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         size_t fdtsize = getenv_ulong("fdtsize", 16, 0);
  42
  43         if (fdtsize == fdt_totalsize(fdt)) {
  44                 return;
  45         }
  46         debug("FDT size changed from %u to %u\n",
  47                 fdtsize, fdt_totalsize(fdt));
  48         setenv_hex("fdtsize", fdt_totalsize(fdt));
  49 }
  50
  51 static void *karo_fdt_load_dtb(void)
  52 {
  53         int ret;
  54         void *fdt = (void *)getenv_ulong("fdtaddr", 16, CONFIG_SYS_FDT_ADDR);
  55
  56         if (had_ctrlc()) {
  57                 printf("aborting DTB load\n");
  58                 return NULL;
  59         }
  60
  61         /* clear FDT header in memory */
  62         memset(fdt, 0, 4);
  63
  64         ret = karo_load_part("dtb", fdt, MAX_DTB_SIZE);
  65         if (ret) {
  66                 printf("Failed to load dtb from flash: %d\n", ret);
  67                 return NULL;
  68         }
  69
  70         if (fdt_check_header(fdt)) {
  71                 debug("No valid DTB in flash\n");
  72                 return NULL;
  73         }
  74         debug("Using DTB from flash\n");
  75         karo_set_fdtsize(fdt);
  76         return fdt;
  77 }
  78
  79 void karo_fdt_move_fdt(void)
  80 {
  81         void *fdt;
  82         unsigned long fdt_addr = getenv_ulong("fdtaddr", 16, 0);
  83
  84         if (working_fdt) {
  85                 debug("DTB already loaded\n");
  86                 return;
  87         }
  88
  89         setenv("fdtsize", 0);
  90
  91         if (!fdt_addr) {
  92                 fdt_addr = CONFIG_SYS_FDT_ADDR;
  93                 printf("fdtaddr is not set; using default: %08lx\n",
  94                         fdt_addr);
  95         }
  96
  97         fdt = karo_fdt_load_dtb();
  98         if (fdt == NULL) {
  99                 fdt = (void *)gd->fdt_blob;
 100                 if (fdt == NULL) {
 101 #ifdef CONFIG_OF_EMBED
 102                         printf("Compiled in FDT not found");
 103 #else
 104                         printf("No FDT found");
 105 #endif
 106                         printf("; creating empty DTB\n");
 107                         fdt = (void *)fdt_addr;
 108                         fdt_create_empty_tree(fdt, 256);
 109                 } else {
 110                         printf("No DTB in flash; using default DTB\n");
 111                 }
 112                 debug("Checking FDT header @ %p\n", fdt);
 113                 if (fdt_check_header(fdt)) {
 114                         printf("ERROR: No valid DTB found at %p\n", fdt);
 115                         return;
 116                 }
 117                 debug("Moving FDT from %p..%p to %08lx..%08lx\n",
 118                         fdt, fdt + fdt_totalsize(fdt) - 1,
 119                         fdt_addr, fdt_addr + fdt_totalsize(fdt) - 1);
 120                 memmove((void *)fdt_addr, fdt, fdt_totalsize(fdt));
 121         }
 122         set_working_fdt_addr((void *)fdt_addr);
 123         gd->fdt_blob = fdt;
 124         karo_set_fdtsize(fdt);
 125 }
 126
 127 void karo_fdt_remove_node(void *blob, const char *node)
 128 {
 129         int off = fdt_path_offset(blob, node);
 130         int ret;
 131
 132         debug("Removing node '%s' from DT\n", node);
 133
 134         if (off < 0) {
 135                 printf("Could not find node '%s': %s\n", node,
 136                         fdt_strerror(off));
 137         } else {
 138                 ret = fdt_del_node(blob, off);
 139                 if (ret)
 140                         printf("Failed to remove node '%s': %s\n",
 141                                 node, fdt_strerror(ret));
 142         }
 143         karo_set_fdtsize(blob);
 144 }
 145
 146 void karo_fdt_enable_node(void *blob, const char *node, int enable)
 147 {
 148         int off = fdt_path_offset(blob, node);
 149
 150         debug("%sabling node '%s'\n", enable ? "En" : "Dis", node);
 151         if (off < 0) {
 152                 printf("Could not find node '%s': %s\n", node,
 153                         fdt_strerror(off));
 154                 return;
 155         }
 156         fdt_set_node_status(blob, off,
 157                         enable ? FDT_STATUS_OKAY : FDT_STATUS_DISABLED, 0);
 158
 159         karo_set_fdtsize(blob);
 160 }
 161
 162 static void fdt_disable_tp_node(void *blob, const char *name)
 163 {
 164         int offs = fdt_node_offset_by_compatible(blob, -1, name);
 165
 166         while (offs >= 0) {
