board/karo/common/fdt.c

   1 /*
   2  * (C) Copyright 2012-2014 Lothar Waßmann <LW@KARO-electronics.de>
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16 */
  17
  18 #include <common.h>
  19 #include <errno.h>
  20 #include <libfdt.h>
  21 #include <fdt_support.h>
  22 #include <nand.h>
  23 #include <mxcfb.h>
  24 #include <linux/list.h>
  25 #include <linux/fb.h>
  26 #include <jffs2/load_kernel.h>
  27 #include <malloc.h>
  28
  29 #include "karo.h"
  30
  31 #ifdef CONFIG_MAX_DTB_SIZE
  32 #define MAX_DTB_SIZE    CONFIG_MAX_DTB_SIZE
  33 #else
  34 #define MAX_DTB_SIZE    SZ_64K
  35 #endif
  36
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 static void karo_set_fdtsize(void *fdt)
  40 {
  41         size_t fdtsize = getenv_ulong("fdtsize", 16, 0);
  42
  43         if (fdtsize == fdt_totalsize(fdt)) {
  44                 return;
  45         }
  46         debug("FDT size changed from %u to %u\n",
  47                 fdtsize, fdt_totalsize(fdt));
  48         setenv_hex("fdtsize", fdt_totalsize(fdt));
  49 }
  50
  51 static void *karo_fdt_load_dtb(void)
  52 {
  53         int ret;
  54         void *fdt;
  55
  56         if (getenv("fdtaddr") == NULL)
  57                 setenv_hex("fdtaddr", CONFIG_SYS_FDT_ADDR);
  58         fdt = (void *)getenv_ulong("fdtaddr", 16, CONFIG_SYS_FDT_ADDR);
  59
  60         if (had_ctrlc()) {
  61                 printf("aborting DTB load\n");
  62                 return NULL;
  63         }
  64
  65         /* clear FDT header in memory */
  66         memset(fdt, 0, 4);
  67
  68         ret = karo_load_part("dtb", fdt, MAX_DTB_SIZE);
  69         if (ret) {
  70                 printf("Failed to load dtb from flash: %d\n", ret);
  71                 return NULL;
  72         }
  73
  74         if (fdt_check_header(fdt)) {
  75                 debug("No valid DTB in flash\n");
  76                 return NULL;
  77         }
  78         debug("Using DTB from flash\n");
  79         karo_set_fdtsize(fdt);
  80         return fdt;
  81 }
  82
  83 void karo_fdt_move_fdt(void)
  84 {
  85         void *fdt;
  86         unsigned long fdt_addr = getenv_ulong("fdtaddr", 16, 0);
  87
  88         if (working_fdt) {
  89                 debug("DTB already loaded\n");
  90                 return;
  91         }
  92
  93         setenv("fdtsize", 0);
  94
  95         if (!fdt_addr) {
  96                 fdt_addr = CONFIG_SYS_FDT_ADDR;
  97                 printf("fdtaddr is not set; using default: %08lx\n",
  98                         fdt_addr);
  99         }
 100
 101         fdt = karo_fdt_load_dtb();
 102         if (fdt == NULL) {
 103                 fdt = (void *)gd->fdt_blob;
 104                 if (fdt == NULL) {
 105 #ifdef CONFIG_OF_EMBED
 106                         printf("Compiled in FDT not found");
 107 #else
 108                         printf("No FDT found");
 109 #endif
 110                         printf("; creating empty DTB\n");
 111                         fdt = (void *)fdt_addr;
 112                         fdt_create_empty_tree(fdt, 256);
 113                 } else {
 114                         printf("No DTB in flash; using default DTB\n");
 115                 }
 116                 debug("Checking FDT header @ %p\n", fdt);
 117                 if (fdt_check_header(fdt)) {
 118                         printf("ERROR: No valid DTB found at %p\n", fdt);
 119                         return;
 120                 }
 121                 debug("Moving FDT from %p..%p to %08lx..%08lx\n",
 122                         fdt, fdt + fdt_totalsize(fdt) - 1,
 123                         fdt_addr, fdt_addr + fdt_totalsize(fdt) - 1);
 124                 memmove((void *)fdt_addr, fdt, fdt_totalsize(fdt));
 125         }
 126         set_working_fdt_addr(fdt_addr);
 127         gd->fdt_blob = fdt;
 128         karo_set_fdtsize(fdt);
 129 }
 130
 131 void karo_fdt_remove_node(void *blob, const char *node)
 132 {
 133         int off = fdt_path_offset(blob, node);
 134         int ret;
 135
 136         debug("Removing node '%s' from DT\n", node);
 137
 138         if (off < 0) {
 139                 printf("Could not find node '%s': %s\n", node,
 140                         fdt_strerror(off));
 141         } else {
 142                 ret = fdt_del_node(blob, off);
 143                 if (ret)
 144                         printf("Failed to remove node '%s': %s\n",
 145                                 node, fdt_strerror(ret));
