board/karo/common/fdt.c

   1 /*
   2  * (C) Copyright 2012,2013 Lothar Waßmann <LW@KARO-electronics.de>
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * version 2 as published by the Free Software Foundation.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16 */
  17
  18 #include <common.h>
  19 #include <errno.h>
  20 #include <libfdt.h>
  21 #include <fdt_support.h>
  22 #include <nand.h>
  23 #include <mxcfb.h>
  24 #include <linux/list.h>
  25 #include <linux/fb.h>
  26 #include <jffs2/load_kernel.h>
  27 #include <malloc.h>
  28
  29 #include "karo.h"
  30
  31 #ifdef CONFIG_MAX_DTB_SIZE
  32 #define MAX_DTB_SIZE    CONFIG_MAX_DTB_SIZE
  33 #else
  34 #define MAX_DTB_SIZE    SZ_64K
  35 #endif
  36
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 static void karo_set_fdtsize(void *fdt)
  40 {
  41         size_t fdtsize = getenv_ulong("fdtsize", 16, 0);
  42
  43         if (fdtsize == fdt_totalsize(fdt)) {
  44                 return;
  45         }
  46         debug("FDT size changed from %u to %u\n",
  47                 fdtsize, fdt_totalsize(fdt));
  48         setenv_hex("fdtsize", fdt_totalsize(fdt));
  49 }
  50
  51 static int karo_load_part(const char *part, void *addr, size_t len)
  52 {
  53         int ret;
  54         struct mtd_device *dev;
  55         struct part_info *part_info;
  56         u8 part_num;
  57         size_t actual;
  58
  59         debug("Initializing mtd_parts\n");
  60         ret = mtdparts_init();
  61         if (ret)
  62                 return ret;
  63
  64         debug("Trying to find NAND partition '%s'\n", part);
  65         ret = find_dev_and_part(part, &dev, &part_num, &part_info);
  66         if (ret) {
  67                 printf("Failed to find flash partition '%s': %d\n",
  68                         part, ret);
  69
  70                 return ret;
  71         }
  72         debug("Found partition '%s': offset=%08x size=%08x\n",
  73                 part, part_info->offset, part_info->size);
  74         if (part_info->size < len) {
  75                 printf("Warning: partition '%s' smaller than requested size: %u; truncating data to %u byte\n",
  76                         part, len, part_info->size);
  77                 len = part_info->size;
  78         }
  79         debug("Reading NAND partition '%s' to %p\n", part, addr);
  80         ret = nand_read_skip_bad(&nand_info[0], part_info->offset, &len,
  81                                 &actual, len, addr);
  82         if (ret) {
  83                 printf("Failed to load partition '%s' to %p\n", part, addr);
  84                 return ret;
  85         }
  86         if (actual < len)
  87                 printf("Read only %u of %u bytes due to bad blocks\n",
  88                         actual, len);
  89
  90         debug("Read %u byte from partition '%s' @ offset %08x\n",
  91                 len, part, part_info->offset);
  92         return 0;
  93 }
  94
  95 static void *karo_fdt_load_dtb(void)
  96 {
  97         int ret;
  98         void *fdt = (void *)getenv_ulong("fdtaddr", 16, CONFIG_SYS_FDT_ADDR);
  99
 100         if (had_ctrlc()) {
 101                 printf("aborting DTB load\n");
 102                 return NULL;
 103         }
 104
 105         /* clear FDT header in memory */
 106         memset(fdt, 0, 4);
 107
 108         ret = karo_load_part("dtb", fdt, MAX_DTB_SIZE);
 109         if (ret) {
 110                 printf("Failed to load dtb from flash: %d\n", ret);
 111                 return NULL;
 112         }
 113
 114         if (fdt_check_header(fdt)) {
 115                 debug("No valid DTB in flash\n");
 116                 return NULL;
 117         }
 118         debug("Using DTB from flash\n");
 119         karo_set_fdtsize(fdt);
 120         return fdt;
 121 }
 122
 123 void karo_fdt_move_fdt(void)
 124 {
 125         void *fdt;
 126         unsigned long fdt_addr = getenv_ulong("fdtaddr", 16, 0);
 127
 128         if (working_fdt) {
 129                 debug("DTB already loaded\n");
 130                 return;
 131         }
 132
 133         setenv("fdtsize", 0);
 134
 135         if (!fdt_addr) {
 136                 fdt_addr = CONFIG_SYS_FDT_ADDR;
 137                 printf("fdtaddr is not set; using default: %08lx\n",
 138                         fdt_addr);
 139         }
 140
 141         fdt = karo_fdt_load_dtb();
 142         if (fdt == NULL) {
 143                 fdt = (void *)gd->fdt_blob;
 144                 if (fdt == NULL) {
 145 #ifdef CONFIG_OF_EMBED
