1 /* Serialport functions for debugging
3 * Copyright (c) 2000-2007 Axis Communications AB
8 * console_print_etrax(char *buf)
16 #include <linux/console.h>
17 #include <linux/init.h>
18 #include <linux/major.h>
19 #include <linux/delay.h>
20 #include <linux/tty.h>
21 #include <asm/system.h>
22 #include <arch/svinto.h>
23 #include <asm/io.h> /* Get SIMCOUT. */
25 extern void reset_watchdog(void);
30 const volatile unsigned* read;
32 volatile unsigned* xoff;
34 volatile char* tr_ctrl;
35 volatile char* rec_ctrl;
38 unsigned long baudrate;
43 struct dbg_port ports[]=
53 IO_STATE(R_IRQ_MASK1_SET, ser0_data, set),
67 IO_STATE(R_IRQ_MASK1_SET, ser1_data, set),
81 IO_STATE(R_IRQ_MASK1_SET, ser2_data, set),
95 IO_STATE(R_IRQ_MASK1_SET, ser3_data, set),
103 #ifdef CONFIG_ETRAX_SERIAL
104 extern struct tty_driver *serial_driver;
107 struct dbg_port* port =
108 #if defined(CONFIG_ETRAX_DEBUG_PORT0)
110 #elif defined(CONFIG_ETRAX_DEBUG_PORT1)
112 #elif defined(CONFIG_ETRAX_DEBUG_PORT2)
114 #elif defined(CONFIG_ETRAX_DEBUG_PORT3)
120 static struct dbg_port* kgdb_port =
121 #if defined(CONFIG_ETRAX_KGDB_PORT0)
123 #elif defined(CONFIG_ETRAX_KGDB_PORT1)
125 #elif defined(CONFIG_ETRAX_KGDB_PORT2)
127 #elif defined(CONFIG_ETRAX_KGDB_PORT3)
134 start_port(struct dbg_port* p)
136 unsigned long rec_ctrl = 0;
137 unsigned long tr_ctrl = 0;
148 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma6);
149 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma6, unused);
151 else if (p->index == 1)
153 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma8);
154 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma8, usb);
156 else if (p->index == 2)
158 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma2);
159 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma2, par0);
160 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma3);
161 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma3, par0);
162 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, ser2, select);
166 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma4);
167 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma4, par1);
168 genconfig_shadow &= ~IO_MASK(R_GEN_CONFIG, dma5);
169 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, dma5, par1);
170 genconfig_shadow |= IO_STATE(R_GEN_CONFIG, ser3, select);
173 *R_GEN_CONFIG = genconfig_shadow;
176 IO_STATE(R_SERIAL0_XOFF, tx_stop, enable) |
177 IO_STATE(R_SERIAL0_XOFF, auto_xoff, disable) |
178 IO_FIELD(R_SERIAL0_XOFF, xoff_char, 0);
185 IO_STATE(R_SERIAL0_BAUD, tr_baud, c115k2Hz) |
186 IO_STATE(R_SERIAL0_BAUD, rec_baud, c115k2Hz);
190 IO_STATE(R_SERIAL0_BAUD, tr_baud, c1200Hz) |
191 IO_STATE(R_SERIAL0_BAUD, rec_baud, c1200Hz);
195 IO_STATE(R_SERIAL0_BAUD, tr_baud, c2400Hz) |
