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 = 1;
 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 && (strcmp(otg_mode, "device") == 0 ||
 244                                 strcmp(otg_mode, "gadget") == 0)) {
 245                 debug("Setting dr_mode to 'peripheral'\n");
 246                 ret = fdt_setprop_string(blob, off, "dr_mode", "peripheral");
 247         } else if (otg_mode && strcmp(otg_mode, "host") == 0) {
 248                 debug("Setting dr_mode to 'host'\n");
 249                 ret = fdt_setprop_string(blob, off, "dr_mode", "host");
 250                 disable_phy_pins = 0;
 251         } else if (otg_mode && strcmp(otg_mode, "otg") == 0) {
 252                 debug("Setting dr_mode to 'host'\n");
 253                 ret = fdt_setprop_string(blob, off, "dr_mode", "otg");
 254                 disable_phy_pins = 0;
 255         } else {
 256                 if (otg_mode && strcmp(otg_mode, "none") != 0)
 257                         printf("Invalid 'otg_mode' setting '%s'; disabling usbotg port\n",
 258                                 otg_mode);
 259                 disable_otg = 1;
 260                 ret = 0;
 261         }
 262
 263         if ((!disable_phy_pins && !disable_otg) || ret)
 264                 goto out;
 265
 266         ret = karo_fdt_disable_node_phandle(blob, node, phy_supply);
 267         if (ret)
 268                 goto out;
 269
 270         if (disable_otg) {
 271                 debug("Disabling usbphy\n");
 272                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 273                 if (ret)
 274                         goto out;
 275
 276                 ret = karo_fdt_disable_node_phandle(blob, node, phy);
 277         } else if (disable_phy_pins) {
 278                 debug("Removing 'vbus-supply' from usbotg node\n");
 279                 fdt_delprop(blob, off, phy_supply);
 280         }
 281
 282 out:
 283         if (ret)
 284                 printf("Failed to update usbotg: %s\n", fdt_strerror(ret));
 285         else
 286                 debug("node '%s' updated\n", node);
 287         karo_set_fdtsize(blob);
 288 }
 289
 290 static inline int karo_fdt_flexcan_enabled(void *blob)
 291 {
 292         static const char *can_ifs[] = {
 293                 "can0",
 294                 "can1",
 295         };
 296         size_t i;
 297
 298         for (i = 0; i < ARRAY_SIZE(can_ifs); i++) {
 299                 const char *status;
 300                 int off = fdt_path_offset(blob, can_ifs[i]);
 301
 302                 if (off < 0) {
 303                         debug("node '%s' not found\n", can_ifs[i]);
 304                         continue;
 305                 }
 306                 status = fdt_getprop(blob, off, "status", NULL);
 307                 if (status && strcmp(status, "okay") == 0) {
 308                         debug("%s is enabled\n", can_ifs[i]);
 309                         return 1;
 310                 }
 311         }
 312         debug("can driver is disabled\n");
 313         return 0;
 314 }
 315
 316 static inline void karo_fdt_set_lcd_pins(void *blob, const char *name)
 317 {
 318         int off = fdt_path_offset(blob, name);
 319         u32 ph;
 320         const struct fdt_property *pc;
 321         int len;
 322
 323         if (off < 0)
 324                 return;
 325
 326         ph = fdt_create_phandle(blob, off);
 327         if (!ph)
 328                 return;
 329
 330         off = fdt_path_offset(blob, "display");
 331         if (off < 0)
 332                 return;
 333
 334         pc = fdt_get_property(blob, off, "pinctrl-0", &len);
 335         if (!pc || len < sizeof(ph))
 336                 return;
 337
 338         memcpy((void *)pc->data, &ph, sizeof(ph));
 339         fdt_setprop_cell(blob, off, "pinctrl-0", ph);
 340 }
 341
 342 void karo_fdt_fixup_flexcan(void *blob, int xcvr_present)
 343 {
 344         int ret;
 345         const char *xcvr_status = "disabled";
 346         const char *otg_mode = getenv("otg_mode");
 347
 348         if (xcvr_present) {
 349                 if (karo_fdt_flexcan_enabled(blob)) {
 350                         if (!is_lvds()) {
 351                                 debug("Changing LCD to use 23bits only\n");
 352                                 karo_fdt_set_lcd_pins(blob, "lcdif_23bit_pins_a");
 353                                 xcvr_status = NULL;
 354                         }
 355                 } else if (!is_lvds()) {
 356                         debug("Changing LCD to use 24bits\n");
