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/delay.h>
44 #include <asm/coldfire.h>
45 #include <asm/mcfsim.h>
46 #include <asm/mcfuart.h>
47 #include <asm/nettel.h>
48 #include <asm/uaccess.h>
49 #include "mcfserial.h"
51 struct timer_list mcfrs_timer_struct
;
54 * Default console baud rate, we use this as the default
55 * for all ports so init can just open /dev/console and
56 * keep going. Perhaps one day the cflag settings for the
57 * console can be used instead.
59 #if defined(CONFIG_HW_FEITH)
60 #define CONSOLE_BAUD_RATE 38400
61 #define DEFAULT_CBAUD B38400
62 #elif defined(CONFIG_MOD5272) || defined(CONFIG_M5208EVB) || \
63 defined(CONFIG_M5329EVB) || defined(CONFIG_GILBARCO)
64 #define CONSOLE_BAUD_RATE 115200
65 #define DEFAULT_CBAUD B115200
66 #elif defined(CONFIG_ARNEWSH) || defined(CONFIG_FREESCALE) || \
67 defined(CONFIG_senTec) || defined(CONFIG_SNEHA) || defined(CONFIG_AVNET)
68 #define CONSOLE_BAUD_RATE 19200
69 #define DEFAULT_CBAUD B19200
72 #ifndef CONSOLE_BAUD_RATE
73 #define CONSOLE_BAUD_RATE 9600
74 #define DEFAULT_CBAUD B9600
77 int mcfrs_console_inited
= 0;
78 int mcfrs_console_port
= -1;
79 int mcfrs_console_baud
= CONSOLE_BAUD_RATE
;
80 int mcfrs_console_cbaud
= DEFAULT_CBAUD
;
83 * Driver data structures.
85 static struct tty_driver
*mcfrs_serial_driver
;
87 /* number of characters left in xmit buffer before we ask for more */
88 #define WAKEUP_CHARS 256
92 #undef SERIAL_DEBUG_OPEN
93 #undef SERIAL_DEBUG_FLOW
95 #if defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
96 defined(CONFIG_M520x) || defined(CONFIG_M532x)
97 #define IRQBASE (MCFINT_VECBASE+MCFINT_UART0)
103 * Configuration table, UARTs to look for at startup.
105 static struct mcf_serial mcfrs_table
[] = {
108 .addr
= (volatile unsigned char *) (MCF_MBAR
+MCFUART_BASE1
),
110 .flags
= ASYNC_BOOT_AUTOCONF
,
115 .addr
= (volatile unsigned char *) (MCF_MBAR
+MCFUART_BASE2
),
117 .flags
= ASYNC_BOOT_AUTOCONF
,
123 .addr
= (volatile unsigned char *) (MCF_MBAR
+MCFUART_BASE3
),
125 .flags
= ASYNC_BOOT_AUTOCONF
,
131 .addr
= (volatile unsigned char *) (MCF_MBAR
+MCFUART_BASE4
),
133 .flags
= ASYNC_BOOT_AUTOCONF
,
139 #define NR_PORTS (sizeof(mcfrs_table) / sizeof(struct mcf_serial))
142 * This is used to figure out the divisor speeds and the timeouts.
144 static int mcfrs_baud_table
[] = {
145 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
146 9600, 19200, 38400, 57600, 115200, 230400, 460800, 0
148 #define MCFRS_BAUD_TABLE_SIZE \
149 (sizeof(mcfrs_baud_table)/sizeof(mcfrs_baud_table[0]))
152 #ifdef CONFIG_MAGIC_SYSRQ
154 * Magic system request keys. Used for debugging...
156 extern int magic_sysrq_key(int ch
);
161 * Forware declarations...
163 static void mcfrs_change_speed(struct mcf_serial
*info
);
164 static void mcfrs_wait_until_sent(struct tty_struct
*tty
, int timeout
);
167 static inline int serial_paranoia_check(struct mcf_serial
*info
,
168 char *name
, const char *routine
)
170 #ifdef SERIAL_PARANOIA_CHECK
171 static const char badmagic
[] =
172 "MCFRS(warning): bad magic number for serial struct %s in %s\n";
173 static const char badinfo
[] =
174 "MCFRS(warning): null mcf_serial for %s in %s\n";
177 printk(badinfo
, name
, routine
);
180 if (info
->magic
!= SERIAL_MAGIC
) {
181 printk(badmagic
, name
, routine
);
189 * Sets or clears DTR and RTS on the requested line.
191 static void mcfrs_setsignals(struct mcf_serial
*info
, int dtr
, int rts
)
193 volatile unsigned char *uartp
;
197 printk("%s(%d): mcfrs_setsignals(info=%x,dtr=%d,rts=%d)\n",
198 __FILE__
, __LINE__
, info
, dtr
, rts
);
201 local_irq_save(flags
);
205 mcf_setppdata(MCFPP_DTR1
, (dtr
? 0 : MCFPP_DTR1
));
207 mcf_setppdata(MCFPP_DTR0
, (dtr
? 0 : MCFPP_DTR0
));
213 info
->sigs
|= TIOCM_RTS
;
214 uartp
[MCFUART_UOP1
] = MCFUART_UOP_RTS
;
216 info
->sigs
&= ~TIOCM_RTS
;
217 uartp
[MCFUART_UOP0
] = MCFUART_UOP_RTS
;
220 local_irq_restore(flags
);
225 * Gets values of serial signals.
227 static int mcfrs_getsignals(struct mcf_serial
*info
)
229 volatile unsigned char *uartp
;
232 #if defined(CONFIG_NETtel) && defined(CONFIG_M5307)
233 unsigned short ppdata
;
237 printk("%s(%d): mcfrs_getsignals(info=%x)\n", __FILE__
, __LINE__
);
240 local_irq_save(flags
);
242 sigs
= (uartp
[MCFUART_UIPR
] & MCFUART_UIPR_CTS
) ? 0 : TIOCM_CTS
;
243 sigs
|= (info
->sigs
& TIOCM_RTS
);
248 ppdata
= mcf_getppdata();
249 if (info
->line
== 0) {
250 sigs
|= (ppdata
& MCFPP_DCD0
) ? 0 : TIOCM_CD
;
251 sigs
|= (ppdata
& MCFPP_DTR0
) ? 0 : TIOCM_DTR
;
252 } else if (info
->line
== 1) {
253 sigs
|= (ppdata
& MCFPP_DCD1
) ? 0 : TIOCM_CD
;
254 sigs
|= (ppdata
& MCFPP_DTR1
) ? 0 : TIOCM_DTR
;
259 local_irq_restore(flags
);
264 * ------------------------------------------------------------
265 * mcfrs_stop() and mcfrs_start()
267 * This routines are called before setting or resetting tty->stopped.
268 * They enable or disable transmitter interrupts, as necessary.
269 * ------------------------------------------------------------
271 static void mcfrs_stop(struct tty_struct
*tty
)
273 volatile unsigned char *uartp
;
274 struct mcf_serial
*info
= (struct mcf_serial
*)tty
->driver_data
;
277 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_stop"))
280 local_irq_save(flags
);
282 info
->imr
&= ~MCFUART_UIR_TXREADY
;
283 uartp
[MCFUART_UIMR
] = info
->imr
;
284 local_irq_restore(flags
);
287 static void mcfrs_start(struct tty_struct
*tty
)
289 volatile unsigned char *uartp
;
290 struct mcf_serial
*info
= (struct mcf_serial
*)tty
->driver_data
;
293 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_start"))
296 local_irq_save(flags
);
297 if (info
->xmit_cnt
&& info
->xmit_buf
) {
299 info
->imr
|= MCFUART_UIR_TXREADY
;
300 uartp
[MCFUART_UIMR
] = info
->imr
;
302 local_irq_restore(flags
);
306 * ----------------------------------------------------------------------
308 * Here starts the interrupt handling routines. All of the following
309 * subroutines are declared as inline and are folded into
310 * mcfrs_interrupt(). They were separated out for readability's sake.