 146         }
 147         karo_set_fdtsize(blob);
 148 }
 149
 150 void karo_fdt_enable_node(void *blob, const char *node, int enable)
 151 {
 152         int off = fdt_path_offset(blob, node);
 153
 154         debug("%sabling node '%s'\n", enable ? "En" : "Dis", node);
 155         if (off < 0) {
 156                 printf("Could not find node '%s': %s\n", node,
 157                         fdt_strerror(off));
 158                 return;
 159         }
 160         fdt_set_node_status(blob, off,
 161                         enable ? FDT_STATUS_OKAY : FDT_STATUS_DISABLED, 0);
 162
 163         karo_set_fdtsize(blob);
 164 }
 165
 166 static void fdt_disable_tp_node(void *blob, const char *name)
 167 {
 168         int offs = fdt_node_offset_by_compatible(blob, -1, name);
 169
 170         while (offs >= 0) {
 171                 debug("Disabling node '%s'\n", name);
 172                 fdt_set_node_status(blob, offs, FDT_STATUS_DISABLED, 0);
 173                 offs = fdt_node_offset_by_compatible(blob, offs, name);
 174         }
 175 }
 176
 177 void karo_fdt_fixup_touchpanel(void *blob, const char *panels[],
 178                         size_t num_panels)
 179 {
 180         int i;
 181         const char *model = getenv("touchpanel");
 182
 183         for (i = 0; i < num_panels; i++) {
 184                 const char *tp = panels[i];
 185
 186                 if (model != NULL) {
 187                         if (strcmp(model, tp) == 0)
 188                                 continue;
 189                         while (tp != NULL) {
 190                                 if (*tp != '\0' && strcmp(model, tp + 1) == 0)
 191                                         break;
 192                                 tp = strpbrk(tp + 1, ",-");
 193                         }
 194                         if (tp != NULL)
 195                                 continue;
 196                 }
 197                 fdt_disable_tp_node(blob, panels[i]);
 198         }
 199         karo_set_fdtsize(blob);
 200 }
 201
 202 static int karo_fdt_disable_node_phandle(void *blob, const char *parent,
 203                                         const char *name)
 204 {
 205         const uint32_t *ph;
 206         int off;
 207
 208         off = fdt_path_offset(blob, parent);
 209         if (off < 0) {
 210                 printf("Failed to find node '%s'\n", parent);
 211                 return off;
 212         }
 213
 214         ph = fdt_getprop(blob, off, name, NULL);
 215         if (ph == NULL) {
 216                 debug("Failed to find '%s' phandle in node '%s'\n", name,
 217                         fdt_get_name(blob, off, NULL));
 218                 return -FDT_ERR_NOTFOUND;
 219         }
 220
 221         off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 222         if (off <= 0) {
 223                 printf("Failed to find '%s' node via phandle %04x\n",
 224                         name, fdt32_to_cpu(*ph));
 225                 return -FDT_ERR_NOTFOUND;
 226         }
 227         return fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 228 }
 229
 230 void karo_fdt_fixup_usb_otg(void *blob, const char *node, const char *phy,
 231                         const char *phy_supply)
 232 {
 233         const char *otg_mode = getenv("otg_mode");
 234         int off;
 235         int ret;
 236         int disable_otg = 0;
 237         int disable_phy_pins = 0;
 238
 239         debug("OTG mode is '%s'\n", otg_mode ? otg_mode : "<UNSET>");
 240
 241         off = fdt_path_offset(blob, node);
 242         if (off < 0) {
 243                 debug("Failed to find node %s\n", node);
 244                 return;
 245         }
 246
 247         if (otg_mode && (strcasecmp(otg_mode, "device") == 0 ||
 248                                 strcasecmp(otg_mode, "gadget") == 0)) {
 249                 debug("Setting dr_mode to 'peripheral'\n");
 250                 ret = fdt_setprop_string(blob, off, "dr_mode", "peripheral");
 251                 disable_phy_pins = 1;
 252         } else if (otg_mode && strcasecmp(otg_mode, "host") == 0) {
 253                 debug("Setting dr_mode to 'host'\n");
 254                 ret = fdt_setprop_string(blob, off, "dr_mode", "host");
 255         } else if (otg_mode && strcasecmp(otg_mode, "otg") == 0) {
 256                 debug("Setting dr_mode to 'otg'\n");
 257                 ret = fdt_setprop_string(blob, off, "dr_mode", "otg");
