3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * SPDX-License-Identifier: GPL-2.0+
9 #include <environment.h>
11 #include <stdio_dev.h>
13 #include <linux/compiler.h>
16 DECLARE_GLOBAL_DATA_PTR;
18 static struct serial_device *serial_devices;
19 static struct serial_device *serial_current;
21 * Table with supported baudrates (defined in config_xyz.h)
23 static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
26 * serial_null() - Void registration routine of a serial driver
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
33 static void serial_null(void)
38 * on_baudrate() - Update the actual baudrate when the env var changes
40 * This will check for a valid baudrate and only apply it if valid.
42 static int on_baudrate(const char *name, const char *value, enum env_op op,
50 case env_op_overwrite:
52 * Switch to new baudrate if new baudrate is supported
54 baudrate = simple_strtoul(value, NULL, 10);
56 /* Not actually changing */
57 if (gd->baudrate == baudrate)
60 for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) {
61 if (baudrate == baudrate_table[i])
64 if (i == ARRAY_SIZE(baudrate_table)) {
65 if ((flags & H_FORCE) == 0)
66 printf("## Baudrate %d bps not supported\n",
70 if ((flags & H_INTERACTIVE) != 0) {
71 printf("## Switch baudrate to %d"
72 " bps and press ENTER ...\n", baudrate);
76 gd->baudrate = baudrate;
82 if ((flags & H_INTERACTIVE) != 0)
90 printf("## Baudrate may not be deleted\n");
96 U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
99 * serial_initfunc() - Forward declare of driver registration routine
100 * @name: Name of the real driver registration routine.
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.
108 #define serial_initfunc(name) \
110 __attribute__((weak, alias("serial_null")));
112 serial_initfunc(amirix_serial_initialize);
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);
120 serial_initfunc(bmw_serial_initialize);
121 serial_initfunc(clps7111_serial_initialize);
122 serial_initfunc(cogent_serial_initialize);
123 serial_initfunc(cpci750_serial_initialize);
124 serial_initfunc(evb64260_serial_initialize);
125 serial_initfunc(imx_serial_initialize);
126 serial_initfunc(iop480_serial_initialize);
127 serial_initfunc(jz_serial_initialize);
128 serial_initfunc(leon2_serial_initialize);
129 serial_initfunc(leon3_serial_initialize);
130 serial_initfunc(lh7a40x_serial_initialize);
131 serial_initfunc(lpc32xx_serial_initialize);
132 serial_initfunc(marvell_serial_initialize);
133 serial_initfunc(max3100_serial_initialize);
134 serial_initfunc(mcf_serial_initialize);
135 serial_initfunc(ml2_serial_initialize);
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);
141 serial_initfunc(mxc_serial_initialize);
142 serial_initfunc(mxs_auart_initialize);
143 serial_initfunc(ns16550_serial_initialize);
144 serial_initfunc(oc_serial_initialize);
145 serial_initfunc(p3mx_serial_initialize);
146 serial_initfunc(pl01x_serial_initialize);
147 serial_initfunc(pxa_serial_initialize);
148 serial_initfunc(s3c24xx_serial_initialize);
149 serial_initfunc(s5p_serial_initialize);
150 serial_initfunc(sa1100_serial_initialize);
151 serial_initfunc(sandbox_serial_initialize);
152 serial_initfunc(sconsole_serial_initialize);
153 serial_initfunc(sh_serial_initialize);
154 serial_initfunc(stm32_serial_initialize);
155 serial_initfunc(uartlite_serial_initialize);
156 serial_initfunc(zynq_serial_initialize);
159 * serial_register() - Register serial driver with serial driver core
160 * @dev: Pointer to the serial driver structure
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
168 void serial_register(struct serial_device *dev)
170 #ifdef CONFIG_NEEDS_MANUAL_RELOC
172 dev->start += gd->reloc_off;
174 dev->stop += gd->reloc_off;
176 dev->setbrg += gd->reloc_off;
178 dev->getc += gd->reloc_off;
180 dev->tstc += gd->reloc_off;
182 dev->putc += gd->reloc_off;
184 dev->puts += gd->reloc_off;
187 dev->next = serial_devices;
188 serial_devices = dev;
192 * serial_initialize() - Register all compiled-in serial port drivers
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
200 void serial_initialize(void)
202 amirix_serial_initialize();
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();
210 bmw_serial_initialize();
211 clps7111_serial_initialize();
212 cogent_serial_initialize();
213 cpci750_serial_initialize();
214 evb64260_serial_initialize();
215 imx_serial_initialize();
216 iop480_serial_initialize();
217 jz_serial_initialize();
218 leon2_serial_initialize();
219 leon3_serial_initialize();
220 lh7a40x_serial_initialize();
221 lpc32xx_serial_initialize();
222 marvell_serial_initialize();
223 max3100_serial_initialize();
224 mcf_serial_initialize();
225 ml2_serial_initialize();
226 mpc5xx_serial_initialize();
227 mpc8260_scc_serial_initialize();
228 mpc8260_smc_serial_initialize();
229 mpc85xx_serial_initialize();
230 mpc8xx_serial_initialize();
231 mxc_serial_initialize();
232 mxs_auart_initialize();
233 ns16550_serial_initialize();
234 oc_serial_initialize();
235 p3mx_serial_initialize();
236 pl01x_serial_initialize();
237 pxa_serial_initialize();
238 s3c24xx_serial_initialize();
239 s5p_serial_initialize();
240 sa1100_serial_initialize();
241 sandbox_serial_initialize();
242 sconsole_serial_initialize();
243 sh_serial_initialize();
244 stm32_serial_initialize();
245 uartlite_serial_initialize();
246 zynq_serial_initialize();
248 serial_assign(default_serial_console()->name);
251 static int serial_stub_start(struct stdio_dev *sdev)
253 struct serial_device *dev = sdev->priv;
258 static int serial_stub_stop(struct stdio_dev *sdev)
260 struct serial_device *dev = sdev->priv;
265 static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
267 struct serial_device *dev = sdev->priv;
272 static void serial_stub_puts(struct stdio_dev *sdev, const char *str)
274 struct serial_device *dev = sdev->priv;
279 int serial_stub_getc(struct stdio_dev *sdev)
281 struct serial_device *dev = sdev->priv;
286 int serial_stub_tstc(struct stdio_dev *sdev)
288 struct serial_device *dev = sdev->priv;
294 * serial_stdio_init() - Register serial ports with STDIO core
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.
