2 * linux/drivers/char/amiserial.c
4 * Serial driver for the amiga builtin port.
6 * This code was created by taking serial.c version 4.30 from kernel
7 * release 2.3.22, replacing all hardware related stuff with the
8 * corresponding amiga hardware actions, and removing all irrelevant
9 * code. As a consequence, it uses many of the constants and names
10 * associated with the registers and bits of 16550 compatible UARTS -
11 * but only to keep track of status, etc in the state variables. It
12 * was done this was to make it easier to keep the code in line with
13 * (non hardware specific) changes to serial.c.
15 * The port is registered with the tty driver as minor device 64, and
16 * therefore other ports should should only use 65 upwards.
18 * Richard Lucock 28/12/99
20 * Copyright (C) 1991, 1992 Linus Torvalds
21 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
22 * 1998, 1999 Theodore Ts'o
27 * Serial driver configuration section. Here are the various options:
29 * SERIAL_PARANOIA_CHECK
30 * Check the magic number for the async_structure where
34 #include <linux/config.h>
35 #include <linux/delay.h>
37 #undef SERIAL_PARANOIA_CHECK
38 #define SERIAL_DO_RESTART
40 /* Set of debugging defines */
42 #undef SERIAL_DEBUG_INTR
43 #undef SERIAL_DEBUG_OPEN
44 #undef SERIAL_DEBUG_FLOW
45 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
49 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
50 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
51 tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
57 * End of serial driver configuration section.
60 #include <linux/module.h>
62 #include <linux/types.h>
63 #include <linux/serial.h>
64 #include <linux/serialP.h>
65 #include <linux/serial_reg.h>
66 static char *serial_version
= "4.30";
68 #include <linux/errno.h>
69 #include <linux/signal.h>
70 #include <linux/sched.h>
71 #include <linux/kernel.h>
72 #include <linux/timer.h>
73 #include <linux/interrupt.h>
74 #include <linux/tty.h>
75 #include <linux/tty_flip.h>
76 #include <linux/console.h>
77 #include <linux/major.h>
78 #include <linux/string.h>
79 #include <linux/fcntl.h>
80 #include <linux/ptrace.h>
81 #include <linux/ioport.h>
83 #include <linux/slab.h>
84 #include <linux/init.h>
85 #include <linux/bitops.h>
87 #include <asm/setup.h>
89 #include <asm/system.h>
93 #include <asm/amigahw.h>
94 #include <asm/amigaints.h>
96 #define custom amiga_custom
97 static char *serial_name
= "Amiga-builtin serial driver";
99 static struct tty_driver
*serial_driver
;
101 /* number of characters left in xmit buffer before we ask for more */
102 #define WAKEUP_CHARS 256
104 static struct async_struct
*IRQ_ports
;
106 static unsigned char current_ctl_bits
;
108 static void change_speed(struct async_struct
*info
, struct termios
*old
);
109 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
);
112 static struct serial_state rs_table
[1];
114 #define NR_PORTS ARRAY_SIZE(rs_table)
117 * tmp_buf is used as a temporary buffer by serial_write. We need to
118 * lock it in case the copy_from_user blocks while swapping in a page,
119 * and some other program tries to do a serial write at the same time.
120 * Since the lock will only come under contention when the system is
121 * swapping and available memory is low, it makes sense to share one
122 * buffer across all the serial ports, since it significantly saves
123 * memory if large numbers of serial ports are open.
125 static unsigned char *tmp_buf
;
127 #include <asm/uaccess.h>
129 #define serial_isroot() (capable(CAP_SYS_ADMIN))
132 static inline int serial_paranoia_check(struct async_struct
*info
,
133 char *name
, const char *routine
)
135 #ifdef SERIAL_PARANOIA_CHECK
136 static const char *badmagic
=
137 "Warning: bad magic number for serial struct (%s) in %s\n";
138 static const char *badinfo
=
139 "Warning: null async_struct for (%s) in %s\n";
142 printk(badinfo
, name
, routine
);
145 if (info
->magic
!= SERIAL_MAGIC
) {
146 printk(badmagic
, name
, routine
);
153 /* some serial hardware definitions */
154 #define SDR_OVRUN (1<<15)
155 #define SDR_RBF (1<<14)
156 #define SDR_TBE (1<<13)
157 #define SDR_TSRE (1<<12)
159 #define SERPER_PARENB (1<<15)
161 #define AC_SETCLR (1<<15)
162 #define AC_UARTBRK (1<<11)
164 #define SER_DTR (1<<7)
165 #define SER_RTS (1<<6)
166 #define SER_DCD (1<<5)
167 #define SER_CTS (1<<4)
168 #define SER_DSR (1<<3)
170 static __inline__
void rtsdtr_ctrl(int bits
)
172 ciab
.pra
= ((bits
& (SER_RTS
| SER_DTR
)) ^ (SER_RTS
| SER_DTR
)) | (ciab
.pra
& ~(SER_RTS
| SER_DTR
));
176 * ------------------------------------------------------------
177 * rs_stop() and rs_start()
179 * This routines are called before setting or resetting tty->stopped.
180 * They enable or disable transmitter interrupts, as necessary.
181 * ------------------------------------------------------------
183 static void rs_stop(struct tty_struct
*tty
)
185 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
188 if (serial_paranoia_check(info
, tty
->name
, "rs_stop"))
191 local_irq_save(flags
);
192 if (info
->IER
& UART_IER_THRI
) {
193 info
->IER
&= ~UART_IER_THRI
;
194 /* disable Tx interrupt and remove any pending interrupts */
195 custom
.intena
= IF_TBE
;
197 custom
.intreq
= IF_TBE
;
200 local_irq_restore(flags
);
203 static void rs_start(struct tty_struct
*tty
)
205 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
208 if (serial_paranoia_check(info
, tty
->name
, "rs_start"))
211 local_irq_save(flags
);
212 if (info
->xmit
.head
!= info
->xmit
.tail
214 && !(info
->IER
& UART_IER_THRI
)) {
215 info
->IER
|= UART_IER_THRI
;
216 custom
.intena
= IF_SETCLR
| IF_TBE
;
218 /* set a pending Tx Interrupt, transmitter should restart now */
219 custom
.intreq
= IF_SETCLR
| IF_TBE
;
222 local_irq_restore(flags
);
226 * ----------------------------------------------------------------------
228 * Here starts the interrupt handling routines. All of the following
229 * subroutines are declared as inline and are folded into
230 * rs_interrupt(). They were separated out for readability's sake.
232 * Note: rs_interrupt() is a "fast" interrupt, which means that it
233 * runs with interrupts turned off. People who may want to modify
234 * rs_interrupt() should try to keep the interrupt handler as fast as
235 * possible. After you are done making modifications, it is not a bad
238 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
240 * and look at the resulting assemble code in serial.s.
242 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
243 * -----------------------------------------------------------------------
247 * This routine is used by the interrupt handler to schedule
248 * processing in the software interrupt portion of the driver.