312 * Note: mcfrs_interrupt() is a "fast" interrupt, which means that it
313 * runs with interrupts turned off. People who may want to modify
314 * mcfrs_interrupt() should try to keep the interrupt handler as fast as
315 * possible. After you are done making modifications, it is not a bad
318 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
320 * and look at the resulting assemble code in serial.s.
322 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
323 * -----------------------------------------------------------------------
326 static inline void receive_chars(struct mcf_serial
*info
)
328 volatile unsigned char *uartp
;
329 struct tty_struct
*tty
= info
->tty
;
330 unsigned char status
, ch
, flag
;
337 while ((status
= uartp
[MCFUART_USR
]) & MCFUART_USR_RXREADY
) {
338 ch
= uartp
[MCFUART_URB
];
341 #ifdef CONFIG_MAGIC_SYSRQ
342 if (mcfrs_console_inited
&& (info
->line
== mcfrs_console_port
)) {
343 if (magic_sysrq_key(ch
))
349 if (status
& MCFUART_USR_RXERR
) {
350 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDRESETERR
;
351 if (status
& MCFUART_USR_RXBREAK
) {
352 info
->stats
.rxbreak
++;
354 } else if (status
& MCFUART_USR_RXPARITY
) {
355 info
->stats
.rxparity
++;
357 } else if (status
& MCFUART_USR_RXOVERRUN
) {
358 info
->stats
.rxoverrun
++;
360 } else if (status
& MCFUART_USR_RXFRAMING
) {
361 info
->stats
.rxframing
++;
365 tty_insert_flip_char(tty
, ch
, flag
);
367 tty_schedule_flip(tty
);
371 static inline void transmit_chars(struct mcf_serial
*info
)
373 volatile unsigned char *uartp
;
378 /* Send special char - probably flow control */
379 uartp
[MCFUART_UTB
] = info
->x_char
;
384 if ((info
->xmit_cnt
<= 0) || info
->tty
->stopped
) {
385 info
->imr
&= ~MCFUART_UIR_TXREADY
;
386 uartp
[MCFUART_UIMR
] = info
->imr
;
390 while (uartp
[MCFUART_USR
] & MCFUART_USR_TXREADY
) {
391 uartp
[MCFUART_UTB
] = info
->xmit_buf
[info
->xmit_tail
++];
392 info
->xmit_tail
= info
->xmit_tail
& (SERIAL_XMIT_SIZE
-1);
394 if (--info
->xmit_cnt
<= 0)
398 if (info
->xmit_cnt
< WAKEUP_CHARS
)
399 schedule_work(&info
->tqueue
);
404 * This is the serial driver's generic interrupt routine
406 irqreturn_t
mcfrs_interrupt(int irq
, void *dev_id
)
408 struct mcf_serial
*info
;
411 info
= &mcfrs_table
[(irq
- IRQBASE
)];
412 isr
= info
->addr
[MCFUART_UISR
] & info
->imr
;
414 if (isr
& MCFUART_UIR_RXREADY
)
416 if (isr
& MCFUART_UIR_TXREADY
)
417 transmit_chars(info
);
422 * -------------------------------------------------------------------
423 * Here ends the serial interrupt routines.
424 * -------------------------------------------------------------------
427 static void mcfrs_offintr(struct work_struct
*work
)
429 struct mcf_serial
*info
= container_of(work
, struct mcf_serial
, tqueue
);
430 struct tty_struct
*tty
= info
->tty
;
438 * Change of state on a DCD line.
440 void mcfrs_modem_change(struct mcf_serial
*info
, int dcd
)
442 if (info
->count
== 0)
445 if (info
->flags
& ASYNC_CHECK_CD
) {
447 wake_up_interruptible(&info
->open_wait
);
449 schedule_work(&info
->tqueue_hangup
);
456 unsigned short mcfrs_ppstatus
;
459 * This subroutine is called when the RS_TIMER goes off. It is used
460 * to monitor the state of the DCD lines - since they have no edge
461 * sensors and interrupt generators.
463 static void mcfrs_timer(void)
465 unsigned int ppstatus
, dcdval
, i
;
467 ppstatus
= mcf_getppdata() & (MCFPP_DCD0
| MCFPP_DCD1
);
469 if (ppstatus
!= mcfrs_ppstatus
) {
470 for (i
= 0; (i
< 2); i
++) {
471 dcdval
= (i
? MCFPP_DCD1
: MCFPP_DCD0
);
472 if ((ppstatus
& dcdval
) != (mcfrs_ppstatus
& dcdval
)) {
473 mcfrs_modem_change(&mcfrs_table
[i
],
474 ((ppstatus
& dcdval
) ? 0 : 1));
478 mcfrs_ppstatus
= ppstatus
;
481 mcfrs_timer_struct
.expires
= jiffies
+ HZ
/25;
482 add_timer(&mcfrs_timer_struct
);
485 #endif /* MCFPP_DCD0 */
489 * This routine is called from the scheduler tqueue when the interrupt
490 * routine has signalled that a hangup has occurred. The path of
491 * hangup processing is:
493 * serial interrupt routine -> (scheduler tqueue) ->
494 * do_serial_hangup() -> tty->hangup() -> mcfrs_hangup()
497 static void do_serial_hangup(struct work_struct
*work
)
499 struct mcf_serial
*info
= container_of(work
, struct mcf_serial
, tqueue_hangup
);
500 struct tty_struct
*tty
= info
->tty
;
506 static int startup(struct mcf_serial
* info
)
508 volatile unsigned char *uartp
;
511 if (info
->flags
& ASYNC_INITIALIZED
)
514 if (!info
->xmit_buf
) {
515 info
->xmit_buf
= (unsigned char *) __get_free_page(GFP_KERNEL
);
520 local_irq_save(flags
);
522 #ifdef SERIAL_DEBUG_OPEN
523 printk("starting up ttyS%d (irq %d)...\n", info
->line
, info
->irq
);
527 * Reset UART, get it into known state...
530 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDRESETRX
; /* reset RX */
531 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDRESETTX
; /* reset TX */
532 mcfrs_setsignals(info
, 1, 1);
535 clear_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
536 info
->xmit_cnt
= info
->xmit_head
= info
->xmit_tail
= 0;
539 * and set the speed of the serial port
541 mcfrs_change_speed(info
);
544 * Lastly enable the UART transmitter and receiver, and
547 info
->imr
= MCFUART_UIR_RXREADY
;
548 uartp
[MCFUART_UCR
] = MCFUART_UCR_RXENABLE
| MCFUART_UCR_TXENABLE
;
549 uartp
[MCFUART_UIMR
] = info
->imr
;
551 info
->flags
|= ASYNC_INITIALIZED
;
552 local_irq_restore(flags
);
557 * This routine will shutdown a serial port; interrupts are disabled, and
558 * DTR is dropped if the hangup on close termio flag is on.
