xref: /openbmc/u-boot/common/stdio.c (revision 2a046ff5)
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Copyright (C) 2009 Sergey Kubushyn <ksi@koi8.net>
4  *
5  * Changes for multibus/multiadapter I2C support.
6  *
7  * (C) Copyright 2000
8  * Paolo Scaffardi, AIRVENT SAM s.p.a - RIMINI(ITALY), arsenio@tin.it
9  */
10 
11 #include <config.h>
12 #include <common.h>
13 #include <dm.h>
14 #include <errno.h>
15 #include <stdarg.h>
16 #include <malloc.h>
17 #include <stdio_dev.h>
18 #include <serial.h>
19 
20 #if defined(CONFIG_SYS_I2C)
21 #include <i2c.h>
22 #endif
23 
24 #include <dm/device-internal.h>
25 
26 DECLARE_GLOBAL_DATA_PTR;
27 
28 static struct stdio_dev devs;
29 struct stdio_dev *stdio_devices[] = { NULL, NULL, NULL };
30 char *stdio_names[MAX_FILES] = { "stdin", "stdout", "stderr" };
31 
32 #if defined(CONFIG_SPLASH_SCREEN) && !defined(CONFIG_SYS_DEVICE_NULLDEV)
33 #define	CONFIG_SYS_DEVICE_NULLDEV	1
34 #endif
35 
36 #if CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER)
37 #define	CONFIG_SYS_DEVICE_NULLDEV	1
38 #endif
39 
40 #ifdef CONFIG_SYS_DEVICE_NULLDEV
41 static void nulldev_putc(struct stdio_dev *dev, const char c)
42 {
43 	/* nulldev is empty! */
44 }
45 
46 static void nulldev_puts(struct stdio_dev *dev, const char *s)
47 {
48 	/* nulldev is empty! */
49 }
50 
51 static int nulldev_input(struct stdio_dev *dev)
52 {
53 	/* nulldev is empty! */
54 	return 0;
55 }
56 #endif
57 
58 static void stdio_serial_putc(struct stdio_dev *dev, const char c)
59 {
60 	serial_putc(c);
61 }
62 
63 static void stdio_serial_puts(struct stdio_dev *dev, const char *s)
64 {
65 	serial_puts(s);
66 }
67 
68 static int stdio_serial_getc(struct stdio_dev *dev)
69 {
70 	return serial_getc();
71 }
72 
73 static int stdio_serial_tstc(struct stdio_dev *dev)
74 {
75 	return serial_tstc();
76 }
77 
78 /**************************************************************************
79  * SYSTEM DRIVERS
80  **************************************************************************
81  */
82 
83 static void drv_system_init (void)
84 {
85 	struct stdio_dev dev;
86 
87 	memset (&dev, 0, sizeof (dev));
88 
89 	strcpy (dev.name, "serial");
90 	dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
91 	dev.putc = stdio_serial_putc;
92 	dev.puts = stdio_serial_puts;
93 	dev.getc = stdio_serial_getc;
94 	dev.tstc = stdio_serial_tstc;
95 	stdio_register (&dev);
96 
97 #ifdef CONFIG_SYS_DEVICE_NULLDEV
98 	memset (&dev, 0, sizeof (dev));
99 
100 	strcpy (dev.name, "nulldev");
101 	dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
102 	dev.putc = nulldev_putc;
103 	dev.puts = nulldev_puts;
104 	dev.getc = nulldev_input;
105 	dev.tstc = nulldev_input;
106 
107 	stdio_register (&dev);
108 #endif
109 }
110 
111 /**************************************************************************
112  * DEVICES
113  **************************************************************************
114  */
115 struct list_head* stdio_get_list(void)
116 {
117 	return &(devs.list);
118 }
119 
120 #ifdef CONFIG_DM_VIDEO
121 /**
122  * stdio_probe_device() - Find a device which provides the given stdio device
123  *
124  * This looks for a device of the given uclass which provides a particular
125  * stdio device. It is currently really only useful for UCLASS_VIDEO.
126  *
127  * Ultimately we want to be able to probe a device by its stdio name. At
128  * present devices register in their probe function (for video devices this
129  * is done in vidconsole_post_probe()) and we don't know what name they will
130  * use until they do so.
131  * TODO(sjg@chromium.org): We should be able to determine the name before
132  * probing, and probe the required device.
