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
36 /* Set of debugging defines */
38 #undef SERIAL_DEBUG_INTR
39 #undef SERIAL_DEBUG_OPEN
40 #undef SERIAL_DEBUG_FLOW
41 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
45 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
46 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
47 tty->name, (info->tport.flags), serial_driver->refcount,info->count,tty->count,s)
53 * End of serial driver configuration section.
56 #include <linux/module.h>
58 #include <linux/types.h>
59 #include <linux/serial.h>
60 #include <linux/serial_reg.h>
61 static char *serial_version
= "4.30";
63 #include <linux/errno.h>
64 #include <linux/signal.h>
65 #include <linux/sched.h>
66 #include <linux/kernel.h>
67 #include <linux/timer.h>
68 #include <linux/interrupt.h>
69 #include <linux/tty.h>
70 #include <linux/tty_flip.h>
71 #include <linux/circ_buf.h>
72 #include <linux/console.h>
73 #include <linux/major.h>
74 #include <linux/string.h>
75 #include <linux/fcntl.h>
76 #include <linux/ptrace.h>
77 #include <linux/ioport.h>
79 #include <linux/seq_file.h>
80 #include <linux/slab.h>
81 #include <linux/init.h>
82 #include <linux/bitops.h>
83 #include <linux/platform_device.h>
85 #include <asm/setup.h>
90 #include <asm/amigahw.h>
91 #include <asm/amigaints.h>
94 struct tty_port tport
;
96 struct async_icount icount
;
102 int read_status_mask
;
103 int ignore_status_mask
;
106 int IER
; /* Interrupt Enable Register */
107 int MCR
; /* Modem control register */
108 int x_char
; /* xon/xoff character */
111 #define custom amiga_custom
112 static char *serial_name
= "Amiga-builtin serial driver";
114 static struct tty_driver
*serial_driver
;
116 /* number of characters left in xmit buffer before we ask for more */
117 #define WAKEUP_CHARS 256
119 static unsigned char current_ctl_bits
;
121 static void change_speed(struct tty_struct
*tty
, struct serial_state
*info
,
122 struct ktermios
*old
);
123 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
);
126 static struct serial_state rs_table
[1];
128 #define NR_PORTS ARRAY_SIZE(rs_table)
130 #include <linux/uaccess.h>
132 #define serial_isroot() (capable(CAP_SYS_ADMIN))
135 static inline int serial_paranoia_check(struct serial_state
*info
,
136 char *name
, const char *routine
)
138 #ifdef SERIAL_PARANOIA_CHECK
139 static const char *badmagic
=
140 "Warning: bad magic number for serial struct (%s) in %s\n";
141 static const char *badinfo
=
142 "Warning: null async_struct for (%s) in %s\n";
145 printk(badinfo
, name
, routine
);
148 if (info
->magic
!= SERIAL_MAGIC
) {
149 printk(badmagic
, name
, routine
);
156 /* some serial hardware definitions */
157 #define SDR_OVRUN (1<<15)
158 #define SDR_RBF (1<<14)
159 #define SDR_TBE (1<<13)
160 #define SDR_TSRE (1<<12)
162 #define SERPER_PARENB (1<<15)
164 #define AC_SETCLR (1<<15)
165 #define AC_UARTBRK (1<<11)
167 #define SER_DTR (1<<7)
168 #define SER_RTS (1<<6)
169 #define SER_DCD (1<<5)
170 #define SER_CTS (1<<4)
171 #define SER_DSR (1<<3)
173 static __inline__
void rtsdtr_ctrl(int bits
)
175 ciab
.pra
= ((bits
& (SER_RTS
| SER_DTR
)) ^ (SER_RTS
| SER_DTR
)) | (ciab
.pra
& ~(SER_RTS
| SER_DTR
));
179 * ------------------------------------------------------------
180 * rs_stop() and rs_start()
182 * This routines are called before setting or resetting tty->stopped.
183 * They enable or disable transmitter interrupts, as necessary.
184 * ------------------------------------------------------------
186 static void rs_stop(struct tty_struct
*tty
)
188 struct serial_state
*info
= tty
->driver_data
;
191 if (serial_paranoia_check(info
, tty
->name
, "rs_stop"))
194 local_irq_save(flags
);
195 if (info
->IER
& UART_IER_THRI
) {
196 info
->IER
&= ~UART_IER_THRI
;
197 /* disable Tx interrupt and remove any pending interrupts */
198 custom
.intena
= IF_TBE
;
200 custom
.intreq
= IF_TBE
;
203 local_irq_restore(flags
);
206 static void rs_start(struct tty_struct
*tty
)
208 struct serial_state
*info
= tty
->driver_data
;
211 if (serial_paranoia_check(info
, tty
->name
, "rs_start"))
214 local_irq_save(flags
);
215 if (info
->xmit
.head
!= info
->xmit
.tail
217 && !(info
->IER
& UART_IER_THRI
)) {
218 info
->IER
|= UART_IER_THRI
;
219 custom
.intena
= IF_SETCLR
| IF_TBE
;
221 /* set a pending Tx Interrupt, transmitter should restart now */
222 custom
.intreq
= IF_SETCLR
| IF_TBE
;
225 local_irq_restore(flags
);
229 * ----------------------------------------------------------------------
231 * Here starts the interrupt handling routines. All of the following
232 * subroutines are declared as inline and are folded into
233 * rs_interrupt(). They were separated out for readability's sake.
235 * Note: rs_interrupt() is a "fast" interrupt, which means that it
236 * runs with interrupts turned off. People who may want to modify
237 * rs_interrupt() should try to keep the interrupt handler as fast as
238 * possible. After you are done making modifications, it is not a bad
241 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
243 * and look at the resulting assemble code in serial.s.
