3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 #include <stdio_dev.h>
28 #include <linux/compiler.h>
31 DECLARE_GLOBAL_DATA_PTR;
33 static struct serial_device *serial_devices;
34 static struct serial_device *serial_current;
37 * serial_null() - Void registration routine of a serial driver
39 * This routine implements a void registration routine of a serial
40 * driver. The registration routine of a particular driver is aliased
41 * to this empty function in case the driver is not compiled into
44 static void serial_null(void)
49 * serial_initfunc() - Forward declare of driver registration routine
50 * @name: Name of the real driver registration routine.
52 * This macro expands onto forward declaration of a driver registration
53 * routine, which is then used below in serial_initialize() function.
54 * The declaration is made weak and aliases to serial_null() so in case
55 * the driver is not compiled in, the function is still declared and can
56 * be used, but aliases to serial_null() and thus is optimized away.
58 #define serial_initfunc(name) \
60 __attribute__((weak, alias("serial_null")));
62 serial_initfunc(mpc8xx_serial_initialize);
63 serial_initfunc(ns16550_serial_initialize);
64 serial_initfunc(pxa_serial_initialize);
65 serial_initfunc(s3c24xx_serial_initialize);
66 serial_initfunc(s5p_serial_initialize);
67 serial_initfunc(zynq_serial_initalize);
68 serial_initfunc(bfin_serial_initialize);
69 serial_initfunc(bfin_jtag_initialize);
70 serial_initfunc(mpc512x_serial_initialize);
71 serial_initfunc(uartlite_serial_initialize);
72 serial_initfunc(au1x00_serial_initialize);
73 serial_initfunc(asc_serial_initialize);
74 serial_initfunc(jz_serial_initialize);
75 serial_initfunc(mpc5xx_serial_initialize);
76 serial_initfunc(mpc8220_serial_initialize);
77 serial_initfunc(mpc8260_scc_serial_initialize);
78 serial_initfunc(mpc8260_smc_serial_initialize);
79 serial_initfunc(mpc85xx_serial_initialize);
80 serial_initfunc(iop480_serial_initialize);
81 serial_initfunc(leon2_serial_initialize);
82 serial_initfunc(leon3_serial_initialize);
83 serial_initfunc(marvell_serial_initialize);
84 serial_initfunc(amirix_serial_initialize);
85 serial_initfunc(bmw_serial_initialize);
86 serial_initfunc(cogent_serial_initialize);
87 serial_initfunc(cpci750_serial_initialize);
88 serial_initfunc(evb64260_serial_initialize);
89 serial_initfunc(ml2_serial_initialize);
90 serial_initfunc(sconsole_serial_initialize);
91 serial_initfunc(p3mx_serial_initialize);
92 serial_initfunc(altera_jtag_serial_initialize);
93 serial_initfunc(altera_serial_initialize);
94 serial_initfunc(atmel_serial_initialize);
95 serial_initfunc(lpc32xx_serial_initialize);
96 serial_initfunc(mcf_serial_initialize);
97 serial_initfunc(ns9750_serial_initialize);
98 serial_initfunc(oc_serial_initialize);
99 serial_initfunc(s3c64xx_serial_initialize);
100 serial_initfunc(sandbox_serial_initialize);
101 serial_initfunc(clps7111_serial_initialize);
102 serial_initfunc(imx_serial_initialize);
103 serial_initfunc(ixp_serial_initialize);
104 serial_initfunc(ks8695_serial_initialize);
105 serial_initfunc(lh7a40x_serial_initialize);
106 serial_initfunc(max3100_serial_initialize);
107 serial_initfunc(mxc_serial_initialize);
108 serial_initfunc(netarm_serial_initialize);
109 serial_initfunc(pl01x_serial_initialize);
110 serial_initfunc(s3c44b0_serial_initialize);
111 serial_initfunc(sa1100_serial_initialize);
112 serial_initfunc(sh_serial_initialize);
115 * serial_register() - Register serial driver with serial driver core
116 * @dev: Pointer to the serial driver structure
118 * This function registers the serial driver supplied via @dev with
119 * serial driver core, thus making U-Boot aware of it and making it
120 * available for U-Boot to use. On platforms that still require manual
121 * relocation of constant variables, relocation of the supplied structure
124 void serial_register(struct serial_device *dev)
126 #ifdef CONFIG_NEEDS_MANUAL_RELOC
128 dev->start += gd->reloc_off;
130 dev->stop += gd->reloc_off;
132 dev->setbrg += gd->reloc_off;
134 dev->getc += gd->reloc_off;
136 dev->tstc += gd->reloc_off;
138 dev->putc += gd->reloc_off;
140 dev->puts += gd->reloc_off;
143 dev->next = serial_devices;
144 serial_devices = dev;
148 * serial_initialize() - Register all compiled-in serial port drivers
150 * This function registers all serial port drivers that are compiled
151 * into the U-Boot binary with the serial core, thus making them
152 * available to U-Boot to use. Lastly, this function assigns a default
