common/console.c

   1 /*
   2  * (C) Copyright 2000
   3  * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7
   8 #include <common.h>
   9 #include <console.h>
  10 #include <debug_uart.h>
  11 #include <dm.h>
  12 #include <stdarg.h>
  13 #include <iomux.h>
  14 #include <malloc.h>
  15 #include <mapmem.h>
  16 #include <os.h>
  17 #include <serial.h>
  18 #include <stdio_dev.h>
  19 #include <exports.h>
  20 #include <environment.h>
  21 #include <watchdog.h>
  22
  23 DECLARE_GLOBAL_DATA_PTR;
  24
  25 static int on_console(const char *name, const char *value, enum env_op op,
  26         int flags)
  27 {
  28         int console = -1;
  29
  30         /* Check for console redirection */
  31         if (strcmp(name, "stdin") == 0)
  32                 console = stdin;
  33         else if (strcmp(name, "stdout") == 0)
  34                 console = stdout;
  35         else if (strcmp(name, "stderr") == 0)
  36                 console = stderr;
  37
  38         /* if not actually setting a console variable, we don't care */
  39         if (console == -1 || (gd->flags & GD_FLG_DEVINIT) == 0)
  40                 return 0;
  41
  42         switch (op) {
  43         case env_op_create:
  44         case env_op_overwrite:
  45
  46 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
  47                 if (iomux_doenv(console, value))
  48                         return 1;
  49 #else
  50                 /* Try assigning specified device */
  51                 if (console_assign(console, value) < 0)
  52                         return 1;
  53 #endif
  54                 return 0;
  55
  56         case env_op_delete:
  57                 if ((flags & H_FORCE) == 0)
  58                         printf("Can't delete \"%s\"\n", name);
  59                 return 1;
  60
  61         default:
  62                 return 0;
  63         }
  64 }
  65 U_BOOT_ENV_CALLBACK(console, on_console);
  66
  67 #ifdef CONFIG_SILENT_CONSOLE
  68 static int on_silent(const char *name, const char *value, enum env_op op,
  69         int flags)
  70 {
  71 #if !CONFIG_IS_ENABLED(SILENT_CONSOLE_UPDATE_ON_SET)
  72         if (flags & H_INTERACTIVE)
  73                 return 0;
  74 #endif
  75 #if !CONFIG_IS_ENABLED(SILENT_CONSOLE_UPDATE_ON_RELOC)
  76         if ((flags & H_INTERACTIVE) == 0)
  77                 return 0;
  78 #endif
  79
  80         if (value != NULL)
  81                 gd->flags |= GD_FLG_SILENT;
  82         else
  83                 gd->flags &= ~GD_FLG_SILENT;
  84
  85         return 0;
  86 }
  87 U_BOOT_ENV_CALLBACK(silent, on_silent);
  88 #endif
  89
  90 #if CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV)
  91 /*
  92  * if overwrite_console returns 1, the stdin, stderr and stdout
  93  * are switched to the serial port, else the settings in the
  94  * environment are used
  95  */
  96 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
  97 extern int overwrite_console(void);
  98 #define OVERWRITE_CONSOLE overwrite_console()
  99 #else
 100 #define OVERWRITE_CONSOLE 0
 101 #endif /* CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE */
 102
 103 #endif /* CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV) */
 104
 105 static int console_setfile(int file, struct stdio_dev * dev)
 106 {
 107         int error = 0;
 108
 109         if (dev == NULL)
 110                 return -1;
 111
 112         switch (file) {
 113         case stdin:
 114         case stdout:
 115         case stderr:
 116                 /* Start new device */
 117                 if (dev->start) {
 118                         error = dev->start(dev);
 119                         /* If it's not started dont use it */
 120                         if (error < 0)
 121                                 break;
 122                 }
 123
 124                 /* Assign the new device (leaving the existing one started) */
 125                 stdio_devices[file] = dev;
 126
 127                 /*
 128                  * Update monitor functions
 129                  * (to use the console stuff by other applications)
 130                  */
 131                 switch (file) {
 132                 case stdin:
 133                         gd->jt->getc = getc;
 134                         gd->jt->tstc = tstc;
 135                         break;
 136                 case stdout:
 137                         gd->jt->putc  = putc;
 138                         gd->jt->puts  = puts;
 139                         gd->jt->printf = printf;
 140                         break;
 141                 }
 142                 break;
 143
 144         default:                /* Invalid file ID */
 145                 error = -1;
 146         }
 147         return error;
 148 }
 149
 150 /**
 151  * console_dev_is_serial() - Check if a stdio device is a serial device
 152  *
 153  * @sdev: Device to check
 154  * @return true if this device is in the serial uclass (or for pre-driver-model,
 155  * whether it is called "serial".