245 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
246 * -----------------------------------------------------------------------
249 static void receive_chars(struct serial_state
*info
)
253 unsigned char ch
, flag
;
254 struct async_icount
*icount
;
257 icount
= &info
->icount
;
259 status
= UART_LSR_DR
; /* We obviously have a character! */
260 serdatr
= custom
.serdatr
;
262 custom
.intreq
= IF_RBF
;
265 if((serdatr
& 0x1ff) == 0)
266 status
|= UART_LSR_BI
;
267 if(serdatr
& SDR_OVRUN
)
268 status
|= UART_LSR_OE
;
273 #ifdef SERIAL_DEBUG_INTR
274 printk("DR%02x:%02x...", ch
, status
);
279 * We don't handle parity or frame errors - but I have left
280 * the code in, since I'm not sure that the errors can't be
284 if (status
& (UART_LSR_BI
| UART_LSR_PE
|
285 UART_LSR_FE
| UART_LSR_OE
)) {
287 * For statistics only
289 if (status
& UART_LSR_BI
) {
290 status
&= ~(UART_LSR_FE
| UART_LSR_PE
);
292 } else if (status
& UART_LSR_PE
)
294 else if (status
& UART_LSR_FE
)
296 if (status
& UART_LSR_OE
)
300 * Now check to see if character should be
301 * ignored, and mask off conditions which
304 if (status
& info
->ignore_status_mask
)
307 status
&= info
->read_status_mask
;
309 if (status
& (UART_LSR_BI
)) {
310 #ifdef SERIAL_DEBUG_INTR
311 printk("handling break....");
314 if (info
->tport
.flags
& ASYNC_SAK
)
315 do_SAK(info
->tport
.tty
);
316 } else if (status
& UART_LSR_PE
)
318 else if (status
& UART_LSR_FE
)
320 if (status
& UART_LSR_OE
) {
322 * Overrun is special, since it's
323 * reported immediately, and doesn't
324 * affect the current character
329 tty_insert_flip_char(&info
->tport
, ch
, flag
);
331 tty_insert_flip_char(&info
->tport
, 0, TTY_OVERRUN
);
332 tty_flip_buffer_push(&info
->tport
);
337 static void transmit_chars(struct serial_state
*info
)
339 custom
.intreq
= IF_TBE
;
342 custom
.serdat
= info
->x_char
| 0x100;
348 if (info
->xmit
.head
== info
->xmit
.tail
349 || info
->tport
.tty
->stopped
350 || info
->tport
.tty
->hw_stopped
) {
351 info
->IER
&= ~UART_IER_THRI
;
352 custom
.intena
= IF_TBE
;
357 custom
.serdat
= info
->xmit
.buf
[info
->xmit
.tail
++] | 0x100;
359 info
->xmit
.tail
= info
->xmit
.tail
& (SERIAL_XMIT_SIZE
-1);
362 if (CIRC_CNT(info
->xmit
.head
,
364 SERIAL_XMIT_SIZE
) < WAKEUP_CHARS
)
365 tty_wakeup(info
->tport
.tty
);
367 #ifdef SERIAL_DEBUG_INTR
370 if (info
->xmit
.head
== info
->xmit
.tail
) {
371 custom
.intena
= IF_TBE
;
373 info
->IER
&= ~UART_IER_THRI
;
377 static void check_modem_status(struct serial_state
*info
)
379 struct tty_port
*port
= &info
->tport
;
380 unsigned char status
= ciab
.pra
& (SER_DCD
| SER_CTS
| SER_DSR
);
381 unsigned char dstatus
;
382 struct async_icount
*icount
;
384 /* Determine bits that have changed */
385 dstatus
= status
^ current_ctl_bits
;
386 current_ctl_bits
= status
;
389 icount
= &info
->icount
;
390 /* update input line counters */
391 if (dstatus
& SER_DSR
)
393 if (dstatus
& SER_DCD
) {
396 if (dstatus
& SER_CTS
)
398 wake_up_interruptible(&port
->delta_msr_wait
);
401 if (tty_port_check_carrier(port
) && (dstatus
& SER_DCD
)) {
402 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
403 printk("ttyS%d CD now %s...", info
->line
,
404 (!(status
& SER_DCD
)) ? "on" : "off");
406 if (!(status
& SER_DCD
))
407 wake_up_interruptible(&port
->open_wait
);
409 #ifdef SERIAL_DEBUG_OPEN
410 printk("doing serial hangup...");
413 tty_hangup(port
->tty
);
416 if (tty_port_cts_enabled(port
)) {
417 if (port
->tty
->hw_stopped
) {
418 if (!(status
& SER_CTS
)) {
419 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
420 printk("CTS tx start...");
422 port
->tty
->hw_stopped
= 0;
423 info
->IER
|= UART_IER_THRI
;
424 custom
.intena
= IF_SETCLR
| IF_TBE
;
426 /* set a pending Tx Interrupt, transmitter should restart now */
427 custom
.intreq
= IF_SETCLR
| IF_TBE
;
429 tty_wakeup(port
->tty
);
433 if ((status
& SER_CTS
)) {
434 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
435 printk("CTS tx stop...");
437 port
->tty
->hw_stopped
= 1;
438 info
->IER
&= ~UART_IER_THRI
;
439 /* disable Tx interrupt and remove any pending interrupts */
440 custom
.intena
= IF_TBE
;
442 custom
.intreq
= IF_TBE
;
449 static irqreturn_t
ser_vbl_int( int irq
, void *data
)
451 /* vbl is just a periodic interrupt we tie into to update modem status */
452 struct serial_state
*info
= data
;
454 * TBD - is it better to unregister from this interrupt or to
455 * ignore it if MSI is clear ?
457 if(info
->IER
& UART_IER_MSI
)
458 check_modem_status(info
);
462 static irqreturn_t
ser_rx_int(int irq
, void *dev_id
)
464 struct serial_state
*info
= dev_id
;
466 #ifdef SERIAL_DEBUG_INTR
467 printk("ser_rx_int...");
470 if (!info
->tport
.tty
)
474 #ifdef SERIAL_DEBUG_INTR
480 static irqreturn_t
ser_tx_int(int irq
, void *dev_id
)
482 struct serial_state
*info
= dev_id
;
484 if (custom
.serdatr
& SDR_TBE
) {
485 #ifdef SERIAL_DEBUG_INTR
486 printk("ser_tx_int...");
489 if (!info
->tport
.tty
)
492 transmit_chars(info
);
493 #ifdef SERIAL_DEBUG_INTR
501 * -------------------------------------------------------------------
502 * Here ends the serial interrupt routines.
503 * -------------------------------------------------------------------
507 * ---------------------------------------------------------------
508 * Low level utility subroutines for the serial driver: routines to
509 * figure out the appropriate timeout for an interrupt chain, routines
510 * to initialize and startup a serial port, and routines to shutdown a
511 * serial port. Useful stuff like that.
