1 // SPDX-License-Identifier: GPL-2.0
3 * Serial driver for the amiga builtin port.
5 * This code was created by taking serial.c version 4.30 from kernel
6 * release 2.3.22, replacing all hardware related stuff with the
7 * corresponding amiga hardware actions, and removing all irrelevant
8 * code. As a consequence, it uses many of the constants and names
9 * associated with the registers and bits of 16550 compatible UARTS -
10 * but only to keep track of status, etc in the state variables. It
11 * was done this was to make it easier to keep the code in line with
12 * (non hardware specific) changes to serial.c.
14 * The port is registered with the tty driver as minor device 64, and
15 * therefore other ports should should only use 65 upwards.
17 * Richard Lucock 28/12/99
19 * Copyright (C) 1991, 1992 Linus Torvalds
20 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
21 * 1998, 1999 Theodore Ts'o
25 #include <linux/delay.h>
27 /* Set of debugging defines */
29 #undef SERIAL_DEBUG_INTR
30 #undef SERIAL_DEBUG_OPEN
31 #undef SERIAL_DEBUG_FLOW
32 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
36 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
37 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
38 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
44 * End of serial driver configuration section.
47 #include <linux/module.h>
49 #include <linux/types.h>
50 #include <linux/serial.h>
51 #include <linux/serial_reg.h>
52 static char *serial_version
= "4.30";
54 #include <linux/errno.h>
55 #include <linux/signal.h>
56 #include <linux/sched.h>
57 #include <linux/kernel.h>
58 #include <linux/timer.h>
59 #include <linux/interrupt.h>
60 #include <linux/tty.h>
61 #include <linux/tty_flip.h>
62 #include <linux/circ_buf.h>
63 #include <linux/console.h>
64 #include <linux/major.h>
65 #include <linux/string.h>
66 #include <linux/fcntl.h>
67 #include <linux/ptrace.h>
68 #include <linux/ioport.h>
70 #include <linux/seq_file.h>
71 #include <linux/slab.h>
72 #include <linux/init.h>
73 #include <linux/bitops.h>
74 #include <linux/platform_device.h>
76 #include <asm/setup.h>
81 #include <asm/amigahw.h>
82 #include <asm/amigaints.h>
85 struct tty_port tport
;
87 struct async_icount icount
;
94 int ignore_status_mask
;
97 int IER
; /* Interrupt Enable Register */
98 int MCR
; /* Modem control register */
99 int x_char
; /* xon/xoff character */
102 #define custom amiga_custom
103 static char *serial_name
= "Amiga-builtin serial driver";
105 static struct tty_driver
*serial_driver
;
107 /* number of characters left in xmit buffer before we ask for more */
108 #define WAKEUP_CHARS 256
110 static unsigned char current_ctl_bits
;
112 static void change_speed(struct tty_struct
*tty
, struct serial_state
*info
,
113 struct ktermios
*old
);
114 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
);
117 static struct serial_state rs_table
[1];
119 #define NR_PORTS ARRAY_SIZE(rs_table)
121 #include <linux/uaccess.h>
123 #define serial_isroot() (capable(CAP_SYS_ADMIN))
125 /* some serial hardware definitions */
126 #define SDR_OVRUN (1<<15)
127 #define SDR_RBF (1<<14)
128 #define SDR_TBE (1<<13)
129 #define SDR_TSRE (1<<12)
131 #define SERPER_PARENB (1<<15)
133 #define AC_SETCLR (1<<15)
134 #define AC_UARTBRK (1<<11)
136 #define SER_DTR (1<<7)
137 #define SER_RTS (1<<6)
138 #define SER_DCD (1<<5)
139 #define SER_CTS (1<<4)
140 #define SER_DSR (1<<3)
142 static __inline__
void rtsdtr_ctrl(int bits
)
144 ciab
.pra
= ((bits
& (SER_RTS
| SER_DTR
)) ^ (SER_RTS
| SER_DTR
)) | (ciab
.pra
& ~(SER_RTS
| SER_DTR
));
148 * ------------------------------------------------------------
149 * rs_stop() and rs_start()
151 * This routines are called before setting or resetting tty->flow.stopped.
152 * They enable or disable transmitter interrupts, as necessary.
153 * ------------------------------------------------------------
155 static void rs_stop(struct tty_struct
*tty
)
157 struct serial_state
*info
= tty
->driver_data
;
160 local_irq_save(flags
);
161 if (info
->IER
& UART_IER_THRI
) {
162 info
->IER
&= ~UART_IER_THRI
;
163 /* disable Tx interrupt and remove any pending interrupts */
164 custom
.intena
= IF_TBE
;
166 custom
.intreq
= IF_TBE
;
169 local_irq_restore(flags
);
172 static void rs_start(struct tty_struct
*tty
)
174 struct serial_state
*info
= tty
->driver_data
;
177 local_irq_save(flags
);
178 if (info
->xmit
.head
!= info
->xmit
.tail
180 && !(info
->IER
& UART_IER_THRI
)) {
181 info
->IER
|= UART_IER_THRI
;
182 custom
.intena
= IF_SETCLR
| IF_TBE
;
184 /* set a pending Tx Interrupt, transmitter should restart now */
185 custom
.intreq
= IF_SETCLR
| IF_TBE
;
188 local_irq_restore(flags
);
192 * ----------------------------------------------------------------------
194 * Here starts the interrupt handling routines. All of the following
195 * subroutines are declared as inline and are folded into
196 * rs_interrupt(). They were separated out for readability's sake.
198 * Note: rs_interrupt() is a "fast" interrupt, which means that it
199 * runs with interrupts turned off. People who may want to modify
200 * rs_interrupt() should try to keep the interrupt handler as fast as
201 * possible. After you are done making modifications, it is not a bad
204 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
206 * and look at the resulting assemble code in serial.s.