250 static void rs_sched_event(struct async_struct
*info
,
253 info
->event
|= 1 << event
;
254 tasklet_schedule(&info
->tlet
);
257 static void receive_chars(struct async_struct
*info
)
261 struct tty_struct
*tty
= info
->tty
;
262 unsigned char ch
, flag
;
263 struct async_icount
*icount
;
266 icount
= &info
->state
->icount
;
268 status
= UART_LSR_DR
; /* We obviously have a character! */
269 serdatr
= custom
.serdatr
;
271 custom
.intreq
= IF_RBF
;
274 if((serdatr
& 0x1ff) == 0)
275 status
|= UART_LSR_BI
;
276 if(serdatr
& SDR_OVRUN
)
277 status
|= UART_LSR_OE
;
282 #ifdef SERIAL_DEBUG_INTR
283 printk("DR%02x:%02x...", ch
, status
);
288 * We don't handle parity or frame errors - but I have left
289 * the code in, since I'm not sure that the errors can't be
293 if (status
& (UART_LSR_BI
| UART_LSR_PE
|
294 UART_LSR_FE
| UART_LSR_OE
)) {
296 * For statistics only
298 if (status
& UART_LSR_BI
) {
299 status
&= ~(UART_LSR_FE
| UART_LSR_PE
);
301 } else if (status
& UART_LSR_PE
)
303 else if (status
& UART_LSR_FE
)
305 if (status
& UART_LSR_OE
)
309 * Now check to see if character should be
310 * ignored, and mask off conditions which
313 if (status
& info
->ignore_status_mask
)
316 status
&= info
->read_status_mask
;
318 if (status
& (UART_LSR_BI
)) {
319 #ifdef SERIAL_DEBUG_INTR
320 printk("handling break....");
323 if (info
->flags
& ASYNC_SAK
)
325 } else if (status
& UART_LSR_PE
)
327 else if (status
& UART_LSR_FE
)
329 if (status
& UART_LSR_OE
) {
331 * Overrun is special, since it's
332 * reported immediately, and doesn't
333 * affect the current character
338 tty_insert_flip_char(tty
, ch
, flag
);
340 tty_insert_flip_char(tty
, 0, TTY_OVERRUN
);
341 tty_flip_buffer_push(tty
);
346 static void transmit_chars(struct async_struct
*info
)
348 custom
.intreq
= IF_TBE
;
351 custom
.serdat
= info
->x_char
| 0x100;
353 info
->state
->icount
.tx
++;
357 if (info
->xmit
.head
== info
->xmit
.tail
358 || info
->tty
->stopped
359 || info
->tty
->hw_stopped
) {
360 info
->IER
&= ~UART_IER_THRI
;
361 custom
.intena
= IF_TBE
;
366 custom
.serdat
= info
->xmit
.buf
[info
->xmit
.tail
++] | 0x100;
368 info
->xmit
.tail
= info
->xmit
.tail
& (SERIAL_XMIT_SIZE
-1);
369 info
->state
->icount
.tx
++;
371 if (CIRC_CNT(info
->xmit
.head
,
373 SERIAL_XMIT_SIZE
) < WAKEUP_CHARS
)
374 rs_sched_event(info
, RS_EVENT_WRITE_WAKEUP
);
376 #ifdef SERIAL_DEBUG_INTR
379 if (info
->xmit
.head
== info
->xmit
.tail
) {
380 custom
.intena
= IF_TBE
;
382 info
->IER
&= ~UART_IER_THRI
;
386 static void check_modem_status(struct async_struct
*info
)
388 unsigned char status
= ciab
.pra
& (SER_DCD
| SER_CTS
| SER_DSR
);
389 unsigned char dstatus
;
390 struct async_icount
*icount
;
392 /* Determine bits that have changed */
393 dstatus
= status
^ current_ctl_bits
;
394 current_ctl_bits
= status
;
397 icount
= &info
->state
->icount
;
398 /* update input line counters */
399 if (dstatus
& SER_DSR
)
401 if (dstatus
& SER_DCD
) {
403 #ifdef CONFIG_HARD_PPS
404 if ((info
->flags
& ASYNC_HARDPPS_CD
) &&
409 if (dstatus
& SER_CTS
)
411 wake_up_interruptible(&info
->delta_msr_wait
);
414 if ((info
->flags
& ASYNC_CHECK_CD
) && (dstatus
& SER_DCD
)) {
415 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
416 printk("ttyS%d CD now %s...", info
->line
,
417 (!(status
& SER_DCD
)) ? "on" : "off");
419 if (!(status
& SER_DCD
))
420 wake_up_interruptible(&info
->open_wait
);
422 #ifdef SERIAL_DEBUG_OPEN
423 printk("doing serial hangup...");
426 tty_hangup(info
->tty
);
429 if (info
->flags
& ASYNC_CTS_FLOW
) {
430 if (info
->tty
->hw_stopped
) {
431 if (!(status
& SER_CTS
)) {
432 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
433 printk("CTS tx start...");
435 info
->tty
->hw_stopped
= 0;
436 info
->IER
|= UART_IER_THRI
;
437 custom
.intena
= IF_SETCLR
| IF_TBE
;
439 /* set a pending Tx Interrupt, transmitter should restart now */
440 custom
.intreq
= IF_SETCLR
| IF_TBE
;
442 rs_sched_event(info
, RS_EVENT_WRITE_WAKEUP
);
446 if ((status
& SER_CTS
)) {
447 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
448 printk("CTS tx stop...");
450 info
->tty
->hw_stopped
= 1;
451 info
->IER
&= ~UART_IER_THRI
;
452 /* disable Tx interrupt and remove any pending interrupts */
453 custom
.intena
= IF_TBE
;
455 custom
.intreq
= IF_TBE
;
462 static irqreturn_t
ser_vbl_int( int irq
, void *data
, struct pt_regs
*regs
)
464 /* vbl is just a periodic interrupt we tie into to update modem status */
465 struct async_struct
* info
= IRQ_ports
;
467 * TBD - is it better to unregister from this interrupt or to
468 * ignore it if MSI is clear ?
470 if(info
->IER
& UART_IER_MSI
)
471 check_modem_status(info
);
475 static irqreturn_t
ser_rx_int(int irq
, void *dev_id
, struct pt_regs
* regs
)
477 struct async_struct
* info
;
479 #ifdef SERIAL_DEBUG_INTR
480 printk("ser_rx_int...");
484 if (!info
|| !info
->tty
)
488 info
->last_active
= jiffies
;
489 #ifdef SERIAL_DEBUG_INTR
495 static irqreturn_t
ser_tx_int(int irq
, void *dev_id
, struct pt_regs
* regs
)
497 struct async_struct
* info
;
499 if (custom
.serdatr
& SDR_TBE
) {
500 #ifdef SERIAL_DEBUG_INTR
501 printk("ser_tx_int...");
505 if (!info
|| !info
->tty
)
508 transmit_chars(info
);
509 info
->last_active
= jiffies
;
510 #ifdef SERIAL_DEBUG_INTR
518 * -------------------------------------------------------------------
519 * Here ends the serial interrupt routines.
520 * -------------------------------------------------------------------
524 * This routine is used to handle the "bottom half" processing for the
525 * serial driver, known also the "software interrupt" processing.
526 * This processing is done at the kernel interrupt level, after the
527 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
528 * is where time-consuming activities which can not be done in the
529 * interrupt driver proper are done; the interrupt driver schedules
530 * them using rs_sched_event(), and they get done here.
533 static void do_softint(unsigned long private_
)
535 struct async_struct
*info
= (struct async_struct
*) private_
;
536 struct tty_struct
*tty
;
542 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP
, &info
->event
)) {
544 wake_up_interruptible(&tty
->write_wait
);
549 * ---------------------------------------------------------------
550 * Low level utility subroutines for the serial driver: routines to
551 * figure out the appropriate timeout for an interrupt chain, routines
552 * to initialize and startup a serial port, and routines to shutdown a
553 * serial port. Useful stuff like that.