512 * ---------------------------------------------------------------
515 static int startup(struct tty_struct
*tty
, struct serial_state
*info
)
517 struct tty_port
*port
= &info
->tport
;
522 page
= get_zeroed_page(GFP_KERNEL
);
526 local_irq_save(flags
);
528 if (tty_port_initialized(port
)) {
536 info
->xmit
.buf
= (unsigned char *) page
;
538 #ifdef SERIAL_DEBUG_OPEN
539 printk("starting up ttys%d ...", info
->line
);
542 /* Clear anything in the input buffer */
544 custom
.intreq
= IF_RBF
;
547 retval
= request_irq(IRQ_AMIGA_VERTB
, ser_vbl_int
, 0, "serial status", info
);
549 if (serial_isroot()) {
550 set_bit(TTY_IO_ERROR
, &tty
->flags
);
556 /* enable both Rx and Tx interrupts */
557 custom
.intena
= IF_SETCLR
| IF_RBF
| IF_TBE
;
559 info
->IER
= UART_IER_MSI
;
561 /* remember current state of the DCD and CTS bits */
562 current_ctl_bits
= ciab
.pra
& (SER_DCD
| SER_CTS
| SER_DSR
);
566 info
->MCR
= SER_DTR
| SER_RTS
;
567 rtsdtr_ctrl(info
->MCR
);
569 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
570 info
->xmit
.head
= info
->xmit
.tail
= 0;
573 * and set the speed of the serial port
575 change_speed(tty
, info
, NULL
);
577 tty_port_set_initialized(port
, 1);
578 local_irq_restore(flags
);
582 local_irq_restore(flags
);
587 * This routine will shutdown a serial port; interrupts are disabled, and
588 * DTR is dropped if the hangup on close termio flag is on.
590 static void shutdown(struct tty_struct
*tty
, struct serial_state
*info
)
593 struct serial_state
*state
;
595 if (!tty_port_initialized(&info
->tport
))
600 #ifdef SERIAL_DEBUG_OPEN
601 printk("Shutting down serial port %d ....\n", info
->line
);
604 local_irq_save(flags
); /* Disable interrupts */
607 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
608 * here so the queue might never be waken up
610 wake_up_interruptible(&info
->tport
.delta_msr_wait
);
613 * Free the IRQ, if necessary
615 free_irq(IRQ_AMIGA_VERTB
, info
);
617 if (info
->xmit
.buf
) {
618 free_page((unsigned long) info
->xmit
.buf
);
619 info
->xmit
.buf
= NULL
;
623 custom
.intena
= IF_RBF
| IF_TBE
;
626 /* disable break condition */
627 custom
.adkcon
= AC_UARTBRK
;
631 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
632 rtsdtr_ctrl(info
->MCR
);
634 set_bit(TTY_IO_ERROR
, &tty
->flags
);
636 tty_port_set_initialized(&info
->tport
, 0);
637 local_irq_restore(flags
);
642 * This routine is called to set the UART divisor registers to match
643 * the specified baud rate for a serial port.
645 static void change_speed(struct tty_struct
*tty
, struct serial_state
*info
,
646 struct ktermios
*old_termios
)
648 struct tty_port
*port
= &info
->tport
;
649 int quot
= 0, baud_base
, baud
;
650 unsigned cflag
, cval
= 0;
654 cflag
= tty
->termios
.c_cflag
;
656 /* Byte size is always 8 bits plus parity bit if requested */
659 if (cflag
& CSTOPB
) {
663 if (cflag
& PARENB
) {
664 cval
|= UART_LCR_PARITY
;
667 if (!(cflag
& PARODD
))
668 cval
|= UART_LCR_EPAR
;
671 cval
|= UART_LCR_SPAR
;
674 /* Determine divisor based on baud rate */
675 baud
= tty_get_baud_rate(tty
);
677 baud
= 9600; /* B0 transition handled in rs_set_termios */
678 baud_base
= info
->baud_base
;
679 if (baud
== 38400 && (port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
)
680 quot
= info
->custom_divisor
;
683 /* Special case since 134 is really 134.5 */
684 quot
= (2*baud_base
/ 269);
686 quot
= baud_base
/ baud
;
688 /* If the quotient is zero refuse the change */
689 if (!quot
&& old_termios
) {
690 /* FIXME: Will need updating for new tty in the end */
691 tty
->termios
.c_cflag
&= ~CBAUD
;
692 tty
->termios
.c_cflag
|= (old_termios
->c_cflag
& CBAUD
);
693 baud
= tty_get_baud_rate(tty
);
697 (port
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
)
698 quot
= info
->custom_divisor
;
701 /* Special case since 134 is really 134.5 */
702 quot
= (2*baud_base
/ 269);
704 quot
= baud_base
/ baud
;
707 /* As a last resort, if the quotient is zero, default to 9600 bps */
709 quot
= baud_base
/ 9600;
711 info
->timeout
= ((info
->xmit_fifo_size
*HZ
*bits
*quot
) / baud_base
);
712 info
->timeout
+= HZ
/50; /* Add .02 seconds of slop */
714 /* CTS flow control flag and modem status interrupts */
715 info
->IER
&= ~UART_IER_MSI
;
716 if (port
->flags
& ASYNC_HARDPPS_CD
)
717 info
->IER
|= UART_IER_MSI
;
718 tty_port_set_cts_flow(port
, cflag
& CRTSCTS
);
720 info
->IER
|= UART_IER_MSI
;
721 tty_port_set_check_carrier(port
, ~cflag
& CLOCAL
);
723 info
->IER
|= UART_IER_MSI
;
725 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
729 * Set up parity check flag
732 info
->read_status_mask
= UART_LSR_OE
| UART_LSR_DR
;
734 info
->read_status_mask
|= UART_LSR_FE
| UART_LSR_PE
;
735 if (I_BRKINT(tty
) || I_PARMRK(tty
))
736 info
->read_status_mask
|= UART_LSR_BI
;
739 * Characters to ignore
741 info
->ignore_status_mask
= 0;
743 info
->ignore_status_mask
|= UART_LSR_PE
| UART_LSR_FE
;
745 info
->ignore_status_mask
|= UART_LSR_BI
;
747 * If we're ignore parity and break indicators, ignore
748 * overruns too. (For real raw support).