208 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
209 * -----------------------------------------------------------------------
212 static void receive_chars(struct serial_state
*info
)
216 unsigned char ch
, flag
;
217 struct async_icount
*icount
;
220 icount
= &info
->icount
;
222 status
= UART_LSR_DR
; /* We obviously have a character! */
223 serdatr
= custom
.serdatr
;
225 custom
.intreq
= IF_RBF
;
228 if((serdatr
& 0x1ff) == 0)
229 status
|= UART_LSR_BI
;
230 if(serdatr
& SDR_OVRUN
)
231 status
|= UART_LSR_OE
;
236 #ifdef SERIAL_DEBUG_INTR
237 printk("DR%02x:%02x...", ch
, status
);
242 * We don't handle parity or frame errors - but I have left
243 * the code in, since I'm not sure that the errors can't be
247 if (status
& (UART_LSR_BI
| UART_LSR_PE
|
248 UART_LSR_FE
| UART_LSR_OE
)) {
250 * For statistics only
252 if (status
& UART_LSR_BI
) {
253 status
&= ~(UART_LSR_FE
| UART_LSR_PE
);
255 } else if (status
& UART_LSR_PE
)
257 else if (status
& UART_LSR_FE
)
259 if (status
& UART_LSR_OE
)
263 * Now check to see if character should be
264 * ignored, and mask off conditions which
267 if (status
& info
->ignore_status_mask
)
270 status
&= info
->read_status_mask
;
272 if (status
& (UART_LSR_BI
)) {
273 #ifdef SERIAL_DEBUG_INTR
274 printk("handling break....");
277 if (info
->tport
.flags
& ASYNC_SAK
)
278 do_SAK(info
->tport
.tty
);
279 } else if (status
& UART_LSR_PE
)
281 else if (status
& UART_LSR_FE
)
283 if (status
& UART_LSR_OE
) {
285 * Overrun is special, since it's
286 * reported immediately, and doesn't
287 * affect the current character
292 tty_insert_flip_char(&info
->tport
, ch
, flag
);
294 tty_insert_flip_char(&info
->tport
, 0, TTY_OVERRUN
);
295 tty_flip_buffer_push(&info
->tport
);
300 static void transmit_chars(struct serial_state
*info
)
302 custom
.intreq
= IF_TBE
;
305 custom
.serdat
= info
->x_char
| 0x100;
311 if (info
->xmit
.head
== info
->xmit
.tail
312 || info
->tport
.tty
->flow
.stopped
313 || info
->tport
.tty
->hw_stopped
) {
314 info
->IER
&= ~UART_IER_THRI
;
315 custom
.intena
= IF_TBE
;
320 custom
.serdat
= info
->xmit
.buf
[info
->xmit
.tail
++] | 0x100;
322 info
->xmit
.tail
= info
->xmit
.tail
& (SERIAL_XMIT_SIZE
-1);
325 if (CIRC_CNT(info
->xmit
.head
,
327 SERIAL_XMIT_SIZE
) < WAKEUP_CHARS
)
328 tty_wakeup(info
->tport
.tty
);
330 #ifdef SERIAL_DEBUG_INTR
333 if (info
->xmit
.head
== info
->xmit
.tail
) {
334 custom
.intena
= IF_TBE
;
336 info
->IER
&= ~UART_IER_THRI
;
340 static void check_modem_status(struct serial_state
*info
)
342 struct tty_port
*port
= &info
->tport
;
343 unsigned char status
= ciab
.pra
& (SER_DCD
| SER_CTS
| SER_DSR
);
344 unsigned char dstatus
;
345 struct async_icount
*icount
;
347 /* Determine bits that have changed */
348 dstatus
= status
^ current_ctl_bits
;
349 current_ctl_bits
= status
;
352 icount
= &info
->icount
;
353 /* update input line counters */
354 if (dstatus
& SER_DSR
)
356 if (dstatus
& SER_DCD
) {
359 if (dstatus
& SER_CTS
)
361 wake_up_interruptible(&port
->delta_msr_wait
);
364 if (tty_port_check_carrier(port
) && (dstatus
& SER_DCD
)) {
365 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
366 printk("ttyS%d CD now %s...", info
->line
,
367 (!(status
& SER_DCD
)) ? "on" : "off");
369 if (!(status
& SER_DCD
))
370 wake_up_interruptible(&port
->open_wait
);
372 #ifdef SERIAL_DEBUG_OPEN
373 printk("doing serial hangup...");
376 tty_hangup(port
->tty
);
379 if (tty_port_cts_enabled(port
)) {
380 if (port
->tty
->hw_stopped
) {
381 if (!(status
& SER_CTS
)) {
382 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
383 printk("CTS tx start...");
385 port
->tty
->hw_stopped
= 0;
386 info
->IER
|= UART_IER_THRI
;
387 custom
.intena
= IF_SETCLR
| IF_TBE
;
389 /* set a pending Tx Interrupt, transmitter should restart now */
390 custom
.intreq
= IF_SETCLR
| IF_TBE
;
392 tty_wakeup(port
->tty
);
396 if ((status
& SER_CTS
)) {
397 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
398 printk("CTS tx stop...");
400 port
->tty
->hw_stopped
= 1;
401 info
->IER
&= ~UART_IER_THRI
;
402 /* disable Tx interrupt and remove any pending interrupts */
403 custom
.intena
= IF_TBE
;
405 custom
.intreq
= IF_TBE
;
412 static irqreturn_t
ser_vbl_int( int irq
, void *data
)
414 /* vbl is just a periodic interrupt we tie into to update modem status */
415 struct serial_state
*info
= data
;
417 * TBD - is it better to unregister from this interrupt or to
418 * ignore it if MSI is clear ?
420 if(info
->IER
& UART_IER_MSI
)
421 check_modem_status(info
);
425 static irqreturn_t
ser_rx_int(int irq
, void *dev_id
)
427 struct serial_state
*info
= dev_id
;
429 #ifdef SERIAL_DEBUG_INTR
430 printk("ser_rx_int...");
433 if (!info
->tport
.tty
)
437 #ifdef SERIAL_DEBUG_INTR
443 static irqreturn_t
ser_tx_int(int irq
, void *dev_id
)
445 struct serial_state
*info
= dev_id
;
447 if (custom
.serdatr
& SDR_TBE
) {
448 #ifdef SERIAL_DEBUG_INTR
449 printk("ser_tx_int...");
452 if (!info
->tport
.tty
)
455 transmit_chars(info
);
456 #ifdef SERIAL_DEBUG_INTR
464 * -------------------------------------------------------------------
465 * Here ends the serial interrupt routines.
