2 * Driver core for serial ports
4 * Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
6 * Copyright 1999 ARM Limited
7 * Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/module.h>
24 #include <linux/tty.h>
25 #include <linux/tty_flip.h>
26 #include <linux/slab.h>
27 #include <linux/init.h>
28 #include <linux/console.h>
29 #include <linux/proc_fs.h>
30 #include <linux/seq_file.h>
31 #include <linux/device.h>
32 #include <linux/serial.h> /* for serial_state and serial_icounter_struct */
33 #include <linux/serial_core.h>
34 #include <linux/delay.h>
35 #include <linux/mutex.h>
38 #include <asm/uaccess.h>
41 * This is used to lock changes in serial line configuration.
43 static DEFINE_MUTEX(port_mutex
);
46 * lockdep: port->lock is initialized in two places, but we
47 * want only one lock-class:
49 static struct lock_class_key port_lock_key
;
51 #define HIGH_BITS_OFFSET ((sizeof(long)-sizeof(int))*8)
53 #ifdef CONFIG_SERIAL_CORE_CONSOLE
54 #define uart_console(port) ((port)->cons && (port)->cons->index == (port)->line)
56 #define uart_console(port) (0)
59 static void uart_change_speed(struct tty_struct
*tty
, struct uart_state
*state
,
60 struct ktermios
*old_termios
);
61 static void uart_wait_until_sent(struct tty_struct
*tty
, int timeout
);
62 static void uart_change_pm(struct uart_state
*state
, int pm_state
);
64 static void uart_port_shutdown(struct tty_port
*port
);
67 * This routine is used by the interrupt handler to schedule processing in
68 * the software interrupt portion of the driver.
70 void uart_write_wakeup(struct uart_port
*port
)
72 struct uart_state
*state
= port
->state
;
74 * This means you called this function _after_ the port was
75 * closed. No cookie for you.
78 tty_wakeup(state
->port
.tty
);
81 static void uart_stop(struct tty_struct
*tty
)
83 struct uart_state
*state
= tty
->driver_data
;
84 struct uart_port
*port
= state
->uart_port
;
87 spin_lock_irqsave(&port
->lock
, flags
);
88 port
->ops
->stop_tx(port
);
89 spin_unlock_irqrestore(&port
->lock
, flags
);
92 static void __uart_start(struct tty_struct
*tty
)
94 struct uart_state
*state
= tty
->driver_data
;
95 struct uart_port
*port
= state
->uart_port
;
97 if (!uart_circ_empty(&state
->xmit
) && state
->xmit
.buf
&&
98 !tty
->stopped
&& !tty
->hw_stopped
)
99 port
->ops
->start_tx(port
);
102 static void uart_start(struct tty_struct
*tty
)
104 struct uart_state
*state
= tty
->driver_data
;
105 struct uart_port
*port
= state
->uart_port
;
108 spin_lock_irqsave(&port
->lock
, flags
);
110 spin_unlock_irqrestore(&port
->lock
, flags
);
114 uart_update_mctrl(struct uart_port
*port
, unsigned int set
, unsigned int clear
)
119 spin_lock_irqsave(&port
->lock
, flags
);
121 port
->mctrl
= (old
& ~clear
) | set
;
122 if (old
!= port
->mctrl
)
123 port
->ops
->set_mctrl(port
, port
->mctrl
);
124 spin_unlock_irqrestore(&port
->lock
, flags
);
127 #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0)
128 #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear)
131 * Startup the port. This will be called once per open. All calls
132 * will be serialised by the per-port mutex.
134 static int uart_port_startup(struct tty_struct
*tty
, struct uart_state
*state
,
137 struct uart_port
*uport
= state
->uart_port
;
138 struct tty_port
*port
= &state
->port
;
142 if (uport
->type
== PORT_UNKNOWN
)
146 * Initialise and allocate the transmit and temporary
149 if (!state
->xmit
.buf
) {
150 /* This is protected by the per port mutex */
151 page
= get_zeroed_page(GFP_KERNEL
);
155 state
->xmit
.buf
= (unsigned char *) page
;
156 uart_circ_clear(&state
->xmit
);
159 retval
= uport
->ops
->startup(uport
);
161 if (uart_console(uport
) && uport
->cons
->cflag
) {
162 tty
->termios
.c_cflag
= uport
->cons
->cflag
;
163 uport
->cons
->cflag
= 0;
166 * Initialise the hardware port settings.
168 uart_change_speed(tty
, state
, NULL
);
172 * Setup the RTS and DTR signals once the
173 * port is open and ready to respond.
175 if (tty
->termios
.c_cflag
& CBAUD
)
176 uart_set_mctrl(uport
, TIOCM_RTS
| TIOCM_DTR
);
179 if (tty_port_cts_enabled(port
)) {
180 spin_lock_irq(&uport
->lock
);
181 if (!(uport
->ops
->get_mctrl(uport
) & TIOCM_CTS
))
183 spin_unlock_irq(&uport
->lock
);
188 * This is to allow setserial on this port. People may want to set
189 * port/irq/type and then reconfigure the port properly if it failed
192 if (retval
&& capable(CAP_SYS_ADMIN
))
198 static int uart_startup(struct tty_struct
*tty
, struct uart_state
*state
,
201 struct tty_port
*port
= &state
->port
;
204 if (port
->flags
& ASYNC_INITIALIZED
)
208 * Set the TTY IO error marker - we will only clear this
209 * once we have successfully opened the port.
211 set_bit(TTY_IO_ERROR
, &tty
->flags
);
213 retval
= uart_port_startup(tty
, state
, init_hw
);
215 set_bit(ASYNCB_INITIALIZED
, &port
->flags
);
216 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
217 } else if (retval
> 0)
224 * This routine will shutdown a serial port; interrupts are disabled, and
225 * DTR is dropped if the hangup on close termio flag is on. Calls to
226 * uart_shutdown are serialised by the per-port semaphore.
228 static void uart_shutdown(struct tty_struct
*tty
, struct uart_state
*state
)
230 struct uart_port
*uport
= state
->uart_port
;
231 struct tty_port
*port
= &state
->port
;
234 * Set the TTY IO error marker
237 set_bit(TTY_IO_ERROR
, &tty
->flags
);
239 if (test_and_clear_bit(ASYNCB_INITIALIZED
, &port
->flags
)) {
241 * Turn off DTR and RTS early.
243 if (!tty
|| (tty
->termios
.c_cflag
& HUPCL
))
244 uart_clear_mctrl(uport
, TIOCM_DTR
| TIOCM_RTS
);
246 uart_port_shutdown(port
);
250 * It's possible for shutdown to be called after suspend if we get
251 * a DCD drop (hangup) at just the right time. Clear suspended bit so
252 * we don't try to resume a port that has been shutdown.
254 clear_bit(ASYNCB_SUSPENDED
, &port
->flags
);
257 * Free the transmit buffer page.
259 if (state
->xmit
.buf
) {
260 free_page((unsigned long)state
->xmit
.buf
);
261 state
->xmit
.buf
= NULL
;
266 * uart_update_timeout - update per-port FIFO timeout.
267 * @port: uart_port structure describing the port
268 * @cflag: termios cflag value
269 * @baud: speed of the port
271 * Set the port FIFO timeout value. The @cflag value should
272 * reflect the actual hardware settings.
275 uart_update_timeout(struct uart_port
*port
, unsigned int cflag
,
280 /* byte size and parity */
281 switch (cflag
& CSIZE
) {
302 * The total number of bits to be transmitted in the fifo.
304 bits
= bits
* port
->fifosize
;
307 * Figure the timeout to send the above number of bits.
308 * Add .02 seconds of slop
310 port
->timeout
= (HZ
* bits
) / baud
+ HZ
/50;
313 EXPORT_SYMBOL(uart_update_timeout
);
316 * uart_get_baud_rate - return baud rate for a particular port
317 * @port: uart_port structure describing the port in question.
318 * @termios: desired termios settings.
319 * @old: old termios (or NULL)
320 * @min: minimum acceptable baud rate
321 * @max: maximum acceptable baud rate
323 * Decode the termios structure into a numeric baud rate,
324 * taking account of the magic 38400 baud rate (with spd_*
325 * flags), and mapping the %B0 rate to 9600 baud.
327 * If the new baud rate is invalid, try the old termios setting.
328 * If it's still invalid, we try 9600 baud.
330 * Update the @termios structure to reflect the baud rate
331 * we're actually going to be using. Don't do this for the case
332 * where B0 is requested ("hang up").
335 uart_get_baud_rate(struct uart_port
*port
, struct ktermios
*termios
,
336 struct ktermios
*old
, unsigned int min
, unsigned int max
)
338 unsigned int try, baud
, altbaud
= 38400;
340 upf_t flags
= port
->flags
& UPF_SPD_MASK
;
342 if (flags
== UPF_SPD_HI
)
344 else if (flags
== UPF_SPD_VHI
)
346 else if (flags
== UPF_SPD_SHI
)
348 else if (flags
== UPF_SPD_WARP
)
351 for (try = 0; try < 2; try++) {
352 baud
= tty_termios_baud_rate(termios
);
355 * The spd_hi, spd_vhi, spd_shi, spd_warp kludge...
362 * Special case: B0 rate.
369 if (baud
>= min
&& baud
<= max
)
373 * Oops, the quotient was zero. Try again with
374 * the old baud rate if possible.
