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Commit | Line | Data |
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281e00a3 WD |
1 | /* |
2 | * (C) Copyright 2004 | |
3 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
4 | * | |
1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
281e00a3 WD |
6 | */ |
7 | ||
8 | #include <common.h> | |
32057717 | 9 | #include <environment.h> |
281e00a3 | 10 | #include <serial.h> |
52cb4d4f | 11 | #include <stdio_dev.h> |
7b826c2f MF |
12 | #include <post.h> |
13 | #include <linux/compiler.h> | |
6d93e258 | 14 | #include <errno.h> |
281e00a3 | 15 | |
d87080b7 WD |
16 | DECLARE_GLOBAL_DATA_PTR; |
17 | ||
a6e6f7f4 GF |
18 | static struct serial_device *serial_devices; |
19 | static struct serial_device *serial_current; | |
32057717 JH |
20 | /* |
21 | * Table with supported baudrates (defined in config_xyz.h) | |
22 | */ | |
23 | static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE; | |
281e00a3 | 24 | |
9cd2b9e4 MV |
25 | /** |
26 | * serial_null() - Void registration routine of a serial driver | |
27 | * | |
28 | * This routine implements a void registration routine of a serial | |
29 | * driver. The registration routine of a particular driver is aliased | |
30 | * to this empty function in case the driver is not compiled into | |
31 | * U-Boot. | |
32 | */ | |
2a333aeb MV |
33 | static void serial_null(void) |
34 | { | |
35 | } | |
36 | ||
32057717 JH |
37 | /** |
38 | * on_baudrate() - Update the actual baudrate when the env var changes | |
39 | * | |
40 | * This will check for a valid baudrate and only apply it if valid. | |
41 | */ | |
42 | static int on_baudrate(const char *name, const char *value, enum env_op op, | |
43 | int flags) | |
44 | { | |
45 | int i; | |
46 | int baudrate; | |
47 | ||
48 | switch (op) { | |
49 | case env_op_create: | |
50 | case env_op_overwrite: | |
51 | /* | |
52 | * Switch to new baudrate if new baudrate is supported | |
53 | */ | |
54 | baudrate = simple_strtoul(value, NULL, 10); | |
55 | ||
56 | /* Not actually changing */ | |
57 | if (gd->baudrate == baudrate) | |
58 | return 0; | |
59 | ||
9935175f | 60 | for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) { |
32057717 JH |
61 | if (baudrate == baudrate_table[i]) |
62 | break; | |
63 | } | |
9935175f | 64 | if (i == ARRAY_SIZE(baudrate_table)) { |
32057717 JH |
65 | if ((flags & H_FORCE) == 0) |
66 | printf("## Baudrate %d bps not supported\n", | |
67 | baudrate); | |
68 | return 1; | |
69 | } | |
70 | if ((flags & H_INTERACTIVE) != 0) { | |
71 | printf("## Switch baudrate to %d" | |
72 | " bps and press ENTER ...\n", baudrate); | |
73 | udelay(50000); | |
74 | } | |
75 | ||
76 | gd->baudrate = baudrate; | |
32057717 JH |
77 | |
78 | serial_setbrg(); | |
79 | ||
80 | udelay(50000); | |
81 | ||
82 | if ((flags & H_INTERACTIVE) != 0) | |
83 | while (1) { | |
84 | if (getc() == '\r') | |
85 | break; | |
86 | } | |
87 | ||
88 | return 0; | |
89 | case env_op_delete: | |
90 | printf("## Baudrate may not be deleted\n"); | |
91 | return 1; | |
92 | default: | |
93 | return 0; | |
94 | } | |
95 | } | |
96 | U_BOOT_ENV_CALLBACK(baudrate, on_baudrate); | |
97 | ||
9cd2b9e4 MV |
98 | /** |
99 | * serial_initfunc() - Forward declare of driver registration routine | |
100 | * @name: Name of the real driver registration routine. | |
101 | * | |
102 | * This macro expands onto forward declaration of a driver registration | |