 167                 debug("Disabling node '%s'\n", name);
 168                 fdt_set_node_status(blob, offs, FDT_STATUS_DISABLED, 0);
 169                 offs = fdt_node_offset_by_compatible(blob, offs, name);
 170         }
 171 }
 172
 173 void karo_fdt_fixup_touchpanel(void *blob, const char *panels[],
 174                         size_t num_panels)
 175 {
 176         int i;
 177         const char *model = getenv("touchpanel");
 178
 179         for (i = 0; i < num_panels; i++) {
 180                 const char *tp = panels[i];
 181
 182                 if (model != NULL) {
 183                         if (strcmp(model, tp) == 0)
 184                                 continue;
 185                         while (tp != NULL) {
 186                                 if (*tp != '\0' && strcmp(model, tp + 1) == 0)
 187                                         break;
 188                                 tp = strpbrk(tp + 1, ",-");
 189                         }
 190                         if (tp != NULL)
 191                                 continue;
 192                 }
 193                 fdt_disable_tp_node(blob, panels[i]);
 194         }
 195         karo_set_fdtsize(blob);
 196 }
 197
 198 static int karo_fdt_disable_node_phandle(void *blob, const char *parent,
 199                                         const char *name)
 200 {
 201         const uint32_t *ph;
 202         int off;
 203
 204         off = fdt_path_offset(blob, parent);
 205         if (off < 0) {
 206                 printf("Failed to find node '%s'\n", parent);
 207                 return off;
 208         }
 209
 210         ph = fdt_getprop(blob, off, name, NULL);
 211         if (ph == NULL) {
 212                 debug("Failed to find '%s' phandle in node '%s'\n", name,
 213                         fdt_get_name(blob, off, NULL));
 214                 return -FDT_ERR_NOTFOUND;
 215         }
 216
 217         off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 218         if (off <= 0) {
 219                 printf("Failed to find '%s' node via phandle %04x\n",
 220                         name, fdt32_to_cpu(*ph));
 221                 return -FDT_ERR_NOTFOUND;
 222         }
 223         return fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 224 }
 225
 226 void karo_fdt_fixup_usb_otg(void *blob, const char *node, const char *phy,
 227                         const char *phy_supply)
 228 {
 229         const char *otg_mode = getenv("otg_mode");
 230         int off;
 231         int ret;
 232         int disable_otg = 0;
 233         int disable_phy_pins = 0;
 234
 235         debug("OTG mode is '%s'\n", otg_mode ? otg_mode : "<UNSET>");
 236
 237         off = fdt_path_offset(blob, node);
 238         if (off < 0) {
 239                 debug("Failed to find node %s\n", node);
 240                 return;
 241         }
 242
 243         if (otg_mode && (strcasecmp(otg_mode, "device") == 0 ||
 244                                 strcasecmp(otg_mode, "gadget") == 0)) {
 245                 debug("Setting dr_mode to 'peripheral'\n");
 246                 ret = fdt_setprop_string(blob, off, "dr_mode", "peripheral");
 247                 disable_phy_pins = 1;
 248         } else if (otg_mode && strcasecmp(otg_mode, "host") == 0) {
 249                 debug("Setting dr_mode to 'host'\n");
 250                 ret = fdt_setprop_string(blob, off, "dr_mode", "host");
 251         } else if (otg_mode && strcasecmp(otg_mode, "otg") == 0) {
 252                 debug("Setting dr_mode to 'otg'\n");
 253                 ret = fdt_setprop_string(blob, off, "dr_mode", "otg");
 254         } else {
 255                 if (otg_mode && strcasecmp(otg_mode, "none") != 0)
 256                         printf("Invalid 'otg_mode' setting '%s'; disabling usbotg port\n",
 257                                 otg_mode);
 258                 disable_otg = 1;
 259                 ret = 0;
 260         }
 261
 262         if ((!disable_phy_pins && !disable_otg) || ret)
 263                 goto out;
 264
 265         ret = karo_fdt_disable_node_phandle(blob, node, phy_supply);
 266         if (ret && ret == -FDT_ERR_NOTFOUND) {
 267                 const uint32_t *ph;
 268
 269                 ph = fdt_getprop(blob, off, phy, NULL);
 270                 if (ph == NULL) {
 271                         printf("Failed to find '%s' phandle in node '%s'\n",
 272                                 phy, node);
 273                         ret = -FDT_ERR_NOTFOUND;
 274                         goto out;