 156  */
 157 static bool console_dev_is_serial(struct stdio_dev *sdev)
 158 {
 159         bool is_serial;
 160
 161 #ifdef CONFIG_DM_SERIAL
 162         if (sdev->flags & DEV_FLAGS_DM) {
 163                 struct udevice *dev = sdev->priv;
 164
 165                 is_serial = device_get_uclass_id(dev) == UCLASS_SERIAL;
 166         } else
 167 #endif
 168         is_serial = !strcmp(sdev->name, "serial");
 169
 170         return is_serial;
 171 }
 172
 173 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 174 /** Console I/O multiplexing *******************************************/
 175
 176 static struct stdio_dev *tstcdev;
 177 struct stdio_dev **console_devices[MAX_FILES];
 178 int cd_count[MAX_FILES];
 179
 180 /*
 181  * This depends on tstc() always being called before getc().
 182  * This is guaranteed to be true because this routine is called
 183  * only from fgetc() which assures it.
 184  * No attempt is made to demultiplex multiple input sources.
 185  */
 186 static int console_getc(int file)
 187 {
 188         unsigned char ret;
 189
 190         /* This is never called with testcdev == NULL */
 191         ret = tstcdev->getc(tstcdev);
 192         tstcdev = NULL;
 193         return ret;
 194 }
 195
 196 static int console_tstc(int file)
 197 {
 198         int i, ret;
 199         struct stdio_dev *dev;
 200
 201         disable_ctrlc(1);
 202         for (i = 0; i < cd_count[file]; i++) {
 203                 dev = console_devices[file][i];
 204                 if (dev->tstc != NULL) {
 205                         ret = dev->tstc(dev);
 206                         if (ret > 0) {
 207                                 tstcdev = dev;
 208                                 disable_ctrlc(0);
 209                                 return ret;
 210                         }
 211                 }
 212         }
 213         disable_ctrlc(0);
 214
 215         return 0;
 216 }
 217
 218 static void console_putc(int file, const char c)
 219 {
 220         int i;
 221         struct stdio_dev *dev;
 222
 223         for (i = 0; i < cd_count[file]; i++) {
 224                 dev = console_devices[file][i];
 225                 if (dev->putc != NULL)
 226                         dev->putc(dev, c);
 227         }
 228 }
 229
 230 static void console_puts_noserial(int file, const char *s)
 231 {
 232         int i;
 233         struct stdio_dev *dev;
 234
 235         for (i = 0; i < cd_count[file]; i++) {
 236                 dev = console_devices[file][i];
 237                 if (dev->puts != NULL && !console_dev_is_serial(dev))
 238                         dev->puts(dev, s);
 239         }
 240 }
 241
 242 static void console_puts(int file, const char *s)
 243 {
 244         int i;
 245         struct stdio_dev *dev;
 246
 247         for (i = 0; i < cd_count[file]; i++) {
 248                 dev = console_devices[file][i];
 249                 if (dev->puts != NULL)
 250                         dev->puts(dev, s);
 251         }
 252 }
 253
 254 static inline void console_doenv(int file, struct stdio_dev *dev)
 255 {
 256         iomux_doenv(file, dev->name);
 257 }
 258 #else
 259 static inline int console_getc(int file)
 260 {
 261         return stdio_devices[file]->getc(stdio_devices[file]);
 262 }
 263
 264 static inline int console_tstc(int file)
 265 {
 266         return stdio_devices[file]->tstc(stdio_devices[file]);
 267 }
 268
 269 static inline void console_putc(int file, const char c)
 270 {
 271         stdio_devices[file]->putc(stdio_devices[file], c);
 272 }
 273
 274 static inline void console_puts_noserial(int file, const char *s)
 275 {
 276         if (!console_dev_is_serial(stdio_devices[file]))
 277                 stdio_devices[file]->puts(stdio_devices[file], s);
 278 }
 279
 280 static inline void console_puts(int file, const char *s)
 281 {
 282         stdio_devices[file]->puts(stdio_devices[file], s);
 283 }
 284
 285 static inline void console_doenv(int file, struct stdio_dev *dev)
 286 {
 287         console_setfile(file, dev);
 288 }
 289 #endif /* CONIFIG_IS_ENABLED(CONSOLE_MUX) */
 290
 291 /** U-Boot INITIAL CONSOLE-NOT COMPATIBLE FUNCTIONS *************************/
 292
 293 int serial_printf(const char *fmt, ...)
