2 * mcfserial.c -- serial driver for ColdFire internal UARTS.
4 * Copyright (C) 1999-2003 Greg Ungerer <gerg@snapgear.com>
5 * Copyright (c) 2000-2001 Lineo, Inc. <www.lineo.com>
6 * Copyright (C) 2001-2002 SnapGear Inc. <www.snapgear.com>
8 * Based on code from 68332serial.c which was:
10 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
11 * Copyright (C) 1998 TSHG
12 * Copyright (c) 1999 Rt-Control Inc. <jeff@uclinux.org>
15 * 08/07/2003 Daniele Bellucci <bellucda@tiscali.it>
16 * some cleanups in mcfrs_write.
20 #include <linux/module.h>
21 #include <linux/errno.h>
22 #include <linux/signal.h>
23 #include <linux/sched.h>
24 #include <linux/timer.h>
25 #include <linux/wait.h>
26 #include <linux/interrupt.h>
27 #include <linux/tty.h>
28 #include <linux/tty_flip.h>
29 #include <linux/string.h>
30 #include <linux/fcntl.h>
32 #include <linux/kernel.h>
33 #include <linux/serial.h>
34 #include <linux/serialP.h>
35 #include <linux/console.h>
36 #include <linux/init.h>
37 #include <linux/bitops.h>
38 #include <linux/delay.h>
42 #include <asm/system.h>
43 #include <asm/semaphore.h>
44 #include <asm/delay.h>
45 #include <asm/coldfire.h>
46 #include <asm/mcfsim.h>
47 #include <asm/mcfuart.h>
48 #include <asm/nettel.h>
49 #include <asm/uaccess.h>
50 #include "mcfserial.h"
52 struct timer_list mcfrs_timer_struct;
55 * Default console baud rate, we use this as the default
56 * for all ports so init can just open /dev/console and
57 * keep going. Perhaps one day the cflag settings for the
58 * console can be used instead.
60 #if defined(CONFIG_ARNEWSH) || defined(CONFIG_FREESCALE) || \
61 defined(CONFIG_senTec) || defined(CONFIG_SNEHA)
62 #define CONSOLE_BAUD_RATE 19200
63 #define DEFAULT_CBAUD B19200
66 #if defined(CONFIG_HW_FEITH)
67 #define CONSOLE_BAUD_RATE 38400
68 #define DEFAULT_CBAUD B38400
71 #if defined(CONFIG_MOD5272) || defined(CONFIG_M5208EVB)
72 #define CONSOLE_BAUD_RATE 115200
73 #define DEFAULT_CBAUD B115200
76 #ifndef CONSOLE_BAUD_RATE
77 #define CONSOLE_BAUD_RATE 9600
78 #define DEFAULT_CBAUD B9600
81 int mcfrs_console_inited = 0;
82 int mcfrs_console_port = -1;
83 int mcfrs_console_baud = CONSOLE_BAUD_RATE;
84 int mcfrs_console_cbaud = DEFAULT_CBAUD;
87 * Driver data structures.
89 static struct tty_driver *mcfrs_serial_driver;
91 /* number of characters left in xmit buffer before we ask for more */
92 #define WAKEUP_CHARS 256
96 #undef SERIAL_DEBUG_OPEN
97 #undef SERIAL_DEBUG_FLOW
99 #if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
100 defined(CONFIG_M520x)
101 #define IRQBASE (MCFINT_VECBASE+MCFINT_UART0)
107 * Configuration table, UARTs to look for at startup.
109 static struct mcf_serial mcfrs_table[] = {
112 .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE1),
114 .flags = ASYNC_BOOT_AUTOCONF,
118 .addr = (volatile unsigned char *) (MCF_MBAR+MCFUART_BASE2),
120 .flags = ASYNC_BOOT_AUTOCONF,
125 #define NR_PORTS (sizeof(mcfrs_table) / sizeof(struct mcf_serial))
128 * This is used to figure out the divisor speeds and the timeouts.
130 static int mcfrs_baud_table[] = {
131 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
132 9600, 19200, 38400, 57600, 115200, 230400, 460800, 0
134 #define MCFRS_BAUD_TABLE_SIZE \
135 (sizeof(mcfrs_baud_table)/sizeof(mcfrs_baud_table[0]))
138 #ifdef CONFIG_MAGIC_SYSRQ
140 * Magic system request keys. Used for debugging...
142 extern int magic_sysrq_key(int ch);
147 * Forware declarations...
149 static void mcfrs_change_speed(struct mcf_serial *info);
150 static void mcfrs_wait_until_sent(struct tty_struct *tty, int timeout);
153 static inline int serial_paranoia_check(struct mcf_serial *info,
154 char *name, const char *routine)
156 #ifdef SERIAL_PARANOIA_CHECK
157 static const char badmagic[] =
158 "MCFRS(warning): bad magic number for serial struct %s in %s\n";
159 static const char badinfo[] =
160 "MCFRS(warning): null mcf_serial for %s in %s\n";
163 printk(badinfo, name, routine);
166 if (info->magic != SERIAL_MAGIC) {
167 printk(badmagic, name, routine);
175 * Sets or clears DTR and RTS on the requested line.
177 static void mcfrs_setsignals(struct mcf_serial *info, int dtr, int rts)
179 volatile unsigned char *uartp;
183 printk("%s(%d): mcfrs_setsignals(info=%x,dtr=%d,rts=%d)\n",
184 __FILE__, __LINE__, info, dtr, rts);
187 local_irq_save(flags);
191 mcf_setppdata(MCFPP_DTR1, (dtr ? 0 : MCFPP_DTR1));
193 mcf_setppdata(MCFPP_DTR0, (dtr ? 0 : MCFPP_DTR0));
199 info->sigs |= TIOCM_RTS;
200 uartp[MCFUART_UOP1] = MCFUART_UOP_RTS;
202 info->sigs &= ~TIOCM_RTS;
203 uartp[MCFUART_UOP0] = MCFUART_UOP_RTS;
206 local_irq_restore(flags);
211 * Gets values of serial signals.