751 info
->ignore_status_mask
|= UART_LSR_OE
;
754 * !!! ignore all characters if CREAD is not set
756 if ((cflag
& CREAD
) == 0)
757 info
->ignore_status_mask
|= UART_LSR_DR
;
758 local_irq_save(flags
);
763 /* Set up the baud rate */
766 /* Enable or disable parity bit */
768 if(cval
& UART_LCR_PARITY
)
769 serper
|= (SERPER_PARENB
);
771 custom
.serper
= serper
;
775 local_irq_restore(flags
);
778 static int rs_put_char(struct tty_struct
*tty
, unsigned char ch
)
780 struct serial_state
*info
;
783 info
= tty
->driver_data
;
785 if (serial_paranoia_check(info
, tty
->name
, "rs_put_char"))
791 local_irq_save(flags
);
792 if (CIRC_SPACE(info
->xmit
.head
,
794 SERIAL_XMIT_SIZE
) == 0) {
795 local_irq_restore(flags
);
799 info
->xmit
.buf
[info
->xmit
.head
++] = ch
;
800 info
->xmit
.head
&= SERIAL_XMIT_SIZE
-1;
801 local_irq_restore(flags
);
805 static void rs_flush_chars(struct tty_struct
*tty
)
807 struct serial_state
*info
= tty
->driver_data
;
810 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_chars"))
813 if (info
->xmit
.head
== info
->xmit
.tail
819 local_irq_save(flags
);
820 info
->IER
|= UART_IER_THRI
;
821 custom
.intena
= IF_SETCLR
| IF_TBE
;
823 /* set a pending Tx Interrupt, transmitter should restart now */
824 custom
.intreq
= IF_SETCLR
| IF_TBE
;
826 local_irq_restore(flags
);
829 static int rs_write(struct tty_struct
* tty
, const unsigned char *buf
, int count
)
832 struct serial_state
*info
= tty
->driver_data
;
835 if (serial_paranoia_check(info
, tty
->name
, "rs_write"))
841 local_irq_save(flags
);
843 c
= CIRC_SPACE_TO_END(info
->xmit
.head
,
851 memcpy(info
->xmit
.buf
+ info
->xmit
.head
, buf
, c
);
852 info
->xmit
.head
= ((info
->xmit
.head
+ c
) &
853 (SERIAL_XMIT_SIZE
-1));
858 local_irq_restore(flags
);
860 if (info
->xmit
.head
!= info
->xmit
.tail
863 && !(info
->IER
& UART_IER_THRI
)) {
864 info
->IER
|= UART_IER_THRI
;
866 custom
.intena
= IF_SETCLR
| IF_TBE
;
868 /* set a pending Tx Interrupt, transmitter should restart now */
869 custom
.intreq
= IF_SETCLR
| IF_TBE
;
871 local_irq_restore(flags
);
876 static int rs_write_room(struct tty_struct
*tty
)
878 struct serial_state
*info
= tty
->driver_data
;
880 if (serial_paranoia_check(info
, tty
->name
, "rs_write_room"))
882 return CIRC_SPACE(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
885 static int rs_chars_in_buffer(struct tty_struct
*tty
)
887 struct serial_state
*info
= tty
->driver_data
;
889 if (serial_paranoia_check(info
, tty
->name
, "rs_chars_in_buffer"))
891 return CIRC_CNT(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
894 static void rs_flush_buffer(struct tty_struct
*tty
)
896 struct serial_state
*info
= tty
->driver_data
;
899 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_buffer"))
901 local_irq_save(flags
);
902 info
->xmit
.head
= info
->xmit
.tail
= 0;
903 local_irq_restore(flags
);
908 * This function is used to send a high-priority XON/XOFF character to
911 static void rs_send_xchar(struct tty_struct
*tty
, char ch
)
913 struct serial_state
*info
= tty
->driver_data
;
916 if (serial_paranoia_check(info
, tty
->name
, "rs_send_xchar"))
921 /* Make sure transmit interrupts are on */
924 local_irq_save(flags
);
925 if(!(custom
.intenar
& IF_TBE
)) {
926 custom
.intena
= IF_SETCLR
| IF_TBE
;
928 /* set a pending Tx Interrupt, transmitter should restart now */
929 custom
.intreq
= IF_SETCLR
| IF_TBE
;
932 local_irq_restore(flags
);
934 info
->IER
|= UART_IER_THRI
;
939 * ------------------------------------------------------------
942 * This routine is called by the upper-layer tty layer to signal that
943 * incoming characters should be throttled.
944 * ------------------------------------------------------------
946 static void rs_throttle(struct tty_struct
* tty
)
948 struct serial_state
*info
= tty
->driver_data
;
950 #ifdef SERIAL_DEBUG_THROTTLE
951 printk("throttle %s ....\n", tty_name(tty
));
954 if (serial_paranoia_check(info
, tty
->name
, "rs_throttle"))
958 rs_send_xchar(tty
, STOP_CHAR(tty
));
961 info
->MCR
&= ~SER_RTS
;
963 local_irq_save(flags
);
964 rtsdtr_ctrl(info
->MCR
);
965 local_irq_restore(flags
);
968 static void rs_unthrottle(struct tty_struct
* tty
)
970 struct serial_state
*info
= tty
->driver_data
;
972 #ifdef SERIAL_DEBUG_THROTTLE
973 printk("unthrottle %s ....\n", tty_name(tty
));
976 if (serial_paranoia_check(info
, tty
->name
, "rs_unthrottle"))
983 rs_send_xchar(tty
, START_CHAR(tty
));
986 info
->MCR
|= SER_RTS
;
987 local_irq_save(flags
);
988 rtsdtr_ctrl(info
->MCR
);
989 local_irq_restore(flags
);
993 * ------------------------------------------------------------
994 * rs_ioctl() and friends
995 * ------------------------------------------------------------
998 static int get_serial_info(struct tty_struct
*tty
, struct serial_state
*state
,
999 struct serial_struct __user
* retinfo
)
1001 struct serial_struct tmp
;
1003 memset(&tmp
, 0, sizeof(tmp
));
1005 tmp
.line
= tty
->index
;
1006 tmp
.port
= state
->port
;
1007 tmp
.flags
= state
->tport
.flags
;
1008 tmp
.xmit_fifo_size
= state
->xmit_fifo_size
;
1009 tmp
.baud_base
= state
->baud_base
;
1010 tmp
.close_delay
= state
->tport
.close_delay
;
1011 tmp
.closing_wait
= state
->tport
.closing_wait
;
1012 tmp
.custom_divisor
= state
->custom_divisor
;
1014 if (copy_to_user(retinfo
,&tmp
,sizeof(*retinfo
)))
1019 static int set_serial_info(struct tty_struct
*tty
, struct serial_state
*state
,
1020 struct serial_struct __user
* new_info
)
1022 struct tty_port
*port
= &state
->tport
;
1023 struct serial_struct new_serial
;
1027 if (copy_from_user(&new_serial
,new_info
,sizeof(new_serial
)))
1031 change_spd
= ((new_serial
.flags
^ port
->flags
) & ASYNC_SPD_MASK
) ||
1032 new_serial
.custom_divisor
!= state
->custom_divisor
;
1033 if (new_serial
.irq
|| new_serial
.port
!= state
->port
||
1034 new_serial
.xmit_fifo_size
!= state
->xmit_fifo_size
) {
1039 if (!serial_isroot()) {
1040 if ((new_serial
.baud_base
!= state
->baud_base
) ||
1041 (new_serial
.close_delay
!= port
->close_delay
) ||
1042 (new_serial
.xmit_fifo_size
!= state
->xmit_fifo_size
) ||
1043 ((new_serial
.flags
& ~ASYNC_USR_MASK
) !=
1044 (port
->flags
& ~ASYNC_USR_MASK
))) {
1048 port
->flags
= ((port
->flags
& ~ASYNC_USR_MASK
) |
1049 (new_serial
.flags
& ASYNC_USR_MASK
));
1050 state
->custom_divisor
= new_serial
.custom_divisor
;
1051 goto check_and_exit
;
1054 if (new_serial
.baud_base
< 9600) {
1060 * OK, past this point, all the error checking has been done.