 258         } else {
 259                 if (otg_mode && strcasecmp(otg_mode, "none") != 0)
 260                         printf("Invalid 'otg_mode' setting '%s'; disabling usbotg port\n",
 261                                 otg_mode);
 262                 disable_otg = 1;
 263                 ret = 0;
 264         }
 265
 266         if ((!disable_phy_pins && !disable_otg) || ret)
 267                 goto out;
 268
 269         ret = karo_fdt_disable_node_phandle(blob, node, phy_supply);
 270         if (ret && ret == -FDT_ERR_NOTFOUND) {
 271                 const uint32_t *ph;
 272
 273                 ph = fdt_getprop(blob, off, phy, NULL);
 274                 if (ph == NULL) {
 275                         printf("Failed to find '%s' phandle in node '%s'\n",
 276                                 phy, node);
 277                         ret = -FDT_ERR_NOTFOUND;
 278                         goto out;
 279                 }
 280                 off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 281                 if (off < 0) {
 282                         printf("Failed to find '%s' node via phandle %04x\n",
 283                                 phy, fdt32_to_cpu(*ph));
 284                         ret = off;
 285                         goto out;
 286                 }
 287                 ph = fdt_getprop(blob, off, phy_supply, NULL);
 288                 if (ph == NULL) {
 289                         debug("Failed to find '%s' phandle in node '%s'\n",
 290                                 phy_supply, fdt_get_name(blob, off, NULL));
 291                         ret = -FDT_ERR_NOTFOUND;
 292                         goto disable_otg;
 293                 }
 294                 ret = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 295                 if (ret > 0) {
 296                         debug("Disabling node %s via phandle %s:%s\n",
 297                                 fdt_get_name(blob, ret, NULL),
 298                                 fdt_get_name(blob, off, NULL), phy_supply);
 299                         ret = fdt_set_node_status(blob, ret,
 300                                                 FDT_STATUS_DISABLED, 0);
 301                 }
 302         }
 303         if (ret && ret != -FDT_ERR_NOTFOUND)
 304                 goto out;
 305
 306 disable_otg:
 307         if (disable_otg) {
 308                 debug("Disabling '%s'\n", fdt_get_name(blob, off, NULL));
 309                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 310                 if (ret > 0)
 311                         ret = karo_fdt_disable_node_phandle(blob, node, phy);
 312         } else if (disable_phy_pins) {
 313                 debug("Removing '%s' from node '%s'\n", phy_supply,
 314                         fdt_get_name(blob, off, NULL));
 315                 ret = fdt_delprop(blob, off, phy_supply);
 316         }
 317
 318 out:
 319         if (ret && ret != -FDT_ERR_NOTFOUND)
 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         int ret;
 381         const char *xcvr_status = "disabled";
 382         const char *otg_mode = getenv("otg_mode");
 383
 384         if (xcvr_present) {
 385                 if (karo_fdt_flexcan_enabled(blob)) {
 386                         if (!is_lvds()) {
 387                                 debug("Changing LCD to use 23bits only\n");
 388                                 karo_fdt_set_lcd_pins(blob, "lcdif_23bit_pins_a");
 389                                 xcvr_status = NULL;
 390                         }
 391                 } else if (!is_lvds()) {
 392                         debug("Changing LCD to use 24bits\n");
 393                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 394                 }
 395         } else {
 396                 int off = fdt_path_offset(blob, "can0");
 397
 398                 if (off >= 0)
 399                         fdt_delprop(blob, off, "xceiver-supply");
 400                 off = fdt_path_offset(blob, "can1");
 401                 if (off >= 0)
 402                         fdt_delprop(blob, off, "xceiver-supply");
 403                 if (!is_lvds())
 404                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 405         }
 406
 407         if (otg_mode && strcasecmp(otg_mode, "host") == 0)
 408                 karo_fdt_enable_node(blob, "can1", 0);
 409
 410         if (xcvr_status) {
 411                 debug("Disabling CAN XCVR\n");
