2 * Serial driver for the amiga builtin port.
4 * This code was created by taking serial.c version 4.30 from kernel
5 * release 2.3.22, replacing all hardware related stuff with the
6 * corresponding amiga hardware actions, and removing all irrelevant
7 * code. As a consequence, it uses many of the constants and names
8 * associated with the registers and bits of 16550 compatible UARTS -
9 * but only to keep track of status, etc in the state variables. It
10 * was done this was to make it easier to keep the code in line with
11 * (non hardware specific) changes to serial.c.
13 * The port is registered with the tty driver as minor device 64, and
14 * therefore other ports should should only use 65 upwards.
16 * Richard Lucock 28/12/99
18 * Copyright (C) 1991, 1992 Linus Torvalds
19 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
20 * 1998, 1999 Theodore Ts'o
25 * Serial driver configuration section. Here are the various options:
27 * SERIAL_PARANOIA_CHECK
28 * Check the magic number for the async_structure where
32 #include <linux/delay.h>
34 #undef SERIAL_PARANOIA_CHECK
35 #define SERIAL_DO_RESTART
37 /* Set of debugging defines */
39 #undef SERIAL_DEBUG_INTR
40 #undef SERIAL_DEBUG_OPEN
41 #undef SERIAL_DEBUG_FLOW
42 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
46 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
47 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
48 tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
54 * End of serial driver configuration section.
57 #include <linux/module.h>
59 #include <linux/types.h>
60 #include <linux/serial.h>
61 #include <linux/serialP.h>
62 #include <linux/serial_reg.h>
63 static char *serial_version
= "4.30";
65 #include <linux/errno.h>
66 #include <linux/signal.h>
67 #include <linux/sched.h>
68 #include <linux/kernel.h>
69 #include <linux/timer.h>
70 #include <linux/interrupt.h>
71 #include <linux/tty.h>
72 #include <linux/tty_flip.h>
73 #include <linux/console.h>
74 #include <linux/major.h>
75 #include <linux/string.h>
76 #include <linux/fcntl.h>
77 #include <linux/ptrace.h>
78 #include <linux/ioport.h>
80 #include <linux/seq_file.h>
81 #include <linux/slab.h>
82 #include <linux/init.h>
83 #include <linux/bitops.h>
84 #include <linux/platform_device.h>
86 #include <asm/setup.h>
88 #include <asm/system.h>
92 #include <asm/amigahw.h>
93 #include <asm/amigaints.h>
95 #define custom amiga_custom
96 static char *serial_name
= "Amiga-builtin serial driver";
98 static struct tty_driver
*serial_driver
;
100 /* number of characters left in xmit buffer before we ask for more */
101 #define WAKEUP_CHARS 256
103 static struct async_struct
*IRQ_ports
;
105 static unsigned char current_ctl_bits
;
107 static void change_speed(struct async_struct
*info
, struct ktermios
*old
);
108 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
);
111 static struct serial_state rs_table
[1];
113 #define NR_PORTS ARRAY_SIZE(rs_table)
115 #include <asm/uaccess.h>
117 #define serial_isroot() (capable(CAP_SYS_ADMIN))
120 static inline int serial_paranoia_check(struct async_struct
*info
,
121 char *name
, const char *routine
)
123 #ifdef SERIAL_PARANOIA_CHECK
124 static const char *badmagic
=
125 "Warning: bad magic number for serial struct (%s) in %s\n";
126 static const char *badinfo
=
127 "Warning: null async_struct for (%s) in %s\n";
130 printk(badinfo
, name
, routine
);
133 if (info
->magic
!= SERIAL_MAGIC
) {
134 printk(badmagic
, name
, routine
);
141 /* some serial hardware definitions */
142 #define SDR_OVRUN (1<<15)
143 #define SDR_RBF (1<<14)
144 #define SDR_TBE (1<<13)
145 #define SDR_TSRE (1<<12)
147 #define SERPER_PARENB (1<<15)
149 #define AC_SETCLR (1<<15)
150 #define AC_UARTBRK (1<<11)
152 #define SER_DTR (1<<7)
153 #define SER_RTS (1<<6)
154 #define SER_DCD (1<<5)
155 #define SER_CTS (1<<4)
156 #define SER_DSR (1<<3)
158 static __inline__
void rtsdtr_ctrl(int bits
)
160 ciab
.pra
= ((bits
& (SER_RTS
| SER_DTR
)) ^ (SER_RTS
| SER_DTR
)) | (ciab
.pra
& ~(SER_RTS
| SER_DTR
));
164 * ------------------------------------------------------------
165 * rs_stop() and rs_start()
167 * This routines are called before setting or resetting tty->stopped.
168 * They enable or disable transmitter interrupts, as necessary.
169 * ------------------------------------------------------------
171 static void rs_stop(struct tty_struct
*tty
)
173 struct async_struct
*info
= tty
->driver_data
;
176 if (serial_paranoia_check(info
, tty
->name
, "rs_stop"))
179 local_irq_save(flags
);
180 if (info
->IER
& UART_IER_THRI
) {
181 info
->IER
&= ~UART_IER_THRI
;
182 /* disable Tx interrupt and remove any pending interrupts */
183 custom
.intena
= IF_TBE
;
185 custom
.intreq
= IF_TBE
;
188 local_irq_restore(flags
);
191 static void rs_start(struct tty_struct
*tty
)
193 struct async_struct
*info
= tty
->driver_data
;
196 if (serial_paranoia_check(info
, tty
->name
, "rs_start"))
199 local_irq_save(flags
);
200 if (info
->xmit
.head
!= info
->xmit
.tail
202 && !(info
->IER
& UART_IER_THRI
)) {
203 info
->IER
|= UART_IER_THRI
;
204 custom
.intena
= IF_SETCLR
| IF_TBE
;
206 /* set a pending Tx Interrupt, transmitter should restart now */
207 custom
.intreq
= IF_SETCLR
| IF_TBE
;
210 local_irq_restore(flags
);
214 * ----------------------------------------------------------------------
216 * Here starts the interrupt handling routines. All of the following
217 * subroutines are declared as inline and are folded into
218 * rs_interrupt(). They were separated out for readability's sake.
220 * Note: rs_interrupt() is a "fast" interrupt, which means that it
221 * runs with interrupts turned off. People who may want to modify
222 * rs_interrupt() should try to keep the interrupt handler as fast as
223 * possible. After you are done making modifications, it is not a bad
226 * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
228 * and look at the resulting assemble code in serial.s.
230 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
231 * -----------------------------------------------------------------------
235 * This routine is used by the interrupt handler to schedule
236 * processing in the software interrupt portion of the driver.