1061 * At this point, we start making changes.....
1064 state
->baud_base
= new_serial
.baud_base
;
1065 port
->flags
= ((port
->flags
& ~ASYNC_FLAGS
) |
1066 (new_serial
.flags
& ASYNC_FLAGS
));
1067 state
->custom_divisor
= new_serial
.custom_divisor
;
1068 port
->close_delay
= new_serial
.close_delay
* HZ
/100;
1069 port
->closing_wait
= new_serial
.closing_wait
* HZ
/100;
1070 port
->low_latency
= (port
->flags
& ASYNC_LOW_LATENCY
) ? 1 : 0;
1073 if (tty_port_initialized(port
)) {
1075 /* warn about deprecation unless clearing */
1076 if (new_serial
.flags
& ASYNC_SPD_MASK
)
1077 dev_warn_ratelimited(tty
->dev
, "use of SPD flags is deprecated\n");
1078 change_speed(tty
, state
, NULL
);
1081 retval
= startup(tty
, state
);
1088 * get_lsr_info - get line status register info
1090 * Purpose: Let user call ioctl() to get info when the UART physically
1091 * is emptied. On bus types like RS485, the transmitter must
1092 * release the bus after transmitting. This must be done when
1093 * the transmit shift register is empty, not be done when the
1094 * transmit holding register is empty. This functionality
1095 * allows an RS485 driver to be written in user space.
1097 static int get_lsr_info(struct serial_state
*info
, unsigned int __user
*value
)
1099 unsigned char status
;
1100 unsigned int result
;
1101 unsigned long flags
;
1103 local_irq_save(flags
);
1104 status
= custom
.serdatr
;
1106 local_irq_restore(flags
);
1107 result
= ((status
& SDR_TSRE
) ? TIOCSER_TEMT
: 0);
1108 if (copy_to_user(value
, &result
, sizeof(int)))
1114 static int rs_tiocmget(struct tty_struct
*tty
)
1116 struct serial_state
*info
= tty
->driver_data
;
1117 unsigned char control
, status
;
1118 unsigned long flags
;
1120 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1122 if (tty_io_error(tty
))
1125 control
= info
->MCR
;
1126 local_irq_save(flags
);
1128 local_irq_restore(flags
);
1129 return ((control
& SER_RTS
) ? TIOCM_RTS
: 0)
1130 | ((control
& SER_DTR
) ? TIOCM_DTR
: 0)
1131 | (!(status
& SER_DCD
) ? TIOCM_CAR
: 0)
1132 | (!(status
& SER_DSR
) ? TIOCM_DSR
: 0)
1133 | (!(status
& SER_CTS
) ? TIOCM_CTS
: 0);
1136 static int rs_tiocmset(struct tty_struct
*tty
, unsigned int set
,
1139 struct serial_state
*info
= tty
->driver_data
;
1140 unsigned long flags
;
1142 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1144 if (tty_io_error(tty
))
1147 local_irq_save(flags
);
1148 if (set
& TIOCM_RTS
)
1149 info
->MCR
|= SER_RTS
;
1150 if (set
& TIOCM_DTR
)
1151 info
->MCR
|= SER_DTR
;
1152 if (clear
& TIOCM_RTS
)
1153 info
->MCR
&= ~SER_RTS
;
1154 if (clear
& TIOCM_DTR
)
1155 info
->MCR
&= ~SER_DTR
;
1156 rtsdtr_ctrl(info
->MCR
);
1157 local_irq_restore(flags
);
1162 * rs_break() --- routine which turns the break handling on or off
1164 static int rs_break(struct tty_struct
*tty
, int break_state
)
1166 struct serial_state
*info
= tty
->driver_data
;
1167 unsigned long flags
;
1169 if (serial_paranoia_check(info
, tty
->name
, "rs_break"))
1172 local_irq_save(flags
);
1173 if (break_state
== -1)
1174 custom
.adkcon
= AC_SETCLR
| AC_UARTBRK
;
1176 custom
.adkcon
= AC_UARTBRK
;
1178 local_irq_restore(flags
);
1183 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1184 * Return: write counters to the user passed counter struct
1185 * NB: both 1->0 and 0->1 transitions are counted except for
1186 * RI where only 0->1 is counted.