103 | * routine, which is then used below in serial_initialize() function. | |
104 | * The declaration is made weak and aliases to serial_null() so in case | |
105 | * the driver is not compiled in, the function is still declared and can | |
106 | * be used, but aliases to serial_null() and thus is optimized away. | |
107 | */ | |
2a333aeb MV |
108 | #define serial_initfunc(name) \ |
109 | void name(void) \ | |
110 | __attribute__((weak, alias("serial_null"))); | |
111 | ||
5dee6f55 | 112 | serial_initfunc(amirix_serial_initialize); |
94a255df JH |
113 | serial_initfunc(arc_serial_initialize); |
114 | serial_initfunc(arm_dcc_initialize); | |
115 | serial_initfunc(asc_serial_initialize); | |
116 | serial_initfunc(atmel_serial_initialize); | |
117 | serial_initfunc(au1x00_serial_initialize); | |
118 | serial_initfunc(bfin_jtag_initialize); | |
119 | serial_initfunc(bfin_serial_initialize); | |
c45a14ad | 120 | serial_initfunc(bmw_serial_initialize); |
94a255df | 121 | serial_initfunc(clps7111_serial_initialize); |
d25c39d3 | 122 | serial_initfunc(cogent_serial_initialize); |
619c90bb | 123 | serial_initfunc(cpci750_serial_initialize); |
829b3b2e | 124 | serial_initfunc(evb64260_serial_initialize); |
7882e7c1 | 125 | serial_initfunc(imx_serial_initialize); |
94a255df JH |
126 | serial_initfunc(iop480_serial_initialize); |
127 | serial_initfunc(jz_serial_initialize); | |
94a255df JH |
128 | serial_initfunc(leon2_serial_initialize); |
129 | serial_initfunc(leon3_serial_initialize); | |
1f673b4f | 130 | serial_initfunc(lh7a40x_serial_initialize); |
94a255df JH |
131 | serial_initfunc(lpc32xx_serial_initialize); |
132 | serial_initfunc(marvell_serial_initialize); | |
7cd851a5 | 133 | serial_initfunc(max3100_serial_initialize); |
94a255df JH |
134 | serial_initfunc(mcf_serial_initialize); |
135 | serial_initfunc(ml2_serial_initialize); | |
94a255df JH |
136 | serial_initfunc(mpc5xx_serial_initialize); |
137 | serial_initfunc(mpc8260_scc_serial_initialize); | |
138 | serial_initfunc(mpc8260_smc_serial_initialize); | |
139 | serial_initfunc(mpc85xx_serial_initialize); | |
140 | serial_initfunc(mpc8xx_serial_initialize); | |
a943472c | 141 | serial_initfunc(mxc_serial_initialize); |
94a255df JH |
142 | serial_initfunc(mxs_auart_initialize); |
143 | serial_initfunc(ns16550_serial_initialize); | |
144 | serial_initfunc(oc_serial_initialize); | |
145 | serial_initfunc(p3mx_serial_initialize); | |
39f61477 | 146 | serial_initfunc(pl01x_serial_initialize); |
94a255df JH |
147 | serial_initfunc(pxa_serial_initialize); |
148 | serial_initfunc(s3c24xx_serial_initialize); | |
149 | serial_initfunc(s5p_serial_initialize); | |
a30a4220 | 150 | serial_initfunc(sa1100_serial_initialize); |
94a255df JH |
151 | serial_initfunc(sandbox_serial_initialize); |
152 | serial_initfunc(sconsole_serial_initialize); | |
8bdd7efa | 153 | serial_initfunc(sh_serial_initialize); |
ab3f0c7d | 154 | serial_initfunc(stm32_serial_initialize); |
94a255df JH |
155 | serial_initfunc(uartlite_serial_initialize); |
156 | serial_initfunc(zynq_serial_initialize); | |
f0eb1f61 | 157 | |
9cd2b9e4 MV |
158 | /** |
159 | * serial_register() - Register serial driver with serial driver core | |
160 | * @dev: Pointer to the serial driver structure | |
161 | * | |
162 | * This function registers the serial driver supplied via @dev with | |
163 | * serial driver core, thus making U-Boot aware of it and making it | |