 275                 }
 276                 off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 277                 if (off < 0) {
 278                         printf("Failed to find '%s' node via phandle %04x\n",
 279                                 phy, fdt32_to_cpu(*ph));
 280                         ret = off;
 281                         goto out;
 282                 }
 283                 ph = fdt_getprop(blob, off, phy_supply, NULL);
 284                 if (ph == NULL) {
 285                         debug("Failed to find '%s' phandle in node '%s'\n",
 286                                 phy_supply, fdt_get_name(blob, off, NULL));
 287                         ret = -FDT_ERR_NOTFOUND;
 288                         goto disable_otg;
 289                 }
 290                 ret = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 291                 if (ret > 0) {
 292                         debug("Disabling node %s via phandle %s:%s\n",
 293                                 fdt_get_name(blob, ret, NULL),
 294                                 fdt_get_name(blob, off, NULL), phy_supply);
 295                         ret = fdt_set_node_status(blob, ret,
 296                                                 FDT_STATUS_DISABLED, 0);
 297                 }
 298         }
 299         if (ret && ret != -FDT_ERR_NOTFOUND)
 300                 goto out;
 301
 302 disable_otg:
 303         if (disable_otg) {
 304                 debug("Disabling '%s'\n", fdt_get_name(blob, off, NULL));
 305                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 306                 if (ret > 0)
 307                         ret = karo_fdt_disable_node_phandle(blob, node, phy);
 308         } else if (disable_phy_pins) {
 309                 debug("Removing '%s' from node '%s'\n", phy_supply,
 310                         fdt_get_name(blob, off, NULL));
 311                 ret = fdt_delprop(blob, off, phy_supply);
 312         }
 313
 314 out:
 315         if (ret && ret != -FDT_ERR_NOTFOUND)
 316                 printf("Failed to update usbotg: %s\n", fdt_strerror(ret));
 317         else
 318                 debug("node '%s' updated\n", node);
 319         karo_set_fdtsize(blob);
 320 }
 321
 322 static inline int karo_fdt_flexcan_enabled(void *blob)
 323 {
 324         static const char *can_ifs[] = {
 325                 "can0",
 326                 "can1",
 327         };
 328         size_t i;
 329
 330         for (i = 0; i < ARRAY_SIZE(can_ifs); i++) {
 331                 const char *status;
 332                 int off = fdt_path_offset(blob, can_ifs[i]);
 333
 334                 if (off < 0) {
 335                         debug("node '%s' not found\n", can_ifs[i]);
 336                         continue;
 337                 }
 338                 status = fdt_getprop(blob, off, "status", NULL);
 339                 if (status && strcmp(status, "okay") == 0) {
 340                         debug("%s is enabled\n", can_ifs[i]);
 341                         return 1;
 342                 }
 343         }
 344         debug("can driver is disabled\n");
 345         return 0;
 346 }
 347
 348 static inline void karo_fdt_set_lcd_pins(void *blob, const char *name)
 349 {
 350         int off = fdt_path_offset(blob, name);
 351         u32 ph;
 352         const struct fdt_property *pc;
 353         int len;
 354
 355         if (off < 0)
 356                 return;
 357
 358         ph = fdt_create_phandle(blob, off);
 359         if (!ph)
 360                 return;
 361
 362         off = fdt_path_offset(blob, "display");
 363         if (off < 0)
 364                 return;
 365
 366         pc = fdt_get_property(blob, off, "pinctrl-0", &len);
 367         if (!pc || len < sizeof(ph))
 368                 return;
 369
 370         memcpy((void *)pc->data, &ph, sizeof(ph));
 371         fdt_setprop_cell(blob, off, "pinctrl-0", ph);
 372 }
 373
 374 void karo_fdt_fixup_flexcan(void *blob, int xcvr_present)
 375 {
 376         int ret;
 377         const char *xcvr_status = "disabled";
 378         const char *otg_mode = getenv("otg_mode");
 379
 380         if (xcvr_present) {
 381                 if (karo_fdt_flexcan_enabled(blob)) {
 382                         if (!is_lvds()) {
 383                                 debug("Changing LCD to use 23bits only\n");
 384                                 karo_fdt_set_lcd_pins(blob, "lcdif_23bit_pins_a");
 385                                 xcvr_status = NULL;
 386                         }