1188 static int rs_get_icount(struct tty_struct
*tty
,
1189 struct serial_icounter_struct
*icount
)
1191 struct serial_state
*info
= tty
->driver_data
;
1192 struct async_icount cnow
;
1193 unsigned long flags
;
1195 local_irq_save(flags
);
1196 cnow
= info
->icount
;
1197 local_irq_restore(flags
);
1198 icount
->cts
= cnow
.cts
;
1199 icount
->dsr
= cnow
.dsr
;
1200 icount
->rng
= cnow
.rng
;
1201 icount
->dcd
= cnow
.dcd
;
1202 icount
->rx
= cnow
.rx
;
1203 icount
->tx
= cnow
.tx
;
1204 icount
->frame
= cnow
.frame
;
1205 icount
->overrun
= cnow
.overrun
;
1206 icount
->parity
= cnow
.parity
;
1207 icount
->brk
= cnow
.brk
;
1208 icount
->buf_overrun
= cnow
.buf_overrun
;
1213 static int rs_ioctl(struct tty_struct
*tty
,
1214 unsigned int cmd
, unsigned long arg
)
1216 struct serial_state
*info
= tty
->driver_data
;
1217 struct async_icount cprev
, cnow
; /* kernel counter temps */
1218 void __user
*argp
= (void __user
*)arg
;
1219 unsigned long flags
;
1223 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1226 if ((cmd
!= TIOCGSERIAL
) && (cmd
!= TIOCSSERIAL
) &&
1227 (cmd
!= TIOCSERCONFIG
) && (cmd
!= TIOCSERGSTRUCT
) &&
1228 (cmd
!= TIOCMIWAIT
) && (cmd
!= TIOCGICOUNT
)) {
1229 if (tty_io_error(tty
))
1235 return get_serial_info(tty
, info
, argp
);
1237 return set_serial_info(tty
, info
, argp
);
1241 case TIOCSERGETLSR
: /* Get line status register */
1242 return get_lsr_info(info
, argp
);
1244 case TIOCSERGSTRUCT
:
1245 if (copy_to_user(argp
,
1246 info
, sizeof(struct serial_state
)))
1251 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1252 * - mask passed in arg for lines of interest
1253 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1254 * Caller should use TIOCGICOUNT to see which one it was
1257 local_irq_save(flags
);
1258 /* note the counters on entry */
1259 cprev
= info
->icount
;
1260 local_irq_restore(flags
);
1262 prepare_to_wait(&info
->tport
.delta_msr_wait
,
1263 &wait
, TASK_INTERRUPTIBLE
);
1264 local_irq_save(flags
);
1265 cnow
= info
->icount
; /* atomic copy */
1266 local_irq_restore(flags
);
1267 if (cnow
.rng
== cprev
.rng
&& cnow
.dsr
== cprev
.dsr
&&
1268 cnow
.dcd
== cprev
.dcd
&& cnow
.cts
== cprev
.cts
) {
1269 ret
= -EIO
; /* no change => error */
1272 if ( ((arg
& TIOCM_RNG
) && (cnow
.rng
!= cprev
.rng
)) ||
1273 ((arg
& TIOCM_DSR
) && (cnow
.dsr
!= cprev
.dsr
)) ||
1274 ((arg
& TIOCM_CD
) && (cnow
.dcd
!= cprev
.dcd
)) ||
1275 ((arg
& TIOCM_CTS
) && (cnow
.cts
!= cprev
.cts
)) ) {
1280 /* see if a signal did it */
1281 if (signal_pending(current
)) {
1287 finish_wait(&info
->tport
.delta_msr_wait
, &wait
);
1292 /* "setserial -W" is called in Debian boot */
1293 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1297 return -ENOIOCTLCMD
;
1302 static void rs_set_termios(struct tty_struct
*tty
, struct ktermios
*old_termios
)
1304 struct serial_state
*info
= tty
->driver_data
;
1305 unsigned long flags
;
1306 unsigned int cflag
= tty
->termios
.c_cflag
;
1308 change_speed(tty
, info
, old_termios
);
1310 /* Handle transition to B0 status */
1311 if ((old_termios
->c_cflag
& CBAUD
) && !(cflag
& CBAUD
)) {
1312 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
1313 local_irq_save(flags
);
1314 rtsdtr_ctrl(info
->MCR
);
1315 local_irq_restore(flags
);
1318 /* Handle transition away from B0 status */
1319 if (!(old_termios
->c_cflag
& CBAUD
) && (cflag
& CBAUD
)) {
1320 info
->MCR
|= SER_DTR
;
1321 if (!C_CRTSCTS(tty
) || !tty_throttled(tty
))
1322 info
->MCR
|= SER_RTS
;
1323 local_irq_save(flags
);
1324 rtsdtr_ctrl(info
->MCR
);
1325 local_irq_restore(flags
);
1328 /* Handle turning off CRTSCTS */
1329 if ((old_termios
->c_cflag
& CRTSCTS
) && !C_CRTSCTS(tty
)) {
1330 tty
->hw_stopped
= 0;
1336 * No need to wake up processes in open wait, since they
1337 * sample the CLOCAL flag once, and don't recheck it.
1338 * XXX It's not clear whether the current behavior is correct
1339 * or not. Hence, this may change.....
1341 if (!(old_termios
->c_cflag
& CLOCAL
) && C_CLOCAL(tty
))
1342 wake_up_interruptible(&info
->open_wait
);
1347 * ------------------------------------------------------------
1350 * This routine is called when the serial port gets closed. First, we
1351 * wait for the last remaining data to be sent. Then, we unlink its
1352 * async structure from the interrupt chain if necessary, and we free
1353 * that IRQ if nothing is left in the chain.
1354 * ------------------------------------------------------------
1356 static void rs_close(struct tty_struct
*tty
, struct file
* filp
)
1358 struct serial_state
*state
= tty
->driver_data
;
1359 struct tty_port
*port
= &state
->tport
;
1361 if (serial_paranoia_check(state
, tty
->name
, "rs_close"))
1364 if (tty_port_close_start(port
, tty
, filp
) == 0)
1368 * At this point we stop accepting input. To do this, we
1369 * disable the receive line status interrupts, and tell the
1370 * interrupt driver to stop checking the data ready bit in the
1371 * line status register.
1373 state
->read_status_mask
&= ~UART_LSR_DR
;
1374 if (tty_port_initialized(port
)) {
1375 /* disable receive interrupts */
1376 custom
.intena
= IF_RBF
;
1378 /* clear any pending receive interrupt */
1379 custom
.intreq
= IF_RBF
;
1383 * Before we drop DTR, make sure the UART transmitter
1384 * has completely drained; this is especially
1385 * important if there is a transmit FIFO!
1387 rs_wait_until_sent(tty
, state
->timeout
);
1389 shutdown(tty
, state
);
1390 rs_flush_buffer(tty
);
1392 tty_ldisc_flush(tty
);
1395 tty_port_close_end(port
, tty
);
1399 * rs_wait_until_sent() --- wait until the transmitter is empty
1401 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
)
1403 struct serial_state
*info
= tty
->driver_data
;
1404 unsigned long orig_jiffies
, char_time
;
1407 if (serial_paranoia_check(info
, tty
->name
, "rs_wait_until_sent"))
1410 if (info
->xmit_fifo_size
== 0)
1411 return; /* Just in case.... */
1413 orig_jiffies
= jiffies
;
1416 * Set the check interval to be 1/5 of the estimated time to
1417 * send a single character, and make it at least 1. The check
1418 * interval should also be less than the timeout.