554 * ---------------------------------------------------------------
557 static int startup(struct async_struct
* info
)
563 page
= get_zeroed_page(GFP_KERNEL
);
567 local_irq_save(flags
);
569 if (info
->flags
& ASYNC_INITIALIZED
) {
577 info
->xmit
.buf
= (unsigned char *) page
;
579 #ifdef SERIAL_DEBUG_OPEN
580 printk("starting up ttys%d ...", info
->line
);
583 /* Clear anything in the input buffer */
585 custom
.intreq
= IF_RBF
;
588 retval
= request_irq(IRQ_AMIGA_VERTB
, ser_vbl_int
, 0, "serial status", info
);
590 if (serial_isroot()) {
592 set_bit(TTY_IO_ERROR
,
599 /* enable both Rx and Tx interrupts */
600 custom
.intena
= IF_SETCLR
| IF_RBF
| IF_TBE
;
602 info
->IER
= UART_IER_MSI
;
604 /* remember current state of the DCD and CTS bits */
605 current_ctl_bits
= ciab
.pra
& (SER_DCD
| SER_CTS
| SER_DSR
);
610 if (info
->tty
->termios
->c_cflag
& CBAUD
)
611 info
->MCR
= SER_DTR
| SER_RTS
;
612 rtsdtr_ctrl(info
->MCR
);
615 clear_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
616 info
->xmit
.head
= info
->xmit
.tail
= 0;
619 * Set up the tty->alt_speed kludge
622 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_HI
)
623 info
->tty
->alt_speed
= 57600;
624 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_VHI
)
625 info
->tty
->alt_speed
= 115200;
626 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_SHI
)
627 info
->tty
->alt_speed
= 230400;
628 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_WARP
)
629 info
->tty
->alt_speed
= 460800;
633 * and set the speed of the serial port
635 change_speed(info
, NULL
);
637 info
->flags
|= ASYNC_INITIALIZED
;
638 local_irq_restore(flags
);
642 local_irq_restore(flags
);
647 * This routine will shutdown a serial port; interrupts are disabled, and
648 * DTR is dropped if the hangup on close termio flag is on.
650 static void shutdown(struct async_struct
* info
)
653 struct serial_state
*state
;
655 if (!(info
->flags
& ASYNC_INITIALIZED
))
660 #ifdef SERIAL_DEBUG_OPEN
661 printk("Shutting down serial port %d ....\n", info
->line
);
664 local_irq_save(flags
); /* Disable interrupts */
667 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
668 * here so the queue might never be waken up
670 wake_up_interruptible(&info
->delta_msr_wait
);
675 * Free the IRQ, if necessary
677 free_irq(IRQ_AMIGA_VERTB
, info
);
679 if (info
->xmit
.buf
) {
680 free_page((unsigned long) info
->xmit
.buf
);
681 info
->xmit
.buf
= NULL
;
685 custom
.intena
= IF_RBF
| IF_TBE
;
688 /* disable break condition */
689 custom
.adkcon
= AC_UARTBRK
;
692 if (!info
->tty
|| (info
->tty
->termios
->c_cflag
& HUPCL
))
693 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
694 rtsdtr_ctrl(info
->MCR
);
697 set_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
699 info
->flags
&= ~ASYNC_INITIALIZED
;
700 local_irq_restore(flags
);
705 * This routine is called to set the UART divisor registers to match
706 * the specified baud rate for a serial port.
708 static void change_speed(struct async_struct
*info
,
709 struct termios
*old_termios
)
711 int quot
= 0, baud_base
, baud
;
712 unsigned cflag
, cval
= 0;
716 if (!info
->tty
|| !info
->tty
->termios
)
718 cflag
= info
->tty
->termios
->c_cflag
;
720 /* Byte size is always 8 bits plus parity bit if requested */
723 if (cflag
& CSTOPB
) {
727 if (cflag
& PARENB
) {
728 cval
|= UART_LCR_PARITY
;
731 if (!(cflag
& PARODD
))
732 cval
|= UART_LCR_EPAR
;
735 cval
|= UART_LCR_SPAR
;
738 /* Determine divisor based on baud rate */
739 baud
= tty_get_baud_rate(info
->tty
);
741 baud
= 9600; /* B0 transition handled in rs_set_termios */
742 baud_base
= info
->state
->baud_base
;
744 ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
))
745 quot
= info
->state
->custom_divisor
;
748 /* Special case since 134 is really 134.5 */
749 quot
= (2*baud_base
/ 269);
751 quot
= baud_base
/ baud
;
753 /* If the quotient is zero refuse the change */
754 if (!quot
&& old_termios
) {
755 info
->tty
->termios
->c_cflag
&= ~CBAUD
;
756 info
->tty
->termios
->c_cflag
|= (old_termios
->c_cflag
& CBAUD
);
757 baud
= tty_get_baud_rate(info
->tty
);
761 ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
))
762 quot
= info
->state
->custom_divisor
;
765 /* Special case since 134 is really 134.5 */
766 quot
= (2*baud_base
/ 269);
768 quot
= baud_base
/ baud
;
771 /* As a last resort, if the quotient is zero, default to 9600 bps */
773 quot
= baud_base
/ 9600;
775 info
->timeout
= ((info
->xmit_fifo_size
*HZ
*bits
*quot
) / baud_base
);
776 info
->timeout
+= HZ
/50; /* Add .02 seconds of slop */
778 /* CTS flow control flag and modem status interrupts */
779 info
->IER
&= ~UART_IER_MSI
;
780 if (info
->flags
& ASYNC_HARDPPS_CD
)
781 info
->IER
|= UART_IER_MSI
;
782 if (cflag
& CRTSCTS
) {
783 info
->flags
|= ASYNC_CTS_FLOW
;
784 info
->IER
|= UART_IER_MSI
;
786 info
->flags
&= ~ASYNC_CTS_FLOW
;
788 info
->flags
&= ~ASYNC_CHECK_CD
;
790 info
->flags
|= ASYNC_CHECK_CD
;
791 info
->IER
|= UART_IER_MSI
;
794 * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
798 * Set up parity check flag
800 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
802 info
->read_status_mask
= UART_LSR_OE
| UART_LSR_DR
;
803 if (I_INPCK(info
->tty
))
804 info
->read_status_mask
|= UART_LSR_FE
| UART_LSR_PE
;
805 if (I_BRKINT(info
->tty
) || I_PARMRK(info
->tty
))
806 info
->read_status_mask
|= UART_LSR_BI
;
809 * Characters to ignore
811 info
->ignore_status_mask
= 0;
812 if (I_IGNPAR(info
->tty
))
813 info
->ignore_status_mask
|= UART_LSR_PE
| UART_LSR_FE
;
814 if (I_IGNBRK(info
->tty
)) {
815 info
->ignore_status_mask
|= UART_LSR_BI
;
817 * If we're ignore parity and break indicators, ignore
818 * overruns too. (For real raw support).
