common/console.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2000
   4  * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
   5  */
   6
   7 #include <common.h>
   8 #include <console.h>
   9 #include <debug_uart.h>
  10 #include <dm.h>
  11 #include <stdarg.h>
  12 #include <iomux.h>
  13 #include <malloc.h>
  14 #include <mapmem.h>
  15 #include <os.h>
  16 #include <serial.h>
  17 #include <stdio_dev.h>
  18 #include <exports.h>
  19 #include <environment.h>
  20 #include <watchdog.h>
  21
  22 DECLARE_GLOBAL_DATA_PTR;
  23
  24 static int on_console(const char *name, const char *value, enum env_op op,
  25         int flags)
  26 {
  27         int console = -1;
  28
  29         /* Check for console redirection */
  30         if (strcmp(name, "stdin") == 0)
  31                 console = stdin;
  32         else if (strcmp(name, "stdout") == 0)
  33                 console = stdout;
  34         else if (strcmp(name, "stderr") == 0)
  35                 console = stderr;
  36
  37         /* if not actually setting a console variable, we don't care */
  38         if (console == -1 || (gd->flags & GD_FLG_DEVINIT) == 0)
  39                 return 0;
  40
  41         switch (op) {
  42         case env_op_create:
  43         case env_op_overwrite:
  44
  45 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
  46                 if (iomux_doenv(console, value))
  47                         return 1;
  48 #else
  49                 /* Try assigning specified device */
  50                 if (console_assign(console, value) < 0)
  51                         return 1;
  52 #endif
  53                 return 0;
  54
  55         case env_op_delete:
  56                 if ((flags & H_FORCE) == 0)
  57                         printf("Can't delete \"%s\"\n", name);
  58                 return 1;
  59
  60         default:
  61                 return 0;
  62         }
  63 }
  64 U_BOOT_ENV_CALLBACK(console, on_console);
  65
  66 #ifdef CONFIG_SILENT_CONSOLE
  67 static int on_silent(const char *name, const char *value, enum env_op op,
  68         int flags)
  69 {
  70 #if !CONFIG_IS_ENABLED(SILENT_CONSOLE_UPDATE_ON_SET)
  71         if (flags & H_INTERACTIVE)
  72                 return 0;
  73 #endif
  74 #if !CONFIG_IS_ENABLED(SILENT_CONSOLE_UPDATE_ON_RELOC)
  75         if ((flags & H_INTERACTIVE) == 0)
  76                 return 0;
  77 #endif
  78
  79         if (value != NULL)
  80                 gd->flags |= GD_FLG_SILENT;
  81         else
  82                 gd->flags &= ~GD_FLG_SILENT;
  83
  84         return 0;
  85 }
  86 U_BOOT_ENV_CALLBACK(silent, on_silent);
  87 #endif
  88
  89 #if CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV)
  90 /*
  91  * if overwrite_console returns 1, the stdin, stderr and stdout
  92  * are switched to the serial port, else the settings in the
  93  * environment are used
  94  */
  95 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
  96 extern int overwrite_console(void);
  97 #define OVERWRITE_CONSOLE overwrite_console()
  98 #else
  99 #define OVERWRITE_CONSOLE 0
 100 #endif /* CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE */
 101
 102 #endif /* CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV) */
 103
 104 static int console_setfile(int file, struct stdio_dev * dev)
 105 {
 106         int error = 0;
 107
 108         if (dev == NULL)
 109                 return -1;
 110
 111         switch (file) {
 112         case stdin:
 113         case stdout:
 114         case stderr:
 115                 /* Start new device */
 116                 if (dev->start) {
 117                         error = dev->start(dev);
 118                         /* If it's not started dont use it */
 119                         if (error < 0)
 120                                 break;
 121                 }
 122
 123                 /* Assign the new device (leaving the existing one started) */
 124                 stdio_devices[file] = dev;
 125
 126                 /*
 127                  * Update monitor functions
 128                  * (to use the console stuff by other applications)
 129                  */
 130                 switch (file) {
 131                 case stdin:
 132                         gd->jt->getc = getc;
 133                         gd->jt->tstc = tstc;
 134                         break;
 135                 case stdout:
 136                         gd->jt->putc  = putc;
 137                         gd->jt->puts  = puts;
 138                         gd->jt->printf = printf;
 139                         break;
 140                 }
 141                 break;
 142
 143         default:                /* Invalid file ID */
 144                 error = -1;
 145         }
 146         return error;
 147 }
 148
 149 /**
 150  * console_dev_is_serial() - Check if a stdio device is a serial device
 151  *
 152  * @sdev: Device to check
 153  * @return true if this device is in the serial uclass (or for pre-driver-model,
 154  * whether it is called "serial".