 412                 ret = fdt_find_and_setprop(blob, "reg_can_xcvr", "status",
 413                                         xcvr_status, strlen(xcvr_status) + 1, 1);
 414                 if (ret)
 415                         printf("Failed to disable CAN transceiver switch: %s\n",
 416                                 fdt_strerror(ret));
 417         }
 418 }
 419
 420 void karo_fdt_del_prop(void *blob, const char *compat, u32 offs,
 421                         const char *propname)
 422 {
 423         int offset = -1;
 424         const fdt32_t *reg = NULL;
 425
 426         while (1) {
 427                 offset = fdt_node_offset_by_compatible(blob, offset, compat);
 428                 if (offset <= 0)
 429                         return;
 430
 431                 reg = fdt_getprop(blob, offset, "reg", NULL);
 432                 if (reg == NULL)
 433                         return;
 434
 435                 if (fdt32_to_cpu(*reg) == offs)
 436                         break;
 437         }
 438         debug("Removing property '%s' from node %s@%x\n",
 439                 propname, compat, offs);
 440         fdt_delprop(blob, offset, propname);
 441
 442         karo_set_fdtsize(blob);
 443 }
 444
 445 static int fdt_init_fb_mode(const void *blob, int off, struct fb_videomode *fb_mode)
 446 {
 447         const uint32_t *prop;
 448
 449         memset(fb_mode, 0, sizeof(*fb_mode));
 450
 451         prop = fdt_getprop(blob, off, "clock-frequency", NULL);
 452         if (prop)
 453                 fb_mode->pixclock = KHZ2PICOS(fdt32_to_cpu(*prop) / 1000);
 454
 455         prop = fdt_getprop(blob, off, "hactive", NULL);
 456         if (prop)
 457                 fb_mode->xres = fdt32_to_cpu(*prop);
 458
 459         prop = fdt_getprop(blob, off, "vactive", NULL);
 460         if (prop)
 461                 fb_mode->yres = fdt32_to_cpu(*prop);
 462
 463         prop = fdt_getprop(blob, off, "hback-porch", NULL);
 464         if (prop)
 465                 fb_mode->left_margin = fdt32_to_cpu(*prop);
 466
 467         prop = fdt_getprop(blob, off, "hsync-len", NULL);
 468         if (prop)
 469                 fb_mode->hsync_len = fdt32_to_cpu(*prop);
 470
 471         prop = fdt_getprop(blob, off, "hfront-porch", NULL);
 472         if (prop)
 473                 fb_mode->right_margin = fdt32_to_cpu(*prop);
 474
 475         prop = fdt_getprop(blob, off, "vback-porch", NULL);
 476         if (prop)
 477                 fb_mode->upper_margin = fdt32_to_cpu(*prop);
 478
 479         prop = fdt_getprop(blob, off, "vsync-len", NULL);
 480         if (prop)
 481                 fb_mode->vsync_len = fdt32_to_cpu(*prop);
 482
 483         prop = fdt_getprop(blob, off, "vfront-porch", NULL);
 484         if (prop)
 485                 fb_mode->lower_margin = fdt32_to_cpu(*prop);
 486
 487         prop = fdt_getprop(blob, off, "hsync-active", NULL);
 488         if (prop)
 489                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 490
 491         prop = fdt_getprop(blob, off, "vsync-active", NULL);
 492         if (prop)
 493                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 494
 495         prop = fdt_getprop(blob, off, "de-active", NULL);
 496         if (prop)
 497                 fb_mode->sync |= *prop ? 0 : FB_SYNC_OE_LOW_ACT;
 498
 499         prop = fdt_getprop(blob, off, "pixelclk-active", NULL);
 500         if (prop)
 501                 fb_mode->sync |= *prop ? 0 : FB_SYNC_CLK_LAT_FALL;
 502
 503         return 0;
 504 }
 505
 506 static int fdt_update_native_fb_mode(void *blob, int off)
 507 {
 508         int ret;
 509         uint32_t ph;
 510
 511         ret = fdt_increase_size(blob, 64);
 512         if (ret) {
 513                 printf("Warning: Failed to increase FDT size: %s\n",
 514                         fdt_strerror(ret));
 515         }
 516         debug("Creating phandle at offset %d\n", off);
 517         ph = fdt_create_phandle(blob, off);
 518         if (!ph) {
 519                 printf("Failed to create phandle for video timing\n");
 520                 return -ENOMEM;
 521         }
 522
 523         debug("phandle of %s @ %06x=%04x\n", fdt_get_name(blob, off, NULL),
 524                 off, ph);
 525         off = fdt_parent_offset(blob, off);
 526         if (off < 0)
 527                 return off;
 528         debug("parent offset=%06x\n", off);
 529         ret = fdt_setprop_cell(blob, off, "native-mode", ph);
