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 = (void *)getenv_ulong("fdtaddr", 16, CONFIG_SYS_FDT_ADDR);
  55
  56         if (had_ctrlc()) {
  57                 printf("aborting DTB load\n");
  58                 return NULL;
  59         }
  60
  61         /* clear FDT header in memory */
  62         memset(fdt, 0, 4);
  63
  64         ret = karo_load_part("dtb", fdt, MAX_DTB_SIZE);
  65         if (ret) {
  66                 printf("Failed to load dtb from flash: %d\n", ret);
  67                 return NULL;
  68         }
  69
  70         if (fdt_check_header(fdt)) {
  71                 debug("No valid DTB in flash\n");
  72                 return NULL;
  73         }
  74         debug("Using DTB from flash\n");
  75         karo_set_fdtsize(fdt);
  76         return fdt;
  77 }
  78
  79 void karo_fdt_move_fdt(void)
  80 {
  81         void *fdt;
  82         unsigned long fdt_addr = getenv_ulong("fdtaddr", 16, 0);
  83
  84         if (working_fdt) {
  85                 debug("DTB already loaded\n");
  86                 return;
  87         }
  88
  89         setenv("fdtsize", 0);
  90
  91         if (!fdt_addr) {
  92                 fdt_addr = CONFIG_SYS_FDT_ADDR;
  93                 printf("fdtaddr is not set; using default: %08lx\n",
  94                         fdt_addr);
  95         }
  96
  97         fdt = karo_fdt_load_dtb();
  98         if (fdt == NULL) {
  99                 fdt = (void *)gd->fdt_blob;
 100                 if (fdt == NULL) {
 101 #ifdef CONFIG_OF_EMBED
 102                         printf("Compiled in FDT not found");
 103 #else
 104                         printf("No FDT found");
 105 #endif
 106                         printf("; creating empty DTB\n");
 107                         fdt = (void *)fdt_addr;
 108                         fdt_create_empty_tree(fdt, 256);
 109                 } else {
 110                         printf("No DTB in flash; using default DTB\n");
 111                 }
 112                 debug("Checking FDT header @ %p\n", fdt);
 113                 if (fdt_check_header(fdt)) {
 114                         printf("ERROR: No valid DTB found at %p\n", fdt);
 115                         return;
 116                 }
 117                 debug("Moving FDT from %p..%p to %08lx..%08lx\n",
 118                         fdt, fdt + fdt_totalsize(fdt) - 1,
 119                         fdt_addr, fdt_addr + fdt_totalsize(fdt) - 1);
 120                 memmove((void *)fdt_addr, fdt, fdt_totalsize(fdt));
 121         }
 122         set_working_fdt_addr((void *)fdt_addr);
 123         gd->fdt_blob = fdt;
 124         karo_set_fdtsize(fdt);
 125 }
 126
 127 void karo_fdt_remove_node(void *blob, const char *node)
 128 {
 129         int off = fdt_path_offset(blob, node);
 130         int ret;
 131
 132         debug("Removing node '%s' from DT\n", node);
 133
 134         if (off < 0) {
 135                 printf("Could not find node '%s': %s\n", node,
 136                         fdt_strerror(off));
 137         } else {
 138                 ret = fdt_del_node(blob, off);
 139                 if (ret)
 140                         printf("Failed to remove node '%s': %s\n",
 141                                 node, fdt_strerror(ret));
 142         }
 143         karo_set_fdtsize(blob);
 144 }
 145
 146 void karo_fdt_enable_node(void *blob, const char *node, int enable)
 147 {
 148         int off = fdt_path_offset(blob, node);
 149
 150         debug("%sabling node '%s'\n", enable ? "En" : "Dis", node);
 151         if (off < 0) {
 152                 printf("Could not find node '%s': %s\n", node,
 153                         fdt_strerror(off));
 154                 return;
 155         }
 156         fdt_set_node_status(blob, off,
 157                         enable ? FDT_STATUS_OKAY : FDT_STATUS_DISABLED, 0);
 158
 159         karo_set_fdtsize(blob);
 160 }
 161
 162 static void fdt_disable_tp_node(void *blob, const char *name)
 163 {
 164         int offs = fdt_node_offset_by_compatible(blob, -1, name);
 165
 166         while (offs >= 0) {
 167                 debug("Disabling node '%s'\n", name);
 168                 fdt_set_node_status(blob, offs, FDT_STATUS_DISABLED, 0);
 169                 offs = fdt_node_offset_by_compatible(blob, offs, name);