153 * serial port to the serial core. That serial port is then used as a
156 void serial_initialize(void)
158 mpc8xx_serial_initialize();
159 ns16550_serial_initialize();
160 pxa_serial_initialize();
161 s3c24xx_serial_initialize();
162 s5p_serial_initialize();
163 mpc512x_serial_initialize();
164 bfin_serial_initialize();
165 bfin_jtag_initialize();
166 uartlite_serial_initialize();
167 zynq_serial_initalize();
168 au1x00_serial_initialize();
169 asc_serial_initialize();
170 jz_serial_initialize();
171 mpc5xx_serial_initialize();
172 mpc8220_serial_initialize();
173 mpc8260_scc_serial_initialize();
174 mpc8260_smc_serial_initialize();
175 mpc85xx_serial_initialize();
176 iop480_serial_initialize();
177 leon2_serial_initialize();
178 leon3_serial_initialize();
179 marvell_serial_initialize();
180 amirix_serial_initialize();
181 bmw_serial_initialize();
182 cogent_serial_initialize();
183 cpci750_serial_initialize();
184 evb64260_serial_initialize();
185 ml2_serial_initialize();
186 sconsole_serial_initialize();
187 p3mx_serial_initialize();
188 altera_jtag_serial_initialize();
189 altera_serial_initialize();
190 atmel_serial_initialize();
191 lpc32xx_serial_initialize();
192 mcf_serial_initialize();
193 ns9750_serial_initialize();
194 oc_serial_initialize();
195 s3c64xx_serial_initialize();
196 sandbox_serial_initialize();
197 clps7111_serial_initialize();
198 imx_serial_initialize();
199 ixp_serial_initialize();
200 ks8695_serial_initialize();
201 lh7a40x_serial_initialize();
202 max3100_serial_initialize();
203 mxc_serial_initialize();
204 netarm_serial_initialize();
205 pl01x_serial_initialize();
206 s3c44b0_serial_initialize();
207 sa1100_serial_initialize();
208 sh_serial_initialize();
210 serial_assign(default_serial_console()->name);
214 * serial_stdio_init() - Register serial ports with STDIO core
216 * This function generates a proxy driver for each serial port driver.
217 * These proxy drivers then register with the STDIO core, making the
218 * serial drivers available as STDIO devices.
220 void serial_stdio_init(void)
222 struct stdio_dev dev;
223 struct serial_device *s = serial_devices;
226 memset(&dev, 0, sizeof(dev));
228 strcpy(dev.name, s->name);
229 dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT;
231 dev.start = s->start;
238 stdio_register(&dev);
245 * serial_assign() - Select the serial output device by name
246 * @name: Name of the serial driver to be used as default output
248 * This function configures the serial output multiplexing by
249 * selecting which serial device will be used as default. In case
250 * the STDIO "serial" device is selected as stdin/stdout/stderr,
251 * the serial device previously configured by this function will be
252 * used for the particular operation.
254 * Returns 0 on success, negative on error.
256 int serial_assign(const char *name)
258 struct serial_device *s;
260 for (s = serial_devices; s; s = s->next) {
261 if (strcmp(s->name, name))
271 * serial_reinit_all() - Reinitialize all compiled-in serial ports
273 * This function reinitializes all serial ports that are compiled
274 * into U-Boot by calling their serial_start() functions.
276 void serial_reinit_all(void)
278 struct serial_device *s;
280 for (s = serial_devices; s; s = s->next)
285 * get_current() - Return pointer to currently selected serial port
287 * This function returns a pointer to currently selected serial port.
288 * The currently selected serial port is altered by serial_assign()
291 * In case this function is called before relocation or before any serial
292 * port is configured, this function calls default_serial_console() to
293 * determine the serial port. Otherwise, the configured serial port is
296 * Returns pointer to the currently selected serial port on success,
299 static struct serial_device *get_current(void)
301 struct serial_device *dev;
303 if (!(gd->flags & GD_FLG_RELOC))
304 dev = default_serial_console();
305 else if (!serial_current)
306 dev = default_serial_console();
308 dev = serial_current;
310 /* We must have a console device */
312 #ifdef CONFIG_SPL_BUILD
313 puts("Cannot find console\n");
316 panic("Cannot find console\n");
324 * serial_init() - Initialize currently selected serial port
326 * This function initializes the currently selected serial port. This
327 * usually involves setting up the registers of that particular port,
328 * enabling clock and such. This function uses the get_current() call
329 * to determine which port is selected.