376 termios
->c_cflag
&= ~CBAUD
;
378 baud
= tty_termios_baud_rate(old
);
380 tty_termios_encode_baud_rate(termios
,
387 * As a last resort, if the range cannot be met then clip to
388 * the nearest chip supported rate.
392 tty_termios_encode_baud_rate(termios
,
395 tty_termios_encode_baud_rate(termios
,
399 /* Should never happen */
404 EXPORT_SYMBOL(uart_get_baud_rate
);
407 * uart_get_divisor - return uart clock divisor
408 * @port: uart_port structure describing the port.
409 * @baud: desired baud rate
411 * Calculate the uart clock divisor for the port.
414 uart_get_divisor(struct uart_port
*port
, unsigned int baud
)
419 * Old custom speed handling.
421 if (baud
== 38400 && (port
->flags
& UPF_SPD_MASK
) == UPF_SPD_CUST
)
422 quot
= port
->custom_divisor
;
424 quot
= DIV_ROUND_CLOSEST(port
->uartclk
, 16 * baud
);
429 EXPORT_SYMBOL(uart_get_divisor
);
431 /* FIXME: Consistent locking policy */
432 static void uart_change_speed(struct tty_struct
*tty
, struct uart_state
*state
,
433 struct ktermios
*old_termios
)
435 struct tty_port
*port
= &state
->port
;
436 struct uart_port
*uport
= state
->uart_port
;
437 struct ktermios
*termios
;
440 * If we have no tty, termios, or the port does not exist,
441 * then we can't set the parameters for this port.
443 if (!tty
|| uport
->type
== PORT_UNKNOWN
)
446 termios
= &tty
->termios
;
449 * Set flags based on termios cflag
451 if (termios
->c_cflag
& CRTSCTS
)
452 set_bit(ASYNCB_CTS_FLOW
, &port
->flags
);
454 clear_bit(ASYNCB_CTS_FLOW
, &port
->flags
);
456 if (termios
->c_cflag
& CLOCAL
)
457 clear_bit(ASYNCB_CHECK_CD
, &port
->flags
);
459 set_bit(ASYNCB_CHECK_CD
, &port
->flags
);
461 uport
->ops
->set_termios(uport
, termios
, old_termios
);
464 static inline int __uart_put_char(struct uart_port
*port
,
465 struct circ_buf
*circ
, unsigned char c
)
473 spin_lock_irqsave(&port
->lock
, flags
);
474 if (uart_circ_chars_free(circ
) != 0) {
475 circ
->buf
[circ
->head
] = c
;
476 circ
->head
= (circ
->head
+ 1) & (UART_XMIT_SIZE
- 1);
479 spin_unlock_irqrestore(&port
->lock
, flags
);
483 static int uart_put_char(struct tty_struct
*tty
, unsigned char ch
)
485 struct uart_state
*state
= tty
->driver_data
;
487 return __uart_put_char(state
->uart_port
, &state
->xmit
, ch
);
490 static void uart_flush_chars(struct tty_struct
*tty
)
495 static int uart_write(struct tty_struct
*tty
,
496 const unsigned char *buf
, int count
)
498 struct uart_state
*state
= tty
->driver_data
;
499 struct uart_port
*port
;
500 struct circ_buf
*circ
;
505 * This means you called this function _after_ the port was
506 * closed. No cookie for you.
513 port
= state
->uart_port
;
519 spin_lock_irqsave(&port
->lock
, flags
);
521 c
= CIRC_SPACE_TO_END(circ
->head
, circ
->tail
, UART_XMIT_SIZE
);
526 memcpy(circ
->buf
+ circ
->head
, buf
, c
);
527 circ
->head
= (circ
->head
+ c
) & (UART_XMIT_SIZE
- 1);
532 spin_unlock_irqrestore(&port
->lock
, flags
);
538 static int uart_write_room(struct tty_struct
*tty
)
540 struct uart_state
*state
= tty
->driver_data
;
544 spin_lock_irqsave(&state
->uart_port
->lock
, flags
);
545 ret
= uart_circ_chars_free(&state
->xmit
);
546 spin_unlock_irqrestore(&state
->uart_port
->lock
, flags
);
550 static int uart_chars_in_buffer(struct tty_struct
*tty
)
552 struct uart_state
*state
= tty
->driver_data
;
556 spin_lock_irqsave(&state
->uart_port
->lock
, flags
);
557 ret
= uart_circ_chars_pending(&state
->xmit
);
558 spin_unlock_irqrestore(&state
->uart_port
->lock
, flags
);
562 static void uart_flush_buffer(struct tty_struct
*tty
)
564 struct uart_state
*state
= tty
->driver_data
;
565 struct uart_port
*port
;
569 * This means you called this function _after_ the port was
570 * closed. No cookie for you.
577 port
= state
->uart_port
;
578 pr_debug("uart_flush_buffer(%d) called\n", tty
->index
);
580 spin_lock_irqsave(&port
->lock
, flags
);
581 uart_circ_clear(&state
->xmit
);
582 if (port
->ops
->flush_buffer
)
583 port
->ops
->flush_buffer(port
);
584 spin_unlock_irqrestore(&port
->lock
, flags
);
589 * This function is used to send a high-priority XON/XOFF character to
592 static void uart_send_xchar(struct tty_struct
*tty
, char ch
)
594 struct uart_state
*state
= tty
->driver_data
;
595 struct uart_port
*port
= state
->uart_port
;
598 if (port
->ops
->send_xchar
)
599 port
->ops
->send_xchar(port
, ch
);
603 spin_lock_irqsave(&port
->lock
, flags
);
604 port
->ops
->start_tx(port
);
605 spin_unlock_irqrestore(&port
->lock
, flags
);
610 static void uart_throttle(struct tty_struct
*tty
)
612 struct uart_state
*state
= tty
->driver_data
;
615 uart_send_xchar(tty
, STOP_CHAR(tty
));
617 if (tty
->termios
.c_cflag
& CRTSCTS
)
618 uart_clear_mctrl(state
->uart_port
, TIOCM_RTS
);
621 static void uart_unthrottle(struct tty_struct
*tty
)
623 struct uart_state
*state
= tty
->driver_data
;
624 struct uart_port
*port
= state
->uart_port
;
630 uart_send_xchar(tty
, START_CHAR(tty
));
633 if (tty
->termios
.c_cflag
& CRTSCTS
)
634 uart_set_mctrl(port
, TIOCM_RTS
);
637 static void do_uart_get_info(struct tty_port
*port
,
638 struct serial_struct
*retinfo
)
640 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
641 struct uart_port
*uport
= state
->uart_port
;
643 memset(retinfo
, 0, sizeof(*retinfo
));
645 retinfo
->type
= uport
->type
;
646 retinfo
->line
= uport
->line
;
647 retinfo
->port
= uport
->iobase
;
648 if (HIGH_BITS_OFFSET
)
649 retinfo
->port_high
= (long) uport
->iobase
>> HIGH_BITS_OFFSET
;
650 retinfo
->irq
= uport
->irq
;
651 retinfo
->flags
= uport
->flags
;
652 retinfo
->xmit_fifo_size
= uport
->fifosize
;
653 retinfo
->baud_base
= uport
->uartclk
/ 16;
654 retinfo
->close_delay
= jiffies_to_msecs(port
->close_delay
) / 10;
655 retinfo
->closing_wait
= port
->closing_wait
== ASYNC_CLOSING_WAIT_NONE
?
656 ASYNC_CLOSING_WAIT_NONE
:
657 jiffies_to_msecs(port
->closing_wait
) / 10;
658 retinfo
->custom_divisor
= uport
->custom_divisor
;
659 retinfo
->hub6
= uport
->hub6
;
660 retinfo
->io_type
= uport
->iotype
;
661 retinfo
->iomem_reg_shift
= uport
->regshift
;
662 retinfo
->iomem_base
= (void *)(unsigned long)uport
->mapbase
;
665 static void uart_get_info(struct tty_port
*port
,
666 struct serial_struct
*retinfo
)
668 /* Ensure the state we copy is consistent and no hardware changes
670 mutex_lock(&port
->mutex
);
671 do_uart_get_info(port
, retinfo
);
672 mutex_unlock(&port
->mutex
);
675 static int uart_get_info_user(struct tty_port
*port
,
676 struct serial_struct __user
*retinfo
)
678 struct serial_struct tmp
;
679 uart_get_info(port
, &tmp
);
681 if (copy_to_user(retinfo
, &tmp
, sizeof(*retinfo
)))
686 static int uart_set_info(struct tty_struct
*tty
, struct tty_port
*port
,
687 struct uart_state
*state
,
688 struct serial_struct
*new_info
)
690 struct uart_port
*uport
= state
->uart_port
;
691 unsigned long new_port
;
692 unsigned int change_irq
, change_port
, closing_wait
;
693 unsigned int old_custom_divisor
, close_delay
;
694 upf_t old_flags
, new_flags
;
697 new_port
= new_info
->port
;
698 if (HIGH_BITS_OFFSET
)
699 new_port
+= (unsigned long) new_info
->port_high
<< HIGH_BITS_OFFSET
;
701 new_info
->irq
= irq_canonicalize(new_info
->irq
);
702 close_delay
= msecs_to_jiffies(new_info
->close_delay
* 10);
703 closing_wait
= new_info
->closing_wait
== ASYNC_CLOSING_WAIT_NONE
?