 170         }
 171 }
 172
 173 void karo_fdt_fixup_touchpanel(void *blob, const char *panels[],
 174                         size_t num_panels)
 175 {
 176         int i;
 177         const char *model = getenv("touchpanel");
 178
 179         for (i = 0; i < num_panels; i++) {
 180                 const char *tp = panels[i];
 181
 182                 if (model != NULL) {
 183                         if (strcmp(model, tp) == 0)
 184                                 continue;
 185                         while (tp != NULL) {
 186                                 if (*tp != '\0' && strcmp(model, tp + 1) == 0)
 187                                         break;
 188                                 tp = strpbrk(tp + 1, ",-");
 189                         }
 190                         if (tp != NULL)
 191                                 continue;
 192                 }
 193                 fdt_disable_tp_node(blob, panels[i]);
 194         }
 195         karo_set_fdtsize(blob);
 196 }
 197
 198 static int karo_fdt_disable_node_phandle(void *blob, const char *parent,
 199                                         const char *name)
 200 {
 201         const uint32_t *ph;
 202         int off;
 203
 204         off = fdt_path_offset(blob, parent);
 205         if (off < 0) {
 206                 printf("Failed to find node '%s'\n", parent);
 207                 return off;
 208         }
 209
 210         ph = fdt_getprop(blob, off, name, NULL);
 211         if (ph == NULL) {
 212                 debug("Failed to find '%s' phandle in node '%s'\n", name,
 213                         fdt_get_name(blob, off, NULL));
 214                 return -FDT_ERR_NOTFOUND;
 215         }
 216
 217         off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 218         if (off <= 0) {
 219                 printf("Failed to find '%s' node via phandle %04x\n",
 220                         name, fdt32_to_cpu(*ph));
 221                 return -FDT_ERR_NOTFOUND;
 222         }
 223         return fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 224 }
 225
 226 void karo_fdt_fixup_usb_otg(void *blob, const char *node, const char *phy,
 227                         const char *phy_supply)
 228 {
 229         const char *otg_mode = getenv("otg_mode");
 230         int off;
 231         int ret;
 232         int disable_otg = 0;
 233         int disable_phy_pins = 0;
 234
 235         debug("OTG mode is '%s'\n", otg_mode ? otg_mode : "<UNSET>");
 236
 237         off = fdt_path_offset(blob, node);
 238         if (off < 0) {
 239                 debug("Failed to find node %s\n", node);
 240                 return;
 241         }
 242
 243         if (otg_mode && (strcasecmp(otg_mode, "device") == 0 ||
 244                                 strcasecmp(otg_mode, "gadget") == 0)) {
 245                 debug("Setting dr_mode to 'peripheral'\n");
 246                 ret = fdt_setprop_string(blob, off, "dr_mode", "peripheral");
 247                 disable_phy_pins = 1;
 248         } else if (otg_mode && strcasecmp(otg_mode, "host") == 0) {
 249                 debug("Setting dr_mode to 'host'\n");
 250                 ret = fdt_setprop_string(blob, off, "dr_mode", "host");
 251         } else if (otg_mode && strcasecmp(otg_mode, "otg") == 0) {
 252                 debug("Setting dr_mode to 'otg'\n");
 253                 ret = fdt_setprop_string(blob, off, "dr_mode", "otg");
 254         } else {
 255                 if (otg_mode && strcasecmp(otg_mode, "none") != 0)
 256                         printf("Invalid 'otg_mode' setting '%s'; disabling usbotg port\n",
 257                                 otg_mode);
 258                 disable_otg = 1;
 259                 ret = 0;
 260         }
 261
 262         if ((!disable_phy_pins && !disable_otg) || ret)
 263                 goto out;
 264
 265         ret = karo_fdt_disable_node_phandle(blob, node, phy_supply);
 266         if (ret && ret == -FDT_ERR_NOTFOUND) {
 267                 const uint32_t *ph;
 268
 269                 ph = fdt_getprop(blob, off, phy, NULL);
 270                 if (ph == NULL) {
 271                         printf("Failed to find '%s' phandle in node '%s'\n",
 272                                 phy, node);
