2 * Serial driver for the amiga builtin port.
4 * This code was created by taking serial.c version 4.30 from kernel
5 * release 2.3.22, replacing all hardware related stuff with the
6 * corresponding amiga hardware actions, and removing all irrelevant
7 * code. As a consequence, it uses many of the constants and names
8 * associated with the registers and bits of 16550 compatible UARTS -
9 * but only to keep track of status, etc in the state variables. It
10 * was done this was to make it easier to keep the code in line with
11 * (non hardware specific) changes to serial.c.
13 * The port is registered with the tty driver as minor device 64, and
14 * therefore other ports should should only use 65 upwards.
16 * Richard Lucock 28/12/99
18 * Copyright (C) 1991, 1992 Linus Torvalds
19 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
20 * 1998, 1999 Theodore Ts'o
25 * Serial driver configuration section. Here are the various options:
27 * SERIAL_PARANOIA_CHECK
28 * Check the magic number for the async_structure where
32 #include <linux/delay.h>
34 #undef SERIAL_PARANOIA_CHECK
35 #define SERIAL_DO_RESTART
37 /* Set of debugging defines */
39 #undef SERIAL_DEBUG_INTR
40 #undef SERIAL_DEBUG_OPEN
41 #undef SERIAL_DEBUG_FLOW
42 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
46 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
47 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
48 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
54 * End of serial driver configuration section.
57 #include <linux/module.h>
59 #include <linux/types.h>
60 #include <linux/serial.h>
61 #include <linux/serialP.h>
62 #include <linux/serial_reg.h>
63 static char *serial_version
= "4.30";
65 #include <linux/errno.h>
66 #include <linux/signal.h>
67 #include <linux/sched.h>
68 #include <linux/kernel.h>
69 #include <linux/timer.h>
70 #include <linux/interrupt.h>
71 #include <linux/tty.h>
72 #include <linux/tty_flip.h>
73 #include <linux/console.h>
74 #include <linux/major.h>
75 #include <linux/string.h>
76 #include <linux/fcntl.h>
77 #include <linux/ptrace.h>
78 #include <linux/ioport.h>
80 #include <linux/seq_file.h>
81 #include <linux/slab.h>
82 #include <linux/init.h>
83 #include <linux/bitops.h>
84 #include <linux/platform_device.h>
86 #include <asm/setup.h>
88 #include <asm/system.h>
92 #include <asm/amigahw.h>
93 #include <asm/amigaints.h>
95 #define custom amiga_custom
96 static char *serial_name
= "Amiga-builtin serial driver";
98 static struct tty_driver
*serial_driver
;
100 /* number of characters left in xmit buffer before we ask for more */
101 #define WAKEUP_CHARS 256
103 static unsigned char current_ctl_bits
;
105 static void change_speed(struct tty_struct
*tty
, struct serial_state
*info
,
106 struct ktermios
*old
);
107 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
);
110 static struct serial_state rs_table
[1];
112 #define NR_PORTS ARRAY_SIZE(rs_table)
114 #include <asm/uaccess.h>
116 #define serial_isroot() (capable(CAP_SYS_ADMIN))
119 static inline int serial_paranoia_check(struct serial_state
*info
,
120 char *name
, const char *routine
)
122 #ifdef SERIAL_PARANOIA_CHECK
123 static const char *badmagic
=
124 "Warning: bad magic number for serial struct (%s) in %s\n";
125 static const char *badinfo
=
126 "Warning: null async_struct for (%s) in %s\n";
129 printk(badinfo
, name
, routine
);
132 if (info
->magic
!= SERIAL_MAGIC
) {
133 printk(badmagic
, name
, routine
);
140 /* some serial hardware definitions */
141 #define SDR_OVRUN (1<<15)
142 #define SDR_RBF (1<<14)
143 #define SDR_TBE (1<<13)
144 #define SDR_TSRE (1<<12)
146 #define SERPER_PARENB (1<<15)
148 #define AC_SETCLR (1<<15)
149 #define AC_UARTBRK (1<<11)
151 #define SER_DTR (1<<7)
152 #define SER_RTS (1<<6)
153 #define SER_DCD (1<<5)
154 #define SER_CTS (1<<4)
155 #define SER_DSR (1<<3)
157 static __inline__
void rtsdtr_ctrl(int bits
)
159 ciab
.pra
= ((bits
& (SER_RTS
| SER_DTR
)) ^ (SER_RTS
| SER_DTR
)) | (ciab
.pra
& ~(SER_RTS
| SER_DTR
));
163 * ------------------------------------------------------------
164 * rs_stop() and rs_start()
166 * This routines are called before setting or resetting tty->stopped.
167 * They enable or disable transmitter interrupts, as necessary.
168 * ------------------------------------------------------------
170 static void rs_stop(struct tty_struct
*tty
)
172 struct serial_state
*info
= tty
->driver_data
;
175 if (serial_paranoia_check(info
, tty
->name
, "rs_stop"))
178 local_irq_save(flags
);
179 if (info
->IER
& UART_IER_THRI
) {
180 info
->IER
&= ~UART_IER_THRI
;
181 /* disable Tx interrupt and remove any pending interrupts */
182 custom
.intena
= IF_TBE
;
184 custom
.intreq
= IF_TBE
;
187 local_irq_restore(flags
);
190 static void rs_start(struct tty_struct
*tty
)
192 struct serial_state
*info
= tty
->driver_data
;
195 if (serial_paranoia_check(info
, tty
->name
, "rs_start"))
198 local_irq_save(flags
);
199 if (info
->xmit
.head
!= info
->xmit
.tail
201 && !(info
->IER
& UART_IER_THRI
)) {
202 info
->IER
|= UART_IER_THRI
;
203 custom
.intena
= IF_SETCLR
| IF_TBE
;
205 /* set a pending Tx Interrupt, transmitter should restart now */
206 custom
.intreq
= IF_SETCLR
| IF_TBE
;
209 local_irq_restore(flags
);
213 * ----------------------------------------------------------------------
215 * Here starts the interrupt handling routines. All of the following
216 * subroutines are declared as inline and are folded into
217 * rs_interrupt(). They were separated out for readability's sake.
219 * Note: rs_interrupt() is a "fast" interrupt, which means that it
220 * runs with interrupts turned off. People who may want to modify
221 * rs_interrupt() should try to keep the interrupt handler as fast as
222 * possible. After you are done making modifications, it is not a bad
225 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
227 * and look at the resulting assemble code in serial.s.