704 ASYNC_CLOSING_WAIT_NONE
:
705 msecs_to_jiffies(new_info
->closing_wait
* 10);
708 change_irq
= !(uport
->flags
& UPF_FIXED_PORT
)
709 && new_info
->irq
!= uport
->irq
;
712 * Since changing the 'type' of the port changes its resource
713 * allocations, we should treat type changes the same as
716 change_port
= !(uport
->flags
& UPF_FIXED_PORT
)
717 && (new_port
!= uport
->iobase
||
718 (unsigned long)new_info
->iomem_base
!= uport
->mapbase
||
719 new_info
->hub6
!= uport
->hub6
||
720 new_info
->io_type
!= uport
->iotype
||
721 new_info
->iomem_reg_shift
!= uport
->regshift
||
722 new_info
->type
!= uport
->type
);
724 old_flags
= uport
->flags
;
725 new_flags
= new_info
->flags
;
726 old_custom_divisor
= uport
->custom_divisor
;
728 if (!capable(CAP_SYS_ADMIN
)) {
730 if (change_irq
|| change_port
||
731 (new_info
->baud_base
!= uport
->uartclk
/ 16) ||
732 (close_delay
!= port
->close_delay
) ||
733 (closing_wait
!= port
->closing_wait
) ||
734 (new_info
->xmit_fifo_size
&&
735 new_info
->xmit_fifo_size
!= uport
->fifosize
) ||
736 (((new_flags
^ old_flags
) & ~UPF_USR_MASK
) != 0))
738 uport
->flags
= ((uport
->flags
& ~UPF_USR_MASK
) |
739 (new_flags
& UPF_USR_MASK
));
740 uport
->custom_divisor
= new_info
->custom_divisor
;
745 * Ask the low level driver to verify the settings.
747 if (uport
->ops
->verify_port
)
748 retval
= uport
->ops
->verify_port(uport
, new_info
);
750 if ((new_info
->irq
>= nr_irqs
) || (new_info
->irq
< 0) ||
751 (new_info
->baud_base
< 9600))
757 if (change_port
|| change_irq
) {
761 * Make sure that we are the sole user of this port.
763 if (tty_port_users(port
) > 1)
767 * We need to shutdown the serial port at the old
768 * port/type/irq combination.
770 uart_shutdown(tty
, state
);
774 unsigned long old_iobase
, old_mapbase
;
775 unsigned int old_type
, old_iotype
, old_hub6
, old_shift
;
777 old_iobase
= uport
->iobase
;
778 old_mapbase
= uport
->mapbase
;
779 old_type
= uport
->type
;
780 old_hub6
= uport
->hub6
;
781 old_iotype
= uport
->iotype
;
782 old_shift
= uport
->regshift
;
785 * Free and release old regions
787 if (old_type
!= PORT_UNKNOWN
)
788 uport
->ops
->release_port(uport
);
790 uport
->iobase
= new_port
;
791 uport
->type
= new_info
->type
;
792 uport
->hub6
= new_info
->hub6
;
793 uport
->iotype
= new_info
->io_type
;
794 uport
->regshift
= new_info
->iomem_reg_shift
;
795 uport
->mapbase
= (unsigned long)new_info
->iomem_base
;
798 * Claim and map the new regions
800 if (uport
->type
!= PORT_UNKNOWN
) {
801 retval
= uport
->ops
->request_port(uport
);
803 /* Always success - Jean II */
808 * If we fail to request resources for the
809 * new port, try to restore the old settings.
811 if (retval
&& old_type
!= PORT_UNKNOWN
) {
812 uport
->iobase
= old_iobase
;
813 uport
->type
= old_type
;
814 uport
->hub6
= old_hub6
;
815 uport
->iotype
= old_iotype
;
816 uport
->regshift
= old_shift
;
817 uport
->mapbase
= old_mapbase
;
818 retval
= uport
->ops
->request_port(uport
);
820 * If we failed to restore the old settings,
824 uport
->type
= PORT_UNKNOWN
;
830 /* Added to return the correct error -Ram Gupta */
836 uport
->irq
= new_info
->irq
;
837 if (!(uport
->flags
& UPF_FIXED_PORT
))
838 uport
->uartclk
= new_info
->baud_base
* 16;
839 uport
->flags
= (uport
->flags
& ~UPF_CHANGE_MASK
) |
840 (new_flags
& UPF_CHANGE_MASK
);
841 uport
->custom_divisor
= new_info
->custom_divisor
;
842 port
->close_delay
= close_delay
;
843 port
->closing_wait
= closing_wait
;
844 if (new_info
->xmit_fifo_size
)
845 uport
->fifosize
= new_info
->xmit_fifo_size
;
847 port
->tty
->low_latency
=
848 (uport
->flags
& UPF_LOW_LATENCY
) ? 1 : 0;
852 if (uport
->type
== PORT_UNKNOWN
)
854 if (port
->flags
& ASYNC_INITIALIZED
) {
855 if (((old_flags
^ uport
->flags
) & UPF_SPD_MASK
) ||
856 old_custom_divisor
!= uport
->custom_divisor
) {
858 * If they're setting up a custom divisor or speed,
859 * instead of clearing it, then bitch about it. No
860 * need to rate-limit; it's CAP_SYS_ADMIN only.
862 if (uport
->flags
& UPF_SPD_MASK
) {
865 "%s sets custom speed on %s. This "
866 "is deprecated.\n", current
->comm
,
867 tty_name(port
->tty
, buf
));
869 uart_change_speed(tty
, state
, NULL
);
872 retval
= uart_startup(tty
, state
, 1);
877 static int uart_set_info_user(struct tty_struct
*tty
, struct uart_state
*state
,
878 struct serial_struct __user
*newinfo
)
880 struct serial_struct new_serial
;
881 struct tty_port
*port
= &state
->port
;
884 if (copy_from_user(&new_serial
, newinfo
, sizeof(new_serial
)))
888 * This semaphore protects port->count. It is also
889 * very useful to prevent opens. Also, take the
890 * port configuration semaphore to make sure that a
891 * module insertion/removal doesn't change anything
894 mutex_lock(&port
->mutex
);
895 retval
= uart_set_info(tty
, port
, state
, &new_serial
);
896 mutex_unlock(&port
->mutex
);
901 * uart_get_lsr_info - get line status register info
902 * @tty: tty associated with the UART
903 * @state: UART being queried
904 * @value: returned modem value
906 * Note: uart_ioctl protects us against hangups.
908 static int uart_get_lsr_info(struct tty_struct
*tty
,
909 struct uart_state
*state
, unsigned int __user
*value
)
911 struct uart_port
*uport
= state
->uart_port
;
914 result
= uport
->ops
->tx_empty(uport
);
917 * If we're about to load something into the transmit
918 * register, we'll pretend the transmitter isn't empty to
919 * avoid a race condition (depending on when the transmit
920 * interrupt happens).
923 ((uart_circ_chars_pending(&state
->xmit
) > 0) &&
924 !tty
->stopped
&& !tty
->hw_stopped
))
925 result
&= ~TIOCSER_TEMT
;
927 return put_user(result
, value
);
930 static int uart_tiocmget(struct tty_struct
*tty
)
932 struct uart_state
*state
= tty
->driver_data
;
933 struct tty_port
*port
= &state
->port
;
934 struct uart_port
*uport
= state
->uart_port
;
937 mutex_lock(&port
->mutex
);
938 if (!(tty
->flags
& (1 << TTY_IO_ERROR
))) {
939 result
= uport
->mctrl
;
940 spin_lock_irq(&uport
->lock
);
941 result
|= uport
->ops
->get_mctrl(uport
);
942 spin_unlock_irq(&uport
->lock
);
944 mutex_unlock(&port
->mutex
);
950 uart_tiocmset(struct tty_struct
*tty
, unsigned int set
, unsigned int clear
)
952 struct uart_state
*state
= tty
->driver_data
;
953 struct uart_port
*uport
= state
->uart_port
;
954 struct tty_port
*port
= &state
->port
;
957 mutex_lock(&port
->mutex
);
958 if (!(tty
->flags
& (1 << TTY_IO_ERROR
))) {
959 uart_update_mctrl(uport
, set
, clear
);
962 mutex_unlock(&port
->mutex
);
966 static int uart_break_ctl(struct tty_struct
*tty
, int break_state
)
968 struct uart_state
*state
= tty
->driver_data
;
969 struct tty_port
*port
= &state
->port
;
970 struct uart_port
*uport
= state
->uart_port
;
972 mutex_lock(&port
->mutex
);
974 if (uport
->type
!= PORT_UNKNOWN
)
975 uport
->ops
->break_ctl(uport
, break_state
);
977 mutex_unlock(&port
->mutex
);
981 static int uart_do_autoconfig(struct tty_struct
*tty
,struct uart_state
*state
)
983 struct uart_port
*uport
= state
->uart_port
;
984 struct tty_port
*port
= &state
->port
;
987 if (!capable(CAP_SYS_ADMIN
))
991 * Take the per-port semaphore. This prevents count from
992 * changing, and hence any extra opens of the port while
993 * we're auto-configuring.