 530         if (ret)
 531                 printf("Failed to set property 'native-mode': %s\n",
 532                         fdt_strerror(ret));
 533         karo_set_fdtsize(blob);
 534         return ret;
 535 }
 536
 537 static int karo_fdt_find_video_timings(void *blob)
 538 {
 539         int off = fdt_path_offset(blob, "display");
 540         const char *subnode = "display-timings";
 541
 542         if (off < 0) {
 543                 debug("Could not find node 'display' in FDT: %s\n",
 544                         fdt_strerror(off));
 545                 return off;
 546         }
 547
 548         off = fdt_subnode_offset(blob, off, subnode);
 549         if (off < 0) {
 550                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 551                         fdt_strerror(off));
 552         }
 553         return off;
 554 }
 555
 556 static int karo_fdt_check_panel_name(const char *pn, const char *name, int len)
 557 {
 558         const char *endp = pn + len;
 559
 560         if (len < 0)
 561                 return 0;
 562         while (pn < endp) {
 563                 if (strcasecmp(pn, name) == 0)
 564                         return 1;
 565                 pn += strlen(pn) + 1;
 566         }
 567         return 0;
 568 }
 569
 570 static int karo_fdt_find_panel(const void *blob, int off, const char *name)
 571 {
 572         debug("Searching panel '%s'\n", name);
 573         while (off > 0) {
 574                 const char *pn;
 575                 int d = 1;
 576                 int len;
 577
 578                 off = fdt_next_node(blob, off, &d);
 579                 if (off < 0)
 580                         return off;
 581                 if (d < 1)
 582                         return -EINVAL;
 583                 if (d > 2) {
 584                         debug("Skipping node @ %04x %s depth %d\n", off,
 585                                 fdt_get_name(blob, off, NULL), d);
 586                         continue;
 587                 }
 588
 589                 pn = fdt_get_name(blob, off, NULL);
 590                 debug("Checking node name '%s'\n", pn);
 591                 if (strcasecmp(pn, name) == 0)
 592                         break;
 593                 pn = fdt_getprop(blob, off, "u-boot,panel-name", &len);
 594                 if (!pn)
 595                         continue;
 596                 if (karo_fdt_check_panel_name(pn, name, len))
 597                         break;
 598         }
 599         if (off > 0)
 600                 debug("Found LCD panel: '%s' @ off %03x\n",
 601                       fdt_get_name(blob, off, NULL), off);
 602         return off;
 603 }
 604
 605 int karo_fdt_get_fb_mode(void *blob, const char *name,
 606                          struct fb_videomode *fb_mode)
 607 {
 608         int off = karo_fdt_find_video_timings(blob);
 609
 610         if (off < 0)
 611                 return off;
 612         off = karo_fdt_find_panel(blob, off, name);
 613         if (off > 0) {
 614                 return fdt_init_fb_mode(blob, off, fb_mode);
 615         }
 616         return -EINVAL;
 617 }
 618
 619 #define SET_FB_PROP(n, v) ({                                            \
 620         int ret;                                                        \
 621         ret = fdt_setprop_u32(blob, off, n, v);                         \
 622         if (ret) {                                                      \
 623                 printf("Failed to set property %s: %s\n", name,         \
 624                         fdt_strerror(ret));                             \
 625         }                                                               \
 626         ret;                                                            \
 627 })
 628
 629
 630 int karo_fdt_create_fb_mode(void *blob, const char *name,
 631                         struct fb_videomode *fb_mode)
 632 {
 633         int off = fdt_path_offset(blob, "display");
 634         int ret;
 635         const char *subnode = "display-timings";
 636
 637         if (off < 0) {
 638                 printf("'display' node not found in FDT\n");
 639                 return off;
 640         }
 641
 642         ret = fdt_increase_size(blob, 512);
 643         if (ret) {
 644                 printf("Failed to increase FDT size: %s\n", fdt_strerror(ret));
 645                 return ret;
 646         }
 647
 648         ret = fdt_subnode_offset(blob, off, subnode);