820 if (I_IGNPAR(info
->tty
))
821 info
->ignore_status_mask
|= UART_LSR_OE
;
824 * !!! ignore all characters if CREAD is not set
826 if ((cflag
& CREAD
) == 0)
827 info
->ignore_status_mask
|= UART_LSR_DR
;
828 local_irq_save(flags
);
833 /* Set up the baud rate */
836 /* Enable or disable parity bit */
838 if(cval
& UART_LCR_PARITY
)
839 serper
|= (SERPER_PARENB
);
841 custom
.serper
= serper
;
845 info
->LCR
= cval
; /* Save LCR */
846 local_irq_restore(flags
);
849 static void rs_put_char(struct tty_struct
*tty
, unsigned char ch
)
851 struct async_struct
*info
;
857 info
= tty
->driver_data
;
859 if (serial_paranoia_check(info
, tty
->name
, "rs_put_char"))
865 local_irq_save(flags
);
866 if (CIRC_SPACE(info
->xmit
.head
,
868 SERIAL_XMIT_SIZE
) == 0) {
869 local_irq_restore(flags
);
873 info
->xmit
.buf
[info
->xmit
.head
++] = ch
;
874 info
->xmit
.head
&= SERIAL_XMIT_SIZE
-1;
875 local_irq_restore(flags
);
878 static void rs_flush_chars(struct tty_struct
*tty
)
880 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
883 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_chars"))
886 if (info
->xmit
.head
== info
->xmit
.tail
892 local_irq_save(flags
);
893 info
->IER
|= UART_IER_THRI
;
894 custom
.intena
= IF_SETCLR
| IF_TBE
;
896 /* set a pending Tx Interrupt, transmitter should restart now */
897 custom
.intreq
= IF_SETCLR
| IF_TBE
;
899 local_irq_restore(flags
);
902 static int rs_write(struct tty_struct
* tty
, const unsigned char *buf
, int count
)
905 struct async_struct
*info
;
911 info
= tty
->driver_data
;
913 if (serial_paranoia_check(info
, tty
->name
, "rs_write"))
916 if (!info
->xmit
.buf
|| !tmp_buf
)
919 local_save_flags(flags
);
922 c
= CIRC_SPACE_TO_END(info
->xmit
.head
,
930 memcpy(info
->xmit
.buf
+ info
->xmit
.head
, buf
, c
);
931 info
->xmit
.head
= ((info
->xmit
.head
+ c
) &
932 (SERIAL_XMIT_SIZE
-1));
937 local_irq_restore(flags
);
939 if (info
->xmit
.head
!= info
->xmit
.tail
942 && !(info
->IER
& UART_IER_THRI
)) {
943 info
->IER
|= UART_IER_THRI
;
945 custom
.intena
= IF_SETCLR
| IF_TBE
;
947 /* set a pending Tx Interrupt, transmitter should restart now */
948 custom
.intreq
= IF_SETCLR
| IF_TBE
;
950 local_irq_restore(flags
);
955 static int rs_write_room(struct tty_struct
*tty
)
957 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
959 if (serial_paranoia_check(info
, tty
->name
, "rs_write_room"))
961 return CIRC_SPACE(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
964 static int rs_chars_in_buffer(struct tty_struct
*tty
)
966 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
968 if (serial_paranoia_check(info
, tty
->name
, "rs_chars_in_buffer"))
970 return CIRC_CNT(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
973 static void rs_flush_buffer(struct tty_struct
*tty
)
975 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
978 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_buffer"))
980 local_irq_save(flags
);
981 info
->xmit
.head
= info
->xmit
.tail
= 0;
982 local_irq_restore(flags
);
983 wake_up_interruptible(&tty
->write_wait
);
988 * This function is used to send a high-priority XON/XOFF character to
991 static void rs_send_xchar(struct tty_struct
*tty
, char ch
)
993 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
996 if (serial_paranoia_check(info
, tty
->name
, "rs_send_char"))
1001 /* Make sure transmit interrupts are on */
1004 local_irq_save(flags
);
1005 if(!(custom
.intenar
& IF_TBE
)) {
1006 custom
.intena
= IF_SETCLR
| IF_TBE
;
1008 /* set a pending Tx Interrupt, transmitter should restart now */
1009 custom
.intreq
= IF_SETCLR
| IF_TBE
;
1012 local_irq_restore(flags
);
1014 info
->IER
|= UART_IER_THRI
;
1019 * ------------------------------------------------------------
1022 * This routine is called by the upper-layer tty layer to signal that
1023 * incoming characters should be throttled.
1024 * ------------------------------------------------------------
1026 static void rs_throttle(struct tty_struct
* tty
)
1028 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
1029 unsigned long flags
;
1030 #ifdef SERIAL_DEBUG_THROTTLE
1033 printk("throttle %s: %d....\n", tty_name(tty
, buf
),
1034 tty
->ldisc
.chars_in_buffer(tty
));
1037 if (serial_paranoia_check(info
, tty
->name
, "rs_throttle"))
1041 rs_send_xchar(tty
, STOP_CHAR(tty
));
1043 if (tty
->termios
->c_cflag
& CRTSCTS
)
1044 info
->MCR
&= ~SER_RTS
;
1046 local_irq_save(flags
);
1047 rtsdtr_ctrl(info
->MCR
);
1048 local_irq_restore(flags
);
1051 static void rs_unthrottle(struct tty_struct
* tty
)
1053 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
1054 unsigned long flags
;
1055 #ifdef SERIAL_DEBUG_THROTTLE
1058 printk("unthrottle %s: %d....\n", tty_name(tty
, buf
),
1059 tty
->ldisc
.chars_in_buffer(tty
));
1062 if (serial_paranoia_check(info
, tty
->name
, "rs_unthrottle"))
1069 rs_send_xchar(tty
, START_CHAR(tty
));
1071 if (tty
->termios
->c_cflag
& CRTSCTS
)
1072 info
->MCR
|= SER_RTS
;
1073 local_irq_save(flags
);
1074 rtsdtr_ctrl(info
->MCR
);
1075 local_irq_restore(flags
);
1079 * ------------------------------------------------------------
1080 * rs_ioctl() and friends
1081 * ------------------------------------------------------------
1084 static int get_serial_info(struct async_struct
* info
,
1085 struct serial_struct __user
* retinfo
)
1087 struct serial_struct tmp
;
1088 struct serial_state
*state
= info
->state
;
1092 memset(&tmp
, 0, sizeof(tmp
));
1093 tmp
.type
= state
->type
;
1094 tmp
.line
= state
->line
;
1095 tmp
.port
= state
->port
;
1096 tmp
.irq
= state
->irq
;
1097 tmp
.flags
= state
->flags
;
1098 tmp
.xmit_fifo_size
= state
->xmit_fifo_size
;
1099 tmp
.baud_base
= state
->baud_base
;
1100 tmp
.close_delay
= state
->close_delay
;
1101 tmp
.closing_wait
= state
->closing_wait
;
1102 tmp
.custom_divisor
= state
->custom_divisor
;
1103 if (copy_to_user(retinfo
,&tmp
,sizeof(*retinfo
)))
1108 static int set_serial_info(struct async_struct
* info
,
1109 struct serial_struct __user
* new_info
)
1111 struct serial_struct new_serial
;
1112 struct serial_state old_state
, *state
;
1113 unsigned int change_irq
,change_port
;
1116 if (copy_from_user(&new_serial
,new_info
,sizeof(new_serial
)))
1118 state
= info
->state
;
1121 change_irq
= new_serial
.irq
!= state
->irq
;
1122 change_port
= (new_serial
.port
!= state
->port
);
1123 if(change_irq
|| change_port
|| (new_serial
.xmit_fifo_size
!= state
->xmit_fifo_size
))
1126 if (!serial_isroot()) {
1127 if ((new_serial
.baud_base
!= state
->baud_base
) ||
1128 (new_serial
.close_delay
!= state
->close_delay
) ||
1129 (new_serial
.xmit_fifo_size
!= state
->xmit_fifo_size
) ||
1130 ((new_serial
.flags
& ~ASYNC_USR_MASK
) !=
1131 (state
->flags
& ~ASYNC_USR_MASK
)))
1133 state
->flags
= ((state
->flags
& ~ASYNC_USR_MASK
) |
1134 (new_serial
.flags
& ASYNC_USR_MASK
));
1135 info
->flags
= ((info
->flags
& ~ASYNC_USR_MASK
) |
1136 (new_serial
.flags
& ASYNC_USR_MASK
));
1137 state
->custom_divisor
= new_serial
.custom_divisor
;
1138 goto check_and_exit
;
1141 if (new_serial
.baud_base
< 9600)
1145 * OK, past this point, all the error checking has been done.
1146 * At this point, we start making changes.....
