xref: /openbmc/u-boot/common/console.c (revision 25dccd6f)
1 /*
2  * (C) Copyright 2000
3  * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23 
24 #include <common.h>
25 #include <stdarg.h>
26 #include <malloc.h>
27 #include <serial.h>
28 #include <stdio_dev.h>
29 #include <exports.h>
30 #include <environment.h>
31 
32 DECLARE_GLOBAL_DATA_PTR;
33 
34 static int on_console(const char *name, const char *value, enum env_op op,
35 	int flags)
36 {
37 	int console = -1;
38 
39 	/* Check for console redirection */
40 	if (strcmp(name, "stdin") == 0)
41 		console = stdin;
42 	else if (strcmp(name, "stdout") == 0)
43 		console = stdout;
44 	else if (strcmp(name, "stderr") == 0)
45 		console = stderr;
46 
47 	/* if not actually setting a console variable, we don't care */
48 	if (console == -1 || (gd->flags & GD_FLG_DEVINIT) == 0)
49 		return 0;
50 
51 	switch (op) {
52 	case env_op_create:
53 	case env_op_overwrite:
54 
55 #ifdef CONFIG_CONSOLE_MUX
56 		if (iomux_doenv(console, value))
57 			return 1;
58 #else
59 		/* Try assigning specified device */
60 		if (console_assign(console, value) < 0)
61 			return 1;
62 #endif /* CONFIG_CONSOLE_MUX */
63 		return 0;
64 
65 	case env_op_delete:
66 		if ((flags & H_FORCE) == 0)
67 			printf("Can't delete \"%s\"\n", name);
68 		return 1;
69 
70 	default:
71 		return 0;
72 	}
73 }
74 U_BOOT_ENV_CALLBACK(console, on_console);
75 
76 #ifdef CONFIG_SILENT_CONSOLE
77 static int on_silent(const char *name, const char *value, enum env_op op,
78 	int flags)
79 {
80 #ifndef CONFIG_SILENT_CONSOLE_UPDATE_ON_SET
81 	if (flags & H_INTERACTIVE)
82 		return 0;
83 #endif
84 #ifndef CONFIG_SILENT_CONSOLE_UPDATE_ON_RELOC
85 	if ((flags & H_INTERACTIVE) == 0)
86 		return 0;
87 #endif
88 
89 	if (value != NULL)
90 		gd->flags |= GD_FLG_SILENT;
91 	else
92 		gd->flags &= ~GD_FLG_SILENT;
93 
94 	return 0;
95 }
96 U_BOOT_ENV_CALLBACK(silent, on_silent);
97 #endif
98 
99 #ifdef CONFIG_SYS_CONSOLE_IS_IN_ENV
100 /*
101  * if overwrite_console returns 1, the stdin, stderr and stdout
102  * are switched to the serial port, else the settings in the
103  * environment are used
104  */
105 #ifdef CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
106 extern int overwrite_console(void);
107 #define OVERWRITE_CONSOLE overwrite_console()
108 #else
109 #define OVERWRITE_CONSOLE 0
110 #endif /* CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE */
111 
112 #endif /* CONFIG_SYS_CONSOLE_IS_IN_ENV */
113 
114 static int console_setfile(int file, struct stdio_dev * dev)
115 {
116 	int error = 0;
117 
118 	if (dev == NULL)
119 		return -1;
120 
121 	switch (file) {
122 	case stdin:
123 	case stdout:
124 	case stderr:
125 		/* Start new device */
126 		if (dev->start) {
127 			error = dev->start();
128 			/* If it's not started dont use it */
129 			if (error < 0)
130 				break;
131 		}
132 
133 		/* Assign the new device (leaving the existing one started) */
134 		stdio_devices[file] = dev;
135 
136 		/*
137 		 * Update monitor functions
138 		 * (to use the console stuff by other applications)
139 		 */
140 		switch (file) {
141 		case stdin:
142 			gd->jt[XF_getc] = dev->getc;
143 			gd->jt[XF_tstc] = dev->tstc;
144 			break;
145 		case stdout:
146 			gd->jt[XF_putc] = dev->putc;
147 			gd->jt[XF_puts] = dev->puts;
148 			gd->jt[XF_printf] = printf;
149 			break;
150 		}
151 		break;
152 
153 	default:		/* Invalid file ID */
154 		error = -1;
155 	}
156 	return error;
157 }
158 
159 #if defined(CONFIG_CONSOLE_MUX)
160 /** Console I/O multiplexing *******************************************/
161 
162 static struct stdio_dev *tstcdev;
163 struct stdio_dev **console_devices[MAX_FILES];
164 int cd_count[MAX_FILES];
165 
166 /*
167  * This depends on tstc() always being called before getc().