213 static int mcfrs_getsignals(struct mcf_serial *info)
215 volatile unsigned char *uartp;
218 #if defined(CONFIG_NETtel) && defined(CONFIG_M5307)
219 unsigned short ppdata;
223 printk("%s(%d): mcfrs_getsignals(info=%x)\n", __FILE__, __LINE__);
226 local_irq_save(flags);
228 sigs = (uartp[MCFUART_UIPR] & MCFUART_UIPR_CTS) ? 0 : TIOCM_CTS;
229 sigs |= (info->sigs & TIOCM_RTS);
234 ppdata = mcf_getppdata();
235 if (info->line == 0) {
236 sigs |= (ppdata & MCFPP_DCD0) ? 0 : TIOCM_CD;
237 sigs |= (ppdata & MCFPP_DTR0) ? 0 : TIOCM_DTR;
238 } else if (info->line == 1) {
239 sigs |= (ppdata & MCFPP_DCD1) ? 0 : TIOCM_CD;
240 sigs |= (ppdata & MCFPP_DTR1) ? 0 : TIOCM_DTR;
245 local_irq_restore(flags);
250 * ------------------------------------------------------------
251 * mcfrs_stop() and mcfrs_start()
253 * This routines are called before setting or resetting tty->stopped.
254 * They enable or disable transmitter interrupts, as necessary.
255 * ------------------------------------------------------------
257 static void mcfrs_stop(struct tty_struct *tty)
259 volatile unsigned char *uartp;
260 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
263 if (serial_paranoia_check(info, tty->name, "mcfrs_stop"))
266 local_irq_save(flags);
268 info->imr &= ~MCFUART_UIR_TXREADY;
269 uartp[MCFUART_UIMR] = info->imr;
270 local_irq_restore(flags);
273 static void mcfrs_start(struct tty_struct *tty)
275 volatile unsigned char *uartp;
276 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
279 if (serial_paranoia_check(info, tty->name, "mcfrs_start"))
282 local_irq_save(flags);
283 if (info->xmit_cnt && info->xmit_buf) {
285 info->imr |= MCFUART_UIR_TXREADY;
286 uartp[MCFUART_UIMR] = info->imr;
288 local_irq_restore(flags);
292 * ----------------------------------------------------------------------
294 * Here starts the interrupt handling routines. All of the following
295 * subroutines are declared as inline and are folded into
296 * mcfrs_interrupt(). They were separated out for readability's sake.
298 * Note: mcfrs_interrupt() is a "fast" interrupt, which means that it
299 * runs with interrupts turned off. People who may want to modify
300 * mcfrs_interrupt() should try to keep the interrupt handler as fast as
301 * possible. After you are done making modifications, it is not a bad
304 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
306 * and look at the resulting assemble code in serial.s.
308 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
309 * -----------------------------------------------------------------------
312 static inline void receive_chars(struct mcf_serial *info)
314 volatile unsigned char *uartp;
315 struct tty_struct *tty = info->tty;
316 unsigned char status, ch;
323 while ((status = uartp[MCFUART_USR]) & MCFUART_USR_RXREADY) {
325 if (tty->flip.count >= TTY_FLIPBUF_SIZE)
328 ch = uartp[MCFUART_URB];
331 #ifdef CONFIG_MAGIC_SYSRQ
332 if (mcfrs_console_inited && (info->line == mcfrs_console_port)) {
333 if (magic_sysrq_key(ch))
339 if (status & MCFUART_USR_RXERR) {
340 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETERR;
341 if (status & MCFUART_USR_RXBREAK) {
342 info->stats.rxbreak++;
343 *tty->flip.flag_buf_ptr++ = TTY_BREAK;
344 } else if (status & MCFUART_USR_RXPARITY) {
345 info->stats.rxparity++;
346 *tty->flip.flag_buf_ptr++ = TTY_PARITY;
347 } else if (status & MCFUART_USR_RXOVERRUN) {
348 info->stats.rxoverrun++;
349 *tty->flip.flag_buf_ptr++ = TTY_OVERRUN;
350 } else if (status & MCFUART_USR_RXFRAMING) {
351 info->stats.rxframing++;
352 *tty->flip.flag_buf_ptr++ = TTY_FRAME;
354 /* This should never happen... */
355 *tty->flip.flag_buf_ptr++ = 0;
358 *tty->flip.flag_buf_ptr++ = 0;
360 *tty->flip.char_buf_ptr++ = ch;
363 schedule_work(&tty->flip.work);
367 static inline void transmit_chars(struct mcf_serial *info)
369 volatile unsigned char *uartp;
374 /* Send special char - probably flow control */
375 uartp[MCFUART_UTB] = info->x_char;
380 if ((info->xmit_cnt <= 0) || info->tty->stopped) {
381 info->imr &= ~MCFUART_UIR_TXREADY;
382 uartp[MCFUART_UIMR] = info->imr;
386 while (uartp[MCFUART_USR] & MCFUART_USR_TXREADY) {
387 uartp[MCFUART_UTB] = info->xmit_buf[info->xmit_tail++];
388 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
390 if (--info->xmit_cnt <= 0)
394 if (info->xmit_cnt < WAKEUP_CHARS)
395 schedule_work(&info->tqueue);
400 * This is the serial driver's generic interrupt routine
402 irqreturn_t mcfrs_interrupt(int irq, void *dev_id, struct pt_regs *regs)
404 struct mcf_serial *info;
407 info = &mcfrs_table[(irq - IRQBASE)];
408 isr = info->addr[MCFUART_UISR] & info->imr;
410 if (isr & MCFUART_UIR_RXREADY)
412 if (isr & MCFUART_UIR_TXREADY)
413 transmit_chars(info);
418 * -------------------------------------------------------------------
419 * Here ends the serial interrupt routines.
420 * -------------------------------------------------------------------
423 static void mcfrs_offintr(void *private)
425 struct mcf_serial *info = (struct mcf_serial *) private;
426 struct tty_struct *tty;
436 * Change of state on a DCD line.
438 void mcfrs_modem_change(struct mcf_serial *info, int dcd)
440 if (info->count == 0)
443 if (info->flags & ASYNC_CHECK_CD) {
445 wake_up_interruptible(&info->open_wait);
447 schedule_work(&info->tqueue_hangup);
454 unsigned short mcfrs_ppstatus;
457 * This subroutine is called when the RS_TIMER goes off. It is used
458 * to monitor the state of the DCD lines - since they have no edge
459 * sensors and interrupt generators.