 146                         printf("Compiled in FDT not found");
 147 #else
 148                         printf("No FDT found");
 149 #endif
 150                         printf("; creating empty DTB\n");
 151                         fdt = (void *)fdt_addr;
 152                         fdt_create_empty_tree(fdt, 256);
 153                 } else {
 154                         printf("No DTB in flash; using default DTB\n");
 155                 }
 156                 debug("Checking FDT header @ %p\n", fdt);
 157                 if (fdt_check_header(fdt)) {
 158                         printf("ERROR: No valid DTB found at %p\n", fdt);
 159                         return;
 160                 }
 161                 debug("Moving FDT from %p..%p to %08lx..%08lx\n",
 162                         fdt, fdt + fdt_totalsize(fdt) - 1,
 163                         fdt_addr, fdt_addr + fdt_totalsize(fdt) - 1);
 164                 memmove((void *)fdt_addr, fdt, fdt_totalsize(fdt));
 165         }
 166         set_working_fdt_addr((void *)fdt_addr);
 167         gd->fdt_blob = fdt;
 168         karo_set_fdtsize(fdt);
 169 }
 170
 171 void karo_fdt_remove_node(void *blob, const char *node)
 172 {
 173         int off = fdt_path_offset(blob, node);
 174         int ret;
 175
 176         debug("Removing node '%s' from DT\n", node);
 177
 178         if (off < 0) {
 179                 printf("Could not find node '%s': %s\n", node,
 180                         fdt_strerror(off));
 181         } else {
 182                 ret = fdt_del_node(blob, off);
 183                 if (ret)
 184                         printf("Failed to remove node '%s': %s\n",
 185                                 node, fdt_strerror(ret));
 186         }
 187         karo_set_fdtsize(blob);
 188 }
 189
 190 void karo_fdt_enable_node(void *blob, const char *node, int enable)
 191 {
 192         int off = fdt_path_offset(blob, node);
 193
 194         debug("%sabling node '%s'\n", enable ? "En" : "Dis", node);
 195         if (off < 0) {
 196                 printf("Could not find node '%s': %s\n", node,
 197                         fdt_strerror(off));
 198                 return;
 199         }
 200         fdt_set_node_status(blob, off,
 201                         enable ? FDT_STATUS_OKAY : FDT_STATUS_DISABLED, 0);
 202
 203         karo_set_fdtsize(blob);
 204 }
 205
 206 static void fdt_disable_tp_node(void *blob, const char *name)
 207 {
 208         int offs = fdt_node_offset_by_compatible(blob, -1, name);
 209
 210         while (offs >= 0) {
 211                 debug("Disabling node '%s'\n", name);
 212                 fdt_set_node_status(blob, offs, FDT_STATUS_DISABLED, 0);
 213                 offs = fdt_node_offset_by_compatible(blob, offs, name);
 214         }
 215 }
 216
 217 void karo_fdt_fixup_touchpanel(void *blob, const char *panels[],
 218                         size_t num_panels)
 219 {
 220         int i;
 221         const char *model = getenv("touchpanel");
 222
 223         for (i = 0; i < num_panels; i++) {
 224                 const char *tp = panels[i];
 225
 226                 if (model != NULL) {
 227                         if (strcmp(model, tp) == 0)
 228                                 continue;
 229                         while (tp != NULL) {
 230                                 if (*tp != '\0' && strcmp(model, tp + 1) == 0)
 231                                         break;
 232                                 tp = strpbrk(tp + 1, ",-");
 233                         }
 234                         if (tp != NULL)
 235                                 continue;
 236                 }
 237                 fdt_disable_tp_node(blob, panels[i]);
 238         }
 239         karo_set_fdtsize(blob);
 240 }
 241
 242 static int karo_fdt_disable_node_phandle(void *blob, const char *parent,
 243                                         const char *name)
 244 {
 245         const uint32_t *ph;
 246         int off;
 247
 248         off = fdt_path_offset(blob, parent);
 249         if (off < 0) {
 250                 printf("Failed to find node '%s'\n", parent);
 251                 return off;
 252         }
 253
 254         ph = fdt_getprop(blob, off, name, NULL);
 255         if (ph == NULL) {
 256                 printf("Failed to find '%s' phandle in node '%s'\n", name,
 257                         fdt_get_name(blob, off, NULL));
 258                 return -FDT_ERR_NOTFOUND;
 259         }
 260
 261         off = fdt_node_offset_by_phandle(blob, fdt32_to_cpu(*ph));