168  * This is guaranteed to be true because this routine is called
169  * only from fgetc() which assures it.
170  * No attempt is made to demultiplex multiple input sources.
171  */
172 static int console_getc(int file)
173 {
174 	unsigned char ret;
175 
176 	/* This is never called with testcdev == NULL */
177 	ret = tstcdev->getc();
178 	tstcdev = NULL;
179 	return ret;
180 }
181 
182 static int console_tstc(int file)
183 {
184 	int i, ret;
185 	struct stdio_dev *dev;
186 
187 	disable_ctrlc(1);
188 	for (i = 0; i < cd_count[file]; i++) {
189 		dev = console_devices[file][i];
190 		if (dev->tstc != NULL) {
191 			ret = dev->tstc();
192 			if (ret > 0) {
193 				tstcdev = dev;
194 				disable_ctrlc(0);
195 				return ret;
196 			}
197 		}
198 	}
199 	disable_ctrlc(0);
200 
201 	return 0;
202 }
203 
204 static void console_putc(int file, const char c)
205 {
206 	int i;
207 	struct stdio_dev *dev;
208 
209 	for (i = 0; i < cd_count[file]; i++) {
210 		dev = console_devices[file][i];
211 		if (dev->putc != NULL)
212 			dev->putc(c);
213 	}
214 }
215 
216 static void console_puts(int file, const char *s)
217 {
218 	int i;
219 	struct stdio_dev *dev;
220 
221 	for (i = 0; i < cd_count[file]; i++) {
222 		dev = console_devices[file][i];
223 		if (dev->puts != NULL)
224 			dev->puts(s);
225 	}
226 }
227 
228 static inline void console_printdevs(int file)
229 {
230 	iomux_printdevs(file);
231 }
232 
233 static inline void console_doenv(int file, struct stdio_dev *dev)
234 {
235 	iomux_doenv(file, dev->name);
236 }
237 #else
238 static inline int console_getc(int file)
239 {
240 	return stdio_devices[file]->getc();
241 }
242 
243 static inline int console_tstc(int file)
244 {
245 	return stdio_devices[file]->tstc();
246 }
247 
248 static inline void console_putc(int file, const char c)
249 {
250 	stdio_devices[file]->putc(c);
251 }
252 
253 static inline void console_puts(int file, const char *s)
254 {
255 	stdio_devices[file]->puts(s);
256 }
257 
258 static inline void console_printdevs(int file)
259 {
260 	printf("%s\n", stdio_devices[file]->name);
261 }
262 
263 static inline void console_doenv(int file, struct stdio_dev *dev)
264 {
265 	console_setfile(file, dev);
266 }
267 #endif /* defined(CONFIG_CONSOLE_MUX) */
268 
269 /** U-Boot INITIAL CONSOLE-NOT COMPATIBLE FUNCTIONS *************************/
270 
271 int serial_printf(const char *fmt, ...)
272 {
273 	va_list args;
274 	uint i;
275 	char printbuffer[CONFIG_SYS_PBSIZE];
276 
277 	va_start(args, fmt);
278 
279 	/* For this to work, printbuffer must be larger than
280 	 * anything we ever want to print.
281 	 */
282 	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
283 	va_end(args);
284 
285 	serial_puts(printbuffer);
286 	return i;
287 }
288 
289 int fgetc(int file)
290 {
291 	if (file < MAX_FILES) {
292 #if defined(CONFIG_CONSOLE_MUX)
293 		/*
294 		 * Effectively poll for input wherever it may be available.
295 		 */
296 		for (;;) {
297 			/*
298 			 * Upper layer may have already called tstc() so
299 			 * check for that first.
300 			 */
301 			if (tstcdev != NULL)
302 				return console_getc(file);
303 			console_tstc(file);
304 #ifdef CONFIG_WATCHDOG
305 			/*
306 			 * If the watchdog must be rate-limited then it should
307 			 * already be handled in board-specific code.