461 static void mcfrs_timer(void)
463 unsigned int ppstatus, dcdval, i;
465 ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
467 if (ppstatus != mcfrs_ppstatus) {
468 for (i = 0; (i < 2); i++) {
469 dcdval = (i ? MCFPP_DCD1 : MCFPP_DCD0);
470 if ((ppstatus & dcdval) != (mcfrs_ppstatus & dcdval)) {
471 mcfrs_modem_change(&mcfrs_table[i],
472 ((ppstatus & dcdval) ? 0 : 1));
476 mcfrs_ppstatus = ppstatus;
479 mcfrs_timer_struct.expires = jiffies + HZ/25;
480 add_timer(&mcfrs_timer_struct);
483 #endif /* MCFPP_DCD0 */
487 * This routine is called from the scheduler tqueue when the interrupt
488 * routine has signalled that a hangup has occurred. The path of
489 * hangup processing is:
491 * serial interrupt routine -> (scheduler tqueue) ->
492 * do_serial_hangup() -> tty->hangup() -> mcfrs_hangup()
495 static void do_serial_hangup(void *private)
497 struct mcf_serial *info = (struct mcf_serial *) private;
498 struct tty_struct *tty;
507 static int startup(struct mcf_serial * info)
509 volatile unsigned char *uartp;
512 if (info->flags & ASYNC_INITIALIZED)
515 if (!info->xmit_buf) {
516 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
521 local_irq_save(flags);
523 #ifdef SERIAL_DEBUG_OPEN
524 printk("starting up ttyS%d (irq %d)...\n", info->line, info->irq);
528 * Reset UART, get it into known state...
531 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
532 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
533 mcfrs_setsignals(info, 1, 1);
536 clear_bit(TTY_IO_ERROR, &info->tty->flags);
537 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
540 * and set the speed of the serial port
542 mcfrs_change_speed(info);
545 * Lastly enable the UART transmitter and receiver, and
548 info->imr = MCFUART_UIR_RXREADY;
549 uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
550 uartp[MCFUART_UIMR] = info->imr;
552 info->flags |= ASYNC_INITIALIZED;
553 local_irq_restore(flags);
558 * This routine will shutdown a serial port; interrupts are disabled, and
559 * DTR is dropped if the hangup on close termio flag is on.
561 static void shutdown(struct mcf_serial * info)
563 volatile unsigned char *uartp;
566 if (!(info->flags & ASYNC_INITIALIZED))
569 #ifdef SERIAL_DEBUG_OPEN
570 printk("Shutting down serial port %d (irq %d)....\n", info->line,
574 local_irq_save(flags);
577 uartp[MCFUART_UIMR] = 0; /* mask all interrupts */
578 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
579 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
581 if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
582 mcfrs_setsignals(info, 0, 0);
584 if (info->xmit_buf) {
585 free_page((unsigned long) info->xmit_buf);
590 set_bit(TTY_IO_ERROR, &info->tty->flags);
592 info->flags &= ~ASYNC_INITIALIZED;
593 local_irq_restore(flags);
598 * This routine is called to set the UART divisor registers to match
599 * the specified baud rate for a serial port.
601 static void mcfrs_change_speed(struct mcf_serial *info)
603 volatile unsigned char *uartp;
604 unsigned int baudclk, cflag;
606 unsigned char mr1, mr2;
609 unsigned int fraction;
612 if (!info->tty || !info->tty->termios)
614 cflag = info->tty->termios->c_cflag;
619 printk("%s(%d): mcfrs_change_speed()\n", __FILE__, __LINE__);
626 info->tty->termios->c_cflag &= ~CBAUDEX;
631 mcfrs_setsignals(info, 0, -1);
635 /* compute the baudrate clock */
638 * For the MCF5272, also compute the baudrate fraction.
640 baudclk = (MCF_BUSCLK / mcfrs_baud_table[i]) / 32;
641 fraction = MCF_BUSCLK - (baudclk * 32 * mcfrs_baud_table[i]);
643 fraction /= (32 * mcfrs_baud_table[i]);
645 baudclk = ((MCF_BUSCLK / mcfrs_baud_table[i]) + 16) / 32;
648 info->baud = mcfrs_baud_table[i];
650 mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
653 switch (cflag & CSIZE) {
654 case CS5: mr1 |= MCFUART_MR1_CS5; break;
655 case CS6: mr1 |= MCFUART_MR1_CS6; break;
656 case CS7: mr1 |= MCFUART_MR1_CS7; break;
658 default: mr1 |= MCFUART_MR1_CS8; break;
661 if (cflag & PARENB) {
662 if (cflag & CMSPAR) {
664 mr1 |= MCFUART_MR1_PARITYMARK;
666 mr1 |= MCFUART_MR1_PARITYSPACE;
669 mr1 |= MCFUART_MR1_PARITYODD;
671 mr1 |= MCFUART_MR1_PARITYEVEN;
674 mr1 |= MCFUART_MR1_PARITYNONE;
678 mr2 |= MCFUART_MR2_STOP2;
680 mr2 |= MCFUART_MR2_STOP1;
682 if (cflag & CRTSCTS) {
683 mr1 |= MCFUART_MR1_RXRTS;
684 mr2 |= MCFUART_MR2_TXCTS;
688 info->flags &= ~ASYNC_CHECK_CD;
690 info->flags |= ASYNC_CHECK_CD;
694 local_irq_save(flags);
696 printk("%s(%d): mr1=%x mr2=%x baudclk=%x\n", __FILE__, __LINE__,
700 Note: pg 12-16 of MCF5206e User's Manual states that a
701 software reset should be performed prior to changing
702 UMR1,2, UCSR, UACR, bit 7
704 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
705 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
706 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */
707 uartp[MCFUART_UMR] = mr1;
708 uartp[MCFUART_UMR] = mr2;
709 uartp[MCFUART_UBG1] = (baudclk & 0xff00) >> 8; /* set msb byte */
710 uartp[MCFUART_UBG2] = (baudclk & 0xff); /* set lsb byte */
712 uartp[MCFUART_UFPD] = (fraction & 0xf); /* set fraction */
714 uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
715 uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
716 mcfrs_setsignals(info, 1, -1);
717 local_irq_restore(flags);
721 static void mcfrs_flush_chars(struct tty_struct *tty)
723 volatile unsigned char *uartp;
724 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
727 if (serial_paranoia_check(info, tty->name, "mcfrs_flush_chars"))
730 uartp = (volatile unsigned char *) info->addr;
733 * re-enable receiver interrupt
735 local_irq_save(flags);