1149 state
->baud_base
= new_serial
.baud_base
;
1150 state
->flags
= ((state
->flags
& ~ASYNC_FLAGS
) |
1151 (new_serial
.flags
& ASYNC_FLAGS
));
1152 info
->flags
= ((state
->flags
& ~ASYNC_INTERNAL_FLAGS
) |
1153 (info
->flags
& ASYNC_INTERNAL_FLAGS
));
1154 state
->custom_divisor
= new_serial
.custom_divisor
;
1155 state
->close_delay
= new_serial
.close_delay
* HZ
/100;
1156 state
->closing_wait
= new_serial
.closing_wait
* HZ
/100;
1157 info
->tty
->low_latency
= (info
->flags
& ASYNC_LOW_LATENCY
) ? 1 : 0;
1160 if (info
->flags
& ASYNC_INITIALIZED
) {
1161 if (((old_state
.flags
& ASYNC_SPD_MASK
) !=
1162 (state
->flags
& ASYNC_SPD_MASK
)) ||
1163 (old_state
.custom_divisor
!= state
->custom_divisor
)) {
1164 if ((state
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_HI
)
1165 info
->tty
->alt_speed
= 57600;
1166 if ((state
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_VHI
)
1167 info
->tty
->alt_speed
= 115200;
1168 if ((state
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_SHI
)
1169 info
->tty
->alt_speed
= 230400;
1170 if ((state
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_WARP
)
1171 info
->tty
->alt_speed
= 460800;
1172 change_speed(info
, NULL
);
1175 retval
= startup(info
);
1181 * get_lsr_info - get line status register info
1183 * Purpose: Let user call ioctl() to get info when the UART physically
1184 * is emptied. On bus types like RS485, the transmitter must
1185 * release the bus after transmitting. This must be done when
1186 * the transmit shift register is empty, not be done when the
1187 * transmit holding register is empty. This functionality
1188 * allows an RS485 driver to be written in user space.
1190 static int get_lsr_info(struct async_struct
* info
, unsigned int __user
*value
)
1192 unsigned char status
;
1193 unsigned int result
;
1194 unsigned long flags
;
1196 local_irq_save(flags
);
1197 status
= custom
.serdatr
;
1199 local_irq_restore(flags
);
1200 result
= ((status
& SDR_TSRE
) ? TIOCSER_TEMT
: 0);
1201 if (copy_to_user(value
, &result
, sizeof(int)))
1207 static int rs_tiocmget(struct tty_struct
*tty
, struct file
*file
)
1209 struct async_struct
* info
= (struct async_struct
*)tty
->driver_data
;
1210 unsigned char control
, status
;
1211 unsigned long flags
;
1213 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1215 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1218 control
= info
->MCR
;
1219 local_irq_save(flags
);
1221 local_irq_restore(flags
);
1222 return ((control
& SER_RTS
) ? TIOCM_RTS
: 0)
1223 | ((control
& SER_DTR
) ? TIOCM_DTR
: 0)
1224 | (!(status
& SER_DCD
) ? TIOCM_CAR
: 0)
1225 | (!(status
& SER_DSR
) ? TIOCM_DSR
: 0)
1226 | (!(status
& SER_CTS
) ? TIOCM_CTS
: 0);
1229 static int rs_tiocmset(struct tty_struct
*tty
, struct file
*file
,
1230 unsigned int set
, unsigned int clear
)
1232 struct async_struct
* info
= (struct async_struct
*)tty
->driver_data
;
1233 unsigned long flags
;
1235 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1237 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1240 local_irq_save(flags
);
1241 if (set
& TIOCM_RTS
)
1242 info
->MCR
|= SER_RTS
;
1243 if (set
& TIOCM_DTR
)
1244 info
->MCR
|= SER_DTR
;
1245 if (clear
& TIOCM_RTS
)
1246 info
->MCR
&= ~SER_RTS
;
1247 if (clear
& TIOCM_DTR
)
1248 info
->MCR
&= ~SER_DTR
;
1249 rtsdtr_ctrl(info
->MCR
);
1250 local_irq_restore(flags
);
1255 * rs_break() --- routine which turns the break handling on or off
1257 static void rs_break(struct tty_struct
*tty
, int break_state
)
1259 struct async_struct
* info
= (struct async_struct
*)tty
->driver_data
;
1260 unsigned long flags
;
1262 if (serial_paranoia_check(info
, tty
->name
, "rs_break"))
1265 local_irq_save(flags
);
1266 if (break_state
== -1)
1267 custom
.adkcon
= AC_SETCLR
| AC_UARTBRK
;
1269 custom
.adkcon
= AC_UARTBRK
;
1271 local_irq_restore(flags
);
1275 static int rs_ioctl(struct tty_struct
*tty
, struct file
* file
,
1276 unsigned int cmd
, unsigned long arg
)
1278 struct async_struct
* info
= (struct async_struct
*)tty
->driver_data
;
1279 struct async_icount cprev
, cnow
; /* kernel counter temps */
1280 struct serial_icounter_struct icount
;
1281 void __user
*argp
= (void __user
*)arg
;
1282 unsigned long flags
;
1284 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1287 if ((cmd
!= TIOCGSERIAL
) && (cmd
!= TIOCSSERIAL
) &&
1288 (cmd
!= TIOCSERCONFIG
) && (cmd
!= TIOCSERGSTRUCT
) &&
1289 (cmd
!= TIOCMIWAIT
) && (cmd
!= TIOCGICOUNT
)) {
1290 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1296 return get_serial_info(info
, argp
);
1298 return set_serial_info(info
, argp
);
1302 case TIOCSERGETLSR
: /* Get line status register */
1303 return get_lsr_info(info
, argp
);
1305 case TIOCSERGSTRUCT
:
1306 if (copy_to_user(argp
,
1307 info
, sizeof(struct async_struct
)))
1312 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1313 * - mask passed in arg for lines of interest
1314 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1315 * Caller should use TIOCGICOUNT to see which one it was
1318 local_irq_save(flags
);
1319 /* note the counters on entry */
1320 cprev
= info
->state
->icount
;
1321 local_irq_restore(flags
);
1323 interruptible_sleep_on(&info
->delta_msr_wait
);
1324 /* see if a signal did it */
1325 if (signal_pending(current
))
1326 return -ERESTARTSYS
;
1327 local_irq_save(flags
);
1328 cnow
= info
->state
->icount
; /* atomic copy */
1329 local_irq_restore(flags
);
1330 if (cnow
.rng
== cprev
.rng
&& cnow
.dsr
== cprev
.dsr
&&
1331 cnow
.dcd
== cprev
.dcd
&& cnow
.cts
== cprev
.cts
)
1332 return -EIO
; /* no change => error */
1333 if ( ((arg
& TIOCM_RNG
) && (cnow
.rng
!= cprev
.rng
)) ||
1334 ((arg
& TIOCM_DSR
) && (cnow
.dsr
!= cprev
.dsr
)) ||
1335 ((arg
& TIOCM_CD
) && (cnow
.dcd
!= cprev
.dcd
)) ||
1336 ((arg
& TIOCM_CTS
) && (cnow
.cts
!= cprev
.cts
)) ) {
1344 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1345 * Return: write counters to the user passed counter struct
1346 * NB: both 1->0 and 0->1 transitions are counted except for
1347 * RI where only 0->1 is counted.
