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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(mpc85xx_serial_initialize); |
137 | serial_initfunc(mpc8xx_serial_initialize); | |
a943472c | 138 | serial_initfunc(mxc_serial_initialize); |
94a255df JH |
139 | serial_initfunc(mxs_auart_initialize); |
140 | serial_initfunc(ns16550_serial_initialize); | |
141 | serial_initfunc(oc_serial_initialize); | |
142 | serial_initfunc(p3mx_serial_initialize); | |
39f61477 | 143 | serial_initfunc(pl01x_serial_initialize); |
94a255df JH |
144 | serial_initfunc(pxa_serial_initialize); |
145 | serial_initfunc(s3c24xx_serial_initialize); | |
146 | serial_initfunc(s5p_serial_initialize); | |
a30a4220 | 147 | serial_initfunc(sa1100_serial_initialize); |
94a255df JH |
148 | serial_initfunc(sandbox_serial_initialize); |
149 | serial_initfunc(sconsole_serial_initialize); | |
8bdd7efa | 150 | serial_initfunc(sh_serial_initialize); |
ab3f0c7d | 151 | serial_initfunc(stm32_serial_initialize); |
94a255df JH |
152 | serial_initfunc(uartlite_serial_initialize); |
153 | serial_initfunc(zynq_serial_initialize); | |
f0eb1f61 | 154 | |
9cd2b9e4 MV |
155 | /** |
156 | * serial_register() - Register serial driver with serial driver core | |
157 | * @dev: Pointer to the serial driver structure | |
158 | * | |
159 | * This function registers the serial driver supplied via @dev with | |
160 | * serial driver core, thus making U-Boot aware of it and making it | |
161 | * available for U-Boot to use. On platforms that still require manual | |
162 | * relocation of constant variables, relocation of the supplied structure | |
163 | * is performed. | |
164 | */ | |
c52b4f79 | 165 | void serial_register(struct serial_device *dev) |
281e00a3 | 166 | { |
2e5167cc | 167 | #ifdef CONFIG_NEEDS_MANUAL_RELOC |
f2760c4a MV |
168 | if (dev->start) |
169 | dev->start += gd->reloc_off; | |
170 | if (dev->stop) | |
171 | dev->stop += gd->reloc_off; | |
172 | if (dev->setbrg) | |
173 | dev->setbrg += gd->reloc_off; | |
174 | if (dev->getc) | |
175 | dev->getc += gd->reloc_off; | |
176 | if (dev->tstc) | |
177 | dev->tstc += gd->reloc_off; | |
178 | if (dev->putc) | |
179 | dev->putc += gd->reloc_off; | |
180 | if (dev->puts) | |
181 | dev->puts += gd->reloc_off; | |
521af04d | 182 | #endif |
281e00a3 WD |
183 | |
184 | dev->next = serial_devices; | |
185 | serial_devices = dev; | |
281e00a3 WD |
186 | } |
187 | ||
9cd2b9e4 MV |
188 | /** |
189 | * serial_initialize() - Register all compiled-in serial port drivers | |
190 | * | |
191 | * This function registers all serial port drivers that are compiled | |
192 | * into the U-Boot binary with the serial core, thus making them | |
193 | * available to U-Boot to use. Lastly, this function assigns a default | |
194 | * serial port to the serial core. That serial port is then used as a | |
195 | * default output. | |
196 | */ | |
a6e6f7f4 | 197 | void serial_initialize(void) |
281e00a3 | 198 | { |
5dee6f55 | 199 | amirix_serial_initialize(); |
94a255df JH |
200 | arc_serial_initialize(); |
201 | arm_dcc_initialize(); | |
202 | asc_serial_initialize(); | |
203 | atmel_serial_initialize(); | |
204 | au1x00_serial_initialize(); | |
205 | bfin_jtag_initialize(); | |
206 | bfin_serial_initialize(); | |
c45a14ad | 207 | bmw_serial_initialize(); |
94a255df | 208 | clps7111_serial_initialize(); |
d25c39d3 | 209 | cogent_serial_initialize(); |
619c90bb | 210 | cpci750_serial_initialize(); |
829b3b2e | 211 | evb64260_serial_initialize(); |
7882e7c1 | 212 | imx_serial_initialize(); |
94a255df JH |
213 | iop480_serial_initialize(); |
214 | jz_serial_initialize(); | |
94a255df JH |
215 | leon2_serial_initialize(); |
216 | leon3_serial_initialize(); | |