736 if ((!(info->imr & MCFUART_UIR_RXREADY)) &&
737 (info->flags & ASYNC_INITIALIZED) ) {
738 info->imr |= MCFUART_UIR_RXREADY;
739 uartp[MCFUART_UIMR] = info->imr;
741 local_irq_restore(flags);
743 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
747 /* Enable transmitter */
748 local_irq_save(flags);
749 info->imr |= MCFUART_UIR_TXREADY;
750 uartp[MCFUART_UIMR] = info->imr;
751 local_irq_restore(flags);
754 static int mcfrs_write(struct tty_struct * tty,
755 const unsigned char *buf, int count)
757 volatile unsigned char *uartp;
758 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
763 printk("%s(%d): mcfrs_write(tty=%x,buf=%x,count=%d)\n",
764 __FILE__, __LINE__, (int)tty, (int)buf, count);
767 if (serial_paranoia_check(info, tty->name, "mcfrs_write"))
770 if (!tty || !info->xmit_buf)
773 local_save_flags(flags);
776 c = min(count, (int) min(((int)SERIAL_XMIT_SIZE) - info->xmit_cnt - 1,
777 ((int)SERIAL_XMIT_SIZE) - info->xmit_head));
778 local_irq_restore(flags);
783 memcpy(info->xmit_buf + info->xmit_head, buf, c);
786 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
788 local_irq_restore(flags);
797 info->imr |= MCFUART_UIR_TXREADY;
798 uartp[MCFUART_UIMR] = info->imr;
799 local_irq_restore(flags);
804 static int mcfrs_write_room(struct tty_struct *tty)
806 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
809 if (serial_paranoia_check(info, tty->name, "mcfrs_write_room"))
811 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
817 static int mcfrs_chars_in_buffer(struct tty_struct *tty)
819 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
821 if (serial_paranoia_check(info, tty->name, "mcfrs_chars_in_buffer"))
823 return info->xmit_cnt;
826 static void mcfrs_flush_buffer(struct tty_struct *tty)
828 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
831 if (serial_paranoia_check(info, tty->name, "mcfrs_flush_buffer"))
834 local_irq_save(flags);
835 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
836 local_irq_restore(flags);
842 * ------------------------------------------------------------
845 * This routine is called by the upper-layer tty layer to signal that
846 * incoming characters should be throttled.
847 * ------------------------------------------------------------
849 static void mcfrs_throttle(struct tty_struct * tty)
851 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
852 #ifdef SERIAL_DEBUG_THROTTLE
855 printk("throttle %s: %d....\n", _tty_name(tty, buf),
856 tty->ldisc.chars_in_buffer(tty));
859 if (serial_paranoia_check(info, tty->name, "mcfrs_throttle"))
863 info->x_char = STOP_CHAR(tty);
865 /* Turn off RTS line (do this atomic) */
868 static void mcfrs_unthrottle(struct tty_struct * tty)
870 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
871 #ifdef SERIAL_DEBUG_THROTTLE
874 printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
875 tty->ldisc.chars_in_buffer(tty));
878 if (serial_paranoia_check(info, tty->name, "mcfrs_unthrottle"))
885 info->x_char = START_CHAR(tty);
888 /* Assert RTS line (do this atomic) */
892 * ------------------------------------------------------------
893 * mcfrs_ioctl() and friends
894 * ------------------------------------------------------------
897 static int get_serial_info(struct mcf_serial * info,
898 struct serial_struct * retinfo)
900 struct serial_struct tmp;
904 memset(&tmp, 0, sizeof(tmp));
905 tmp.type = info->type;
906 tmp.line = info->line;
907 tmp.port = (unsigned int) info->addr;
909 tmp.flags = info->flags;
910 tmp.baud_base = info->baud_base;
911 tmp.close_delay = info->close_delay;
912 tmp.closing_wait = info->closing_wait;
913 tmp.custom_divisor = info->custom_divisor;
914 return copy_to_user(retinfo,&tmp,sizeof(*retinfo)) ? -EFAULT : 0;
917 static int set_serial_info(struct mcf_serial * info,
918 struct serial_struct * new_info)
920 struct serial_struct new_serial;
921 struct mcf_serial old_info;
926 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
930 if (!capable(CAP_SYS_ADMIN)) {
931 if ((new_serial.baud_base != info->baud_base) ||
932 (new_serial.type != info->type) ||
933 (new_serial.close_delay != info->close_delay) ||
934 ((new_serial.flags & ~ASYNC_USR_MASK) !=
935 (info->flags & ~ASYNC_USR_MASK)))
937 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
938 (new_serial.flags & ASYNC_USR_MASK));
939 info->custom_divisor = new_serial.custom_divisor;
947 * OK, past this point, all the error checking has been done.
948 * At this point, we start making changes.....
951 info->baud_base = new_serial.baud_base;
952 info->flags = ((info->flags & ~ASYNC_FLAGS) |
953 (new_serial.flags & ASYNC_FLAGS));
954 info->type = new_serial.type;
955 info->close_delay = new_serial.close_delay;
956 info->closing_wait = new_serial.closing_wait;
959 retval = startup(info);
964 * get_lsr_info - get line status register info
966 * Purpose: Let user call ioctl() to get info when the UART physically
967 * is emptied. On bus types like RS485, the transmitter must
968 * release the bus after transmitting. This must be done when
969 * the transmit shift register is empty, not be done when the
970 * transmit holding register is empty. This functionality
971 * allows an RS485 driver to be written in user space.
973 static int get_lsr_info(struct mcf_serial * info, unsigned int *value)
975 volatile unsigned char *uartp;
977 unsigned char status;
979 local_irq_save(flags);
981 status = (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY) ? TIOCSER_TEMT : 0;
982 local_irq_restore(flags);
984 return put_user(status,value);
988 * This routine sends a break character out the serial port.
