summaryrefslogtreecommitdiff
path: root/common/stdio.c
blob: 0f2eb6f0d618a00fca5746b958846e8cc0958e7e (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net>
 *
 * Changes for multibus/multiadapter I2C support.
 *
 * (C) Copyright 2000
 * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
 */

#include <config.h>
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <log.h>
#include <stdarg.h>
#include <malloc.h>
#include <stdio_dev.h>
#include <serial.h>
#include <splash.h>
#include <i2c.h>
#include <asm/global_data.h>
#include <dm/device-internal.h>

DECLARE_GLOBAL_DATA_PTR;

static struct stdio_dev devs;
struct stdio_dev *stdio_devices[] = { NULL, NULL, NULL };
char *stdio_names[MAX_FILES] = { "stdin", "stdout", "stderr" };

int stdio_file_to_flags(const int file)
{
	switch (file) {
	case stdin:
		return DEV_FLAGS_INPUT;
	case stdout:
	case stderr:
		return DEV_FLAGS_OUTPUT;
	default:
		return -EINVAL;
	}
}

#if CONFIG_IS_ENABLED(SYS_DEVICE_NULLDEV)
static void nulldev_putc(struct stdio_dev *dev, const char c)
{
	/* nulldev is empty! */
}

static void nulldev_puts(struct stdio_dev *dev, const char *s)
{
	/* nulldev is empty! */
}

static int nulldev_input(struct stdio_dev *dev)
{
	/* nulldev is empty! */
	return 0;
}

static void nulldev_register(void)
{
	struct stdio_dev dev;

	memset(&dev, '\0', sizeof(dev));

	strcpy(dev.name, "nulldev");
	dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
	dev.putc = nulldev_putc;
	dev.puts = nulldev_puts;
	dev.getc = nulldev_input;
	dev.tstc = nulldev_input;

	stdio_register(&dev);
}
#else
static inline void nulldev_register(void) {}
#endif	/* SYS_DEVICE_NULLDEV */

static void stdio_serial_putc(struct stdio_dev *dev, const char c)
{
	serial_putc(c);
}

static void stdio_serial_puts(struct stdio_dev *dev, const char *s)
{
	serial_puts(s);
}

static int stdio_serial_getc(struct stdio_dev *dev)
{
	return serial_getc();
}

static int stdio_serial_tstc(struct stdio_dev *dev)
{
	return serial_tstc();
}

/**************************************************************************
 * SYSTEM DRIVERS
 **************************************************************************
 */

static void drv_system_init (void)
{
	struct stdio_dev dev;

	memset (&dev, 0, sizeof (dev));

	strcpy (dev.name, "serial");
	dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
	dev.putc = stdio_serial_putc;
	dev.puts = stdio_serial_puts;
	dev.getc = stdio_serial_getc;
	dev.tstc = stdio_serial_tstc;
	stdio_register (&dev);

	nulldev_register();
}

/**************************************************************************
 * DEVICES
 **************************************************************************
 */
struct list_head* stdio_get_list(void)
{
	return &devs.list;
}

/**
 * stdio_probe_device() - Find a device which provides the given stdio device
 *
 * This looks for a device of the given uclass which provides a particular
 * stdio device. It is currently really only useful for UCLASS_VIDEO.
 *
 * Ultimately we want to be able to probe a device by its stdio name. At
 * present devices register in their probe function (for video devices this
 * is done in vidconsole_post_probe()) and we don't know what name they will
 * use until they do so.
 * TODO(sjg@chromium.org): We should be able to determine the name before
 * probing, and probe the required device.
 *
 * @name:	stdio device name (e.g. "vidconsole")
 * id:		Uclass ID of device to look for (e.g. UCLASS_VIDEO)
 * @sdevp:	Returns stdout device, if found, else NULL
 * @return 0 if found, -ENOENT if no device found with that name, other -ve
 *	   on other error
 */
static int stdio_probe_device(const char *name, enum uclass_id id,
			      struct stdio_dev **sdevp)
{
	struct stdio_dev *sdev;
	struct udevice *dev;
	int seq, ret;

	*sdevp = NULL;
	seq = trailing_strtoln(name, NULL);
	if (seq == -1)
		seq = 0;
	ret = uclass_get_device_by_seq(id, seq, &dev);
	if (ret == -ENODEV)
		ret = uclass_first_device_err(id, &dev);
	if (ret) {
		debug("No %s device for seq %d (%s)\n", uclass_get_name(id),
		      seq, name);
		return ret;
	}
	/* The device should be be the last one registered */
	sdev = list_empty(&devs.list) ? NULL :
			list_last_entry(&devs.list, struct stdio_dev, list);
	if (!sdev || strcmp(sdev->name, name)) {
		debug("Device '%s' did not register with stdio as '%s'\n",
		      dev->name, name);
		return -ENOENT;
	}
	*sdevp = sdev;

	return 0;
}

struct stdio_dev *stdio_get_by_name(const char *name)
{
	struct list_head *pos;
	struct stdio_dev *sdev;

	if (!name)
		return NULL;

	list_for_each(pos, &devs.list) {
		sdev = list_entry(pos, struct stdio_dev, list);
		if (strcmp(sdev->name, name) == 0)
			return sdev;
	}
	if (IS_ENABLED(CONFIG_DM_VIDEO)) {
		/*
		 * We did not find a suitable stdio device. If there is a video
		 * driver with a name starting with 'vidconsole', we can try
		 * probing that in the hope that it will produce the required
		 * stdio device.
		 *
		 * This function is sometimes called with the entire value of
		 * 'stdout', which may include a list of devices separate by
		 * commas. Obviously this is not going to work, so we ignore
		 * that case. The call path in that case is
		 * console_init_r() -> console_search_dev() -> stdio_get_by_name()
		 */
		if (!strncmp(name, "vidconsole", 10) && !strchr(name, ',') &&
		    !stdio_probe_device(name, UCLASS_VIDEO, &sdev))
			return sdev;
	}

	return NULL;
}

struct stdio_dev *stdio_clone(struct stdio_dev *dev)
{
	struct stdio_dev *_dev;

	if (!dev)
		return NULL;