164 | * available for U-Boot to use. On platforms that still require manual | |
165 | * relocation of constant variables, relocation of the supplied structure | |
166 | * is performed. | |
167 | */ | |
c52b4f79 | 168 | void serial_register(struct serial_device *dev) |
281e00a3 | 169 | { |
2e5167cc | 170 | #ifdef CONFIG_NEEDS_MANUAL_RELOC |
f2760c4a MV |
171 | if (dev->start) |
172 | dev->start += gd->reloc_off; | |
173 | if (dev->stop) | |
174 | dev->stop += gd->reloc_off; | |
175 | if (dev->setbrg) | |
176 | dev->setbrg += gd->reloc_off; | |
177 | if (dev->getc) | |
178 | dev->getc += gd->reloc_off; | |
179 | if (dev->tstc) | |
180 | dev->tstc += gd->reloc_off; | |
181 | if (dev->putc) | |
182 | dev->putc += gd->reloc_off; | |
183 | if (dev->puts) | |
184 | dev->puts += gd->reloc_off; | |
521af04d | 185 | #endif |
281e00a3 WD |
186 | |
187 | dev->next = serial_devices; | |
188 | serial_devices = dev; | |
281e00a3 WD |
189 | } |
190 | ||
9cd2b9e4 MV |
191 | /** |
192 | * serial_initialize() - Register all compiled-in serial port drivers | |
193 | * | |
194 | * This function registers all serial port drivers that are compiled | |
195 | * into the U-Boot binary with the serial core, thus making them | |
196 | * available to U-Boot to use. Lastly, this function assigns a default | |
197 | * serial port to the serial core. That serial port is then used as a | |
198 | * default output. | |
199 | */ | |
a6e6f7f4 | 200 | void serial_initialize(void) |
281e00a3 | 201 | { |
5dee6f55 | 202 | amirix_serial_initialize(); |
94a255df JH |
203 | arc_serial_initialize(); |
204 | arm_dcc_initialize(); | |
205 | asc_serial_initialize(); | |
206 | atmel_serial_initialize(); | |
207 | au1x00_serial_initialize(); | |
208 | bfin_jtag_initialize(); | |
209 | bfin_serial_initialize(); | |
c45a14ad | 210 | bmw_serial_initialize(); |
94a255df | 211 | clps7111_serial_initialize(); |
d25c39d3 | 212 | cogent_serial_initialize(); |
619c90bb | 213 | cpci750_serial_initialize(); |
829b3b2e | 214 | evb64260_serial_initialize(); |
7882e7c1 | 215 | imx_serial_initialize(); |
94a255df JH |
216 | iop480_serial_initialize(); |
217 | jz_serial_initialize(); | |
94a255df JH |
218 | leon2_serial_initialize(); |
219 | leon3_serial_initialize(); | |
1f673b4f | 220 | lh7a40x_serial_initialize(); |
94a255df JH |
221 | lpc32xx_serial_initialize(); |
222 | marvell_serial_initialize(); | |
7cd851a5 | 223 | max3100_serial_initialize(); |
94a255df JH |
224 | mcf_serial_initialize(); |
225 | ml2_serial_initialize(); | |
94a255df JH |
226 | mpc5xx_serial_initialize(); |
227 | mpc8260_scc_serial_initialize(); | |
228 | mpc8260_smc_serial_initialize(); | |
229 | mpc85xx_serial_initialize(); | |
230 | mpc8xx_serial_initialize(); | |
a943472c | 231 | mxc_serial_initialize(); |
94a255df JH |
232 | mxs_auart_initialize(); |
233 | ns16550_serial_initialize(); | |
234 | oc_serial_initialize(); | |
235 | p3mx_serial_initialize(); | |
39f61477 | 236 | pl01x_serial_initialize(); |
94a255df JH |
237 | pxa_serial_initialize(); |
238 | s3c24xx_serial_initialize(); | |
239 | s5p_serial_initialize(); | |
a30a4220 | 240 | sa1100_serial_initialize(); |
94a255df JH |
241 | sandbox_serial_initialize(); |
242 | sconsole_serial_initialize(); | |
8bdd7efa | 243 | sh_serial_initialize(); |
ab3f0c7d | 244 | stm32_serial_initialize(); |
94a255df JH |
245 | uartlite_serial_initialize(); |
246 | zynq_serial_initialize(); | |
7b953c51 | 247 | |