1f673b4f | 217 | lh7a40x_serial_initialize(); |
94a255df JH |
218 | lpc32xx_serial_initialize(); |
219 | marvell_serial_initialize(); | |
7cd851a5 | 220 | max3100_serial_initialize(); |
94a255df JH |
221 | mcf_serial_initialize(); |
222 | ml2_serial_initialize(); | |
94a255df JH |
223 | mpc85xx_serial_initialize(); |
224 | mpc8xx_serial_initialize(); | |
a943472c | 225 | mxc_serial_initialize(); |
94a255df JH |
226 | mxs_auart_initialize(); |
227 | ns16550_serial_initialize(); | |
228 | oc_serial_initialize(); | |
229 | p3mx_serial_initialize(); | |
39f61477 | 230 | pl01x_serial_initialize(); |
94a255df JH |
231 | pxa_serial_initialize(); |
232 | s3c24xx_serial_initialize(); | |
233 | s5p_serial_initialize(); | |
a30a4220 | 234 | sa1100_serial_initialize(); |
94a255df JH |
235 | sandbox_serial_initialize(); |
236 | sconsole_serial_initialize(); | |
8bdd7efa | 237 | sh_serial_initialize(); |
ab3f0c7d | 238 | stm32_serial_initialize(); |
94a255df JH |
239 | uartlite_serial_initialize(); |
240 | zynq_serial_initialize(); | |
7b953c51 | 241 | |
a6e6f7f4 | 242 | serial_assign(default_serial_console()->name); |
281e00a3 WD |
243 | } |
244 | ||
654f8d0f | 245 | static int serial_stub_start(struct stdio_dev *sdev) |
709ea543 SG |
246 | { |
247 | struct serial_device *dev = sdev->priv; | |
248 | ||
249 | return dev->start(); | |
250 | } | |
251 | ||
654f8d0f | 252 | static int serial_stub_stop(struct stdio_dev *sdev) |
709ea543 SG |
253 | { |
254 | struct serial_device *dev = sdev->priv; | |
255 | ||
256 | return dev->stop(); | |
257 | } | |
258 | ||
654f8d0f | 259 | static void serial_stub_putc(struct stdio_dev *sdev, const char ch) |
709ea543 SG |
260 | { |
261 | struct serial_device *dev = sdev->priv; | |
262 | ||
263 | dev->putc(ch); | |
264 | } | |
265 | ||
654f8d0f | 266 | static void serial_stub_puts(struct stdio_dev *sdev, const char *str) |
709ea543 SG |
267 | { |
268 | struct serial_device *dev = sdev->priv; | |
269 | ||
270 | dev->puts(str); | |
271 | } | |
272 | ||
49ddcf3e | 273 | static int serial_stub_getc(struct stdio_dev *sdev) |
709ea543 SG |
274 | { |
275 | struct serial_device *dev = sdev->priv; | |
276 | ||
277 | return dev->getc(); | |
278 | } | |
279 | ||
49ddcf3e | 280 | static int serial_stub_tstc(struct stdio_dev *sdev) |
709ea543 SG |
281 | { |
282 | struct serial_device *dev = sdev->priv; | |
283 | ||
284 | return dev->tstc(); | |
285 | } | |
286 | ||
9cd2b9e4 MV |
287 | /** |
288 | * serial_stdio_init() - Register serial ports with STDIO core | |
289 | * | |
290 | * This function generates a proxy driver for each serial port driver. | |
291 | * These proxy drivers then register with the STDIO core, making the | |
292 | * serial drivers available as STDIO devices. | |
293 | */ | |
a6e6f7f4 | 294 | void serial_stdio_init(void) |
281e00a3 | 295 | { |
52cb4d4f | 296 | struct stdio_dev dev; |
281e00a3 WD |
297 | struct serial_device *s = serial_devices; |
298 | ||
2ee66533 | 299 | while (s) { |
a6e6f7f4 | 300 | memset(&dev, 0, sizeof(dev)); |
281e00a3 | 301 | |
a6e6f7f4 | 302 | strcpy(dev.name, s->name); |
281e00a3 WD |
303 | dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT; |
304 | ||
709ea543 SG |
305 | dev.start = serial_stub_start; |
306 | dev.stop = serial_stub_stop; | |
307 | dev.putc = serial_stub_putc; | |
308 | dev.puts = serial_stub_puts; | |
309 | dev.getc = serial_stub_getc; | |
310 | dev.tstc = serial_stub_tstc; | |
addf9513 | 311 | dev.priv = s; |
281e00a3 | 312 | |
a6e6f7f4 | 313 | stdio_register(&dev); |
281e00a3 WD |
314 | |
315 | s = s->next; | |
316 | } | |
317 | } | |
318 | ||
9cd2b9e4 MV |
319 | /** |
320 | * serial_assign() - Select the serial output device by name | |
321 | * @name: Name of the serial driver to be used as default output | |