 294 {
 295         va_list args;
 296         uint i;
 297         char printbuffer[CONFIG_SYS_PBSIZE];
 298
 299         va_start(args, fmt);
 300
 301         /* For this to work, printbuffer must be larger than
 302          * anything we ever want to print.
 303          */
 304         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 305         va_end(args);
 306
 307         serial_puts(printbuffer);
 308         return i;
 309 }
 310
 311 int fgetc(int file)
 312 {
 313         if (file < MAX_FILES) {
 314 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 315                 /*
 316                  * Effectively poll for input wherever it may be available.
 317                  */
 318                 for (;;) {
 319                         WATCHDOG_RESET();
 320                         /*
 321                          * Upper layer may have already called tstc() so
 322                          * check for that first.
 323                          */
 324                         if (tstcdev != NULL)
 325                                 return console_getc(file);
 326                         console_tstc(file);
 327 #ifdef CONFIG_WATCHDOG
 328                         /*
 329                          * If the watchdog must be rate-limited then it should
 330                          * already be handled in board-specific code.
 331                          */
 332                          udelay(1);
 333 #endif
 334                 }
 335 #else
 336                 return console_getc(file);
 337 #endif
 338         }
 339
 340         return -1;
 341 }
 342
 343 int ftstc(int file)
 344 {
 345         if (file < MAX_FILES)
 346                 return console_tstc(file);
 347
 348         return -1;
 349 }
 350
 351 void fputc(int file, const char c)
 352 {
 353         if (file < MAX_FILES)
 354                 console_putc(file, c);
 355 }
 356
 357 void fputs(int file, const char *s)
 358 {
 359         if (file < MAX_FILES)
 360                 console_puts(file, s);
 361 }
 362
 363 int fprintf(int file, const char *fmt, ...)
 364 {
 365         va_list args;
 366         uint i;
 367         char printbuffer[CONFIG_SYS_PBSIZE];
 368
 369         va_start(args, fmt);
 370
 371         /* For this to work, printbuffer must be larger than
 372          * anything we ever want to print.
 373          */
 374         i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 375         va_end(args);
 376
 377         /* Send to desired file */
 378         fputs(file, printbuffer);
 379         return i;
 380 }
 381
 382 /** U-Boot INITIAL CONSOLE-COMPATIBLE FUNCTION *****************************/
 383
 384 int getc(void)
 385 {
 386 #ifdef CONFIG_DISABLE_CONSOLE
 387         if (gd->flags & GD_FLG_DISABLE_CONSOLE)
 388                 return 0;
 389 #endif
 390
 391         if (!gd->have_console)
 392                 return 0;
 393
 394 #ifdef CONFIG_CONSOLE_RECORD
 395         if (gd->console_in.start) {
 396                 int ch;
 397
 398                 ch = membuff_getbyte(&gd->console_in);
 399                 if (ch != -1)
 400                         return 1;
 401         }
 402 #endif
 403         if (gd->flags & GD_FLG_DEVINIT) {
 404                 /* Get from the standard input */
 405                 return fgetc(stdin);
 406         }
 407
 408         /* Send directly to the handler */
 409         return serial_getc();
 410 }
 411
 412 int tstc(void)
 413 {
 414 #ifdef CONFIG_DISABLE_CONSOLE
 415         if (gd->flags & GD_FLG_DISABLE_CONSOLE)
 416                 return 0;
 417 #endif
 418
 419         if (!gd->have_console)
