400         prop = fdt_getprop(blob, off, "vsync-active", NULL);
 401         if (prop)
 402                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 403
 404         prop = fdt_getprop(blob, off, "de-active", NULL);
 405         if (prop)
 406                 fb_mode->sync |= *prop ? 0 : FB_SYNC_OE_LOW_ACT;
 407
 408         prop = fdt_getprop(blob, off, "pixelclk-active", NULL);
 409         if (prop)
 410                 fb_mode->sync |= *prop ? 0 : FB_SYNC_CLK_LAT_FALL;
 411
 412         return 0;
 413 }
 414
 415 static int fdt_update_native_fb_mode(void *blob, int off)
 416 {
 417         int ret;
 418         uint32_t ph;
 419
 420         ret = fdt_increase_size(blob, 64);
 421         if (ret) {
 422                 printf("Warning: Failed to increase FDT size: %d\n", ret);
 423         }
 424         debug("Creating phandle at offset %d\n", off);
 425         ph = fdt_create_phandle(blob, off);
 426         if (!ph) {
 427                 printf("Failed to create phandle for video timing\n");
 428                 return -ENOMEM;
 429         }
 430
 431         debug("phandle of %s @ %06x=%04x\n", fdt_get_name(blob, off, NULL),
 432                 off, ph);
 433         off = fdt_parent_offset(blob, off);
 434         if (off < 0)
 435                 return off;
 436         debug("parent offset=%06x\n", off);
 437         ret = fdt_setprop_cell(blob, off, "native-mode", ph);
 438         if (ret)
 439                 printf("Failed to set property 'native-mode': %d\n", ret);
 440         karo_set_fdtsize(blob);
 441         return ret;
 442 }
 443
 444 static int karo_fdt_find_video_timings(void *blob)
 445 {
 446         int off = fdt_path_offset(blob, "display");
 447         const char *subnode = "display-timings";
 448
 449         if (off < 0) {
 450                 debug("Could not find node 'display' in FDT: %d\n", off);
 451                 return off;
 452         }
 453
 454         off = fdt_subnode_offset(blob, off, subnode);
 455         if (off < 0) {
 456                 debug("Could not find node '%s' in FDT: %d\n", subnode, off);
 457         }
 458         return off;
 459 }
 460
 461 int karo_fdt_get_fb_mode(void *blob, const char *name, struct fb_videomode *fb_mode)
 462 {
 463         int off = karo_fdt_find_video_timings(blob);
 464
 465         if (off < 0)
 466                 return off;
 467         while (off > 0) {
 468                 const char *n, *endp;
 469                 int len, d = 1;
 470
 471                 off = fdt_next_node(blob, off, &d);
 472                 if (off < 0)
 473                         return off;
 474                 if (d < 1)
 475                         return -EINVAL;
 476                 if (d > 2) {
 477                         debug("Skipping node @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 478                         continue;
 479                 }
 480                 debug("parsing subnode @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 481
 482                 n = fdt_getprop(blob, off, "panel-name", &len);
 483                 if (!n) {
 484                         n = fdt_get_name(blob, off, NULL);
 485                         if (strcasecmp(n, name) == 0) {
 486                                 break;
 487                         }
 488                 } else {
 489                         int found = 0;
 490
 491                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 492                                 debug("Checking panel-name '%s'\n", n);
 493                                 if (strcasecmp(n, name) == 0) {
 494                                         debug("Using node %s @ %04x\n",
 495                                                 fdt_get_name(blob, off, NULL), off);
 496                                         found = 1;
 497                                         break;
 498                                 }
 499                         }
 500                         if (found)
 501                                 break;
 502                 }
 503         }
 504         if (off > 0) {
 505                 return fdt_init_fb_mode(blob, off, fb_mode);
 506         }
 507         return -EINVAL;
 508 }
 509
 510 #define SET_FB_PROP(n, v) ({                                            \
 511         int ret;                                                        \
 512         ret = fdt_setprop_u32(blob, off, n, v);                         \
 513         if (ret) {                                                      \
 514                 printf("Failed to set property %s: %d\n", name, ret);   \
 515         }                                                               \
 516         ret;                                                            \
 517 })
 518
 519
 520 int karo_fdt_create_fb_mode(void *blob, const char *name,
 521                         struct fb_videomode *fb_mode)
 522 {
 523         int off = fdt_path_offset(blob, "display");
 524         int ret;
 525         const char *subnode = "display-timings";
 526
 527         if (off < 0) {
 528                 printf("'display' node not found in FDT\n");
 529                 return off;
 530         }
 531
 532         ret = fdt_increase_size(blob, 512);
 533         if (ret) {
 534                 printf("Failed to increase FDT size: %d\n", ret);
 535                 return ret;
 536         }
 537
 538         ret = fdt_subnode_offset(blob, off, subnode);
 539         if (ret < 0) {
 540                 debug("Could not find node '%s' in FDT: %d\n", subnode, ret);
 541                 ret = fdt_add_subnode(blob, off, subnode);