 387                 } else if (!is_lvds()) {
 388                         debug("Changing LCD to use 24bits\n");
 389                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 390                 }
 391         } else {
 392                 int off = fdt_path_offset(blob, "can0");
 393
 394                 if (off >= 0)
 395                         fdt_delprop(blob, off, "xceiver-supply");
 396                 off = fdt_path_offset(blob, "can1");
 397                 if (off >= 0)
 398                         fdt_delprop(blob, off, "xceiver-supply");
 399                 if (!is_lvds())
 400                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 401         }
 402
 403         if (otg_mode && strcasecmp(otg_mode, "host") == 0)
 404                 karo_fdt_enable_node(blob, "can1", 0);
 405
 406         if (xcvr_status) {
 407                 debug("Disabling CAN XCVR\n");
 408                 ret = fdt_find_and_setprop(blob, "reg_can_xcvr", "status",
 409                                         xcvr_status, strlen(xcvr_status) + 1, 1);
 410                 if (ret)
 411                         printf("Failed to disable CAN transceiver switch: %s\n",
 412                                 fdt_strerror(ret));
 413         }
 414 }
 415
 416 void karo_fdt_del_prop(void *blob, const char *compat, phys_addr_t offs,
 417                         const char *prop)
 418 {
 419         int ret;
 420         int offset;
 421         const uint32_t *phandle;
 422         uint32_t ph = 0;
 423
 424         offset = fdt_node_offset_by_compat_reg(blob, compat, offs);
 425         if (offset <= 0)
 426                 return;
 427
 428         phandle = fdt_getprop(blob, offset, prop, NULL);
 429         if (phandle) {
 430                 ph = fdt32_to_cpu(*phandle);
 431         }
 432
 433         debug("Removing property '%s' from node %s@%08lx\n", prop, compat, offs);
 434         ret = fdt_delprop(blob, offset, prop);
 435         if (ret == 0)
 436                 karo_set_fdtsize(blob);
 437
 438         if (!ph)
 439                 return;
 440
 441         offset = fdt_node_offset_by_phandle(blob, ph);
 442         if (offset <= 0)
 443                 return;
 444
 445         debug("Removing node @ %08x\n", offset);
 446         fdt_del_node(blob, offset);
 447         karo_set_fdtsize(blob);
 448 }
 449
 450 static int fdt_init_fb_mode(const void *blob, int off, struct fb_videomode *fb_mode)
 451 {
 452         const uint32_t *prop;
 453
 454         memset(fb_mode, 0, sizeof(*fb_mode));
 455
 456         prop = fdt_getprop(blob, off, "clock-frequency", NULL);
 457         if (prop)
 458                 fb_mode->pixclock = KHZ2PICOS(fdt32_to_cpu(*prop) / 1000);
 459
 460         prop = fdt_getprop(blob, off, "hactive", NULL);
 461         if (prop)
 462                 fb_mode->xres = fdt32_to_cpu(*prop);
 463
 464         prop = fdt_getprop(blob, off, "vactive", NULL);
 465         if (prop)
 466                 fb_mode->yres = fdt32_to_cpu(*prop);
 467
 468         prop = fdt_getprop(blob, off, "hback-porch", NULL);
 469         if (prop)
 470                 fb_mode->left_margin = fdt32_to_cpu(*prop);
 471
 472         prop = fdt_getprop(blob, off, "hsync-len", NULL);
 473         if (prop)
 474                 fb_mode->hsync_len = fdt32_to_cpu(*prop);
 475
 476         prop = fdt_getprop(blob, off, "hfront-porch", NULL);
 477         if (prop)
 478                 fb_mode->right_margin = fdt32_to_cpu(*prop);
 479
 480         prop = fdt_getprop(blob, off, "vback-porch", NULL);
 481         if (prop)
 482                 fb_mode->upper_margin = fdt32_to_cpu(*prop);
 483
 484         prop = fdt_getprop(blob, off, "vsync-len", NULL);
 485         if (prop)
 486                 fb_mode->vsync_len = fdt32_to_cpu(*prop);
 487
 488         prop = fdt_getprop(blob, off, "vfront-porch", NULL);
 489         if (prop)
 490                 fb_mode->lower_margin = fdt32_to_cpu(*prop);
 491
 492         prop = fdt_getprop(blob, off, "hsync-active", NULL);
 493         if (prop)
 494                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 495
 496         prop = fdt_getprop(blob, off, "vsync-active", NULL);
 497         if (prop)
 498                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 499
 500         prop = fdt_getprop(blob, off, "de-active", NULL);
 501         if (prop)
 502                 fb_mode->sync |= *prop ? 0 : FB_SYNC_OE_LOW_ACT;
 503
 504         prop = fdt_getprop(blob, off, "pixelclk-active", NULL);