990 static void send_break( struct mcf_serial * info, int duration)
992 volatile unsigned char *uartp;
997 set_current_state(TASK_INTERRUPTIBLE);
1000 local_irq_save(flags);
1001 uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTART;
1002 schedule_timeout(duration);
1003 uartp[MCFUART_UCR] = MCFUART_UCR_CMDBREAKSTOP;
1004 local_irq_restore(flags);
1007 static int mcfrs_tiocmget(struct tty_struct *tty, struct file *file)
1009 struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
1011 if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
1013 if (tty->flags & (1 << TTY_IO_ERROR))
1016 return mcfrs_getsignals(info);
1019 static int mcfrs_tiocmset(struct tty_struct *tty, struct file *file,
1020 unsigned int set, unsigned int clear)
1022 struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
1023 int rts = -1, dtr = -1;
1025 if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
1027 if (tty->flags & (1 << TTY_IO_ERROR))
1030 if (set & TIOCM_RTS)
1032 if (set & TIOCM_DTR)
1034 if (clear & TIOCM_RTS)
1036 if (clear & TIOCM_DTR)
1039 mcfrs_setsignals(info, dtr, rts);
1044 static int mcfrs_ioctl(struct tty_struct *tty, struct file * file,
1045 unsigned int cmd, unsigned long arg)
1047 struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
1050 if (serial_paranoia_check(info, tty->name, "mcfrs_ioctl"))
1053 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1054 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1055 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
1056 if (tty->flags & (1 << TTY_IO_ERROR))
1061 case TCSBRK: /* SVID version: non-zero arg --> no break */
1062 retval = tty_check_change(tty);
1065 tty_wait_until_sent(tty, 0);
1067 send_break(info, HZ/4); /* 1/4 second */
1069 case TCSBRKP: /* support for POSIX tcsendbreak() */
1070 retval = tty_check_change(tty);
1073 tty_wait_until_sent(tty, 0);
1074 send_break(info, arg ? arg*(HZ/10) : HZ/4);
1077 error = put_user(C_CLOCAL(tty) ? 1 : 0,
1078 (unsigned long *) arg);
1083 get_user(arg, (unsigned long *) arg);
1084 tty->termios->c_cflag =
1085 ((tty->termios->c_cflag & ~CLOCAL) |
1086 (arg ? CLOCAL : 0));
1089 if (access_ok(VERIFY_WRITE, (void *) arg,
1090 sizeof(struct serial_struct)))
1091 return get_serial_info(info,
1092 (struct serial_struct *) arg);
1095 return set_serial_info(info,
1096 (struct serial_struct *) arg);
1097 case TIOCSERGETLSR: /* Get line status register */
1098 if (access_ok(VERIFY_WRITE, (void *) arg,
1099 sizeof(unsigned int)))
1100 return get_lsr_info(info, (unsigned int *) arg);
1102 case TIOCSERGSTRUCT:
1103 error = copy_to_user((struct mcf_serial *) arg,
1104 info, sizeof(struct mcf_serial));
1112 get_user(val, (unsigned int *) arg);
1113 mcf_setpa(MCFPP_PA11, (val ? 0 : MCFPP_PA11));
1118 val = (mcf_getpa() & MCFPP_PA11) ? 0 : 1;
1119 put_user(val, (unsigned int *) arg);
1125 return -ENOIOCTLCMD;
1130 static void mcfrs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1132 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
1134 if (tty->termios->c_cflag == old_termios->c_cflag)
1137 mcfrs_change_speed(info);
1139 if ((old_termios->c_cflag & CRTSCTS) &&
1140 !(tty->termios->c_cflag & CRTSCTS)) {
1141 tty->hw_stopped = 0;
1142 mcfrs_setsignals(info, -1, 1);
1150 * ------------------------------------------------------------
1153 * This routine is called when the serial port gets closed. First, we
1154 * wait for the last remaining data to be sent. Then, we unlink its
1155 * S structure from the interrupt chain if necessary, and we free
1156 * that IRQ if nothing is left in the chain.
1157 * ------------------------------------------------------------
1159 static void mcfrs_close(struct tty_struct *tty, struct file * filp)
1161 volatile unsigned char *uartp;
1162 struct mcf_serial *info = (struct mcf_serial *)tty->driver_data;
1163 unsigned long flags;
1165 if (!info || serial_paranoia_check(info, tty->name, "mcfrs_close"))
1168 local_irq_save(flags);
1170 if (tty_hung_up_p(filp)) {
1171 local_irq_restore(flags);
1175 #ifdef SERIAL_DEBUG_OPEN
1176 printk("mcfrs_close ttyS%d, count = %d\n", info->line, info->count);
1178 if ((tty->count == 1) && (info->count != 1)) {
1180 * Uh, oh. tty->count is 1, which means that the tty
1181 * structure will be freed. Info->count should always
1182 * be one in these conditions. If it's greater than
1183 * one, we've got real problems, since it means the
1184 * serial port won't be shutdown.
1186 printk("MCFRS: bad serial port count; tty->count is 1, "
1187 "info->count is %d\n", info->count);
1190 if (--info->count < 0) {
1191 printk("MCFRS: bad serial port count for ttyS%d: %d\n",
1192 info->line, info->count);
1196 local_irq_restore(flags);
1199 info->flags |= ASYNC_CLOSING;
1202 * Now we wait for the transmit buffer to clear; and we notify
1203 * the line discipline to only process XON/XOFF characters.
1206 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1207 tty_wait_until_sent(tty, info->closing_wait);
1210 * At this point we stop accepting input. To do this, we
1211 * disable the receive line status interrupts, and tell the
1212 * interrupt driver to stop checking the data ready bit in the
1213 * line status register.
1215 info->imr &= ~MCFUART_UIR_RXREADY;
1217 uartp[MCFUART_UIMR] = info->imr;
1220 /* FIXME: do we need to keep this enabled for console?? */
1221 if (mcfrs_console_inited && (mcfrs_console_port == info->line)) {
1222 /* Do not disable the UART */ ;
1226 if (tty->driver->flush_buffer)
1227 tty->driver->flush_buffer(tty);
1228 tty_ldisc_flush(tty);
1234 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1235 if (tty->ldisc.close)
1236 (tty->ldisc.close)(tty);
1237 tty->ldisc = ldiscs[N_TTY];
1238 tty->termios->c_line = N_TTY;
1239 if (tty->ldisc.open)
1240 (tty->ldisc.open)(tty);
1243 if (info->blocked_open) {
1244 if (info->close_delay) {
1245 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1247 wake_up_interruptible(&info->open_wait);
1249 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1250 wake_up_interruptible(&info->close_wait);
1251 local_irq_restore(flags);
1255 * mcfrs_wait_until_sent() --- wait until the transmitter is empty
1258 mcfrs_wait_until_sent(struct tty_struct *tty, int timeout)
1261 #define MCF5272_FIFO_SIZE 25 /* fifo size + shift reg */
1263 struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
1264 volatile unsigned char *uartp;
1265 unsigned long orig_jiffies, fifo_time, char_time, fifo_cnt;
1267 if (serial_paranoia_check(info, tty->name, "mcfrs_wait_until_sent"))
1270 orig_jiffies = jiffies;
1273 * Set the check interval to be 1/5 of the approximate time
1274 * to send the entire fifo, and make it at least 1. The check
1275 * interval should also be less than the timeout.