995 if (mutex_lock_interruptible(&port
->mutex
))
999 if (tty_port_users(port
) == 1) {
1000 uart_shutdown(tty
, state
);
1003 * If we already have a port type configured,
1004 * we must release its resources.
1006 if (uport
->type
!= PORT_UNKNOWN
)
1007 uport
->ops
->release_port(uport
);
1009 flags
= UART_CONFIG_TYPE
;
1010 if (uport
->flags
& UPF_AUTO_IRQ
)
1011 flags
|= UART_CONFIG_IRQ
;
1014 * This will claim the ports resources if
1017 uport
->ops
->config_port(uport
, flags
);
1019 ret
= uart_startup(tty
, state
, 1);
1021 mutex_unlock(&port
->mutex
);
1026 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1027 * - mask passed in arg for lines of interest
1028 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1029 * Caller should use TIOCGICOUNT to see which one it was
1031 * FIXME: This wants extracting into a common all driver implementation
1032 * of TIOCMWAIT using tty_port.
1035 uart_wait_modem_status(struct uart_state
*state
, unsigned long arg
)
1037 struct uart_port
*uport
= state
->uart_port
;
1038 struct tty_port
*port
= &state
->port
;
1039 DECLARE_WAITQUEUE(wait
, current
);
1040 struct uart_icount cprev
, cnow
;
1044 * note the counters on entry
1046 spin_lock_irq(&uport
->lock
);
1047 memcpy(&cprev
, &uport
->icount
, sizeof(struct uart_icount
));
1050 * Force modem status interrupts on
1052 uport
->ops
->enable_ms(uport
);
1053 spin_unlock_irq(&uport
->lock
);
1055 add_wait_queue(&port
->delta_msr_wait
, &wait
);
1057 spin_lock_irq(&uport
->lock
);
1058 memcpy(&cnow
, &uport
->icount
, sizeof(struct uart_icount
));
1059 spin_unlock_irq(&uport
->lock
);
1061 set_current_state(TASK_INTERRUPTIBLE
);
1063 if (((arg
& TIOCM_RNG
) && (cnow
.rng
!= cprev
.rng
)) ||
1064 ((arg
& TIOCM_DSR
) && (cnow
.dsr
!= cprev
.dsr
)) ||
1065 ((arg
& TIOCM_CD
) && (cnow
.dcd
!= cprev
.dcd
)) ||
1066 ((arg
& TIOCM_CTS
) && (cnow
.cts
!= cprev
.cts
))) {
1073 /* see if a signal did it */
1074 if (signal_pending(current
)) {
1082 current
->state
= TASK_RUNNING
;
1083 remove_wait_queue(&port
->delta_msr_wait
, &wait
);
1089 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1090 * Return: write counters to the user passed counter struct
1091 * NB: both 1->0 and 0->1 transitions are counted except for
1092 * RI where only 0->1 is counted.
1094 static int uart_get_icount(struct tty_struct
*tty
,
1095 struct serial_icounter_struct
*icount
)
1097 struct uart_state
*state
= tty
->driver_data
;
1098 struct uart_icount cnow
;
1099 struct uart_port
*uport
= state
->uart_port
;
1101 spin_lock_irq(&uport
->lock
);
1102 memcpy(&cnow
, &uport
->icount
, sizeof(struct uart_icount
));
1103 spin_unlock_irq(&uport
->lock
);
1105 icount
->cts
= cnow
.cts
;
1106 icount
->dsr
= cnow
.dsr
;
1107 icount
->rng
= cnow
.rng
;
1108 icount
->dcd
= cnow
.dcd
;
1109 icount
->rx
= cnow
.rx
;
1110 icount
->tx
= cnow
.tx
;
1111 icount
->frame
= cnow
.frame
;
1112 icount
->overrun
= cnow
.overrun
;
1113 icount
->parity
= cnow
.parity
;
1114 icount
->brk
= cnow
.brk
;
1115 icount
->buf_overrun
= cnow
.buf_overrun
;
1121 * Called via sys_ioctl. We can use spin_lock_irq() here.
1124 uart_ioctl(struct tty_struct
*tty
, unsigned int cmd
,
1127 struct uart_state
*state
= tty
->driver_data
;
1128 struct tty_port
*port
= &state
->port
;
1129 void __user
*uarg
= (void __user
*)arg
;
1130 int ret
= -ENOIOCTLCMD
;
1134 * These ioctls don't rely on the hardware to be present.
1138 ret
= uart_get_info_user(port
, uarg
);
1142 ret
= uart_set_info_user(tty
, state
, uarg
);
1146 ret
= uart_do_autoconfig(tty
, state
);
1149 case TIOCSERGWILD
: /* obsolete */
1150 case TIOCSERSWILD
: /* obsolete */
1155 if (ret
!= -ENOIOCTLCMD
)
1158 if (tty
->flags
& (1 << TTY_IO_ERROR
)) {
1164 * The following should only be used when hardware is present.
1168 ret
= uart_wait_modem_status(state
, arg
);
1172 if (ret
!= -ENOIOCTLCMD
)
1175 mutex_lock(&port
->mutex
);
1177 if (tty
->flags
& (1 << TTY_IO_ERROR
)) {
1183 * All these rely on hardware being present and need to be
1184 * protected against the tty being hung up.
1187 case TIOCSERGETLSR
: /* Get line status register */
1188 ret
= uart_get_lsr_info(tty
, state
, uarg
);
1192 struct uart_port
*uport
= state
->uart_port
;
1193 if (uport
->ops
->ioctl
)
1194 ret
= uport
->ops
->ioctl(uport
, cmd
, arg
);
1199 mutex_unlock(&port
->mutex
);
1204 static void uart_set_ldisc(struct tty_struct
*tty
)
1206 struct uart_state
*state
= tty
->driver_data
;
1207 struct uart_port
*uport
= state
->uart_port
;
1209 if (uport
->ops
->set_ldisc
)
1210 uport
->ops
->set_ldisc(uport
, tty
->termios
.c_line
);
1213 static void uart_set_termios(struct tty_struct
*tty
,
1214 struct ktermios
*old_termios
)
1216 struct uart_state
*state
= tty
->driver_data
;
1217 unsigned long flags
;
1218 unsigned int cflag
= tty
->termios
.c_cflag
;
1222 * These are the bits that are used to setup various
1223 * flags in the low level driver. We can ignore the Bfoo
1224 * bits in c_cflag; c_[io]speed will always be set
1225 * appropriately by set_termios() in tty_ioctl.c
1227 #define RELEVANT_IFLAG(iflag) ((iflag) & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
1228 if ((cflag
^ old_termios
->c_cflag
) == 0 &&
1229 tty
->termios
.c_ospeed
== old_termios
->c_ospeed
&&
1230 tty
->termios
.c_ispeed
== old_termios
->c_ispeed
&&
1231 RELEVANT_IFLAG(tty
->termios
.c_iflag
^ old_termios
->c_iflag
) == 0) {
1235 uart_change_speed(tty
, state
, old_termios
);
1237 /* Handle transition to B0 status */
1238 if ((old_termios
->c_cflag
& CBAUD
) && !(cflag
& CBAUD
))
1239 uart_clear_mctrl(state
->uart_port
, TIOCM_RTS
| TIOCM_DTR
);
1240 /* Handle transition away from B0 status */
1241 else if (!(old_termios
->c_cflag
& CBAUD
) && (cflag
& CBAUD
)) {
1242 unsigned int mask
= TIOCM_DTR
;
1243 if (!(cflag
& CRTSCTS
) ||
1244 !test_bit(TTY_THROTTLED
, &tty
->flags
))
1246 uart_set_mctrl(state
->uart_port
, mask
);
1249 /* Handle turning off CRTSCTS */
1250 if ((old_termios
->c_cflag
& CRTSCTS
) && !(cflag
& CRTSCTS
)) {
1251 spin_lock_irqsave(&state
->uart_port
->lock
, flags
);
1252 tty
->hw_stopped
= 0;
1254 spin_unlock_irqrestore(&state
->uart_port
->lock
, flags
);
1256 /* Handle turning on CRTSCTS */
1257 else if (!(old_termios
->c_cflag
& CRTSCTS
) && (cflag
& CRTSCTS
)) {
1258 spin_lock_irqsave(&state
->uart_port
->lock
, flags
);
1259 if (!(state
->uart_port
->ops
->get_mctrl(state
->uart_port
) & TIOCM_CTS
)) {
1260 tty
->hw_stopped
= 1;
1261 state
->uart_port
->ops
->stop_tx(state
->uart_port
);
1263 spin_unlock_irqrestore(&state
->uart_port
->lock
, flags
);
1268 * In 2.4.5, calls to this will be serialized via the BKL in
1269 * linux/drivers/char/tty_io.c:tty_release()
1270 * linux/drivers/char/tty_io.c:do_tty_handup()
1272 static void uart_close(struct tty_struct
*tty
, struct file
*filp
)
1274 struct uart_state
*state
= tty
->driver_data
;
1275 struct tty_port
*port
;
1276 struct uart_port
*uport
;
1277 unsigned long flags
;
1282 uport
= state
->uart_port
;
1283 port
= &state
->port
;
1285 pr_debug("uart_close(%d) called\n", uport
->line
);
1287 if (tty_port_close_start(port
, tty
, filp
) == 0)
1291 * At this point, we stop accepting input. To do this, we
1292 * disable the receive line status interrupts.