 262         if (off <= 0) {
 263                 printf("Failed to find '%s' node via phandle %04x\n",
 264                         name, fdt32_to_cpu(*ph));
 265                 return -FDT_ERR_NOTFOUND;
 266         }
 267         return fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 268 }
 269
 270 void karo_fdt_fixup_usb_otg(void *blob, const char *node, const char *phy)
 271 {
 272         const char *otg_mode = getenv("otg_mode");
 273         int off;
 274         int ret;
 275         int disable_otg = 0;
 276         int disable_phy_pins = 1;
 277
 278         debug("OTG mode is '%s'\n", otg_mode ? otg_mode : "<UNSET>");
 279
 280         off = fdt_path_offset(blob, node);
 281         if (off < 0) {
 282                 debug("Failed to find node %s\n", node);
 283                 return;
 284         }
 285
 286         if (otg_mode && (strcmp(otg_mode, "device") == 0 ||
 287                                 strcmp(otg_mode, "gadget") == 0)) {
 288                 debug("Setting dr_mode to 'peripheral'\n");
 289                 ret = fdt_setprop_string(blob, off, "dr_mode", "peripheral");
 290         } else if (otg_mode && strcmp(otg_mode, "host") == 0) {
 291                 debug("Setting dr_mode to 'host'\n");
 292                 ret = fdt_setprop_string(blob, off, "dr_mode", "host");
 293                 disable_phy_pins = 0;
 294         } else if (otg_mode && strcmp(otg_mode, "otg") == 0) {
 295                 debug("Setting dr_mode to 'host'\n");
 296                 ret = fdt_setprop_string(blob, off, "dr_mode", "otg");
 297         } else {
 298                 if (otg_mode && strcmp(otg_mode, "none") != 0)
 299                         printf("Invalid 'otg_mode' setting '%s'; disabling usbotg port\n",
 300                                 otg_mode);
 301                 disable_otg = 1;
 302                 ret = 0;
 303         }
 304
 305         if ((!disable_phy_pins && !disable_otg) || ret)
 306                 goto out;
 307
 308         ret = karo_fdt_disable_node_phandle(blob, node, "vbus-supply");
 309         if (ret)
 310                 goto out;
 311
 312         if (disable_otg) {
 313                 debug("Disabling usbphy\n");
 314                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 315                 if (ret)
 316                         goto out;
 317
 318                 ret = karo_fdt_disable_node_phandle(blob, node, phy);
 319         }
 320 out:
 321         if (ret)
 322                 printf("Failed to update usbotg: %s\n", fdt_strerror(ret));
 323         else
 324                 debug("node '%s' updated\n", node);
 325         karo_set_fdtsize(blob);
 326 }
 327
 328 static inline int karo_fdt_flexcan_enabled(void *blob)
 329 {
 330         static const char *can_ifs[] = {
 331                 "can0",
 332                 "can1",
 333         };
 334         size_t i;
 335
 336         for (i = 0; i < ARRAY_SIZE(can_ifs); i++) {
 337                 const char *status;
 338                 int off = fdt_path_offset(blob, can_ifs[i]);
 339
 340                 if (off < 0) {
 341                         debug("node '%s' not found\n", can_ifs[i]);
 342                         continue;
 343                 }
 344                 status = fdt_getprop(blob, off, "status", NULL);
 345                 if (status && strcmp(status, "okay") == 0) {
 346                         debug("%s is enabled\n", can_ifs[i]);
 347                         return 1;
 348                 }
 349         }
 350         debug("can driver is disabled\n");
 351         return 0;
 352 }
 353
 354 static inline void karo_fdt_set_lcd_pins(void *blob, const char *name)
 355 {
 356         int off = fdt_path_offset(blob, name);
 357         u32 ph;
 358         const struct fdt_property *pc;
 359         int len;
 360
 361         if (off < 0)
 362                 return;
 363
 364         ph = fdt_create_phandle(blob, off);
 365         if (!ph)
 366                 return;
 367
 368         off = fdt_path_offset(blob, "display");
 369         if (off < 0)
 370                 return;
 371
 372         pc = fdt_get_property(blob, off, "pinctrl-0", &len);
 373         if (!pc || len < sizeof(ph))
 374                 return;
 375
 376         memcpy((void *)pc->data, &ph, sizeof(ph));
 377         fdt_setprop_cell(blob, off, "pinctrl-0", ph);
 378 }
 379
 380 void karo_fdt_fixup_flexcan(void *blob, int xcvr_present)
 381 {
 382         int ret;
 383         const char *xcvr_status = xcvr_present ? "disabled" : NULL;