238 static void rs_sched_event(struct async_struct
*info
,
241 info
->event
|= 1 << event
;
242 tasklet_schedule(&info
->tlet
);
245 static void receive_chars(struct async_struct
*info
)
249 struct tty_struct
*tty
= info
->tty
;
250 unsigned char ch
, flag
;
251 struct async_icount
*icount
;
254 icount
= &info
->state
->icount
;
256 status
= UART_LSR_DR
; /* We obviously have a character! */
257 serdatr
= custom
.serdatr
;
259 custom
.intreq
= IF_RBF
;
262 if((serdatr
& 0x1ff) == 0)
263 status
|= UART_LSR_BI
;
264 if(serdatr
& SDR_OVRUN
)
265 status
|= UART_LSR_OE
;
270 #ifdef SERIAL_DEBUG_INTR
271 printk("DR%02x:%02x...", ch
, status
);
276 * We don't handle parity or frame errors - but I have left
277 * the code in, since I'm not sure that the errors can't be
281 if (status
& (UART_LSR_BI
| UART_LSR_PE
|
282 UART_LSR_FE
| UART_LSR_OE
)) {
284 * For statistics only
286 if (status
& UART_LSR_BI
) {
287 status
&= ~(UART_LSR_FE
| UART_LSR_PE
);
289 } else if (status
& UART_LSR_PE
)
291 else if (status
& UART_LSR_FE
)
293 if (status
& UART_LSR_OE
)
297 * Now check to see if character should be
298 * ignored, and mask off conditions which
301 if (status
& info
->ignore_status_mask
)
304 status
&= info
->read_status_mask
;
306 if (status
& (UART_LSR_BI
)) {
307 #ifdef SERIAL_DEBUG_INTR
308 printk("handling break....");
311 if (info
->flags
& ASYNC_SAK
)
313 } else if (status
& UART_LSR_PE
)
315 else if (status
& UART_LSR_FE
)
317 if (status
& UART_LSR_OE
) {
319 * Overrun is special, since it's
320 * reported immediately, and doesn't
321 * affect the current character
326 tty_insert_flip_char(tty
, ch
, flag
);
328 tty_insert_flip_char(tty
, 0, TTY_OVERRUN
);
329 tty_flip_buffer_push(tty
);
334 static void transmit_chars(struct async_struct
*info
)
336 custom
.intreq
= IF_TBE
;
339 custom
.serdat
= info
->x_char
| 0x100;
341 info
->state
->icount
.tx
++;
345 if (info
->xmit
.head
== info
->xmit
.tail
346 || info
->tty
->stopped
347 || info
->tty
->hw_stopped
) {
348 info
->IER
&= ~UART_IER_THRI
;
349 custom
.intena
= IF_TBE
;
354 custom
.serdat
= info
->xmit
.buf
[info
->xmit
.tail
++] | 0x100;
356 info
->xmit
.tail
= info
->xmit
.tail
& (SERIAL_XMIT_SIZE
-1);
357 info
->state
->icount
.tx
++;
359 if (CIRC_CNT(info
->xmit
.head
,
361 SERIAL_XMIT_SIZE
) < WAKEUP_CHARS
)
362 rs_sched_event(info
, RS_EVENT_WRITE_WAKEUP
);
364 #ifdef SERIAL_DEBUG_INTR
367 if (info
->xmit
.head
== info
->xmit
.tail
) {
368 custom
.intena
= IF_TBE
;
370 info
->IER
&= ~UART_IER_THRI
;
374 static void check_modem_status(struct async_struct
*info
)
376 unsigned char status
= ciab
.pra
& (SER_DCD
| SER_CTS
| SER_DSR
);
377 unsigned char dstatus
;
378 struct async_icount
*icount
;
380 /* Determine bits that have changed */
381 dstatus
= status
^ current_ctl_bits
;
382 current_ctl_bits
= status
;
385 icount
= &info
->state
->icount
;
386 /* update input line counters */
387 if (dstatus
& SER_DSR
)
389 if (dstatus
& SER_DCD
) {
391 #ifdef CONFIG_HARD_PPS
392 if ((info
->flags
& ASYNC_HARDPPS_CD
) &&
397 if (dstatus
& SER_CTS
)
399 wake_up_interruptible(&info
->delta_msr_wait
);
402 if ((info
->flags
& ASYNC_CHECK_CD
) && (dstatus
& SER_DCD
)) {
403 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
404 printk("ttyS%d CD now %s...", info
->line
,
405 (!(status
& SER_DCD
)) ? "on" : "off");
407 if (!(status
& SER_DCD
))
408 wake_up_interruptible(&info
->open_wait
);
410 #ifdef SERIAL_DEBUG_OPEN
411 printk("doing serial hangup...");
414 tty_hangup(info
->tty
);
417 if (info
->flags
& ASYNC_CTS_FLOW
) {
418 if (info
->tty
->hw_stopped
) {
419 if (!(status
& SER_CTS
)) {
420 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
421 printk("CTS tx start...");
423 info
->tty
->hw_stopped
= 0;
424 info
->IER
|= UART_IER_THRI
;
425 custom
.intena
= IF_SETCLR
| IF_TBE
;
427 /* set a pending Tx Interrupt, transmitter should restart now */
428 custom
.intreq
= IF_SETCLR
| IF_TBE
;
430 rs_sched_event(info
, RS_EVENT_WRITE_WAKEUP
);
434 if ((status
& SER_CTS
)) {
435 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
436 printk("CTS tx stop...");
438 info
->tty
->hw_stopped
= 1;
439 info
->IER
&= ~UART_IER_THRI
;
440 /* disable Tx interrupt and remove any pending interrupts */
441 custom
.intena
= IF_TBE
;
443 custom
.intreq
= IF_TBE
;
450 static irqreturn_t
ser_vbl_int( int irq
, void *data
)
452 /* vbl is just a periodic interrupt we tie into to update modem status */
453 struct async_struct
* info
= IRQ_ports
;
455 * TBD - is it better to unregister from this interrupt or to
456 * ignore it if MSI is clear ?
458 if(info
->IER
& UART_IER_MSI
)
459 check_modem_status(info
);
463 static irqreturn_t
ser_rx_int(int irq
, void *dev_id
)
465 struct async_struct
* info
;
467 #ifdef SERIAL_DEBUG_INTR
468 printk("ser_rx_int...");
472 if (!info
|| !info
->tty
)
476 info
->last_active
= jiffies
;
477 #ifdef SERIAL_DEBUG_INTR
483 static irqreturn_t
ser_tx_int(int irq
, void *dev_id
)
485 struct async_struct
* info
;
487 if (custom
.serdatr
& SDR_TBE
) {
488 #ifdef SERIAL_DEBUG_INTR
489 printk("ser_tx_int...");
493 if (!info
|| !info
->tty
)
496 transmit_chars(info
);
497 info
->last_active
= jiffies
;
498 #ifdef SERIAL_DEBUG_INTR
506 * -------------------------------------------------------------------
507 * Here ends the serial interrupt routines.
508 * -------------------------------------------------------------------
512 * This routine is used to handle the "bottom half" processing for the
513 * serial driver, known also the "software interrupt" processing.
514 * This processing is done at the kernel interrupt level, after the
515 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
516 * is where time-consuming activities which can not be done in the
517 * interrupt driver proper are done; the interrupt driver schedules
518 * them using rs_sched_event(), and they get done here.
521 static void do_softint(unsigned long private_
)
523 struct async_struct
*info
= (struct async_struct
*) private_
;
524 struct tty_struct
*tty
;
530 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP
, &info
->event
))
535 * ---------------------------------------------------------------
536 * Low level utility subroutines for the serial driver: routines to
537 * figure out the appropriate timeout for an interrupt chain, routines
538 * to initialize and startup a serial port, and routines to shutdown a
539 * serial port. Useful stuff like that.
540 * ---------------------------------------------------------------
543 static int startup(struct async_struct
* info
)
549 page
= get_zeroed_page(GFP_KERNEL
);
553 local_irq_save(flags
);
555 if (info
->flags
& ASYNC_INITIALIZED
) {
563 info
->xmit
.buf
= (unsigned char *) page
;
565 #ifdef SERIAL_DEBUG_OPEN
566 printk("starting up ttys%d ...", info
->line
);
569 /* Clear anything in the input buffer */
571 custom
.intreq
= IF_RBF
;
574 retval
= request_irq(IRQ_AMIGA_VERTB
, ser_vbl_int
, 0, "serial status", info
);
576 if (serial_isroot()) {
578 set_bit(TTY_IO_ERROR
,
585 /* enable both Rx and Tx interrupts */
586 custom
.intena
= IF_SETCLR
| IF_RBF
| IF_TBE
;
588 info
->IER
= UART_IER_MSI
;
590 /* remember current state of the DCD and CTS bits */
591 current_ctl_bits
= ciab
.pra
& (SER_DCD
| SER_CTS
| SER_DSR
);
596 if (info
->tty
->termios
->c_cflag
& CBAUD
)
597 info
->MCR
= SER_DTR
| SER_RTS
;
598 rtsdtr_ctrl(info
->MCR
);
601 clear_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
602 info
->xmit
.head
= info
->xmit
.tail
= 0;
605 * Set up the tty->alt_speed kludge
608 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_HI
)
609 info
->tty
->alt_speed
= 57600;
610 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_VHI
)
611 info
->tty
->alt_speed
= 115200;
612 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_SHI
)
613 info
->tty
->alt_speed
= 230400;
614 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_WARP
)
615 info
->tty
->alt_speed
= 460800;
619 * and set the speed of the serial port
621 change_speed(info
, NULL
);
623 info
->flags
|= ASYNC_INITIALIZED
;
624 local_irq_restore(flags
);
628 local_irq_restore(flags
);
633 * This routine will shutdown a serial port; interrupts are disabled, and
634 * DTR is dropped if the hangup on close termio flag is on.