 273                         ret = -FDT_ERR_NOTFOUND;
 274                         goto out;
 275                 }
 276                 off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 277                 if (off < 0) {
 278                         printf("Failed to find '%s' node via phandle %04x\n",
 279                                 phy, fdt32_to_cpu(*ph));
 280                         ret = off;
 281                         goto out;
 282                 }
 283                 ph = fdt_getprop(blob, off, phy_supply, NULL);
 284                 if (ph == NULL) {
 285                         debug("Failed to find '%s' phandle in node '%s'\n",
 286                                 phy_supply, fdt_get_name(blob, off, NULL));
 287                         ret = -FDT_ERR_NOTFOUND;
 288                         goto disable_otg;
 289                 }
 290                 ret = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 291                 if (ret > 0) {
 292                         debug("Disabling node %s via phandle %s:%s\n",
 293                                 fdt_get_name(blob, ret, NULL),
 294                                 fdt_get_name(blob, off, NULL), phy_supply);
 295                         ret = fdt_set_node_status(blob, ret,
 296                                                 FDT_STATUS_DISABLED, 0);
 297                 }
 298         }
 299         if (ret && ret != -FDT_ERR_NOTFOUND)
 300                 goto out;
 301
 302 disable_otg:
 303         if (disable_otg) {
 304                 debug("Disabling '%s'\n", fdt_get_name(blob, off, NULL));
 305                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 306                 if (ret > 0)
 307                         ret = karo_fdt_disable_node_phandle(blob, node, phy);
 308         } else if (disable_phy_pins) {
 309                 debug("Removing '%s' from node '%s'\n", phy_supply,
 310                         fdt_get_name(blob, off, NULL));
 311                 ret = fdt_delprop(blob, off, phy_supply);
 312         }
 313
 314 out:
 315         if (ret && ret != -FDT_ERR_NOTFOUND)
 316                 printf("Failed to update usbotg: %s\n", fdt_strerror(ret));
 317         else
 318                 debug("node '%s' updated\n", node);
 319         karo_set_fdtsize(blob);
 320 }
 321
 322 static inline int karo_fdt_flexcan_enabled(void *blob)
 323 {
 324         static const char *can_ifs[] = {
 325                 "can0",
 326                 "can1",
 327         };
 328         size_t i;
 329
 330         for (i = 0; i < ARRAY_SIZE(can_ifs); i++) {
 331                 const char *status;
 332                 int off = fdt_path_offset(blob, can_ifs[i]);
 333
 334                 if (off < 0) {
 335                         debug("node '%s' not found\n", can_ifs[i]);
 336                         continue;
 337                 }
 338                 status = fdt_getprop(blob, off, "status", NULL);
 339                 if (status && strcmp(status, "okay") == 0) {
 340                         debug("%s is enabled\n", can_ifs[i]);
 341                         return 1;
 342                 }
 343         }
 344         debug("can driver is disabled\n");
 345         return 0;
 346 }
 347
 348 static inline void karo_fdt_set_lcd_pins(void *blob, const char *name)
 349 {
 350         int off = fdt_path_offset(blob, name);
 351         u32 ph;
 352         const struct fdt_property *pc;
 353         int len;
 354
 355         if (off < 0)
 356                 return;
 357
 358         ph = fdt_create_phandle(blob, off);
 359         if (!ph)
 360                 return;
 361
 362         off = fdt_path_offset(blob, "display");
 363         if (off < 0)
 364                 return;
 365
 366         pc = fdt_get_property(blob, off, "pinctrl-0", &len);
 367         if (!pc || len < sizeof(ph))
 368                 return;
 369
 370         memcpy((void *)pc->data, &ph, sizeof(ph));
 371         fdt_setprop_cell(blob, off, "pinctrl-0", ph);
 372 }
 373
 374 void karo_fdt_fixup_flexcan(void *blob, int xcvr_present)
 375 {
 376         int ret;
 377         const char *xcvr_status = "disabled";
 378         const char *otg_mode = getenv("otg_mode");
 379
 380         if (xcvr_present) {