 357                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 358                 }
 359         } else {
 360                 int off = fdt_path_offset(blob, "can0");
 361
 362                 if (off >= 0)
 363                         fdt_delprop(blob, off, "xceiver-supply");
 364                 off = fdt_path_offset(blob, "can1");
 365                 if (off >= 0)
 366                         fdt_delprop(blob, off, "xceiver-supply");
 367                 if (!is_lvds())
 368                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 369         }
 370
 371         if (otg_mode && strcmp(otg_mode, "host") == 0)
 372                 karo_fdt_enable_node(blob, "can1", 0);
 373
 374         if (xcvr_status) {
 375                 debug("Disabling CAN XCVR\n");
 376                 ret = fdt_find_and_setprop(blob, "reg_can_xcvr", "status",
 377                                         xcvr_status, strlen(xcvr_status) + 1, 1);
 378                 if (ret)
 379                         printf("Failed to disable CAN transceiver switch: %s\n",
 380                                 fdt_strerror(ret));
 381         }
 382 }
 383
 384 void karo_fdt_del_prop(void *blob, const char *compat, phys_addr_t offs,
 385                         const char *prop)
 386 {
 387         int ret;
 388         int offset;
 389         const uint32_t *phandle;
 390         uint32_t ph = 0;
 391
 392         offset = fdt_node_offset_by_compat_reg(blob, compat, offs);
 393         if (offset <= 0)
 394                 return;
 395
 396         phandle = fdt_getprop(blob, offset, prop, NULL);
 397         if (phandle) {
 398                 ph = fdt32_to_cpu(*phandle);
 399         }
 400
 401         debug("Removing property '%s' from node %s@%08lx\n", prop, compat, offs);
 402         ret = fdt_delprop(blob, offset, prop);
 403         if (ret == 0)
 404                 karo_set_fdtsize(blob);
 405
 406         if (!ph)
 407                 return;
 408
 409         offset = fdt_node_offset_by_phandle(blob, ph);
 410         if (offset <= 0)
 411                 return;
 412
 413         debug("Removing node @ %08x\n", offset);
 414         fdt_del_node(blob, offset);
 415         karo_set_fdtsize(blob);
 416 }
 417
 418 static int fdt_init_fb_mode(const void *blob, int off, struct fb_videomode *fb_mode)
 419 {
 420         const uint32_t *prop;
 421
 422         memset(fb_mode, 0, sizeof(*fb_mode));
 423
 424         prop = fdt_getprop(blob, off, "clock-frequency", NULL);
 425         if (prop)
 426                 fb_mode->pixclock = KHZ2PICOS(fdt32_to_cpu(*prop) / 1000);
 427
 428         prop = fdt_getprop(blob, off, "hactive", NULL);
 429         if (prop)
 430                 fb_mode->xres = fdt32_to_cpu(*prop);
 431
 432         prop = fdt_getprop(blob, off, "vactive", NULL);
 433         if (prop)
 434                 fb_mode->yres = fdt32_to_cpu(*prop);
 435
 436         prop = fdt_getprop(blob, off, "hback-porch", NULL);
 437         if (prop)
 438                 fb_mode->left_margin = fdt32_to_cpu(*prop);
 439
 440         prop = fdt_getprop(blob, off, "hsync-len", NULL);
 441         if (prop)
 442                 fb_mode->hsync_len = fdt32_to_cpu(*prop);
 443
 444         prop = fdt_getprop(blob, off, "hfront-porch", NULL);
 445         if (prop)
 446                 fb_mode->right_margin = fdt32_to_cpu(*prop);
 447
 448         prop = fdt_getprop(blob, off, "vback-porch", NULL);
 449         if (prop)
 450                 fb_mode->upper_margin = fdt32_to_cpu(*prop);
 451
 452         prop = fdt_getprop(blob, off, "vsync-len", NULL);
 453         if (prop)
 454                 fb_mode->vsync_len = fdt32_to_cpu(*prop);
 455
 456         prop = fdt_getprop(blob, off, "vfront-porch", NULL);
 457         if (prop)
 458                 fb_mode->lower_margin = fdt32_to_cpu(*prop);
 459
 460         prop = fdt_getprop(blob, off, "hsync-active", NULL);
 461         if (prop)
 462                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 463
 464         prop = fdt_getprop(blob, off, "vsync-active", NULL);
 465         if (prop)
 466                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 467
 468         prop = fdt_getprop(blob, off, "de-active", NULL);
 469         if (prop)
 470                 fb_mode->sync |= *prop ? 0 : FB_SYNC_OE_LOW_ACT;
 471
 472         prop = fdt_getprop(blob, off, "pixelclk-active", NULL);
 473         if (prop)
 474                 fb_mode->sync |= *prop ? 0 : FB_SYNC_CLK_LAT_FALL;
 475
 476         return 0;
 477 }
 478