a6e6f7f4 | 248 | serial_assign(default_serial_console()->name); |
281e00a3 WD |
249 | } |
250 | ||
654f8d0f | 251 | static int serial_stub_start(struct stdio_dev *sdev) |
709ea543 SG |
252 | { |
253 | struct serial_device *dev = sdev->priv; | |
254 | ||
255 | return dev->start(); | |
256 | } | |
257 | ||
654f8d0f | 258 | static int serial_stub_stop(struct stdio_dev *sdev) |
709ea543 SG |
259 | { |
260 | struct serial_device *dev = sdev->priv; | |
261 | ||
262 | return dev->stop(); | |
263 | } | |
264 | ||
654f8d0f | 265 | static void serial_stub_putc(struct stdio_dev *sdev, const char ch) |
709ea543 SG |
266 | { |
267 | struct serial_device *dev = sdev->priv; | |
268 | ||
269 | dev->putc(ch); | |
270 | } | |
271 | ||
654f8d0f | 272 | static void serial_stub_puts(struct stdio_dev *sdev, const char *str) |
709ea543 SG |
273 | { |
274 | struct serial_device *dev = sdev->priv; | |
275 | ||
276 | dev->puts(str); | |
277 | } | |
278 | ||
279 | int serial_stub_getc(struct stdio_dev *sdev) | |
280 | { | |
281 | struct serial_device *dev = sdev->priv; | |
282 | ||
283 | return dev->getc(); | |
284 | } | |
285 | ||
286 | int serial_stub_tstc(struct stdio_dev *sdev) | |
287 | { | |
288 | struct serial_device *dev = sdev->priv; | |
289 | ||
290 | return dev->tstc(); | |
291 | } | |
292 | ||
9cd2b9e4 MV |
293 | /** |
294 | * serial_stdio_init() - Register serial ports with STDIO core | |
295 | * | |
296 | * This function generates a proxy driver for each serial port driver. | |
297 | * These proxy drivers then register with the STDIO core, making the | |
298 | * serial drivers available as STDIO devices. | |
299 | */ | |
a6e6f7f4 | 300 | void serial_stdio_init(void) |
281e00a3 | 301 | { |
52cb4d4f | 302 | struct stdio_dev dev; |
281e00a3 WD |
303 | struct serial_device *s = serial_devices; |
304 | ||
2ee66533 | 305 | while (s) { |
a6e6f7f4 | 306 | memset(&dev, 0, sizeof(dev)); |
281e00a3 | 307 | |
a6e6f7f4 | 308 | strcpy(dev.name, s->name); |
281e00a3 WD |
309 | dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; |
310 | ||
709ea543 SG |
311 | dev.start = serial_stub_start; |
312 | dev.stop = serial_stub_stop; | |
313 | dev.putc = serial_stub_putc; | |
314 | dev.puts = serial_stub_puts; | |
315 | dev.getc = serial_stub_getc; | |
316 | dev.tstc = serial_stub_tstc; | |
addf9513 | 317 | dev.priv = s; |
281e00a3 | 318 | |
a6e6f7f4 | 319 | stdio_register(&dev); |
281e00a3 WD |
320 | |
321 | s = s->next; | |
322 | } | |
323 | } | |
324 | ||
9cd2b9e4 MV |
325 | /** |
326 | * serial_assign() - Select the serial output device by name | |
327 | * @name: Name of the serial driver to be used as default output | |
328 | * | |
329 | * This function configures the serial output multiplexing by | |
330 | * selecting which serial device will be used as default. In case | |
331 | * the STDIO "serial" device is selected as stdin/stdout/stderr, | |
332 | * the serial device previously configured by this function will be | |
333 | * used for the particular operation. | |
334 | * | |
335 | * Returns 0 on success, negative on error. | |
336 | */ | |
7813ca9b | 337 | int serial_assign(const char *name) |
281e00a3 WD |
338 | { |
339 | struct serial_device *s; | |
340 | ||
2ee66533 | 341 | for (s = serial_devices; s; s = s->next) { |
6d93e258 MV |
342 | if (strcmp(s->name, name)) |
343 | continue; | |
344 | serial_current = s; | |
345 | return 0; | |
281e00a3 WD |
346 | } |
347 | ||
6d93e258 | 348 | return -EINVAL; |
281e00a3 WD |