331 * Returns 0 on success, negative on error.
333 int serial_init(void)
335 return get_current()->start();
339 * serial_setbrg() - Configure baud-rate of currently selected serial port
341 * This function configures the baud-rate of the currently selected
342 * serial port. The baud-rate is retrieved from global data within
343 * the serial port driver. This function uses the get_current() call
344 * to determine which port is selected.
346 * Returns 0 on success, negative on error.
348 void serial_setbrg(void)
350 get_current()->setbrg();
354 * serial_getc() - Read character from currently selected serial port
356 * This function retrieves a character from currently selected serial
357 * port. In case there is no character waiting on the serial port,
358 * this function will block and wait for the character to appear. This
359 * function uses the get_current() call to determine which port is
362 * Returns the character on success, negative on error.
364 int serial_getc(void)
366 return get_current()->getc();
370 * serial_tstc() - Test if data is available on currently selected serial port
372 * This function tests if one or more characters are available on
373 * currently selected serial port. This function never blocks. This
374 * function uses the get_current() call to determine which port is
377 * Returns positive if character is available, zero otherwise.
379 int serial_tstc(void)
381 return get_current()->tstc();
385 * serial_putc() - Output character via currently selected serial port
386 * @c: Single character to be output from the serial port.
388 * This function outputs a character via currently selected serial
389 * port. This character is passed to the serial port driver responsible
390 * for controlling the hardware. The hardware may still be in process
391 * of transmitting another character, therefore this function may block
392 * for a short amount of time. This function uses the get_current()
393 * call to determine which port is selected.
395 void serial_putc(const char c)
397 get_current()->putc(c);
401 * serial_puts() - Output string via currently selected serial port
402 * @s: Zero-terminated string to be output from the serial port.
404 * This function outputs a zero-terminated string via currently
405 * selected serial port. This function behaves as an accelerator
406 * in case the hardware can queue multiple characters for transfer.
407 * The whole string that is to be output is available to the function
408 * implementing the hardware manipulation. Transmitting the whole
409 * string may take some time, thus this function may block for some
410 * amount of time. This function uses the get_current() call to
411 * determine which port is selected.
413 void serial_puts(const char *s)
415 get_current()->puts(s);
419 * default_serial_puts() - Output string by calling serial_putc() in loop
420 * @s: Zero-terminated string to be output from the serial port.
422 * This function outputs a zero-terminated string by calling serial_putc()
423 * in a loop. Most drivers do not support queueing more than one byte for
424 * transfer, thus this function precisely implements their serial_puts().
426 * To optimize the number of get_current() calls, this function only
427 * calls get_current() once and then directly accesses the putc() call
428 * of the &struct serial_device .
430 void default_serial_puts(const char *s)
432 struct serial_device *dev = get_current();
437 #if CONFIG_POST & CONFIG_SYS_POST_UART
438 static const int bauds[] = CONFIG_SYS_BAUDRATE_TABLE;
441 * uart_post_test() - Test the currently selected serial port using POST
442 * @flags: POST framework flags
444 * Do a loopback test of the currently selected serial port. This
445 * function is only useful in the context of the POST testing framwork.
446 * The serial port is firstly configured into loopback mode and then
447 * characters are sent through it.
449 * Returns 0 on success, value otherwise.
451 /* Mark weak until post/cpu/.../uart.c migrate over */
453 int uart_post_test(int flags)
456 int ret, saved_baud, b;
457 struct serial_device *saved_dev, *s;
460 /* Save current serial state */
462 saved_dev = serial_current;
463 saved_baud = bd->bi_baudrate;
465 for (s = serial_devices; s; s = s->next) {
466 /* If this driver doesn't support loop back, skip it */
470 /* Test the next device */
477 /* Consume anything that happens to be queued */
478 while (serial_tstc())
481 /* Enable loop back */
484 /* Test every available baud rate */
485 for (b = 0; b < ARRAY_SIZE(bauds); ++b) {
486 bd->bi_baudrate = bauds[b];
490 * Stick to printable chars to avoid issues:
491 * - terminal corruption
492 * - serial program reacting to sequences and sending
493 * back random extra data
494 * - most serial drivers add in extra chars (like \r\n)
496 for (c = 0x20; c < 0x7f; ++c) {
500 /* Make sure it's the same one */
501 ret = (c != serial_getc());
507 /* Clean up the output in case it was sent */
509 ret = ('\b' != serial_getc());
517 /* Disable loop back */
520 /* XXX: There is no serial_stop() !? */
526 /* Restore previous serial state */
527 serial_current = saved_dev;
528 bd->bi_baudrate = saved_baud;