1294 if (port
->flags
& ASYNC_INITIALIZED
) {
1295 unsigned long flags
;
1296 spin_lock_irqsave(&uport
->lock
, flags
);
1297 uport
->ops
->stop_rx(uport
);
1298 spin_unlock_irqrestore(&uport
->lock
, flags
);
1300 * Before we drop DTR, make sure the UART transmitter
1301 * has completely drained; this is especially
1302 * important if there is a transmit FIFO!
1304 uart_wait_until_sent(tty
, uport
->timeout
);
1307 mutex_lock(&port
->mutex
);
1308 uart_shutdown(tty
, state
);
1309 uart_flush_buffer(tty
);
1311 tty_ldisc_flush(tty
);
1313 tty_port_tty_set(port
, NULL
);
1314 spin_lock_irqsave(&port
->lock
, flags
);
1317 if (port
->blocked_open
) {
1318 spin_unlock_irqrestore(&port
->lock
, flags
);
1319 if (port
->close_delay
)
1320 msleep_interruptible(
1321 jiffies_to_msecs(port
->close_delay
));
1322 spin_lock_irqsave(&port
->lock
, flags
);
1323 } else if (!uart_console(uport
)) {
1324 spin_unlock_irqrestore(&port
->lock
, flags
);
1325 uart_change_pm(state
, 3);
1326 spin_lock_irqsave(&port
->lock
, flags
);
1330 * Wake up anyone trying to open this port.
1332 clear_bit(ASYNCB_NORMAL_ACTIVE
, &port
->flags
);
1333 clear_bit(ASYNCB_CLOSING
, &port
->flags
);
1334 spin_unlock_irqrestore(&port
->lock
, flags
);
1335 wake_up_interruptible(&port
->open_wait
);
1336 wake_up_interruptible(&port
->close_wait
);
1338 mutex_unlock(&port
->mutex
);
1341 static void uart_wait_until_sent(struct tty_struct
*tty
, int timeout
)
1343 struct uart_state
*state
= tty
->driver_data
;
1344 struct uart_port
*port
= state
->uart_port
;
1345 unsigned long char_time
, expire
;
1347 if (port
->type
== PORT_UNKNOWN
|| port
->fifosize
== 0)
1351 * Set the check interval to be 1/5 of the estimated time to
1352 * send a single character, and make it at least 1. The check
1353 * interval should also be less than the timeout.
1355 * Note: we have to use pretty tight timings here to satisfy
1358 char_time
= (port
->timeout
- HZ
/50) / port
->fifosize
;
1359 char_time
= char_time
/ 5;
1362 if (timeout
&& timeout
< char_time
)
1363 char_time
= timeout
;
1366 * If the transmitter hasn't cleared in twice the approximate
1367 * amount of time to send the entire FIFO, it probably won't
1368 * ever clear. This assumes the UART isn't doing flow
1369 * control, which is currently the case. Hence, if it ever
1370 * takes longer than port->timeout, this is probably due to a
1371 * UART bug of some kind. So, we clamp the timeout parameter at
1374 if (timeout
== 0 || timeout
> 2 * port
->timeout
)
1375 timeout
= 2 * port
->timeout
;
1377 expire
= jiffies
+ timeout
;
1379 pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n",
1380 port
->line
, jiffies
, expire
);
1383 * Check whether the transmitter is empty every 'char_time'.
1384 * 'timeout' / 'expire' give us the maximum amount of time
1387 while (!port
->ops
->tx_empty(port
)) {
1388 msleep_interruptible(jiffies_to_msecs(char_time
));
1389 if (signal_pending(current
))
1391 if (time_after(jiffies
, expire
))
1397 * This is called with the BKL held in
1398 * linux/drivers/char/tty_io.c:do_tty_hangup()
1399 * We're called from the eventd thread, so we can sleep for
1400 * a _short_ time only.
1402 static void uart_hangup(struct tty_struct
*tty
)
1404 struct uart_state
*state
= tty
->driver_data
;
1405 struct tty_port
*port
= &state
->port
;
1406 unsigned long flags
;
1408 pr_debug("uart_hangup(%d)\n", state
->uart_port
->line
);
1410 mutex_lock(&port
->mutex
);
1411 if (port
->flags
& ASYNC_NORMAL_ACTIVE
) {
1412 uart_flush_buffer(tty
);
1413 uart_shutdown(tty
, state
);
1414 spin_lock_irqsave(&port
->lock
, flags
);
1416 clear_bit(ASYNCB_NORMAL_ACTIVE
, &port
->flags
);
1417 spin_unlock_irqrestore(&port
->lock
, flags
);
1418 tty_port_tty_set(port
, NULL
);
1419 wake_up_interruptible(&port
->open_wait
);
1420 wake_up_interruptible(&port
->delta_msr_wait
);
1422 mutex_unlock(&port
->mutex
);
1425 static int uart_port_activate(struct tty_port
*port
, struct tty_struct
*tty
)
1430 static void uart_port_shutdown(struct tty_port
*port
)
1432 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
1433 struct uart_port
*uport
= state
->uart_port
;
1436 * clear delta_msr_wait queue to avoid mem leaks: we may free
1437 * the irq here so the queue might never be woken up. Note
1438 * that we won't end up waiting on delta_msr_wait again since
1439 * any outstanding file descriptors should be pointing at
1440 * hung_up_tty_fops now.
1442 wake_up_interruptible(&port
->delta_msr_wait
);
1445 * Free the IRQ and disable the port.
1447 uport
->ops
->shutdown(uport
);
1450 * Ensure that the IRQ handler isn't running on another CPU.
1452 synchronize_irq(uport
->irq
);
1455 static int uart_carrier_raised(struct tty_port
*port
)
1457 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
1458 struct uart_port
*uport
= state
->uart_port
;
1460 spin_lock_irq(&uport
->lock
);
1461 uport
->ops
->enable_ms(uport
);
1462 mctrl
= uport
->ops
->get_mctrl(uport
);
1463 spin_unlock_irq(&uport
->lock
);
1464 if (mctrl
& TIOCM_CAR
)
1469 static void uart_dtr_rts(struct tty_port
*port
, int onoff
)
1471 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
1472 struct uart_port
*uport
= state
->uart_port
;
1475 uart_set_mctrl(uport
, TIOCM_DTR
| TIOCM_RTS
);
1477 uart_clear_mctrl(uport
, TIOCM_DTR
| TIOCM_RTS
);
1481 * calls to uart_open are serialised by the BKL in
1482 * fs/char_dev.c:chrdev_open()
1483 * Note that if this fails, then uart_close() _will_ be called.
1485 * In time, we want to scrap the "opening nonpresent ports"
1486 * behaviour and implement an alternative way for setserial
1487 * to set base addresses/ports/types. This will allow us to
1488 * get rid of a certain amount of extra tests.
1490 static int uart_open(struct tty_struct
*tty
, struct file
*filp
)
1492 struct uart_driver
*drv
= (struct uart_driver
*)tty
->driver
->driver_state
;
1493 int retval
, line
= tty
->index
;
1494 struct uart_state
*state
= drv
->state
+ line
;
1495 struct tty_port
*port
= &state
->port
;
1497 pr_debug("uart_open(%d) called\n", line
);
1500 * We take the semaphore here to guarantee that we won't be re-entered
1501 * while allocating the state structure, or while we request any IRQs
1502 * that the driver may need. This also has the nice side-effect that
1503 * it delays the action of uart_hangup, so we can guarantee that
1504 * state->port.tty will always contain something reasonable.
1506 if (mutex_lock_interruptible(&port
->mutex
)) {
1507 retval
= -ERESTARTSYS
;
1512 if (!state
->uart_port
|| state
->uart_port
->flags
& UPF_DEAD
) {
1518 * Once we set tty->driver_data here, we are guaranteed that
1519 * uart_close() will decrement the driver module use count.
1520 * Any failures from here onwards should not touch the count.
1522 tty
->driver_data
= state
;
1523 state
->uart_port
->state
= state
;
1524 tty
->low_latency
= (state
->uart_port
->flags
& UPF_LOW_LATENCY
) ? 1 : 0;
1525 tty_port_tty_set(port
, tty
);
1528 * If the port is in the middle of closing, bail out now.
1530 if (tty_hung_up_p(filp
)) {
1536 * Make sure the device is in D0 state.
1538 if (port
->count
== 1)
1539 uart_change_pm(state
, 0);
1542 * Start up the serial port.
1544 retval
= uart_startup(tty
, state
, 0);
1547 * If we succeeded, wait until the port is ready.