 155  */
 156 static bool console_dev_is_serial(struct stdio_dev *sdev)
 157 {
 158         bool is_serial;
 159
 160 #ifdef CONFIG_DM_SERIAL
 161         if (sdev->flags & DEV_FLAGS_DM) {
 162                 struct udevice *dev = sdev->priv;
 163
 164                 is_serial = device_get_uclass_id(dev) == UCLASS_SERIAL;
 165         } else
 166 #endif
 167         is_serial = !strcmp(sdev->name, "serial");
 168
 169         return is_serial;
 170 }
 171
 172 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 173 /** Console I/O multiplexing *******************************************/
 174
 175 static struct stdio_dev *tstcdev;
 176 struct stdio_dev **console_devices[MAX_FILES];
 177 int cd_count[MAX_FILES];
 178
 179 /*
 180  * This depends on tstc() always being called before getc().
 181  * This is guaranteed to be true because this routine is called
 182  * only from fgetc() which assures it.
 183  * No attempt is made to demultiplex multiple input sources.
 184  */
 185 static int console_getc(int file)
 186 {
 187         unsigned char ret;
 188
 189         /* This is never called with testcdev == NULL */
 190         ret = tstcdev->getc(tstcdev);
 191         tstcdev = NULL;
 192         return ret;
 193 }
 194
 195 static int console_tstc(int file)
 196 {
 197         int i, ret;
 198         struct stdio_dev *dev;
 199         int prev;
 200
 201         prev = 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(prev);
 209                                 return ret;
 210                         }
 211                 }
 212         }
 213         disable_ctrlc(prev);
 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         if (!gd)
 507                 return;
 508 #ifdef CONFIG_CONSOLE_RECORD
 509         if ((gd->flags & GD_FLG_RECORD) && gd->console_out.start)
 510                 membuff_putbyte(&gd->console_out, c);
 511 #endif
 512 #ifdef CONFIG_SILENT_CONSOLE
 513         if (gd->flags & GD_FLG_SILENT)
 514                 return;
 515 #endif
 516
 517 #ifdef CONFIG_DISABLE_CONSOLE
 518         if (gd->flags & GD_FLG_DISABLE_CONSOLE)
 519                 return;
 520 #endif
 521
 522         if (!gd->have_console)
 523                 return pre_console_putc(c);
 524
 525         if (gd->flags & GD_FLG_DEVINIT) {
 526                 /* Send to the standard output */
 527                 fputc(stdout, c);
 528         } else {
 529                 /* Send directly to the handler */
 530                 pre_console_putc(c);
 531                 serial_putc(c);
 532         }
 533 }
 534
 535 void puts(const char *s)
 536 {
 537 #ifdef CONFIG_DEBUG_UART
 538         if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) {
 539                 while (*s) {
 540                         int ch = *s++;
 541
 542                         printch(ch);
 543                 }
 544                 return;
 545         }
 546 #endif
 547         if (!gd)
 548                 return;
 549 #ifdef CONFIG_CONSOLE_RECORD
 550         if ((gd->flags & GD_FLG_RECORD) && gd->console_out.start)
 551                 membuff_put(&gd->console_out, s, strlen(s));
 552 #endif
 553 #ifdef CONFIG_SILENT_CONSOLE
 554         if (gd->flags & GD_FLG_SILENT)
 555                 return;
 556 #endif
 557
 558 #ifdef CONFIG_DISABLE_CONSOLE
 559         if (gd->flags & GD_FLG_DISABLE_CONSOLE)
 560                 return;
 561 #endif
 562
 563         if (!gd->have_console)
 564                 return pre_console_puts(s);
 565
 566         if (gd->flags & GD_FLG_DEVINIT) {
 567                 /* Send to the standard output */
 568                 fputs(stdout, s);
 569         } else {
 570                 /* Send directly to the handler */
 571                 pre_console_puts(s);
 572                 serial_puts(s);
 573         }
 574 }
 575
 576 #ifdef CONFIG_CONSOLE_RECORD
 577 int console_record_init(void)
 578 {
 579         int ret;
 580
 581         ret = membuff_new(&gd->console_out, CONFIG_CONSOLE_RECORD_OUT_SIZE);
 582         if (ret)
 583                 return ret;
 584         ret = membuff_new(&gd->console_in, CONFIG_CONSOLE_RECORD_IN_SIZE);
 585
 586         return ret;