308 			 */
309 			 udelay(1);
310 #endif
311 		}
312 #else
313 		return console_getc(file);
314 #endif
315 	}
316 
317 	return -1;
318 }
319 
320 int ftstc(int file)
321 {
322 	if (file < MAX_FILES)
323 		return console_tstc(file);
324 
325 	return -1;
326 }
327 
328 void fputc(int file, const char c)
329 {
330 	if (file < MAX_FILES)
331 		console_putc(file, c);
332 }
333 
334 void fputs(int file, const char *s)
335 {
336 	if (file < MAX_FILES)
337 		console_puts(file, s);
338 }
339 
340 int fprintf(int file, const char *fmt, ...)
341 {
342 	va_list args;
343 	uint i;
344 	char printbuffer[CONFIG_SYS_PBSIZE];
345 
346 	va_start(args, fmt);
347 
348 	/* For this to work, printbuffer must be larger than
349 	 * anything we ever want to print.
350 	 */
351 	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
352 	va_end(args);
353 
354 	/* Send to desired file */
355 	fputs(file, printbuffer);
356 	return i;
357 }
358 
359 /** U-Boot INITIAL CONSOLE-COMPATIBLE FUNCTION *****************************/
360 
361 int getc(void)
362 {
363 #ifdef CONFIG_DISABLE_CONSOLE
364 	if (gd->flags & GD_FLG_DISABLE_CONSOLE)
365 		return 0;
366 #endif
367 
368 	if (!gd->have_console)
369 		return 0;
370 
371 	if (gd->flags & GD_FLG_DEVINIT) {
372 		/* Get from the standard input */
373 		return fgetc(stdin);
374 	}
375 
376 	/* Send directly to the handler */
377 	return serial_getc();
378 }
379 
380 int tstc(void)
381 {
382 #ifdef CONFIG_DISABLE_CONSOLE
383 	if (gd->flags & GD_FLG_DISABLE_CONSOLE)
384 		return 0;
385 #endif
386 
387 	if (!gd->have_console)
388 		return 0;
389 
390 	if (gd->flags & GD_FLG_DEVINIT) {
391 		/* Test the standard input */
392 		return ftstc(stdin);
393 	}
394 
395 	/* Send directly to the handler */
396 	return serial_tstc();
397 }
398 
399 #ifdef CONFIG_PRE_CONSOLE_BUFFER
400 #define CIRC_BUF_IDX(idx) ((idx) % (unsigned long)CONFIG_PRE_CON_BUF_SZ)
401 
402 static void pre_console_putc(const char c)
403 {
404 	char *buffer = (char *)CONFIG_PRE_CON_BUF_ADDR;
405 
406 	buffer[CIRC_BUF_IDX(gd->precon_buf_idx++)] = c;
407 }
408 
409 static void pre_console_puts(const char *s)
410 {
411 	while (*s)
412 		pre_console_putc(*s++);
413 }
414 
415 static void print_pre_console_buffer(void)
416 {
417 	unsigned long i = 0;
418 	char *buffer = (char *)CONFIG_PRE_CON_BUF_ADDR;
419 
420 	if (gd->precon_buf_idx > CONFIG_PRE_CON_BUF_SZ)
421 		i = gd->precon_buf_idx - CONFIG_PRE_CON_BUF_SZ;
422 
423 	while (i < gd->precon_buf_idx)
424 		putc(buffer[CIRC_BUF_IDX(i++)]);
425 }
426 #else
427 static inline void pre_console_putc(const char c) {}
428 static inline void pre_console_puts(const char *s) {}
429 static inline void print_pre_console_buffer(void) {}
430 #endif
431 
432 void putc(const char c)
433 {
434 #ifdef CONFIG_SILENT_CONSOLE
435 	if (gd->flags & GD_FLG_SILENT)
436 		return;
437 #endif
438 
439 #ifdef CONFIG_DISABLE_CONSOLE
440 	if (gd->flags & GD_FLG_DISABLE_CONSOLE)
441 		return;
442 #endif
443 
444 	if (!gd->have_console)
445 		return pre_console_putc(c);
446 
447 	if (gd->flags & GD_FLG_DEVINIT) {
448 		/* Send to the standard output */
449 		fputc(stdout, c);
450 	} else {
451 		/* Send directly to the handler */
452 		serial_putc(c);
453 	}
454 }
455 
456 void puts(const char *s)
457 {
458 #ifdef CONFIG_SILENT_CONSOLE
459 	if (gd->flags & GD_FLG_SILENT)
460 		return;
461 #endif
462 
463 #ifdef CONFIG_DISABLE_CONSOLE
464 	if (gd->flags & GD_FLG_DISABLE_CONSOLE)
465 		return;
466 #endif
467 
468 	if (!gd->have_console)
469 		return pre_console_puts(s);
470 
471 	if (gd->flags & GD_FLG_DEVINIT) {
472 		/* Send to the standard output */
473 		fputs(stdout, s);
474 	} else {
475 		/* Send directly to the handler */
476 		serial_puts(s);
477 	}
478 }
479 
480 int printf(const char *fmt, ...)
