summaryrefslogtreecommitdiffstats
path: root/common/console.c
blob: c97a4f41e5fad05a568e7ba0f51b94c21f17873d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
/*
 * (C) Copyright 2000
 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

#include <config.h>
#include <common.h>
#include <stdarg.h>
#include <malloc.h>
#include <param.h>
#include <console.h>
#include <driver.h>
#include <fs.h>
#include <reloc.h>
#include <init.h>
#include <clock.h>
#include <kfifo.h>
#include <module.h>
#include <list.h>

LIST_HEAD(console_list);
EXPORT_SYMBOL(console_list);

#define CONSOLE_UNINITIALIZED	0
#define CONSOLE_INIT_EARLY	1
#define CONSOLE_INIT_FULL	2

extern char version_string[];

static void display_banner (void)
{
	printf (RELOC("\n\n%s\n\n"), RELOC_VAR(version_string));
	printf(RELOC("Board: " CONFIG_BOARDINFO "\n"));
}

static int __initdata initialized = 0;

static int console_std_set(struct device_d *dev, struct param_d *param,
		const char *val)
{
	struct console_device *cdev = dev->type_data;
	unsigned int flag = 0, i = 0;

	if (strchr(val, 'i') && cdev->f_caps & CONSOLE_STDIN) {
		cdev->active[i++] = 'i';
		flag |= CONSOLE_STDIN;
	}

	if (strchr(val, 'o') && cdev->f_caps & CONSOLE_STDOUT) {
		cdev->active[i++] = 'o';
		flag |= CONSOLE_STDOUT;
	}

	if (strchr(val, 'e') && cdev->f_caps & CONSOLE_STDERR) {
		cdev->active[i++] = 'e';
		flag |= CONSOLE_STDERR;
	}

	cdev->active[i] = 0;
	cdev->f_active = flag;

	return 0;
}

static int console_baudrate_set(struct device_d *dev, struct param_d *param,
		const char *val)
{
	struct console_device *cdev = dev->type_data;
	int baudrate;
	unsigned char c;

	baudrate = simple_strtoul(val, NULL, 10);

	if (cdev->f_active) {
		printf("## Switch baudrate to %d bps and press ENTER ...\n",
			baudrate);
		mdelay(50);
		cdev->setbrg(cdev, baudrate);
		mdelay(50);
		do {
			c = getc();
		} while (c != '\r' && c != '\n');
	} else
		cdev->setbrg(cdev, baudrate);

	sprintf(cdev->baudrate_string, "%d", baudrate);

	return 0;
}

static struct kfifo *console_input_buffer;
static struct kfifo *console_output_buffer;

int getc_buffer_flush(void)
{
	console_input_buffer = kfifo_alloc(1024);
	console_output_buffer = kfifo_alloc(1024);
	return 0;
}

postcore_initcall(getc_buffer_flush);

int console_register(struct console_device *newcdev)
{
	struct device_d *dev = newcdev->dev;
	int first = 0;
	char ch;

	if (newcdev->setbrg) {
		newcdev->baudrate_param.set = console_baudrate_set;
		newcdev->baudrate_param.name = "baudrate";
		sprintf(newcdev->baudrate_string, "%d",
			CONFIG_BAUDRATE);
		console_baudrate_set(dev, &newcdev->baudrate_param,
			newcdev->baudrate_string);
		newcdev->baudrate_param.value = newcdev->baudrate_string;
		dev_add_param(dev, &newcdev->baudrate_param);
	}

	newcdev->active_param.set = console_std_set;
	newcdev->active_param.name  = "active";
	newcdev->active_param.value = newcdev->active;
	dev_add_param(dev, &newcdev->active_param);

	initialized = CONSOLE_INIT_FULL;
#ifdef CONFIG_CONSOLE_ACTIVATE_ALL
	console_std_set(dev, &newcdev->active_param, "ioe");
#endif
#ifdef CONFIG_CONSOLE_ACTIVATE_FIRST
	if (list_empty(&console_list)) {
		first = 1;
		console_std_set(dev, &newcdev->active_param, "ioe");
	}
#endif

	list_add_tail(&newcdev->list, &console_list);

	if (console_output_buffer) {
		while (kfifo_getc(console_output_buffer, &ch) == 0)
			console_putc(CONSOLE_STDOUT, ch);
		kfifo_free(console_output_buffer);
		console_output_buffer = NULL;
	}

#ifndef CONFIG_HAS_EARLY_INIT
	if (first)
		display_banner();
#endif

	return 0;
}
EXPORT_SYMBOL(console_register);

int getc_raw(void)
{
	struct console_device *cdev;
	int active = 0;

	while (1) {
		for_each_console(cdev) {
			if (!(cdev->f_active & CONSOLE_STDIN))
				continue;
			active = 1;
			if (cdev->tstc(cdev))
				return cdev->getc(cdev);
		}
		if (!active)
			/* no active console found. bail out */
			return -1;
	}
}

int getc(void)
{
	unsigned char ch;
	uint64_t start;