 587 }
 588
 589 void console_record_reset(void)
 590 {
 591         membuff_purge(&gd->console_out);
 592         membuff_purge(&gd->console_in);
 593 }
 594
 595 void console_record_reset_enable(void)
 596 {
 597         console_record_reset();
 598         gd->flags |= GD_FLG_RECORD;
 599 }
 600 #endif
 601
 602 /* test if ctrl-c was pressed */
 603 static int ctrlc_disabled = 0;  /* see disable_ctrl() */
 604 static int ctrlc_was_pressed = 0;
 605 int ctrlc(void)
 606 {
 607         if (!ctrlc_disabled && gd->have_console) {
 608                 if (tstc()) {
 609                         switch (getc()) {
 610                         case 0x03:              /* ^C - Control C */
 611                                 ctrlc_was_pressed = 1;
 612                                 return 1;
 613                         default:
 614                                 break;
 615                         }
 616                 }
 617         }
 618
 619         return 0;
 620 }
 621 /* Reads user's confirmation.
 622    Returns 1 if user's input is "y", "Y", "yes" or "YES"
 623 */
 624 int confirm_yesno(void)
 625 {
 626         int i;
 627         char str_input[5];
 628
 629         /* Flush input */
 630         while (tstc())
 631                 getc();
 632         i = 0;
 633         while (i < sizeof(str_input)) {
 634                 str_input[i] = getc();
 635                 putc(str_input[i]);
 636                 if (str_input[i] == '\r')
 637                         break;
 638                 i++;
 639         }
 640         putc('\n');
 641         if (strncmp(str_input, "y\r", 2) == 0 ||
 642             strncmp(str_input, "Y\r", 2) == 0 ||
 643             strncmp(str_input, "yes\r", 4) == 0 ||
 644             strncmp(str_input, "YES\r", 4) == 0)
 645                 return 1;
 646         return 0;
 647 }
 648 /* pass 1 to disable ctrlc() checking, 0 to enable.
 649  * returns previous state
 650  */
 651 int disable_ctrlc(int disable)
 652 {
 653         int prev = ctrlc_disabled;      /* save previous state */
 654
 655         ctrlc_disabled = disable;
 656         return prev;
 657 }
 658
 659 int had_ctrlc (void)
 660 {
 661         return ctrlc_was_pressed;
 662 }
 663
 664 void clear_ctrlc(void)
 665 {
 666         ctrlc_was_pressed = 0;
 667 }
 668
 669 /** U-Boot INIT FUNCTIONS *************************************************/
 670
 671 struct stdio_dev *search_device(int flags, const char *name)
 672 {
 673         struct stdio_dev *dev;
 674
 675         dev = stdio_get_by_name(name);
 676 #ifdef CONFIG_VIDCONSOLE_AS_LCD
 677         if (!dev && !strcmp(name, "lcd"))
 678                 dev = stdio_get_by_name("vidconsole");
 679 #endif
 680
 681         if (dev && (dev->flags & flags))
 682                 return dev;
 683
 684         return NULL;
 685 }
 686
 687 int console_assign(int file, const char *devname)
 688 {
 689         int flag;
 690         struct stdio_dev *dev;
 691
 692         /* Check for valid file */
 693         switch (file) {
 694         case stdin:
 695                 flag = DEV_FLAGS_INPUT;
 696                 break;
 697         case stdout:
 698         case stderr:
 699                 flag = DEV_FLAGS_OUTPUT;
 700                 break;
 701         default:
 702                 return -1;
 703         }
 704
 705         /* Check for valid device name */
 706
 707         dev = search_device(flag, devname);
 708
 709         if (dev)
 710                 return console_setfile(file, dev);
 711
 712         return -1;
 713 }
 714
 715 static void console_update_silent(void)
 716 {
 717 #ifdef CONFIG_SILENT_CONSOLE
 718         if (env_get("silent") != NULL)
 719                 gd->flags |= GD_FLG_SILENT;
 720         else
 721                 gd->flags &= ~GD_FLG_SILENT;
 722 #endif
 723 }
 724
 725 int console_announce_r(void)
 726 {
 727 #if !CONFIG_IS_ENABLED(PRE_CONSOLE_BUFFER)
 728         char buf[DISPLAY_OPTIONS_BANNER_LENGTH];
 729
 730         display_options_get_banner(false, buf, sizeof(buf));
 731
 732         console_puts_noserial(stdout, buf);
 733 #endif
 734
 735         return 0;
 736 }
 737