 381                 if (karo_fdt_flexcan_enabled(blob)) {
 382                         if (!is_lvds()) {
 383                                 debug("Changing LCD to use 23bits only\n");
 384                                 karo_fdt_set_lcd_pins(blob, "lcdif_23bit_pins_a");
 385                                 xcvr_status = NULL;
 386                         }
 387                 } else if (!is_lvds()) {
 388                         debug("Changing LCD to use 24bits\n");
 389                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 390                 }
 391         } else {
 392                 int off = fdt_path_offset(blob, "can0");
 393
 394                 if (off >= 0)
 395                         fdt_delprop(blob, off, "xceiver-supply");
 396                 off = fdt_path_offset(blob, "can1");
 397                 if (off >= 0)
 398                         fdt_delprop(blob, off, "xceiver-supply");
 399                 if (!is_lvds())
 400                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 401         }
 402
 403         if (otg_mode && strcasecmp(otg_mode, "host") == 0)
 404                 karo_fdt_enable_node(blob, "can1", 0);
 405
 406         if (xcvr_status) {
 407                 debug("Disabling CAN XCVR\n");
 408                 ret = fdt_find_and_setprop(blob, "reg_can_xcvr", "status",
 409                                         xcvr_status, strlen(xcvr_status) + 1, 1);
 410                 if (ret)
 411                         printf("Failed to disable CAN transceiver switch: %s\n",
 412                                 fdt_strerror(ret));
 413         }
 414 }
 415
 416 void karo_fdt_del_prop(void *blob, const char *compat, u32 offs,
 417                         const char *propname)
 418 {
 419         int offset = -1;
 420         const fdt32_t *reg = NULL;
 421
 422         while (1) {
 423                 offset = fdt_node_offset_by_compatible(blob, offset, compat);
 424                 if (offset <= 0)
 425                         return;
 426
 427                 reg = fdt_getprop(blob, offset, "reg", NULL);
 428                 if (reg == NULL)
 429                         return;
 430
 431                 if (fdt32_to_cpu(*reg) == offs)
 432                         break;
 433         }
 434         debug("Removing property '%s' from node %s@%x\n",
 435                 propname, compat, offs);
 436         fdt_delprop(blob, offset, propname);
 437
 438         karo_set_fdtsize(blob);
 439 }
 440
 441 static int fdt_init_fb_mode(const void *blob, int off, struct fb_videomode *fb_mode)
 442 {
 443         const uint32_t *prop;
 444
 445         memset(fb_mode, 0, sizeof(*fb_mode));
 446
 447         prop = fdt_getprop(blob, off, "clock-frequency", NULL);
 448         if (prop)
 449                 fb_mode->pixclock = KHZ2PICOS(fdt32_to_cpu(*prop) / 1000);
 450
 451         prop = fdt_getprop(blob, off, "hactive", NULL);
 452         if (prop)
 453                 fb_mode->xres = fdt32_to_cpu(*prop);
 454
 455         prop = fdt_getprop(blob, off, "vactive", NULL);
 456         if (prop)
 457                 fb_mode->yres = fdt32_to_cpu(*prop);
 458
 459         prop = fdt_getprop(blob, off, "hback-porch", NULL);
 460         if (prop)
 461                 fb_mode->left_margin = fdt32_to_cpu(*prop);
 462
 463         prop = fdt_getprop(blob, off, "hsync-len", NULL);
 464         if (prop)
 465                 fb_mode->hsync_len = fdt32_to_cpu(*prop);
 466
 467         prop = fdt_getprop(blob, off, "hfront-porch", NULL);
 468         if (prop)
 469                 fb_mode->right_margin = fdt32_to_cpu(*prop);
 470
 471         prop = fdt_getprop(blob, off, "vback-porch", NULL);
 472         if (prop)
 473                 fb_mode->upper_margin = fdt32_to_cpu(*prop);
 474
 475         prop = fdt_getprop(blob, off, "vsync-len", NULL);
 476         if (prop)
 477                 fb_mode->vsync_len = fdt32_to_cpu(*prop);
 478
 479         prop = fdt_getprop(blob, off, "vfront-porch", NULL);
 480         if (prop)
 481                 fb_mode->lower_margin = fdt32_to_cpu(*prop);
 482
 483         prop = fdt_getprop(blob, off, "hsync-active", NULL);
 484         if (prop)
 485                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 486