481 {
482 	va_list args;
483 	uint i;
484 	char printbuffer[CONFIG_SYS_PBSIZE];
485 
486 #ifndef CONFIG_PRE_CONSOLE_BUFFER
487 	if (!gd->have_console)
488 		return 0;
489 #endif
490 
491 	va_start(args, fmt);
492 
493 	/* For this to work, printbuffer must be larger than
494 	 * anything we ever want to print.
495 	 */
496 	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
497 	va_end(args);
498 
499 	/* Print the string */
500 	puts(printbuffer);
501 	return i;
502 }
503 
504 int vprintf(const char *fmt, va_list args)
505 {
506 	uint i;
507 	char printbuffer[CONFIG_SYS_PBSIZE];
508 
509 #ifndef CONFIG_PRE_CONSOLE_BUFFER
510 	if (!gd->have_console)
511 		return 0;
512 #endif
513 
514 	/* For this to work, printbuffer must be larger than
515 	 * anything we ever want to print.
516 	 */
517 	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
518 
519 	/* Print the string */
520 	puts(printbuffer);
521 	return i;
522 }
523 
524 /* test if ctrl-c was pressed */
525 static int ctrlc_disabled = 0;	/* see disable_ctrl() */
526 static int ctrlc_was_pressed = 0;
527 int ctrlc(void)
528 {
529 	if (!ctrlc_disabled && gd->have_console) {
530 		if (tstc()) {
531 			switch (getc()) {
532 			case 0x03:		/* ^C - Control C */
533 				ctrlc_was_pressed = 1;
534 				return 1;
535 			default:
536 				break;
537 			}
538 		}
539 	}
540 	return 0;
541 }
542 
543 /* pass 1 to disable ctrlc() checking, 0 to enable.
544  * returns previous state
545  */
546 int disable_ctrlc(int disable)
547 {
548 	int prev = ctrlc_disabled;	/* save previous state */
549 
550 	ctrlc_disabled = disable;
551 	return prev;
552 }
553 
554 int had_ctrlc (void)
555 {
556 	return ctrlc_was_pressed;
557 }
558 
559 void clear_ctrlc(void)
560 {
561 	ctrlc_was_pressed = 0;
562 }
563 
564 #ifdef CONFIG_MODEM_SUPPORT_DEBUG
565 char	screen[1024];
566 char *cursor = screen;
567 int once = 0;
568 inline void dbg(const char *fmt, ...)
569 {
570 	va_list	args;
571 	uint	i;
572 	char	printbuffer[CONFIG_SYS_PBSIZE];
573 
574 	if (!once) {
575 		memset(screen, 0, sizeof(screen));
576 		once++;
577 	}
578 
579 	va_start(args, fmt);
580 
581 	/* For this to work, printbuffer must be larger than
582 	 * anything we ever want to print.
583 	 */
584 	i = vsnprintf(printbuffer, sizeof(printbuffer), fmt, args);
585 	va_end(args);
586 
587 	if ((screen + sizeof(screen) - 1 - cursor)
588 	    < strlen(printbuffer) + 1) {
589 		memset(screen, 0, sizeof(screen));
590 		cursor = screen;
591 	}
592 	sprintf(cursor, printbuffer);
593 	cursor += strlen(printbuffer);
594 
595 }
596 #else
597 inline void dbg(const char *fmt, ...)