 738 /* Called before relocation - use serial functions */
 739 int console_init_f(void)
 740 {
 741         gd->have_console = 1;
 742
 743         console_update_silent();
 744
 745         print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT1_SERIAL);
 746
 747         return 0;
 748 }
 749
 750 void stdio_print_current_devices(void)
 751 {
 752         /* Print information */
 753         puts("In:    ");
 754         if (stdio_devices[stdin] == NULL) {
 755                 puts("No input devices available!\n");
 756         } else {
 757                 printf ("%s\n", stdio_devices[stdin]->name);
 758         }
 759
 760         puts("Out:   ");
 761         if (stdio_devices[stdout] == NULL) {
 762                 puts("No output devices available!\n");
 763         } else {
 764                 printf ("%s\n", stdio_devices[stdout]->name);
 765         }
 766
 767         puts("Err:   ");
 768         if (stdio_devices[stderr] == NULL) {
 769                 puts("No error devices available!\n");
 770         } else {
 771                 printf ("%s\n", stdio_devices[stderr]->name);
 772         }
 773 }
 774
 775 #if CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV)
 776 /* Called after the relocation - use desired console functions */
 777 int console_init_r(void)
 778 {
 779         char *stdinname, *stdoutname, *stderrname;
 780         struct stdio_dev *inputdev = NULL, *outputdev = NULL, *errdev = NULL;
 781 #ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
 782         int i;
 783 #endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */
 784 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 785         int iomux_err = 0;
 786 #endif
 787
 788         /* set default handlers at first */
 789         gd->jt->getc  = serial_getc;
 790         gd->jt->tstc  = serial_tstc;
 791         gd->jt->putc  = serial_putc;
 792         gd->jt->puts  = serial_puts;
 793         gd->jt->printf = serial_printf;
 794
 795         /* stdin stdout and stderr are in environment */
 796         /* scan for it */
 797         stdinname  = env_get("stdin");
 798         stdoutname = env_get("stdout");
 799         stderrname = env_get("stderr");
 800
 801         if (OVERWRITE_CONSOLE == 0) {   /* if not overwritten by config switch */
 802                 inputdev  = search_device(DEV_FLAGS_INPUT,  stdinname);
 803                 outputdev = search_device(DEV_FLAGS_OUTPUT, stdoutname);
 804                 errdev    = search_device(DEV_FLAGS_OUTPUT, stderrname);
 805 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 806                 iomux_err = iomux_doenv(stdin, stdinname);
 807                 iomux_err += iomux_doenv(stdout, stdoutname);
 808                 iomux_err += iomux_doenv(stderr, stderrname);
 809                 if (!iomux_err)
 810                         /* Successful, so skip all the code below. */
 811                         goto done;
 812 #endif
 813         }
 814         /* if the devices are overwritten or not found, use default device */
 815         if (inputdev == NULL) {
 816                 inputdev  = search_device(DEV_FLAGS_INPUT,  "serial");
 817         }
 818         if (outputdev == NULL) {
 819                 outputdev = search_device(DEV_FLAGS_OUTPUT, "serial");
 820         }
 821         if (errdev == NULL) {
 822                 errdev    = search_device(DEV_FLAGS_OUTPUT, "serial");
 823         }
 824         /* Initializes output console first */
 825         if (outputdev != NULL) {
 826                 /* need to set a console if not done above. */
 827                 console_doenv(stdout, outputdev);
 828         }
 829         if (errdev != NULL) {
 830                 /* need to set a console if not done above. */
 831                 console_doenv(stderr, errdev);
 832         }
 833         if (inputdev != NULL) {
 834                 /* need to set a console if not done above. */
 835                 console_doenv(stdin, inputdev);
 836         }
 837
 838 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 839 done:
 840 #endif
 841
 842 #ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