636 static void shutdown(struct async_struct
* info
)
639 struct serial_state
*state
;
641 if (!(info
->flags
& ASYNC_INITIALIZED
))
646 #ifdef SERIAL_DEBUG_OPEN
647 printk("Shutting down serial port %d ....\n", info
->line
);
650 local_irq_save(flags
); /* Disable interrupts */
653 * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
654 * here so the queue might never be waken up
656 wake_up_interruptible(&info
->delta_msr_wait
);
661 * Free the IRQ, if necessary
663 free_irq(IRQ_AMIGA_VERTB
, info
);
665 if (info
->xmit
.buf
) {
666 free_page((unsigned long) info
->xmit
.buf
);
667 info
->xmit
.buf
= NULL
;
671 custom
.intena
= IF_RBF
| IF_TBE
;
674 /* disable break condition */
675 custom
.adkcon
= AC_UARTBRK
;
678 if (!info
->tty
|| (info
->tty
->termios
->c_cflag
& HUPCL
))
679 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
680 rtsdtr_ctrl(info
->MCR
);
683 set_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
685 info
->flags
&= ~ASYNC_INITIALIZED
;
686 local_irq_restore(flags
);
691 * This routine is called to set the UART divisor registers to match
692 * the specified baud rate for a serial port.
694 static void change_speed(struct async_struct
*info
,
695 struct ktermios
*old_termios
)
697 int quot
= 0, baud_base
, baud
;
698 unsigned cflag
, cval
= 0;
702 if (!info
->tty
|| !info
->tty
->termios
)
704 cflag
= info
->tty
->termios
->c_cflag
;
706 /* Byte size is always 8 bits plus parity bit if requested */
709 if (cflag
& CSTOPB
) {
713 if (cflag
& PARENB
) {
714 cval
|= UART_LCR_PARITY
;
717 if (!(cflag
& PARODD
))
718 cval
|= UART_LCR_EPAR
;
721 cval
|= UART_LCR_SPAR
;
724 /* Determine divisor based on baud rate */
725 baud
= tty_get_baud_rate(info
->tty
);
727 baud
= 9600; /* B0 transition handled in rs_set_termios */
728 baud_base
= info
->state
->baud_base
;
730 ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
))
731 quot
= info
->state
->custom_divisor
;
734 /* Special case since 134 is really 134.5 */
735 quot
= (2*baud_base
/ 269);
737 quot
= baud_base
/ baud
;
739 /* If the quotient is zero refuse the change */
740 if (!quot
&& old_termios
) {
741 /* FIXME: Will need updating for new tty in the end */
742 info
->tty
->termios
->c_cflag
&= ~CBAUD
;
743 info
->tty
->termios
->c_cflag
|= (old_termios
->c_cflag
& CBAUD
);
744 baud
= tty_get_baud_rate(info
->tty
);
748 ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_CUST
))
749 quot
= info
->state
->custom_divisor
;
752 /* Special case since 134 is really 134.5 */
753 quot
= (2*baud_base
/ 269);
755 quot
= baud_base
/ baud
;
758 /* As a last resort, if the quotient is zero, default to 9600 bps */
760 quot
= baud_base
/ 9600;
762 info
->timeout
= ((info
->xmit_fifo_size
*HZ
*bits
*quot
) / baud_base
);
763 info
->timeout
+= HZ
/50; /* Add .02 seconds of slop */
765 /* CTS flow control flag and modem status interrupts */
766 info
->IER
&= ~UART_IER_MSI
;
767 if (info
->flags
& ASYNC_HARDPPS_CD
)
768 info
->IER
|= UART_IER_MSI
;
769 if (cflag
& CRTSCTS
) {
770 info
->flags
|= ASYNC_CTS_FLOW
;
771 info
->IER
|= UART_IER_MSI
;
773 info
->flags
&= ~ASYNC_CTS_FLOW
;
775 info
->flags
&= ~ASYNC_CHECK_CD
;
777 info
->flags
|= ASYNC_CHECK_CD
;
778 info
->IER
|= UART_IER_MSI
;
781 * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
785 * Set up parity check flag
788 info
->read_status_mask
= UART_LSR_OE
| UART_LSR_DR
;
789 if (I_INPCK(info
->tty
))
790 info
->read_status_mask
|= UART_LSR_FE
| UART_LSR_PE
;
791 if (I_BRKINT(info
->tty
) || I_PARMRK(info
->tty
))
792 info
->read_status_mask
|= UART_LSR_BI
;
795 * Characters to ignore
797 info
->ignore_status_mask
= 0;
798 if (I_IGNPAR(info
->tty
))
799 info
->ignore_status_mask
|= UART_LSR_PE
| UART_LSR_FE
;
800 if (I_IGNBRK(info
->tty
)) {
801 info
->ignore_status_mask
|= UART_LSR_BI
;
803 * If we're ignore parity and break indicators, ignore
804 * overruns too. (For real raw support).