229 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
230 * -----------------------------------------------------------------------
233 static void receive_chars(struct serial_state
*info
)
237 struct tty_struct
*tty
= info
->tport
.tty
;
238 unsigned char ch
, flag
;
239 struct async_icount
*icount
;
242 icount
= &info
->icount
;
244 status
= UART_LSR_DR
; /* We obviously have a character! */
245 serdatr
= custom
.serdatr
;
247 custom
.intreq
= IF_RBF
;
250 if((serdatr
& 0x1ff) == 0)
251 status
|= UART_LSR_BI
;
252 if(serdatr
& SDR_OVRUN
)
253 status
|= UART_LSR_OE
;
258 #ifdef SERIAL_DEBUG_INTR
259 printk("DR%02x:%02x...", ch
, status
);
264 * We don't handle parity or frame errors - but I have left
265 * the code in, since I'm not sure that the errors can't be
269 if (status
& (UART_LSR_BI
| UART_LSR_PE
|
270 UART_LSR_FE
| UART_LSR_OE
)) {
272 * For statistics only
274 if (status
& UART_LSR_BI
) {
275 status
&= ~(UART_LSR_FE
| UART_LSR_PE
);
277 } else if (status
& UART_LSR_PE
)
279 else if (status
& UART_LSR_FE
)
281 if (status
& UART_LSR_OE
)
285 * Now check to see if character should be
286 * ignored, and mask off conditions which
289 if (status
& info
->ignore_status_mask
)
292 status
&= info
->read_status_mask
;
294 if (status
& (UART_LSR_BI
)) {
295 #ifdef SERIAL_DEBUG_INTR
296 printk("handling break....");
299 if (info
->tport
.flags
& ASYNC_SAK
)
301 } else if (status
& UART_LSR_PE
)
303 else if (status
& UART_LSR_FE
)
305 if (status
& UART_LSR_OE
) {
307 * Overrun is special, since it's
308 * reported immediately, and doesn't
309 * affect the current character
314 tty_insert_flip_char(tty
, ch
, flag
);
316 tty_insert_flip_char(tty
, 0, TTY_OVERRUN
);
317 tty_flip_buffer_push(tty
);
322 static void transmit_chars(struct serial_state
*info
)
324 custom
.intreq
= IF_TBE
;
327 custom
.serdat
= info
->x_char
| 0x100;
333 if (info
->xmit
.head
== info
->xmit
.tail
334 || info
->tport
.tty
->stopped
335 || info
->tport
.tty
->hw_stopped
) {
336 info
->IER
&= ~UART_IER_THRI
;
337 custom
.intena
= IF_TBE
;
342 custom
.serdat
= info
->xmit
.buf
[info
->xmit
.tail
++] | 0x100;
344 info
->xmit
.tail
= info
->xmit
.tail
& (SERIAL_XMIT_SIZE
-1);
347 if (CIRC_CNT(info
->xmit
.head
,
349 SERIAL_XMIT_SIZE
) < WAKEUP_CHARS
)
350 tty_wakeup(info
->tport
.tty
);
352 #ifdef SERIAL_DEBUG_INTR
355 if (info
->xmit
.head
== info
->xmit
.tail
) {
356 custom
.intena
= IF_TBE
;
358 info
->IER
&= ~UART_IER_THRI
;
362 static void check_modem_status(struct serial_state
*info
)
364 struct tty_port
*port
= &info
->tport
;
365 unsigned char status
= ciab
.pra
& (SER_DCD
| SER_CTS
| SER_DSR
);
366 unsigned char dstatus
;
367 struct async_icount
*icount
;
369 /* Determine bits that have changed */
370 dstatus
= status
^ current_ctl_bits
;
371 current_ctl_bits
= status
;
374 icount
= &info
->icount
;
375 /* update input line counters */
376 if (dstatus
& SER_DSR
)
378 if (dstatus
& SER_DCD
) {
380 #ifdef CONFIG_HARD_PPS
381 if ((port
->flags
& ASYNC_HARDPPS_CD
) &&
386 if (dstatus
& SER_CTS
)
388 wake_up_interruptible(&port
->delta_msr_wait
);
391 if ((port
->flags
& ASYNC_CHECK_CD
) && (dstatus
& SER_DCD
)) {
392 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
393 printk("ttyS%d CD now %s...", info
->line
,
394 (!(status
& SER_DCD
)) ? "on" : "off");
396 if (!(status
& SER_DCD
))
397 wake_up_interruptible(&port
->open_wait
);
399 #ifdef SERIAL_DEBUG_OPEN
400 printk("doing serial hangup...");
403 tty_hangup(port
->tty
);
406 if (port
->flags
& ASYNC_CTS_FLOW
) {
407 if (port
->tty
->hw_stopped
) {
408 if (!(status
& SER_CTS
)) {
409 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
410 printk("CTS tx start...");
412 port
->tty
->hw_stopped
= 0;
413 info
->IER
|= UART_IER_THRI
;
414 custom
.intena
= IF_SETCLR
| IF_TBE
;
416 /* set a pending Tx Interrupt, transmitter should restart now */
417 custom
.intreq
= IF_SETCLR
| IF_TBE
;
419 tty_wakeup(port
->tty
);
423 if ((status
& SER_CTS
)) {
424 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
425 printk("CTS tx stop...");
427 port
->tty
->hw_stopped
= 1;
428 info
->IER
&= ~UART_IER_THRI
;
429 /* disable Tx interrupt and remove any pending interrupts */
430 custom
.intena
= IF_TBE
;
432 custom
.intreq
= IF_TBE
;
439 static irqreturn_t
ser_vbl_int( int irq
, void *data
)
441 /* vbl is just a periodic interrupt we tie into to update modem status */
442 struct serial_state
*info
= data
;
444 * TBD - is it better to unregister from this interrupt or to
445 * ignore it if MSI is clear ?
447 if(info
->IER
& UART_IER_MSI
)
448 check_modem_status(info
);
452 static irqreturn_t
ser_rx_int(int irq
, void *dev_id
)
454 struct serial_state
*info
= dev_id
;
456 #ifdef SERIAL_DEBUG_INTR
457 printk("ser_rx_int...");
460 if (!info
->tport
.tty
)
464 #ifdef SERIAL_DEBUG_INTR
470 static irqreturn_t
ser_tx_int(int irq
, void *dev_id
)
472 struct serial_state
*info
= dev_id
;
474 if (custom
.serdatr
& SDR_TBE
) {
475 #ifdef SERIAL_DEBUG_INTR
476 printk("ser_tx_int...");
479 if (!info
->tport
.tty
)
482 transmit_chars(info
);
483 #ifdef SERIAL_DEBUG_INTR
491 * -------------------------------------------------------------------
492 * Here ends the serial interrupt routines.
493 * -------------------------------------------------------------------
497 * ---------------------------------------------------------------
498 * Low level utility subroutines for the serial driver: routines to
499 * figure out the appropriate timeout for an interrupt chain, routines
500 * to initialize and startup a serial port, and routines to shutdown a
501 * serial port. Useful stuff like that.
502 * ---------------------------------------------------------------
505 static int startup(struct tty_struct
*tty
, struct serial_state
*info
)
507 struct tty_port
*port
= &info
->tport
;
512 page
= get_zeroed_page(GFP_KERNEL
);
516 local_irq_save(flags
);
518 if (port
->flags
& ASYNC_INITIALIZED
) {
526 info
->xmit
.buf
= (unsigned char *) page
;
528 #ifdef SERIAL_DEBUG_OPEN
529 printk("starting up ttys%d ...", info
->line
);
532 /* Clear anything in the input buffer */
534 custom
.intreq
= IF_RBF
;
537 retval
= request_irq(IRQ_AMIGA_VERTB
, ser_vbl_int
, 0, "serial status", info
);
539 if (serial_isroot()) {
540 set_bit(TTY_IO_ERROR
, &tty
->flags
);
546 /* enable both Rx and Tx interrupts */
547 custom
.intena
= IF_SETCLR
| IF_RBF
| IF_TBE
;
549 info
->IER
= UART_IER_MSI
;
551 /* remember current state of the DCD and CTS bits */
552 current_ctl_bits
= ciab
.pra
& (SER_DCD
| SER_CTS
| SER_DSR
);
556 info
->MCR
= SER_DTR
| SER_RTS
;
557 rtsdtr_ctrl(info
->MCR
);
559 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
560 info
->xmit
.head
= info
->xmit
.tail
= 0;
563 * Set up the tty->alt_speed kludge
565 if ((port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_HI
)
566 tty
->alt_speed
= 57600;
567 if ((port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_VHI
)
568 tty
->alt_speed
= 115200;
569 if ((port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_SHI
)
570 tty
->alt_speed
= 230400;
571 if ((port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_WARP
)
572 tty
->alt_speed
= 460800;
575 * and set the speed of the serial port
577 change_speed(tty
, info
, NULL
);
579 port
->flags
|= ASYNC_INITIALIZED
;
580 local_irq_restore(flags
);
584 local_irq_restore(flags
);
589 * This routine will shutdown a serial port; interrupts are disabled, and
590 * DTR is dropped if the hangup on close termio flag is on.