 649         if (ret < 0) {
 650                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 651                         fdt_strerror(ret));
 652                 ret = fdt_add_subnode(blob, off, subnode);
 653                 if (ret < 0) {
 654                         printf("Failed to add %s subnode: %s\n", subnode,
 655                                 fdt_strerror(ret));
 656                         return ret;
 657                 }
 658         }
 659
 660         ret = fdt_add_subnode(blob, ret, name);
 661         if (ret < 0) {
 662                 printf("Failed to add %s subnode: %s\n", name,
 663                         fdt_strerror(ret));
 664                 return ret;
 665         }
 666         off = ret;
 667
 668         ret = SET_FB_PROP("clock-frequency",
 669                         PICOS2KHZ(fb_mode->pixclock) * 1000);
 670         if (ret)
 671                 goto out;
 672         ret = SET_FB_PROP("hactive", fb_mode->xres);
 673         if (ret)
 674                 goto out;
 675         ret = SET_FB_PROP("vactive", fb_mode->yres);
 676         if (ret)
 677                 goto out;
 678         ret = SET_FB_PROP("hback-porch", fb_mode->left_margin);
 679         if (ret)
 680                 goto out;
 681         ret = SET_FB_PROP("hsync-len", fb_mode->hsync_len);
 682         if (ret)
 683                 goto out;
 684         ret = SET_FB_PROP("hfront-porch", fb_mode->right_margin);
 685         if (ret)
 686                 goto out;
 687         ret = SET_FB_PROP("vback-porch", fb_mode->upper_margin);
 688         if (ret)
 689                 goto out;
 690         ret = SET_FB_PROP("vsync-len", fb_mode->vsync_len);
 691         if (ret)
 692                 goto out;
 693         ret = SET_FB_PROP("vfront-porch", fb_mode->lower_margin);
 694         if (ret)
 695                 goto out;
 696         ret = SET_FB_PROP("hsync-active",
 697                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 698         if (ret)
 699                 goto out;
 700         ret = SET_FB_PROP("vsync-active",
 701                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 702         if (ret)
 703                 goto out;
 704         ret = SET_FB_PROP("de-active",
 705                         !(fb_mode->sync & FB_SYNC_OE_LOW_ACT));
 706         if (ret)
 707                 goto out;
 708         ret = SET_FB_PROP("pixelclk-active",
 709                         !(fb_mode->sync & FB_SYNC_CLK_LAT_FALL));
 710 out:
 711         karo_set_fdtsize(blob);
 712         return ret;
 713 }
 714
 715 int karo_fdt_update_fb_mode(void *blob, const char *name,
 716                             const char *panel_name)
 717 {
 718         int ret;
 719         int off = fdt_path_offset(blob, "display");
 720         int panel_off = -1;
 721         const char *subnode = "display-timings";
 722
 723         if (panel_name)
 724                 panel_off = fdt_path_offset(blob, panel_name);
 725
 726         if (off < 0 && panel_off < 0)
 727                 return off;
 728
 729         if (name == NULL) {
 730                 debug("Disabling node '%s' at %03x\n",
 731                         fdt_get_name(blob, off, NULL), off);
 732                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 733                 if (ret)
 734                         printf("Failed to disable node '%s': %s\n",
 735                                fdt_get_name(blob, off, NULL),
 736                                fdt_strerror(ret));
 737                 if (!panel_name)
 738                         return ret;
 739
 740                 panel_off = fdt_path_offset(blob, panel_name);
 741                 if (panel_off < 0)
 742                         return 0;
 743                 return fdt_set_node_status(blob, panel_off,
 744                                            FDT_STATUS_DISABLED, 0);
 745         }
 746
 747         off = fdt_subnode_offset(blob, off, subnode);
 748         if (off < 0) {
 749                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 750                         fdt_strerror(off));
 751                 return off;
 752         }
 753         off = karo_fdt_find_panel(blob, off, name);
 754         if (off > 0)
 755                 ret = fdt_update_native_fb_mode(blob, off);
 756         else
 757                 ret = 0;
 758         if (!panel_name)
 759                 return ret;
 760