 479 static int fdt_update_native_fb_mode(void *blob, int off)
 480 {
 481         int ret;
 482         uint32_t ph;
 483
 484         ret = fdt_increase_size(blob, 64);
 485         if (ret) {
 486                 printf("Warning: Failed to increase FDT size: %s\n",
 487                         fdt_strerror(ret));
 488         }
 489         debug("Creating phandle at offset %d\n", off);
 490         ph = fdt_create_phandle(blob, off);
 491         if (!ph) {
 492                 printf("Failed to create phandle for video timing\n");
 493                 return -ENOMEM;
 494         }
 495
 496         debug("phandle of %s @ %06x=%04x\n", fdt_get_name(blob, off, NULL),
 497                 off, ph);
 498         off = fdt_parent_offset(blob, off);
 499         if (off < 0)
 500                 return off;
 501         debug("parent offset=%06x\n", off);
 502         ret = fdt_setprop_cell(blob, off, "native-mode", ph);
 503         if (ret)
 504                 printf("Failed to set property 'native-mode': %s\n",
 505                         fdt_strerror(ret));
 506         karo_set_fdtsize(blob);
 507         return ret;
 508 }
 509
 510 static int karo_fdt_find_video_timings(void *blob)
 511 {
 512         int off = fdt_path_offset(blob, "display");
 513         const char *subnode = "display-timings";
 514
 515         if (off < 0) {
 516                 debug("Could not find node 'display' in FDT: %s\n",
 517                         fdt_strerror(off));
 518                 return off;
 519         }
 520
 521         off = fdt_subnode_offset(blob, off, subnode);
 522         if (off < 0) {
 523                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 524                         fdt_strerror(off));
 525         }
 526         return off;
 527 }
 528
 529 int karo_fdt_get_fb_mode(void *blob, const char *name, struct fb_videomode *fb_mode)
 530 {
 531         int off = karo_fdt_find_video_timings(blob);
 532
 533         if (off < 0)
 534                 return off;
 535         while (off > 0) {
 536                 const char *n, *endp;
 537                 int len, d = 1;
 538
 539                 off = fdt_next_node(blob, off, &d);
 540                 if (off < 0)
 541                         return off;
 542                 if (d < 1)
 543                         return -EINVAL;
 544                 if (d > 2) {
 545                         debug("Skipping node @ %04x %s depth %d\n", off,
 546                                 fdt_get_name(blob, off, NULL), d);
 547                         continue;
 548                 }
 549                 debug("parsing subnode @ %04x %s depth %d\n", off,
 550                         fdt_get_name(blob, off, NULL), d);
 551
 552                 n = fdt_getprop(blob, off, "panel-name", &len);
 553                 if (!n) {
 554                         n = fdt_get_name(blob, off, NULL);
 555                         if (strcasecmp(n, name) == 0) {
 556                                 break;
 557                         }
 558                 } else {
 559                         int found = 0;
 560
 561                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 562                                 debug("Checking panel-name '%s'\n", n);
 563                                 if (strcasecmp(n, name) == 0) {
 564                                         debug("Using node %s @ %04x\n",
 565                                                 fdt_get_name(blob, off, NULL), off);
 566                                         found = 1;
 567                                         break;
 568                                 }
 569                         }
 570                         if (found)
 571                                 break;
 572                 }
 573         }
 574         if (off > 0) {
 575                 return fdt_init_fb_mode(blob, off, fb_mode);
 576         }
 577         return -EINVAL;
 578 }
 579
 580 #define SET_FB_PROP(n, v) ({                                            \
 581         int ret;                                                        \
 582         ret = fdt_setprop_u32(blob, off, n, v);                         \
 583         if (ret) {                                                      \
 584                 printf("Failed to set property %s: %s\n", name,         \
 585                         fdt_strerror(ret));                             \
 586         }                                                               \
 587         ret;                                                            \
 588 })
 589