322 | * | |
323 | * This function configures the serial output multiplexing by | |
324 | * selecting which serial device will be used as default. In case | |
325 | * the STDIO "serial" device is selected as stdin/stdout/stderr, | |
326 | * the serial device previously configured by this function will be | |
327 | * used for the particular operation. | |
328 | * | |
329 | * Returns 0 on success, negative on error. | |
330 | */ | |
7813ca9b | 331 | int serial_assign(const char *name) |
281e00a3 WD |
332 | { |
333 | struct serial_device *s; | |
334 | ||
2ee66533 | 335 | for (s = serial_devices; s; s = s->next) { |
6d93e258 MV |
336 | if (strcmp(s->name, name)) |
337 | continue; | |
338 | serial_current = s; | |
339 | return 0; | |
281e00a3 WD |
340 | } |
341 | ||
6d93e258 | 342 | return -EINVAL; |
281e00a3 WD |
343 | } |
344 | ||
9cd2b9e4 MV |
345 | /** |
346 | * serial_reinit_all() - Reinitialize all compiled-in serial ports | |
347 | * | |
348 | * This function reinitializes all serial ports that are compiled | |
349 | * into U-Boot by calling their serial_start() functions. | |
350 | */ | |
a6e6f7f4 | 351 | void serial_reinit_all(void) |
281e00a3 WD |
352 | { |
353 | struct serial_device *s; | |
354 | ||
a6e6f7f4 | 355 | for (s = serial_devices; s; s = s->next) |
89143fb3 | 356 | s->start(); |
281e00a3 WD |
357 | } |
358 | ||
9cd2b9e4 MV |
359 | /** |
360 | * get_current() - Return pointer to currently selected serial port | |
361 | * | |
362 | * This function returns a pointer to currently selected serial port. | |
363 | * The currently selected serial port is altered by serial_assign() | |
364 | * function. | |
365 | * | |
366 | * In case this function is called before relocation or before any serial | |
367 | * port is configured, this function calls default_serial_console() to | |
368 | * determine the serial port. Otherwise, the configured serial port is | |
369 | * returned. | |
370 | * | |
371 | * Returns pointer to the currently selected serial port on success, | |
372 | * NULL on error. | |
373 | */ | |
857c283e | 374 | static struct serial_device *get_current(void) |
281e00a3 | 375 | { |
857c283e | 376 | struct serial_device *dev; |
2ee66533 | 377 | |
dee19416 | 378 | if (!(gd->flags & GD_FLG_RELOC)) |
857c283e | 379 | dev = default_serial_console(); |
dee19416 MV |
380 | else if (!serial_current) |
381 | dev = default_serial_console(); | |
382 | else | |
383 | dev = serial_current; | |
857c283e | 384 | |
dee19416 MV |
385 | /* We must have a console device */ |
386 | if (!dev) { | |
f1f1e9cb | 387 | #ifdef CONFIG_SPL_BUILD |
dee19416 MV |
388 | puts("Cannot find console\n"); |
389 | hang(); | |
f1f1e9cb | 390 | #else |
dee19416 | 391 | panic("Cannot find console\n"); |
f1f1e9cb | 392 | #endif |
dee19416 MV |
393 | } |
394 | ||
857c283e SG |
395 | return dev; |
396 | } | |
281e00a3 | 397 | |
9cd2b9e4 MV |
398 | /** |
399 | * serial_init() - Initialize currently selected serial port | |
400 | * | |
401 | * This function initializes the currently selected serial port. This | |
402 | * usually involves setting up the registers of that particular port, | |
403 | * enabling clock and such. This function uses the get_current() call | |
404 | * to determine which port is selected. | |
405 | * | |
406 | * Returns 0 on success, negative on error. | |
407 | */ | |
857c283e SG |
408 | int serial_init(void) |
409 | { | |
093f79ab | 410 | gd->flags |= GD_FLG_SERIAL_READY; |
89143fb3 | 411 | return get_current()->start(); |
281e00a3 WD |
412 | } |
413 | ||
9cd2b9e4 MV |
414 | /** |
415 | * serial_setbrg() - Configure baud-rate of currently selected serial port | |
416 | * | |
417 | * This function configures the baud-rate of the currently selected | |