560 static void shutdown(struct mcf_serial
* info
)
562 volatile unsigned char *uartp
;
565 if (!(info
->flags
& ASYNC_INITIALIZED
))
568 #ifdef SERIAL_DEBUG_OPEN
569 printk("Shutting down serial port %d (irq %d)....\n", info
->line
,
573 local_irq_save(flags
);
576 uartp
[MCFUART_UIMR
] = 0; /* mask all interrupts */
577 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDRESETRX
; /* reset RX */
578 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDRESETTX
; /* reset TX */
580 if (!info
->tty
|| (info
->tty
->termios
->c_cflag
& HUPCL
))
581 mcfrs_setsignals(info
, 0, 0);
583 if (info
->xmit_buf
) {
584 free_page((unsigned long) info
->xmit_buf
);
589 set_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
591 info
->flags
&= ~ASYNC_INITIALIZED
;
592 local_irq_restore(flags
);
597 * This routine is called to set the UART divisor registers to match
598 * the specified baud rate for a serial port.
600 static void mcfrs_change_speed(struct mcf_serial
*info
)
602 volatile unsigned char *uartp
;
603 unsigned int baudclk
, cflag
;
605 unsigned char mr1
, mr2
;
608 unsigned int fraction
;
611 if (!info
->tty
|| !info
->tty
->termios
)
613 cflag
= info
->tty
->termios
->c_cflag
;
618 printk("%s(%d): mcfrs_change_speed()\n", __FILE__
, __LINE__
);
625 info
->tty
->termios
->c_cflag
&= ~CBAUDEX
;
630 mcfrs_setsignals(info
, 0, -1);
634 /* compute the baudrate clock */
637 * For the MCF5272, also compute the baudrate fraction.
639 baudclk
= (MCF_BUSCLK
/ mcfrs_baud_table
[i
]) / 32;
640 fraction
= MCF_BUSCLK
- (baudclk
* 32 * mcfrs_baud_table
[i
]);
642 fraction
/= (32 * mcfrs_baud_table
[i
]);
644 baudclk
= ((MCF_BUSCLK
/ mcfrs_baud_table
[i
]) + 16) / 32;
647 info
->baud
= mcfrs_baud_table
[i
];
649 mr1
= MCFUART_MR1_RXIRQRDY
| MCFUART_MR1_RXERRCHAR
;
652 switch (cflag
& CSIZE
) {
653 case CS5
: mr1
|= MCFUART_MR1_CS5
; break;
654 case CS6
: mr1
|= MCFUART_MR1_CS6
; break;
655 case CS7
: mr1
|= MCFUART_MR1_CS7
; break;
657 default: mr1
|= MCFUART_MR1_CS8
; break;
660 if (cflag
& PARENB
) {
661 if (cflag
& CMSPAR
) {
663 mr1
|= MCFUART_MR1_PARITYMARK
;
665 mr1
|= MCFUART_MR1_PARITYSPACE
;
668 mr1
|= MCFUART_MR1_PARITYODD
;
670 mr1
|= MCFUART_MR1_PARITYEVEN
;
673 mr1
|= MCFUART_MR1_PARITYNONE
;
677 mr2
|= MCFUART_MR2_STOP2
;
679 mr2
|= MCFUART_MR2_STOP1
;
681 if (cflag
& CRTSCTS
) {
682 mr1
|= MCFUART_MR1_RXRTS
;
683 mr2
|= MCFUART_MR2_TXCTS
;
687 info
->flags
&= ~ASYNC_CHECK_CD
;
689 info
->flags
|= ASYNC_CHECK_CD
;
693 local_irq_save(flags
);
695 printk("%s(%d): mr1=%x mr2=%x baudclk=%x\n", __FILE__
, __LINE__
,
699 Note: pg 12-16 of MCF5206e User's Manual states that a
700 software reset should be performed prior to changing
701 UMR1,2, UCSR, UACR, bit 7
703 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDRESETRX
; /* reset RX */
704 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDRESETTX
; /* reset TX */
705 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDRESETMRPTR
; /* reset MR pointer */
706 uartp
[MCFUART_UMR
] = mr1
;
707 uartp
[MCFUART_UMR
] = mr2
;
708 uartp
[MCFUART_UBG1
] = (baudclk
& 0xff00) >> 8; /* set msb byte */
709 uartp
[MCFUART_UBG2
] = (baudclk
& 0xff); /* set lsb byte */
711 uartp
[MCFUART_UFPD
] = (fraction
& 0xf); /* set fraction */
713 uartp
[MCFUART_UCSR
] = MCFUART_UCSR_RXCLKTIMER
| MCFUART_UCSR_TXCLKTIMER
;
714 uartp
[MCFUART_UCR
] = MCFUART_UCR_RXENABLE
| MCFUART_UCR_TXENABLE
;
715 mcfrs_setsignals(info
, 1, -1);
716 local_irq_restore(flags
);
720 static void mcfrs_flush_chars(struct tty_struct
*tty
)
722 volatile unsigned char *uartp
;
723 struct mcf_serial
*info
= (struct mcf_serial
*)tty
->driver_data
;
726 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_flush_chars"))
729 uartp
= (volatile unsigned char *) info
->addr
;
732 * re-enable receiver interrupt
734 local_irq_save(flags
);
735 if ((!(info
->imr
& MCFUART_UIR_RXREADY
)) &&
736 (info
->flags
& ASYNC_INITIALIZED
) ) {
737 info
->imr
|= MCFUART_UIR_RXREADY
;
738 uartp
[MCFUART_UIMR
] = info
->imr
;
740 local_irq_restore(flags
);
742 if (info
->xmit_cnt
<= 0 || tty
->stopped
|| tty
->hw_stopped
||
746 /* Enable transmitter */
747 local_irq_save(flags
);
748 info
->imr
|= MCFUART_UIR_TXREADY
;
749 uartp
[MCFUART_UIMR
] = info
->imr
;
750 local_irq_restore(flags
);
753 static int mcfrs_write(struct tty_struct
* tty
,
754 const unsigned char *buf
, int count
)
756 volatile unsigned char *uartp
;
757 struct mcf_serial
*info
= (struct mcf_serial
*)tty
->driver_data
;
762 printk("%s(%d): mcfrs_write(tty=%x,buf=%x,count=%d)\n",
763 __FILE__
, __LINE__
, (int)tty
, (int)buf
, count
);
766 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_write"))
769 if (!tty
|| !info
->xmit_buf
)
772 local_save_flags(flags
);
775 c
= min(count
, (int) min(((int)SERIAL_XMIT_SIZE
) - info
->xmit_cnt
- 1,
776 ((int)SERIAL_XMIT_SIZE
) - info
->xmit_head
));
777 local_irq_restore(flags
);
782 memcpy(info
->xmit_buf
+ info
->xmit_head
, buf
, c
);
785 info
->xmit_head
= (info
->xmit_head
+ c
) & (SERIAL_XMIT_SIZE
-1);
787 local_irq_restore(flags
);
796 info
->imr
|= MCFUART_UIR_TXREADY
;
797 uartp
[MCFUART_UIMR
] = info
->imr
;
798 local_irq_restore(flags
);
803 static int mcfrs_write_room(struct tty_struct
*tty
)
805 struct mcf_serial
*info
= (struct mcf_serial
*)tty
->driver_data
;
808 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_write_room"))
810 ret
= SERIAL_XMIT_SIZE
- info
->xmit_cnt
- 1;
816 static int mcfrs_chars_in_buffer(struct tty_struct
*tty
)
818 struct mcf_serial
*info
= (struct mcf_serial
*)tty
->driver_data
;
820 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_chars_in_buffer"))
822 return info
->xmit_cnt
;
825 static void mcfrs_flush_buffer(struct tty_struct
*tty
)
827 struct mcf_serial
*info
= (struct mcf_serial
*)tty
->driver_data
;
830 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_flush_buffer"))
833 local_irq_save(flags
);
834 info
->xmit_cnt
= info
->xmit_head
= info
->xmit_tail
= 0;
835 local_irq_restore(flags
);
841 * ------------------------------------------------------------
844 * This routine is called by the upper-layer tty layer to signal that
845 * incoming characters should be throttled.