196 IO_STATE(R_SERIAL0_BAUD, rec_baud, c2400Hz);
200 IO_STATE(R_SERIAL0_BAUD, tr_baud, c4800Hz) |
201 IO_STATE(R_SERIAL0_BAUD, rec_baud, c4800Hz);
205 IO_STATE(R_SERIAL0_BAUD, tr_baud, c9600Hz) |
206 IO_STATE(R_SERIAL0_BAUD, rec_baud, c9600Hz);
210 IO_STATE(R_SERIAL0_BAUD, tr_baud, c19k2Hz) |
211 IO_STATE(R_SERIAL0_BAUD, rec_baud, c19k2Hz);
215 IO_STATE(R_SERIAL0_BAUD, tr_baud, c38k4Hz) |
216 IO_STATE(R_SERIAL0_BAUD, rec_baud, c38k4Hz);
220 IO_STATE(R_SERIAL0_BAUD, tr_baud, c57k6Hz) |
221 IO_STATE(R_SERIAL0_BAUD, rec_baud, c57k6Hz);
225 IO_STATE(R_SERIAL0_BAUD, tr_baud, c115k2Hz) |
226 IO_STATE(R_SERIAL0_BAUD, rec_baud, c115k2Hz);
230 if (p->parity == 'E') {
232 IO_STATE(R_SERIAL0_REC_CTRL, rec_par, even) |
233 IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable);
235 IO_STATE(R_SERIAL0_TR_CTRL, tr_par, even) |
236 IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable);
237 } else if (p->parity == 'O') {
239 IO_STATE(R_SERIAL0_REC_CTRL, rec_par, odd) |
240 IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, enable);
242 IO_STATE(R_SERIAL0_TR_CTRL, tr_par, odd) |
243 IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, enable);
246 IO_STATE(R_SERIAL0_REC_CTRL, rec_par, even) |
247 IO_STATE(R_SERIAL0_REC_CTRL, rec_par_en, disable);
249 IO_STATE(R_SERIAL0_TR_CTRL, tr_par, even) |
250 IO_STATE(R_SERIAL0_TR_CTRL, tr_par_en, disable);
254 rec_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_7bit);
255 tr_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_7bit);
259 rec_ctrl |= IO_STATE(R_SERIAL0_REC_CTRL, rec_bitnr, rec_8bit);
260 tr_ctrl |= IO_STATE(R_SERIAL0_TR_CTRL, tr_bitnr, tr_8bit);
264 IO_STATE(R_SERIAL0_REC_CTRL, dma_err, stop) |
265 IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable) |
266 IO_STATE(R_SERIAL0_REC_CTRL, rts_, active) |
267 IO_STATE(R_SERIAL0_REC_CTRL, sampling, middle) |
268 IO_STATE(R_SERIAL0_REC_CTRL, rec_stick_par, normal) |
272 IO_FIELD(R_SERIAL0_TR_CTRL, txd, 0) |
273 IO_STATE(R_SERIAL0_TR_CTRL, tr_enable, enable) |
274 IO_STATE(R_SERIAL0_TR_CTRL, auto_cts, disabled) |
275 IO_STATE(R_SERIAL0_TR_CTRL, stop_bits, one_bit) |
276 IO_STATE(R_SERIAL0_TR_CTRL, tr_stick_par, normal) |
281 console_write_direct(struct console *co, const char *buf, unsigned int len)
289 local_irq_save(flags);
292 for (i = 0; i < len; i++) {
294 if (buf[i] == '\n') {
295 while (!(*port->read & IO_MASK(R_SERIAL0_READ, tr_ready)))
299 /* Wait until transmitter is ready and send.*/
300 while (!(*port->read & IO_MASK(R_SERIAL0_READ, tr_ready)))
302 *port->write = buf[i];
306 * Feed the watchdog, otherwise it will reset the chip during boot.
307 * The time to send an ordinary boot message line (10-90 chars)
308 * varies between 1-8ms at 115200. What makes up for the additional
309 * 90ms that allows the watchdog to bite?