 542                 if (ret < 0) {
 543                         printf("Failed to add %s subnode: %d\n", subnode, ret);
 544                         return ret;
 545                 }
 546         }
 547
 548         ret = fdt_add_subnode(blob, ret, name);
 549         if (ret < 0) {
 550                 printf("Failed to add %s subnode: %d\n", name, ret);
 551                 return ret;
 552         }
 553         off = ret;
 554
 555         ret = SET_FB_PROP("clock-frequency",
 556                         PICOS2KHZ(fb_mode->pixclock) * 1000);
 557         if (ret)
 558                 goto out;
 559         ret = SET_FB_PROP("hactive", fb_mode->xres);
 560         if (ret)
 561                 goto out;
 562         ret = SET_FB_PROP("vactive", fb_mode->yres);
 563         if (ret)
 564                 goto out;
 565         ret = SET_FB_PROP("hback-porch", fb_mode->left_margin);
 566         if (ret)
 567                 goto out;
 568         ret = SET_FB_PROP("hsync-len", fb_mode->hsync_len);
 569         if (ret)
 570                 goto out;
 571         ret = SET_FB_PROP("hfront-porch", fb_mode->right_margin);
 572         if (ret)
 573                 goto out;
 574         ret = SET_FB_PROP("vback-porch", fb_mode->upper_margin);
 575         if (ret)
 576                 goto out;
 577         ret = SET_FB_PROP("vsync-len", fb_mode->vsync_len);
 578         if (ret)
 579                 goto out;
 580         ret = SET_FB_PROP("vfront-porch", fb_mode->lower_margin);
 581         if (ret)
 582                 goto out;
 583         ret = SET_FB_PROP("hsync-active",
 584                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 585         if (ret)
 586                 goto out;
 587         ret = SET_FB_PROP("vsync-active",
 588                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 589         if (ret)
 590                 goto out;
 591         ret = SET_FB_PROP("de-active",
 592                         !(fb_mode->sync & FB_SYNC_OE_LOW_ACT));
 593         if (ret)
 594                 goto out;
 595         ret = SET_FB_PROP("pixelclk-active",
 596                         !(fb_mode->sync & FB_SYNC_CLK_LAT_FALL));
 597 out:
 598         karo_set_fdtsize(blob);
 599         return ret;
 600 }
 601
 602 static int karo_fdt_set_display_alias(void *blob, const char *path,
 603                                 const char *name)
 604 {
 605         int ret;
 606         int off;
 607         size_t size = strlen(path) + strlen(name) + 2;
 608         char *display;
 609
 610         display = malloc(size);
 611         if (display == NULL) {
 612                 printf("%s: Failed to allocate buffer\n", __func__);
 613                 return -ENOMEM;
 614         }
 615         sprintf(display, "%s/%s", path, name);
 616         if (strlen(display) != size - 1)
 617                 hang();
 618         off = fdt_path_offset(blob, "/aliases");
 619         if (off == FDT_ERR_BADMAGIC)
 620                 return -EINVAL;
 621         ret = fdt_resize(blob);
 622         if (ret < 0) {
 623                 printf("%s: Failed to resize FDT: %s\n",
 624                         __func__, fdt_strerror(ret));
 625         }
 626         if (off < 0) {
 627                 off = fdt_add_subnode(blob, 0, "aliases");
 628                 if (off < 0) {
 629                         printf("%s: Failed to create 'aliases' node: %s\n",
 630                                 __func__, fdt_strerror(off));
 631                         return off;
 632                 }
 633         }
 634         ret = fdt_setprop_string(blob, off, "display", display);
 635         debug("setprop_string(display='%s') returned %d\n", display, ret);
 636         return ret;
 637 }
 638
 639 const char *karo_fdt_set_display(const char *video_mode, const char *lcd_path,
 640                                 const char *lvds_path)
 641 {
 642         const char *vmode = NULL;
 643         int ret;
 644         void *blob = working_fdt;
 645
 646         if (video_mode == NULL || strlen(video_mode) == 0)
 647                 return NULL;
 648
 649         vmode = strchr(video_mode, ':');
 650
 651         if (lvds_path == NULL)
 652                 return vmode ? vmode + 1 : video_mode;
 653
 654         if (lvds_path != NULL && vmode != NULL) {
 655                 if (strncmp(video_mode, "LVDS:", 5) == 0 ||
 656                         strncmp(video_mode, "LVDS0:", 6) == 0) {
 657                         ret = karo_fdt_set_display_alias(blob, lvds_path,
 658                                                         "lvds-channel@0");
 659                 } else if (strncmp(video_mode, "LVDS1:", 6) == 0) {
 660                         ret = karo_fdt_set_display_alias(blob, lvds_path,
 661                                                         "lvds-channel@1");
 662                 } else {
 663                         debug("%s: Syntax error in video_mode\n", __func__);
 664                         return vmode + 1;
 665                 }
 666                 video_mode = vmode + 1;
 667         } else {
 668                 int off;
 669
 670                 ret = karo_fdt_set_display_alias(blob, lcd_path,
 671                                                 "display@di0");
 672
 673                 off = fdt_path_offset(blob, "lvds0");
 674                 if (off >= 0) {
 675                         ret = fdt_set_node_status(blob, off,
 676                                                 FDT_STATUS_DISABLED, 0);
 677                 }
 678                 off = fdt_path_offset(blob, "lvds1");
 679                 if (off >= 0) {