 420                 return 0;
 421 #ifdef CONFIG_CONSOLE_RECORD
 422         if (gd->console_in.start) {
 423                 if (membuff_peekbyte(&gd->console_in) != -1)
 424                         return 1;
 425         }
 426 #endif
 427         if (gd->flags & GD_FLG_DEVINIT) {
 428                 /* Test the standard input */
 429                 return ftstc(stdin);
 430         }
 431
 432         /* Send directly to the handler */
 433         return serial_tstc();
 434 }
 435
 436 #define PRE_CONSOLE_FLUSHPOINT1_SERIAL                  0
 437 #define PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL   1
 438
 439 #if CONFIG_IS_ENABLED(PRE_CONSOLE_BUFFER)
 440 #define CIRC_BUF_IDX(idx) ((idx) % (unsigned long)CONFIG_PRE_CON_BUF_SZ)
 441
 442 static void pre_console_putc(const char c)
 443 {
 444         char *buffer;
 445
 446         buffer = map_sysmem(CONFIG_PRE_CON_BUF_ADDR, CONFIG_PRE_CON_BUF_SZ);
 447
 448         buffer[CIRC_BUF_IDX(gd->precon_buf_idx++)] = c;
 449
 450         unmap_sysmem(buffer);
 451 }
 452
 453 static void pre_console_puts(const char *s)
 454 {
 455         while (*s)
 456                 pre_console_putc(*s++);
 457 }
 458
 459 static void print_pre_console_buffer(int flushpoint)
 460 {
 461         unsigned long in = 0, out = 0;
 462         char buf_out[CONFIG_PRE_CON_BUF_SZ + 1];
 463         char *buf_in;
 464
 465         buf_in = map_sysmem(CONFIG_PRE_CON_BUF_ADDR, CONFIG_PRE_CON_BUF_SZ);
 466         if (gd->precon_buf_idx > CONFIG_PRE_CON_BUF_SZ)
 467                 in = gd->precon_buf_idx - CONFIG_PRE_CON_BUF_SZ;
 468
 469         while (in < gd->precon_buf_idx)
 470                 buf_out[out++] = buf_in[CIRC_BUF_IDX(in++)];
 471         unmap_sysmem(buf_in);
 472
 473         buf_out[out] = 0;
 474
 475         switch (flushpoint) {
 476         case PRE_CONSOLE_FLUSHPOINT1_SERIAL:
 477                 puts(buf_out);
 478                 break;
 479         case PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL:
 480                 console_puts_noserial(stdout, buf_out);
 481                 break;
 482         }
 483 }
 484 #else
 485 static inline void pre_console_putc(const char c) {}
 486 static inline void pre_console_puts(const char *s) {}
 487 static inline void print_pre_console_buffer(int flushpoint) {}
 488 #endif
 489
 490 void putc(const char c)
 491 {
 492 #ifdef CONFIG_SANDBOX
 493         /* sandbox can send characters to stdout before it has a console */
 494         if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
 495                 os_putc(c);
 496                 return;
 497         }
 498 #endif
 499 #ifdef CONFIG_DEBUG_UART
 500         /* if we don't have a console yet, use the debug UART */
 501         if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
 502                 printch(c);
 503                 return;
 504         }
 505 #endif
 506 #ifdef CONFIG_CONSOLE_RECORD
 507         if (gd && (gd->flags & GD_FLG_RECORD) && gd->console_out.start)
 508                 membuff_putbyte(&gd->console_out, c);
 509 #endif
 510 #ifdef CONFIG_SILENT_CONSOLE
 511         if (gd->flags & GD_FLG_SILENT)
 512                 return;
 513 #endif
 514
 515 #ifdef CONFIG_DISABLE_CONSOLE
 516         if (gd->flags & GD_FLG_DISABLE_CONSOLE)
 517                 return;
 518 #endif
 519
 520         if (!gd->have_console)
 521                 return pre_console_putc(c);
 522
 523         if (gd->flags & GD_FLG_DEVINIT) {
 524                 /* Send to the standard output */
 525                 fputc(stdout, c);
 526         } else {
 527                 /* Send directly to the handler */