1350 local_irq_save(flags
);
1351 cnow
= info
->state
->icount
;
1352 local_irq_restore(flags
);
1353 icount
.cts
= cnow
.cts
;
1354 icount
.dsr
= cnow
.dsr
;
1355 icount
.rng
= cnow
.rng
;
1356 icount
.dcd
= cnow
.dcd
;
1357 icount
.rx
= cnow
.rx
;
1358 icount
.tx
= cnow
.tx
;
1359 icount
.frame
= cnow
.frame
;
1360 icount
.overrun
= cnow
.overrun
;
1361 icount
.parity
= cnow
.parity
;
1362 icount
.brk
= cnow
.brk
;
1363 icount
.buf_overrun
= cnow
.buf_overrun
;
1365 if (copy_to_user(argp
, &icount
, sizeof(icount
)))
1370 /* "setserial -W" is called in Debian boot */
1371 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1375 return -ENOIOCTLCMD
;
1380 static void rs_set_termios(struct tty_struct
*tty
, struct termios
*old_termios
)
1382 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
1383 unsigned long flags
;
1384 unsigned int cflag
= tty
->termios
->c_cflag
;
1386 if ( (cflag
== old_termios
->c_cflag
)
1387 && ( RELEVANT_IFLAG(tty
->termios
->c_iflag
)
1388 == RELEVANT_IFLAG(old_termios
->c_iflag
)))
1391 change_speed(info
, old_termios
);
1393 /* Handle transition to B0 status */
1394 if ((old_termios
->c_cflag
& CBAUD
) &&
1396 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
1397 local_irq_save(flags
);
1398 rtsdtr_ctrl(info
->MCR
);
1399 local_irq_restore(flags
);
1402 /* Handle transition away from B0 status */
1403 if (!(old_termios
->c_cflag
& CBAUD
) &&
1405 info
->MCR
|= SER_DTR
;
1406 if (!(tty
->termios
->c_cflag
& CRTSCTS
) ||
1407 !test_bit(TTY_THROTTLED
, &tty
->flags
)) {
1408 info
->MCR
|= SER_RTS
;
1410 local_irq_save(flags
);
1411 rtsdtr_ctrl(info
->MCR
);
1412 local_irq_restore(flags
);
1415 /* Handle turning off CRTSCTS */
1416 if ((old_termios
->c_cflag
& CRTSCTS
) &&
1417 !(tty
->termios
->c_cflag
& CRTSCTS
)) {
1418 tty
->hw_stopped
= 0;
1424 * No need to wake up processes in open wait, since they
1425 * sample the CLOCAL flag once, and don't recheck it.
1426 * XXX It's not clear whether the current behavior is correct
1427 * or not. Hence, this may change.....
1429 if (!(old_termios
->c_cflag
& CLOCAL
) &&
1430 (tty
->termios
->c_cflag
& CLOCAL
))
1431 wake_up_interruptible(&info
->open_wait
);
1436 * ------------------------------------------------------------
1439 * This routine is called when the serial port gets closed. First, we
1440 * wait for the last remaining data to be sent. Then, we unlink its
1441 * async structure from the interrupt chain if necessary, and we free
1442 * that IRQ if nothing is left in the chain.
1443 * ------------------------------------------------------------
1445 static void rs_close(struct tty_struct
*tty
, struct file
* filp
)
1447 struct async_struct
* info
= (struct async_struct
*)tty
->driver_data
;
1448 struct serial_state
*state
;
1449 unsigned long flags
;
1451 if (!info
|| serial_paranoia_check(info
, tty
->name
, "rs_close"))
1454 state
= info
->state
;
1456 local_irq_save(flags
);
1458 if (tty_hung_up_p(filp
)) {
1459 DBG_CNT("before DEC-hung");
1460 local_irq_restore(flags
);
1464 #ifdef SERIAL_DEBUG_OPEN
1465 printk("rs_close ttys%d, count = %d\n", info
->line
, state
->count
);
1467 if ((tty
->count
== 1) && (state
->count
!= 1)) {
1469 * Uh, oh. tty->count is 1, which means that the tty
1470 * structure will be freed. state->count should always
1471 * be one in these conditions. If it's greater than
1472 * one, we've got real problems, since it means the
1473 * serial port won't be shutdown.
1475 printk("rs_close: bad serial port count; tty->count is 1, "
1476 "state->count is %d\n", state
->count
);
1479 if (--state
->count
< 0) {
1480 printk("rs_close: bad serial port count for ttys%d: %d\n",
1481 info
->line
, state
->count
);
1485 DBG_CNT("before DEC-2");
1486 local_irq_restore(flags
);
1489 info
->flags
|= ASYNC_CLOSING
;
1491 * Now we wait for the transmit buffer to clear; and we notify
1492 * the line discipline to only process XON/XOFF characters.
1495 if (info
->closing_wait
!= ASYNC_CLOSING_WAIT_NONE
)
1496 tty_wait_until_sent(tty
, info
->closing_wait
);
1498 * At this point we stop accepting input. To do this, we
1499 * disable the receive line status interrupts, and tell the
1500 * interrupt driver to stop checking the data ready bit in the
1501 * line status register.
1503 info
->read_status_mask
&= ~UART_LSR_DR
;
1504 if (info
->flags
& ASYNC_INITIALIZED
) {
1505 /* disable receive interrupts */
1506 custom
.intena
= IF_RBF
;
1508 /* clear any pending receive interrupt */
1509 custom
.intreq
= IF_RBF
;
1513 * Before we drop DTR, make sure the UART transmitter
1514 * has completely drained; this is especially
1515 * important if there is a transmit FIFO!
1517 rs_wait_until_sent(tty
, info
->timeout
);
1520 if (tty
->driver
->flush_buffer
)
1521 tty
->driver
->flush_buffer(tty
);
1523 tty_ldisc_flush(tty
);
1527 if (info
->blocked_open
) {
1528 if (info
->close_delay
) {
1529 msleep_interruptible(jiffies_to_msecs(info
->close_delay
));
1531 wake_up_interruptible(&info
->open_wait
);
1533 info
->flags
&= ~(ASYNC_NORMAL_ACTIVE
|ASYNC_CLOSING
);
1534 wake_up_interruptible(&info
->close_wait
);
1535 local_irq_restore(flags
);
1539 * rs_wait_until_sent() --- wait until the transmitter is empty
1541 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
)
1543 struct async_struct
* info
= (struct async_struct
*)tty
->driver_data
;
1544 unsigned long orig_jiffies
, char_time
;
1547 if (serial_paranoia_check(info
, tty
->name
, "rs_wait_until_sent"))
1550 if (info
->xmit_fifo_size
== 0)
1551 return; /* Just in case.... */
1553 orig_jiffies
= jiffies
;
1555 * Set the check interval to be 1/5 of the estimated time to
1556 * send a single character, and make it at least 1. The check
1557 * interval should also be less than the timeout.
1559 * Note: we have to use pretty tight timings here to satisfy
1562 char_time
= (info
->timeout
- HZ
/50) / info
->xmit_fifo_size
;
1563 char_time
= char_time
/ 5;
1567 char_time
= min_t(unsigned long, char_time
, timeout
);
1569 * If the transmitter hasn't cleared in twice the approximate
1570 * amount of time to send the entire FIFO, it probably won't
1571 * ever clear. This assumes the UART isn't doing flow
1572 * control, which is currently the case. Hence, if it ever
1573 * takes longer than info->timeout, this is probably due to a
1574 * UART bug of some kind. So, we clamp the timeout parameter at
1577 if (!timeout
|| timeout
> 2*info
->timeout
)
1578 timeout
= 2*info
->timeout
;
1579 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1580 printk("In rs_wait_until_sent(%d) check=%lu...", timeout
, char_time
);
1581 printk("jiff=%lu...", jiffies
);
1583 while(!((lsr
= custom
.serdatr
) & SDR_TSRE
)) {
1584 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1585 printk("serdatr = %d (jiff=%lu)...", lsr
, jiffies
);
1587 msleep_interruptible(jiffies_to_msecs(char_time
));
1588 if (signal_pending(current
))
1590 if (timeout
&& time_after(jiffies
, orig_jiffies
+ timeout
))
1593 current
->state
= TASK_RUNNING
;
1594 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1595 printk("lsr = %d (jiff=%lu)...done\n", lsr
, jiffies
);
1600 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1602 static void rs_hangup(struct tty_struct
*tty
)
1604 struct async_struct
* info
= (struct async_struct
*)tty
->driver_data
;
1605 struct serial_state
*state
= info
->state
;
1607 if (serial_paranoia_check(info
, tty
->name
, "rs_hangup"))
1610 state
= info
->state
;
1612 rs_flush_buffer(tty
);
1616 info
->flags
&= ~ASYNC_NORMAL_ACTIVE
;
1618 wake_up_interruptible(&info
->open_wait
);
1622 * ------------------------------------------------------------
1623 * rs_open() and friends
1624 * ------------------------------------------------------------
1626 static int block_til_ready(struct tty_struct
*tty
, struct file
* filp
,
1627 struct async_struct
*info
)
1629 #ifdef DECLARE_WAITQUEUE
1630 DECLARE_WAITQUEUE(wait
, current
);
1632 struct wait_queue wait
= { current
, NULL
};
1634 struct serial_state
*state
= info
->state
;
1636 int do_clocal
= 0, extra_count
= 0;
1637 unsigned long flags
;
1640 * If the device is in the middle of being closed, then block
1641 * until it's done, and then try again.