 761         off = fdt_path_offset(blob, "display/display-timings");
 762         off = karo_fdt_find_panel(blob, off, name);
 763         panel_off = fdt_path_offset(blob, panel_name);
 764         if (panel_off > 0) {
 765                 char *pn;
 766
 767                 name = fdt_getprop(blob, off, "u-boot,panel-name",
 768                                    NULL);
 769                 if (!name)
 770                         return 0;
 771                 pn = strdup(name);
 772                 if (!pn)
 773                         return -ENOMEM;
 774                 debug("%s@%d: Updating 'compatible' property of '%s' from '%s' to '%s'\n",
 775                       __func__, __LINE__, fdt_get_name(blob, panel_off, NULL),
 776                       (char *)fdt_getprop(blob, panel_off, "compatible", NULL),
 777                       pn);
 778
 779                 ret = fdt_setprop_string(blob, panel_off, "compatible",
 780                                          pn);
 781                 if (ret)
 782                         printf("Failed to set 'compatible' property of node '%s': %s\n",
 783                                fdt_get_name(blob, panel_off, NULL),
 784                                fdt_strerror(off));
 785                 free(pn);
 786         }
 787         return ret;
 788 }
 789
 790 #ifdef CONFIG_SYS_LVDS_IF
 791 int karo_fdt_get_lcd_bus_width(const void *blob, int default_width)
 792 {
 793         int off = fdt_path_offset(blob, "display");
 794
 795         if (off >= 0) {
 796                 const uint32_t *prop;
 797
 798                 prop = fdt_getprop(blob, off, "fsl,data-width", NULL);
 799                 if (prop)
 800                         return fdt32_to_cpu(*prop);
 801         }
 802         return default_width;
 803 }
 804
 805 int karo_fdt_get_lvds_mapping(const void *blob, int default_mapping)
 806 {
 807         int off = fdt_path_offset(blob, "display");
 808
 809         if (off >= 0) {
 810                 const char *prop;
 811
 812                 prop = fdt_getprop(blob, off, "fsl,data-mapping", NULL);
 813                 if (prop)
 814                         return strcmp(prop, "jeida") == 0;
 815         }
 816         return default_mapping;
 817 }
 818
 819 u8 karo_fdt_get_lvds_channels(const void *blob)
 820 {
 821         static const char *lvds_chans[] = {
 822                 "lvds0",
 823                 "lvds1",
 824         };
 825         u8 lvds_chan_mask = 0;
 826         int i;
 827
 828         for (i = 0; i < ARRAY_SIZE(lvds_chans); i++) {
 829                 const char *status;
 830                 int off = fdt_path_offset(blob, lvds_chans[i]);
 831
 832                 if (off < 0)
 833                         continue;
 834
 835                 status = fdt_getprop(blob, off, "status", NULL);
 836                 if (status && strcmp(status, "okay") == 0) {
 837                         debug("%s is enabled\n", lvds_chans[i]);
 838                         lvds_chan_mask |= 1 << i;
 839                 }
 840         }
 841         return lvds_chan_mask;
 842 }
 843 #endif
 844
 845 int karo_fdt_get_backlight_polarity(const void *blob)
 846 {
 847 #ifdef CONFIG_SYS_LVDS_IF
 848         const char *backlight_node = "/backlight0";
 849 #else
 850         const char *backlight_node = "/backlight";
 851 #endif
 852         int off = fdt_path_offset(blob, "backlight"); /* first try alias */
 853         const struct fdt_property *prop;
 854         int len;
 855
 856         if (off < 0) {
 857                 /*
 858                  * if no 'backlight' alias exists try finding '/backlight0'
 859                  * or '/backlight' depending on LVDS or not
 860                  */
 861                 off = fdt_path_offset(blob, backlight_node);
 862                 if (off < 0) {
 863                         printf("%s node not found in DT\n", backlight_node);
 864                         return off;
 865                 }
 866         }
 867
 868         prop = fdt_get_property(blob, off, "pwms", &len);
 869         if (!prop)
 870                 printf("'pwms' property not found\n");
 871         else
 872                 debug("'pwms' property has len %d\n", len);
 873
 874         len /= sizeof(u32);
 875         if (prop && len > 3) {
 876                 const u32 *data = (const u32 *)prop->data;
 877                 return fdt32_to_cpu(data[3]) == 0;
 878         }
 879         return 0;
 880 }