 528                 pre_console_putc(c);
 529                 serial_putc(c);
 530         }
 531 }
 532
 533 void puts(const char *s)
 534 {
 535 #ifdef CONFIG_DEBUG_UART
 536         if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
 537                 while (*s) {
 538                         int ch = *s++;
 539
 540                         printch(ch);
 541                 }
 542                 return;
 543         }
 544 #endif
 545 #ifdef CONFIG_CONSOLE_RECORD
 546         if (gd && (gd->flags & GD_FLG_RECORD) && gd->console_out.start)
 547                 membuff_put(&gd->console_out, s, strlen(s));
 548 #endif
 549 #ifdef CONFIG_SILENT_CONSOLE
 550         if (gd->flags & GD_FLG_SILENT)
 551                 return;
 552 #endif
 553
 554 #ifdef CONFIG_DISABLE_CONSOLE
 555         if (gd->flags & GD_FLG_DISABLE_CONSOLE)
 556                 return;
 557 #endif
 558
 559         if (!gd->have_console)
 560                 return pre_console_puts(s);
 561
 562         if (gd->flags & GD_FLG_DEVINIT) {
 563                 /* Send to the standard output */
 564                 fputs(stdout, s);
 565         } else {
 566                 /* Send directly to the handler */
 567                 pre_console_puts(s);
 568                 serial_puts(s);
 569         }
 570 }
 571
 572 #ifdef CONFIG_CONSOLE_RECORD
 573 int console_record_init(void)
 574 {
 575         int ret;
 576
 577         ret = membuff_new(&gd->console_out, CONFIG_CONSOLE_RECORD_OUT_SIZE);
 578         if (ret)
 579                 return ret;
 580         ret = membuff_new(&gd->console_in, CONFIG_CONSOLE_RECORD_IN_SIZE);
 581
 582         return ret;
 583 }
 584
 585 void console_record_reset(void)
 586 {
 587         membuff_purge(&gd->console_out);
 588         membuff_purge(&gd->console_in);
 589 }
 590
 591 void console_record_reset_enable(void)
 592 {
 593         console_record_reset();
 594         gd->flags |= GD_FLG_RECORD;
 595 }
 596 #endif
 597
 598 /* test if ctrl-c was pressed */
 599 static int ctrlc_disabled = 0;  /* see disable_ctrl() */
 600 static int ctrlc_was_pressed = 0;
 601 int ctrlc(void)
 602 {
 603 #ifndef CONFIG_SANDBOX
 604         if (!ctrlc_disabled && gd->have_console) {
 605                 if (tstc()) {
 606                         switch (getc()) {
 607                         case 0x03:              /* ^C - Control C */
 608                                 ctrlc_was_pressed = 1;
 609                                 return 1;
 610                         default:
 611                                 break;
 612                         }
 613                 }
 614         }
 615 #endif
 616
 617         return 0;
 618 }
 619 /* Reads user's confirmation.
 620    Returns 1 if user's input is "y", "Y", "yes" or "YES"
 621 */
 622 int confirm_yesno(void)
 623 {
 624         int i;
 625         char str_input[5];
 626
 627         /* Flush input */
 628         while (tstc())
 629                 getc();
 630         i = 0;
 631         while (i < sizeof(str_input)) {
 632                 str_input[i] = getc();
 633                 putc(str_input[i]);
 634                 if (str_input[i] == '\r')
 635                         break;
 636                 i++;
 637         }
 638         putc('\n');
 639         if (strncmp(str_input, "y\r", 2) == 0 ||
 640             strncmp(str_input, "Y\r", 2) == 0 ||
 641             strncmp(str_input, "yes\r", 4) == 0 ||
 642             strncmp(str_input, "YES\r", 4) == 0)
 643                 return 1;
 644         return 0;
 645 }
 646 /* pass 1 to disable ctrlc() checking, 0 to enable.