1549 mutex_unlock(&port
->mutex
);
1551 retval
= tty_port_block_til_ready(port
, tty
, filp
);
1557 mutex_unlock(&port
->mutex
);
1561 static const char *uart_type(struct uart_port
*port
)
1563 const char *str
= NULL
;
1565 if (port
->ops
->type
)
1566 str
= port
->ops
->type(port
);
1574 #ifdef CONFIG_PROC_FS
1576 static void uart_line_info(struct seq_file
*m
, struct uart_driver
*drv
, int i
)
1578 struct uart_state
*state
= drv
->state
+ i
;
1579 struct tty_port
*port
= &state
->port
;
1581 struct uart_port
*uport
= state
->uart_port
;
1583 unsigned int status
;
1589 mmio
= uport
->iotype
>= UPIO_MEM
;
1590 seq_printf(m
, "%d: uart:%s %s%08llX irq:%d",
1591 uport
->line
, uart_type(uport
),
1592 mmio
? "mmio:0x" : "port:",
1593 mmio
? (unsigned long long)uport
->mapbase
1594 : (unsigned long long)uport
->iobase
,
1597 if (uport
->type
== PORT_UNKNOWN
) {
1602 if (capable(CAP_SYS_ADMIN
)) {
1603 mutex_lock(&port
->mutex
);
1604 pm_state
= state
->pm_state
;
1606 uart_change_pm(state
, 0);
1607 spin_lock_irq(&uport
->lock
);
1608 status
= uport
->ops
->get_mctrl(uport
);
1609 spin_unlock_irq(&uport
->lock
);
1611 uart_change_pm(state
, pm_state
);
1612 mutex_unlock(&port
->mutex
);
1614 seq_printf(m
, " tx:%d rx:%d",
1615 uport
->icount
.tx
, uport
->icount
.rx
);
1616 if (uport
->icount
.frame
)
1617 seq_printf(m
, " fe:%d",
1618 uport
->icount
.frame
);
1619 if (uport
->icount
.parity
)
1620 seq_printf(m
, " pe:%d",
1621 uport
->icount
.parity
);
1622 if (uport
->icount
.brk
)
1623 seq_printf(m
, " brk:%d",
1625 if (uport
->icount
.overrun
)
1626 seq_printf(m
, " oe:%d",
1627 uport
->icount
.overrun
);
1629 #define INFOBIT(bit, str) \
1630 if (uport->mctrl & (bit)) \
1631 strncat(stat_buf, (str), sizeof(stat_buf) - \
1632 strlen(stat_buf) - 2)
1633 #define STATBIT(bit, str) \
1634 if (status & (bit)) \
1635 strncat(stat_buf, (str), sizeof(stat_buf) - \
1636 strlen(stat_buf) - 2)
1640 INFOBIT(TIOCM_RTS
, "|RTS");
1641 STATBIT(TIOCM_CTS
, "|CTS");
1642 INFOBIT(TIOCM_DTR
, "|DTR");
1643 STATBIT(TIOCM_DSR
, "|DSR");
1644 STATBIT(TIOCM_CAR
, "|CD");
1645 STATBIT(TIOCM_RNG
, "|RI");
1649 seq_puts(m
, stat_buf
);
1656 static int uart_proc_show(struct seq_file
*m
, void *v
)
1658 struct tty_driver
*ttydrv
= m
->private;
1659 struct uart_driver
*drv
= ttydrv
->driver_state
;
1662 seq_printf(m
, "serinfo:1.0 driver%s%s revision:%s\n",
1664 for (i
= 0; i
< drv
->nr
; i
++)
1665 uart_line_info(m
, drv
, i
);
1669 static int uart_proc_open(struct inode
*inode
, struct file
*file
)
1671 return single_open(file
, uart_proc_show
, PDE(inode
)->data
);
1674 static const struct file_operations uart_proc_fops
= {
1675 .owner
= THIS_MODULE
,
1676 .open
= uart_proc_open
,
1678 .llseek
= seq_lseek
,
1679 .release
= single_release
,
1683 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
1685 * uart_console_write - write a console message to a serial port
1686 * @port: the port to write the message
1687 * @s: array of characters
1688 * @count: number of characters in string to write
1689 * @write: function to write character to port
1691 void uart_console_write(struct uart_port
*port
, const char *s
,
1693 void (*putchar
)(struct uart_port
*, int))
1697 for (i
= 0; i
< count
; i
++, s
++) {
1699 putchar(port
, '\r');
1703 EXPORT_SYMBOL_GPL(uart_console_write
);
1706 * Check whether an invalid uart number has been specified, and
1707 * if so, search for the first available port that does have
1710 struct uart_port
* __init
1711 uart_get_console(struct uart_port
*ports
, int nr
, struct console
*co
)
1713 int idx
= co
->index
;
1715 if (idx
< 0 || idx
>= nr
|| (ports
[idx
].iobase
== 0 &&
1716 ports
[idx
].membase
== NULL
))
1717 for (idx
= 0; idx
< nr
; idx
++)
1718 if (ports
[idx
].iobase
!= 0 ||
1719 ports
[idx
].membase
!= NULL
)
1728 * uart_parse_options - Parse serial port baud/parity/bits/flow contro.
1729 * @options: pointer to option string
1730 * @baud: pointer to an 'int' variable for the baud rate.
1731 * @parity: pointer to an 'int' variable for the parity.
1732 * @bits: pointer to an 'int' variable for the number of data bits.
1733 * @flow: pointer to an 'int' variable for the flow control character.
1735 * uart_parse_options decodes a string containing the serial console
1736 * options. The format of the string is <baud><parity><bits><flow>,
1740 uart_parse_options(char *options
, int *baud
, int *parity
, int *bits
, int *flow
)
1744 *baud
= simple_strtoul(s
, NULL
, 10);
1745 while (*s
>= '0' && *s
<= '9')
1754 EXPORT_SYMBOL_GPL(uart_parse_options
);
1761 static const struct baud_rates baud_rates
[] = {
1762 { 921600, B921600
},
1763 { 460800, B460800
},
1764 { 230400, B230400
},
1765 { 115200, B115200
},
1777 * uart_set_options - setup the serial console parameters
1778 * @port: pointer to the serial ports uart_port structure
1779 * @co: console pointer
1781 * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even)
1782 * @bits: number of data bits
1783 * @flow: flow control character - 'r' (rts)
1786 uart_set_options(struct uart_port
*port
, struct console
*co
,
1787 int baud
, int parity
, int bits
, int flow
)
1789 struct ktermios termios
;
1790 static struct ktermios dummy
;
1794 * Ensure that the serial console lock is initialised
1797 spin_lock_init(&port
->lock
);
1798 lockdep_set_class(&port
->lock
, &port_lock_key
);
1800 memset(&termios
, 0, sizeof(struct ktermios
));
1802 termios
.c_cflag
= CREAD
| HUPCL
| CLOCAL
;
1805 * Construct a cflag setting.
1807 for (i
= 0; baud_rates
[i
].rate
; i
++)
1808 if (baud_rates
[i
].rate
<= baud
)
1811 termios
.c_cflag
|= baud_rates
[i
].cflag
;
1814 termios
.c_cflag
|= CS7
;
1816 termios
.c_cflag
|= CS8
;
1820 termios
.c_cflag
|= PARODD
;
1823 termios
.c_cflag
|= PARENB
;
1828 termios
.c_cflag
|= CRTSCTS
;
1831 * some uarts on other side don't support no flow control.
1832 * So we set * DTR in host uart to make them happy
1834 port
->mctrl
|= TIOCM_DTR
;
1836 port
->ops
->set_termios(port
, &termios
, &dummy
);
1838 * Allow the setting of the UART parameters with a NULL console
1842 co
->cflag
= termios
.c_cflag
;
1846 EXPORT_SYMBOL_GPL(uart_set_options
);
1847 #endif /* CONFIG_SERIAL_CORE_CONSOLE */
1850 * uart_change_pm - set power state of the port
1852 * @state: port descriptor
1853 * @pm_state: new state
1855 * Locking: port->mutex has to be held
1857 static void uart_change_pm(struct uart_state
*state
, int pm_state
)
1859 struct uart_port
*port
= state
->uart_port
;
1861 if (state
->pm_state
!= pm_state
) {
1863 port
->ops
->pm(port
, pm_state
, state
->pm_state
);
1864 state
->pm_state
= pm_state
;
1869 struct uart_port
*port
;
1870 struct uart_driver
*driver
;
1873 static int serial_match_port(struct device
*dev
, void *data
)
1875 struct uart_match
*match
= data
;
1876 struct tty_driver
*tty_drv
= match
->driver
->tty_driver
;
1877 dev_t devt
= MKDEV(tty_drv
->major
, tty_drv
->minor_start
) +
1880 return dev
->devt
== devt
; /* Actually, only one tty per port */
1883 int uart_suspend_port(struct uart_driver
*drv
, struct uart_port
*uport
)
1885 struct uart_state
*state
= drv
->state
+ uport
->line
;
1886 struct tty_port
*port
= &state
->port
;
1887 struct device
*tty_dev
;
1888 struct uart_match match
= {uport
, drv
};
1890 mutex_lock(&port
->mutex
);
1892 tty_dev
= device_find_child(uport
->dev
, &match
, serial_match_port
);
1893 if (device_may_wakeup(tty_dev
)) {
1894 if (!enable_irq_wake(uport
->irq
))
1895 uport
->irq_wake
= 1;
1896 put_device(tty_dev
);
1897 mutex_unlock(&port
->mutex
);
1900 if (console_suspend_enabled
|| !uart_console(uport
))
1901 uport
->suspended
= 1;
1903 if (port
->flags
& ASYNC_INITIALIZED
) {
1904 const struct uart_ops
*ops
= uport
->ops
;
1907 if (console_suspend_enabled
|| !uart_console(uport
)) {
1908 set_bit(ASYNCB_SUSPENDED
, &port
->flags
);
1909 clear_bit(ASYNCB_INITIALIZED
, &port
->flags
);
1911 spin_lock_irq(&uport
->lock
);
1912 ops
->stop_tx(uport
);
1913 ops
->set_mctrl(uport
, 0);
1914 ops
->stop_rx(uport
);
1915 spin_unlock_irq(&uport
->lock
);
1919 * Wait for the transmitter to empty.