846 * ------------------------------------------------------------
848 static void mcfrs_throttle(struct tty_struct
* tty
)
850 struct mcf_serial
*info
= (struct mcf_serial
*)tty
->driver_data
;
851 #ifdef SERIAL_DEBUG_THROTTLE
854 printk("throttle %s: %d....\n", tty_name(tty
, buf
),
855 tty
->ldisc
.chars_in_buffer(tty
));
858 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_throttle"))
862 info
->x_char
= STOP_CHAR(tty
);
864 /* Turn off RTS line (do this atomic) */
867 static void mcfrs_unthrottle(struct tty_struct
* tty
)
869 struct mcf_serial
*info
= (struct mcf_serial
*)tty
->driver_data
;
870 #ifdef SERIAL_DEBUG_THROTTLE
873 printk("unthrottle %s: %d....\n", tty_name(tty
, buf
),
874 tty
->ldisc
.chars_in_buffer(tty
));
877 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_unthrottle"))
884 info
->x_char
= START_CHAR(tty
);
887 /* Assert RTS line (do this atomic) */
891 * ------------------------------------------------------------
892 * mcfrs_ioctl() and friends
893 * ------------------------------------------------------------
896 static int get_serial_info(struct mcf_serial
* info
,
897 struct serial_struct
* retinfo
)
899 struct serial_struct tmp
;
903 memset(&tmp
, 0, sizeof(tmp
));
904 tmp
.type
= info
->type
;
905 tmp
.line
= info
->line
;
906 tmp
.port
= (unsigned int) info
->addr
;
908 tmp
.flags
= info
->flags
;
909 tmp
.baud_base
= info
->baud_base
;
910 tmp
.close_delay
= info
->close_delay
;
911 tmp
.closing_wait
= info
->closing_wait
;
912 tmp
.custom_divisor
= info
->custom_divisor
;
913 return copy_to_user(retinfo
,&tmp
,sizeof(*retinfo
)) ? -EFAULT
: 0;
916 static int set_serial_info(struct mcf_serial
* info
,
917 struct serial_struct
* new_info
)
919 struct serial_struct new_serial
;
920 struct mcf_serial old_info
;
925 if (copy_from_user(&new_serial
,new_info
,sizeof(new_serial
)))
929 if (!capable(CAP_SYS_ADMIN
)) {
930 if ((new_serial
.baud_base
!= info
->baud_base
) ||
931 (new_serial
.type
!= info
->type
) ||
932 (new_serial
.close_delay
!= info
->close_delay
) ||
933 ((new_serial
.flags
& ~ASYNC_USR_MASK
) !=
934 (info
->flags
& ~ASYNC_USR_MASK
)))
936 info
->flags
= ((info
->flags
& ~ASYNC_USR_MASK
) |
937 (new_serial
.flags
& ASYNC_USR_MASK
));
938 info
->custom_divisor
= new_serial
.custom_divisor
;
946 * OK, past this point, all the error checking has been done.
947 * At this point, we start making changes.....
950 info
->baud_base
= new_serial
.baud_base
;
951 info
->flags
= ((info
->flags
& ~ASYNC_FLAGS
) |
952 (new_serial
.flags
& ASYNC_FLAGS
));
953 info
->type
= new_serial
.type
;
954 info
->close_delay
= new_serial
.close_delay
;
955 info
->closing_wait
= new_serial
.closing_wait
;
958 retval
= startup(info
);
963 * get_lsr_info - get line status register info
965 * Purpose: Let user call ioctl() to get info when the UART physically
966 * is emptied. On bus types like RS485, the transmitter must
967 * release the bus after transmitting. This must be done when
968 * the transmit shift register is empty, not be done when the
969 * transmit holding register is empty. This functionality
970 * allows an RS485 driver to be written in user space.
972 static int get_lsr_info(struct mcf_serial
* info
, unsigned int *value
)
974 volatile unsigned char *uartp
;
976 unsigned char status
;
978 local_irq_save(flags
);
980 status
= (uartp
[MCFUART_USR
] & MCFUART_USR_TXEMPTY
) ? TIOCSER_TEMT
: 0;
981 local_irq_restore(flags
);
983 return put_user(status
,value
);
987 * This routine sends a break character out the serial port.
989 static void send_break( struct mcf_serial
* info
, int duration
)
991 volatile unsigned char *uartp
;
996 set_current_state(TASK_INTERRUPTIBLE
);
999 local_irq_save(flags
);
1000 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDBREAKSTART
;
1001 schedule_timeout(duration
);
1002 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDBREAKSTOP
;
1003 local_irq_restore(flags
);
1006 static int mcfrs_tiocmget(struct tty_struct
*tty
, struct file
*file
)
1008 struct mcf_serial
* info
= (struct mcf_serial
*)tty
->driver_data
;
1010 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_ioctl"))
1012 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1015 return mcfrs_getsignals(info
);
1018 static int mcfrs_tiocmset(struct tty_struct
*tty
, struct file
*file
,
1019 unsigned int set
, unsigned int clear
)
1021 struct mcf_serial
* info
= (struct mcf_serial
*)tty
->driver_data
;
1022 int rts
= -1, dtr
= -1;
1024 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_ioctl"))
1026 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1029 if (set
& TIOCM_RTS
)
1031 if (set
& TIOCM_DTR
)
1033 if (clear
& TIOCM_RTS
)
1035 if (clear
& TIOCM_DTR
)
1038 mcfrs_setsignals(info
, dtr
, rts
);
1043 static int mcfrs_ioctl(struct tty_struct
*tty
, struct file
* file
,
1044 unsigned int cmd
, unsigned long arg
)
1046 struct mcf_serial
* info
= (struct mcf_serial
*)tty
->driver_data
;
1049 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_ioctl"))
1052 if ((cmd
!= TIOCGSERIAL
) && (cmd
!= TIOCSSERIAL
) &&
1053 (cmd
!= TIOCSERCONFIG
) && (cmd
!= TIOCSERGWILD
) &&
1054 (cmd
!= TIOCSERSWILD
) && (cmd
!= TIOCSERGSTRUCT
)) {
1055 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1060 case TCSBRK
: /* SVID version: non-zero arg --> no break */
1061 retval
= tty_check_change(tty
);
1064 tty_wait_until_sent(tty
, 0);
1066 send_break(info
, HZ
/4); /* 1/4 second */
1068 case TCSBRKP
: /* support for POSIX tcsendbreak() */
1069 retval
= tty_check_change(tty
);
1072 tty_wait_until_sent(tty
, 0);
1073 send_break(info
, arg
? arg
*(HZ
/10) : HZ
/4);
1076 if (access_ok(VERIFY_WRITE
, (void *) arg
,
1077 sizeof(struct serial_struct
)))
1078 return get_serial_info(info
,
1079 (struct serial_struct
*) arg
);
1082 return set_serial_info(info
,
1083 (struct serial_struct
*) arg
);
1084 case TIOCSERGETLSR
: /* Get line status register */
1085 if (access_ok(VERIFY_WRITE
, (void *) arg
,
1086 sizeof(unsigned int)))
1087 return get_lsr_info(info
, (unsigned int *) arg
);
1089 case TIOCSERGSTRUCT
:
1090 error
= copy_to_user((struct mcf_serial
*) arg
,
1091 info
, sizeof(struct mcf_serial
));
1099 get_user(val
, (unsigned int *) arg
);
1100 mcf_setpa(MCFPP_PA11
, (val
? 0 : MCFPP_PA11
));
1105 val
= (mcf_getpa() & MCFPP_PA11
) ? 0 : 1;
1106 put_user(val
, (unsigned int *) arg
);
1112 return -ENOIOCTLCMD
;
1117 static void mcfrs_set_termios(struct tty_struct
*tty
, struct ktermios
*old_termios
)
1119 struct mcf_serial
*info
= (struct mcf_serial
*)tty
->driver_data
;
1121 if (tty
->termios
->c_cflag
== old_termios
->c_cflag
)
1124 mcfrs_change_speed(info
);
1126 if ((old_termios
->c_cflag
& CRTSCTS
) &&
1127 !(tty
->termios
->c_cflag
& CRTSCTS
)) {
1128 tty
->hw_stopped
= 0;
1129 mcfrs_setsignals(info
, -1, 1);
1137 * ------------------------------------------------------------
1140 * This routine is called when the serial port gets closed. First, we
1141 * wait for the last remaining data to be sent. Then, we unlink its
1142 * S structure from the interrupt chain if necessary, and we free
1143 * that IRQ if nothing is left in the chain.
