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 (tstc()) {
 101                 debug("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': %d\n", node, off);
 180         } else {
 181                 ret = fdt_del_node(blob, off);
 182                 if (ret)
 183                         printf("Failed to remove node '%s': %d\n",
 184                                 node, ret);
 185         }
 186         karo_set_fdtsize(blob);
 187 }
 188
 189 void karo_fdt_enable_node(void *blob, const char *node, int enable)
 190 {
 191         int off = fdt_path_offset(blob, node);
 192
 193         debug("%sabling node '%s'\n", enable ? "En" : "Dis", node);
 194         if (off < 0) {
 195                 printf("Could not find node '%s': %d\n", node, off);
 196                 return;
 197         }
 198         fdt_set_node_status(blob, off,
 199                         enable ? FDT_STATUS_OKAY : FDT_STATUS_DISABLED, 0);
 200
 201         karo_set_fdtsize(blob);
 202 }
 203
 204 static const char *karo_touchpanels[] = {
 205         "ti,tsc2007",
 206         "edt,edt-ft5x06",
 207 #ifdef CONFIG_MX28
 208         "fsl,imx28-lradc",
 209 #endif
 210 };
 211
 212 static void fdt_disable_tp_node(void *blob, const char *name)
 213 {
 214         int offs = fdt_node_offset_by_compatible(blob, -1, name);
 215
 216         if (offs < 0) {
 217                 debug("node '%s' not found: %d\n", name, offs);
 218                 return;
 219         }
 220
 221         debug("Disabling node '%s'\n", name);
 222         fdt_set_node_status(blob, offs, FDT_STATUS_DISABLED, 0);
 223 }
 224
 225 void karo_fdt_fixup_touchpanel(void *blob)
 226 {
 227         int i;
 228         const char *model = getenv("touchpanel");
 229
 230         for (i = 0; i < ARRAY_SIZE(karo_touchpanels); i++) {
 231                 const char *tp = karo_touchpanels[i];
 232
 233                 if (model != NULL && strcmp(model, tp) == 0)
 234                         continue;
 235
 236                 if (model != NULL) {
 237                         if (strcmp(model, tp) == 0)
 238                                 continue;
 239                         tp = strchr(tp, ',');
 240                         if (tp != NULL && *tp != '\0' && strcmp(model, tp + 1) == 0)
 241                                 continue;
 242                 }
 243                 fdt_disable_tp_node(blob, karo_touchpanels[i]);
 244         }
 245         karo_set_fdtsize(blob);
 246 }
 247
 248 void karo_fdt_fixup_usb_otg(void *blob, const char *node, const char *phy)
 249 {
 250         const char *otg_mode = getenv("otg_mode");
 251         int off;
 252         int ret;
 253         const uint32_t *ph;
 254         int disable_otg = 0;
 255         int disable_phy_pins = 1;
 256
 257         debug("OTG mode is '%s'\n", otg_mode ? otg_mode : "<UNSET>");
 258
 259         off = fdt_path_offset(blob, node);
 260         if (off < 0) {
 261                 debug("Failed to find node %s\n", node);
 262                 return;
 263         }
 264
 265         if (otg_mode && (strcmp(otg_mode, "device") == 0 ||
 266                                 strcmp(otg_mode, "gadget") == 0)) {
 267                 debug("Setting dr_mode to 'peripheral'\n");
 268                 ret = fdt_setprop_string(blob, off, "dr_mode", "peripheral");
 269         } else if (otg_mode && strcmp(otg_mode, "host") == 0) {
 270                 debug("Setting dr_mode to 'host'\n");
 271                 ret = fdt_setprop_string(blob, off, "dr_mode", "host");
 272                 disable_phy_pins = 0;
 273         } else if (otg_mode && strcmp(otg_mode, "otg") == 0) {
 274                 debug("Setting dr_mode to 'host'\n");
 275                 ret = fdt_setprop_string(blob, off, "dr_mode", "otg");
 276         } else {
 277                 if (otg_mode && strcmp(otg_mode, "none") != 0)
 278                         printf("Invalid 'otg_mode' setting '%s'; disabling usbotg port\n",
 279                                 otg_mode);
 280                 disable_otg = 1;
 281                 ret = 0;
 282         }
 283
 284         if ((!disable_phy_pins && !disable_otg) || ret)
 285                 goto out;
 286
 287         if (disable_otg) {
 288                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 289                 if (ret)
 290                         goto out;
 291         }
 292
 293         ph = fdt_getprop(blob, off, phy, NULL);
 294         if (ph == NULL) {
 295                 printf("Failed to find '%s' phandle in node '%s'\n", phy,
 296                         fdt_get_name(blob, off, NULL));
 297                 goto out;