349 | } |
350 | ||
9cd2b9e4 MV |
351 | /** |
352 | * serial_reinit_all() - Reinitialize all compiled-in serial ports | |
353 | * | |
354 | * This function reinitializes all serial ports that are compiled | |
355 | * into U-Boot by calling their serial_start() functions. | |
356 | */ | |
a6e6f7f4 | 357 | void serial_reinit_all(void) |
281e00a3 WD |
358 | { |
359 | struct serial_device *s; | |
360 | ||
a6e6f7f4 | 361 | for (s = serial_devices; s; s = s->next) |
89143fb3 | 362 | s->start(); |
281e00a3 WD |
363 | } |
364 | ||
9cd2b9e4 MV |
365 | /** |
366 | * get_current() - Return pointer to currently selected serial port | |
367 | * | |
368 | * This function returns a pointer to currently selected serial port. | |
369 | * The currently selected serial port is altered by serial_assign() | |
370 | * function. | |
371 | * | |
372 | * In case this function is called before relocation or before any serial | |
373 | * port is configured, this function calls default_serial_console() to | |
374 | * determine the serial port. Otherwise, the configured serial port is | |
375 | * returned. | |
376 | * | |
377 | * Returns pointer to the currently selected serial port on success, | |
378 | * NULL on error. | |
379 | */ | |
857c283e | 380 | static struct serial_device *get_current(void) |
281e00a3 | 381 | { |
857c283e | 382 | struct serial_device *dev; |
2ee66533 | 383 | |
dee19416 | 384 | if (!(gd->flags & GD_FLG_RELOC)) |
857c283e | 385 | dev = default_serial_console(); |
dee19416 MV |
386 | else if (!serial_current) |
387 | dev = default_serial_console(); | |
388 | else | |
389 | dev = serial_current; | |
857c283e | 390 | |
dee19416 MV |
391 | /* We must have a console device */ |
392 | if (!dev) { | |
f1f1e9cb | 393 | #ifdef CONFIG_SPL_BUILD |
dee19416 MV |
394 | puts("Cannot find console\n"); |
395 | hang(); | |
f1f1e9cb | 396 | #else |
dee19416 | 397 | panic("Cannot find console\n"); |
f1f1e9cb | 398 | #endif |
dee19416 MV |
399 | } |
400 | ||
857c283e SG |
401 | return dev; |
402 | } | |
281e00a3 | 403 | |
9cd2b9e4 MV |
404 | /** |
405 | * serial_init() - Initialize currently selected serial port | |
406 | * | |
407 | * This function initializes the currently selected serial port. This | |
408 | * usually involves setting up the registers of that particular port, | |
409 | * enabling clock and such. This function uses the get_current() call | |
410 | * to determine which port is selected. | |
411 | * | |
412 | * Returns 0 on success, negative on error. | |
413 | */ | |
857c283e SG |
414 | int serial_init(void) |
415 | { | |
093f79ab | 416 | gd->flags |= GD_FLG_SERIAL_READY; |
89143fb3 | 417 | return get_current()->start(); |
281e00a3 WD |
418 | } |
419 | ||
9cd2b9e4 MV |
420 | /** |
421 | * serial_setbrg() - Configure baud-rate of currently selected serial port | |
422 | * | |
423 | * This function configures the baud-rate of the currently selected | |
424 | * serial port. The baud-rate is retrieved from global data within | |
425 | * the serial port driver. This function uses the get_current() call | |
426 | * to determine which port is selected. | |
427 | * | |
428 | * Returns 0 on success, negative on error. | |
429 | */ | |
a6e6f7f4 | 430 | void serial_setbrg(void) |
281e00a3 | 431 | { |
857c283e | 432 | get_current()->setbrg(); |
281e00a3 WD |
433 | } |
434 | ||
9cd2b9e4 MV |
435 | /** |
436 | * serial_getc() - Read character from currently selected serial port | |
437 | * | |