592 static void shutdown(struct tty_struct
*tty
, struct serial_state
*info
)
595 struct serial_state
*state
;
597 if (!(info
->tport
.flags
& ASYNC_INITIALIZED
))
602 #ifdef SERIAL_DEBUG_OPEN
603 printk("Shutting down serial port %d ....\n", info
->line
);
606 local_irq_save(flags
); /* Disable interrupts */
609 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
610 * here so the queue might never be waken up
612 wake_up_interruptible(&info
->tport
.delta_msr_wait
);
615 * Free the IRQ, if necessary
617 free_irq(IRQ_AMIGA_VERTB
, info
);
619 if (info
->xmit
.buf
) {
620 free_page((unsigned long) info
->xmit
.buf
);
621 info
->xmit
.buf
= NULL
;
625 custom
.intena
= IF_RBF
| IF_TBE
;
628 /* disable break condition */
629 custom
.adkcon
= AC_UARTBRK
;
632 if (tty
->termios
->c_cflag
& HUPCL
)
633 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
634 rtsdtr_ctrl(info
->MCR
);
636 set_bit(TTY_IO_ERROR
, &tty
->flags
);
638 info
->tport
.flags
&= ~ASYNC_INITIALIZED
;
639 local_irq_restore(flags
);
644 * This routine is called to set the UART divisor registers to match
645 * the specified baud rate for a serial port.
647 static void change_speed(struct tty_struct
*tty
, struct serial_state
*info
,
648 struct ktermios
*old_termios
)
650 struct tty_port
*port
= &info
->tport
;
651 int quot
= 0, baud_base
, baud
;
652 unsigned cflag
, cval
= 0;
656 cflag
= tty
->termios
->c_cflag
;
658 /* Byte size is always 8 bits plus parity bit if requested */
661 if (cflag
& CSTOPB
) {
665 if (cflag
& PARENB
) {
666 cval
|= UART_LCR_PARITY
;
669 if (!(cflag
& PARODD
))
670 cval
|= UART_LCR_EPAR
;
673 cval
|= UART_LCR_SPAR
;
676 /* Determine divisor based on baud rate */
677 baud
= tty_get_baud_rate(tty
);
679 baud
= 9600; /* B0 transition handled in rs_set_termios */
680 baud_base
= info
->baud_base
;
681 if (baud
== 38400 && (port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
)
682 quot
= info
->custom_divisor
;
685 /* Special case since 134 is really 134.5 */
686 quot
= (2*baud_base
/ 269);
688 quot
= baud_base
/ baud
;
690 /* If the quotient is zero refuse the change */
691 if (!quot
&& old_termios
) {
692 /* FIXME: Will need updating for new tty in the end */
693 tty
->termios
->c_cflag
&= ~CBAUD
;
694 tty
->termios
->c_cflag
|= (old_termios
->c_cflag
& CBAUD
);
695 baud
= tty_get_baud_rate(tty
);
699 (port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
)
700 quot
= info
->custom_divisor
;
703 /* Special case since 134 is really 134.5 */
704 quot
= (2*baud_base
/ 269);
706 quot
= baud_base
/ baud
;
709 /* As a last resort, if the quotient is zero, default to 9600 bps */
711 quot
= baud_base
/ 9600;
713 info
->timeout
= ((info
->xmit_fifo_size
*HZ
*bits
*quot
) / baud_base
);
714 info
->timeout
+= HZ
/50; /* Add .02 seconds of slop */
716 /* CTS flow control flag and modem status interrupts */
717 info
->IER
&= ~UART_IER_MSI
;
718 if (port
->flags
& ASYNC_HARDPPS_CD
)
719 info
->IER
|= UART_IER_MSI
;
720 if (cflag
& CRTSCTS
) {
721 port
->flags
|= ASYNC_CTS_FLOW
;
722 info
->IER
|= UART_IER_MSI
;
724 port
->flags
&= ~ASYNC_CTS_FLOW
;
726 port
->flags
&= ~ASYNC_CHECK_CD
;
728 port
->flags
|= ASYNC_CHECK_CD
;
729 info
->IER
|= UART_IER_MSI
;
732 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
736 * Set up parity check flag
739 info
->read_status_mask
= UART_LSR_OE
| UART_LSR_DR
;
741 info
->read_status_mask
|= UART_LSR_FE
| UART_LSR_PE
;
742 if (I_BRKINT(tty
) || I_PARMRK(tty
))
743 info
->read_status_mask
|= UART_LSR_BI
;
746 * Characters to ignore
748 info
->ignore_status_mask
= 0;
750 info
->ignore_status_mask
|= UART_LSR_PE
| UART_LSR_FE
;
752 info
->ignore_status_mask
|= UART_LSR_BI
;
754 * If we're ignore parity and break indicators, ignore
755 * overruns too. (For real raw support).