133  *
134  * @name:	stdio device name (e.g. "vidconsole")
135  * id:		Uclass ID of device to look for (e.g. UCLASS_VIDEO)
136  * @sdevp:	Returns stdout device, if found, else NULL
137  * @return 0 if found, -ENOENT if no device found with that name, other -ve
138  *	   on other error
139  */
140 static int stdio_probe_device(const char *name, enum uclass_id id,
141 			      struct stdio_dev **sdevp)
142 {
143 	struct stdio_dev *sdev;
144 	struct udevice *dev;
145 	int seq, ret;
146 
147 	*sdevp = NULL;
148 	seq = trailing_strtoln(name, NULL);
149 	if (seq == -1)
150 		seq = 0;
151 	ret = uclass_get_device_by_seq(id, seq, &dev);
152 	if (ret == -ENODEV)
153 		ret = uclass_first_device_err(id, &dev);
154 	if (ret) {
155 		debug("No %s device for seq %d (%s)\n", uclass_get_name(id),
156 		      seq, name);
157 		return ret;
158 	}
159 	/* The device should be be the last one registered */
160 	sdev = list_empty(&devs.list) ? NULL :
161 			list_last_entry(&devs.list, struct stdio_dev, list);
162 	if (!sdev || strcmp(sdev->name, name)) {
163 		debug("Device '%s' did not register with stdio as '%s'\n",
164 		      dev->name, name);
165 		return -ENOENT;
166 	}
167 	*sdevp = sdev;
168 
169 	return 0;
170 }
171 #endif
172 
173 struct stdio_dev *stdio_get_by_name(const char *name)
174 {
175 	struct list_head *pos;
176 	struct stdio_dev *sdev;
177 
178 	if (!name)
179 		return NULL;
180 
181 	list_for_each(pos, &(devs.list)) {
182 		sdev = list_entry(pos, struct stdio_dev, list);
183 		if (strcmp(sdev->name, name) == 0)
184 			return sdev;
185 	}
186 #ifdef CONFIG_DM_VIDEO
187 	/*
188 	 * We did not find a suitable stdio device. If there is a video
189 	 * driver with a name starting with 'vidconsole', we can try probing
190 	 * that in the hope that it will produce the required stdio device.
191 	 *
192 	 * This function is sometimes called with the entire value of
193 	 * 'stdout', which may include a list of devices separate by commas.
194 	 * Obviously this is not going to work, so we ignore that case. The
195 	 * call path in that case is console_init_r() -> search_device() ->
196 	 * stdio_get_by_name().
197 	 */
198 	if (!strncmp(name, "vidconsole", 10) && !strchr(name, ',') &&
199 	    !stdio_probe_device(name, UCLASS_VIDEO, &sdev))
200 		return sdev;
201 #endif
202 
203 	return NULL;
204 }
205 
206 struct stdio_dev* stdio_clone(struct stdio_dev *dev)
207 {
208 	struct stdio_dev *_dev;
209 
210 	if(!dev)
211 		return NULL;
212 
213 	_dev = calloc(1, sizeof(struct stdio_dev));
214 
215 	if(!_dev)
216 		return NULL;
217 
218 	memcpy(_dev, dev, sizeof(struct stdio_dev));
219 
220 	return _dev;
221 }
222 
223 int stdio_register_dev(struct stdio_dev *dev, struct stdio_dev **devp)
224 {
225 	struct stdio_dev *_dev;
226 
227 	_dev = stdio_clone(dev);
228 	if(!_dev)
229 		return -ENODEV;
230 	list_add_tail(&(_dev->list), &(devs.list));
231 	if (devp)
232 		*devp = _dev;
233 
234 	return 0;
235 }
236 
237 int stdio_register(struct stdio_dev *dev)
238 {
239 	return stdio_register_dev(dev, NULL);
240 }
241 
242 /* deregister the device "devname".