1277 * Note: we have to use pretty tight timings here to satisfy
1280 fifo_time = (MCF5272_FIFO_SIZE * HZ * 10) / info->baud;
1281 char_time = fifo_time / 5;
1284 if (timeout && timeout < char_time)
1285 char_time = timeout;
1288 * Clamp the timeout period at 2 * the time to empty the
1289 * fifo. Just to be safe, set the minimum at .5 seconds.
1292 if (fifo_time < (HZ/2))
1294 if (!timeout || timeout > fifo_time)
1295 timeout = fifo_time;
1298 * Account for the number of bytes in the UART
1299 * transmitter FIFO plus any byte being shifted out.
1301 uartp = (volatile unsigned char *) info->addr;
1303 fifo_cnt = (uartp[MCFUART_UTF] & MCFUART_UTF_TXB);
1304 if ((uartp[MCFUART_USR] & (MCFUART_USR_TXREADY|
1305 MCFUART_USR_TXEMPTY)) ==
1306 MCFUART_USR_TXREADY)
1310 msleep_interruptible(jiffies_to_msecs(char_time));
1311 if (signal_pending(current))
1313 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1318 * For the other coldfire models, assume all data has been sent
1324 * mcfrs_hangup() --- called by tty_hangup() when a hangup is signaled.
1326 void mcfrs_hangup(struct tty_struct *tty)
1328 struct mcf_serial * info = (struct mcf_serial *)tty->driver_data;
1330 if (serial_paranoia_check(info, tty->name, "mcfrs_hangup"))
1333 mcfrs_flush_buffer(tty);
1337 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1339 wake_up_interruptible(&info->open_wait);
1343 * ------------------------------------------------------------
1344 * mcfrs_open() and friends
1345 * ------------------------------------------------------------
1347 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1348 struct mcf_serial *info)
1350 DECLARE_WAITQUEUE(wait, current);
1355 * If the device is in the middle of being closed, then block
1356 * until it's done, and then try again.
1358 if (info->flags & ASYNC_CLOSING) {
1359 interruptible_sleep_on(&info->close_wait);
1360 #ifdef SERIAL_DO_RESTART
1361 if (info->flags & ASYNC_HUP_NOTIFY)
1364 return -ERESTARTSYS;
1371 * If non-blocking mode is set, or the port is not enabled,
1372 * then make the check up front and then exit.
1374 if ((filp->f_flags & O_NONBLOCK) ||
1375 (tty->flags & (1 << TTY_IO_ERROR))) {
1376 info->flags |= ASYNC_NORMAL_ACTIVE;
1380 if (tty->termios->c_cflag & CLOCAL)
1384 * Block waiting for the carrier detect and the line to become
1385 * free (i.e., not in use by the callout). While we are in
1386 * this loop, info->count is dropped by one, so that
1387 * mcfrs_close() knows when to free things. We restore it upon
1388 * exit, either normal or abnormal.
1391 add_wait_queue(&info->open_wait, &wait);
1392 #ifdef SERIAL_DEBUG_OPEN
1393 printk("block_til_ready before block: ttyS%d, count = %d\n",
1394 info->line, info->count);
1397 info->blocked_open++;
1399 local_irq_disable();
1400 mcfrs_setsignals(info, 1, 1);
1402 current->state = TASK_INTERRUPTIBLE;
1403 if (tty_hung_up_p(filp) ||
1404 !(info->flags & ASYNC_INITIALIZED)) {
1405 #ifdef SERIAL_DO_RESTART
1406 if (info->flags & ASYNC_HUP_NOTIFY)
1409 retval = -ERESTARTSYS;
1415 if (!(info->flags & ASYNC_CLOSING) &&
1416 (do_clocal || (mcfrs_getsignals(info) & TIOCM_CD)))
1418 if (signal_pending(current)) {
1419 retval = -ERESTARTSYS;
1422 #ifdef SERIAL_DEBUG_OPEN
1423 printk("block_til_ready blocking: ttyS%d, count = %d\n",
1424 info->line, info->count);
1428 current->state = TASK_RUNNING;
1429 remove_wait_queue(&info->open_wait, &wait);
1430 if (!tty_hung_up_p(filp))
1432 info->blocked_open--;
1433 #ifdef SERIAL_DEBUG_OPEN
1434 printk("block_til_ready after blocking: ttyS%d, count = %d\n",
1435 info->line, info->count);
1439 info->flags |= ASYNC_NORMAL_ACTIVE;
1444 * This routine is called whenever a serial port is opened. It
1445 * enables interrupts for a serial port, linking in its structure into
1446 * the IRQ chain. It also performs the serial-specific
1447 * initialization for the tty structure.
1449 int mcfrs_open(struct tty_struct *tty, struct file * filp)
1451 struct mcf_serial *info;
1455 if ((line < 0) || (line >= NR_PORTS))
1457 info = mcfrs_table + line;
1458 if (serial_paranoia_check(info, tty->name, "mcfrs_open"))
1460 #ifdef SERIAL_DEBUG_OPEN
1461 printk("mcfrs_open %s, count = %d\n", tty->name, info->count);
1464 tty->driver_data = info;
1468 * Start up serial port
1470 retval = startup(info);
1474 retval = block_til_ready(tty, filp, info);
1476 #ifdef SERIAL_DEBUG_OPEN
1477 printk("mcfrs_open returning after block_til_ready with %d\n",
1483 #ifdef SERIAL_DEBUG_OPEN
1484 printk("mcfrs_open %s successful...\n", tty->name);
1490 * Based on the line number set up the internal interrupt stuff.