438 | * This function retrieves a character from currently selected serial | |
439 | * port. In case there is no character waiting on the serial port, | |
440 | * this function will block and wait for the character to appear. This | |
441 | * function uses the get_current() call to determine which port is | |
442 | * selected. | |
443 | * | |
444 | * Returns the character on success, negative on error. | |
445 | */ | |
a6e6f7f4 | 446 | int serial_getc(void) |
281e00a3 | 447 | { |
857c283e | 448 | return get_current()->getc(); |
281e00a3 WD |
449 | } |
450 | ||
9cd2b9e4 MV |
451 | /** |
452 | * serial_tstc() - Test if data is available on currently selected serial port | |
453 | * | |
454 | * This function tests if one or more characters are available on | |
455 | * currently selected serial port. This function never blocks. This | |
456 | * function uses the get_current() call to determine which port is | |
457 | * selected. | |
458 | * | |
459 | * Returns positive if character is available, zero otherwise. | |
460 | */ | |
a6e6f7f4 | 461 | int serial_tstc(void) |
281e00a3 | 462 | { |
857c283e | 463 | return get_current()->tstc(); |
281e00a3 WD |
464 | } |
465 | ||
9cd2b9e4 MV |
466 | /** |
467 | * serial_putc() - Output character via currently selected serial port | |
468 | * @c: Single character to be output from the serial port. | |
469 | * | |
470 | * This function outputs a character via currently selected serial | |
471 | * port. This character is passed to the serial port driver responsible | |
472 | * for controlling the hardware. The hardware may still be in process | |
473 | * of transmitting another character, therefore this function may block | |
474 | * for a short amount of time. This function uses the get_current() | |
475 | * call to determine which port is selected. | |
476 | */ | |
a6e6f7f4 | 477 | void serial_putc(const char c) |
281e00a3 | 478 | { |
857c283e | 479 | get_current()->putc(c); |
281e00a3 WD |
480 | } |
481 | ||
9cd2b9e4 MV |
482 | /** |
483 | * serial_puts() - Output string via currently selected serial port | |
484 | * @s: Zero-terminated string to be output from the serial port. | |
485 | * | |
486 | * This function outputs a zero-terminated string via currently | |
487 | * selected serial port. This function behaves as an accelerator | |
488 | * in case the hardware can queue multiple characters for transfer. | |
489 | * The whole string that is to be output is available to the function | |
490 | * implementing the hardware manipulation. Transmitting the whole | |
491 | * string may take some time, thus this function may block for some | |
492 | * amount of time. This function uses the get_current() call to | |
493 | * determine which port is selected. | |
494 | */ | |
a6e6f7f4 | 495 | void serial_puts(const char *s) |
281e00a3 | 496 | { |
857c283e | 497 | get_current()->puts(s); |
281e00a3 | 498 | } |
7b826c2f | 499 | |
9cd2b9e4 MV |
500 | /** |
501 | * default_serial_puts() - Output string by calling serial_putc() in loop | |
502 | * @s: Zero-terminated string to be output from the serial port. | |
503 | * | |
504 | * This function outputs a zero-terminated string by calling serial_putc() | |
505 | * in a loop. Most drivers do not support queueing more than one byte for | |
506 | * transfer, thus this function precisely implements their serial_puts(). | |
507 | * | |
508 | * To optimize the number of get_current() calls, this function only | |