 505         if (prop)
 506                 fb_mode->sync |= *prop ? 0 : FB_SYNC_CLK_LAT_FALL;
 507
 508         return 0;
 509 }
 510
 511 static int fdt_update_native_fb_mode(void *blob, int off)
 512 {
 513         int ret;
 514         uint32_t ph;
 515
 516         ret = fdt_increase_size(blob, 64);
 517         if (ret) {
 518                 printf("Warning: Failed to increase FDT size: %s\n",
 519                         fdt_strerror(ret));
 520         }
 521         debug("Creating phandle at offset %d\n", off);
 522         ph = fdt_create_phandle(blob, off);
 523         if (!ph) {
 524                 printf("Failed to create phandle for video timing\n");
 525                 return -ENOMEM;
 526         }
 527
 528         debug("phandle of %s @ %06x=%04x\n", fdt_get_name(blob, off, NULL),
 529                 off, ph);
 530         off = fdt_parent_offset(blob, off);
 531         if (off < 0)
 532                 return off;
 533         debug("parent offset=%06x\n", off);
 534         ret = fdt_setprop_cell(blob, off, "native-mode", ph);
 535         if (ret)
 536                 printf("Failed to set property 'native-mode': %s\n",
 537                         fdt_strerror(ret));
 538         karo_set_fdtsize(blob);
 539         return ret;
 540 }
 541
 542 static int karo_fdt_find_video_timings(void *blob)
 543 {
 544         int off = fdt_path_offset(blob, "display");
 545         const char *subnode = "display-timings";
 546
 547         if (off < 0) {
 548                 debug("Could not find node 'display' in FDT: %s\n",
 549                         fdt_strerror(off));
 550                 return off;
 551         }
 552
 553         off = fdt_subnode_offset(blob, off, subnode);
 554         if (off < 0) {
 555                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 556                         fdt_strerror(off));
 557         }
 558         return off;
 559 }
 560
 561 int karo_fdt_get_fb_mode(void *blob, const char *name, struct fb_videomode *fb_mode)
 562 {
 563         int off = karo_fdt_find_video_timings(blob);
 564
 565         if (off < 0)
 566                 return off;
 567         while (off > 0) {
 568                 const char *n, *endp;
 569                 int len, d = 1;
 570
 571                 off = fdt_next_node(blob, off, &d);
 572                 if (off < 0)
 573                         return off;
 574                 if (d < 1)
 575                         return -EINVAL;
 576                 if (d > 2) {
 577                         debug("Skipping node @ %04x %s depth %d\n", off,
 578                                 fdt_get_name(blob, off, NULL), d);
 579                         continue;
 580                 }
 581
 582                 n = fdt_getprop(blob, off, "panel-name", &len);
 583                 if (!n) {
 584                         n = fdt_get_name(blob, off, NULL);
 585                         if (strcasecmp(n, name) == 0) {
 586                                 break;
 587                         }
 588                 } else {
 589                         int found = 0;
 590
 591                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 592                                 debug("Checking panel-name '%s'\n", n);
 593                                 if (strcasecmp(n, name) == 0) {
 594                                         debug("Using node %s @ %04x\n",
 595                                                 fdt_get_name(blob, off, NULL), off);
 596                                         found = 1;
 597                                         break;
 598                                 }
 599                         }
 600                         if (found)
 601                                 break;
 602                 }
 603         }
 604         if (off > 0) {
 605                 return fdt_init_fb_mode(blob, off, fb_mode);
 606         }
 607         return -EINVAL;
 608 }
 609
 610 #define SET_FB_PROP(n, v) ({                                            \
 611         int ret;                                                        \
 612         ret = fdt_setprop_u32(blob, off, n, v);                         \
 613         if (ret) {                                                      \
 614                 printf("Failed to set property %s: %s\n", name,         \
 615                         fdt_strerror(ret));                             \
 616         }                                                               \