 487         prop = fdt_getprop(blob, off, "vsync-active", NULL);
 488         if (prop)
 489                 fb_mode->sync |= *prop ? FB_SYNC_VERT_HIGH_ACT : 0;
 490
 491         prop = fdt_getprop(blob, off, "de-active", NULL);
 492         if (prop)
 493                 fb_mode->sync |= *prop ? 0 : FB_SYNC_OE_LOW_ACT;
 494
 495         prop = fdt_getprop(blob, off, "pixelclk-active", NULL);
 496         if (prop)
 497                 fb_mode->sync |= *prop ? 0 : FB_SYNC_CLK_LAT_FALL;
 498
 499         return 0;
 500 }
 501
 502 static int fdt_update_native_fb_mode(void *blob, int off)
 503 {
 504         int ret;
 505         uint32_t ph;
 506
 507         ret = fdt_increase_size(blob, 64);
 508         if (ret) {
 509                 printf("Warning: Failed to increase FDT size: %s\n",
 510                         fdt_strerror(ret));
 511         }
 512         debug("Creating phandle at offset %d\n", off);
 513         ph = fdt_create_phandle(blob, off);
 514         if (!ph) {
 515                 printf("Failed to create phandle for video timing\n");
 516                 return -ENOMEM;
 517         }
 518
 519         debug("phandle of %s @ %06x=%04x\n", fdt_get_name(blob, off, NULL),
 520                 off, ph);
 521         off = fdt_parent_offset(blob, off);
 522         if (off < 0)
 523                 return off;
 524         debug("parent offset=%06x\n", off);
 525         ret = fdt_setprop_cell(blob, off, "native-mode", ph);
 526         if (ret)
 527                 printf("Failed to set property 'native-mode': %s\n",
 528                         fdt_strerror(ret));
 529         karo_set_fdtsize(blob);
 530         return ret;
 531 }
 532
 533 static int karo_fdt_find_video_timings(void *blob)
 534 {
 535         int off = fdt_path_offset(blob, "display");
 536         const char *subnode = "display-timings";
 537
 538         if (off < 0) {
 539                 debug("Could not find node 'display' in FDT: %s\n",
 540                         fdt_strerror(off));
 541                 return off;
 542         }
 543
 544         off = fdt_subnode_offset(blob, off, subnode);
 545         if (off < 0) {
 546                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 547                         fdt_strerror(off));
 548         }
 549         return off;
 550 }
 551
 552 int karo_fdt_get_fb_mode(void *blob, const char *name, struct fb_videomode *fb_mode)
 553 {
 554         int off = karo_fdt_find_video_timings(blob);
 555
 556         if (off < 0)
 557                 return off;
 558         while (off > 0) {
 559                 const char *n, *endp;
 560                 int len, d = 1;
 561
 562                 off = fdt_next_node(blob, off, &d);
 563                 if (off < 0)
 564                         return off;
 565                 if (d < 1)
 566                         return -EINVAL;
 567                 if (d > 2) {
 568                         debug("Skipping node @ %04x %s depth %d\n", off,
 569                                 fdt_get_name(blob, off, NULL), d);
 570                         continue;
 571                 }
 572
 573                 n = fdt_getprop(blob, off, "panel-name", &len);
 574                 if (!n) {
 575                         n = fdt_get_name(blob, off, NULL);
 576                         if (strcasecmp(n, name) == 0) {
 577                                 break;
 578                         }
 579                 } else {
 580                         int found = 0;
 581
 582                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 583                                 debug("Checking panel-name '%s'\n", n);
 584                                 if (strcasecmp(n, name) == 0) {
 585                                         debug("Using node %s @ %04x\n",
 586                                                 fdt_get_name(blob, off, NULL), off);
 587                                         found = 1;
 588                                         break;
 589                                 }
 590                         }
 591                         if (found)
 592                                 break;
 593                 }
 594         }
 595         if (off > 0) {
 596                 return fdt_init_fb_mode(blob, off, fb_mode);
 597         }