1921 for (tries
= 3; !ops
->tx_empty(uport
) && tries
; tries
--)
1924 printk(KERN_ERR
"%s%s%s%d: Unable to drain "
1926 uport
->dev
? dev_name(uport
->dev
) : "",
1927 uport
->dev
? ": " : "",
1929 drv
->tty_driver
->name_base
+ uport
->line
);
1931 if (console_suspend_enabled
|| !uart_console(uport
))
1932 ops
->shutdown(uport
);
1936 * Disable the console device before suspending.
1938 if (console_suspend_enabled
&& uart_console(uport
))
1939 console_stop(uport
->cons
);
1941 if (console_suspend_enabled
|| !uart_console(uport
))
1942 uart_change_pm(state
, 3);
1944 mutex_unlock(&port
->mutex
);
1949 int uart_resume_port(struct uart_driver
*drv
, struct uart_port
*uport
)
1951 struct uart_state
*state
= drv
->state
+ uport
->line
;
1952 struct tty_port
*port
= &state
->port
;
1953 struct device
*tty_dev
;
1954 struct uart_match match
= {uport
, drv
};
1955 struct ktermios termios
;
1957 mutex_lock(&port
->mutex
);
1959 tty_dev
= device_find_child(uport
->dev
, &match
, serial_match_port
);
1960 if (!uport
->suspended
&& device_may_wakeup(tty_dev
)) {
1961 if (uport
->irq_wake
) {
1962 disable_irq_wake(uport
->irq
);
1963 uport
->irq_wake
= 0;
1965 mutex_unlock(&port
->mutex
);
1968 uport
->suspended
= 0;
1971 * Re-enable the console device after suspending.
1973 if (uart_console(uport
)) {
1975 * First try to use the console cflag setting.
1977 memset(&termios
, 0, sizeof(struct ktermios
));
1978 termios
.c_cflag
= uport
->cons
->cflag
;
1981 * If that's unset, use the tty termios setting.
1983 if (port
->tty
&& termios
.c_cflag
== 0)
1984 termios
= port
->tty
->termios
;
1986 if (console_suspend_enabled
)
1987 uart_change_pm(state
, 0);
1988 uport
->ops
->set_termios(uport
, &termios
, NULL
);
1989 if (console_suspend_enabled
)
1990 console_start(uport
->cons
);
1993 if (port
->flags
& ASYNC_SUSPENDED
) {
1994 const struct uart_ops
*ops
= uport
->ops
;
1997 uart_change_pm(state
, 0);
1998 spin_lock_irq(&uport
->lock
);
1999 ops
->set_mctrl(uport
, 0);
2000 spin_unlock_irq(&uport
->lock
);
2001 if (console_suspend_enabled
|| !uart_console(uport
)) {
2002 /* Protected by port mutex for now */
2003 struct tty_struct
*tty
= port
->tty
;
2004 ret
= ops
->startup(uport
);
2007 uart_change_speed(tty
, state
, NULL
);
2008 spin_lock_irq(&uport
->lock
);
2009 ops
->set_mctrl(uport
, uport
->mctrl
);
2010 ops
->start_tx(uport
);
2011 spin_unlock_irq(&uport
->lock
);
2012 set_bit(ASYNCB_INITIALIZED
, &port
->flags
);
2015 * Failed to resume - maybe hardware went away?
2016 * Clear the "initialized" flag so we won't try
2017 * to call the low level drivers shutdown method.
2019 uart_shutdown(tty
, state
);
2023 clear_bit(ASYNCB_SUSPENDED
, &port
->flags
);
2026 mutex_unlock(&port
->mutex
);
2032 uart_report_port(struct uart_driver
*drv
, struct uart_port
*port
)
2036 switch (port
->iotype
) {
2038 snprintf(address
, sizeof(address
), "I/O 0x%lx", port
->iobase
);
2041 snprintf(address
, sizeof(address
),
2042 "I/O 0x%lx offset 0x%x", port
->iobase
, port
->hub6
);
2048 snprintf(address
, sizeof(address
),
2049 "MMIO 0x%llx", (unsigned long long)port
->mapbase
);
2052 strlcpy(address
, "*unknown*", sizeof(address
));
2056 printk(KERN_INFO
"%s%s%s%d at %s (irq = %d) is a %s\n",
2057 port
->dev
? dev_name(port
->dev
) : "",
2058 port
->dev
? ": " : "",
2060 drv
->tty_driver
->name_base
+ port
->line
,
2061 address
, port
->irq
, uart_type(port
));
2065 uart_configure_port(struct uart_driver
*drv
, struct uart_state
*state
,
2066 struct uart_port
*port
)
2071 * If there isn't a port here, don't do anything further.
2073 if (!port
->iobase
&& !port
->mapbase
&& !port
->membase
)
2077 * Now do the auto configuration stuff. Note that config_port
2078 * is expected to claim the resources and map the port for us.
2081 if (port
->flags
& UPF_AUTO_IRQ
)
2082 flags
|= UART_CONFIG_IRQ
;
2083 if (port
->flags
& UPF_BOOT_AUTOCONF
) {
2084 if (!(port
->flags
& UPF_FIXED_TYPE
)) {
2085 port
->type
= PORT_UNKNOWN
;
2086 flags
|= UART_CONFIG_TYPE
;
2088 port
->ops
->config_port(port
, flags
);
2091 if (port
->type
!= PORT_UNKNOWN
) {
2092 unsigned long flags
;
2094 uart_report_port(drv
, port
);
2096 /* Power up port for set_mctrl() */
2097 uart_change_pm(state
, 0);
2100 * Ensure that the modem control lines are de-activated.
2101 * keep the DTR setting that is set in uart_set_options()
2102 * We probably don't need a spinlock around this, but
2104 spin_lock_irqsave(&port
->lock
, flags
);
2105 port
->ops
->set_mctrl(port
, port
->mctrl
& TIOCM_DTR
);
2106 spin_unlock_irqrestore(&port
->lock
, flags
);
2109 * If this driver supports console, and it hasn't been
2110 * successfully registered yet, try to re-register it.
2111 * It may be that the port was not available.
2113 if (port
->cons
&& !(port
->cons
->flags
& CON_ENABLED
))
2114 register_console(port
->cons
);
2117 * Power down all ports by default, except the
2118 * console if we have one.
2120 if (!uart_console(port
))
2121 uart_change_pm(state
, 3);
2125 #ifdef CONFIG_CONSOLE_POLL
2127 static int uart_poll_init(struct tty_driver
*driver
, int line
, char *options
)
2129 struct uart_driver
*drv
= driver
->driver_state
;
2130 struct uart_state
*state
= drv
->state
+ line
;
2131 struct uart_port
*port
;
2138 if (!state
|| !state
->uart_port
)
2141 port
= state
->uart_port
;
2142 if (!(port
->ops
->poll_get_char
&& port
->ops
->poll_put_char
))
2145 if (port
->ops
->poll_init
) {
2146 struct tty_port
*tport
= &state
->port
;
2149 mutex_lock(&tport
->mutex
);
2151 * We don't set ASYNCB_INITIALIZED as we only initialized the
2152 * hw, e.g. state->xmit is still uninitialized.
2154 if (!test_bit(ASYNCB_INITIALIZED
, &tport
->flags
))
2155 ret
= port
->ops
->poll_init(port
);
2156 mutex_unlock(&tport
->mutex
);
2162 uart_parse_options(options
, &baud
, &parity
, &bits
, &flow
);
2163 return uart_set_options(port
, NULL
, baud
, parity
, bits
, flow
);
2169 static int uart_poll_get_char(struct tty_driver
*driver
, int line
)
2171 struct uart_driver
*drv
= driver
->driver_state
;
2172 struct uart_state
*state
= drv
->state
+ line
;
2173 struct uart_port
*port
;
2175 if (!state
|| !state
->uart_port
)
2178 port
= state
->uart_port
;
2179 return port
->ops
->poll_get_char(port
);
2182 static void uart_poll_put_char(struct tty_driver
*driver
, int line
, char ch
)
2184 struct uart_driver
*drv
= driver
->driver_state
;
2185 struct uart_state
*state
= drv
->state
+ line
;
2186 struct uart_port
*port
;
2188 if (!state
|| !state
->uart_port
)
2191 port
= state
->uart_port
;
2192 port
->ops
->poll_put_char(port
, ch
);
2196 static const struct tty_operations uart_ops
= {
2198 .close
= uart_close
,
2199 .write
= uart_write
,
2200 .put_char
= uart_put_char
,
2201 .flush_chars
= uart_flush_chars
,
2202 .write_room
= uart_write_room
,
2203 .chars_in_buffer
= uart_chars_in_buffer
,
2204 .flush_buffer
= uart_flush_buffer
,
2205 .ioctl
= uart_ioctl
,
2206 .throttle
= uart_throttle
,
2207 .unthrottle
= uart_unthrottle
,
2208 .send_xchar
= uart_send_xchar
,
2209 .set_termios
= uart_set_termios
,
2210 .set_ldisc
= uart_set_ldisc
,
2212 .start
= uart_start
,
2213 .hangup
= uart_hangup
,
2214 .break_ctl
= uart_break_ctl
,
2215 .wait_until_sent
= uart_wait_until_sent
,
2216 #ifdef CONFIG_PROC_FS
2217 .proc_fops
= &uart_proc_fops
,
2219 .tiocmget
= uart_tiocmget
,
2220 .tiocmset
= uart_tiocmset
,
2221 .get_icount
= uart_get_icount
,
2222 #ifdef CONFIG_CONSOLE_POLL
2223 .poll_init
= uart_poll_init
,
2224 .poll_get_char
= uart_poll_get_char
,
2225 .poll_put_char
= uart_poll_put_char
,
2229 static const struct tty_port_operations uart_port_ops
= {
2230 .activate
= uart_port_activate
,
2231 .shutdown
= uart_port_shutdown
,
2232 .carrier_raised
= uart_carrier_raised
,
2233 .dtr_rts
= uart_dtr_rts
,
2237 * uart_register_driver - register a driver with the uart core layer
2238 * @drv: low level driver structure
2240 * Register a uart driver with the core driver. We in turn register
2241 * with the tty layer, and initialise the core driver per-port state.