466 * -------------------------------------------------------------------
470 * ---------------------------------------------------------------
471 * Low level utility subroutines for the serial driver: routines to
472 * figure out the appropriate timeout for an interrupt chain, routines
473 * to initialize and startup a serial port, and routines to shutdown a
474 * serial port. Useful stuff like that.
475 * ---------------------------------------------------------------
478 static int startup(struct tty_struct
*tty
, struct serial_state
*info
)
480 struct tty_port
*port
= &info
->tport
;
485 page
= get_zeroed_page(GFP_KERNEL
);
489 local_irq_save(flags
);
491 if (tty_port_initialized(port
)) {
499 info
->xmit
.buf
= (unsigned char *) page
;
501 #ifdef SERIAL_DEBUG_OPEN
502 printk("starting up ttys%d ...", info
->line
);
505 /* Clear anything in the input buffer */
507 custom
.intreq
= IF_RBF
;
510 retval
= request_irq(IRQ_AMIGA_VERTB
, ser_vbl_int
, 0, "serial status", info
);
512 if (serial_isroot()) {
513 set_bit(TTY_IO_ERROR
, &tty
->flags
);
519 /* enable both Rx and Tx interrupts */
520 custom
.intena
= IF_SETCLR
| IF_RBF
| IF_TBE
;
522 info
->IER
= UART_IER_MSI
;
524 /* remember current state of the DCD and CTS bits */
525 current_ctl_bits
= ciab
.pra
& (SER_DCD
| SER_CTS
| SER_DSR
);
529 info
->MCR
= SER_DTR
| SER_RTS
;
530 rtsdtr_ctrl(info
->MCR
);
532 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
533 info
->xmit
.head
= info
->xmit
.tail
= 0;
536 * and set the speed of the serial port
538 change_speed(tty
, info
, NULL
);
540 tty_port_set_initialized(port
, 1);
541 local_irq_restore(flags
);
545 local_irq_restore(flags
);
550 * This routine will shutdown a serial port; interrupts are disabled, and
551 * DTR is dropped if the hangup on close termio flag is on.
553 static void shutdown(struct tty_struct
*tty
, struct serial_state
*info
)
556 struct serial_state
*state
;
558 if (!tty_port_initialized(&info
->tport
))
563 #ifdef SERIAL_DEBUG_OPEN
564 printk("Shutting down serial port %d ....\n", info
->line
);
567 local_irq_save(flags
); /* Disable interrupts */
570 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
571 * here so the queue might never be waken up
573 wake_up_interruptible(&info
->tport
.delta_msr_wait
);
576 * Free the IRQ, if necessary
578 free_irq(IRQ_AMIGA_VERTB
, info
);
580 if (info
->xmit
.buf
) {
581 free_page((unsigned long) info
->xmit
.buf
);
582 info
->xmit
.buf
= NULL
;
586 custom
.intena
= IF_RBF
| IF_TBE
;
589 /* disable break condition */
590 custom
.adkcon
= AC_UARTBRK
;
594 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
595 rtsdtr_ctrl(info
->MCR
);
597 set_bit(TTY_IO_ERROR
, &tty
->flags
);
599 tty_port_set_initialized(&info
->tport
, 0);
600 local_irq_restore(flags
);
605 * This routine is called to set the UART divisor registers to match
606 * the specified baud rate for a serial port.
608 static void change_speed(struct tty_struct
*tty
, struct serial_state
*info
,
609 struct ktermios
*old_termios
)
611 struct tty_port
*port
= &info
->tport
;
612 int quot
= 0, baud_base
, baud
;
613 unsigned cflag
, cval
= 0;
617 cflag
= tty
->termios
.c_cflag
;
619 /* Byte size is always 8 bits plus parity bit if requested */
622 if (cflag
& CSTOPB
) {
626 if (cflag
& PARENB
) {
627 cval
|= UART_LCR_PARITY
;
630 if (!(cflag
& PARODD
))
631 cval
|= UART_LCR_EPAR
;
634 cval
|= UART_LCR_SPAR
;
637 /* Determine divisor based on baud rate */
638 baud
= tty_get_baud_rate(tty
);
640 baud
= 9600; /* B0 transition handled in rs_set_termios */
641 baud_base
= info
->baud_base
;
642 if (baud
== 38400 && (port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
)
643 quot
= info
->custom_divisor
;
646 /* Special case since 134 is really 134.5 */
647 quot
= (2*baud_base
/ 269);
649 quot
= baud_base
/ baud
;
651 /* If the quotient is zero refuse the change */
652 if (!quot
&& old_termios
) {
653 /* FIXME: Will need updating for new tty in the end */
654 tty
->termios
.c_cflag
&= ~CBAUD
;
655 tty
->termios
.c_cflag
|= (old_termios
->c_cflag
& CBAUD
);
656 baud
= tty_get_baud_rate(tty
);
660 (port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
)
661 quot
= info
->custom_divisor
;
664 /* Special case since 134 is really 134.5 */
665 quot
= (2*baud_base
/ 269);
667 quot
= baud_base
/ baud
;
670 /* As a last resort, if the quotient is zero, default to 9600 bps */
672 quot
= baud_base
/ 9600;
674 info
->timeout
= ((info
->xmit_fifo_size
*HZ
*bits
*quot
) / baud_base
);
675 info
->timeout
+= HZ
/50; /* Add .02 seconds of slop */
677 /* CTS flow control flag and modem status interrupts */
678 info
->IER
&= ~UART_IER_MSI
;
679 if (port
->flags
& ASYNC_HARDPPS_CD
)
680 info
->IER
|= UART_IER_MSI
;
681 tty_port_set_cts_flow(port
, cflag
& CRTSCTS
);
683 info
->IER
|= UART_IER_MSI
;
684 tty_port_set_check_carrier(port
, ~cflag
& CLOCAL
);
686 info
->IER
|= UART_IER_MSI
;
688 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
692 * Set up parity check flag
695 info
->read_status_mask
= UART_LSR_OE
| UART_LSR_DR
;
697 info
->read_status_mask
|= UART_LSR_FE
| UART_LSR_PE
;
698 if (I_BRKINT(tty
) || I_PARMRK(tty
))
699 info
->read_status_mask
|= UART_LSR_BI
;
702 * Characters to ignore
704 info
->ignore_status_mask
= 0;
706 info
->ignore_status_mask
|= UART_LSR_PE
| UART_LSR_FE
;
708 info
->ignore_status_mask
|= UART_LSR_BI
;
710 * If we're ignore parity and break indicators, ignore
711 * overruns too. (For real raw support).