509 | * calls get_current() once and then directly accesses the putc() call | |
510 | * of the &struct serial_device . | |
511 | */ | |
bfb7d7a3 MV |
512 | void default_serial_puts(const char *s) |
513 | { | |
514 | struct serial_device *dev = get_current(); | |
515 | while (*s) | |
516 | dev->putc(*s++); | |
517 | } | |
518 | ||
7b826c2f MF |
519 | #if CONFIG_POST & CONFIG_SYS_POST_UART |
520 | static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE; | |
521 | ||
9cd2b9e4 MV |
522 | /** |
523 | * uart_post_test() - Test the currently selected serial port using POST | |
524 | * @flags: POST framework flags | |
525 | * | |
526 | * Do a loopback test of the currently selected serial port. This | |
527 | * function is only useful in the context of the POST testing framwork. | |
1b25e586 | 528 | * The serial port is first configured into loopback mode and then |
9cd2b9e4 MV |
529 | * characters are sent through it. |
530 | * | |
531 | * Returns 0 on success, value otherwise. | |
532 | */ | |
7b826c2f MF |
533 | /* Mark weak until post/cpu/.../uart.c migrate over */ |
534 | __weak | |
535 | int uart_post_test(int flags) | |
536 | { | |
537 | unsigned char c; | |
538 | int ret, saved_baud, b; | |
539 | struct serial_device *saved_dev, *s; | |
7b826c2f MF |
540 | |
541 | /* Save current serial state */ | |
542 | ret = 0; | |
543 | saved_dev = serial_current; | |
8e261575 | 544 | saved_baud = gd->baudrate; |
7b826c2f MF |
545 | |
546 | for (s = serial_devices; s; s = s->next) { | |
547 | /* If this driver doesn't support loop back, skip it */ | |
548 | if (!s->loop) | |
549 | continue; | |
550 | ||
551 | /* Test the next device */ | |
552 | serial_current = s; | |
553 | ||
554 | ret = serial_init(); | |
555 | if (ret) | |
556 | goto done; | |
557 | ||
558 | /* Consume anything that happens to be queued */ | |
559 | while (serial_tstc()) | |
560 | serial_getc(); | |
561 | ||
562 | /* Enable loop back */ | |
563 | s->loop(1); | |
564 | ||
565 | /* Test every available baud rate */ | |
566 | for (b = 0; b < ARRAY_SIZE(bauds); ++b) { | |
8e261575 | 567 | gd->baudrate = bauds[b]; |
7b826c2f MF |
568 | serial_setbrg(); |
569 | ||
570 | /* | |
571 | * Stick to printable chars to avoid issues: | |
572 | * - terminal corruption | |
573 | * - serial program reacting to sequences and sending | |
574 | * back random extra data | |
575 | * - most serial drivers add in extra chars (like \r\n) | |
576 | */ | |
577 | for (c = 0x20; c < 0x7f; ++c) { | |
578 | /* Send it out */ | |
579 | serial_putc(c); | |
580 | ||
581 | /* Make sure it's the same one */ | |
582 | ret = (c != serial_getc()); | |
583 | if (ret) { | |
584 | s->loop(0); | |
585 | goto done; | |
586 | } | |
587 | ||
588 | /* Clean up the output in case it was sent */ | |
589 | serial_putc('\b'); | |
590 | ret = ('\b' != serial_getc()); | |
591 | if (ret) { | |
592 | s->loop(0); | |
593 | goto done; | |
594 | } | |
595 | } | |
596 | } | |
597 | ||
598 | /* Disable loop back */ | |
599 | s->loop(0); | |
600 | ||
89143fb3 MV |
601 | /* XXX: There is no serial_stop() !? */ |
602 | if (s->stop) | |
603 | s->stop(); | |
7b826c2f MF |
604 | } |
605 | ||
606 | done: | |
607 | /* Restore previous serial state */ | |
608 | serial_current = saved_dev; | |
8e261575 | 609 | gd->baudrate = saved_baud; |
7b826c2f MF |
610 | serial_reinit_all(); |
611 | serial_setbrg(); | |
612 | ||
613 | return ret; | |
614 | } | |
615 | #endif |