 617         ret;                                                            \
 618 })
 619
 620
 621 int karo_fdt_create_fb_mode(void *blob, const char *name,
 622                         struct fb_videomode *fb_mode)
 623 {
 624         int off = fdt_path_offset(blob, "display");
 625         int ret;
 626         const char *subnode = "display-timings";
 627
 628         if (off < 0) {
 629                 printf("'display' node not found in FDT\n");
 630                 return off;
 631         }
 632
 633         ret = fdt_increase_size(blob, 512);
 634         if (ret) {
 635                 printf("Failed to increase FDT size: %s\n", fdt_strerror(ret));
 636                 return ret;
 637         }
 638
 639         ret = fdt_subnode_offset(blob, off, subnode);
 640         if (ret < 0) {
 641                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 642                         fdt_strerror(ret));
 643                 ret = fdt_add_subnode(blob, off, subnode);
 644                 if (ret < 0) {
 645                         printf("Failed to add %s subnode: %s\n", subnode,
 646                                 fdt_strerror(ret));
 647                         return ret;
 648                 }
 649         }
 650
 651         ret = fdt_add_subnode(blob, ret, name);
 652         if (ret < 0) {
 653                 printf("Failed to add %s subnode: %s\n", name,
 654                         fdt_strerror(ret));
 655                 return ret;
 656         }
 657         off = ret;
 658
 659         ret = SET_FB_PROP("clock-frequency",
 660                         PICOS2KHZ(fb_mode->pixclock) * 1000);
 661         if (ret)
 662                 goto out;
 663         ret = SET_FB_PROP("hactive", fb_mode->xres);
 664         if (ret)
 665                 goto out;
 666         ret = SET_FB_PROP("vactive", fb_mode->yres);
 667         if (ret)
 668                 goto out;
 669         ret = SET_FB_PROP("hback-porch", fb_mode->left_margin);
 670         if (ret)
 671                 goto out;
 672         ret = SET_FB_PROP("hsync-len", fb_mode->hsync_len);
 673         if (ret)
 674                 goto out;
 675         ret = SET_FB_PROP("hfront-porch", fb_mode->right_margin);
 676         if (ret)
 677                 goto out;
 678         ret = SET_FB_PROP("vback-porch", fb_mode->upper_margin);
 679         if (ret)
 680                 goto out;
 681         ret = SET_FB_PROP("vsync-len", fb_mode->vsync_len);
 682         if (ret)
 683                 goto out;
 684         ret = SET_FB_PROP("vfront-porch", fb_mode->lower_margin);
 685         if (ret)
 686                 goto out;
 687         ret = SET_FB_PROP("hsync-active",
 688                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 689         if (ret)
 690                 goto out;
 691         ret = SET_FB_PROP("vsync-active",
 692                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 693         if (ret)
 694                 goto out;
 695         ret = SET_FB_PROP("de-active",
 696                         !(fb_mode->sync & FB_SYNC_OE_LOW_ACT));
 697         if (ret)
 698                 goto out;
 699         ret = SET_FB_PROP("pixelclk-active",
 700                         !(fb_mode->sync & FB_SYNC_CLK_LAT_FALL));
 701 out:
 702         karo_set_fdtsize(blob);
 703         return ret;
 704 }
 705
 706 int karo_fdt_update_fb_mode(void *blob, const char *name)
 707 {
 708         int off = fdt_path_offset(blob, "display");
 709         const char *subnode = "display-timings";
 710
 711         if (off < 0)
 712                 return off;
 713
 714         if (name == NULL) {
 715                 int ret;
 716
 717                 debug("Disabling node '%s' at %03x\n",
 718                         fdt_get_name(blob, off, NULL), off);
 719                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 720                 return ret;
 721         }
 722
 723         off = fdt_subnode_offset(blob, off, subnode);
 724         if (off < 0) {
 725                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 726                         fdt_strerror(off));
 727                 return off;
 728         }
 729         while (off > 0) {
 730                 const char *n, *endp;
 731                 int len, d = 1;
 732
 733                 off = fdt_next_node(blob, off, &d);
 734                 if (off < 0)
 735                         return off;
 736                 if (d < 1)
 737                         return -EINVAL;
 738                 if (d > 2) {