714 info
->ignore_status_mask
|= UART_LSR_OE
;
717 * !!! ignore all characters if CREAD is not set
719 if ((cflag
& CREAD
) == 0)
720 info
->ignore_status_mask
|= UART_LSR_DR
;
721 local_irq_save(flags
);
726 /* Set up the baud rate */
729 /* Enable or disable parity bit */
731 if(cval
& UART_LCR_PARITY
)
732 serper
|= (SERPER_PARENB
);
734 custom
.serper
= serper
;
738 local_irq_restore(flags
);
741 static int rs_put_char(struct tty_struct
*tty
, unsigned char ch
)
743 struct serial_state
*info
;
746 info
= tty
->driver_data
;
751 local_irq_save(flags
);
752 if (CIRC_SPACE(info
->xmit
.head
,
754 SERIAL_XMIT_SIZE
) == 0) {
755 local_irq_restore(flags
);
759 info
->xmit
.buf
[info
->xmit
.head
++] = ch
;
760 info
->xmit
.head
&= SERIAL_XMIT_SIZE
-1;
761 local_irq_restore(flags
);
765 static void rs_flush_chars(struct tty_struct
*tty
)
767 struct serial_state
*info
= tty
->driver_data
;
770 if (info
->xmit
.head
== info
->xmit
.tail
776 local_irq_save(flags
);
777 info
->IER
|= UART_IER_THRI
;
778 custom
.intena
= IF_SETCLR
| IF_TBE
;
780 /* set a pending Tx Interrupt, transmitter should restart now */
781 custom
.intreq
= IF_SETCLR
| IF_TBE
;
783 local_irq_restore(flags
);
786 static int rs_write(struct tty_struct
* tty
, const unsigned char *buf
, int count
)
789 struct serial_state
*info
= tty
->driver_data
;
795 local_irq_save(flags
);
797 c
= CIRC_SPACE_TO_END(info
->xmit
.head
,
805 memcpy(info
->xmit
.buf
+ info
->xmit
.head
, buf
, c
);
806 info
->xmit
.head
= ((info
->xmit
.head
+ c
) &
807 (SERIAL_XMIT_SIZE
-1));
812 local_irq_restore(flags
);
814 if (info
->xmit
.head
!= info
->xmit
.tail
815 && !tty
->flow
.stopped
817 && !(info
->IER
& UART_IER_THRI
)) {
818 info
->IER
|= UART_IER_THRI
;
820 custom
.intena
= IF_SETCLR
| IF_TBE
;
822 /* set a pending Tx Interrupt, transmitter should restart now */
823 custom
.intreq
= IF_SETCLR
| IF_TBE
;
825 local_irq_restore(flags
);
830 static unsigned int rs_write_room(struct tty_struct
*tty
)
832 struct serial_state
*info
= tty
->driver_data
;
834 return CIRC_SPACE(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
837 static int rs_chars_in_buffer(struct tty_struct
*tty
)
839 struct serial_state
*info
= tty
->driver_data
;
841 return CIRC_CNT(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
844 static void rs_flush_buffer(struct tty_struct
*tty
)
846 struct serial_state
*info
= tty
->driver_data
;
849 local_irq_save(flags
);
850 info
->xmit
.head
= info
->xmit
.tail
= 0;
851 local_irq_restore(flags
);
856 * This function is used to send a high-priority XON/XOFF character to
859 static void rs_send_xchar(struct tty_struct
*tty
, char ch
)
861 struct serial_state
*info
= tty
->driver_data
;
866 /* Make sure transmit interrupts are on */
869 local_irq_save(flags
);
870 if(!(custom
.intenar
& IF_TBE
)) {
871 custom
.intena
= IF_SETCLR
| IF_TBE
;
873 /* set a pending Tx Interrupt, transmitter should restart now */
874 custom
.intreq
= IF_SETCLR
| IF_TBE
;
877 local_irq_restore(flags
);
879 info
->IER
|= UART_IER_THRI
;
884 * ------------------------------------------------------------
887 * This routine is called by the upper-layer tty layer to signal that
888 * incoming characters should be throttled.