 590
 591 int karo_fdt_create_fb_mode(void *blob, const char *name,
 592                         struct fb_videomode *fb_mode)
 593 {
 594         int off = fdt_path_offset(blob, "display");
 595         int ret;
 596         const char *subnode = "display-timings";
 597
 598         if (off < 0) {
 599                 printf("'display' node not found in FDT\n");
 600                 return off;
 601         }
 602
 603         ret = fdt_increase_size(blob, 512);
 604         if (ret) {
 605                 printf("Failed to increase FDT size: %s\n", fdt_strerror(ret));
 606                 return ret;
 607         }
 608
 609         ret = fdt_subnode_offset(blob, off, subnode);
 610         if (ret < 0) {
 611                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 612                         fdt_strerror(ret));
 613                 ret = fdt_add_subnode(blob, off, subnode);
 614                 if (ret < 0) {
 615                         printf("Failed to add %s subnode: %s\n", subnode,
 616                                 fdt_strerror(ret));
 617                         return ret;
 618                 }
 619         }
 620
 621         ret = fdt_add_subnode(blob, ret, name);
 622         if (ret < 0) {
 623                 printf("Failed to add %s subnode: %s\n", name,
 624                         fdt_strerror(ret));
 625                 return ret;
 626         }
 627         off = ret;
 628
 629         ret = SET_FB_PROP("clock-frequency",
 630                         PICOS2KHZ(fb_mode->pixclock) * 1000);
 631         if (ret)
 632                 goto out;
 633         ret = SET_FB_PROP("hactive", fb_mode->xres);
 634         if (ret)
 635                 goto out;
 636         ret = SET_FB_PROP("vactive", fb_mode->yres);
 637         if (ret)
 638                 goto out;
 639         ret = SET_FB_PROP("hback-porch", fb_mode->left_margin);
 640         if (ret)
 641                 goto out;
 642         ret = SET_FB_PROP("hsync-len", fb_mode->hsync_len);
 643         if (ret)
 644                 goto out;
 645         ret = SET_FB_PROP("hfront-porch", fb_mode->right_margin);
 646         if (ret)
 647                 goto out;
 648         ret = SET_FB_PROP("vback-porch", fb_mode->upper_margin);
 649         if (ret)
 650                 goto out;
 651         ret = SET_FB_PROP("vsync-len", fb_mode->vsync_len);
 652         if (ret)
 653                 goto out;
 654         ret = SET_FB_PROP("vfront-porch", fb_mode->lower_margin);
 655         if (ret)
 656                 goto out;
 657         ret = SET_FB_PROP("hsync-active",
 658                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 659         if (ret)
 660                 goto out;
 661         ret = SET_FB_PROP("vsync-active",
 662                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 663         if (ret)
 664                 goto out;
 665         ret = SET_FB_PROP("de-active",
 666                         !(fb_mode->sync & FB_SYNC_OE_LOW_ACT));
 667         if (ret)
 668                 goto out;
 669         ret = SET_FB_PROP("pixelclk-active",
 670                         !(fb_mode->sync & FB_SYNC_CLK_LAT_FALL));
 671 out:
 672         karo_set_fdtsize(blob);
 673         return ret;
 674 }
 675
 676 int karo_fdt_update_fb_mode(void *blob, const char *name)
 677 {
 678         int off = fdt_path_offset(blob, "display");
 679         const char *subnode = "display-timings";
 680
 681         if (off < 0)
 682                 return off;
 683
 684         if (name == NULL) {
 685                 int ret;
 686
 687                 debug("Disabling node '%s' at %03x\n",
 688                         fdt_get_name(blob, off, NULL), off);
 689                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 690                 return ret;
 691         }
 692
 693         off = fdt_subnode_offset(blob, off, subnode);
 694         if (off < 0) {
 695                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 696                         fdt_strerror(off));
 697                 return off;
 698         }
 699         while (off > 0) {
 700                 const char *n, *endp;
 701                 int len, d = 1;
 702
 703                 off = fdt_next_node(blob, off, &d);
 704                 if (off < 0)
 705                         return off;
 706                 if (d < 1)
 707                         return -EINVAL;
 708                 if (d > 2) {
 709                         debug("Skipping node @ %04x %s depth %d\n", off,