806 if (I_IGNPAR(info
->tty
))
807 info
->ignore_status_mask
|= UART_LSR_OE
;
810 * !!! ignore all characters if CREAD is not set
812 if ((cflag
& CREAD
) == 0)
813 info
->ignore_status_mask
|= UART_LSR_DR
;
814 local_irq_save(flags
);
819 /* Set up the baud rate */
822 /* Enable or disable parity bit */
824 if(cval
& UART_LCR_PARITY
)
825 serper
|= (SERPER_PARENB
);
827 custom
.serper
= serper
;
831 info
->LCR
= cval
; /* Save LCR */
832 local_irq_restore(flags
);
835 static int rs_put_char(struct tty_struct
*tty
, unsigned char ch
)
837 struct async_struct
*info
;
840 info
= tty
->driver_data
;
842 if (serial_paranoia_check(info
, tty
->name
, "rs_put_char"))
848 local_irq_save(flags
);
849 if (CIRC_SPACE(info
->xmit
.head
,
851 SERIAL_XMIT_SIZE
) == 0) {
852 local_irq_restore(flags
);
856 info
->xmit
.buf
[info
->xmit
.head
++] = ch
;
857 info
->xmit
.head
&= SERIAL_XMIT_SIZE
-1;
858 local_irq_restore(flags
);
862 static void rs_flush_chars(struct tty_struct
*tty
)
864 struct async_struct
*info
= tty
->driver_data
;
867 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_chars"))
870 if (info
->xmit
.head
== info
->xmit
.tail
876 local_irq_save(flags
);
877 info
->IER
|= UART_IER_THRI
;
878 custom
.intena
= IF_SETCLR
| IF_TBE
;
880 /* set a pending Tx Interrupt, transmitter should restart now */
881 custom
.intreq
= IF_SETCLR
| IF_TBE
;
883 local_irq_restore(flags
);
886 static int rs_write(struct tty_struct
* tty
, const unsigned char *buf
, int count
)
889 struct async_struct
*info
;
892 info
= tty
->driver_data
;
894 if (serial_paranoia_check(info
, tty
->name
, "rs_write"))
900 local_irq_save(flags
);
902 c
= CIRC_SPACE_TO_END(info
->xmit
.head
,
910 memcpy(info
->xmit
.buf
+ info
->xmit
.head
, buf
, c
);
911 info
->xmit
.head
= ((info
->xmit
.head
+ c
) &
912 (SERIAL_XMIT_SIZE
-1));
917 local_irq_restore(flags
);
919 if (info
->xmit
.head
!= info
->xmit
.tail
922 && !(info
->IER
& UART_IER_THRI
)) {
923 info
->IER
|= UART_IER_THRI
;
925 custom
.intena
= IF_SETCLR
| IF_TBE
;
927 /* set a pending Tx Interrupt, transmitter should restart now */
928 custom
.intreq
= IF_SETCLR
| IF_TBE
;
930 local_irq_restore(flags
);
935 static int rs_write_room(struct tty_struct
*tty
)
937 struct async_struct
*info
= tty
->driver_data
;
939 if (serial_paranoia_check(info
, tty
->name
, "rs_write_room"))
941 return CIRC_SPACE(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
944 static int rs_chars_in_buffer(struct tty_struct
*tty
)
946 struct async_struct
*info
= tty
->driver_data
;
948 if (serial_paranoia_check(info
, tty
->name
, "rs_chars_in_buffer"))
950 return CIRC_CNT(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
953 static void rs_flush_buffer(struct tty_struct
*tty
)
955 struct async_struct
*info
= tty
->driver_data
;
958 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_buffer"))
960 local_irq_save(flags
);
961 info
->xmit
.head
= info
->xmit
.tail
= 0;
962 local_irq_restore(flags
);
967 * This function is used to send a high-priority XON/XOFF character to
970 static void rs_send_xchar(struct tty_struct
*tty
, char ch
)
972 struct async_struct
*info
= tty
->driver_data
;
975 if (serial_paranoia_check(info
, tty
->name
, "rs_send_char"))
980 /* Make sure transmit interrupts are on */
983 local_irq_save(flags
);
984 if(!(custom
.intenar
& IF_TBE
)) {
985 custom
.intena
= IF_SETCLR
| IF_TBE
;
987 /* set a pending Tx Interrupt, transmitter should restart now */
988 custom
.intreq
= IF_SETCLR
| IF_TBE
;
991 local_irq_restore(flags
);
993 info
->IER
|= UART_IER_THRI
;
998 * ------------------------------------------------------------
1001 * This routine is called by the upper-layer tty layer to signal that
1002 * incoming characters should be throttled.
1003 * ------------------------------------------------------------
1005 static void rs_throttle(struct tty_struct
* tty
)
1007 struct async_struct
*info
= tty
->driver_data
;
1008 unsigned long flags
;
1009 #ifdef SERIAL_DEBUG_THROTTLE
1012 printk("throttle %s: %d....\n", tty_name(tty
, buf
),
1013 tty
->ldisc
.chars_in_buffer(tty
));
1016 if (serial_paranoia_check(info
, tty
->name
, "rs_throttle"))
1020 rs_send_xchar(tty
, STOP_CHAR(tty
));
1022 if (tty
->termios
->c_cflag
& CRTSCTS
)
1023 info
->MCR
&= ~SER_RTS
;
1025 local_irq_save(flags
);
1026 rtsdtr_ctrl(info
->MCR
);
1027 local_irq_restore(flags
);
1030 static void rs_unthrottle(struct tty_struct
* tty
)
1032 struct async_struct
*info
= tty
->driver_data
;
1033 unsigned long flags
;
1034 #ifdef SERIAL_DEBUG_THROTTLE
1037 printk("unthrottle %s: %d....\n", tty_name(tty
, buf
),
1038 tty
->ldisc
.chars_in_buffer(tty
));
1041 if (serial_paranoia_check(info
, tty
->name
, "rs_unthrottle"))
1048 rs_send_xchar(tty
, START_CHAR(tty
));
1050 if (tty
->termios
->c_cflag
& CRTSCTS
)
1051 info
->MCR
|= SER_RTS
;
1052 local_irq_save(flags
);
1053 rtsdtr_ctrl(info
->MCR
);
1054 local_irq_restore(flags
);
1058 * ------------------------------------------------------------
1059 * rs_ioctl() and friends
1060 * ------------------------------------------------------------
1063 static int get_serial_info(struct async_struct
* info
,
1064 struct serial_struct __user
* retinfo
)
1066 struct serial_struct tmp
;
1067 struct serial_state
*state
= info
->state
;
1071 memset(&tmp
, 0, sizeof(tmp
));
1073 tmp
.type
= state
->type
;
1074 tmp
.line
= state
->line
;
1075 tmp
.port
= state
->port
;
1076 tmp
.irq
= state
->irq
;
1077 tmp
.flags
= state
->flags
;
1078 tmp
.xmit_fifo_size
= state
->xmit_fifo_size
;
1079 tmp
.baud_base
= state
->baud_base
;
1080 tmp
.close_delay
= state
->close_delay
;
1081 tmp
.closing_wait
= state
->closing_wait
;
1082 tmp
.custom_divisor
= state
->custom_divisor
;
1084 if (copy_to_user(retinfo
,&tmp
,sizeof(*retinfo
)))
1089 static int set_serial_info(struct async_struct
* info
,
1090 struct serial_struct __user
* new_info
)
1092 struct serial_struct new_serial
;
1093 struct serial_state old_state
, *state
;
1094 unsigned int change_irq
,change_port
;
1097 if (copy_from_user(&new_serial
,new_info
,sizeof(new_serial
)))
1101 state
= info
->state
;
1104 change_irq
= new_serial
.irq
!= state
->irq
;
1105 change_port
= (new_serial
.port
!= state
->port
);
1106 if(change_irq
|| change_port
|| (new_serial
.xmit_fifo_size
!= state
->xmit_fifo_size
)) {
1111 if (!serial_isroot()) {
1112 if ((new_serial
.baud_base
!= state
->baud_base
) ||
1113 (new_serial
.close_delay
!= state
->close_delay
) ||
1114 (new_serial
.xmit_fifo_size
!= state
->xmit_fifo_size
) ||
1115 ((new_serial
.flags
& ~ASYNC_USR_MASK
) !=
1116 (state
->flags
& ~ASYNC_USR_MASK
)))
1118 state
->flags
= ((state
->flags
& ~ASYNC_USR_MASK
) |
1119 (new_serial
.flags
& ASYNC_USR_MASK
));
1120 info
->flags
= ((info
->flags
& ~ASYNC_USR_MASK
) |
1121 (new_serial
.flags
& ASYNC_USR_MASK
));
1122 state
->custom_divisor
= new_serial
.custom_divisor
;
1123 goto check_and_exit
;
1126 if (new_serial
.baud_base
< 9600) {
1132 * OK, past this point, all the error checking has been done.
1133 * At this point, we start making changes.....