758 info
->ignore_status_mask
|= UART_LSR_OE
;
761 * !!! ignore all characters if CREAD is not set
763 if ((cflag
& CREAD
) == 0)
764 info
->ignore_status_mask
|= UART_LSR_DR
;
765 local_irq_save(flags
);
770 /* Set up the baud rate */
773 /* Enable or disable parity bit */
775 if(cval
& UART_LCR_PARITY
)
776 serper
|= (SERPER_PARENB
);
778 custom
.serper
= serper
;
782 local_irq_restore(flags
);
785 static int rs_put_char(struct tty_struct
*tty
, unsigned char ch
)
787 struct serial_state
*info
;
790 info
= tty
->driver_data
;
792 if (serial_paranoia_check(info
, tty
->name
, "rs_put_char"))
798 local_irq_save(flags
);
799 if (CIRC_SPACE(info
->xmit
.head
,
801 SERIAL_XMIT_SIZE
) == 0) {
802 local_irq_restore(flags
);
806 info
->xmit
.buf
[info
->xmit
.head
++] = ch
;
807 info
->xmit
.head
&= SERIAL_XMIT_SIZE
-1;
808 local_irq_restore(flags
);
812 static void rs_flush_chars(struct tty_struct
*tty
)
814 struct serial_state
*info
= tty
->driver_data
;
817 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_chars"))
820 if (info
->xmit
.head
== info
->xmit
.tail
826 local_irq_save(flags
);
827 info
->IER
|= UART_IER_THRI
;
828 custom
.intena
= IF_SETCLR
| IF_TBE
;
830 /* set a pending Tx Interrupt, transmitter should restart now */
831 custom
.intreq
= IF_SETCLR
| IF_TBE
;
833 local_irq_restore(flags
);
836 static int rs_write(struct tty_struct
* tty
, const unsigned char *buf
, int count
)
839 struct serial_state
*info
= tty
->driver_data
;
842 if (serial_paranoia_check(info
, tty
->name
, "rs_write"))
848 local_irq_save(flags
);
850 c
= CIRC_SPACE_TO_END(info
->xmit
.head
,
858 memcpy(info
->xmit
.buf
+ info
->xmit
.head
, buf
, c
);
859 info
->xmit
.head
= ((info
->xmit
.head
+ c
) &
860 (SERIAL_XMIT_SIZE
-1));
865 local_irq_restore(flags
);
867 if (info
->xmit
.head
!= info
->xmit
.tail
870 && !(info
->IER
& UART_IER_THRI
)) {
871 info
->IER
|= UART_IER_THRI
;
873 custom
.intena
= IF_SETCLR
| IF_TBE
;
875 /* set a pending Tx Interrupt, transmitter should restart now */
876 custom
.intreq
= IF_SETCLR
| IF_TBE
;
878 local_irq_restore(flags
);
883 static int rs_write_room(struct tty_struct
*tty
)
885 struct serial_state
*info
= tty
->driver_data
;
887 if (serial_paranoia_check(info
, tty
->name
, "rs_write_room"))
889 return CIRC_SPACE(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
892 static int rs_chars_in_buffer(struct tty_struct
*tty
)
894 struct serial_state
*info
= tty
->driver_data
;
896 if (serial_paranoia_check(info
, tty
->name
, "rs_chars_in_buffer"))
898 return CIRC_CNT(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
901 static void rs_flush_buffer(struct tty_struct
*tty
)
903 struct serial_state
*info
= tty
->driver_data
;
906 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_buffer"))
908 local_irq_save(flags
);
909 info
->xmit
.head
= info
->xmit
.tail
= 0;
910 local_irq_restore(flags
);
915 * This function is used to send a high-priority XON/XOFF character to
918 static void rs_send_xchar(struct tty_struct
*tty
, char ch
)
920 struct serial_state
*info
= tty
->driver_data
;
923 if (serial_paranoia_check(info
, tty
->name
, "rs_send_char"))
928 /* Make sure transmit interrupts are on */
931 local_irq_save(flags
);
932 if(!(custom
.intenar
& IF_TBE
)) {
933 custom
.intena
= IF_SETCLR
| IF_TBE
;
935 /* set a pending Tx Interrupt, transmitter should restart now */
936 custom
.intreq
= IF_SETCLR
| IF_TBE
;
939 local_irq_restore(flags
);
941 info
->IER
|= UART_IER_THRI
;
946 * ------------------------------------------------------------
949 * This routine is called by the upper-layer tty layer to signal that
950 * incoming characters should be throttled.
951 * ------------------------------------------------------------
953 static void rs_throttle(struct tty_struct
* tty
)
955 struct serial_state
*info
= tty
->driver_data
;
957 #ifdef SERIAL_DEBUG_THROTTLE
960 printk("throttle %s: %d....\n", tty_name(tty
, buf
),
961 tty
->ldisc
.chars_in_buffer(tty
));
964 if (serial_paranoia_check(info
, tty
->name
, "rs_throttle"))
968 rs_send_xchar(tty
, STOP_CHAR(tty
));
970 if (tty
->termios
->c_cflag
& CRTSCTS
)
971 info
->MCR
&= ~SER_RTS
;
973 local_irq_save(flags
);
974 rtsdtr_ctrl(info
->MCR
);
975 local_irq_restore(flags
);
978 static void rs_unthrottle(struct tty_struct
* tty
)
980 struct serial_state
*info
= tty
->driver_data
;
982 #ifdef SERIAL_DEBUG_THROTTLE
985 printk("unthrottle %s: %d....\n", tty_name(tty
, buf
),
986 tty
->ldisc
.chars_in_buffer(tty
));
989 if (serial_paranoia_check(info
, tty
->name
, "rs_unthrottle"))
996 rs_send_xchar(tty
, START_CHAR(tty
));
998 if (tty
->termios
->c_cflag
& CRTSCTS
)
999 info
->MCR
|= SER_RTS
;
1000 local_irq_save(flags
);
1001 rtsdtr_ctrl(info
->MCR
);
1002 local_irq_restore(flags
);
1006 * ------------------------------------------------------------
1007 * rs_ioctl() and friends
1008 * ------------------------------------------------------------
1011 static int get_serial_info(struct serial_state
*state
,
1012 struct serial_struct __user
* retinfo
)
1014 struct serial_struct tmp
;
1018 memset(&tmp
, 0, sizeof(tmp
));
1020 tmp
.type
= state
->type
;
1021 tmp
.line
= state
->line
;
1022 tmp
.port
= state
->port
;
1023 tmp
.irq
= state
->irq
;
1024 tmp
.flags
= state
->tport
.flags
;
1025 tmp
.xmit_fifo_size
= state
->xmit_fifo_size
;
1026 tmp
.baud_base
= state
->baud_base
;
1027 tmp
.close_delay
= state
->tport
.close_delay
;
1028 tmp
.closing_wait
= state
->tport
.closing_wait
;
1029 tmp
.custom_divisor
= state
->custom_divisor
;
1031 if (copy_to_user(retinfo
,&tmp
,sizeof(*retinfo
)))
1036 static int set_serial_info(struct tty_struct
*tty
, struct serial_state
*state
,
1037 struct serial_struct __user
* new_info
)
1039 struct tty_port
*port
= &state
->tport
;
1040 struct serial_struct new_serial
;
1044 if (copy_from_user(&new_serial
,new_info
,sizeof(new_serial
)))
1048 change_spd
= ((new_serial
.flags
^ port
->flags
) & ASYNC_SPD_MASK
) ||
1049 new_serial
.custom_divisor
!= state
->custom_divisor
;
1050 if (new_serial
.irq
!= state
->irq
|| new_serial
.port
!= state
->port
||
1051 new_serial
.xmit_fifo_size
!= state
->xmit_fifo_size
) {
1056 if (!serial_isroot()) {
1057 if ((new_serial
.baud_base
!= state
->baud_base
) ||
1058 (new_serial
.close_delay
!= port
->close_delay
) ||
1059 (new_serial
.xmit_fifo_size
!= state
->xmit_fifo_size
) ||
1060 ((new_serial
.flags
& ~ASYNC_USR_MASK
) !=
1061 (port
->flags
& ~ASYNC_USR_MASK
)))
1063 port
->flags
= ((port
->flags
& ~ASYNC_USR_MASK
) |
1064 (new_serial
.flags
& ASYNC_USR_MASK
));
1065 state
->custom_divisor
= new_serial
.custom_divisor
;
1066 goto check_and_exit
;
1069 if (new_serial
.baud_base
< 9600) {
1075 * OK, past this point, all the error checking has been done.
1076 * At this point, we start making changes.....