598 {
599 }
600 #endif
601 
602 /** U-Boot INIT FUNCTIONS *************************************************/
603 
604 struct stdio_dev *search_device(int flags, const char *name)
605 {
606 	struct stdio_dev *dev;
607 
608 	dev = stdio_get_by_name(name);
609 
610 	if (dev && (dev->flags & flags))
611 		return dev;
612 
613 	return NULL;
614 }
615 
616 int console_assign(int file, const char *devname)
617 {
618 	int flag;
619 	struct stdio_dev *dev;
620 
621 	/* Check for valid file */
622 	switch (file) {
623 	case stdin:
624 		flag = DEV_FLAGS_INPUT;
625 		break;
626 	case stdout:
627 	case stderr:
628 		flag = DEV_FLAGS_OUTPUT;
629 		break;
630 	default:
631 		return -1;
632 	}
633 
634 	/* Check for valid device name */
635 
636 	dev = search_device(flag, devname);
637 
638 	if (dev)
639 		return console_setfile(file, dev);
640 
641 	return -1;
642 }
643 
644 /* Called before relocation - use serial functions */
645 int console_init_f(void)
646 {
647 	gd->have_console = 1;
648 
649 #ifdef CONFIG_SILENT_CONSOLE
650 	if (getenv("silent") != NULL)
651 		gd->flags |= GD_FLG_SILENT;
652 #endif
653 
654 	print_pre_console_buffer();
655 
656 	return 0;
657 }
658 
659 void stdio_print_current_devices(void)
660 {
661 	/* Print information */
662 	puts("In:    ");
663 	if (stdio_devices[stdin] == NULL) {
664 		puts("No input devices available!\n");
665 	} else {
666 		printf ("%s\n", stdio_devices[stdin]->name);
667 	}
668 
669 	puts("Out:   ");
670 	if (stdio_devices[stdout] == NULL) {
671 		puts("No output devices available!\n");
672 	} else {
673 		printf ("%s\n", stdio_devices[stdout]->name);
674 	}
675 
676 	puts("Err:   ");
677 	if (stdio_devices[stderr] == NULL) {
678 		puts("No error devices available!\n");
679 	} else {
680 		printf ("%s\n", stdio_devices[stderr]->name);
681 	}
682 }
683 
684 #ifdef CONFIG_SYS_CONSOLE_IS_IN_ENV
685 /* Called after the relocation - use desired console functions */
686 int console_init_r(void)
687 {
688 	char *stdinname, *stdoutname, *stderrname;
689 	struct stdio_dev *inputdev = NULL, *outputdev = NULL, *errdev = NULL;
690 #ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
691 	int i;
692 #endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */
693 #ifdef CONFIG_CONSOLE_MUX
694 	int iomux_err = 0;
695 #endif
696 
697 	/* set default handlers at first */
698 	gd->jt[XF_getc] = serial_getc;
699 	gd->jt[XF_tstc] = serial_tstc;
700 	gd->jt[XF_putc] = serial_putc;
701 	gd->jt[XF_puts] = serial_puts;
702 	gd->jt[XF_printf] = serial_printf;
703 
704 	/* stdin stdout and stderr are in environment */
705 	/* scan for it */
706 	stdinname  = getenv("stdin");
707 	stdoutname = getenv("stdout");
708 	stderrname = getenv("stderr");
709 
710 	if (OVERWRITE_CONSOLE == 0) {	/* if not overwritten by config switch */
711 		inputdev  = search_device(DEV_FLAGS_INPUT,  stdinname);
712 		outputdev = search_device(DEV_FLAGS_OUTPUT, stdoutname);
713 		errdev    = search_device(DEV_FLAGS_OUTPUT, stderrname);
714 #ifdef CONFIG_CONSOLE_MUX
715 		iomux_err = iomux_doenv(stdin, stdinname);
716 		iomux_err += iomux_doenv(stdout, stdoutname);
717 		iomux_err += iomux_doenv(stderr, stderrname);
718 		if (!iomux_err)
719 			/* Successful, so skip all the code below. */
720 			goto done;
721 #endif
722 	}
723 	/* if the devices are overwritten or not found, use default device */
724 	if (inputdev == NULL) {
725 		inputdev  = search_device(DEV_FLAGS_INPUT,  "serial");
726 	}
727 	if (outputdev == NULL) {
728 		outputdev = search_device(DEV_FLAGS_OUTPUT, "serial");
729 	}
730 	if (errdev == NULL) {