1136 state
->baud_base
= new_serial
.baud_base
;
1137 state
->flags
= ((state
->flags
& ~ASYNC_FLAGS
) |
1138 (new_serial
.flags
& ASYNC_FLAGS
));
1139 info
->flags
= ((state
->flags
& ~ASYNC_INTERNAL_FLAGS
) |
1140 (info
->flags
& ASYNC_INTERNAL_FLAGS
));
1141 state
->custom_divisor
= new_serial
.custom_divisor
;
1142 state
->close_delay
= new_serial
.close_delay
* HZ
/100;
1143 state
->closing_wait
= new_serial
.closing_wait
* HZ
/100;
1144 info
->tty
->low_latency
= (info
->flags
& ASYNC_LOW_LATENCY
) ? 1 : 0;
1147 if (info
->flags
& ASYNC_INITIALIZED
) {
1148 if (((old_state
.flags
& ASYNC_SPD_MASK
) !=
1149 (state
->flags
& ASYNC_SPD_MASK
)) ||
1150 (old_state
.custom_divisor
!= state
->custom_divisor
)) {
1151 if ((state
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_HI
)
1152 info
->tty
->alt_speed
= 57600;
1153 if ((state
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_VHI
)
1154 info
->tty
->alt_speed
= 115200;
1155 if ((state
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_SHI
)
1156 info
->tty
->alt_speed
= 230400;
1157 if ((state
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_WARP
)
1158 info
->tty
->alt_speed
= 460800;
1159 change_speed(info
, NULL
);
1162 retval
= startup(info
);
1169 * get_lsr_info - get line status register info
1171 * Purpose: Let user call ioctl() to get info when the UART physically
1172 * is emptied. On bus types like RS485, the transmitter must
1173 * release the bus after transmitting. This must be done when
1174 * the transmit shift register is empty, not be done when the
1175 * transmit holding register is empty. This functionality
1176 * allows an RS485 driver to be written in user space.
1178 static int get_lsr_info(struct async_struct
* info
, unsigned int __user
*value
)
1180 unsigned char status
;
1181 unsigned int result
;
1182 unsigned long flags
;
1184 local_irq_save(flags
);
1185 status
= custom
.serdatr
;
1187 local_irq_restore(flags
);
1188 result
= ((status
& SDR_TSRE
) ? TIOCSER_TEMT
: 0);
1189 if (copy_to_user(value
, &result
, sizeof(int)))
1195 static int rs_tiocmget(struct tty_struct
*tty
)
1197 struct async_struct
* info
= tty
->driver_data
;
1198 unsigned char control
, status
;
1199 unsigned long flags
;
1201 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1203 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1206 control
= info
->MCR
;
1207 local_irq_save(flags
);
1209 local_irq_restore(flags
);
1210 return ((control
& SER_RTS
) ? TIOCM_RTS
: 0)
1211 | ((control
& SER_DTR
) ? TIOCM_DTR
: 0)
1212 | (!(status
& SER_DCD
) ? TIOCM_CAR
: 0)
1213 | (!(status
& SER_DSR
) ? TIOCM_DSR
: 0)
1214 | (!(status
& SER_CTS
) ? TIOCM_CTS
: 0);
1217 static int rs_tiocmset(struct tty_struct
*tty
, unsigned int set
,
1220 struct async_struct
* info
= tty
->driver_data
;
1221 unsigned long flags
;
1223 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1225 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1228 local_irq_save(flags
);
1229 if (set
& TIOCM_RTS
)
1230 info
->MCR
|= SER_RTS
;
1231 if (set
& TIOCM_DTR
)
1232 info
->MCR
|= SER_DTR
;
1233 if (clear
& TIOCM_RTS
)
1234 info
->MCR
&= ~SER_RTS
;
1235 if (clear
& TIOCM_DTR
)
1236 info
->MCR
&= ~SER_DTR
;
1237 rtsdtr_ctrl(info
->MCR
);
1238 local_irq_restore(flags
);
1243 * rs_break() --- routine which turns the break handling on or off
1245 static int rs_break(struct tty_struct
*tty
, int break_state
)
1247 struct async_struct
* info
= tty
->driver_data
;
1248 unsigned long flags
;
1250 if (serial_paranoia_check(info
, tty
->name
, "rs_break"))
1253 local_irq_save(flags
);
1254 if (break_state
== -1)
1255 custom
.adkcon
= AC_SETCLR
| AC_UARTBRK
;
1257 custom
.adkcon
= AC_UARTBRK
;
1259 local_irq_restore(flags
);
1264 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1265 * Return: write counters to the user passed counter struct
1266 * NB: both 1->0 and 0->1 transitions are counted except for
1267 * RI where only 0->1 is counted.
1269 static int rs_get_icount(struct tty_struct
*tty
,
1270 struct serial_icounter_struct
*icount
)
1272 struct async_struct
*info
= tty
->driver_data
;
1273 struct async_icount cnow
;
1274 unsigned long flags
;
1276 local_irq_save(flags
);
1277 cnow
= info
->state
->icount
;
1278 local_irq_restore(flags
);
1279 icount
->cts
= cnow
.cts
;
1280 icount
->dsr
= cnow
.dsr
;
1281 icount
->rng
= cnow
.rng
;
1282 icount
->dcd
= cnow
.dcd
;
1283 icount
->rx
= cnow
.rx
;
1284 icount
->tx
= cnow
.tx
;
1285 icount
->frame
= cnow
.frame
;
1286 icount
->overrun
= cnow
.overrun
;
1287 icount
->parity
= cnow
.parity
;
1288 icount
->brk
= cnow
.brk
;
1289 icount
->buf_overrun
= cnow
.buf_overrun
;
1294 static int rs_ioctl(struct tty_struct
*tty
,
1295 unsigned int cmd
, unsigned long arg
)
1297 struct async_struct
* info
= tty
->driver_data
;
1298 struct async_icount cprev
, cnow
; /* kernel counter temps */
1299 void __user
*argp
= (void __user
*)arg
;
1300 unsigned long flags
;
1302 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1305 if ((cmd
!= TIOCGSERIAL
) && (cmd
!= TIOCSSERIAL
) &&
1306 (cmd
!= TIOCSERCONFIG
) && (cmd
!= TIOCSERGSTRUCT
) &&
1307 (cmd
!= TIOCMIWAIT
) && (cmd
!= TIOCGICOUNT
)) {
1308 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1314 return get_serial_info(info
, argp
);
1316 return set_serial_info(info
, argp
);
1320 case TIOCSERGETLSR
: /* Get line status register */
1321 return get_lsr_info(info
, argp
);
1323 case TIOCSERGSTRUCT
:
1324 if (copy_to_user(argp
,
1325 info
, sizeof(struct async_struct
)))
1330 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1331 * - mask passed in arg for lines of interest
1332 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1333 * Caller should use TIOCGICOUNT to see which one it was
1336 local_irq_save(flags
);
1337 /* note the counters on entry */
1338 cprev
= info
->state
->icount
;
1339 local_irq_restore(flags
);
1341 interruptible_sleep_on(&info
->delta_msr_wait
);
1342 /* see if a signal did it */
1343 if (signal_pending(current
))
1344 return -ERESTARTSYS
;
1345 local_irq_save(flags
);
1346 cnow
= info
->state
->icount
; /* atomic copy */
1347 local_irq_restore(flags
);
1348 if (cnow
.rng
== cprev
.rng
&& cnow
.dsr
== cprev
.dsr
&&
1349 cnow
.dcd
== cprev
.dcd
&& cnow
.cts
== cprev
.cts
)
1350 return -EIO
; /* no change => error */
1351 if ( ((arg
& TIOCM_RNG
) && (cnow
.rng
!= cprev
.rng
)) ||
1352 ((arg
& TIOCM_DSR
) && (cnow
.dsr
!= cprev
.dsr
)) ||
1353 ((arg
& TIOCM_CD
) && (cnow
.dcd
!= cprev
.dcd
)) ||
1354 ((arg
& TIOCM_CTS
) && (cnow
.cts
!= cprev
.cts
)) ) {
1363 /* "setserial -W" is called in Debian boot */
1364 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1368 return -ENOIOCTLCMD
;
1373 static void rs_set_termios(struct tty_struct
*tty
, struct ktermios
*old_termios
)
1375 struct async_struct
*info
= tty
->driver_data
;
1376 unsigned long flags
;
1377 unsigned int cflag
= tty
->termios
->c_cflag
;
1379 change_speed(info
, old_termios
);
1381 /* Handle transition to B0 status */
1382 if ((old_termios
->c_cflag
& CBAUD
) &&
1384 info
->MCR
&= ~(SER_DTR
|SER_RTS
);
1385 local_irq_save(flags
);
1386 rtsdtr_ctrl(info
->MCR
);
1387 local_irq_restore(flags
);
1390 /* Handle transition away from B0 status */
1391 if (!(old_termios
->c_cflag
& CBAUD
) &&
1393 info
->MCR
|= SER_DTR
;
1394 if (!(tty
->termios
->c_cflag
& CRTSCTS
) ||
1395 !test_bit(TTY_THROTTLED
, &tty
->flags
)) {
1396 info
->MCR
|= SER_RTS
;
1398 local_irq_save(flags
);
1399 rtsdtr_ctrl(info
->MCR
);
1400 local_irq_restore(flags
);
1403 /* Handle turning off CRTSCTS */
1404 if ((old_termios
->c_cflag
& CRTSCTS
) &&
1405 !(tty
->termios
->c_cflag
& CRTSCTS
)) {
1406 tty
->hw_stopped
= 0;
1412 * No need to wake up processes in open wait, since they
1413 * sample the CLOCAL flag once, and don't recheck it.