 710                                 fdt_get_name(blob, off, NULL), d);
 711                         continue;
 712                 }
 713                 debug("parsing subnode @ %04x %s depth %d\n", off,
 714                         fdt_get_name(blob, off, NULL), d);
 715
 716                 n = fdt_getprop(blob, off, "panel-name", &len);
 717                 if (!n) {
 718                         n = fdt_get_name(blob, off, NULL);
 719                         if (strcasecmp(n, name) == 0) {
 720                                 break;
 721                         }
 722                 } else {
 723                         int found = 0;
 724
 725                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 726                                 debug("Checking panel-name '%s'\n", n);
 727                                 if (strcasecmp(n, name) == 0) {
 728                                         debug("Using node %s @ %04x\n",
 729                                                 fdt_get_name(blob, off, NULL), off);
 730                                         found = 1;
 731                                         break;
 732                                 }
 733                         }
 734                         if (found)
 735                                 break;
 736                 }
 737         }
 738         if (off > 0)
 739                 return fdt_update_native_fb_mode(blob, off);
 740         return off;
 741 }
 742
 743 #ifdef CONFIG_SYS_LVDS_IF
 744 int karo_fdt_get_lcd_bus_width(const void *blob, int default_width)
 745 {
 746         int off = fdt_path_offset(blob, "display");
 747
 748         if (off >= 0) {
 749                 const uint32_t *prop;
 750
 751                 prop = fdt_getprop(blob, off, "fsl,data-width", NULL);
 752                 if (prop)
 753                         return fdt32_to_cpu(*prop);
 754         }
 755         return default_width;
 756 }
 757
 758 int karo_fdt_get_lvds_mapping(const void *blob, int default_mapping)
 759 {
 760         int off = fdt_path_offset(blob, "display");
 761
 762         if (off >= 0) {
 763                 const char *prop;
 764
 765                 prop = fdt_getprop(blob, off, "fsl,data-mapping", NULL);
 766                 if (prop)
 767                         return strcmp(prop, "jeida") == 0;
 768         }
 769         return default_mapping;
 770 }
 771
 772 u8 karo_fdt_get_lvds_channels(const void *blob)
 773 {
 774         static const char *lvds_chans[] = {
 775                 "lvds0",
 776                 "lvds1",
 777         };
 778         u8 lvds_chan_mask = 0;
 779         int i;
 780
 781         for (i = 0; i < ARRAY_SIZE(lvds_chans); i++) {
 782                 const char *status;
 783                 int off = fdt_path_offset(blob, lvds_chans[i]);
 784
 785                 if (off < 0)
 786                         continue;
 787
 788                 status = fdt_getprop(blob, off, "status", NULL);
 789                 if (status && strcmp(status, "okay") == 0) {
 790                         debug("%s is enabled\n", lvds_chans[i]);
 791                         lvds_chan_mask |= 1 << i;
 792                 }
 793         }
 794         return lvds_chan_mask;
 795 }
 796 #endif
 797
 798 int karo_fdt_get_backlight_polarity(const void *blob)
 799 {
 800 #ifdef CONFIG_SYS_LVDS_IF
 801         const char *backlight_node = "/backlight0";
 802 #else
 803         const char *backlight_node = "/backlight";
 804 #endif
 805         int off = fdt_path_offset(blob, "backlight"); /* first try alias */
 806         const struct fdt_property *prop;
 807         int len;
 808
 809         if (off < 0) {
 810                 /*
 811                  * if no 'backlight' alias exists try finding '/backlight0'
 812                  * or '/backlight' depending on LVDS or not
 813                  */
 814                 off = fdt_path_offset(blob, backlight_node);
 815                 if (off < 0) {
 816                         printf("%s node not found in DT\n", backlight_node);
 817                         return off;
 818                 }
 819         }
 820
 821         prop = fdt_get_property(blob, off, "pwms", &len);
 822         if (!prop)
 823                 printf("'pwms' property not found\n");
 824         else
 825                 debug("'pwms' property has len %d\n", len);
 826
 827         len /= sizeof(u32);
 828         if (prop && len > 3) {
 829                 const u32 *data = (const u32 *)prop->data;
 830                 return fdt32_to_cpu(data[3]) == 0;
 831         }
 832         return 0;
 833 }