	_dev = calloc(1, sizeof(struct stdio_dev));
	if (!_dev)
		return NULL;

	memcpy(_dev, dev, sizeof(struct stdio_dev));

	return _dev;
}

int stdio_register_dev(struct stdio_dev *dev, struct stdio_dev **devp)
{
	struct stdio_dev *_dev;

	_dev = stdio_clone(dev);
	if (!_dev)
		return -ENODEV;
	list_add_tail(&_dev->list, &devs.list);
	if (devp)
		*devp = _dev;

	return 0;
}

int stdio_register(struct stdio_dev *dev)
{
	return stdio_register_dev(dev, NULL);
}

int stdio_deregister_dev(struct stdio_dev *dev, int force)
{
	struct list_head *pos;
	char temp_names[3][16];
	int i;

	/* get stdio devices (ListRemoveItem changes the dev list) */
	for (i = 0 ; i < MAX_FILES; i++) {
		if (stdio_devices[i] == dev) {
			if (force) {
				strcpy(temp_names[i], "nulldev");
				continue;
			}
			/* Device is assigned -> report error */
			return -EBUSY;
		}
		memcpy(&temp_names[i][0], stdio_devices[i]->name,
		       sizeof(temp_names[i]));
	}

	list_del(&dev->list);
	free(dev);

	/* reassign device list */
	list_for_each(pos, &devs.list) {
		dev = list_entry(pos, struct stdio_dev, list);
		for (i = 0 ; i < MAX_FILES; i++) {
			if (strcmp(dev->name, temp_names[i]) == 0)
				stdio_devices[i] = dev;
		}
	}

	return 0;
}

int stdio_init_tables(void)
{
#if defined(CONFIG_NEEDS_MANUAL_RELOC)
	/* already relocated for current ARM implementation */
	ulong relocation_offset = gd->reloc_off;
	int i;

	/* relocate device name pointers */
	for (i = 0; i < (sizeof (stdio_names) / sizeof (char *)); ++i) {
		stdio_names[i] = (char *) (((ulong) stdio_names[i]) +
						relocation_offset);
	}
#endif /* CONFIG_NEEDS_MANUAL_RELOC */

	/* Initialize the list */
	INIT_LIST_HEAD(&devs.list);

	return 0;
}

int stdio_add_devices(void)
{
	struct udevice *dev;
	struct uclass *uc;
	int ret;

	if (IS_ENABLED(CONFIG_DM_KEYBOARD)) {
		/*
		 * For now we probe all the devices here. At some point this
		 * should be done only when the devices are required - e.g. we
		 * have a list of input devices to start up in the stdin
		 * environment variable. That work probably makes more sense
		 * when stdio itself is converted to driver model.
		 *
		 * TODO(sjg@chromium.org): Convert changing
		 * uclass_first_device() etc. to return the device even on
		 * error. Then we could use that here.
		 */
		ret = uclass_get(UCLASS_KEYBOARD, &uc);
		if (ret)
			return ret;

		/*
		 * Don't report errors to the caller - assume that they are
		 * non-fatal
		 */
		uclass_foreach_dev(dev, uc) {
			ret = device_probe(dev);
			if (ret)
				printf("Failed to probe keyboard '%s'\n",
				       dev->name);
		}
	}
#if CONFIG_IS_ENABLED(SYS_I2C_LEGACY)
	i2c_init_all();
#endif
	if (IS_ENABLED(CONFIG_DM_VIDEO)) {
		/*
		 * If the console setting is not in environment variables then
		 * console_init_r() will not be calling iomux_doenv() (which
		 * calls console_search_dev()). So we will not dynamically add
		 * devices by calling stdio_probe_device().
		 *
		 * So just probe all video devices now so that whichever one is
		 * required will be available.
		 */
		struct udevice *vdev;
		int ret;

		if (!IS_ENABLED(CONFIG_SYS_CONSOLE_IS_IN_ENV)) {
			for (ret = uclass_first_device(UCLASS_VIDEO, &vdev);
			     vdev;
			     ret = uclass_next_device(&vdev))
				;
			if (ret)
				printf("%s: Video device failed (ret=%d)\n",
				       __func__, ret);
		}
		if (IS_ENABLED(CONFIG_SPLASH_SCREEN) &&
		    IS_ENABLED(CONFIG_CMD_BMP))
			splash_display();
	} else {
		if (IS_ENABLED(CONFIG_LCD))
			drv_lcd_init();
		if (IS_ENABLED(CONFIG_VIDEO) ||
		    IS_ENABLED(CONFIG_CFB_CONSOLE) ||
		    IS_ENABLED(CONFIG_VIDEO_VCXK))
			drv_video_init();
	}

#if defined(CONFIG_KEYBOARD) && !defined(CONFIG_DM_KEYBOARD)
	drv_keyboard_init();
#endif
	drv_system_init();
	serial_stdio_init();
#ifdef CONFIG_USB_TTY
	drv_usbtty_init();
#endif
	if (IS_ENABLED(CONFIG_NETCONSOLE))
		drv_nc_init();
#ifdef CONFIG_JTAG_CONSOLE
	drv_jtag_console_init();
#endif
	if (IS_ENABLED(CONFIG_CBMEM_CONSOLE))
		cbmemc_init();

	return 0;
}

int stdio_init(void)
{
	stdio_init_tables();
	stdio_add_devices();

	return 0;
}