300 void serial_stdio_init(void)
302 struct stdio_dev dev;
303 struct serial_device *s = serial_devices;
306 memset(&dev, 0, sizeof(dev));
308 strcpy(dev.name, s->name);
309 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
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;
319 stdio_register(&dev);
326 * serial_assign() - Select the serial output device by name
327 * @name: Name of the serial driver to be used as default output
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.
335 * Returns 0 on success, negative on error.
337 int serial_assign(const char *name)
339 struct serial_device *s;
341 for (s = serial_devices; s; s = s->next) {
342 if (strcmp(s->name, name))
352 * serial_reinit_all() - Reinitialize all compiled-in serial ports
354 * This function reinitializes all serial ports that are compiled
355 * into U-Boot by calling their serial_start() functions.
357 void serial_reinit_all(void)
359 struct serial_device *s;
361 for (s = serial_devices; s; s = s->next)
366 * get_current() - Return pointer to currently selected serial port
368 * This function returns a pointer to currently selected serial port.
369 * The currently selected serial port is altered by serial_assign()
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
377 * Returns pointer to the currently selected serial port on success,
380 static struct serial_device *get_current(void)
382 struct serial_device *dev;
384 if (!(gd->flags & GD_FLG_RELOC))
385 dev = default_serial_console();
386 else if (!serial_current)
387 dev = default_serial_console();
389 dev = serial_current;
391 /* We must have a console device */
393 #ifdef CONFIG_SPL_BUILD
394 puts("Cannot find console\n");
397 panic("Cannot find console\n");
405 * serial_init() - Initialize currently selected serial port
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.
412 * Returns 0 on success, negative on error.
414 int serial_init(void)
416 gd->flags |= GD_FLG_SERIAL_READY;
417 return get_current()->start();
421 * serial_setbrg() - Configure baud-rate of currently selected serial port
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.
428 * Returns 0 on success, negative on error.
430 void serial_setbrg(void)
432 get_current()->setbrg();
436 * serial_getc() - Read character from currently selected serial port
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
444 * Returns the character on success, negative on error.
446 int serial_getc(void)
448 return get_current()->getc();
452 * serial_tstc() - Test if data is available on currently selected serial port
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
459 * Returns positive if character is available, zero otherwise.
461 int serial_tstc(void)
463 return get_current()->tstc();
467 * serial_putc() - Output character via currently selected serial port
468 * @c: Single character to be output from the serial port.
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.
477 void serial_putc(const char c)
479 get_current()->putc(c);
483 * serial_puts() - Output string via currently selected serial port
484 * @s: Zero-terminated string to be output from the serial port.
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.
495 void serial_puts(const char *s)
497 get_current()->puts(s);
501 * default_serial_puts() - Output string by calling serial_putc() in loop
502 * @s: Zero-terminated string to be output from the serial port.
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().
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 .
512 void default_serial_puts(const char *s)
514 struct serial_device *dev = get_current();
519 #if CONFIG_POST & CONFIG_SYS_POST_UART
520 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
523 * uart_post_test() - Test the currently selected serial port using POST
524 * @flags: POST framework flags
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.
528 * The serial port is first configured into loopback mode and then
529 * characters are sent through it.
531 * Returns 0 on success, value otherwise.
533 /* Mark weak until post/cpu/.../uart.c migrate over */
535 int uart_post_test(int flags)
538 int ret, saved_baud, b;
539 struct serial_device *saved_dev, *s;
541 /* Save current serial state */
543 saved_dev = serial_current;
544 saved_baud = gd->baudrate;
546 for (s = serial_devices; s; s = s->next) {
547 /* If this driver doesn't support loop back, skip it */
551 /* Test the next device */
558 /* Consume anything that happens to be queued */
559 while (serial_tstc())
562 /* Enable loop back */
565 /* Test every available baud rate */
566 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
567 gd->baudrate = bauds[b];
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)
577 for (c = 0x20; c < 0x7f; ++c) {
581 /* Make sure it's the same one */
582 ret = (c != serial_getc());
588 /* Clean up the output in case it was sent */
590 ret = ('\b' != serial_getc());
598 /* Disable loop back */
601 /* XXX: There is no serial_stop() !? */
607 /* Restore previous serial state */
608 serial_current = saved_dev;
609 gd->baudrate = saved_baud;