 298         }
 299
 300         off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 301         if (off <= 0) {
 302                 printf("Failed to find '%s' node via phandle %04x\n",
 303                         phy, fdt32_to_cpu(*ph));
 304                 goto out;
 305         }
 306
 307         if (disable_otg) {
 308                 debug("Disabling usbphy\n");
 309                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 310         }
 311 out:
 312         if (ret)
 313                 printf("Failed to update usbotg: %d\n", ret);
 314         else
 315                 debug("node '%s' updated\n", node);
 316         karo_set_fdtsize(blob);
 317 }
 318
 319 static int karo_fdt_flexcan_enabled(void *blob)
 320 {
 321         const char *can_ifs[] = {
 322                 "can0",
 323                 "can1",
 324         };
 325         size_t i;
 326
 327         for (i = 0; i < ARRAY_SIZE(can_ifs); i++) {
 328                 const char *status;
 329                 int off = fdt_path_offset(blob, can_ifs[i]);
 330
 331                 if (off < 0) {
 332                         debug("node '%s' not found\n", can_ifs[i]);
 333                         continue;
 334                 }
 335                 status = fdt_getprop(blob, off, "status", NULL);
 336                 if (status && strcmp(status, "okay") == 0) {
 337                         debug("%s is enabled\n", can_ifs[i]);
 338                         return 1;
 339                 }
 340         }
 341         debug("can driver is disabled\n");
 342         return 0;
 343 }
 344
 345 static void karo_fdt_set_lcd_pins(void *blob, const char *name)
 346 {
 347         int off = fdt_path_offset(blob, name);
 348         u32 ph;
 349         const struct fdt_property *pc;
 350         int len;
 351
 352         if (off < 0)
 353                 return;
 354
 355         ph = fdt_create_phandle(blob, off);
 356         if (!ph)
 357                 return;
 358
 359         off = fdt_path_offset(blob, "display");
 360         if (off < 0)
 361                 return;
 362
 363         pc = fdt_get_property(blob, off, "pinctrl-0", &len);
 364         if (!pc || len < sizeof(ph))
 365                 return;
 366
 367         memcpy((void *)pc->data, &ph, sizeof(ph));
 368         fdt_setprop_cell(blob, off, "pinctrl-0", ph);
 369 }
 370
 371 void karo_fdt_fixup_flexcan(void *blob, int xcvr_present)
 372 {
 373         const char *xcvr_status = "disabled";
 374
 375         if (xcvr_present) {
 376                 if (karo_fdt_flexcan_enabled(blob)) {
 377                         karo_fdt_set_lcd_pins(blob, "lcdif_23bit_pins_a");
 378                         xcvr_status = "okay";
 379                 } else {
 380                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 381                 }
 382         } else {
 383                 const char *otg_mode = getenv("otg_mode");
 384
 385                 if (otg_mode && (strcmp(otg_mode, "host") == 0))
 386                         karo_fdt_enable_node(blob, "can1", 0);
 387
 388                 karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 389         }
 390         fdt_find_and_setprop(blob, "/regulators/can-xcvr", "status",
 391                         xcvr_status, strlen(xcvr_status) + 1, 1);
 392 }
 393
 394 void karo_fdt_del_prop(void *blob, const char *compat, phys_addr_t offs,
 395                         const char *prop)
 396 {
 397         int ret;
 398         int offset;
 399         const uint32_t *phandle;
 400         uint32_t ph = 0;
 401
 402         offset = fdt_node_offset_by_compat_reg(blob, compat, offs);
 403         if (offset <= 0)
 404                 return;
 405
 406         phandle = fdt_getprop(blob, offset, prop, NULL);
 407         if (phandle) {
 408                 ph = fdt32_to_cpu(*phandle);
 409         }
 410
 411         debug("Removing property '%s' from node %s@%08lx\n", prop, compat, offs);
 412         ret = fdt_delprop(blob, offset, prop);
 413         if (ret == 0)
 414                 karo_set_fdtsize(blob);
 415
 416         if (!ph)
 417                 return;
 418
 419         offset = fdt_node_offset_by_phandle(blob, ph);
 420         if (offset <= 0)
 421                 return;
 422
 423         debug("Removing node @ %08x\n", offset);
 424         fdt_del_node(blob, offset);
 425         karo_set_fdtsize(blob);
 426 }
 427
 428 static int fdt_init_fb_mode(const void *blob, int off, struct fb_videomode *fb_mode)
 429 {
 430         const uint32_t *prop;
 431
 432         memset(fb_mode, 0, sizeof(*fb_mode));
 433
 434         prop = fdt_getprop(blob, off, "clock-frequency", NULL);