1420 * Note: we have to use pretty tight timings here to satisfy
1423 char_time
= (info
->timeout
- HZ
/50) / info
->xmit_fifo_size
;
1424 char_time
= char_time
/ 5;
1428 char_time
= min_t(unsigned long, char_time
, timeout
);
1430 * If the transmitter hasn't cleared in twice the approximate
1431 * amount of time to send the entire FIFO, it probably won't
1432 * ever clear. This assumes the UART isn't doing flow
1433 * control, which is currently the case. Hence, if it ever
1434 * takes longer than info->timeout, this is probably due to a
1435 * UART bug of some kind. So, we clamp the timeout parameter at
1438 if (!timeout
|| timeout
> 2*info
->timeout
)
1439 timeout
= 2*info
->timeout
;
1440 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1441 printk("In rs_wait_until_sent(%d) check=%lu...", timeout
, char_time
);
1442 printk("jiff=%lu...", jiffies
);
1444 while(!((lsr
= custom
.serdatr
) & SDR_TSRE
)) {
1445 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1446 printk("serdatr = %d (jiff=%lu)...", lsr
, jiffies
);
1448 msleep_interruptible(jiffies_to_msecs(char_time
));
1449 if (signal_pending(current
))
1451 if (timeout
&& time_after(jiffies
, orig_jiffies
+ timeout
))
1454 __set_current_state(TASK_RUNNING
);
1456 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1457 printk("lsr = %d (jiff=%lu)...done\n", lsr
, jiffies
);
1462 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1464 static void rs_hangup(struct tty_struct
*tty
)
1466 struct serial_state
*info
= tty
->driver_data
;
1468 if (serial_paranoia_check(info
, tty
->name
, "rs_hangup"))
1471 rs_flush_buffer(tty
);
1472 shutdown(tty
, info
);
1473 info
->tport
.count
= 0;
1474 tty_port_set_active(&info
->tport
, 0);
1475 info
->tport
.tty
= NULL
;
1476 wake_up_interruptible(&info
->tport
.open_wait
);
1480 * This routine is called whenever a serial port is opened. It
1481 * enables interrupts for a serial port, linking in its async structure into
1482 * the IRQ chain. It also performs the serial-specific
1483 * initialization for the tty structure.
1485 static int rs_open(struct tty_struct
*tty
, struct file
* filp
)
1487 struct serial_state
*info
= rs_table
+ tty
->index
;
1488 struct tty_port
*port
= &info
->tport
;
1493 tty
->driver_data
= info
;
1495 if (serial_paranoia_check(info
, tty
->name
, "rs_open"))
1498 port
->low_latency
= (port
->flags
& ASYNC_LOW_LATENCY
) ? 1 : 0;
1500 retval
= startup(tty
, info
);
1505 return tty_port_block_til_ready(port
, tty
, filp
);
1509 * /proc fs routines....
1512 static inline void line_info(struct seq_file
*m
, int line
,
1513 struct serial_state
*state
)
1515 char stat_buf
[30], control
, status
;
1516 unsigned long flags
;
1518 seq_printf(m
, "%d: uart:amiga_builtin", line
);
1520 local_irq_save(flags
);
1522 control
= tty_port_initialized(&state
->tport
) ? state
->MCR
: status
;
1523 local_irq_restore(flags
);
1527 if(!(control
& SER_RTS
))
1528 strcat(stat_buf
, "|RTS");
1529 if(!(status
& SER_CTS
))
1530 strcat(stat_buf
, "|CTS");
1531 if(!(control
& SER_DTR
))
1532 strcat(stat_buf
, "|DTR");
1533 if(!(status
& SER_DSR
))
1534 strcat(stat_buf
, "|DSR");
1535 if(!(status
& SER_DCD
))
1536 strcat(stat_buf
, "|CD");
1539 seq_printf(m
, " baud:%d", state
->baud_base
/ state
->quot
);
1541 seq_printf(m
, " tx:%d rx:%d", state
->icount
.tx
, state
->icount
.rx
);
1543 if (state
->icount
.frame
)
1544 seq_printf(m
, " fe:%d", state
->icount
.frame
);
1546 if (state
->icount
.parity
)
1547 seq_printf(m
, " pe:%d", state
->icount
.parity
);
1549 if (state
->icount
.brk
)
1550 seq_printf(m
, " brk:%d", state
->icount
.brk
);
1552 if (state
->icount
.overrun
)
1553 seq_printf(m
, " oe:%d", state
->icount
.overrun
);
1556 * Last thing is the RS-232 status lines
1558 seq_printf(m
, " %s\n", stat_buf
+1);
1561 static int rs_proc_show(struct seq_file
*m
, void *v
)
1563 seq_printf(m
, "serinfo:1.0 driver:%s\n", serial_version
);
1564 line_info(m
, 0, &rs_table
[0]);
1568 static int rs_proc_open(struct inode
*inode
, struct file
*file
)
1570 return single_open(file
, rs_proc_show
, NULL
);
1573 static const struct file_operations rs_proc_fops
= {
1574 .owner
= THIS_MODULE
,
1575 .open
= rs_proc_open
,
1577 .llseek
= seq_lseek
,
1578 .release
= single_release
,
1582 * ---------------------------------------------------------------------
1583 * rs_init() and friends
1585 * rs_init() is called at boot-time to initialize the serial driver.