 598         return -EINVAL;
 599 }
 600
 601 #define SET_FB_PROP(n, v) ({                                            \
 602         int ret;                                                        \
 603         ret = fdt_setprop_u32(blob, off, n, v);                         \
 604         if (ret) {                                                      \
 605                 printf("Failed to set property %s: %s\n", name,         \
 606                         fdt_strerror(ret));                             \
 607         }                                                               \
 608         ret;                                                            \
 609 })
 610
 611
 612 int karo_fdt_create_fb_mode(void *blob, const char *name,
 613                         struct fb_videomode *fb_mode)
 614 {
 615         int off = fdt_path_offset(blob, "display");
 616         int ret;
 617         const char *subnode = "display-timings";
 618
 619         if (off < 0) {
 620                 printf("'display' node not found in FDT\n");
 621                 return off;
 622         }
 623
 624         ret = fdt_increase_size(blob, 512);
 625         if (ret) {
 626                 printf("Failed to increase FDT size: %s\n", fdt_strerror(ret));
 627                 return ret;
 628         }
 629
 630         ret = fdt_subnode_offset(blob, off, subnode);
 631         if (ret < 0) {
 632                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 633                         fdt_strerror(ret));
 634                 ret = fdt_add_subnode(blob, off, subnode);
 635                 if (ret < 0) {
 636                         printf("Failed to add %s subnode: %s\n", subnode,
 637                                 fdt_strerror(ret));
 638                         return ret;
 639                 }
 640         }
 641
 642         ret = fdt_add_subnode(blob, ret, name);
 643         if (ret < 0) {
 644                 printf("Failed to add %s subnode: %s\n", name,
 645                         fdt_strerror(ret));
 646                 return ret;
 647         }
 648         off = ret;
 649
 650         ret = SET_FB_PROP("clock-frequency",
 651                         PICOS2KHZ(fb_mode->pixclock) * 1000);
 652         if (ret)
 653                 goto out;
 654         ret = SET_FB_PROP("hactive", fb_mode->xres);
 655         if (ret)
 656                 goto out;
 657         ret = SET_FB_PROP("vactive", fb_mode->yres);
 658         if (ret)
 659                 goto out;
 660         ret = SET_FB_PROP("hback-porch", fb_mode->left_margin);
 661         if (ret)
 662                 goto out;
 663         ret = SET_FB_PROP("hsync-len", fb_mode->hsync_len);
 664         if (ret)
 665                 goto out;
 666         ret = SET_FB_PROP("hfront-porch", fb_mode->right_margin);
 667         if (ret)
 668                 goto out;
 669         ret = SET_FB_PROP("vback-porch", fb_mode->upper_margin);
 670         if (ret)
 671                 goto out;
 672         ret = SET_FB_PROP("vsync-len", fb_mode->vsync_len);
 673         if (ret)
 674                 goto out;
 675         ret = SET_FB_PROP("vfront-porch", fb_mode->lower_margin);
 676         if (ret)
 677                 goto out;
 678         ret = SET_FB_PROP("hsync-active",
 679                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 680         if (ret)
 681                 goto out;
 682         ret = SET_FB_PROP("vsync-active",
 683                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 684         if (ret)
 685                 goto out;
 686         ret = SET_FB_PROP("de-active",
 687                         !(fb_mode->sync & FB_SYNC_OE_LOW_ACT));
 688         if (ret)
 689                 goto out;
 690         ret = SET_FB_PROP("pixelclk-active",
 691                         !(fb_mode->sync & FB_SYNC_CLK_LAT_FALL));
 692 out:
 693         karo_set_fdtsize(blob);
 694         return ret;
 695 }
 696
 697 int karo_fdt_update_fb_mode(void *blob, const char *name)
 698 {
 699         int off = fdt_path_offset(blob, "display");
 700         const char *subnode = "display-timings";
 701
 702         if (off < 0)
 703                 return off;
 704
 705         if (name == NULL) {
 706                 int ret;