 384         const char *otg_mode = getenv("otg_mode");
 385
 386 #ifndef CONFIG_SYS_LVDS_IF
 387         if (xcvr_present) {
 388                 if (karo_fdt_flexcan_enabled(blob)) {
 389                         karo_fdt_set_lcd_pins(blob, "lcdif_23bit_pins_a");
 390                         xcvr_status = NULL;
 391                 } else {
 392                         karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 393                 }
 394         } else {
 395                 karo_fdt_set_lcd_pins(blob, "lcdif_24bit_pins_a");
 396         }
 397 #endif
 398         if (otg_mode && strcmp(otg_mode, "host") == 0)
 399                 karo_fdt_enable_node(blob, "can1", 0);
 400
 401         if (xcvr_status) {
 402                 debug("Disabling CAN XCVR\n");
 403                 ret = fdt_find_and_setprop(blob, "reg_can_xcvr", "status",
 404                                         xcvr_status, strlen(xcvr_status) + 1, 1);
 405                 if (ret)
 406                         printf("Failed to disable CAN transceiver switch: %s\n",
 407                                 fdt_strerror(ret));
 408         }
 409 }
 410
 411 void karo_fdt_del_prop(void *blob, const char *compat, phys_addr_t offs,
 412                         const char *prop)
 413 {
 414         int ret;
 415         int offset;
 416         const uint32_t *phandle;
 417         uint32_t ph = 0;
 418
 419         offset = fdt_node_offset_by_compat_reg(blob, compat, offs);
 420         if (offset <= 0)
 421                 return;
 422
 423         phandle = fdt_getprop(blob, offset, prop, NULL);
 424         if (phandle) {
 425                 ph = fdt32_to_cpu(*phandle);
 426         }
 427
 428         debug("Removing property '%s' from node %s@%08lx\n", prop, compat, offs);
 429         ret = fdt_delprop(blob, offset, prop);
 430         if (ret == 0)
 431                 karo_set_fdtsize(blob);
 432
 433         if (!ph)
 434                 return;
 435
 436         offset = fdt_node_offset_by_phandle(blob, ph);
 437         if (offset <= 0)
 438                 return;
 439
 440         debug("Removing node @ %08x\n", offset);
 441         fdt_del_node(blob, offset);
 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 int karo_fdt_get_fb_mode(void *blob, const char *name, struct fb_videomode *fb_mode)
 557 {
 558         int off = karo_fdt_find_video_timings(blob);
 559
 560         if (off < 0)
 561                 return off;
 562         while (off > 0) {
 563                 const char *n, *endp;
 564                 int len, d = 1;
 565
 566                 off = fdt_next_node(blob, off, &d);
 567                 if (off < 0)
 568                         return off;
 569                 if (d < 1)
 570                         return -EINVAL;
 571                 if (d > 2) {
 572                         debug("Skipping node @ %04x %s depth %d\n", off,
 573                                 fdt_get_name(blob, off, NULL), d);
 574                         continue;
 575                 }
 576                 debug("parsing subnode @ %04x %s depth %d\n", off,
 577                         fdt_get_name(blob, off, NULL), d);
 578
 579                 n = fdt_getprop(blob, off, "panel-name", &len);
 580                 if (!n) {
 581                         n = fdt_get_name(blob, off, NULL);
 582                         if (strcasecmp(n, name) == 0) {
 583                                 break;
 584                         }
 585                 } else {
 586                         int found = 0;
 587
 588                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 589                                 debug("Checking panel-name '%s'\n", n);
 590                                 if (strcasecmp(n, name) == 0) {
 591                                         debug("Using node %s @ %04x\n",
 592                                                 fdt_get_name(blob, off, NULL), off);
 593                                         found = 1;
 594                                         break;
 595                                 }
 596                         }
 597                         if (found)
 598                                 break;
 599                 }
 600         }
 601         if (off > 0) {
 602                 return fdt_init_fb_mode(blob, off, fb_mode);
 603         }
 604         return -EINVAL;
 605 }
 606
 607 #define SET_FB_PROP(n, v) ({                                            \
 608         int ret;                                                        \