1492 static void mcfrs_irqinit(struct mcf_serial *info)
1494 #if defined(CONFIG_M5272)
1495 volatile unsigned long *icrp;
1496 volatile unsigned long *portp;
1497 volatile unsigned char *uartp;
1500 icrp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_ICR2);
1502 switch (info->line) {
1510 printk("MCFRS: don't know how to handle UART %d interrupt?\n",
1515 /* Enable the output lines for the serial ports */
1516 portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PBCNT);
1517 *portp = (*portp & ~0x000000ff) | 0x00000055;
1518 portp = (volatile unsigned long *) (MCF_MBAR + MCFSIM_PDCNT);
1519 *portp = (*portp & ~0x000003fc) | 0x000002a8;
1520 #elif defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x)
1521 volatile unsigned char *icrp, *uartp;
1522 volatile unsigned long *imrp;
1526 icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 +
1527 MCFINTC_ICR0 + MCFINT_UART0 + info->line);
1528 *icrp = 0x33; /* UART0 with level 6, priority 3 */
1530 imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
1532 *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
1533 #elif defined(CONFIG_M520x)
1534 volatile unsigned char *icrp, *uartp;
1535 volatile unsigned long *imrp;
1539 icrp = (volatile unsigned char *) (MCF_MBAR + MCFICM_INTC0 +
1540 MCFINTC_ICR0 + MCFINT_UART0 + info->line);
1543 imrp = (volatile unsigned long *) (MCF_MBAR + MCFICM_INTC0 +
1545 *imrp &= ~((1 << (info->irq - MCFINT_VECBASE)) | 1);
1546 if (info->line < 2) {
1547 unsigned short *uart_par;
1548 uart_par = (unsigned short *)(MCF_IPSBAR + MCF_GPIO_PAR_UART);
1549 if (info->line == 0)
1550 *uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD0
1551 | MCF_GPIO_PAR_UART_PAR_URXD0;
1552 else if (info->line == 1)
1553 *uart_par |= MCF_GPIO_PAR_UART_PAR_UTXD1
1554 | MCF_GPIO_PAR_UART_PAR_URXD1;
1555 } else if (info->line == 2) {
1556 unsigned char *feci2c_par;
1557 feci2c_par = (unsigned char *)(MCF_IPSBAR + MCF_GPIO_PAR_FECI2C);
1558 *feci2c_par &= ~0x0F;
1559 *feci2c_par |= MCF_GPIO_PAR_FECI2C_PAR_SCL_UTXD2
1560 | MCF_GPIO_PAR_FECI2C_PAR_SDA_URXD2;
1563 volatile unsigned char *icrp, *uartp;
1565 switch (info->line) {
1567 icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART1ICR);
1568 *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
1570 mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART1);
1573 icrp = (volatile unsigned char *) (MCF_MBAR + MCFSIM_UART2ICR);
1574 *icrp = /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6 |
1576 mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART2);
1579 printk("MCFRS: don't know how to handle UART %d interrupt?\n",
1585 uartp[MCFUART_UIVR] = info->irq;
1588 /* Clear mask, so no surprise interrupts. */
1589 uartp[MCFUART_UIMR] = 0;
1591 if (request_irq(info->irq, mcfrs_interrupt, SA_INTERRUPT,
1592 "ColdFire UART", NULL)) {
1593 printk("MCFRS: Unable to attach ColdFire UART %d interrupt "
1594 "vector=%d\n", info->line, info->irq);
1601 char *mcfrs_drivername = "ColdFire internal UART serial driver version 1.00\n";
1605 * Serial stats reporting...
1607 int mcfrs_readproc(char *page, char **start, off_t off, int count,
1608 int *eof, void *data)
1610 struct mcf_serial *info;
1614 len = sprintf(page, mcfrs_drivername);
1615 for (i = 0; (i < NR_PORTS); i++) {
1616 info = &mcfrs_table[i];
1617 len += sprintf((page + len), "%d: port:%x irq=%d baud:%d ",
1618 i, (unsigned int) info->addr, info->irq, info->baud);
1619 if (info->stats.rx || info->stats.tx)
1620 len += sprintf((page + len), "tx:%d rx:%d ",
1621 info->stats.tx, info->stats.rx);
1622 if (info->stats.rxframing)
1623 len += sprintf((page + len), "fe:%d ",
1624 info->stats.rxframing);
1625 if (info->stats.rxparity)
1626 len += sprintf((page + len), "pe:%d ",
1627 info->stats.rxparity);
1628 if (info->stats.rxbreak)
1629 len += sprintf((page + len), "brk:%d ",
1630 info->stats.rxbreak);
1631 if (info->stats.rxoverrun)
1632 len += sprintf((page + len), "oe:%d ",
1633 info->stats.rxoverrun);
1635 str[0] = str[1] = 0;
1636 if ((sigs = mcfrs_getsignals(info))) {
1637 if (sigs & TIOCM_RTS)
1638 strcat(str, "|RTS");
1639 if (sigs & TIOCM_CTS)
1640 strcat(str, "|CTS");
1641 if (sigs & TIOCM_DTR)
1642 strcat(str, "|DTR");
1643 if (sigs & TIOCM_CD)
1647 len += sprintf((page + len), "%s\n", &str[1]);
1654 /* Finally, routines used to initialize the serial driver. */
1656 static void show_serial_version(void)
1658 printk(mcfrs_drivername);
1661 static struct tty_operations mcfrs_ops = {
1663 .close = mcfrs_close,
1664 .write = mcfrs_write,
1665 .flush_chars = mcfrs_flush_chars,
1666 .write_room = mcfrs_write_room,
1667 .chars_in_buffer = mcfrs_chars_in_buffer,
1668 .flush_buffer = mcfrs_flush_buffer,
1669 .ioctl = mcfrs_ioctl,
1670 .throttle = mcfrs_throttle,
1671 .unthrottle = mcfrs_unthrottle,
1672 .set_termios = mcfrs_set_termios,
1674 .start = mcfrs_start,
1675 .hangup = mcfrs_hangup,
1676 .read_proc = mcfrs_readproc,
1677 .wait_until_sent = mcfrs_wait_until_sent,
1678 .tiocmget = mcfrs_tiocmget,
1679 .tiocmset = mcfrs_tiocmset,
1682 /* mcfrs_init inits the driver */
1686 struct mcf_serial *info;
1687 unsigned long flags;
1690 /* Setup base handler, and timer table. */
1692 init_timer(&mcfrs_timer_struct);
1693 mcfrs_timer_struct.function = mcfrs_timer;
1694 mcfrs_timer_struct.data = 0;
1695 mcfrs_timer_struct.expires = jiffies + HZ/25;
1696 add_timer(&mcfrs_timer_struct);
1697 mcfrs_ppstatus = mcf_getppdata() & (MCFPP_DCD0 | MCFPP_DCD1);
1699 mcfrs_serial_driver = alloc_tty_driver(NR_PORTS);
1700 if (!mcfrs_serial_driver)
1703 show_serial_version();
1705 /* Initialize the tty_driver structure */
1706 mcfrs_serial_driver->owner = THIS_MODULE;
1707 mcfrs_serial_driver->name = "ttyS";
1708 mcfrs_serial_driver->devfs_name = "ttys/";
1709 mcfrs_serial_driver->driver_name = "serial";
1710 mcfrs_serial_driver->major = TTY_MAJOR;
1711 mcfrs_serial_driver->minor_start = 64;
1712 mcfrs_serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1713 mcfrs_serial_driver->subtype = SERIAL_TYPE_NORMAL;
1714 mcfrs_serial_driver->init_termios = tty_std_termios;
1716 mcfrs_serial_driver->init_termios.c_cflag =
1717 mcfrs_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1718 mcfrs_serial_driver->flags = TTY_DRIVER_REAL_RAW;
1720 tty_set_operations(mcfrs_serial_driver, &mcfrs_ops);
1722 if (tty_register_driver(mcfrs_serial_driver)) {
1723 printk("MCFRS: Couldn't register serial driver\n");
1724 put_tty_driver(mcfrs_serial_driver);
1728 local_irq_save(flags);
1731 * Configure all the attached serial ports.