	/*
	 * For 100us we read the characters from the serial driver
	 * into a kfifo. This helps us not to lose characters
	 * in small hardware fifos.
	 */
	start = get_time_ns();
	while (1) {
		if (tstc()) {
			kfifo_putc(console_input_buffer, getc_raw());

			start = get_time_ns();
		}
		if (is_timeout(start, 100 * USECOND) &&
				kfifo_len(console_input_buffer))
			break;
	}

	kfifo_getc(console_input_buffer, &ch);
	return ch;
}
EXPORT_SYMBOL(getc);

int fgetc(int fd)
{
	char c;

	if (!fd)
		return getc();
	return read(fd, &c, 1);
}
EXPORT_SYMBOL(fgetc);

int tstc(void)
{
	struct console_device *cdev;

	for_each_console(cdev) {
		if (!(cdev->f_active & CONSOLE_STDIN))
			continue;
		if (cdev->tstc(cdev))
			return 1;
	}

	return 0;
}
EXPORT_SYMBOL(tstc);

void __initdata *early_console_base;

void console_putc(unsigned int ch, char c)
{
	struct console_device *cdev;
	int init = INITDATA(initialized);

	switch (init) {
	case CONSOLE_UNINITIALIZED:
		kfifo_putc(console_output_buffer, c);
		return;

#ifdef CONFIG_HAS_EARLY_INIT
	case CONSOLE_INIT_EARLY:
		early_console_putc(INITDATA(early_console_base), c);
		return;
#endif

	case CONSOLE_INIT_FULL:
		for_each_console(cdev) {
			if (cdev->f_active & ch) {
				cdev->putc(cdev, c);
				if (c == '\n')
					cdev->putc(cdev, '\r');
			}
		}
		return;
	default:
		/* If we have problems inititalizing our data
		 * get them early
		 */
		hang();
	}
}
EXPORT_SYMBOL(console_putc);

int fputc(int fd, char c)
{
	if(list_empty(&console_list)) {
		if(!fd)
			console_putc(0, c);
		return 0;
	}

	if (fd == 1)
		putchar(c);
	else if (fd == 2)
		eputc(c);
	else
		return write(fd, &c, 1);
	return 0;
}
EXPORT_SYMBOL(fputc);

void console_puts(unsigned int ch, const char *str)
{
	const char *s = str;
	while (*s) {
		console_putc(ch, *s);
		if (*s == '\n')
			console_putc(ch, '\r');
		s++;
	}
}
EXPORT_SYMBOL(console_puts);

int fputs(int fd, const char *s)
{
	if (fd == 1)
		puts(s);
	else if (fd == 2)
		eputs(s);
	else
		return write(fd, s, strlen(s));
	return 0;
}
EXPORT_SYMBOL(fputs);

void console_flush(void)
{
	struct console_device *cdev;

	for_each_console(cdev) {
		if (cdev->flush)
			cdev->flush(cdev);
	}
}
EXPORT_SYMBOL(console_flush);

void fprintf (int file, const char *fmt, ...)
{
	va_list args;
	uint i;
	char printbuffer[CFG_PBSIZE];

	va_start (args, fmt);

	/* For this to work, printbuffer must be larger than
	 * anything we ever want to print.
	 */
	i = vsprintf (printbuffer, fmt, args);
	va_end (args);

	/* Print the string */
	fputs (file, printbuffer);
}
EXPORT_SYMBOL(fprintf);

int printf (const char *fmt, ...)
{
	va_list args;
	uint i;
	char printbuffer[CFG_PBSIZE];

	va_start (args, fmt);

	/* For this to work, printbuffer must be larger than
	 * anything we ever want to print.
	 */
	i = vsprintf (printbuffer, fmt, args);
	va_end (args);

	/* Print the string */
	puts (printbuffer);

	return i;
}
EXPORT_SYMBOL(printf);

int vprintf (const char *fmt, va_list args)
{
	uint i;
	char printbuffer[CFG_PBSIZE];

	/* For this to work, printbuffer must be larger than
	 * anything we ever want to print.
	 */
	i = vsprintf (printbuffer, fmt, args);

	/* Print the string */
	puts (printbuffer);

	return i;
}
EXPORT_SYMBOL(vprintf);

#ifndef ARCH_HAS_CTRLC
/* test if ctrl-c was pressed */
int ctrlc (void)
{
	if (tstc() && getc() == 3)
		return 1;
	return 0;
}
EXPORT_SYMBOL(ctrlc);
#endif /* ARCH_HAS_CTRC */

#ifdef CONFIG_HAS_EARLY_INIT

void early_console_start(const char *name, int baudrate)
{
	void *base = get_early_console_base(name);

	if (base) {
		early_console_init(base, baudrate);
		INITDATA(initialized) = CONSOLE_INIT_EARLY;
		INITDATA(early_console_base) = base;
		display_banner();
	}
}

#endif