889 * ------------------------------------------------------------
891 static void rs_throttle(struct tty_struct
* tty
)
893 struct serial_state
*info
= tty
->driver_data
;
895 #ifdef SERIAL_DEBUG_THROTTLE
896 printk("throttle %s ....\n", tty_name(tty
));
900 rs_send_xchar(tty
, STOP_CHAR(tty
));
903 info
->MCR
&= ~SER_RTS
;
905 local_irq_save(flags
);
906 rtsdtr_ctrl(info
->MCR
);
907 local_irq_restore(flags
);
910 static void rs_unthrottle(struct tty_struct
* tty
)
912 struct serial_state
*info
= tty
->driver_data
;
914 #ifdef SERIAL_DEBUG_THROTTLE
915 printk("unthrottle %s ....\n", tty_name(tty
));
922 rs_send_xchar(tty
, START_CHAR(tty
));
925 info
->MCR
|= SER_RTS
;
926 local_irq_save(flags
);
927 rtsdtr_ctrl(info
->MCR
);
928 local_irq_restore(flags
);
932 * ------------------------------------------------------------
933 * rs_ioctl() and friends
934 * ------------------------------------------------------------
937 static int get_serial_info(struct tty_struct
*tty
, struct serial_struct
*ss
)
939 struct serial_state
*state
= tty
->driver_data
;
940 unsigned int close_delay
, closing_wait
;
943 close_delay
= jiffies_to_msecs(state
->tport
.close_delay
) / 10;
944 closing_wait
= state
->tport
.closing_wait
;
945 if (closing_wait
!= ASYNC_CLOSING_WAIT_NONE
)
946 closing_wait
= jiffies_to_msecs(closing_wait
) / 10;
948 ss
->line
= tty
->index
;
949 ss
->port
= state
->port
;
950 ss
->flags
= state
->tport
.flags
;
951 ss
->xmit_fifo_size
= state
->xmit_fifo_size
;
952 ss
->baud_base
= state
->baud_base
;
953 ss
->close_delay
= close_delay
;
954 ss
->closing_wait
= closing_wait
;
955 ss
->custom_divisor
= state
->custom_divisor
;
960 static int set_serial_info(struct tty_struct
*tty
, struct serial_struct
*ss
)
962 struct serial_state
*state
= tty
->driver_data
;
963 struct tty_port
*port
= &state
->tport
;
966 unsigned int close_delay
, closing_wait
;
969 change_spd
= ((ss
->flags
^ port
->flags
) & ASYNC_SPD_MASK
) ||
970 ss
->custom_divisor
!= state
->custom_divisor
;
971 if (ss
->irq
|| ss
->port
!= state
->port
||
972 ss
->xmit_fifo_size
!= state
->xmit_fifo_size
) {
977 close_delay
= msecs_to_jiffies(ss
->close_delay
* 10);
978 closing_wait
= ss
->closing_wait
;
979 if (closing_wait
!= ASYNC_CLOSING_WAIT_NONE
)
980 closing_wait
= msecs_to_jiffies(closing_wait
* 10);
982 if (!serial_isroot()) {
983 if ((ss
->baud_base
!= state
->baud_base
) ||
984 (close_delay
!= port
->close_delay
) ||
985 (closing_wait
!= port
->closing_wait
) ||
986 (ss
->xmit_fifo_size
!= state
->xmit_fifo_size
) ||
987 ((ss
->flags
& ~ASYNC_USR_MASK
) !=
988 (port
->flags
& ~ASYNC_USR_MASK
))) {
992 port
->flags
= ((port
->flags
& ~ASYNC_USR_MASK
) |
993 (ss
->flags
& ASYNC_USR_MASK
));
994 state
->custom_divisor
= ss
->custom_divisor
;
998 if (ss
->baud_base
< 9600) {
1004 * OK, past this point, all the error checking has been done.
1005 * At this point, we start making changes.....
1008 state
->baud_base
= ss
->baud_base
;
1009 port
->flags
= ((port
->flags
& ~ASYNC_FLAGS
) |
1010 (ss
->flags
& ASYNC_FLAGS
));
1011 state
->custom_divisor
= ss
->custom_divisor
;
1012 port
->close_delay
= close_delay
;
1013 port
->closing_wait
= closing_wait
;
1016 if (tty_port_initialized(port
)) {
1018 /* warn about deprecation unless clearing */
1019 if (ss
->flags
& ASYNC_SPD_MASK
)
1020 dev_warn_ratelimited(tty
->dev
, "use of SPD flags is deprecated\n");
1021 change_speed(tty
, state
, NULL
);
1024 retval
= startup(tty
, state
);
1030 * get_lsr_info - get line status register info
1032 * Purpose: Let user call ioctl() to get info when the UART physically
1033 * is emptied. On bus types like RS485, the transmitter must
1034 * release the bus after transmitting. This must be done when
1035 * the transmit shift register is empty, not be done when the
1036 * transmit holding register is empty. This functionality
1037 * allows an RS485 driver to be written in user space.
1039 static int get_lsr_info(struct serial_state
*info
, unsigned int __user
*value
)
1041 unsigned char status
;
1042 unsigned int result
;
1043 unsigned long flags
;
1045 local_irq_save(flags
);
1046 status
= custom
.serdatr
;
1048 local_irq_restore(flags
);
1049 result
= ((status
& SDR_TSRE
) ? TIOCSER_TEMT
: 0);
1050 if (copy_to_user(value
, &result
, sizeof(int)))
1056 static int rs_tiocmget(struct tty_struct
*tty
)
1058 struct serial_state
*info
= tty
->driver_data
;
1059 unsigned char control
, status
;
1060 unsigned long flags
;
1062 if (tty_io_error(tty
))
1065 control
= info
->MCR
;
1066 local_irq_save(flags
);
1068 local_irq_restore(flags
);
1069 return ((control
& SER_RTS
) ? TIOCM_RTS
: 0)
1070 | ((control
& SER_DTR
) ? TIOCM_DTR
: 0)
1071 | (!(status
& SER_DCD
) ? TIOCM_CAR
: 0)
1072 | (!(status
& SER_DSR
) ? TIOCM_DSR
: 0)
1073 | (!(status
& SER_CTS
) ? TIOCM_CTS
: 0);
1076 static int rs_tiocmset(struct tty_struct
*tty
, unsigned int set
,
1079 struct serial_state
*info
= tty
->driver_data
;
1080 unsigned long flags
;
1082 if (tty_io_error(tty
))
1085 local_irq_save(flags
);
1086 if (set
& TIOCM_RTS
)
1087 info
->MCR
|= SER_RTS
;
1088 if (set
& TIOCM_DTR
)
1089 info
->MCR
|= SER_DTR
;
1090 if (clear
& TIOCM_RTS
)
1091 info
->MCR
&= ~SER_RTS
;
1092 if (clear
& TIOCM_DTR
)
1093 info
->MCR
&= ~SER_DTR
;
1094 rtsdtr_ctrl(info
->MCR
);
1095 local_irq_restore(flags
);
1100 * rs_break() --- routine which turns the break handling on or off
1102 static int rs_break(struct tty_struct
*tty
, int break_state
)
1104 unsigned long flags
;
1106 local_irq_save(flags
);
1107 if (break_state
== -1)
1108 custom
.adkcon
= AC_SETCLR
| AC_UARTBRK
;
1110 custom
.adkcon
= AC_UARTBRK
;
1112 local_irq_restore(flags
);
1117 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1118 * Return: write counters to the user passed counter struct
1119 * NB: both 1->0 and 0->1 transitions are counted except for
1120 * RI where only 0->1 is counted.