 843         stdio_print_current_devices();
 844 #endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */
 845 #ifdef CONFIG_VIDCONSOLE_AS_LCD
 846         if (strstr(stdoutname, "lcd"))
 847                 printf("Warning: Please change 'lcd' to 'vidconsole' in stdout/stderr environment vars\n");
 848 #endif
 849
 850 #ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
 851         /* set the environment variables (will overwrite previous env settings) */
 852         for (i = 0; i < MAX_FILES; i++) {
 853                 env_set(stdio_names[i], stdio_devices[i]->name);
 854         }
 855 #endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */
 856
 857         gd->flags |= GD_FLG_DEVINIT;    /* device initialization completed */
 858
 859 #if 0
 860         /* If nothing usable installed, use only the initial console */
 861         if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
 862                 return 0;
 863 #endif
 864         print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL);
 865         return 0;
 866 }
 867
 868 #else /* !CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV) */
 869
 870 /* Called after the relocation - use desired console functions */
 871 int console_init_r(void)
 872 {
 873         struct stdio_dev *inputdev = NULL, *outputdev = NULL;
 874         int i;
 875         struct list_head *list = stdio_get_list();
 876         struct list_head *pos;
 877         struct stdio_dev *dev;
 878
 879         console_update_silent();
 880
 881 #ifdef CONFIG_SPLASH_SCREEN
 882         /*
 883          * suppress all output if splash screen is enabled and we have
 884          * a bmp to display. We redirect the output from frame buffer
 885          * console to serial console in this case or suppress it if
 886          * "silent" mode was requested.
 887          */
 888         if (env_get("splashimage") != NULL) {
 889                 if (!(gd->flags & GD_FLG_SILENT))
 890                         outputdev = search_device (DEV_FLAGS_OUTPUT, "serial");
 891         }
 892 #endif
 893
 894         /* Scan devices looking for input and output devices */
 895         list_for_each(pos, list) {
 896                 dev = list_entry(pos, struct stdio_dev, list);
 897
 898                 if ((dev->flags & DEV_FLAGS_INPUT) && (inputdev == NULL)) {
 899                         inputdev = dev;
 900                 }
 901                 if ((dev->flags & DEV_FLAGS_OUTPUT) && (outputdev == NULL)) {
 902                         outputdev = dev;
 903                 }
 904                 if(inputdev && outputdev)
 905                         break;
 906         }
 907
 908         /* Initializes output console first */
 909         if (outputdev != NULL) {
 910                 console_setfile(stdout, outputdev);
 911                 console_setfile(stderr, outputdev);
 912 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 913                 console_devices[stdout][0] = outputdev;
 914                 console_devices[stderr][0] = outputdev;
 915 #endif
 916         }
 917
 918         /* Initializes input console */
 919         if (inputdev != NULL) {
 920                 console_setfile(stdin, inputdev);
 921 #if CONFIG_IS_ENABLED(CONSOLE_MUX)
 922                 console_devices[stdin][0] = inputdev;
 923 #endif
 924         }
 925
 926 #ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
 927         stdio_print_current_devices();
 928 #endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */
 929
 930         /* Setting environment variables */
 931         for (i = 0; i < MAX_FILES; i++) {
 932                 env_set(stdio_names[i], stdio_devices[i]->name);
 933         }
 934
 935         gd->flags |= GD_FLG_DEVINIT;    /* device initialization completed */
 936
 937 #if 0
 938         /* If nothing usable installed, use only the initial console */
 939         if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
 940                 return 0;
 941 #endif
 942         print_pre_console_buffer(PRE_CONSOLE_FLUSHPOINT2_EVERYTHING_BUT_SERIAL);
 943         return 0;
 944 }
 945
 946 #endif /* CONFIG_IS_ENABLED(SYS_CONSOLE_IS_IN_ENV) */