1643 if (tty_hung_up_p(filp
) ||
1644 (info
->flags
& ASYNC_CLOSING
)) {
1645 if (info
->flags
& ASYNC_CLOSING
)
1646 interruptible_sleep_on(&info
->close_wait
);
1647 #ifdef SERIAL_DO_RESTART
1648 return ((info
->flags
& ASYNC_HUP_NOTIFY
) ?
1649 -EAGAIN
: -ERESTARTSYS
);
1656 * If non-blocking mode is set, or the port is not enabled,
1657 * then make the check up front and then exit.
1659 if ((filp
->f_flags
& O_NONBLOCK
) ||
1660 (tty
->flags
& (1 << TTY_IO_ERROR
))) {
1661 info
->flags
|= ASYNC_NORMAL_ACTIVE
;
1665 if (tty
->termios
->c_cflag
& CLOCAL
)
1669 * Block waiting for the carrier detect and the line to become
1670 * free (i.e., not in use by the callout). While we are in
1671 * this loop, state->count is dropped by one, so that
1672 * rs_close() knows when to free things. We restore it upon
1673 * exit, either normal or abnormal.
1676 add_wait_queue(&info
->open_wait
, &wait
);
1677 #ifdef SERIAL_DEBUG_OPEN
1678 printk("block_til_ready before block: ttys%d, count = %d\n",
1679 state
->line
, state
->count
);
1681 local_irq_save(flags
);
1682 if (!tty_hung_up_p(filp
)) {
1686 local_irq_restore(flags
);
1687 info
->blocked_open
++;
1689 local_irq_save(flags
);
1690 if (tty
->termios
->c_cflag
& CBAUD
)
1691 rtsdtr_ctrl(SER_DTR
|SER_RTS
);
1692 local_irq_restore(flags
);
1693 set_current_state(TASK_INTERRUPTIBLE
);
1694 if (tty_hung_up_p(filp
) ||
1695 !(info
->flags
& ASYNC_INITIALIZED
)) {
1696 #ifdef SERIAL_DO_RESTART
1697 if (info
->flags
& ASYNC_HUP_NOTIFY
)
1700 retval
= -ERESTARTSYS
;
1706 if (!(info
->flags
& ASYNC_CLOSING
) &&
1707 (do_clocal
|| (!(ciab
.pra
& SER_DCD
)) ))
1709 if (signal_pending(current
)) {
1710 retval
= -ERESTARTSYS
;
1713 #ifdef SERIAL_DEBUG_OPEN
1714 printk("block_til_ready blocking: ttys%d, count = %d\n",
1715 info
->line
, state
->count
);
1719 current
->state
= TASK_RUNNING
;
1720 remove_wait_queue(&info
->open_wait
, &wait
);
1723 info
->blocked_open
--;
1724 #ifdef SERIAL_DEBUG_OPEN
1725 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1726 info
->line
, state
->count
);
1730 info
->flags
|= ASYNC_NORMAL_ACTIVE
;
1734 static int get_async_struct(int line
, struct async_struct
**ret_info
)
1736 struct async_struct
*info
;
1737 struct serial_state
*sstate
;
1739 sstate
= rs_table
+ line
;
1742 *ret_info
= sstate
->info
;
1745 info
= kmalloc(sizeof(struct async_struct
), GFP_KERNEL
);
1750 memset(info
, 0, sizeof(struct async_struct
));
1751 #ifdef DECLARE_WAITQUEUE
1752 init_waitqueue_head(&info
->open_wait
);
1753 init_waitqueue_head(&info
->close_wait
);
1754 init_waitqueue_head(&info
->delta_msr_wait
);
1756 info
->magic
= SERIAL_MAGIC
;
1757 info
->port
= sstate
->port
;
1758 info
->flags
= sstate
->flags
;
1759 info
->xmit_fifo_size
= sstate
->xmit_fifo_size
;
1761 tasklet_init(&info
->tlet
, do_softint
, (unsigned long)info
);
1762 info
->state
= sstate
;
1765 *ret_info
= sstate
->info
;
1768 *ret_info
= sstate
->info
= info
;
1773 * This routine is called whenever a serial port is opened. It
1774 * enables interrupts for a serial port, linking in its async structure into
1775 * the IRQ chain. It also performs the serial-specific
1776 * initialization for the tty structure.
1778 static int rs_open(struct tty_struct
*tty
, struct file
* filp
)
1780 struct async_struct
*info
;
1785 if ((line
< 0) || (line
>= NR_PORTS
)) {
1788 retval
= get_async_struct(line
, &info
);
1792 tty
->driver_data
= info
;
1794 if (serial_paranoia_check(info
, tty
->name
, "rs_open"))
1797 #ifdef SERIAL_DEBUG_OPEN
1798 printk("rs_open %s, count = %d\n", tty
->name
, info
->state
->count
);
1800 info
->tty
->low_latency
= (info
->flags
& ASYNC_LOW_LATENCY
) ? 1 : 0;
1803 page
= get_zeroed_page(GFP_KERNEL
);
1810 tmp_buf
= (unsigned char *) page
;
1814 * If the port is the middle of closing, bail out now
1816 if (tty_hung_up_p(filp
) ||
1817 (info
->flags
& ASYNC_CLOSING
)) {
1818 if (info
->flags
& ASYNC_CLOSING
)
1819 interruptible_sleep_on(&info
->close_wait
);
1820 #ifdef SERIAL_DO_RESTART
1821 return ((info
->flags
& ASYNC_HUP_NOTIFY
) ?
1822 -EAGAIN
: -ERESTARTSYS
);
1829 * Start up serial port
1831 retval
= startup(info
);
1836 retval
= block_til_ready(tty
, filp
, info
);
1838 #ifdef SERIAL_DEBUG_OPEN
1839 printk("rs_open returning after block_til_ready with %d\n",
1845 #ifdef SERIAL_DEBUG_OPEN
1846 printk("rs_open %s successful...", tty
->name
);
1852 * /proc fs routines....