1079 state
->baud_base
= new_serial
.baud_base
;
1080 port
->flags
= ((port
->flags
& ~ASYNC_FLAGS
) |
1081 (new_serial
.flags
& ASYNC_FLAGS
));
1082 state
->custom_divisor
= new_serial
.custom_divisor
;
1083 port
->close_delay
= new_serial
.close_delay
* HZ
/100;
1084 port
->closing_wait
= new_serial
.closing_wait
* HZ
/100;
1085 tty
->low_latency
= (port
->flags
& ASYNC_LOW_LATENCY
) ? 1 : 0;
1088 if (port
->flags
& ASYNC_INITIALIZED
) {
1090 if ((port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_HI
)
1091 tty
->alt_speed
= 57600;
1092 if ((port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_VHI
)
1093 tty
->alt_speed
= 115200;
1094 if ((port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_SHI
)
1095 tty
->alt_speed
= 230400;
1096 if ((port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_WARP
)
1097 tty
->alt_speed
= 460800;
1098 change_speed(tty
, state
, NULL
);
1101 retval
= startup(tty
, state
);
1108 * get_lsr_info - get line status register info
1110 * Purpose: Let user call ioctl() to get info when the UART physically
1111 * is emptied. On bus types like RS485, the transmitter must
1112 * release the bus after transmitting. This must be done when
1113 * the transmit shift register is empty, not be done when the
1114 * transmit holding register is empty. This functionality
1115 * allows an RS485 driver to be written in user space.
1117 static int get_lsr_info(struct serial_state
*info
, unsigned int __user
*value
)
1119 unsigned char status
;
1120 unsigned int result
;
1121 unsigned long flags
;
1123 local_irq_save(flags
);
1124 status
= custom
.serdatr
;
1126 local_irq_restore(flags
);
1127 result
= ((status
& SDR_TSRE
) ? TIOCSER_TEMT
: 0);
1128 if (copy_to_user(value
, &result
, sizeof(int)))
1134 static int rs_tiocmget(struct tty_struct
*tty
)
1136 struct serial_state
*info
= tty
->driver_data
;
1137 unsigned char control
, status
;
1138 unsigned long flags
;
1140 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1142 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1145 control
= info
->MCR
;
1146 local_irq_save(flags
);
1148 local_irq_restore(flags
);
1149 return ((control
& SER_RTS
) ? TIOCM_RTS
: 0)
1150 | ((control
& SER_DTR
) ? TIOCM_DTR
: 0)
1151 | (!(status
& SER_DCD
) ? TIOCM_CAR
: 0)
1152 | (!(status
& SER_DSR
) ? TIOCM_DSR
: 0)
1153 | (!(status
& SER_CTS
) ? TIOCM_CTS
: 0);
1156 static int rs_tiocmset(struct tty_struct
*tty
, unsigned int set
,
1159 struct serial_state
*info
= tty
->driver_data
;
1160 unsigned long flags
;
1162 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1164 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1167 local_irq_save(flags
);
1168 if (set
& TIOCM_RTS
)
1169 info
->MCR
|= SER_RTS
;
1170 if (set
& TIOCM_DTR
)
1171 info
->MCR
|= SER_DTR
;
1172 if (clear
& TIOCM_RTS
)
1173 info
->MCR
&= ~SER_RTS
;
1174 if (clear
& TIOCM_DTR
)
1175 info
->MCR
&= ~SER_DTR
;
1176 rtsdtr_ctrl(info
->MCR
);
1177 local_irq_restore(flags
);
1182 * rs_break() --- routine which turns the break handling on or off
1184 static int rs_break(struct tty_struct
*tty
, int break_state
)
1186 struct serial_state
*info
= tty
->driver_data
;
1187 unsigned long flags
;
1189 if (serial_paranoia_check(info
, tty
->name
, "rs_break"))
1192 local_irq_save(flags
);
1193 if (break_state
== -1)
1194 custom
.adkcon
= AC_SETCLR
| AC_UARTBRK
;
1196 custom
.adkcon
= AC_UARTBRK
;
1198 local_irq_restore(flags
);
1203 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1204 * Return: write counters to the user passed counter struct
1205 * NB: both 1->0 and 0->1 transitions are counted except for
1206 * RI where only 0->1 is counted.
1208 static int rs_get_icount(struct tty_struct
*tty
,
1209 struct serial_icounter_struct
*icount
)
1211 struct serial_state
*info
= tty
->driver_data
;
1212 struct async_icount cnow
;
1213 unsigned long flags
;
1215 local_irq_save(flags
);
1216 cnow
= info
->icount
;
1217 local_irq_restore(flags
);
1218 icount
->cts
= cnow
.cts
;
1219 icount
->dsr
= cnow
.dsr
;
1220 icount
->rng
= cnow
.rng
;
1221 icount
->dcd
= cnow
.dcd
;
1222 icount
->rx
= cnow
.rx
;
1223 icount
->tx
= cnow
.tx
;
1224 icount
->frame
= cnow
.frame
;
1225 icount
->overrun
= cnow
.overrun
;
1226 icount
->parity
= cnow
.parity
;
1227 icount
->brk
= cnow
.brk
;
1228 icount
->buf_overrun
= cnow
.buf_overrun
;
1233 static int rs_ioctl(struct tty_struct
*tty
,
1234 unsigned int cmd
, unsigned long arg
)
1236 struct serial_state
*info
= tty
->driver_data
;
1237 struct async_icount cprev
, cnow
; /* kernel counter temps */
1238 void __user
*argp
= (void __user
*)arg
;
1239 unsigned long flags
;
1241 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1244 if ((cmd
!= TIOCGSERIAL
) && (cmd
!= TIOCSSERIAL
) &&
1245 (cmd
!= TIOCSERCONFIG
) && (cmd
!= TIOCSERGSTRUCT
) &&
1246 (cmd
!= TIOCMIWAIT
) && (cmd
!= TIOCGICOUNT
)) {
1247 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1253 return get_serial_info(info
, argp
);
1255 return set_serial_info(tty
, info
, argp
);
1259 case TIOCSERGETLSR
: /* Get line status register */
1260 return get_lsr_info(info
, argp
);
1262 case TIOCSERGSTRUCT
:
1263 if (copy_to_user(argp
,
1264 info
, sizeof(struct serial_state
)))
1269 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1270 * - mask passed in arg for lines of interest
1271 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1272 * Caller should use TIOCGICOUNT to see which one it was
1275 local_irq_save(flags
);
1276 /* note the counters on entry */
1277 cprev
= info
->icount
;
1278 local_irq_restore(flags
);
1280 interruptible_sleep_on(&info
->tport
.delta_msr_wait
);
1281 /* see if a signal did it */
1282 if (signal_pending(current
))
1283 return -ERESTARTSYS
;
1284 local_irq_save(flags
);
1285 cnow
= info
->icount
; /* atomic copy */
1286 local_irq_restore(flags
);
1287 if (cnow
.rng
== cprev
.rng
&& cnow
.dsr
== cprev
.dsr
&&
1288 cnow
.dcd
== cprev
.dcd
&& cnow
.cts
== cprev
.cts
)
1289 return -EIO
; /* no change => error */
1290 if ( ((arg
& TIOCM_RNG
) && (cnow
.rng
!= cprev
.rng
)) ||
1291 ((arg
& TIOCM_DSR
) && (cnow
.dsr
!= cprev
.dsr
)) ||
1292 ((arg
& TIOCM_CD
) && (cnow
.dcd
!= cprev
.dcd
)) ||
1293 ((arg
& TIOCM_CTS
) && (cnow
.cts
!= cprev
.cts
)) ) {
1302 /* "setserial -W" is called in Debian boot */
1303 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1307 return -ENOIOCTLCMD
;
1312 static void rs_set_termios(struct tty_struct
*tty
, struct ktermios
*old_termios
)
1314 struct serial_state
*info
= tty
->driver_data
;
1315 unsigned long flags
;
1316 unsigned int cflag
= tty
->termios
->c_cflag
;
1318 change_speed(tty
, info
, old_termios
);
1320 /* Handle transition to B0 status */
1321 if ((old_termios
->c_cflag
& CBAUD
) &&
1323 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
1324 local_irq_save(flags
);
1325 rtsdtr_ctrl(info
->MCR
);
1326 local_irq_restore(flags
);
1329 /* Handle transition away from B0 status */
1330 if (!(old_termios
->c_cflag
& CBAUD
) &&
1332 info
->MCR
|= SER_DTR
;
1333 if (!(tty
->termios
->c_cflag
& CRTSCTS
) ||
1334 !test_bit(TTY_THROTTLED
, &tty
->flags
)) {
1335 info
->MCR
|= SER_RTS
;
1337 local_irq_save(flags
);
1338 rtsdtr_ctrl(info
->MCR
);
1339 local_irq_restore(flags
);
1342 /* Handle turning off CRTSCTS */
1343 if ((old_termios
->c_cflag
& CRTSCTS
) &&
1344 !(tty
->termios
->c_cflag
& CRTSCTS
)) {
1345 tty
->hw_stopped
= 0;
1351 * No need to wake up processes in open wait, since they
1352 * sample the CLOCAL flag once, and don't recheck it.