1122 static int rs_get_icount(struct tty_struct
*tty
,
1123 struct serial_icounter_struct
*icount
)
1125 struct serial_state
*info
= tty
->driver_data
;
1126 struct async_icount cnow
;
1127 unsigned long flags
;
1129 local_irq_save(flags
);
1130 cnow
= info
->icount
;
1131 local_irq_restore(flags
);
1132 icount
->cts
= cnow
.cts
;
1133 icount
->dsr
= cnow
.dsr
;
1134 icount
->rng
= cnow
.rng
;
1135 icount
->dcd
= cnow
.dcd
;
1136 icount
->rx
= cnow
.rx
;
1137 icount
->tx
= cnow
.tx
;
1138 icount
->frame
= cnow
.frame
;
1139 icount
->overrun
= cnow
.overrun
;
1140 icount
->parity
= cnow
.parity
;
1141 icount
->brk
= cnow
.brk
;
1142 icount
->buf_overrun
= cnow
.buf_overrun
;
1147 static int rs_ioctl(struct tty_struct
*tty
,
1148 unsigned int cmd
, unsigned long arg
)
1150 struct serial_state
*info
= tty
->driver_data
;
1151 struct async_icount cprev
, cnow
; /* kernel counter temps */
1152 void __user
*argp
= (void __user
*)arg
;
1153 unsigned long flags
;
1157 if ((cmd
!= TIOCSERCONFIG
) &&
1158 (cmd
!= TIOCMIWAIT
) && (cmd
!= TIOCGICOUNT
)) {
1159 if (tty_io_error(tty
))
1167 case TIOCSERGETLSR
: /* Get line status register */
1168 return get_lsr_info(info
, argp
);
1171 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1172 * - mask passed in arg for lines of interest
1173 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1174 * Caller should use TIOCGICOUNT to see which one it was
1177 local_irq_save(flags
);
1178 /* note the counters on entry */
1179 cprev
= info
->icount
;
1180 local_irq_restore(flags
);
1182 prepare_to_wait(&info
->tport
.delta_msr_wait
,
1183 &wait
, TASK_INTERRUPTIBLE
);
1184 local_irq_save(flags
);
1185 cnow
= info
->icount
; /* atomic copy */
1186 local_irq_restore(flags
);
1187 if (cnow
.rng
== cprev
.rng
&& cnow
.dsr
== cprev
.dsr
&&
1188 cnow
.dcd
== cprev
.dcd
&& cnow
.cts
== cprev
.cts
) {
1189 ret
= -EIO
; /* no change => error */
1192 if ( ((arg
& TIOCM_RNG
) && (cnow
.rng
!= cprev
.rng
)) ||
1193 ((arg
& TIOCM_DSR
) && (cnow
.dsr
!= cprev
.dsr
)) ||
1194 ((arg
& TIOCM_CD
) && (cnow
.dcd
!= cprev
.dcd
)) ||
1195 ((arg
& TIOCM_CTS
) && (cnow
.cts
!= cprev
.cts
)) ) {
1200 /* see if a signal did it */
1201 if (signal_pending(current
)) {
1207 finish_wait(&info
->tport
.delta_msr_wait
, &wait
);
1211 return -ENOIOCTLCMD
;
1216 static void rs_set_termios(struct tty_struct
*tty
, struct ktermios
*old_termios
)
1218 struct serial_state
*info
= tty
->driver_data
;
1219 unsigned long flags
;
1220 unsigned int cflag
= tty
->termios
.c_cflag
;
1222 change_speed(tty
, info
, old_termios
);
1224 /* Handle transition to B0 status */
1225 if ((old_termios
->c_cflag
& CBAUD
) && !(cflag
& CBAUD
)) {
1226 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
1227 local_irq_save(flags
);
1228 rtsdtr_ctrl(info
->MCR
);
1229 local_irq_restore(flags
);
1232 /* Handle transition away from B0 status */
1233 if (!(old_termios
->c_cflag
& CBAUD
) && (cflag
& CBAUD
)) {
1234 info
->MCR
|= SER_DTR
;
1235 if (!C_CRTSCTS(tty
) || !tty_throttled(tty
))
1236 info
->MCR
|= SER_RTS
;
1237 local_irq_save(flags
);
1238 rtsdtr_ctrl(info
->MCR
);
1239 local_irq_restore(flags
);
1242 /* Handle turning off CRTSCTS */
1243 if ((old_termios
->c_cflag
& CRTSCTS
) && !C_CRTSCTS(tty
)) {
1244 tty
->hw_stopped
= 0;
1250 * No need to wake up processes in open wait, since they
1251 * sample the CLOCAL flag once, and don't recheck it.
1252 * XXX It's not clear whether the current behavior is correct
1253 * or not. Hence, this may change.....
1255 if (!(old_termios
->c_cflag
& CLOCAL
) && C_CLOCAL(tty
))
1256 wake_up_interruptible(&info
->open_wait
);
1261 * ------------------------------------------------------------
1264 * This routine is called when the serial port gets closed. First, we
1265 * wait for the last remaining data to be sent. Then, we unlink its
1266 * async structure from the interrupt chain if necessary, and we free
1267 * that IRQ if nothing is left in the chain.
1268 * ------------------------------------------------------------
1270 static void rs_close(struct tty_struct
*tty
, struct file
* filp
)
1272 struct serial_state
*state
= tty
->driver_data
;
1273 struct tty_port
*port
= &state
->tport
;
1275 if (tty_port_close_start(port
, tty
, filp
) == 0)
1279 * At this point we stop accepting input. To do this, we
1280 * disable the receive line status interrupts, and tell the
1281 * interrupt driver to stop checking the data ready bit in the
1282 * line status register.
1284 state
->read_status_mask
&= ~UART_LSR_DR
;
1285 if (tty_port_initialized(port
)) {
1286 /* disable receive interrupts */
1287 custom
.intena
= IF_RBF
;
1289 /* clear any pending receive interrupt */
1290 custom
.intreq
= IF_RBF
;
1294 * Before we drop DTR, make sure the UART transmitter
1295 * has completely drained; this is especially
1296 * important if there is a transmit FIFO!