 435         if (prop)
 436                 fb_mode->pixclock = KHZ2PICOS(fdt32_to_cpu(*prop) / 1000);
 437
 438         prop = fdt_getprop(blob, off, "hactive", NULL);
 439         if (prop)
 440                 fb_mode->xres = fdt32_to_cpu(*prop);
 441
 442         prop = fdt_getprop(blob, off, "vactive", NULL);
 443         if (prop)
 444                 fb_mode->yres = fdt32_to_cpu(*prop);
 445
 446         prop = fdt_getprop(blob, off, "hback-porch", NULL);
 447         if (prop)
 448                 fb_mode->left_margin = fdt32_to_cpu(*prop);
 449
 450         prop = fdt_getprop(blob, off, "hsync-len", NULL);
 451         if (prop)
 452                 fb_mode->hsync_len = fdt32_to_cpu(*prop);
 453
 454         prop = fdt_getprop(blob, off, "hfront-porch", NULL);
 455         if (prop)
 456                 fb_mode->right_margin = fdt32_to_cpu(*prop);
 457
 458         prop = fdt_getprop(blob, off, "vback-porch", NULL);
 459         if (prop)
 460                 fb_mode->upper_margin = fdt32_to_cpu(*prop);
 461
 462         prop = fdt_getprop(blob, off, "vsync-len", NULL);
 463         if (prop)
 464                 fb_mode->vsync_len = fdt32_to_cpu(*prop);
 465
 466         prop = fdt_getprop(blob, off, "vfront-porch", NULL);
 467         if (prop)
 468                 fb_mode->lower_margin = fdt32_to_cpu(*prop);
 469
 470         prop = fdt_getprop(blob, off, "hsync-active", NULL);
 471         if (prop)
 472                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 473
 474         prop = fdt_getprop(blob, off, "vsync-active", NULL);
 475         if (prop)
 476                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 477
 478         prop = fdt_getprop(blob, off, "de-active", NULL);
 479         if (prop)
 480                 fb_mode->sync |= *prop ? 0 : FB_SYNC_OE_LOW_ACT;
 481
 482         prop = fdt_getprop(blob, off, "pixelclk-active", NULL);
 483         if (prop)
 484                 fb_mode->sync |= *prop ? 0 : FB_SYNC_CLK_LAT_FALL;
 485
 486         return 0;
 487 }
 488
 489 static int fdt_update_native_fb_mode(void *blob, int off)
 490 {
 491         int ret;
 492         uint32_t ph;
 493
 494         ret = fdt_increase_size(blob, 64);
 495         if (ret) {
 496                 printf("Warning: Failed to increase FDT size: %d\n", ret);
 497         }
 498         debug("Creating phandle at offset %d\n", off);
 499         ph = fdt_create_phandle(blob, off);
 500         if (!ph) {
 501                 printf("Failed to create phandle for video timing\n");
 502                 return -ENOMEM;
 503         }
 504
 505         debug("phandle of %s @ %06x=%04x\n", fdt_get_name(blob, off, NULL),
 506                 off, ph);
 507         off = fdt_parent_offset(blob, off);
 508         if (off < 0)
 509                 return off;
 510         debug("parent offset=%06x\n", off);
 511         ret = fdt_setprop_cell(blob, off, "native-mode", ph);
 512         if (ret)
 513                 printf("Failed to set property 'native-mode': %d\n", ret);
 514         karo_set_fdtsize(blob);
 515         return ret;
 516 }
 517
 518 static int karo_fdt_find_video_timings(void *blob)
 519 {
 520         int off = fdt_path_offset(blob, "display");
 521         const char *subnode = "display-timings";
 522
 523         if (off < 0) {
 524                 debug("Could not find node 'display' in FDT: %d\n", off);
 525                 return off;
 526         }
 527
 528         off = fdt_subnode_offset(blob, off, subnode);
 529         if (off < 0) {
 530                 debug("Could not find node '%s' in FDT: %d\n", subnode, off);
 531         }
 532         return off;
 533 }
 534
 535 int karo_fdt_get_fb_mode(void *blob, const char *name, struct fb_videomode *fb_mode)
 536 {
 537         int off = karo_fdt_find_video_timings(blob);
 538
 539         if (off < 0)
 540                 return off;
 541         while (off > 0) {
 542                 const char *n, *endp;
 543                 int len, d = 1;
 544
 545                 off = fdt_next_node(blob, off, &d);
 546                 if (off < 0)
 547                         return off;
 548                 if (d < 1)
 549                         return -EINVAL;
 550                 if (d > 2) {
 551                         debug("Skipping node @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 552                         continue;
 553                 }
 554                 debug("parsing subnode @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 555
 556                 n = fdt_getprop(blob, off, "panel-name", &len);
 557                 if (!n) {