1414 * XXX It's not clear whether the current behavior is correct
1415 * or not. Hence, this may change.....
1417 if (!(old_termios
->c_cflag
& CLOCAL
) &&
1418 (tty
->termios
->c_cflag
& CLOCAL
))
1419 wake_up_interruptible(&info
->open_wait
);
1424 * ------------------------------------------------------------
1427 * This routine is called when the serial port gets closed. First, we
1428 * wait for the last remaining data to be sent. Then, we unlink its
1429 * async structure from the interrupt chain if necessary, and we free
1430 * that IRQ if nothing is left in the chain.
1431 * ------------------------------------------------------------
1433 static void rs_close(struct tty_struct
*tty
, struct file
* filp
)
1435 struct async_struct
* info
= tty
->driver_data
;
1436 struct serial_state
*state
;
1437 unsigned long flags
;
1439 if (!info
|| serial_paranoia_check(info
, tty
->name
, "rs_close"))
1442 state
= info
->state
;
1444 local_irq_save(flags
);
1446 if (tty_hung_up_p(filp
)) {
1447 DBG_CNT("before DEC-hung");
1448 local_irq_restore(flags
);
1452 #ifdef SERIAL_DEBUG_OPEN
1453 printk("rs_close ttys%d, count = %d\n", info
->line
, state
->count
);
1455 if ((tty
->count
== 1) && (state
->count
!= 1)) {
1457 * Uh, oh. tty->count is 1, which means that the tty
1458 * structure will be freed. state->count should always
1459 * be one in these conditions. If it's greater than
1460 * one, we've got real problems, since it means the
1461 * serial port won't be shutdown.
1463 printk("rs_close: bad serial port count; tty->count is 1, "
1464 "state->count is %d\n", state
->count
);
1467 if (--state
->count
< 0) {
1468 printk("rs_close: bad serial port count for ttys%d: %d\n",
1469 info
->line
, state
->count
);
1473 DBG_CNT("before DEC-2");
1474 local_irq_restore(flags
);
1477 info
->flags
|= ASYNC_CLOSING
;
1479 * Now we wait for the transmit buffer to clear; and we notify
1480 * the line discipline to only process XON/XOFF characters.
1483 if (info
->closing_wait
!= ASYNC_CLOSING_WAIT_NONE
)
1484 tty_wait_until_sent(tty
, info
->closing_wait
);
1486 * At this point we stop accepting input. To do this, we
1487 * disable the receive line status interrupts, and tell the
1488 * interrupt driver to stop checking the data ready bit in the
1489 * line status register.
1491 info
->read_status_mask
&= ~UART_LSR_DR
;
1492 if (info
->flags
& ASYNC_INITIALIZED
) {
1493 /* disable receive interrupts */
1494 custom
.intena
= IF_RBF
;
1496 /* clear any pending receive interrupt */
1497 custom
.intreq
= IF_RBF
;
1501 * Before we drop DTR, make sure the UART transmitter
1502 * has completely drained; this is especially
1503 * important if there is a transmit FIFO!
1505 rs_wait_until_sent(tty
, info
->timeout
);
1508 rs_flush_buffer(tty
);
1510 tty_ldisc_flush(tty
);
1514 if (info
->blocked_open
) {
1515 if (info
->close_delay
) {
1516 msleep_interruptible(jiffies_to_msecs(info
->close_delay
));
1518 wake_up_interruptible(&info
->open_wait
);
1520 info
->flags
&= ~(ASYNC_NORMAL_ACTIVE
|ASYNC_CLOSING
);
1521 wake_up_interruptible(&info
->close_wait
);
1522 local_irq_restore(flags
);
1526 * rs_wait_until_sent() --- wait until the transmitter is empty
1528 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
)
1530 struct async_struct
* info
= tty
->driver_data
;
1531 unsigned long orig_jiffies
, char_time
;
1534 if (serial_paranoia_check(info
, tty
->name
, "rs_wait_until_sent"))
1537 if (info
->xmit_fifo_size
== 0)
1538 return; /* Just in case.... */
1540 orig_jiffies
= jiffies
;
1543 * Set the check interval to be 1/5 of the estimated time to
1544 * send a single character, and make it at least 1. The check
1545 * interval should also be less than the timeout.
1547 * Note: we have to use pretty tight timings here to satisfy
1550 char_time
= (info
->timeout
- HZ
/50) / info
->xmit_fifo_size
;
1551 char_time
= char_time
/ 5;
1555 char_time
= min_t(unsigned long, char_time
, timeout
);
1557 * If the transmitter hasn't cleared in twice the approximate
1558 * amount of time to send the entire FIFO, it probably won't
1559 * ever clear. This assumes the UART isn't doing flow
1560 * control, which is currently the case. Hence, if it ever
1561 * takes longer than info->timeout, this is probably due to a
1562 * UART bug of some kind. So, we clamp the timeout parameter at
1565 if (!timeout
|| timeout
> 2*info
->timeout
)
1566 timeout
= 2*info
->timeout
;
1567 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1568 printk("In rs_wait_until_sent(%d) check=%lu...", timeout
, char_time
);
1569 printk("jiff=%lu...", jiffies
);
1571 while(!((lsr
= custom
.serdatr
) & SDR_TSRE
)) {
1572 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1573 printk("serdatr = %d (jiff=%lu)...", lsr
, jiffies
);
1575 msleep_interruptible(jiffies_to_msecs(char_time
));
1576 if (signal_pending(current
))
1578 if (timeout
&& time_after(jiffies
, orig_jiffies
+ timeout
))
1581 __set_current_state(TASK_RUNNING
);
1583 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1584 printk("lsr = %d (jiff=%lu)...done\n", lsr
, jiffies
);
1589 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1591 static void rs_hangup(struct tty_struct
*tty
)
1593 struct async_struct
* info
= tty
->driver_data
;
1594 struct serial_state
*state
= info
->state
;
1596 if (serial_paranoia_check(info
, tty
->name
, "rs_hangup"))
1599 state
= info
->state
;
1601 rs_flush_buffer(tty
);
1605 info
->flags
&= ~ASYNC_NORMAL_ACTIVE
;
1607 wake_up_interruptible(&info
->open_wait
);
1611 * ------------------------------------------------------------
1612 * rs_open() and friends
1613 * ------------------------------------------------------------
1615 static int block_til_ready(struct tty_struct
*tty
, struct file
* filp
,
1616 struct async_struct
*info
)
1618 #ifdef DECLARE_WAITQUEUE
1619 DECLARE_WAITQUEUE(wait
, current
);
1621 struct wait_queue wait
= { current
, NULL
};
1623 struct serial_state
*state
= info
->state
;
1625 int do_clocal
= 0, extra_count
= 0;
1626 unsigned long flags
;
1629 * If the device is in the middle of being closed, then block
1630 * until it's done, and then try again.