731 		errdev    = search_device(DEV_FLAGS_OUTPUT, "serial");
732 	}
733 	/* Initializes output console first */
734 	if (outputdev != NULL) {
735 		/* need to set a console if not done above. */
736 		console_doenv(stdout, outputdev);
737 	}
738 	if (errdev != NULL) {
739 		/* need to set a console if not done above. */
740 		console_doenv(stderr, errdev);
741 	}
742 	if (inputdev != NULL) {
743 		/* need to set a console if not done above. */
744 		console_doenv(stdin, inputdev);
745 	}
746 
747 #ifdef CONFIG_CONSOLE_MUX
748 done:
749 #endif
750 
751 #ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
752 	stdio_print_current_devices();
753 #endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */
754 
755 #ifdef CONFIG_SYS_CONSOLE_ENV_OVERWRITE
756 	/* set the environment variables (will overwrite previous env settings) */
757 	for (i = 0; i < 3; i++) {
758 		setenv(stdio_names[i], stdio_devices[i]->name);
759 	}
760 #endif /* CONFIG_SYS_CONSOLE_ENV_OVERWRITE */
761 
762 	gd->flags |= GD_FLG_DEVINIT;	/* device initialization completed */
763 
764 #if 0
765 	/* If nothing usable installed, use only the initial console */
766 	if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
767 		return 0;
768 #endif
769 	return 0;
770 }
771 
772 #else /* CONFIG_SYS_CONSOLE_IS_IN_ENV */
773 
774 /* Called after the relocation - use desired console functions */
775 int console_init_r(void)
776 {
777 	struct stdio_dev *inputdev = NULL, *outputdev = NULL;
778 	int i;
779 	struct list_head *list = stdio_get_list();
780 	struct list_head *pos;
781 	struct stdio_dev *dev;
782 
783 #ifdef CONFIG_SPLASH_SCREEN
784 	/*
785 	 * suppress all output if splash screen is enabled and we have
786 	 * a bmp to display. We redirect the output from frame buffer
787 	 * console to serial console in this case or suppress it if
788 	 * "silent" mode was requested.
789 	 */
790 	if (getenv("splashimage") != NULL) {
791 		if (!(gd->flags & GD_FLG_SILENT))
792 			outputdev = search_device (DEV_FLAGS_OUTPUT, "serial");
793 	}
794 #endif
795 
796 	/* Scan devices looking for input and output devices */
797 	list_for_each(pos, list) {
798 		dev = list_entry(pos, struct stdio_dev, list);
799 
800 		if ((dev->flags & DEV_FLAGS_INPUT) && (inputdev == NULL)) {
801 			inputdev = dev;
802 		}
803 		if ((dev->flags & DEV_FLAGS_OUTPUT) && (outputdev == NULL)) {
804 			outputdev = dev;
805 		}
806 		if(inputdev && outputdev)
807 			break;
808 	}
809 
810 	/* Initializes output console first */
811 	if (outputdev != NULL) {
812 		console_setfile(stdout, outputdev);
813 		console_setfile(stderr, outputdev);
814 #ifdef CONFIG_CONSOLE_MUX
815 		console_devices[stdout][0] = outputdev;
816 		console_devices[stderr][0] = outputdev;
817 #endif
818 	}
819 
820 	/* Initializes input console */
821 	if (inputdev != NULL) {
822 		console_setfile(stdin, inputdev);
823 #ifdef CONFIG_CONSOLE_MUX
824 		console_devices[stdin][0] = inputdev;
825 #endif
826 	}
827 
828 #ifndef CONFIG_SYS_CONSOLE_INFO_QUIET
829 	stdio_print_current_devices();
830 #endif /* CONFIG_SYS_CONSOLE_INFO_QUIET */
831 
832 	/* Setting environment variables */
833 	for (i = 0; i < 3; i++) {
834 		setenv(stdio_names[i], stdio_devices[i]->name);
835 	}
836 
837 	gd->flags |= GD_FLG_DEVINIT;	/* device initialization completed */
838 
839 #if 0
840 	/* If nothing usable installed, use only the initial console */
841 	if ((stdio_devices[stdin] == NULL) && (stdio_devices[stdout] == NULL))
842 		return 0;
843 #endif
844 
845 	return 0;
846 }
847 
848 #endif /* CONFIG_SYS_CONSOLE_IS_IN_ENV */
849