1353 * XXX It's not clear whether the current behavior is correct
1354 * or not. Hence, this may change.....
1356 if (!(old_termios
->c_cflag
& CLOCAL
) &&
1357 (tty
->termios
->c_cflag
& CLOCAL
))
1358 wake_up_interruptible(&info
->open_wait
);
1363 * ------------------------------------------------------------
1366 * This routine is called when the serial port gets closed. First, we
1367 * wait for the last remaining data to be sent. Then, we unlink its
1368 * async structure from the interrupt chain if necessary, and we free
1369 * that IRQ if nothing is left in the chain.
1370 * ------------------------------------------------------------
1372 static void rs_close(struct tty_struct
*tty
, struct file
* filp
)
1374 struct serial_state
*state
= tty
->driver_data
;
1375 struct tty_port
*port
= &state
->tport
;
1376 unsigned long flags
;
1378 if (!state
|| serial_paranoia_check(state
, tty
->name
, "rs_close"))
1381 local_irq_save(flags
);
1383 if (tty_hung_up_p(filp
)) {
1384 DBG_CNT("before DEC-hung");
1385 local_irq_restore(flags
);
1389 #ifdef SERIAL_DEBUG_OPEN
1390 printk("rs_close ttys%d, count = %d\n", state
->line
, port
->count
);
1392 if ((tty
->count
== 1) && (port
->count
!= 1)) {
1394 * Uh, oh. tty->count is 1, which means that the tty
1395 * structure will be freed. port->count should always
1396 * be one in these conditions. If it's greater than
1397 * one, we've got real problems, since it means the
1398 * serial port won't be shutdown.
1400 printk("rs_close: bad serial port count; tty->count is 1, "
1401 "port->count is %d\n", state
->tport
.count
);
1404 if (--port
->count
< 0) {
1405 printk("rs_close: bad serial port count for ttys%d: %d\n",
1406 state
->line
, port
->count
);
1410 DBG_CNT("before DEC-2");
1411 local_irq_restore(flags
);
1414 port
->flags
|= ASYNC_CLOSING
;
1416 * Now we wait for the transmit buffer to clear; and we notify
1417 * the line discipline to only process XON/XOFF characters.
1420 if (port
->closing_wait
!= ASYNC_CLOSING_WAIT_NONE
)
1421 tty_wait_until_sent(tty
, port
->closing_wait
);
1423 * At this point we stop accepting input. To do this, we
1424 * disable the receive line status interrupts, and tell the
1425 * interrupt driver to stop checking the data ready bit in the
1426 * line status register.
1428 state
->read_status_mask
&= ~UART_LSR_DR
;
1429 if (port
->flags
& ASYNC_INITIALIZED
) {
1430 /* disable receive interrupts */
1431 custom
.intena
= IF_RBF
;
1433 /* clear any pending receive interrupt */
1434 custom
.intreq
= IF_RBF
;
1438 * Before we drop DTR, make sure the UART transmitter
1439 * has completely drained; this is especially
1440 * important if there is a transmit FIFO!
1442 rs_wait_until_sent(tty
, state
->timeout
);
1444 shutdown(tty
, state
);
1445 rs_flush_buffer(tty
);
1447 tty_ldisc_flush(tty
);
1450 if (port
->blocked_open
) {
1451 if (port
->close_delay
) {
1452 msleep_interruptible(jiffies_to_msecs(port
->close_delay
));
1454 wake_up_interruptible(&port
->open_wait
);
1456 port
->flags
&= ~(ASYNC_NORMAL_ACTIVE
|ASYNC_CLOSING
);
1457 wake_up_interruptible(&port
->close_wait
);
1458 local_irq_restore(flags
);
1462 * rs_wait_until_sent() --- wait until the transmitter is empty
1464 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
)
1466 struct serial_state
*info
= tty
->driver_data
;
1467 unsigned long orig_jiffies
, char_time
;
1470 if (serial_paranoia_check(info
, tty
->name
, "rs_wait_until_sent"))
1473 if (info
->xmit_fifo_size
== 0)
1474 return; /* Just in case.... */
1476 orig_jiffies
= jiffies
;
1479 * Set the check interval to be 1/5 of the estimated time to
1480 * send a single character, and make it at least 1. The check
1481 * interval should also be less than the timeout.
1483 * Note: we have to use pretty tight timings here to satisfy
1486 char_time
= (info
->timeout
- HZ
/50) / info
->xmit_fifo_size
;
1487 char_time
= char_time
/ 5;
1491 char_time
= min_t(unsigned long, char_time
, timeout
);
1493 * If the transmitter hasn't cleared in twice the approximate
1494 * amount of time to send the entire FIFO, it probably won't
1495 * ever clear. This assumes the UART isn't doing flow
1496 * control, which is currently the case. Hence, if it ever
1497 * takes longer than info->timeout, this is probably due to a
1498 * UART bug of some kind. So, we clamp the timeout parameter at
1501 if (!timeout
|| timeout
> 2*info
->timeout
)
1502 timeout
= 2*info
->timeout
;
1503 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1504 printk("In rs_wait_until_sent(%d) check=%lu...", timeout
, char_time
);
1505 printk("jiff=%lu...", jiffies
);
1507 while(!((lsr
= custom
.serdatr
) & SDR_TSRE
)) {
1508 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1509 printk("serdatr = %d (jiff=%lu)...", lsr
, jiffies
);
1511 msleep_interruptible(jiffies_to_msecs(char_time
));
1512 if (signal_pending(current
))
1514 if (timeout
&& time_after(jiffies
, orig_jiffies
+ timeout
))
1517 __set_current_state(TASK_RUNNING
);
1519 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1520 printk("lsr = %d (jiff=%lu)...done\n", lsr
, jiffies
);
1525 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1527 static void rs_hangup(struct tty_struct
*tty
)
1529 struct serial_state
*info
= tty
->driver_data
;
1531 if (serial_paranoia_check(info
, tty
->name
, "rs_hangup"))
1534 rs_flush_buffer(tty
);
1535 shutdown(tty
, info
);
1536 info
->tport
.count
= 0;
1537 info
->tport
.flags
&= ~ASYNC_NORMAL_ACTIVE
;
1538 info
->tport
.tty
= NULL
;
1539 wake_up_interruptible(&info
->tport
.open_wait
);
1543 * ------------------------------------------------------------
1544 * rs_open() and friends
1545 * ------------------------------------------------------------
1547 static int block_til_ready(struct tty_struct
*tty
, struct file
* filp
,
1548 struct serial_state
*info
)
1550 #ifdef DECLARE_WAITQUEUE
1551 DECLARE_WAITQUEUE(wait
, current
);
1553 struct wait_queue wait
= { current
, NULL
};
1555 struct tty_port
*port
= &info
->tport
;
1557 int do_clocal
= 0, extra_count
= 0;
1558 unsigned long flags
;
1561 * If the device is in the middle of being closed, then block
1562 * until it's done, and then try again.