1632 if (tty_hung_up_p(filp
) ||
1633 (info
->flags
& ASYNC_CLOSING
)) {
1634 if (info
->flags
& ASYNC_CLOSING
)
1635 interruptible_sleep_on(&info
->close_wait
);
1636 #ifdef SERIAL_DO_RESTART
1637 return ((info
->flags
& ASYNC_HUP_NOTIFY
) ?
1638 -EAGAIN
: -ERESTARTSYS
);
1645 * If non-blocking mode is set, or the port is not enabled,
1646 * then make the check up front and then exit.
1648 if ((filp
->f_flags
& O_NONBLOCK
) ||
1649 (tty
->flags
& (1 << TTY_IO_ERROR
))) {
1650 info
->flags
|= ASYNC_NORMAL_ACTIVE
;
1654 if (tty
->termios
->c_cflag
& CLOCAL
)
1658 * Block waiting for the carrier detect and the line to become
1659 * free (i.e., not in use by the callout). While we are in
1660 * this loop, state->count is dropped by one, so that
1661 * rs_close() knows when to free things. We restore it upon
1662 * exit, either normal or abnormal.
1665 add_wait_queue(&info
->open_wait
, &wait
);
1666 #ifdef SERIAL_DEBUG_OPEN
1667 printk("block_til_ready before block: ttys%d, count = %d\n",
1668 state
->line
, state
->count
);
1670 local_irq_save(flags
);
1671 if (!tty_hung_up_p(filp
)) {
1675 local_irq_restore(flags
);
1676 info
->blocked_open
++;
1678 local_irq_save(flags
);
1679 if (tty
->termios
->c_cflag
& CBAUD
)
1680 rtsdtr_ctrl(SER_DTR
|SER_RTS
);
1681 local_irq_restore(flags
);
1682 set_current_state(TASK_INTERRUPTIBLE
);
1683 if (tty_hung_up_p(filp
) ||
1684 !(info
->flags
& ASYNC_INITIALIZED
)) {
1685 #ifdef SERIAL_DO_RESTART
1686 if (info
->flags
& ASYNC_HUP_NOTIFY
)
1689 retval
= -ERESTARTSYS
;
1695 if (!(info
->flags
& ASYNC_CLOSING
) &&
1696 (do_clocal
|| (!(ciab
.pra
& SER_DCD
)) ))
1698 if (signal_pending(current
)) {
1699 retval
= -ERESTARTSYS
;
1702 #ifdef SERIAL_DEBUG_OPEN
1703 printk("block_til_ready blocking: ttys%d, count = %d\n",
1704 info
->line
, state
->count
);
1710 __set_current_state(TASK_RUNNING
);
1711 remove_wait_queue(&info
->open_wait
, &wait
);
1714 info
->blocked_open
--;
1715 #ifdef SERIAL_DEBUG_OPEN
1716 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1717 info
->line
, state
->count
);
1721 info
->flags
|= ASYNC_NORMAL_ACTIVE
;
1725 static int get_async_struct(int line
, struct async_struct
**ret_info
)
1727 struct async_struct
*info
;
1728 struct serial_state
*sstate
;
1730 sstate
= rs_table
+ line
;
1733 *ret_info
= sstate
->info
;
1736 info
= kzalloc(sizeof(struct async_struct
), GFP_KERNEL
);
1741 #ifdef DECLARE_WAITQUEUE
1742 init_waitqueue_head(&info
->open_wait
);
1743 init_waitqueue_head(&info
->close_wait
);
1744 init_waitqueue_head(&info
->delta_msr_wait
);
1746 info
->magic
= SERIAL_MAGIC
;
1747 info
->port
= sstate
->port
;
1748 info
->flags
= sstate
->flags
;
1749 info
->xmit_fifo_size
= sstate
->xmit_fifo_size
;
1751 tasklet_init(&info
->tlet
, do_softint
, (unsigned long)info
);
1752 info
->state
= sstate
;
1755 *ret_info
= sstate
->info
;
1758 *ret_info
= sstate
->info
= info
;
1763 * This routine is called whenever a serial port is opened. It
1764 * enables interrupts for a serial port, linking in its async structure into
1765 * the IRQ chain. It also performs the serial-specific
1766 * initialization for the tty structure.
1768 static int rs_open(struct tty_struct
*tty
, struct file
* filp
)
1770 struct async_struct
*info
;
1774 if ((line
< 0) || (line
>= NR_PORTS
)) {
1777 retval
= get_async_struct(line
, &info
);
1781 tty
->driver_data
= info
;
1783 if (serial_paranoia_check(info
, tty
->name
, "rs_open"))
1786 #ifdef SERIAL_DEBUG_OPEN
1787 printk("rs_open %s, count = %d\n", tty
->name
, info
->state
->count
);
1789 info
->tty
->low_latency
= (info
->flags
& ASYNC_LOW_LATENCY
) ? 1 : 0;
1792 * If the port is the middle of closing, bail out now
1794 if (tty_hung_up_p(filp
) ||
1795 (info
->flags
& ASYNC_CLOSING
)) {
1796 if (info
->flags
& ASYNC_CLOSING
)
1797 interruptible_sleep_on(&info
->close_wait
);
1798 #ifdef SERIAL_DO_RESTART
1799 return ((info
->flags
& ASYNC_HUP_NOTIFY
) ?
1800 -EAGAIN
: -ERESTARTSYS
);
1807 * Start up serial port
1809 retval
= startup(info
);
1814 retval
= block_til_ready(tty
, filp
, info
);
1816 #ifdef SERIAL_DEBUG_OPEN
1817 printk("rs_open returning after block_til_ready with %d\n",
1823 #ifdef SERIAL_DEBUG_OPEN
1824 printk("rs_open %s successful...", tty
->name
);
1830 * /proc fs routines....
1833 static inline void line_info(struct seq_file
*m
, struct serial_state
*state
)
1835 struct async_struct
*info
= state
->info
, scr_info
;
1836 char stat_buf
[30], control
, status
;
1837 unsigned long flags
;
1839 seq_printf(m
, "%d: uart:amiga_builtin",state
->line
);
1842 * Figure out the current RS-232 lines
1845 info
= &scr_info
; /* This is just for serial_{in,out} */
1847 info
->magic
= SERIAL_MAGIC
;
1848 info
->flags
= state
->flags
;
1852 local_irq_save(flags
);
1854 control
= info
? info
->MCR
: status
;
1855 local_irq_restore(flags
);
1859 if(!(control
& SER_RTS
))
1860 strcat(stat_buf
, "|RTS");
1861 if(!(status
& SER_CTS
))
1862 strcat(stat_buf
, "|CTS");
1863 if(!(control
& SER_DTR
))
1864 strcat(stat_buf
, "|DTR");
1865 if(!(status
& SER_DSR
))
1866 strcat(stat_buf
, "|DSR");
1867 if(!(status
& SER_DCD
))
1868 strcat(stat_buf
, "|CD");
1871 seq_printf(m
, " baud:%d", state
->baud_base
/ info
->quot
);
1874 seq_printf(m
, " tx:%d rx:%d", state
->icount
.tx
, state
->icount
.rx
);
1876 if (state
->icount
.frame
)
1877 seq_printf(m
, " fe:%d", state
->icount
.frame
);
1879 if (state
->icount
.parity
)
1880 seq_printf(m
, " pe:%d", state
->icount
.parity
);
1882 if (state
->icount
.brk
)
1883 seq_printf(m
, " brk:%d", state
->icount
.brk
);
1885 if (state
->icount
.overrun
)
1886 seq_printf(m
, " oe:%d", state
->icount
.overrun
);
1889 * Last thing is the RS-232 status lines
1891 seq_printf(m
, " %s\n", stat_buf
+1);
1894 static int rs_proc_show(struct seq_file
*m
, void *v
)
1896 seq_printf(m
, "serinfo:1.0 driver:%s\n", serial_version
);
1897 line_info(m
, &rs_table
[0]);
1901 static int rs_proc_open(struct inode
*inode
, struct file
*file
)
1903 return single_open(file
, rs_proc_show
, NULL
);
1906 static const struct file_operations rs_proc_fops
= {
1907 .owner
= THIS_MODULE
,
1908 .open
= rs_proc_open
,
1910 .llseek
= seq_lseek
,
1911 .release
= single_release
,
1915 * ---------------------------------------------------------------------
1916 * rs_init() and friends
1918 * rs_init() is called at boot-time to initialize the serial driver.