 558                         n = fdt_get_name(blob, off, NULL);
 559                         if (strcasecmp(n, name) == 0) {
 560                                 break;
 561                         }
 562                 } else {
 563                         int found = 0;
 564
 565                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 566                                 debug("Checking panel-name '%s'\n", n);
 567                                 if (strcasecmp(n, name) == 0) {
 568                                         debug("Using node %s @ %04x\n",
 569                                                 fdt_get_name(blob, off, NULL), off);
 570                                         found = 1;
 571                                         break;
 572                                 }
 573                         }
 574                         if (found)
 575                                 break;
 576                 }
 577         }
 578         if (off > 0) {
 579                 return fdt_init_fb_mode(blob, off, fb_mode);
 580         }
 581         return -EINVAL;
 582 }
 583
 584 #define SET_FB_PROP(n, v) ({                                            \
 585         int ret;                                                        \
 586         ret = fdt_setprop_u32(blob, off, n, v);                         \
 587         if (ret) {                                                      \
 588                 printf("Failed to set property %s: %d\n", name, ret);   \
 589         }                                                               \
 590         ret;                                                            \
 591 })
 592
 593
 594 int karo_fdt_create_fb_mode(void *blob, const char *name,
 595                         struct fb_videomode *fb_mode)
 596 {
 597         int off = fdt_path_offset(blob, "display");
 598         int ret;
 599         const char *subnode = "display-timings";
 600
 601         if (off < 0) {
 602                 printf("'display' node not found in FDT\n");
 603                 return off;
 604         }
 605
 606         ret = fdt_increase_size(blob, 512);
 607         if (ret) {
 608                 printf("Failed to increase FDT size: %d\n", ret);
 609                 return ret;
 610         }
 611
 612         ret = fdt_subnode_offset(blob, off, subnode);
 613         if (ret < 0) {
 614                 debug("Could not find node '%s' in FDT: %d\n", subnode, ret);
 615                 ret = fdt_add_subnode(blob, off, subnode);
 616                 if (ret < 0) {
 617                         printf("Failed to add %s subnode: %d\n", subnode, ret);
 618                         return ret;
 619                 }
 620         }
 621
 622         ret = fdt_add_subnode(blob, ret, name);
 623         if (ret < 0) {
 624                 printf("Failed to add %s subnode: %d\n", name, 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 static int karo_fdt_set_display_alias(void *blob, const char *path,
 677                                 const char *name)
 678 {
 679         int ret;
 680         int off;
 681         size_t size = strlen(path) + strlen(name) + 2;
 682         char *display;
 683
 684         display = malloc(size);
 685         if (display == NULL) {
 686                 printf("%s: Failed to allocate buffer\n", __func__);
 687                 return -ENOMEM;
 688         }
 689         sprintf(display, "%s/%s", path, name);
 690         if (strlen(display) != size - 1)
 691                 hang();
 692         off = fdt_path_offset(blob, "/aliases");
 693         if (off == FDT_ERR_BADMAGIC)
 694                 return -EINVAL;
 695         ret = fdt_resize(blob);
 696         if (ret < 0) {
 697                 printf("%s: Failed to resize FDT: %s\n",
 698                         __func__, fdt_strerror(ret));
 699         }
 700         if (off < 0) {
 701                 off = fdt_add_subnode(blob, 0, "aliases");
 702                 if (off < 0) {
 703                         printf("%s: Failed to create 'aliases' node: %s\n",
 704                                 __func__, fdt_strerror(off));
 705                         return off;
 706                 }
 707         }
 708         ret = fdt_setprop_string(blob, off, "display", display);
 709         debug("setprop_string(display='%s') returned %d\n", display, ret);
 710         return ret;
 711 }
 712
 713 const char *karo_fdt_set_display(const char *video_mode, const char *lcd_path,
 714                                 const char *lvds_path)
 715 {
 716         const char *vmode = NULL;
 717         int ret;
 718         void *blob = working_fdt;