1733 for (i = 0, info = mcfrs_table; (i < NR_PORTS); i++, info++) {
1734 info->magic = SERIAL_MAGIC;
1737 info->custom_divisor = 16;
1738 info->close_delay = 50;
1739 info->closing_wait = 3000;
1743 info->blocked_open = 0;
1744 INIT_WORK(&info->tqueue, mcfrs_offintr, info);
1745 INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
1746 init_waitqueue_head(&info->open_wait);
1747 init_waitqueue_head(&info->close_wait);
1750 mcfrs_setsignals(info, 0, 0);
1751 mcfrs_irqinit(info);
1753 printk("ttyS%d at 0x%04x (irq = %d)", info->line,
1754 (unsigned int) info->addr, info->irq);
1755 printk(" is a builtin ColdFire UART\n");
1758 local_irq_restore(flags);
1762 module_init(mcfrs_init);
1764 /****************************************************************************/
1765 /* Serial Console */
1766 /****************************************************************************/
1769 * Quick and dirty UART initialization, for console output.
1772 void mcfrs_init_console(void)
1774 volatile unsigned char *uartp;
1778 * Reset UART, get it into known state...
1780 uartp = (volatile unsigned char *) (MCF_MBAR +
1781 (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));
1783 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETRX; /* reset RX */
1784 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETTX; /* reset TX */
1785 uartp[MCFUART_UCR] = MCFUART_UCR_CMDRESETMRPTR; /* reset MR pointer */
1788 * Set port for defined baud , 8 data bits, 1 stop bit, no parity.
1790 uartp[MCFUART_UMR] = MCFUART_MR1_PARITYNONE | MCFUART_MR1_CS8;
1791 uartp[MCFUART_UMR] = MCFUART_MR2_STOP1;
1793 clk = ((MCF_BUSCLK / mcfrs_console_baud) + 16) / 32; /* set baud */
1794 uartp[MCFUART_UBG1] = (clk & 0xff00) >> 8; /* set msb baud */
1795 uartp[MCFUART_UBG2] = (clk & 0xff); /* set lsb baud */
1797 uartp[MCFUART_UCSR] = MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER;
1798 uartp[MCFUART_UCR] = MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE;
1800 mcfrs_console_inited++;
1806 * Setup for console. Argument comes from the boot command line.
1809 int mcfrs_console_setup(struct console *cp, char *arg)
1811 int i, n = CONSOLE_BAUD_RATE;
1816 if (!strncmp(cp->name, "ttyS", 4))
1817 mcfrs_console_port = cp->index;
1818 else if (!strncmp(cp->name, "cua", 3))
1819 mcfrs_console_port = cp->index;
1824 n = simple_strtoul(arg,NULL,0);
1825 for (i = 0; i < MCFRS_BAUD_TABLE_SIZE; i++)
1826 if (mcfrs_baud_table[i] == n)
1828 if (i < MCFRS_BAUD_TABLE_SIZE) {
1829 mcfrs_console_baud = n;
1830 mcfrs_console_cbaud = 0;
1832 mcfrs_console_cbaud |= CBAUDEX;
1835 mcfrs_console_cbaud |= i;
1837 mcfrs_init_console(); /* make sure baud rate changes */
1842 static struct tty_driver *mcfrs_console_device(struct console *c, int *index)
1845 return mcfrs_serial_driver;
1850 * Output a single character, using UART polled mode.
1851 * This is used for console output.
1854 void mcfrs_put_char(char ch)
1856 volatile unsigned char *uartp;
1857 unsigned long flags;
1860 uartp = (volatile unsigned char *) (MCF_MBAR +
1861 (mcfrs_console_port ? MCFUART_BASE2 : MCFUART_BASE1));
1863 local_irq_save(flags);
1864 for (i = 0; (i < 0x10000); i++) {
1865 if (uartp[MCFUART_USR] & MCFUART_USR_TXREADY)
1869 uartp[MCFUART_UTB] = ch;
1870 for (i = 0; (i < 0x10000); i++)
1871 if (uartp[MCFUART_USR] & MCFUART_USR_TXEMPTY)
1875 mcfrs_init_console(); /* try and get it back */
1876 local_irq_restore(flags);
1883 * rs_console_write is registered for printk output.
1886 void mcfrs_console_write(struct console *cp, const char *p, unsigned len)
1888 if (!mcfrs_console_inited)
1889 mcfrs_init_console();
1892 mcfrs_put_char('\r');
1893 mcfrs_put_char(*p++);
1898 * declare our consoles
1901 struct console mcfrs_console = {
1903 .write = mcfrs_console_write,
1904 .device = mcfrs_console_device,
1905 .setup = mcfrs_console_setup,
1906 .flags = CON_PRINTBUFFER,
1910 static int __init mcfrs_console_init(void)
1912 register_console(&mcfrs_console);
1916 console_initcall(mcfrs_console_init);
1918 /****************************************************************************/