1919 * ---------------------------------------------------------------------
1923 * This routine prints out the appropriate serial driver version
1924 * number, and identifies which options were configured into this
1927 static void show_serial_version(void)
1929 printk(KERN_INFO
"%s version %s\n", serial_name
, serial_version
);
1933 static const struct tty_operations serial_ops
= {
1937 .put_char
= rs_put_char
,
1938 .flush_chars
= rs_flush_chars
,
1939 .write_room
= rs_write_room
,
1940 .chars_in_buffer
= rs_chars_in_buffer
,
1941 .flush_buffer
= rs_flush_buffer
,
1943 .throttle
= rs_throttle
,
1944 .unthrottle
= rs_unthrottle
,
1945 .set_termios
= rs_set_termios
,
1948 .hangup
= rs_hangup
,
1949 .break_ctl
= rs_break
,
1950 .send_xchar
= rs_send_xchar
,
1951 .wait_until_sent
= rs_wait_until_sent
,
1952 .tiocmget
= rs_tiocmget
,
1953 .tiocmset
= rs_tiocmset
,
1954 .get_icount
= rs_get_icount
,
1955 .proc_fops
= &rs_proc_fops
,
1959 * The serial driver boot-time initialization code!
1961 static int __init
amiga_serial_probe(struct platform_device
*pdev
)
1963 unsigned long flags
;
1964 struct serial_state
* state
;
1967 serial_driver
= alloc_tty_driver(1);
1973 show_serial_version();
1975 /* Initialize the tty_driver structure */
1977 serial_driver
->owner
= THIS_MODULE
;
1978 serial_driver
->driver_name
= "amiserial";
1979 serial_driver
->name
= "ttyS";
1980 serial_driver
->major
= TTY_MAJOR
;
1981 serial_driver
->minor_start
= 64;
1982 serial_driver
->type
= TTY_DRIVER_TYPE_SERIAL
;
1983 serial_driver
->subtype
= SERIAL_TYPE_NORMAL
;
1984 serial_driver
->init_termios
= tty_std_termios
;
1985 serial_driver
->init_termios
.c_cflag
=
1986 B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
1987 serial_driver
->flags
= TTY_DRIVER_REAL_RAW
;
1988 tty_set_operations(serial_driver
, &serial_ops
);
1990 error
= tty_register_driver(serial_driver
);
1992 goto fail_put_tty_driver
;
1995 state
->magic
= SSTATE_MAGIC
;
1996 state
->port
= (int)&custom
.serdatr
; /* Just to give it a value */
1998 state
->custom_divisor
= 0;
1999 state
->close_delay
= 5*HZ
/10;
2000 state
->closing_wait
= 30*HZ
;
2001 state
->icount
.cts
= state
->icount
.dsr
=
2002 state
->icount
.rng
= state
->icount
.dcd
= 0;
2003 state
->icount
.rx
= state
->icount
.tx
= 0;
2004 state
->icount
.frame
= state
->icount
.parity
= 0;
2005 state
->icount
.overrun
= state
->icount
.brk
= 0;
2007 printk(KERN_INFO
"ttyS%d is the amiga builtin serial port\n",
2010 /* Hardware set up */
2012 state
->baud_base
= amiga_colorclock
;
2013 state
->xmit_fifo_size
= 1;
2015 /* set ISRs, and then disable the rx interrupts */
2016 error
= request_irq(IRQ_AMIGA_TBE
, ser_tx_int
, 0, "serial TX", state
);
2018 goto fail_unregister
;
2020 error
= request_irq(IRQ_AMIGA_RBF
, ser_rx_int
, IRQF_DISABLED
,
2021 "serial RX", state
);
2025 local_irq_save(flags
);
2027 /* turn off Rx and Tx interrupts */
2028 custom
.intena
= IF_RBF
| IF_TBE
;
2031 /* clear any pending interrupt */
2032 custom
.intreq
= IF_RBF
| IF_TBE
;
2035 local_irq_restore(flags
);
2038 * set the appropriate directions for the modem control flags,
2039 * and clear RTS and DTR
2041 ciab
.ddra
|= (SER_DTR
| SER_RTS
); /* outputs */
2042 ciab
.ddra
&= ~(SER_DCD
| SER_CTS
| SER_DSR
); /* inputs */
2044 platform_set_drvdata(pdev
, state
);
2049 free_irq(IRQ_AMIGA_TBE
, state
);
2051 tty_unregister_driver(serial_driver
);
2052 fail_put_tty_driver
:
2053 put_tty_driver(serial_driver
);
2057 static int __exit
amiga_serial_remove(struct platform_device
*pdev
)
2060 struct serial_state
*state
= platform_get_drvdata(pdev
);
2061 struct async_struct
*info
= state
->info
;
2063 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2064 tasklet_kill(&info
->tlet
);
2065 if ((error
= tty_unregister_driver(serial_driver
)))
2066 printk("SERIAL: failed to unregister serial driver (%d)\n",
2068 put_tty_driver(serial_driver
);
2070 rs_table
[0].info
= NULL
;
2073 free_irq(IRQ_AMIGA_TBE
, rs_table
);
2074 free_irq(IRQ_AMIGA_RBF
, rs_table
);
2076 platform_set_drvdata(pdev
, NULL
);
2081 static struct platform_driver amiga_serial_driver
= {
2082 .remove
= __exit_p(amiga_serial_remove
),
2084 .name
= "amiga-serial",
2085 .owner
= THIS_MODULE
,
2089 static int __init
amiga_serial_init(void)
2091 return platform_driver_probe(&amiga_serial_driver
, amiga_serial_probe
);
2094 module_init(amiga_serial_init
);
2096 static void __exit
amiga_serial_exit(void)
2098 platform_driver_unregister(&amiga_serial_driver
);
2101 module_exit(amiga_serial_exit
);
2104 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
2107 * ------------------------------------------------------------
2108 * Serial console driver
2109 * ------------------------------------------------------------
2112 static void amiga_serial_putc(char c
)
2114 custom
.serdat
= (unsigned char)c
| 0x100;
2115 while (!(custom
.serdatr
& 0x2000))
2120 * Print a string to the serial port trying not to disturb
2121 * any possible real use of the port...
2123 * The console must be locked when we get here.
2125 static void serial_console_write(struct console
*co
, const char *s
,
2128 unsigned short intena
= custom
.intenar
;
2130 custom
.intena
= IF_TBE
;
2134 amiga_serial_putc('\r');
2135 amiga_serial_putc(*s
++);
2138 custom
.intena
= IF_SETCLR
| (intena
& IF_TBE
);
2141 static struct tty_driver
*serial_console_device(struct console
*c
, int *index
)
2144 return serial_driver
;
2147 static struct console sercons
= {
2149 .write
= serial_console_write
,
2150 .device
= serial_console_device
,
2151 .flags
= CON_PRINTBUFFER
,
2158 static int __init
amiserial_console_init(void)
2160 register_console(&sercons
);
2163 console_initcall(amiserial_console_init
);
2165 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
2167 MODULE_LICENSE("GPL");
2168 MODULE_ALIAS("platform:amiga-serial");