313 local_irq_restore(flags);
317 console_write(struct console *co, const char *buf, unsigned int len)
322 #ifdef CONFIG_SVINTO_SIM
323 /* no use to simulate the serial debug output */
328 console_write_direct(co, buf, len);
331 /* legacy function */
334 console_print_etrax(const char *buf)
336 console_write(NULL, buf, strlen(buf));
339 /* Use polling to get a single character FROM the debug port */
344 unsigned long readval;
350 readval = *kgdb_port->read;
351 } while (!(readval & IO_MASK(R_SERIAL0_READ, data_avail)));
353 return (readval & IO_MASK(R_SERIAL0_READ, data_in));
356 /* Use polling to put a single character to the debug port */
359 putDebugChar(int val)
364 while (!(*kgdb_port->read & IO_MASK(R_SERIAL0_READ, tr_ready)))
366 *kgdb_port->write = val;
369 /* Enable irq for receiving chars on the debug port, used by kgdb */
377 *R_IRQ_MASK1_SET = kgdb_port->irq;
378 /* use R_VECT_MASK directly, since we really bypass Linux normal
379 * IRQ handling in kgdb anyway, we don't need to use enable_irq
381 *R_VECT_MASK_SET = IO_STATE(R_VECT_MASK_SET, serial, set);
383 *kgdb_port->rec_ctrl = IO_STATE(R_SERIAL0_REC_CTRL, rec_enable, enable);
387 console_setup(struct console *co, char *options)
392 port = &ports[co->index];
393 port->baudrate = 115200;
396 port->baudrate = simple_strtoul(options, NULL, 10);
398 while(*s >= '0' && *s <= '9')
400 if (*s) port->parity = *s++;
401 if (*s) port->bits = *s++ - '0';
409 /* This is a dummy serial device that throws away anything written to it.
410 * This is used when no debug output is wanted.
412 static struct tty_driver dummy_driver;
414 static int dummy_open(struct tty_struct *tty, struct file * filp)
419 static void dummy_close(struct tty_struct *tty, struct file * filp)
423 static int dummy_write(struct tty_struct * tty,
424 const unsigned char *buf, int count)
429 static int dummy_write_room(struct tty_struct *tty)
434 static const struct tty_operations dummy_ops = {
436 .close = dummy_close,
437 .write = dummy_write,
438 .write_room = dummy_write_room,
442 init_dummy_console(void)
444 memset(&dummy_driver, 0, sizeof(struct tty_driver));
445 dummy_driver.driver_name = "serial";
446 dummy_driver.name = "ttyS";
447 dummy_driver.major = TTY_MAJOR;
448 dummy_driver.minor_start = 68;
449 dummy_driver.num = 1; /* etrax100 has 4 serial ports */
450 dummy_driver.type = TTY_DRIVER_TYPE_SERIAL;
451 dummy_driver.subtype = SERIAL_TYPE_NORMAL;
452 dummy_driver.init_termios = tty_std_termios;
453 /* Normally B9600 default... */
454 dummy_driver.init_termios.c_cflag =
455 B115200 | CS8 | CREAD | HUPCL | CLOCAL;
456 dummy_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
457 dummy_driver.init_termios.c_ispeed = 115200;
458 dummy_driver.init_termios.c_ospeed = 115200;
460 dummy_driver.ops = &dummy_ops;
461 if (tty_register_driver(&dummy_driver))
462 panic("Couldn't register dummy serial driver\n");
465 static struct tty_driver*
466 etrax_console_device(struct console* co, int *index)
469 *index = port->index;
472 #ifdef CONFIG_ETRAX_SERIAL
473 return port ? serial_driver : &dummy_driver;
475 return &dummy_driver;
479 static struct console sercons = {
481 write: console_write,
483 device : etrax_console_device,
485 setup : console_setup,
486 flags : CON_PRINTBUFFER,
491 static struct console sercons0 = {
493 write: console_write,
495 device : etrax_console_device,
497 setup : console_setup,
498 flags : CON_PRINTBUFFER,
504 static struct console sercons1 = {
506 write: console_write,
508 device : etrax_console_device,
510 setup : console_setup,
511 flags : CON_PRINTBUFFER,
516 static struct console sercons2 = {
518 write: console_write,
520 device : etrax_console_device,
522 setup : console_setup,
523 flags : CON_PRINTBUFFER,
528 static struct console sercons3 = {
530 write: console_write,
532 device : etrax_console_device,
534 setup : console_setup,
535 flags : CON_PRINTBUFFER,
541 * Register console (for printk's etc)
545 init_etrax_debug(void)
547 static int first = 1;
550 unregister_console(&sercons);
551 register_console(&sercons0);
552 register_console(&sercons1);
553 register_console(&sercons2);
554 register_console(&sercons3);
555 init_dummy_console();
560 register_console(&sercons);
562 #ifdef CONFIG_ETRAX_KGDB
563 start_port(kgdb_port);
567 __initcall(init_etrax_debug);