1144 * ------------------------------------------------------------
1146 static void mcfrs_close(struct tty_struct
*tty
, struct file
* filp
)
1148 volatile unsigned char *uartp
;
1149 struct mcf_serial
*info
= (struct mcf_serial
*)tty
->driver_data
;
1150 unsigned long flags
;
1152 if (!info
|| serial_paranoia_check(info
, tty
->name
, "mcfrs_close"))
1155 local_irq_save(flags
);
1157 if (tty_hung_up_p(filp
)) {
1158 local_irq_restore(flags
);
1162 #ifdef SERIAL_DEBUG_OPEN
1163 printk("mcfrs_close ttyS%d, count = %d\n", info
->line
, info
->count
);
1165 if ((tty
->count
== 1) && (info
->count
!= 1)) {
1167 * Uh, oh. tty->count is 1, which means that the tty
1168 * structure will be freed. Info->count should always
1169 * be one in these conditions. If it's greater than
1170 * one, we've got real problems, since it means the
1171 * serial port won't be shutdown.
1173 printk("MCFRS: bad serial port count; tty->count is 1, "
1174 "info->count is %d\n", info
->count
);
1177 if (--info
->count
< 0) {
1178 printk("MCFRS: bad serial port count for ttyS%d: %d\n",
1179 info
->line
, info
->count
);
1183 local_irq_restore(flags
);
1186 info
->flags
|= ASYNC_CLOSING
;
1189 * Now we wait for the transmit buffer to clear; and we notify
1190 * the line discipline to only process XON/XOFF characters.
1193 if (info
->closing_wait
!= ASYNC_CLOSING_WAIT_NONE
)
1194 tty_wait_until_sent(tty
, info
->closing_wait
);
1197 * At this point we stop accepting input. To do this, we
1198 * disable the receive line status interrupts, and tell the
1199 * interrupt driver to stop checking the data ready bit in the
1200 * line status register.
1202 info
->imr
&= ~MCFUART_UIR_RXREADY
;
1204 uartp
[MCFUART_UIMR
] = info
->imr
;
1207 /* FIXME: do we need to keep this enabled for console?? */
1208 if (mcfrs_console_inited
&& (mcfrs_console_port
== info
->line
)) {
1209 /* Do not disable the UART */ ;
1213 mcfrs_flush_buffer(tty
);
1214 tty_ldisc_flush(tty
);
1220 if (tty
->ldisc
.num
!= ldiscs
[N_TTY
].num
) {
1221 if (tty
->ldisc
.close
)
1222 (tty
->ldisc
.close
)(tty
);
1223 tty
->ldisc
= ldiscs
[N_TTY
];
1224 tty
->termios
->c_line
= N_TTY
;
1225 if (tty
->ldisc
.open
)
1226 (tty
->ldisc
.open
)(tty
);
1229 if (info
->blocked_open
) {
1230 if (info
->close_delay
) {
1231 msleep_interruptible(jiffies_to_msecs(info
->close_delay
));
1233 wake_up_interruptible(&info
->open_wait
);
1235 info
->flags
&= ~(ASYNC_NORMAL_ACTIVE
|ASYNC_CLOSING
);
1236 wake_up_interruptible(&info
->close_wait
);
1237 local_irq_restore(flags
);
1241 * mcfrs_wait_until_sent() --- wait until the transmitter is empty
1244 mcfrs_wait_until_sent(struct tty_struct
*tty
, int timeout
)
1247 #define MCF5272_FIFO_SIZE 25 /* fifo size + shift reg */
1249 struct mcf_serial
* info
= (struct mcf_serial
*)tty
->driver_data
;
1250 volatile unsigned char *uartp
;
1251 unsigned long orig_jiffies
, fifo_time
, char_time
, fifo_cnt
;
1253 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_wait_until_sent"))
1256 orig_jiffies
= jiffies
;
1259 * Set the check interval to be 1/5 of the approximate time
1260 * to send the entire fifo, and make it at least 1. The check
1261 * interval should also be less than the timeout.
1263 * Note: we have to use pretty tight timings here to satisfy
1268 fifo_time
= (MCF5272_FIFO_SIZE
* HZ
* 10) / info
->baud
;
1269 char_time
= fifo_time
/ 5;
1272 if (timeout
&& timeout
< char_time
)
1273 char_time
= timeout
;
1276 * Clamp the timeout period at 2 * the time to empty the
1277 * fifo. Just to be safe, set the minimum at .5 seconds.
1280 if (fifo_time
< (HZ
/2))
1282 if (!timeout
|| timeout
> fifo_time
)
1283 timeout
= fifo_time
;
1286 * Account for the number of bytes in the UART
1287 * transmitter FIFO plus any byte being shifted out.
1289 uartp
= (volatile unsigned char *) info
->addr
;
1291 fifo_cnt
= (uartp
[MCFUART_UTF
] & MCFUART_UTF_TXB
);
1292 if ((uartp
[MCFUART_USR
] & (MCFUART_USR_TXREADY
|
1293 MCFUART_USR_TXEMPTY
)) ==
1294 MCFUART_USR_TXREADY
)
1298 msleep_interruptible(jiffies_to_msecs(char_time
));
1299 if (signal_pending(current
))
1301 if (timeout
&& time_after(jiffies
, orig_jiffies
+ timeout
))
1307 * For the other coldfire models, assume all data has been sent
1313 * mcfrs_hangup() --- called by tty_hangup() when a hangup is signaled.