 647  * returns previous state
 648  */
 649 int disable_ctrlc(int disable)
 650 {
 651         int prev = ctrlc_disabled;      /* save previous state */
 652
 653         ctrlc_disabled = disable;
 654         return prev;
 655 }
 656
 657 int had_ctrlc (void)
 658 {
 659         return ctrlc_was_pressed;
 660 }
 661
 662 void clear_ctrlc(void)
 663 {
 664         ctrlc_was_pressed = 0;
 665 }
 666
 667 /** U-Boot INIT FUNCTIONS *************************************************/
 668
 669 struct stdio_dev *search_device(int flags, const char *name)
 670 {
 671         struct stdio_dev *dev;
 672
 673         dev = stdio_get_by_name(name);
 674 #ifdef CONFIG_VIDCONSOLE_AS_LCD
 675         if (!dev && !strcmp(name, "lcd"))
 676                 dev = stdio_get_by_name("vidconsole");
 677 #endif
 678
 679         if (dev && (dev->flags & flags))
 680                 return dev;
 681
 682         return NULL;
 683 }
 684
 685 int console_assign(int file, const char *devname)
 686 {
 687         int flag;
 688         struct stdio_dev *dev;
 689
 690         /* Check for valid file */
 691         switch (file) {
 692         case stdin:
 693                 flag = DEV_FLAGS_INPUT;
 694                 break;
 695         case stdout:
 696         case stderr:
 697                 flag = DEV_FLAGS_OUTPUT;
 698                 break;
 699         default:
 700                 return -1;
 701         }
 702
 703         /* Check for valid device name */
 704
 705         dev = search_device(flag, devname);
 706
 707         if (dev)
 708                 return console_setfile(file, dev);
 709
 710         return -1;
 711 }
 712
 713 static void console_update_silent(void)
 714 {
 715 #ifdef CONFIG_SILENT_CONSOLE
 716         if (env_get("silent") != NULL)
 717                 gd->flags |= GD_FLG_SILENT;
 718         else
 719                 gd->flags &= ~GD_FLG_SILENT;
 720 #endif
 721 }
 722
 723 int console_announce_r(void)
 724 {
 725 #if !CONFIG_IS_ENABLED(PRE_CONSOLE_BUFFER)
 726         char buf[DISPLAY_OPTIONS_BANNER_LENGTH];
 727
 728         display_options_get_banner(false, buf, sizeof(buf));
 729
 730         console_puts_noserial(stdout, buf);
 731 #endif
 732
 733         return 0;
 734 }
 735
 736 /* Called before relocation - use serial functions */
 737 int console_init_f(void)
 738 {
 739         gd->have_console = 1;
 740
 741         console_update_silent();
 742
 743         print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT1_SERIAL);
 744
 745         return 0;
 746 }
 747
 748 void stdio_print_current_devices(void)
 749 {
 750         /* Print information */
 751         puts("In:    ");
 752         if (stdio_devices[stdin] == NULL) {
 753                 puts("No input devices available!\n");
 754         } else {
 755                 printf ("%s\n", stdio_devices[stdin]->name);
 756         }
 757
 758         puts("Out:   ");
 759         if (stdio_devices[stdout] == NULL) {
 760                 puts("No output devices available!\n");
 761         } else {
 762                 printf ("%s\n", stdio_devices[stdout]->name);
 763         }
 764
 765         puts("Err:   ");
 766         if (stdio_devices[stderr] == NULL) {
 767                 puts("No error devices available!\n");
 768         } else {
 769                 printf ("%s\n", stdio_devices[stderr]->name);
 770         }
 771 }
 772
 773 #if CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV)
 774 /* Called after the relocation - use desired console functions */
 775 int console_init_r(void)
 776 {
 777         char *stdinname, *stdoutname, *stderrname;
 778         struct stdio_dev *inputdev = NULL, *outputdev = NULL, *errdev = NULL;
 779 #ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
 780         int i;
 781 #endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */
 782 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 783         int iomux_err = 0;
 784 #endif
 785
 786         /* set default handlers at first */
 787         gd->jt->getc  = serial_getc;
 788         gd->jt->tstc  = serial_tstc;
 789         gd->jt->putc  = serial_putc;
 790         gd->jt->puts  = serial_puts;
 791         gd->jt->printf = serial_printf;
 792
 793         /* stdin stdout and stderr are in environment */
 794         /* scan for it */
 795         stdinname  = env_get("stdin");
 796         stdoutname = env_get("stdout");
 797         stderrname = env_get("stderr");
 798
 799         if (OVERWRITE_CONSOLE == 0) {   /* if not overwritten by config switch */
 800                 inputdev  = search_device(DEV_FLAGS_INPUT,  stdinname);
 801                 outputdev = search_device(DEV_FLAGS_OUTPUT, stdoutname);
 802                 errdev    = search_device(DEV_FLAGS_OUTPUT, stderrname);
 803 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 804                 iomux_err = iomux_doenv(stdin, stdinname);
 805                 iomux_err += iomux_doenv(stdout, stdoutname);
 806                 iomux_err += iomux_doenv(stderr, stderrname);
 807                 if (!iomux_err)
 808                         /* Successful, so skip all the code below. */
 809                         goto done;
 810 #endif
 811         }
 812         /* if the devices are overwritten or not found, use default device */