418 | * serial port. The baud-rate is retrieved from global data within | |
419 | * the serial port driver. This function uses the get_current() call | |
420 | * to determine which port is selected. | |
421 | * | |
422 | * Returns 0 on success, negative on error. | |
423 | */ | |
a6e6f7f4 | 424 | void serial_setbrg(void) |
281e00a3 | 425 | { |
857c283e | 426 | get_current()->setbrg(); |
281e00a3 WD |
427 | } |
428 | ||
9cd2b9e4 MV |
429 | /** |
430 | * serial_getc() - Read character from currently selected serial port | |
431 | * | |
432 | * This function retrieves a character from currently selected serial | |
433 | * port. In case there is no character waiting on the serial port, | |
434 | * this function will block and wait for the character to appear. This | |
435 | * function uses the get_current() call to determine which port is | |
436 | * selected. | |
437 | * | |
438 | * Returns the character on success, negative on error. | |
439 | */ | |
a6e6f7f4 | 440 | int serial_getc(void) |
281e00a3 | 441 | { |
857c283e | 442 | return get_current()->getc(); |
281e00a3 WD |
443 | } |
444 | ||
9cd2b9e4 MV |
445 | /** |
446 | * serial_tstc() - Test if data is available on currently selected serial port | |
447 | * | |
448 | * This function tests if one or more characters are available on | |
449 | * currently selected serial port. This function never blocks. This | |
450 | * function uses the get_current() call to determine which port is | |
451 | * selected. | |
452 | * | |
453 | * Returns positive if character is available, zero otherwise. | |
454 | */ | |
a6e6f7f4 | 455 | int serial_tstc(void) |
281e00a3 | 456 | { |
857c283e | 457 | return get_current()->tstc(); |
281e00a3 WD |
458 | } |
459 | ||
9cd2b9e4 MV |
460 | /** |
461 | * serial_putc() - Output character via currently selected serial port | |
462 | * @c: Single character to be output from the serial port. | |
463 | * | |
464 | * This function outputs a character via currently selected serial | |
465 | * port. This character is passed to the serial port driver responsible | |
466 | * for controlling the hardware. The hardware may still be in process | |
467 | * of transmitting another character, therefore this function may block | |
468 | * for a short amount of time. This function uses the get_current() | |
469 | * call to determine which port is selected. | |
470 | */ | |
a6e6f7f4 | 471 | void serial_putc(const char c) |
281e00a3 | 472 | { |
857c283e | 473 | get_current()->putc(c); |
281e00a3 WD |
474 | } |
475 | ||
9cd2b9e4 MV |
476 | /** |
477 | * serial_puts() - Output string via currently selected serial port | |
478 | * @s: Zero-terminated string to be output from the serial port. | |
479 | * | |
480 | * This function outputs a zero-terminated string via currently | |
481 | * selected serial port. This function behaves as an accelerator | |
482 | * in case the hardware can queue multiple characters for transfer. | |
483 | * The whole string that is to be output is available to the function | |
484 | * implementing the hardware manipulation. Transmitting the whole | |
485 | * string may take some time, thus this function may block for some | |
486 | * amount of time. This function uses the get_current() call to | |
487 | * determine which port is selected. | |
488 | */ | |
a6e6f7f4 | 489 | void serial_puts(const char *s) |
281e00a3 | 490 | { |
857c283e | 491 | get_current()->puts(s); |
281e00a3 | 492 | } |
7b826c2f | 493 | |
9cd2b9e4 MV |
494 | /** |
495 | * default_serial_puts() - Output string by calling serial_putc() in loop | |
496 | * @s: Zero-terminated string to be output from the serial port. | |
497 | * | |
498 | * This function outputs a zero-terminated string by calling serial_putc() | |