1298 rs_wait_until_sent(tty
, state
->timeout
);
1300 shutdown(tty
, state
);
1301 rs_flush_buffer(tty
);
1303 tty_ldisc_flush(tty
);
1306 tty_port_close_end(port
, tty
);
1310 * rs_wait_until_sent() --- wait until the transmitter is empty
1312 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
)
1314 struct serial_state
*info
= tty
->driver_data
;
1315 unsigned long orig_jiffies
, char_time
;
1318 if (info
->xmit_fifo_size
== 0)
1319 return; /* Just in case.... */
1321 orig_jiffies
= jiffies
;
1324 * Set the check interval to be 1/5 of the estimated time to
1325 * send a single character, and make it at least 1. The check
1326 * interval should also be less than the timeout.
1328 * Note: we have to use pretty tight timings here to satisfy
1331 char_time
= (info
->timeout
- HZ
/50) / info
->xmit_fifo_size
;
1332 char_time
= char_time
/ 5;
1336 char_time
= min_t(unsigned long, char_time
, timeout
);
1338 * If the transmitter hasn't cleared in twice the approximate
1339 * amount of time to send the entire FIFO, it probably won't
1340 * ever clear. This assumes the UART isn't doing flow
1341 * control, which is currently the case. Hence, if it ever
1342 * takes longer than info->timeout, this is probably due to a
1343 * UART bug of some kind. So, we clamp the timeout parameter at
1346 if (!timeout
|| timeout
> 2*info
->timeout
)
1347 timeout
= 2*info
->timeout
;
1348 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1349 printk("In rs_wait_until_sent(%d) check=%lu...", timeout
, char_time
);
1350 printk("jiff=%lu...", jiffies
);
1352 while(!((lsr
= custom
.serdatr
) & SDR_TSRE
)) {
1353 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1354 printk("serdatr = %d (jiff=%lu)...", lsr
, jiffies
);
1356 msleep_interruptible(jiffies_to_msecs(char_time
));
1357 if (signal_pending(current
))
1359 if (timeout
&& time_after(jiffies
, orig_jiffies
+ timeout
))
1362 __set_current_state(TASK_RUNNING
);
1364 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1365 printk("lsr = %d (jiff=%lu)...done\n", lsr
, jiffies
);
1370 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1372 static void rs_hangup(struct tty_struct
*tty
)
1374 struct serial_state
*info
= tty
->driver_data
;
1376 rs_flush_buffer(tty
);
1377 shutdown(tty
, info
);
1378 info
->tport
.count
= 0;
1379 tty_port_set_active(&info
->tport
, 0);
1380 info
->tport
.tty
= NULL
;
1381 wake_up_interruptible(&info
->tport
.open_wait
);
1385 * This routine is called whenever a serial port is opened. It
1386 * enables interrupts for a serial port, linking in its async structure into
1387 * the IRQ chain. It also performs the serial-specific
1388 * initialization for the tty structure.
1390 static int rs_open(struct tty_struct
*tty
, struct file
* filp
)
1392 struct serial_state
*info
= rs_table
+ tty
->index
;
1393 struct tty_port
*port
= &info
->tport
;
1398 tty
->driver_data
= info
;
1401 retval
= startup(tty
, info
);
1406 return tty_port_block_til_ready(port
, tty
, filp
);
1410 * /proc fs routines....
1413 static inline void line_info(struct seq_file
*m
, int line
,
1414 struct serial_state
*state
)
1416 char stat_buf
[30], control
, status
;
1417 unsigned long flags
;
1419 seq_printf(m
, "%d: uart:amiga_builtin", line
);
1421 local_irq_save(flags
);
1423 control
= tty_port_initialized(&state
->tport
) ? state
->MCR
: status
;
1424 local_irq_restore(flags
);
1428 if(!(control
& SER_RTS
))
1429 strcat(stat_buf
, "|RTS");
1430 if(!(status
& SER_CTS
))
1431 strcat(stat_buf
, "|CTS");
1432 if(!(control
& SER_DTR
))
1433 strcat(stat_buf
, "|DTR");
1434 if(!(status
& SER_DSR
))
1435 strcat(stat_buf
, "|DSR");
1436 if(!(status
& SER_DCD
))
1437 strcat(stat_buf
, "|CD");
1440 seq_printf(m
, " baud:%d", state
->baud_base
/ state
->quot
);
1442 seq_printf(m
, " tx:%d rx:%d", state
->icount
.tx
, state
->icount
.rx
);
1444 if (state
->icount
.frame
)
1445 seq_printf(m
, " fe:%d", state
->icount
.frame
);
1447 if (state
->icount
.parity
)
1448 seq_printf(m
, " pe:%d", state
->icount
.parity
);
1450 if (state
->icount
.brk
)
1451 seq_printf(m
, " brk:%d", state
->icount
.brk
);
1453 if (state
->icount
.overrun
)
1454 seq_printf(m
, " oe:%d", state
->icount
.overrun
);
1457 * Last thing is the RS-232 status lines
1459 seq_printf(m
, " %s\n", stat_buf
+1);
1462 static int rs_proc_show(struct seq_file
*m
, void *v
)
1464 seq_printf(m
, "serinfo:1.0 driver:%s\n", serial_version
);
1465 line_info(m
, 0, &rs_table
[0]);
1470 * ---------------------------------------------------------------------
1471 * rs_init() and friends
1473 * rs_init() is called at boot-time to initialize the serial driver.
1474 * ---------------------------------------------------------------------
1478 * This routine prints out the appropriate serial driver version
1479 * number, and identifies which options were configured into this
1482 static void show_serial_version(void)
1484 printk(KERN_INFO
"%s version %s\n", serial_name
, serial_version
);
1488 static const struct tty_operations serial_ops
= {
1492 .put_char
= rs_put_char
,
1493 .flush_chars
= rs_flush_chars
,
1494 .write_room
= rs_write_room
,
1495 .chars_in_buffer
= rs_chars_in_buffer
,
1496 .flush_buffer
= rs_flush_buffer
,
1498 .throttle
= rs_throttle
,
1499 .unthrottle
= rs_unthrottle
,
1500 .set_termios
= rs_set_termios
,
1503 .hangup
= rs_hangup
,
1504 .break_ctl
= rs_break
,
1505 .send_xchar
= rs_send_xchar
,
1506 .wait_until_sent
= rs_wait_until_sent
,
1507 .tiocmget
= rs_tiocmget
,
1508 .tiocmset
= rs_tiocmset
,
1509 .get_icount
= rs_get_icount
,
1510 .set_serial
= set_serial_info
,
1511 .get_serial
= get_serial_info
,
1512 .proc_show
= rs_proc_show
,
1515 static int amiga_carrier_raised(struct tty_port
*port
)
1517 return !(ciab
.pra
& SER_DCD
);
1520 static void amiga_dtr_rts(struct tty_port
*port
, int raise
)
1522 struct serial_state
*info
= container_of(port
, struct serial_state
,
1524 unsigned long flags
;
1527 info
->MCR
|= SER_DTR
|SER_RTS
;
1529 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
1531 local_irq_save(flags
);
1532 rtsdtr_ctrl(info
->MCR
);
1533 local_irq_restore(flags
);
1536 static const struct tty_port_operations amiga_port_ops
= {
1537 .carrier_raised
= amiga_carrier_raised
,
1538 .dtr_rts
= amiga_dtr_rts
,
1542 * The serial driver boot-time initialization code!