 739                         debug("Skipping node @ %04x %s depth %d\n", off,
 740                                 fdt_get_name(blob, off, NULL), d);
 741                         continue;
 742                 }
 743
 744                 n = fdt_getprop(blob, off, "panel-name", &len);
 745                 if (!n) {
 746                         n = fdt_get_name(blob, off, NULL);
 747                         if (strcasecmp(n, name) == 0) {
 748                                 break;
 749                         }
 750                 } else {
 751                         int found = 0;
 752
 753                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 754                                 debug("Checking panel-name '%s'\n", n);
 755                                 if (strcasecmp(n, name) == 0) {
 756                                         debug("Using node %s @ %04x\n",
 757                                                 fdt_get_name(blob, off, NULL), off);
 758                                         found = 1;
 759                                         break;
 760                                 }
 761                         }
 762                         if (found)
 763                                 break;
 764                 }
 765         }
 766         if (off > 0)
 767                 return fdt_update_native_fb_mode(blob, off);
 768         return off;
 769 }
 770
 771 #ifdef CONFIG_SYS_LVDS_IF
 772 int karo_fdt_get_lcd_bus_width(const void *blob, int default_width)
 773 {
 774         int off = fdt_path_offset(blob, "display");
 775
 776         if (off >= 0) {
 777                 const uint32_t *prop;
 778
 779                 prop = fdt_getprop(blob, off, "fsl,data-width", NULL);
 780                 if (prop)
 781                         return fdt32_to_cpu(*prop);
 782         }
 783         return default_width;
 784 }
 785
 786 int karo_fdt_get_lvds_mapping(const void *blob, int default_mapping)
 787 {
 788         int off = fdt_path_offset(blob, "display");
 789
 790         if (off >= 0) {
 791                 const char *prop;
 792
 793                 prop = fdt_getprop(blob, off, "fsl,data-mapping", NULL);
 794                 if (prop)
 795                         return strcmp(prop, "jeida") == 0;
 796         }
 797         return default_mapping;
 798 }
 799
 800 u8 karo_fdt_get_lvds_channels(const void *blob)
 801 {
 802         static const char *lvds_chans[] = {
 803                 "lvds0",
 804                 "lvds1",
 805         };
 806         u8 lvds_chan_mask = 0;
 807         int i;
 808
 809         for (i = 0; i < ARRAY_SIZE(lvds_chans); i++) {
 810                 const char *status;
 811                 int off = fdt_path_offset(blob, lvds_chans[i]);
 812
 813                 if (off < 0)
 814                         continue;
 815
 816                 status = fdt_getprop(blob, off, "status", NULL);
 817                 if (status && strcmp(status, "okay") == 0) {
 818                         debug("%s is enabled\n", lvds_chans[i]);
 819                         lvds_chan_mask |= 1 << i;
 820                 }
 821         }
 822         return lvds_chan_mask;
 823 }
 824 #endif
 825
 826 int karo_fdt_get_backlight_polarity(const void *blob)
 827 {
 828 #ifdef CONFIG_SYS_LVDS_IF
 829         const char *backlight_node = "/backlight0";
 830 #else
 831         const char *backlight_node = "/backlight";
 832 #endif
 833         int off = fdt_path_offset(blob, "backlight"); /* first try alias */
 834         const struct fdt_property *prop;
 835         int len;
 836
 837         if (off < 0) {
 838                 /*
 839                  * if no 'backlight' alias exists try finding '/backlight0'
 840                  * or '/backlight' depending on LVDS or not
 841                  */
 842                 off = fdt_path_offset(blob, backlight_node);
 843                 if (off < 0) {
 844                         printf("%s node not found in DT\n", backlight_node);
 845                         return off;
 846                 }
 847         }
 848
 849         prop = fdt_get_property(blob, off, "pwms", &len);
 850         if (!prop)
 851                 printf("'pwms' property not found\n");
 852         else
 853                 debug("'pwms' property has len %d\n", len);
 854
 855         len /= sizeof(u32);
 856         if (prop && len > 3) {
 857                 const u32 *data = (const u32 *)prop->data;
 858                 return fdt32_to_cpu(data[3]) == 0;
 859         }
 860         return 0;
 861 }