 707
 708                 debug("Disabling node '%s' at %03x\n",
 709                         fdt_get_name(blob, off, NULL), off);
 710                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 711                 return ret;
 712         }
 713
 714         off = fdt_subnode_offset(blob, off, subnode);
 715         if (off < 0) {
 716                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 717                         fdt_strerror(off));
 718                 return off;
 719         }
 720         while (off > 0) {
 721                 const char *n, *endp;
 722                 int len, d = 1;
 723
 724                 off = fdt_next_node(blob, off, &d);
 725                 if (off < 0)
 726                         return off;
 727                 if (d < 1)
 728                         return -EINVAL;
 729                 if (d > 2) {
 730                         debug("Skipping node @ %04x %s depth %d\n", off,
 731                                 fdt_get_name(blob, off, NULL), d);
 732                         continue;
 733                 }
 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 #ifdef CONFIG_SYS_LVDS_IF
 763 int karo_fdt_get_lcd_bus_width(const void *blob, int default_width)
 764 {
 765         int off = fdt_path_offset(blob, "display");
 766
 767         if (off >= 0) {
 768                 const uint32_t *prop;
 769
 770                 prop = fdt_getprop(blob, off, "fsl,data-width", NULL);
 771                 if (prop)
 772                         return fdt32_to_cpu(*prop);
 773         }
 774         return default_width;
 775 }
 776
 777 int karo_fdt_get_lvds_mapping(const void *blob, int default_mapping)
 778 {
 779         int off = fdt_path_offset(blob, "display");
 780
 781         if (off >= 0) {
 782                 const char *prop;
 783
 784                 prop = fdt_getprop(blob, off, "fsl,data-mapping", NULL);
 785                 if (prop)
 786                         return strcmp(prop, "jeida") == 0;
 787         }
 788         return default_mapping;
 789 }
 790
 791 u8 karo_fdt_get_lvds_channels(const void *blob)
 792 {
 793         static const char *lvds_chans[] = {
 794                 "lvds0",
 795                 "lvds1",
 796         };
 797         u8 lvds_chan_mask = 0;
 798         int i;
 799
 800         for (i = 0; i < ARRAY_SIZE(lvds_chans); i++) {
 801                 const char *status;
 802                 int off = fdt_path_offset(blob, lvds_chans[i]);
 803
 804                 if (off < 0)
 805                         continue;
 806
 807                 status = fdt_getprop(blob, off, "status", NULL);
 808                 if (status && strcmp(status, "okay") == 0) {
 809                         debug("%s is enabled\n", lvds_chans[i]);
 810                         lvds_chan_mask |= 1 << i;
 811                 }
 812         }
 813         return lvds_chan_mask;
 814 }
 815 #endif
 816
 817 int karo_fdt_get_backlight_polarity(const void *blob)
 818 {
 819 #ifdef CONFIG_SYS_LVDS_IF
 820         const char *backlight_node = "/backlight0";
 821 #else
 822         const char *backlight_node = "/backlight";
 823 #endif
 824         int off = fdt_path_offset(blob, "backlight"); /* first try alias */
 825         const struct fdt_property *prop;
 826         int len;
 827
 828         if (off < 0) {
 829                 /*
 830                  * if no 'backlight' alias exists try finding '/backlight0'
 831                  * or '/backlight' depending on LVDS or not
 832                  */
 833                 off = fdt_path_offset(blob, backlight_node);
 834                 if (off < 0) {
 835                         printf("%s node not found in DT\n", backlight_node);
 836                         return off;
 837                 }
 838         }
 839
 840         prop = fdt_get_property(blob, off, "pwms", &len);
 841         if (!prop)
 842                 printf("'pwms' property not found\n");
 843         else
 844                 debug("'pwms' property has len %d\n", len);
 845
 846         len /= sizeof(u32);
 847         if (prop && len > 3) {
 848                 const u32 *data = (const u32 *)prop->data;
 849                 return fdt32_to_cpu(data[3]) == 0;
 850         }
 851         return 0;
 852 }