1315 void mcfrs_hangup(struct tty_struct
*tty
)
1317 struct mcf_serial
* info
= (struct mcf_serial
*)tty
->driver_data
;
1319 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_hangup"))
1322 mcfrs_flush_buffer(tty
);
1326 info
->flags
&= ~ASYNC_NORMAL_ACTIVE
;
1328 wake_up_interruptible(&info
->open_wait
);
1332 * ------------------------------------------------------------
1333 * mcfrs_open() and friends
1334 * ------------------------------------------------------------
1336 static int block_til_ready(struct tty_struct
*tty
, struct file
* filp
,
1337 struct mcf_serial
*info
)
1339 DECLARE_WAITQUEUE(wait
, current
);
1344 * If the device is in the middle of being closed, then block
1345 * until it's done, and then try again.
1347 if (info
->flags
& ASYNC_CLOSING
) {
1348 interruptible_sleep_on(&info
->close_wait
);
1349 #ifdef SERIAL_DO_RESTART
1350 if (info
->flags
& ASYNC_HUP_NOTIFY
)
1353 return -ERESTARTSYS
;
1360 * If non-blocking mode is set, or the port is not enabled,
1361 * then make the check up front and then exit.
1363 if ((filp
->f_flags
& O_NONBLOCK
) ||
1364 (tty
->flags
& (1 << TTY_IO_ERROR
))) {
1365 info
->flags
|= ASYNC_NORMAL_ACTIVE
;
1369 if (tty
->termios
->c_cflag
& CLOCAL
)
1373 * Block waiting for the carrier detect and the line to become
1374 * free (i.e., not in use by the callout). While we are in
1375 * this loop, info->count is dropped by one, so that
1376 * mcfrs_close() knows when to free things. We restore it upon
1377 * exit, either normal or abnormal.
1380 add_wait_queue(&info
->open_wait
, &wait
);
1381 #ifdef SERIAL_DEBUG_OPEN
1382 printk("block_til_ready before block: ttyS%d, count = %d\n",
1383 info
->line
, info
->count
);
1386 info
->blocked_open
++;
1388 local_irq_disable();
1389 mcfrs_setsignals(info
, 1, 1);
1391 current
->state
= TASK_INTERRUPTIBLE
;
1392 if (tty_hung_up_p(filp
) ||
1393 !(info
->flags
& ASYNC_INITIALIZED
)) {
1394 #ifdef SERIAL_DO_RESTART
1395 if (info
->flags
& ASYNC_HUP_NOTIFY
)
1398 retval
= -ERESTARTSYS
;
1404 if (!(info
->flags
& ASYNC_CLOSING
) &&
1405 (do_clocal
|| (mcfrs_getsignals(info
) & TIOCM_CD
)))
1407 if (signal_pending(current
)) {
1408 retval
= -ERESTARTSYS
;
1411 #ifdef SERIAL_DEBUG_OPEN
1412 printk("block_til_ready blocking: ttyS%d, count = %d\n",
1413 info
->line
, info
->count
);
1417 current
->state
= TASK_RUNNING
;
1418 remove_wait_queue(&info
->open_wait
, &wait
);
1419 if (!tty_hung_up_p(filp
))
1421 info
->blocked_open
--;
1422 #ifdef SERIAL_DEBUG_OPEN
1423 printk("block_til_ready after blocking: ttyS%d, count = %d\n",
1424 info
->line
, info
->count
);
1428 info
->flags
|= ASYNC_NORMAL_ACTIVE
;
1433 * This routine is called whenever a serial port is opened. It
1434 * enables interrupts for a serial port, linking in its structure into
1435 * the IRQ chain. It also performs the serial-specific
1436 * initialization for the tty structure.
1438 int mcfrs_open(struct tty_struct
*tty
, struct file
* filp
)
1440 struct mcf_serial
*info
;
1444 if ((line
< 0) || (line
>= NR_PORTS
))
1446 info
= mcfrs_table
+ line
;
1447 if (serial_paranoia_check(info
, tty
->name
, "mcfrs_open"))
1449 #ifdef SERIAL_DEBUG_OPEN
1450 printk("mcfrs_open %s, count = %d\n", tty
->name
, info
->count
);
1453 tty
->driver_data
= info
;
1457 * Start up serial port
1459 retval
= startup(info
);
1463 retval
= block_til_ready(tty
, filp
, info
);
1465 #ifdef SERIAL_DEBUG_OPEN
1466 printk("mcfrs_open returning after block_til_ready with %d\n",
1472 #ifdef SERIAL_DEBUG_OPEN
1473 printk("mcfrs_open %s successful...\n", tty
->name
);
1479 * Based on the line number set up the internal interrupt stuff.
1481 static void mcfrs_irqinit(struct mcf_serial
*info
)
1483 #if defined(CONFIG_M5272)
1484 volatile unsigned long *icrp
;
1485 volatile unsigned long *portp
;
1486 volatile unsigned char *uartp
;
1489 icrp
= (volatile unsigned long *) (MCF_MBAR
+ MCFSIM_ICR2
);
1491 switch (info
->line
) {
1499 printk("MCFRS: don't know how to handle UART %d interrupt?\n",
1504 /* Enable the output lines for the serial ports */
1505 portp
= (volatile unsigned long *) (MCF_MBAR
+ MCFSIM_PBCNT
);
1506 *portp
= (*portp
& ~0x000000ff) | 0x00000055;
1507 portp
= (volatile unsigned long *) (MCF_MBAR
+ MCFSIM_PDCNT
);
1508 *portp
= (*portp
& ~0x000003fc) | 0x000002a8;
1509 #elif defined(CONFIG_M523x) || defined(CONFIG_M527x) || defined(CONFIG_M528x)
1510 volatile unsigned char *icrp
, *uartp
;
1511 volatile unsigned long *imrp
;
1515 icrp
= (volatile unsigned char *) (MCF_MBAR
+ MCFICM_INTC0
+
1516 MCFINTC_ICR0
+ MCFINT_UART0
+ info
->line
);
1517 *icrp
= 0x30 + info
->line
; /* level 6, line based priority */
1519 imrp
= (volatile unsigned long *) (MCF_MBAR
+ MCFICM_INTC0
+
1521 *imrp
&= ~((1 << (info
->irq
- MCFINT_VECBASE
)) | 1);
1522 #if defined(CONFIG_M527x)
1525 * External Pin Mask Setting & Enable External Pin for Interface
1526 * mrcbis@aliceposta.it
1528 u16
*serpin_enable_mask
;
1529 serpin_enable_mask
= (u16
*) (MCF_IPSBAR
+ MCF_GPIO_PAR_UART
);
1530 if (info
->line
== 0)
1531 *serpin_enable_mask
|= UART0_ENABLE_MASK
;
1532 else if (info
->line
== 1)
1533 *serpin_enable_mask
|= UART1_ENABLE_MASK
;
1534 else if (info
->line
== 2)
1535 *serpin_enable_mask
|= UART2_ENABLE_MASK
;
1538 #if defined(CONFIG_M528x)
1539 /* make sure PUAPAR is set for UART0 and UART1 */
1540 if (info
->line
< 2) {
1541 volatile unsigned char *portp
= (volatile unsigned char *) (MCF_MBAR
+ MCF5282_GPIO_PUAPAR
);
1542 *portp
|= (0x03 << (info
->line
* 2));
1545 #elif defined(CONFIG_M520x)
1546 volatile unsigned char *icrp
, *uartp
;
1547 volatile unsigned long *imrp
;
1551 icrp
= (volatile unsigned char *) (MCF_MBAR
+ MCFICM_INTC0
+
1552 MCFINTC_ICR0
+ MCFINT_UART0
+ info
->line
);