 609         ret = fdt_setprop_u32(blob, off, n, v);                         \
 610         if (ret) {                                                      \
 611                 printf("Failed to set property %s: %s\n", name,         \
 612                         fdt_strerror(ret));                             \
 613         }                                                               \
 614         ret;                                                            \
 615 })
 616
 617
 618 int karo_fdt_create_fb_mode(void *blob, const char *name,
 619                         struct fb_videomode *fb_mode)
 620 {
 621         int off = fdt_path_offset(blob, "display");
 622         int ret;
 623         const char *subnode = "display-timings";
 624
 625         if (off < 0) {
 626                 printf("'display' node not found in FDT\n");
 627                 return off;
 628         }
 629
 630         ret = fdt_increase_size(blob, 512);
 631         if (ret) {
 632                 printf("Failed to increase FDT size: %s\n", fdt_strerror(ret));
 633                 return ret;
 634         }
 635
 636         ret = fdt_subnode_offset(blob, off, subnode);
 637         if (ret < 0) {
 638                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 639                         fdt_strerror(ret));
 640                 ret = fdt_add_subnode(blob, off, subnode);
 641                 if (ret < 0) {
 642                         printf("Failed to add %s subnode: %s\n", subnode,
 643                                 fdt_strerror(ret));
 644                         return ret;
 645                 }
 646         }
 647
 648         ret = fdt_add_subnode(blob, ret, name);
 649         if (ret < 0) {
 650                 printf("Failed to add %s subnode: %s\n", name,
 651                         fdt_strerror(ret));
 652                 return ret;
 653         }
 654         off = ret;
 655
 656         ret = SET_FB_PROP("clock-frequency",
 657                         PICOS2KHZ(fb_mode->pixclock) * 1000);
 658         if (ret)
 659                 goto out;
 660         ret = SET_FB_PROP("hactive", fb_mode->xres);
 661         if (ret)
 662                 goto out;
 663         ret = SET_FB_PROP("vactive", fb_mode->yres);
 664         if (ret)
 665                 goto out;
 666         ret = SET_FB_PROP("hback-porch", fb_mode->left_margin);
 667         if (ret)
 668                 goto out;
 669         ret = SET_FB_PROP("hsync-len", fb_mode->hsync_len);
 670         if (ret)
 671                 goto out;
 672         ret = SET_FB_PROP("hfront-porch", fb_mode->right_margin);
 673         if (ret)
 674                 goto out;
 675         ret = SET_FB_PROP("vback-porch", fb_mode->upper_margin);
 676         if (ret)
 677                 goto out;
 678         ret = SET_FB_PROP("vsync-len", fb_mode->vsync_len);
 679         if (ret)
 680                 goto out;
 681         ret = SET_FB_PROP("vfront-porch", fb_mode->lower_margin);
 682         if (ret)
 683                 goto out;
 684         ret = SET_FB_PROP("hsync-active",
 685                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 686         if (ret)
 687                 goto out;
 688         ret = SET_FB_PROP("vsync-active",
 689                         fb_mode->sync & FB_SYNC_VERT_HIGH_ACT ? 1 : 0);
 690         if (ret)
 691                 goto out;
 692         ret = SET_FB_PROP("de-active",
 693                         !(fb_mode->sync & FB_SYNC_OE_LOW_ACT));
 694         if (ret)
 695                 goto out;
 696         ret = SET_FB_PROP("pixelclk-active",
 697                         !(fb_mode->sync & FB_SYNC_CLK_LAT_FALL));
 698 out:
 699         karo_set_fdtsize(blob);
 700         return ret;
 701 }
 702
 703 int karo_fdt_update_fb_mode(void *blob, const char *name)
 704 {
 705         int off = fdt_path_offset(blob, "display");
 706         const char *subnode = "display-timings";
 707
 708         if (off < 0)
 709                 return off;
 710
 711         if (name == NULL) {
 712                 int ret;
 713
 714                 debug("Disabling node '%s' at %03x\n",
 715                         fdt_get_name(blob, off, NULL), off);
 716                 ret = fdt_set_node_status(blob, off, FDT_STATUS_DISABLED, 0);
 717                 return ret;
 718         }
 719
 720         off = fdt_subnode_offset(blob, off, subnode);
 721         if (off < 0) {
 722                 debug("Could not find node '%s' in FDT: %s\n", subnode,
 723                         fdt_strerror(off));
