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