499 | * in a loop. Most drivers do not support queueing more than one byte for | |
500 | * transfer, thus this function precisely implements their serial_puts(). | |
501 | * | |
502 | * To optimize the number of get_current() calls, this function only | |
503 | * calls get_current() once and then directly accesses the putc() call | |
504 | * of the &struct serial_device . | |
505 | */ | |
bfb7d7a3 MV |
506 | void default_serial_puts(const char *s) |
507 | { | |
508 | struct serial_device *dev = get_current(); | |
509 | while (*s) | |
510 | dev->putc(*s++); | |
511 | } | |
512 | ||
7b826c2f MF |
513 | #if CONFIG_POST & CONFIG_SYS_POST_UART |
514 | static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE; | |
515 | ||
9cd2b9e4 MV |
516 | /** |
517 | * uart_post_test() - Test the currently selected serial port using POST | |
518 | * @flags: POST framework flags | |
519 | * | |
520 | * Do a loopback test of the currently selected serial port. This | |
521 | * function is only useful in the context of the POST testing framwork. | |
1b25e586 | 522 | * The serial port is first configured into loopback mode and then |
9cd2b9e4 MV |
523 | * characters are sent through it. |
524 | * | |
525 | * Returns 0 on success, value otherwise. | |
526 | */ | |
7b826c2f MF |
527 | /* Mark weak until post/cpu/.../uart.c migrate over */ |
528 | __weak | |
529 | int uart_post_test(int flags) | |
530 | { | |
531 | unsigned char c; | |
532 | int ret, saved_baud, b; | |
533 | struct serial_device *saved_dev, *s; | |
7b826c2f MF |
534 | |
535 | /* Save current serial state */ | |
536 | ret = 0; | |
537 | saved_dev = serial_current; | |
8e261575 | 538 | saved_baud = gd->baudrate; |
7b826c2f MF |
539 | |
540 | for (s = serial_devices; s; s = s->next) { | |
541 | /* If this driver doesn't support loop back, skip it */ | |
542 | if (!s->loop) | |
543 | continue; | |
544 | ||
545 | /* Test the next device */ | |
546 | serial_current = s; | |
547 | ||
548 | ret = serial_init(); | |
549 | if (ret) | |
550 | goto done; | |
551 | ||
552 | /* Consume anything that happens to be queued */ | |
553 | while (serial_tstc()) | |
554 | serial_getc(); | |
555 | ||
556 | /* Enable loop back */ | |
557 | s->loop(1); | |
558 | ||
559 | /* Test every available baud rate */ | |
560 | for (b = 0; b < ARRAY_SIZE(bauds); ++b) { | |
8e261575 | 561 | gd->baudrate = bauds[b]; |
7b826c2f MF |
562 | serial_setbrg(); |
563 | ||
564 | /* | |
565 | * Stick to printable chars to avoid issues: | |
566 | * - terminal corruption | |
567 | * - serial program reacting to sequences and sending | |
568 | * back random extra data | |
569 | * - most serial drivers add in extra chars (like \r\n) | |
570 | */ | |
571 | for (c = 0x20; c < 0x7f; ++c) { | |
572 | /* Send it out */ | |
573 | serial_putc(c); | |
574 | ||
575 | /* Make sure it's the same one */ | |
576 | ret = (c != serial_getc()); | |
577 | if (ret) { | |
578 | s->loop(0); | |
579 | goto done; | |
580 | } | |
581 | ||
582 | /* Clean up the output in case it was sent */ | |
583 | serial_putc('\b'); | |
584 | ret = ('\b' != serial_getc()); | |
585 | if (ret) { | |
586 | s->loop(0); | |
587 | goto done; | |
588 | } | |
589 | } | |
590 | } | |
591 | ||
592 | /* Disable loop back */ | |
593 | s->loop(0); | |
594 | ||
89143fb3 MV |
595 | /* XXX: There is no serial_stop() !? */ |
596 | if (s->stop) | |
597 | s->stop(); | |
7b826c2f MF |
598 | } |
599 | ||
600 | done: | |
601 | /* Restore previous serial state */ | |
602 | serial_current = saved_dev; | |
8e261575 | 603 | gd->baudrate = saved_baud; |
7b826c2f MF |
604 | serial_reinit_all(); |
605 | serial_setbrg(); | |
606 | ||
607 | return ret; | |
608 | } | |
609 | #endif |