1586 * ---------------------------------------------------------------------
1590 * This routine prints out the appropriate serial driver version
1591 * number, and identifies which options were configured into this
1594 static void show_serial_version(void)
1596 printk(KERN_INFO
"%s version %s\n", serial_name
, serial_version
);
1600 static const struct tty_operations serial_ops
= {
1604 .put_char
= rs_put_char
,
1605 .flush_chars
= rs_flush_chars
,
1606 .write_room
= rs_write_room
,
1607 .chars_in_buffer
= rs_chars_in_buffer
,
1608 .flush_buffer
= rs_flush_buffer
,
1610 .throttle
= rs_throttle
,
1611 .unthrottle
= rs_unthrottle
,
1612 .set_termios
= rs_set_termios
,
1615 .hangup
= rs_hangup
,
1616 .break_ctl
= rs_break
,
1617 .send_xchar
= rs_send_xchar
,
1618 .wait_until_sent
= rs_wait_until_sent
,
1619 .tiocmget
= rs_tiocmget
,
1620 .tiocmset
= rs_tiocmset
,
1621 .get_icount
= rs_get_icount
,
1622 .proc_fops
= &rs_proc_fops
,
1625 static int amiga_carrier_raised(struct tty_port
*port
)
1627 return !(ciab
.pra
& SER_DCD
);
1630 static void amiga_dtr_rts(struct tty_port
*port
, int raise
)
1632 struct serial_state
*info
= container_of(port
, struct serial_state
,
1634 unsigned long flags
;
1637 info
->MCR
|= SER_DTR
|SER_RTS
;
1639 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
1641 local_irq_save(flags
);
1642 rtsdtr_ctrl(info
->MCR
);
1643 local_irq_restore(flags
);
1646 static const struct tty_port_operations amiga_port_ops
= {
1647 .carrier_raised
= amiga_carrier_raised
,
1648 .dtr_rts
= amiga_dtr_rts
,
1652 * The serial driver boot-time initialization code!
1654 static int __init
amiga_serial_probe(struct platform_device
*pdev
)
1656 unsigned long flags
;
1657 struct serial_state
* state
;
1660 serial_driver
= alloc_tty_driver(NR_PORTS
);
1664 show_serial_version();
1666 /* Initialize the tty_driver structure */
1668 serial_driver
->driver_name
= "amiserial";
1669 serial_driver
->name
= "ttyS";
1670 serial_driver
->major
= TTY_MAJOR
;
1671 serial_driver
->minor_start
= 64;
1672 serial_driver
->type
= TTY_DRIVER_TYPE_SERIAL
;
1673 serial_driver
->subtype
= SERIAL_TYPE_NORMAL
;
1674 serial_driver
->init_termios
= tty_std_termios
;
1675 serial_driver
->init_termios
.c_cflag
=
1676 B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
1677 serial_driver
->flags
= TTY_DRIVER_REAL_RAW
;
1678 tty_set_operations(serial_driver
, &serial_ops
);
1681 state
->port
= (int)&custom
.serdatr
; /* Just to give it a value */
1682 state
->custom_divisor
= 0;
1683 state
->icount
.cts
= state
->icount
.dsr
=
1684 state
->icount
.rng
= state
->icount
.dcd
= 0;
1685 state
->icount
.rx
= state
->icount
.tx
= 0;
1686 state
->icount
.frame
= state
->icount
.parity
= 0;
1687 state
->icount
.overrun
= state
->icount
.brk
= 0;
1688 tty_port_init(&state
->tport
);
1689 state
->tport
.ops
= &amiga_port_ops
;
1690 tty_port_link_device(&state
->tport
, serial_driver
, 0);
1692 error
= tty_register_driver(serial_driver
);
1694 goto fail_put_tty_driver
;
1696 printk(KERN_INFO
"ttyS0 is the amiga builtin serial port\n");
1698 /* Hardware set up */
1700 state
->baud_base
= amiga_colorclock
;
1701 state
->xmit_fifo_size
= 1;
1703 /* set ISRs, and then disable the rx interrupts */
1704 error
= request_irq(IRQ_AMIGA_TBE
, ser_tx_int
, 0, "serial TX", state
);
1706 goto fail_unregister
;
1708 error
= request_irq(IRQ_AMIGA_RBF
, ser_rx_int
, 0,
1709 "serial RX", state
);
1713 local_irq_save(flags
);
1715 /* turn off Rx and Tx interrupts */
1716 custom
.intena
= IF_RBF
| IF_TBE
;
1719 /* clear any pending interrupt */
1720 custom
.intreq
= IF_RBF
| IF_TBE
;
1723 local_irq_restore(flags
);
1726 * set the appropriate directions for the modem control flags,
1727 * and clear RTS and DTR
1729 ciab
.ddra
|= (SER_DTR
| SER_RTS
); /* outputs */
1730 ciab
.ddra
&= ~(SER_DCD
| SER_CTS
| SER_DSR
); /* inputs */
1732 platform_set_drvdata(pdev
, state
);
1737 free_irq(IRQ_AMIGA_TBE
, state
);
1739 tty_unregister_driver(serial_driver
);
1740 fail_put_tty_driver
:
1741 tty_port_destroy(&state
->tport
);
1742 put_tty_driver(serial_driver
);
1746 static int __exit
amiga_serial_remove(struct platform_device
*pdev
)
1749 struct serial_state
*state
= platform_get_drvdata(pdev
);
1751 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
1752 error
= tty_unregister_driver(serial_driver
);
1754 printk("SERIAL: failed to unregister serial driver (%d)\n",
1756 put_tty_driver(serial_driver
);
1757 tty_port_destroy(&state
->tport
);
1759 free_irq(IRQ_AMIGA_TBE
, state
);
1760 free_irq(IRQ_AMIGA_RBF
, state
);
1765 static struct platform_driver amiga_serial_driver
= {
1766 .remove
= __exit_p(amiga_serial_remove
),
1768 .name
= "amiga-serial",
1772 module_platform_driver_probe(amiga_serial_driver
, amiga_serial_probe
);
1775 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
1778 * ------------------------------------------------------------
1779 * Serial console driver
1780 * ------------------------------------------------------------
1783 static void amiga_serial_putc(char c
)
1785 custom
.serdat
= (unsigned char)c
| 0x100;
1786 while (!(custom
.serdatr
& 0x2000))
1791 * Print a string to the serial port trying not to disturb
1792 * any possible real use of the port...
1794 * The console must be locked when we get here.
1796 static void serial_console_write(struct console
*co
, const char *s
,
1799 unsigned short intena
= custom
.intenar
;
1801 custom
.intena
= IF_TBE
;
1805 amiga_serial_putc('\r');
1806 amiga_serial_putc(*s
++);
1809 custom
.intena
= IF_SETCLR
| (intena
& IF_TBE
);
1812 static struct tty_driver
*serial_console_device(struct console
*c
, int *index
)
1815 return serial_driver
;
1818 static struct console sercons
= {
1820 .write
= serial_console_write
,
1821 .device
= serial_console_device
,
1822 .flags
= CON_PRINTBUFFER
,
1829 static int __init
amiserial_console_init(void)
1834 register_console(&sercons
);
1837 console_initcall(amiserial_console_init
);
1839 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
1841 MODULE_LICENSE("GPL");
1842 MODULE_ALIAS("platform:amiga-serial");