1564 if (tty_hung_up_p(filp
) ||
1565 (port
->flags
& ASYNC_CLOSING
)) {
1566 if (port
->flags
& ASYNC_CLOSING
)
1567 interruptible_sleep_on(&port
->close_wait
);
1568 #ifdef SERIAL_DO_RESTART
1569 return ((port
->flags
& ASYNC_HUP_NOTIFY
) ?
1570 -EAGAIN
: -ERESTARTSYS
);
1577 * If non-blocking mode is set, or the port is not enabled,
1578 * then make the check up front and then exit.
1580 if ((filp
->f_flags
& O_NONBLOCK
) ||
1581 (tty
->flags
& (1 << TTY_IO_ERROR
))) {
1582 port
->flags
|= ASYNC_NORMAL_ACTIVE
;
1586 if (tty
->termios
->c_cflag
& CLOCAL
)
1590 * Block waiting for the carrier detect and the line to become
1591 * free (i.e., not in use by the callout). While we are in
1592 * this loop, port->count is dropped by one, so that
1593 * rs_close() knows when to free things. We restore it upon
1594 * exit, either normal or abnormal.
1597 add_wait_queue(&port
->open_wait
, &wait
);
1598 #ifdef SERIAL_DEBUG_OPEN
1599 printk("block_til_ready before block: ttys%d, count = %d\n",
1600 info
->line
, port
->count
);
1602 local_irq_save(flags
);
1603 if (!tty_hung_up_p(filp
)) {
1607 local_irq_restore(flags
);
1608 port
->blocked_open
++;
1610 local_irq_save(flags
);
1611 if (tty
->termios
->c_cflag
& CBAUD
)
1612 rtsdtr_ctrl(SER_DTR
|SER_RTS
);
1613 local_irq_restore(flags
);
1614 set_current_state(TASK_INTERRUPTIBLE
);
1615 if (tty_hung_up_p(filp
) ||
1616 !(port
->flags
& ASYNC_INITIALIZED
)) {
1617 #ifdef SERIAL_DO_RESTART
1618 if (port
->flags
& ASYNC_HUP_NOTIFY
)
1621 retval
= -ERESTARTSYS
;
1627 if (!(port
->flags
& ASYNC_CLOSING
) &&
1628 (do_clocal
|| (!(ciab
.pra
& SER_DCD
)) ))
1630 if (signal_pending(current
)) {
1631 retval
= -ERESTARTSYS
;
1634 #ifdef SERIAL_DEBUG_OPEN
1635 printk("block_til_ready blocking: ttys%d, count = %d\n",
1636 info
->line
, port
->count
);
1642 __set_current_state(TASK_RUNNING
);
1643 remove_wait_queue(&port
->open_wait
, &wait
);
1646 port
->blocked_open
--;
1647 #ifdef SERIAL_DEBUG_OPEN
1648 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1649 info
->line
, port
->count
);
1653 port
->flags
|= ASYNC_NORMAL_ACTIVE
;
1658 * This routine is called whenever a serial port is opened. It
1659 * enables interrupts for a serial port, linking in its async structure into
1660 * the IRQ chain. It also performs the serial-specific
1661 * initialization for the tty structure.
1663 static int rs_open(struct tty_struct
*tty
, struct file
* filp
)
1665 struct serial_state
*info
= rs_table
+ tty
->index
;
1666 struct tty_port
*port
= &info
->tport
;
1671 tty
->driver_data
= info
;
1673 if (serial_paranoia_check(info
, tty
->name
, "rs_open"))
1676 #ifdef SERIAL_DEBUG_OPEN
1677 printk("rs_open %s, count = %d\n", tty
->name
, info
->count
);
1679 tty
->low_latency
= (port
->flags
& ASYNC_LOW_LATENCY
) ? 1 : 0;
1682 * If the port is the middle of closing, bail out now
1684 if (tty_hung_up_p(filp
) ||
1685 (port
->flags
& ASYNC_CLOSING
)) {
1686 if (port
->flags
& ASYNC_CLOSING
)
1687 interruptible_sleep_on(&port
->close_wait
);
1688 #ifdef SERIAL_DO_RESTART
1689 return ((port
->flags
& ASYNC_HUP_NOTIFY
) ?
1690 -EAGAIN
: -ERESTARTSYS
);
1697 * Start up serial port
1699 retval
= startup(tty
, info
);
1704 retval
= block_til_ready(tty
, filp
, info
);
1706 #ifdef SERIAL_DEBUG_OPEN
1707 printk("rs_open returning after block_til_ready with %d\n",
1713 #ifdef SERIAL_DEBUG_OPEN
1714 printk("rs_open %s successful...", tty
->name
);
1720 * /proc fs routines....
1723 static inline void line_info(struct seq_file
*m
, struct serial_state
*state
)
1725 char stat_buf
[30], control
, status
;
1726 unsigned long flags
;
1728 seq_printf(m
, "%d: uart:amiga_builtin",state
->line
);
1730 local_irq_save(flags
);
1732 control
= (state
->tport
.flags
& ASYNC_INITIALIZED
) ? state
->MCR
: status
;
1733 local_irq_restore(flags
);
1737 if(!(control
& SER_RTS
))
1738 strcat(stat_buf
, "|RTS");
1739 if(!(status
& SER_CTS
))
1740 strcat(stat_buf
, "|CTS");
1741 if(!(control
& SER_DTR
))
1742 strcat(stat_buf
, "|DTR");
1743 if(!(status
& SER_DSR
))
1744 strcat(stat_buf
, "|DSR");
1745 if(!(status
& SER_DCD
))
1746 strcat(stat_buf
, "|CD");
1749 seq_printf(m
, " baud:%d", state
->baud_base
/ state
->quot
);
1751 seq_printf(m
, " tx:%d rx:%d", state
->icount
.tx
, state
->icount
.rx
);
1753 if (state
->icount
.frame
)
1754 seq_printf(m
, " fe:%d", state
->icount
.frame
);
1756 if (state
->icount
.parity
)
1757 seq_printf(m
, " pe:%d", state
->icount
.parity
);
1759 if (state
->icount
.brk
)
1760 seq_printf(m
, " brk:%d", state
->icount
.brk
);
1762 if (state
->icount
.overrun
)
1763 seq_printf(m
, " oe:%d", state
->icount
.overrun
);
1766 * Last thing is the RS-232 status lines
1768 seq_printf(m
, " %s\n", stat_buf
+1);
1771 static int rs_proc_show(struct seq_file
*m
, void *v
)
1773 seq_printf(m
, "serinfo:1.0 driver:%s\n", serial_version
);
1774 line_info(m
, &rs_table
[0]);
1778 static int rs_proc_open(struct inode
*inode
, struct file
*file
)
1780 return single_open(file
, rs_proc_show
, NULL
);
1783 static const struct file_operations rs_proc_fops
= {
1784 .owner
= THIS_MODULE
,
1785 .open
= rs_proc_open
,
1787 .llseek
= seq_lseek
,
1788 .release
= single_release
,
1792 * ---------------------------------------------------------------------
1793 * rs_init() and friends
1795 * rs_init() is called at boot-time to initialize the serial driver.