 724                 return off;
 725         }
 726         while (off > 0) {
 727                 const char *n, *endp;
 728                 int len, d = 1;
 729
 730                 off = fdt_next_node(blob, off, &d);
 731                 if (off < 0)
 732                         return off;
 733                 if (d < 1)
 734                         return -EINVAL;
 735                 if (d > 2) {
 736                         debug("Skipping node @ %04x %s depth %d\n", off,
 737                                 fdt_get_name(blob, off, NULL), d);
 738                         continue;
 739                 }
 740                 debug("parsing subnode @ %04x %s depth %d\n", off,
 741                         fdt_get_name(blob, off, NULL), d);
 742
 743                 n = fdt_getprop(blob, off, "panel-name", &len);
 744                 if (!n) {
 745                         n = fdt_get_name(blob, off, NULL);
 746                         if (strcasecmp(n, name) == 0) {
 747                                 break;
 748                         }
 749                 } else {
 750                         int found = 0;
 751
 752                         for (endp = n + len; n < endp; n += strlen(n) + 1) {
 753                                 debug("Checking panel-name '%s'\n", n);
 754                                 if (strcasecmp(n, name) == 0) {
 755                                         debug("Using node %s @ %04x\n",
 756                                                 fdt_get_name(blob, off, NULL), off);
 757                                         found = 1;
 758                                         break;
 759                                 }
 760                         }
 761                         if (found)
 762                                 break;
 763                 }
 764         }
 765         if (off > 0)
 766                 return fdt_update_native_fb_mode(blob, off);
 767         return off;
 768 }
 769
 770 int karo_fdt_get_lcd_bus_width(const void *blob, int default_width)
 771 {
 772         int off = fdt_path_offset(blob, "display");
 773
 774         if (off >= 0) {
 775                 const uint32_t *prop;
 776
 777                 prop = fdt_getprop(blob, off, "fsl,data-width", NULL);
 778                 if (prop)
 779                         return fdt32_to_cpu(*prop);
 780         }
 781         return default_width;
 782 }
 783
 784 int karo_fdt_get_lvds_mapping(const void *blob, int default_mapping)
 785 {
 786         int off = fdt_path_offset(blob, "display");
 787
 788         if (off >= 0) {
 789                 const char *prop;
 790
 791                 prop = fdt_getprop(blob, off, "fsl,data-mapping", NULL);
 792                 if (prop)
 793                         return strcmp(prop, "jeida") == 0;
 794         }
 795         return default_mapping;
 796 }
 797
 798 u8 karo_fdt_get_lvds_channels(const void *blob)
 799 {
 800         static const char *lvds_chans[] = {
 801                 "lvds0",
 802                 "lvds1",
 803         };
 804         u8 lvds_chan_mask = 0;
 805         int i;
 806
 807         for (i = 0; i < ARRAY_SIZE(lvds_chans); i++) {
 808                 const char *status;
 809                 int off = fdt_path_offset(blob, lvds_chans[i]);
 810
 811                 if (off < 0)
 812                         continue;
 813
 814                 status = fdt_getprop(blob, off, "status", NULL);
 815                 if (status && strcmp(status, "okay") == 0) {
 816                         debug("%s is enabled\n", lvds_chans[i]);
 817                         lvds_chan_mask |= 1 << i;
 818                 }
 819         }
 820         return lvds_chan_mask;
 821 }
 822
 823 int karo_fdt_get_backlight_polarity(const void *blob)
 824 {
 825         int off = fdt_path_offset(blob, "/backlight");
 826         const struct fdt_property *prop;
 827         int len;
 828
 829         if (off < 0) {
 830                 printf("/backlight node not found in DT\n");
 831                 return off;
 832         }
 833
 834         prop = fdt_get_property(blob, off, "pwms", &len);
 835         if (!prop)
 836                 printf("'pwms' property not found\n");
 837         else
 838                 debug("'pwms' property has len %d\n", len);
 839
 840         len /= sizeof(u32);
 841         if (prop && len > 3) {
 842                 const u32 *data = (const u32 *)prop->data;
 843                 return fdt32_to_cpu(data[3]) == 0;
 844         }
 845         return 0;
 846 }