1855 static inline int line_info(char *buf
, struct serial_state
*state
)
1857 struct async_struct
*info
= state
->info
, scr_info
;
1858 char stat_buf
[30], control
, status
;
1860 unsigned long flags
;
1862 ret
= sprintf(buf
, "%d: uart:amiga_builtin",state
->line
);
1865 * Figure out the current RS-232 lines
1868 info
= &scr_info
; /* This is just for serial_{in,out} */
1870 info
->magic
= SERIAL_MAGIC
;
1871 info
->flags
= state
->flags
;
1875 local_irq_save(flags
);
1877 control
= info
? info
->MCR
: status
;
1878 local_irq_restore(flags
);
1882 if(!(control
& SER_RTS
))
1883 strcat(stat_buf
, "|RTS");
1884 if(!(status
& SER_CTS
))
1885 strcat(stat_buf
, "|CTS");
1886 if(!(control
& SER_DTR
))
1887 strcat(stat_buf
, "|DTR");
1888 if(!(status
& SER_DSR
))
1889 strcat(stat_buf
, "|DSR");
1890 if(!(status
& SER_DCD
))
1891 strcat(stat_buf
, "|CD");
1894 ret
+= sprintf(buf
+ret
, " baud:%d",
1895 state
->baud_base
/ info
->quot
);
1898 ret
+= sprintf(buf
+ret
, " tx:%d rx:%d",
1899 state
->icount
.tx
, state
->icount
.rx
);
1901 if (state
->icount
.frame
)
1902 ret
+= sprintf(buf
+ret
, " fe:%d", state
->icount
.frame
);
1904 if (state
->icount
.parity
)
1905 ret
+= sprintf(buf
+ret
, " pe:%d", state
->icount
.parity
);
1907 if (state
->icount
.brk
)
1908 ret
+= sprintf(buf
+ret
, " brk:%d", state
->icount
.brk
);
1910 if (state
->icount
.overrun
)
1911 ret
+= sprintf(buf
+ret
, " oe:%d", state
->icount
.overrun
);
1914 * Last thing is the RS-232 status lines
1916 ret
+= sprintf(buf
+ret
, " %s\n", stat_buf
+1);
1920 static int rs_read_proc(char *page
, char **start
, off_t off
, int count
,
1921 int *eof
, void *data
)
1926 len
+= sprintf(page
, "serinfo:1.0 driver:%s\n", serial_version
);
1927 l
= line_info(page
+ len
, &rs_table
[0]);
1929 if (len
+begin
> off
+count
)
1931 if (len
+begin
< off
) {
1937 if (off
>= len
+begin
)
1939 *start
= page
+ (off
-begin
);
1940 return ((count
< begin
+len
-off
) ? count
: begin
+len
-off
);
1944 * ---------------------------------------------------------------------
1945 * rs_init() and friends
1947 * rs_init() is called at boot-time to initialize the serial driver.
1948 * ---------------------------------------------------------------------
1952 * This routine prints out the appropriate serial driver version
1953 * number, and identifies which options were configured into this
1956 static void show_serial_version(void)
1958 printk(KERN_INFO
"%s version %s\n", serial_name
, serial_version
);
1962 static struct tty_operations serial_ops
= {
1966 .put_char
= rs_put_char
,
1967 .flush_chars
= rs_flush_chars
,
1968 .write_room
= rs_write_room
,
1969 .chars_in_buffer
= rs_chars_in_buffer
,
1970 .flush_buffer
= rs_flush_buffer
,
1972 .throttle
= rs_throttle
,
1973 .unthrottle
= rs_unthrottle
,
1974 .set_termios
= rs_set_termios
,
1977 .hangup
= rs_hangup
,
1978 .break_ctl
= rs_break
,
1979 .send_xchar
= rs_send_xchar
,
1980 .wait_until_sent
= rs_wait_until_sent
,
1981 .read_proc
= rs_read_proc
,
1982 .tiocmget
= rs_tiocmget
,
1983 .tiocmset
= rs_tiocmset
,
1987 * The serial driver boot-time initialization code!
1989 static int __init
rs_init(void)
1991 unsigned long flags
;
1992 struct serial_state
* state
;
1994 if (!MACH_IS_AMIGA
|| !AMIGAHW_PRESENT(AMI_SERIAL
))
1997 serial_driver
= alloc_tty_driver(1);
2002 * We request SERDAT and SERPER only, because the serial registers are
2003 * too spreaded over the custom register space
2005 if (!request_mem_region(CUSTOM_PHYSADDR
+0x30, 4, "amiserial [Paula]"))
2010 show_serial_version();
2012 /* Initialize the tty_driver structure */
2014 serial_driver
->owner
= THIS_MODULE
;
2015 serial_driver
->driver_name
= "amiserial";
2016 serial_driver
->name
= "ttyS";
2017 serial_driver
->major
= TTY_MAJOR
;
2018 serial_driver
->minor_start
= 64;
2019 serial_driver
->type
= TTY_DRIVER_TYPE_SERIAL
;
2020 serial_driver
->subtype
= SERIAL_TYPE_NORMAL
;
2021 serial_driver
->init_termios
= tty_std_termios
;
2022 serial_driver
->init_termios
.c_cflag
=
2023 B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
2024 serial_driver
->flags
= TTY_DRIVER_REAL_RAW
;
2025 tty_set_operations(serial_driver
, &serial_ops
);
2027 if (tty_register_driver(serial_driver
))
2028 panic("Couldn't register serial driver\n");
2031 state
->magic
= SSTATE_MAGIC
;
2032 state
->port
= (int)&custom
.serdatr
; /* Just to give it a value */
2034 state
->custom_divisor
= 0;
2035 state
->close_delay
= 5*HZ
/10;
2036 state
->closing_wait
= 30*HZ
;
2037 state
->icount
.cts
= state
->icount
.dsr
=
2038 state
->icount
.rng
= state
->icount
.dcd
= 0;
2039 state
->icount
.rx
= state
->icount
.tx
= 0;
2040 state
->icount
.frame
= state
->icount
.parity
= 0;
2041 state
->icount
.overrun
= state
->icount
.brk
= 0;
2043 printk(KERN_INFO
"ttyS%d is the amiga builtin serial port\n",
2046 /* Hardware set up */
2048 state
->baud_base
= amiga_colorclock
;
2049 state
->xmit_fifo_size
= 1;
2051 local_irq_save(flags
);
2053 /* set ISRs, and then disable the rx interrupts */
2054 request_irq(IRQ_AMIGA_TBE
, ser_tx_int
, 0, "serial TX", state
);
2055 request_irq(IRQ_AMIGA_RBF
, ser_rx_int
, SA_INTERRUPT
, "serial RX", state
);
2057 /* turn off Rx and Tx interrupts */
2058 custom
.intena
= IF_RBF
| IF_TBE
;
2061 /* clear any pending interrupt */
2062 custom
.intreq
= IF_RBF
| IF_TBE
;
2065 local_irq_restore(flags
);
2068 * set the appropriate directions for the modem control flags,
2069 * and clear RTS and DTR
2071 ciab
.ddra
|= (SER_DTR
| SER_RTS
); /* outputs */
2072 ciab
.ddra
&= ~(SER_DCD
| SER_CTS
| SER_DSR
); /* inputs */
2077 static __exit
void rs_exit(void)
2080 struct async_struct
*info
= rs_table
[0].info
;
2082 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2083 tasklet_kill(&info
->tlet
);
2084 if ((error
= tty_unregister_driver(serial_driver
)))
2085 printk("SERIAL: failed to unregister serial driver (%d)\n",
2087 put_tty_driver(serial_driver
);
2090 rs_table
[0].info
= NULL
;
2095 free_page((unsigned long) tmp_buf
);
2099 release_mem_region(CUSTOM_PHYSADDR
+0x30, 4);
2102 module_init(rs_init
)
2103 module_exit(rs_exit
)
2107 * ------------------------------------------------------------
2108 * Serial console driver
2109 * ------------------------------------------------------------
2111 #ifdef CONFIG_SERIAL_CONSOLE
2113 static void amiga_serial_putc(char c
)
2115 custom
.serdat
= (unsigned char)c
| 0x100;
2116 while (!(custom
.serdatr
& 0x2000))
2121 * Print a string to the serial port trying not to disturb
2122 * any possible real use of the port...
2124 * The console must be locked when we get here.
2126 static void serial_console_write(struct console
*co
, const char *s
,
2129 unsigned short intena
= custom
.intenar
;
2131 custom
.intena
= IF_TBE
;
2135 amiga_serial_putc('\r');
2136 amiga_serial_putc(*s
++);
2139 custom
.intena
= IF_SETCLR
| (intena
& IF_TBE
);
2142 static struct tty_driver
*serial_console_device(struct console
*c
, int *index
)
2145 return serial_driver
;
2148 static struct console sercons
= {
2150 .write
= serial_console_write
,
2151 .device
= serial_console_device
,
2152 .flags
= CON_PRINTBUFFER
,
2159 static int __init
amiserial_console_init(void)
2161 register_console(&sercons
);
2164 console_initcall(amiserial_console_init
);
2167 MODULE_LICENSE("GPL");