1796 * ---------------------------------------------------------------------
1800 * This routine prints out the appropriate serial driver version
1801 * number, and identifies which options were configured into this
1804 static void show_serial_version(void)
1806 printk(KERN_INFO
"%s version %s\n", serial_name
, serial_version
);
1810 static const struct tty_operations serial_ops
= {
1814 .put_char
= rs_put_char
,
1815 .flush_chars
= rs_flush_chars
,
1816 .write_room
= rs_write_room
,
1817 .chars_in_buffer
= rs_chars_in_buffer
,
1818 .flush_buffer
= rs_flush_buffer
,
1820 .throttle
= rs_throttle
,
1821 .unthrottle
= rs_unthrottle
,
1822 .set_termios
= rs_set_termios
,
1825 .hangup
= rs_hangup
,
1826 .break_ctl
= rs_break
,
1827 .send_xchar
= rs_send_xchar
,
1828 .wait_until_sent
= rs_wait_until_sent
,
1829 .tiocmget
= rs_tiocmget
,
1830 .tiocmset
= rs_tiocmset
,
1831 .get_icount
= rs_get_icount
,
1832 .proc_fops
= &rs_proc_fops
,
1836 * The serial driver boot-time initialization code!
1838 static int __init
amiga_serial_probe(struct platform_device
*pdev
)
1840 unsigned long flags
;
1841 struct serial_state
* state
;
1844 serial_driver
= alloc_tty_driver(NR_PORTS
);
1848 show_serial_version();
1850 /* Initialize the tty_driver structure */
1852 serial_driver
->driver_name
= "amiserial";
1853 serial_driver
->name
= "ttyS";
1854 serial_driver
->major
= TTY_MAJOR
;
1855 serial_driver
->minor_start
= 64;
1856 serial_driver
->type
= TTY_DRIVER_TYPE_SERIAL
;
1857 serial_driver
->subtype
= SERIAL_TYPE_NORMAL
;
1858 serial_driver
->init_termios
= tty_std_termios
;
1859 serial_driver
->init_termios
.c_cflag
=
1860 B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
1861 serial_driver
->flags
= TTY_DRIVER_REAL_RAW
;
1862 tty_set_operations(serial_driver
, &serial_ops
);
1864 error
= tty_register_driver(serial_driver
);
1866 goto fail_put_tty_driver
;
1869 state
->port
= (int)&custom
.serdatr
; /* Just to give it a value */
1871 state
->custom_divisor
= 0;
1872 state
->icount
.cts
= state
->icount
.dsr
=
1873 state
->icount
.rng
= state
->icount
.dcd
= 0;
1874 state
->icount
.rx
= state
->icount
.tx
= 0;
1875 state
->icount
.frame
= state
->icount
.parity
= 0;
1876 state
->icount
.overrun
= state
->icount
.brk
= 0;
1877 tty_port_init(&state
->tport
);
1879 printk(KERN_INFO
"ttyS%d is the amiga builtin serial port\n",
1882 /* Hardware set up */
1884 state
->baud_base
= amiga_colorclock
;
1885 state
->xmit_fifo_size
= 1;
1887 /* set ISRs, and then disable the rx interrupts */
1888 error
= request_irq(IRQ_AMIGA_TBE
, ser_tx_int
, 0, "serial TX", state
);
1890 goto fail_unregister
;
1892 error
= request_irq(IRQ_AMIGA_RBF
, ser_rx_int
, 0,
1893 "serial RX", state
);
1897 local_irq_save(flags
);
1899 /* turn off Rx and Tx interrupts */
1900 custom
.intena
= IF_RBF
| IF_TBE
;
1903 /* clear any pending interrupt */
1904 custom
.intreq
= IF_RBF
| IF_TBE
;
1907 local_irq_restore(flags
);
1910 * set the appropriate directions for the modem control flags,
1911 * and clear RTS and DTR
1913 ciab
.ddra
|= (SER_DTR
| SER_RTS
); /* outputs */
1914 ciab
.ddra
&= ~(SER_DCD
| SER_CTS
| SER_DSR
); /* inputs */
1916 platform_set_drvdata(pdev
, state
);
1921 free_irq(IRQ_AMIGA_TBE
, state
);
1923 tty_unregister_driver(serial_driver
);
1924 fail_put_tty_driver
:
1925 put_tty_driver(serial_driver
);
1929 static int __exit
amiga_serial_remove(struct platform_device
*pdev
)
1932 struct serial_state
*state
= platform_get_drvdata(pdev
);
1934 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1935 if ((error
= tty_unregister_driver(serial_driver
)))
1936 printk("SERIAL: failed to unregister serial driver (%d)\n",
1938 put_tty_driver(serial_driver
);
1940 free_irq(IRQ_AMIGA_TBE
, state
);
1941 free_irq(IRQ_AMIGA_RBF
, state
);
1943 platform_set_drvdata(pdev
, NULL
);
1948 static struct platform_driver amiga_serial_driver
= {
1949 .remove
= __exit_p(amiga_serial_remove
),
1951 .name
= "amiga-serial",
1952 .owner
= THIS_MODULE
,
1956 static int __init
amiga_serial_init(void)
1958 return platform_driver_probe(&amiga_serial_driver
, amiga_serial_probe
);
1961 module_init(amiga_serial_init
);
1963 static void __exit
amiga_serial_exit(void)
1965 platform_driver_unregister(&amiga_serial_driver
);
1968 module_exit(amiga_serial_exit
);
1971 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1974 * ------------------------------------------------------------
1975 * Serial console driver
1976 * ------------------------------------------------------------
1979 static void amiga_serial_putc(char c
)
1981 custom
.serdat
= (unsigned char)c
| 0x100;
1982 while (!(custom
.serdatr
& 0x2000))
1987 * Print a string to the serial port trying not to disturb
1988 * any possible real use of the port...
1990 * The console must be locked when we get here.
1992 static void serial_console_write(struct console
*co
, const char *s
,
1995 unsigned short intena
= custom
.intenar
;
1997 custom
.intena
= IF_TBE
;
2001 amiga_serial_putc('\r');
2002 amiga_serial_putc(*s
++);
2005 custom
.intena
= IF_SETCLR
| (intena
& IF_TBE
);
2008 static struct tty_driver
*serial_console_device(struct console
*c
, int *index
)
2011 return serial_driver
;
2014 static struct console sercons
= {
2016 .write
= serial_console_write
,
2017 .device
= serial_console_device
,
2018 .flags
= CON_PRINTBUFFER
,
2025 static int __init
amiserial_console_init(void)
2027 register_console(&sercons
);
2030 console_initcall(amiserial_console_init
);
2032 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
2034 MODULE_LICENSE("GPL");
2035 MODULE_ALIAS("platform:amiga-serial");