 813         if (inputdev == NULL) {
 814                 inputdev  = search_device(DEV_FLAGS_INPUT,  "serial");
 815         }
 816         if (outputdev == NULL) {
 817                 outputdev = search_device(DEV_FLAGS_OUTPUT, "serial");
 818         }
 819         if (errdev == NULL) {
 820                 errdev    = search_device(DEV_FLAGS_OUTPUT, "serial");
 821         }
 822         /* Initializes output console first */
 823         if (outputdev != NULL) {
 824                 /* need to set a console if not done above. */
 825                 console_doenv(stdout, outputdev);
 826         }
 827         if (errdev != NULL) {
 828                 /* need to set a console if not done above. */
 829                 console_doenv(stderr, errdev);
 830         }
 831         if (inputdev != NULL) {
 832                 /* need to set a console if not done above. */
 833                 console_doenv(stdin, inputdev);
 834         }
 835
 836 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 837 done:
 838 #endif
 839
 840 #ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
 841         stdio_print_current_devices();
 842 #endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */
 843 #ifdef CONFIG_VIDCONSOLE_AS_LCD
 844         if (strstr(stdoutname, "lcd"))
 845                 printf("Warning: Please change 'lcd' to 'vidconsole' in stdout/stderr environment vars\n");
 846 #endif
 847
 848 #ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
 849         /* set the environment variables (will overwrite previous env settings) */
 850         for (i = 0; i < 3; i++) {
 851                 env_set(stdio_names[i], stdio_devices[i]->name);
 852         }
 853 #endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */
 854
 855         gd->flags |= GD_FLG_DEVINIT;    /* device initialization completed */
 856
 857 #if 0
 858         /* If nothing usable installed, use only the initial console */
 859         if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
 860                 return 0;
 861 #endif
 862         print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL);
 863         return 0;
 864 }
 865
 866 #else /* !CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV) */
 867
 868 /* Called after the relocation - use desired console functions */
 869 int console_init_r(void)
 870 {
 871         struct stdio_dev *inputdev = NULL, *outputdev = NULL;
 872         int i;
 873         struct list_head *list = stdio_get_list();
 874         struct list_head *pos;
 875         struct stdio_dev *dev;
 876
 877         console_update_silent();
 878
 879 #ifdef CONFIG_SPLASH_SCREEN
 880         /*
 881          * suppress all output if splash screen is enabled and we have
 882          * a bmp to display. We redirect the output from frame buffer
 883          * console to serial console in this case or suppress it if
 884          * "silent" mode was requested.
 885          */
 886         if (env_get("splashimage") != NULL) {
 887                 if (!(gd->flags & GD_FLG_SILENT))
 888                         outputdev = search_device (DEV_FLAGS_OUTPUT, "serial");
 889         }
 890 #endif
 891
 892         /* Scan devices looking for input and output devices */
 893         list_for_each(pos, list) {
 894                 dev = list_entry(pos, struct stdio_dev, list);
 895
 896                 if ((dev->flags & DEV_FLAGS_INPUT) && (inputdev == NULL)) {
 897                         inputdev = dev;
 898                 }
 899                 if ((dev->flags & DEV_FLAGS_OUTPUT) && (outputdev == NULL)) {
 900                         outputdev = dev;
 901                 }
 902                 if(inputdev && outputdev)
 903                         break;
 904         }
 905
 906         /* Initializes output console first */
 907         if (outputdev != NULL) {
 908                 console_setfile(stdout, outputdev);
 909                 console_setfile(stderr, outputdev);
 910 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 911                 console_devices[stdout][0] = outputdev;
 912                 console_devices[stderr][0] = outputdev;
 913 #endif
 914         }
 915
 916         /* Initializes input console */
 917         if (inputdev != NULL) {
 918                 console_setfile(stdin, inputdev);
 919 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 920                 console_devices[stdin][0] = inputdev;
 921 #endif
 922         }
 923
 924 #ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
 925         stdio_print_current_devices();
 926 #endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */
 927
 928         /* Setting environment variables */
 929         for (i = 0; i < 3; i++) {
 930                 env_set(stdio_names[i], stdio_devices[i]->name);
 931         }
 932
 933         gd->flags |= GD_FLG_DEVINIT;    /* device initialization completed */
 934
 935 #if 0
 936         /* If nothing usable installed, use only the initial console */
 937         if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
 938                 return 0;
 939 #endif
 940         print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL);
 941         return 0;
 942 }
 943
 944 #endif /* CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV) */