1544 static int __init
amiga_serial_probe(struct platform_device
*pdev
)
1546 unsigned long flags
;
1547 struct serial_state
* state
;
1550 serial_driver
= alloc_tty_driver(NR_PORTS
);
1554 show_serial_version();
1556 /* Initialize the tty_driver structure */
1558 serial_driver
->driver_name
= "amiserial";
1559 serial_driver
->name
= "ttyS";
1560 serial_driver
->major
= TTY_MAJOR
;
1561 serial_driver
->minor_start
= 64;
1562 serial_driver
->type
= TTY_DRIVER_TYPE_SERIAL
;
1563 serial_driver
->subtype
= SERIAL_TYPE_NORMAL
;
1564 serial_driver
->init_termios
= tty_std_termios
;
1565 serial_driver
->init_termios
.c_cflag
=
1566 B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
1567 serial_driver
->flags
= TTY_DRIVER_REAL_RAW
;
1568 tty_set_operations(serial_driver
, &serial_ops
);
1571 state
->port
= (int)&custom
.serdatr
; /* Just to give it a value */
1572 state
->custom_divisor
= 0;
1573 state
->icount
.cts
= state
->icount
.dsr
=
1574 state
->icount
.rng
= state
->icount
.dcd
= 0;
1575 state
->icount
.rx
= state
->icount
.tx
= 0;
1576 state
->icount
.frame
= state
->icount
.parity
= 0;
1577 state
->icount
.overrun
= state
->icount
.brk
= 0;
1578 tty_port_init(&state
->tport
);
1579 state
->tport
.ops
= &amiga_port_ops
;
1580 tty_port_link_device(&state
->tport
, serial_driver
, 0);
1582 error
= tty_register_driver(serial_driver
);
1584 goto fail_put_tty_driver
;
1586 printk(KERN_INFO
"ttyS0 is the amiga builtin serial port\n");
1588 /* Hardware set up */
1590 state
->baud_base
= amiga_colorclock
;
1591 state
->xmit_fifo_size
= 1;
1593 /* set ISRs, and then disable the rx interrupts */
1594 error
= request_irq(IRQ_AMIGA_TBE
, ser_tx_int
, 0, "serial TX", state
);
1596 goto fail_unregister
;
1598 error
= request_irq(IRQ_AMIGA_RBF
, ser_rx_int
, 0,
1599 "serial RX", state
);
1603 local_irq_save(flags
);
1605 /* turn off Rx and Tx interrupts */
1606 custom
.intena
= IF_RBF
| IF_TBE
;
1609 /* clear any pending interrupt */
1610 custom
.intreq
= IF_RBF
| IF_TBE
;
1613 local_irq_restore(flags
);
1616 * set the appropriate directions for the modem control flags,
1617 * and clear RTS and DTR
1619 ciab
.ddra
|= (SER_DTR
| SER_RTS
); /* outputs */
1620 ciab
.ddra
&= ~(SER_DCD
| SER_CTS
| SER_DSR
); /* inputs */
1622 platform_set_drvdata(pdev
, state
);
1627 free_irq(IRQ_AMIGA_TBE
, state
);
1629 tty_unregister_driver(serial_driver
);
1630 fail_put_tty_driver
:
1631 tty_port_destroy(&state
->tport
);
1632 put_tty_driver(serial_driver
);
1636 static int __exit
amiga_serial_remove(struct platform_device
*pdev
)
1638 struct serial_state
*state
= platform_get_drvdata(pdev
);
1640 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1641 tty_unregister_driver(serial_driver
);
1642 put_tty_driver(serial_driver
);
1643 tty_port_destroy(&state
->tport
);
1645 free_irq(IRQ_AMIGA_TBE
, state
);
1646 free_irq(IRQ_AMIGA_RBF
, state
);
1651 static struct platform_driver amiga_serial_driver
= {
1652 .remove
= __exit_p(amiga_serial_remove
),
1654 .name
= "amiga-serial",
1658 module_platform_driver_probe(amiga_serial_driver
, amiga_serial_probe
);
1661 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1664 * ------------------------------------------------------------
1665 * Serial console driver
1666 * ------------------------------------------------------------
1669 static void amiga_serial_putc(char c
)
1671 custom
.serdat
= (unsigned char)c
| 0x100;
1672 while (!(custom
.serdatr
& 0x2000))
1677 * Print a string to the serial port trying not to disturb
1678 * any possible real use of the port...
1680 * The console must be locked when we get here.
1682 static void serial_console_write(struct console
*co
, const char *s
,
1685 unsigned short intena
= custom
.intenar
;
1687 custom
.intena
= IF_TBE
;
1691 amiga_serial_putc('\r');
1692 amiga_serial_putc(*s
++);
1695 custom
.intena
= IF_SETCLR
| (intena
& IF_TBE
);
1698 static struct tty_driver
*serial_console_device(struct console
*c
, int *index
)
1701 return serial_driver
;
1704 static struct console sercons
= {
1706 .write
= serial_console_write
,
1707 .device
= serial_console_device
,
1708 .flags
= CON_PRINTBUFFER
,
1715 static int __init
amiserial_console_init(void)
1720 register_console(&sercons
);
1723 console_initcall(amiserial_console_init
);
1725 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1727 MODULE_LICENSE("GPL");
1728 MODULE_ALIAS("platform:amiga-serial");