1555 imrp
= (volatile unsigned long *) (MCF_MBAR
+ MCFICM_INTC0
+
1557 *imrp
&= ~((1 << (info
->irq
- MCFINT_VECBASE
)) | 1);
1558 if (info
->line
< 2) {
1559 unsigned short *uart_par
;
1560 uart_par
= (unsigned short *)(MCF_IPSBAR
+ MCF_GPIO_PAR_UART
);
1561 if (info
->line
== 0)
1562 *uart_par
|= MCF_GPIO_PAR_UART_PAR_UTXD0
1563 | MCF_GPIO_PAR_UART_PAR_URXD0
;
1564 else if (info
->line
== 1)
1565 *uart_par
|= MCF_GPIO_PAR_UART_PAR_UTXD1
1566 | MCF_GPIO_PAR_UART_PAR_URXD1
;
1567 } else if (info
->line
== 2) {
1568 unsigned char *feci2c_par
;
1569 feci2c_par
= (unsigned char *)(MCF_IPSBAR
+ MCF_GPIO_PAR_FECI2C
);
1570 *feci2c_par
&= ~0x0F;
1571 *feci2c_par
|= MCF_GPIO_PAR_FECI2C_PAR_SCL_UTXD2
1572 | MCF_GPIO_PAR_FECI2C_PAR_SDA_URXD2
;
1574 #elif defined(CONFIG_M532x)
1575 volatile unsigned char *uartp
;
1577 switch (info
->line
) {
1579 MCF_INTC0_ICR26
= 0x3;
1580 MCF_INTC0_CIMR
= 26;
1581 /* GPIO initialization */
1582 MCF_GPIO_PAR_UART
|= 0x000F;
1585 MCF_INTC0_ICR27
= 0x3;
1586 MCF_INTC0_CIMR
= 27;
1587 /* GPIO initialization */
1588 MCF_GPIO_PAR_UART
|= 0x0FF0;
1591 MCF_INTC0_ICR28
= 0x3;
1592 MCF_INTC0_CIMR
= 28;
1593 /* GPIOs also must be initalized, depends on board */
1597 volatile unsigned char *icrp
, *uartp
;
1599 switch (info
->line
) {
1601 icrp
= (volatile unsigned char *) (MCF_MBAR
+ MCFSIM_UART1ICR
);
1602 *icrp
= /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6
|
1604 mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART1
);
1607 icrp
= (volatile unsigned char *) (MCF_MBAR
+ MCFSIM_UART2ICR
);
1608 *icrp
= /*MCFSIM_ICR_AUTOVEC |*/ MCFSIM_ICR_LEVEL6
|
1610 mcf_setimr(mcf_getimr() & ~MCFSIM_IMR_UART2
);
1613 printk("MCFRS: don't know how to handle UART %d interrupt?\n",
1619 uartp
[MCFUART_UIVR
] = info
->irq
;
1622 /* Clear mask, so no surprise interrupts. */
1623 uartp
[MCFUART_UIMR
] = 0;
1625 if (request_irq(info
->irq
, mcfrs_interrupt
, IRQF_DISABLED
,
1626 "ColdFire UART", NULL
)) {
1627 printk("MCFRS: Unable to attach ColdFire UART %d interrupt "
1628 "vector=%d\n", info
->line
, info
->irq
);
1635 char *mcfrs_drivername
= "ColdFire internal UART serial driver version 1.00\n";
1639 * Serial stats reporting...
1641 int mcfrs_readproc(char *page
, char **start
, off_t off
, int count
,
1642 int *eof
, void *data
)
1644 struct mcf_serial
*info
;
1648 len
= sprintf(page
, mcfrs_drivername
);
1649 for (i
= 0; (i
< NR_PORTS
); i
++) {
1650 info
= &mcfrs_table
[i
];
1651 len
+= sprintf((page
+ len
), "%d: port:%x irq=%d baud:%d ",
1652 i
, (unsigned int) info
->addr
, info
->irq
, info
->baud
);
1653 if (info
->stats
.rx
|| info
->stats
.tx
)
1654 len
+= sprintf((page
+ len
), "tx:%d rx:%d ",
1655 info
->stats
.tx
, info
->stats
.rx
);
1656 if (info
->stats
.rxframing
)
1657 len
+= sprintf((page
+ len
), "fe:%d ",
1658 info
->stats
.rxframing
);
1659 if (info
->stats
.rxparity
)
1660 len
+= sprintf((page
+ len
), "pe:%d ",
1661 info
->stats
.rxparity
);
1662 if (info
->stats
.rxbreak
)
1663 len
+= sprintf((page
+ len
), "brk:%d ",
1664 info
->stats
.rxbreak
);
1665 if (info
->stats
.rxoverrun
)
1666 len
+= sprintf((page
+ len
), "oe:%d ",
1667 info
->stats
.rxoverrun
);
1669 str
[0] = str
[1] = 0;
1670 if ((sigs
= mcfrs_getsignals(info
))) {
1671 if (sigs
& TIOCM_RTS
)
1672 strcat(str
, "|RTS");
1673 if (sigs
& TIOCM_CTS
)
1674 strcat(str
, "|CTS");
1675 if (sigs
& TIOCM_DTR
)
1676 strcat(str
, "|DTR");
1677 if (sigs
& TIOCM_CD
)
1681 len
+= sprintf((page
+ len
), "%s\n", &str
[1]);
1688 /* Finally, routines used to initialize the serial driver. */
1690 static void show_serial_version(void)
1692 printk(mcfrs_drivername
);
1695 static const struct tty_operations mcfrs_ops
= {
1697 .close
= mcfrs_close
,
1698 .write
= mcfrs_write
,
1699 .flush_chars
= mcfrs_flush_chars
,
1700 .write_room
= mcfrs_write_room
,
1701 .chars_in_buffer
= mcfrs_chars_in_buffer
,
1702 .flush_buffer
= mcfrs_flush_buffer
,
1703 .ioctl
= mcfrs_ioctl
,
1704 .throttle
= mcfrs_throttle
,
1705 .unthrottle
= mcfrs_unthrottle
,
1706 .set_termios
= mcfrs_set_termios
,
1708 .start
= mcfrs_start
,
1709 .hangup
= mcfrs_hangup
,
1710 .read_proc
= mcfrs_readproc
,
1711 .wait_until_sent
= mcfrs_wait_until_sent
,
1712 .tiocmget
= mcfrs_tiocmget
,
1713 .tiocmset
= mcfrs_tiocmset
,
1716 /* mcfrs_init inits the driver */
1720 struct mcf_serial
*info
;
1721 unsigned long flags
;
1724 /* Setup base handler, and timer table. */
1726 init_timer(&mcfrs_timer_struct
);
1727 mcfrs_timer_struct
.function
= mcfrs_timer
;
1728 mcfrs_timer_struct
.data
= 0;
1729 mcfrs_timer_struct
.expires
= jiffies
+ HZ
/25;
1730 add_timer(&mcfrs_timer_struct
);
1731 mcfrs_ppstatus
= mcf_getppdata() & (MCFPP_DCD0
| MCFPP_DCD1
);
1733 mcfrs_serial_driver
= alloc_tty_driver(NR_PORTS
);
1734 if (!mcfrs_serial_driver
)
1737 show_serial_version();
1739 /* Initialize the tty_driver structure */
1740 mcfrs_serial_driver
->owner
= THIS_MODULE
;
1741 mcfrs_serial_driver
->name
= "ttyS";
1742 mcfrs_serial_driver
->driver_name
= "mcfserial";
1743 mcfrs_serial_driver
->major
= TTY_MAJOR
;
1744 mcfrs_serial_driver
->minor_start
= 64;
1745 mcfrs_serial_driver
->type
= TTY_DRIVER_TYPE_SERIAL
;
1746 mcfrs_serial_driver
->subtype
= SERIAL_TYPE_NORMAL
;
1747 mcfrs_serial_driver
->init_termios
= tty_std_termios
;
1749 mcfrs_serial_driver
->init_termios
.c_cflag
=
1750 mcfrs_console_cbaud
| CS8
| CREAD
| HUPCL
| CLOCAL
;
1751 mcfrs_serial_driver
->flags
= TTY_DRIVER_REAL_RAW
;
1753 tty_set_operations(mcfrs_serial_driver
, &mcfrs_ops
);
1755 if (tty_register_driver(mcfrs_serial_driver
)) {
1756 printk("MCFRS: Couldn't register serial driver\n");
1757 put_tty_driver(mcfrs_serial_driver
);
1761 local_irq_save(flags
);
1764 * Configure all the attached serial ports.
