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