243  * returns 0 if success, -1 if device is assigned and 1 if devname not found
244  */
245 #if CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER)
246 int stdio_deregister_dev(struct stdio_dev *dev, int force)
247 {
248 	int l;
249 	struct list_head *pos;
250 	char temp_names[3][16];
251 
252 	/* get stdio devices (ListRemoveItem changes the dev list) */
253 	for (l=0 ; l< MAX_FILES; l++) {
254 		if (stdio_devices[l] == dev) {
255 			if (force) {
256 				strcpy(temp_names[l], "nulldev");
257 				continue;
258 			}
259 			/* Device is assigned -> report error */
260 			return -1;
261 		}
262 		memcpy (&temp_names[l][0],
263 			stdio_devices[l]->name,
264 			sizeof(temp_names[l]));
265 	}
266 
267 	list_del(&(dev->list));
268 	free(dev);
269 
270 	/* reassign Device list */
271 	list_for_each(pos, &(devs.list)) {
272 		dev = list_entry(pos, struct stdio_dev, list);
273 		for (l=0 ; l< MAX_FILES; l++) {
274 			if(strcmp(dev->name, temp_names[l]) == 0)
275 				stdio_devices[l] = dev;
276 		}
277 	}
278 	return 0;
279 }
280 
281 int stdio_deregister(const char *devname, int force)
282 {
283 	struct stdio_dev *dev;
284 
285 	dev = stdio_get_by_name(devname);
286 
287 	if (!dev) /* device not found */
288 		return -ENODEV;
289 
290 	return stdio_deregister_dev(dev, force);
291 }
292 #endif /* CONFIG_IS_ENABLED(SYS_STDIO_DEREGISTER) */
293 
294 int stdio_init_tables(void)
295 {
296 #if defined(CONFIG_NEEDS_MANUAL_RELOC)
297 	/* already relocated for current ARM implementation */
298 	ulong relocation_offset = gd->reloc_off;
299 	int i;
300 
301 	/* relocate device name pointers */
302 	for (i = 0; i < (sizeof (stdio_names) / sizeof (char *)); ++i) {
303 		stdio_names[i] = (char *) (((ulong) stdio_names[i]) +
304 						relocation_offset);
305 	}
306 #endif /* CONFIG_NEEDS_MANUAL_RELOC */
307 
308 	/* Initialize the list */
309 	INIT_LIST_HEAD(&(devs.list));
310 
311 	return 0;
312 }
313 
314 int stdio_add_devices(void)
315 {
316 #ifdef CONFIG_DM_KEYBOARD
317 	struct udevice *dev;
318 	struct uclass *uc;
319 	int ret;
320 
321 	/*
322 	 * For now we probe all the devices here. At some point this should be
323 	 * done only when the devices are required - e.g. we have a list of
324 	 * input devices to start up in the stdin environment variable. That
325 	 * work probably makes more sense when stdio itself is converted to
326 	 * driver model.
327 	 *
328 	 * TODO(sjg@chromium.org): Convert changing uclass_first_device() etc.
329 	 * to return the device even on error. Then we could use that here.
330 	 */
331 	ret = uclass_get(UCLASS_KEYBOARD, &uc);
332 	if (ret)
333 		return ret;
334 
335 	/* Don't report errors to the caller - assume that they are non-fatal */
336 	uclass_foreach_dev(dev, uc) {
337 		ret = device_probe(dev);
338 		if (ret)
339 			printf("Failed to probe keyboard '%s'\n", dev->name);
340 	}
341 #endif
342 #ifdef CONFIG_SYS_I2C
343 	i2c_init_all();
344 #else
345 #endif
346 #ifdef CONFIG_DM_VIDEO
347 	/*
348 	 * If the console setting is not in environment variables then
349 	 * console_init_r() will not be calling iomux_doenv() (which calls
350 	 * search_device()). So we will not dynamically add devices by
351 	 * calling stdio_probe_device().
352 	 *
353 	 * So just probe all video devices now so that whichever one is
354 	 * required will be available.
355 	 */
356 #ifndef CONFIG_SYS_CONSOLE_IS_IN_ENV
357 	struct udevice *vdev;
358 # ifndef CONFIG_DM_KEYBOARD
359 	int ret;
360 # endif
361 
362 	for (ret = uclass_first_device(UCLASS_VIDEO, &vdev);
363 	     vdev;
364 	     ret = uclass_next_device(&vdev))
365 		;
366 	if (ret)
367 		printf("%s: Video device failed (ret=%d)\n", __func__, ret);
368 #endif /* !CONFIG_SYS_CONSOLE_IS_IN_ENV */
369 #else
370 # if defined(CONFIG_LCD)
371 	drv_lcd_init ();
372 # endif
373 # if defined(CONFIG_VIDEO) || defined(CONFIG_CFB_CONSOLE)
374 	drv_video_init ();
375 # endif
376 #endif /* CONFIG_DM_VIDEO */
377 #if defined(CONFIG_KEYBOARD) && !defined(CONFIG_DM_KEYBOARD)
378 	drv_keyboard_init ();
379 #endif
380 	drv_system_init ();
381 	serial_stdio_init ();
382 #ifdef CONFIG_USB_TTY
383 	drv_usbtty_init ();
384 #endif
385 #ifdef CONFIG_NETCONSOLE
386 	drv_nc_init ();
387 #endif
388 #ifdef CONFIG_JTAG_CONSOLE
389 	drv_jtag_console_init ();
390 #endif
391 #ifdef CONFIG_CBMEM_CONSOLE
392 	cbmemc_init();
393 #endif
394 
395 	return 0;
396 }
397 
398 int stdio_init(void)
399 {
400 	stdio_init_tables();
401 	stdio_add_devices();
402 
403 	return 0;
404 }
405