 680                         ret = fdt_set_node_status(blob, off,
 681                                                 FDT_STATUS_DISABLED, 0);
 682                 }
 683         }
 684         if (ret) {
 685                 printf("%s: failed to set 'display' alias: %s\n",
 686                         __func__, fdt_strerror(ret));
 687         }
 688         return video_mode;
 689 }
 690
 691 int karo_fdt_update_fb_mode(void *blob, const char *name)
 692 {
 693         int off = fdt_path_offset(blob, "display");
 694         const char *subnode = "display-timings";
 695
 696         if (off < 0)
 697                 return off;
 698
 699         if (name == NULL) {
 700                 int ret;
 701
 702                 debug("Disabling node '%s' at %03x\n",
 703                         fdt_get_name(blob, off, NULL), off);
 704                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 705                 return ret;
 706         }
 707
 708         off = fdt_subnode_offset(blob, off, subnode);
 709         if (off < 0) {
 710                 debug("Could not find node '%s' in FDT: %d\n", subnode, off);
 711                 return off;
 712         }
 713         while (off > 0) {
 714                 const char *n, *endp;
 715                 int len, d = 1;
 716
 717                 off = fdt_next_node(blob, off, &d);
 718                 if (off < 0)
 719                         return off;
 720                 if (d < 1)
 721                         return -EINVAL;
 722                 if (d > 2) {
 723                         debug("Skipping node @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 724                         continue;
 725                 }
 726                 debug("parsing subnode @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 727
 728                 n = fdt_getprop(blob, off, "panel-name", &len);
 729                 if (!n) {
 730                         n = fdt_get_name(blob, off, NULL);
 731                         if (strcasecmp(n, name) == 0) {
 732                                 break;
 733                         }
 734                 } else {
 735                         int found = 0;
 736
 737                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 738                                 debug("Checking panel-name '%s'\n", n);
 739                                 if (strcasecmp(n, name) == 0) {
 740                                         debug("Using node %s @ %04x\n",
 741                                                 fdt_get_name(blob, off, NULL), off);
 742                                         found = 1;
 743                                         break;
 744                                 }
 745                         }
 746                         if (found)
 747                                 break;
 748                 }
 749         }
 750         if (off > 0)
 751                 return fdt_update_native_fb_mode(blob, off);
 752         return off;
 753 }
 754
 755 static int karo_load_part(const char *part, void *addr, size_t len)
 756 {
 757         int ret;
 758         struct mtd_device *dev;
 759         struct part_info *part_info;
 760         u8 part_num;
 761         size_t actual;
 762
 763         debug("Initializing mtd_parts\n");
 764         ret = mtdparts_init();
 765         if (ret)
 766                 return ret;
 767
 768         debug("Trying to find NAND partition '%s'\n", part);
 769         ret = find_dev_and_part(part, &dev, &part_num, &part_info);
 770         if (ret) {
 771                 printf("Failed to find flash partition '%s': %d\n",
 772                         part, ret);
 773
 774                 return ret;
 775         }
 776         debug("Found partition '%s': offset=%08x size=%08x\n",
 777                 part, part_info->offset, part_info->size);
 778         if (part_info->size < len) {
 779                 printf("Warning: partition '%s' smaller than requested size: %u; truncating data to %u byte\n",
 780                         part, len, part_info->size);
 781                 len = part_info->size;
 782         }
 783         debug("Reading NAND partition '%s' to %p\n", part, addr);
 784         ret = nand_read_skip_bad(&nand_info[0], part_info->offset, &len,
 785                                 &actual, len, addr);
 786         if (ret) {
 787                 printf("Failed to load partition '%s' to %p\n", part, addr);
 788                 return ret;
 789         }
 790         if (actual < len)
 791                 printf("Read only %u of %u bytes due to bad blocks\n",
 792                         actual, len);
 793
 794         debug("Read %u byte from partition '%s' @ offset %08x\n",
 795                 len, part, part_info->offset);
 796         return 0;
 797 }
 798
 799 void *karo_fdt_load_dtb(void)
 800 {
 801         int ret;
 802         void *fdt = (void *)getenv_ulong("fdtaddr", 16, CONFIG_SYS_FDT_ADDR);
 803
 804         if (tstc()) {
 805                 debug("aborting DTB load\n");
 806                 return NULL;
 807         }
 808
 809         /* clear FDT header in memory */
 810         memset(fdt, 0, 4);
 811
 812         ret = karo_load_part("dtb", fdt, MAX_DTB_SIZE);
 813         if (ret) {
 814                 printf("Failed to load dtb from flash: %d\n", ret);
 815                 return NULL;
 816         }
 817
 818         if (fdt_check_header(fdt)) {
 819                 debug("No valid DTB in flash\n");
 820                 return NULL;
 821         }
 822         debug("Using DTB from flash\n");
 823         karo_set_fdtsize(fdt);
 824         return fdt;
 825 }