1766 for (i
= 0, info
= mcfrs_table
; (i
< NR_PORTS
); i
++, info
++) {
1767 info
->magic
= SERIAL_MAGIC
;
1770 info
->custom_divisor
= 16;
1771 info
->close_delay
= 50;
1772 info
->closing_wait
= 3000;
1776 info
->blocked_open
= 0;
1777 INIT_WORK(&info
->tqueue
, mcfrs_offintr
);
1778 INIT_WORK(&info
->tqueue_hangup
, do_serial_hangup
);
1779 init_waitqueue_head(&info
->open_wait
);
1780 init_waitqueue_head(&info
->close_wait
);
1783 mcfrs_setsignals(info
, 0, 0);
1784 mcfrs_irqinit(info
);
1786 printk("ttyS%d at 0x%04x (irq = %d)", info
->line
,
1787 (unsigned int) info
->addr
, info
->irq
);
1788 printk(" is a builtin ColdFire UART\n");
1791 local_irq_restore(flags
);
1795 module_init(mcfrs_init
);
1797 /****************************************************************************/
1798 /* Serial Console */
1799 /****************************************************************************/
1802 * Quick and dirty UART initialization, for console output.
1805 void mcfrs_init_console(void)
1807 volatile unsigned char *uartp
;
1811 * Reset UART, get it into known state...
1813 uartp
= (volatile unsigned char *) (MCF_MBAR
+
1814 (mcfrs_console_port
? MCFUART_BASE2
: MCFUART_BASE1
));
1816 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDRESETRX
; /* reset RX */
1817 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDRESETTX
; /* reset TX */
1818 uartp
[MCFUART_UCR
] = MCFUART_UCR_CMDRESETMRPTR
; /* reset MR pointer */
1821 * Set port for defined baud , 8 data bits, 1 stop bit, no parity.
1823 uartp
[MCFUART_UMR
] = MCFUART_MR1_PARITYNONE
| MCFUART_MR1_CS8
;
1824 uartp
[MCFUART_UMR
] = MCFUART_MR2_STOP1
;
1829 * For the MCF5272, also compute the baudrate fraction.
1831 int fraction
= MCF_BUSCLK
- (clk
* 32 * mcfrs_console_baud
);
1833 fraction
/= (32 * mcfrs_console_baud
);
1834 uartp
[MCFUART_UFPD
] = (fraction
& 0xf); /* set fraction */
1835 clk
= (MCF_BUSCLK
/ mcfrs_console_baud
) / 32;
1838 clk
= ((MCF_BUSCLK
/ mcfrs_console_baud
) + 16) / 32; /* set baud */
1841 uartp
[MCFUART_UBG1
] = (clk
& 0xff00) >> 8; /* set msb baud */
1842 uartp
[MCFUART_UBG2
] = (clk
& 0xff); /* set lsb baud */
1843 uartp
[MCFUART_UCSR
] = MCFUART_UCSR_RXCLKTIMER
| MCFUART_UCSR_TXCLKTIMER
;
1844 uartp
[MCFUART_UCR
] = MCFUART_UCR_RXENABLE
| MCFUART_UCR_TXENABLE
;
1846 mcfrs_console_inited
++;
1852 * Setup for console. Argument comes from the boot command line.
1855 int mcfrs_console_setup(struct console
*cp
, char *arg
)
1857 int i
, n
= CONSOLE_BAUD_RATE
;
1862 if (!strncmp(cp
->name
, "ttyS", 4))
1863 mcfrs_console_port
= cp
->index
;
1864 else if (!strncmp(cp
->name
, "cua", 3))
1865 mcfrs_console_port
= cp
->index
;
1870 n
= simple_strtoul(arg
,NULL
,0);
1871 for (i
= 0; i
< MCFRS_BAUD_TABLE_SIZE
; i
++)
1872 if (mcfrs_baud_table
[i
] == n
)
1874 if (i
< MCFRS_BAUD_TABLE_SIZE
) {
1875 mcfrs_console_baud
= n
;
1876 mcfrs_console_cbaud
= 0;
1878 mcfrs_console_cbaud
|= CBAUDEX
;
1881 mcfrs_console_cbaud
|= i
;
1883 mcfrs_init_console(); /* make sure baud rate changes */
1888 static struct tty_driver
*mcfrs_console_device(struct console
*c
, int *index
)
1891 return mcfrs_serial_driver
;
1896 * Output a single character, using UART polled mode.
1897 * This is used for console output.
1900 int mcfrs_put_char(char ch
)
1902 volatile unsigned char *uartp
;
1903 unsigned long flags
;
1906 uartp
= (volatile unsigned char *) (MCF_MBAR
+
1907 (mcfrs_console_port
? MCFUART_BASE2
: MCFUART_BASE1
));
1909 local_irq_save(flags
);
1910 for (i
= 0; (i
< 0x10000); i
++) {
1911 if (uartp
[MCFUART_USR
] & MCFUART_USR_TXREADY
)
1915 uartp
[MCFUART_UTB
] = ch
;
1916 for (i
= 0; (i
< 0x10000); i
++)
1917 if (uartp
[MCFUART_USR
] & MCFUART_USR_TXEMPTY
)
1921 mcfrs_init_console(); /* try and get it back */
1922 local_irq_restore(flags
);
1929 * rs_console_write is registered for printk output.
1932 void mcfrs_console_write(struct console
*cp
, const char *p
, unsigned len
)
1934 if (!mcfrs_console_inited
)
1935 mcfrs_init_console();
1938 mcfrs_put_char('\r');
1939 mcfrs_put_char(*p
++);
1944 * declare our consoles
1947 struct console mcfrs_console
= {
1949 .write
= mcfrs_console_write
,
1950 .device
= mcfrs_console_device
,
1951 .setup
= mcfrs_console_setup
,
1952 .flags
= CON_PRINTBUFFER
,
1956 static int __init
mcfrs_console_init(void)
1958 register_console(&mcfrs_console
);
1962 console_initcall(mcfrs_console_init
);
1964 /****************************************************************************/