 719
 720         if (video_mode == NULL || strlen(video_mode) == 0)
 721                 return NULL;
 722
 723         vmode = strchr(video_mode, ':');
 724
 725         if (lvds_path == NULL)
 726                 return vmode ? vmode + 1 : video_mode;
 727
 728         if (lvds_path != NULL && vmode != NULL) {
 729                 if (strncmp(video_mode, "LVDS:", 5) == 0 ||
 730                         strncmp(video_mode, "LVDS0:", 6) == 0) {
 731                         ret = karo_fdt_set_display_alias(blob, lvds_path,
 732                                                         "lvds-channel@0");
 733                 } else if (strncmp(video_mode, "LVDS1:", 6) == 0) {
 734                         ret = karo_fdt_set_display_alias(blob, lvds_path,
 735                                                         "lvds-channel@1");
 736                 } else {
 737                         debug("%s: Syntax error in video_mode\n", __func__);
 738                         return vmode + 1;
 739                 }
 740                 video_mode = vmode + 1;
 741         } else {
 742                 int off;
 743
 744                 ret = karo_fdt_set_display_alias(blob, lcd_path,
 745                                                 "display@di0");
 746
 747                 off = fdt_path_offset(blob, "lvds0");
 748                 if (off >= 0) {
 749                         ret = fdt_set_node_status(blob, off,
 750                                                 FDT_STATUS_DISABLED, 0);
 751                 }
 752                 off = fdt_path_offset(blob, "lvds1");
 753                 if (off >= 0) {
 754                         ret = fdt_set_node_status(blob, off,
 755                                                 FDT_STATUS_DISABLED, 0);
 756                 }
 757         }
 758         if (ret) {
 759                 printf("%s: failed to set 'display' alias: %s\n",
 760                         __func__, fdt_strerror(ret));
 761         }
 762         return video_mode;
 763 }
 764
 765 int karo_fdt_update_fb_mode(void *blob, const char *name)
 766 {
 767         int off = fdt_path_offset(blob, "display");
 768         const char *subnode = "display-timings";
 769
 770         if (off < 0)
 771                 return off;
 772
 773         if (name == NULL) {
 774                 int ret;
 775
 776                 debug("Disabling node '%s' at %03x\n",
 777                         fdt_get_name(blob, off, NULL), off);
 778                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 779                 return ret;
 780         }
 781
 782         off = fdt_subnode_offset(blob, off, subnode);
 783         if (off < 0) {
 784                 debug("Could not find node '%s' in FDT: %d\n", subnode, off);
 785                 return off;
 786         }
 787         while (off > 0) {
 788                 const char *n, *endp;
 789                 int len, d = 1;
 790
 791                 off = fdt_next_node(blob, off, &d);
 792                 if (off < 0)
 793                         return off;
 794                 if (d < 1)
 795                         return -EINVAL;
 796                 if (d > 2) {
 797                         debug("Skipping node @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 798                         continue;
 799                 }
 800                 debug("parsing subnode @ %04x %s depth %d\n", off, fdt_get_name(blob, off, NULL), d);
 801
 802                 n = fdt_getprop(blob, off, "panel-name", &len);
 803                 if (!n) {
 804                         n = fdt_get_name(blob, off, NULL);
 805                         if (strcasecmp(n, name) == 0) {
 806                                 break;
 807                         }
 808                 } else {
 809                         int found = 0;
 810
 811                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 812                                 debug("Checking panel-name '%s'\n", n);
 813                                 if (strcasecmp(n, name) == 0) {
 814                                         debug("Using node %s @ %04x\n",
 815                                                 fdt_get_name(blob, off, NULL), off);
 816                                         found = 1;
 817                                         break;
 818                                 }
 819                         }
 820                         if (found)
 821                                 break;
 822                 }
 823         }
 824         if (off > 0)
 825                 return fdt_update_native_fb_mode(blob, off);
 826         return off;
 827 }