2243 * We have a proc file in /proc/tty/driver which is named after the
2246 * drv->port should be NULL, and the per-port structures should be
2247 * registered using uart_add_one_port after this call has succeeded.
2249 int uart_register_driver(struct uart_driver
*drv
)
2251 struct tty_driver
*normal
;
2257 * Maybe we should be using a slab cache for this, especially if
2258 * we have a large number of ports to handle.
2260 drv
->state
= kzalloc(sizeof(struct uart_state
) * drv
->nr
, GFP_KERNEL
);
2264 normal
= alloc_tty_driver(drv
->nr
);
2268 drv
->tty_driver
= normal
;
2270 normal
->driver_name
= drv
->driver_name
;
2271 normal
->name
= drv
->dev_name
;
2272 normal
->major
= drv
->major
;
2273 normal
->minor_start
= drv
->minor
;
2274 normal
->type
= TTY_DRIVER_TYPE_SERIAL
;
2275 normal
->subtype
= SERIAL_TYPE_NORMAL
;
2276 normal
->init_termios
= tty_std_termios
;
2277 normal
->init_termios
.c_cflag
= B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
2278 normal
->init_termios
.c_ispeed
= normal
->init_termios
.c_ospeed
= 9600;
2279 normal
->flags
= TTY_DRIVER_REAL_RAW
| TTY_DRIVER_DYNAMIC_DEV
;
2280 normal
->driver_state
= drv
;
2281 tty_set_operations(normal
, &uart_ops
);
2284 * Initialise the UART state(s).
2286 for (i
= 0; i
< drv
->nr
; i
++) {
2287 struct uart_state
*state
= drv
->state
+ i
;
2288 struct tty_port
*port
= &state
->port
;
2290 tty_port_init(port
);
2291 port
->ops
= &uart_port_ops
;
2292 port
->close_delay
= HZ
/ 2; /* .5 seconds */
2293 port
->closing_wait
= 30 * HZ
;/* 30 seconds */
2296 retval
= tty_register_driver(normal
);
2300 put_tty_driver(normal
);
2308 * uart_unregister_driver - remove a driver from the uart core layer
2309 * @drv: low level driver structure
2311 * Remove all references to a driver from the core driver. The low
2312 * level driver must have removed all its ports via the
2313 * uart_remove_one_port() if it registered them with uart_add_one_port().
2314 * (ie, drv->port == NULL)
2316 void uart_unregister_driver(struct uart_driver
*drv
)
2318 struct tty_driver
*p
= drv
->tty_driver
;
2319 tty_unregister_driver(p
);
2323 drv
->tty_driver
= NULL
;
2326 struct tty_driver
*uart_console_device(struct console
*co
, int *index
)
2328 struct uart_driver
*p
= co
->data
;
2330 return p
->tty_driver
;
2333 static ssize_t
uart_get_attr_uartclk(struct device
*dev
,
2334 struct device_attribute
*attr
, char *buf
)
2336 struct serial_struct tmp
;
2337 struct tty_port
*port
= dev_get_drvdata(dev
);
2339 uart_get_info(port
, &tmp
);
2340 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.baud_base
* 16);
2343 static ssize_t
uart_get_attr_type(struct device
*dev
,
2344 struct device_attribute
*attr
, char *buf
)
2346 struct serial_struct tmp
;
2347 struct tty_port
*port
= dev_get_drvdata(dev
);
2349 uart_get_info(port
, &tmp
);
2350 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.type
);
2352 static ssize_t
uart_get_attr_line(struct device
*dev
,
2353 struct device_attribute
*attr
, char *buf
)
2355 struct serial_struct tmp
;
2356 struct tty_port
*port
= dev_get_drvdata(dev
);
2358 uart_get_info(port
, &tmp
);
2359 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.line
);
2362 static ssize_t
uart_get_attr_port(struct device
*dev
,
2363 struct device_attribute
*attr
, char *buf
)
2365 struct serial_struct tmp
;
2366 struct tty_port
*port
= dev_get_drvdata(dev
);
2368 uart_get_info(port
, &tmp
);
2369 return snprintf(buf
, PAGE_SIZE
, "0x%lX\n", (unsigned long)(tmp
.port
| (((unsigned long)tmp
.port_high
) << HIGH_BITS_OFFSET
)));
2372 static ssize_t
uart_get_attr_irq(struct device
*dev
,
2373 struct device_attribute
*attr
, char *buf
)
2375 struct serial_struct tmp
;
2376 struct tty_port
*port
= dev_get_drvdata(dev
);
2378 uart_get_info(port
, &tmp
);
2379 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.irq
);
2382 static ssize_t
uart_get_attr_flags(struct device
*dev
,
2383 struct device_attribute
*attr
, char *buf
)
2385 struct serial_struct tmp
;
2386 struct tty_port
*port
= dev_get_drvdata(dev
);
2388 uart_get_info(port
, &tmp
);
2389 return snprintf(buf
, PAGE_SIZE
, "0x%X\n", tmp
.flags
);
2392 static ssize_t
uart_get_attr_xmit_fifo_size(struct device
*dev
,
2393 struct device_attribute
*attr
, char *buf
)
2395 struct serial_struct tmp
;
2396 struct tty_port
*port
= dev_get_drvdata(dev
);
2398 uart_get_info(port
, &tmp
);
2399 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.xmit_fifo_size
);
2403 static ssize_t
uart_get_attr_close_delay(struct device
*dev
,
2404 struct device_attribute
*attr
, char *buf
)
2406 struct serial_struct tmp
;
2407 struct tty_port
*port
= dev_get_drvdata(dev
);
2409 uart_get_info(port
, &tmp
);
2410 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.close_delay
);
2414 static ssize_t
uart_get_attr_closing_wait(struct device
*dev
,
2415 struct device_attribute
*attr
, char *buf
)
2417 struct serial_struct tmp
;
2418 struct tty_port
*port
= dev_get_drvdata(dev
);
2420 uart_get_info(port
, &tmp
);
2421 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.closing_wait
);
2424 static ssize_t
uart_get_attr_custom_divisor(struct device
*dev
,
2425 struct device_attribute
*attr
, char *buf
)
2427 struct serial_struct tmp
;
2428 struct tty_port
*port
= dev_get_drvdata(dev
);
2430 uart_get_info(port
, &tmp
);
2431 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.custom_divisor
);
2434 static ssize_t
uart_get_attr_io_type(struct device
*dev
,
2435 struct device_attribute
*attr
, char *buf
)
2437 struct serial_struct tmp
;
2438 struct tty_port
*port
= dev_get_drvdata(dev
);
2440 uart_get_info(port
, &tmp
);
2441 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.io_type
);
2444 static ssize_t
uart_get_attr_iomem_base(struct device
*dev
,
2445 struct device_attribute
*attr
, char *buf
)
2447 struct serial_struct tmp
;
2448 struct tty_port
*port
= dev_get_drvdata(dev
);
2450 uart_get_info(port
, &tmp
);
2451 return snprintf(buf
, PAGE_SIZE
, "0x%lX\n", (unsigned long)tmp
.iomem_base
);
2454 static ssize_t
uart_get_attr_iomem_reg_shift(struct device
*dev
,
2455 struct device_attribute
*attr
, char *buf
)
2457 struct serial_struct tmp
;
2458 struct tty_port
*port
= dev_get_drvdata(dev
);
2460 uart_get_info(port
, &tmp
);
2461 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.iomem_reg_shift
);
2464 static DEVICE_ATTR(type
, S_IRUSR
| S_IRGRP
, uart_get_attr_type
, NULL
);
2465 static DEVICE_ATTR(line
, S_IRUSR
| S_IRGRP
, uart_get_attr_line
, NULL
);
2466 static DEVICE_ATTR(port
, S_IRUSR
| S_IRGRP
, uart_get_attr_port
, NULL
);
2467 static DEVICE_ATTR(irq
, S_IRUSR
| S_IRGRP
, uart_get_attr_irq
, NULL
);
2468 static DEVICE_ATTR(flags
, S_IRUSR
| S_IRGRP
, uart_get_attr_flags
, NULL
);
2469 static DEVICE_ATTR(xmit_fifo_size
, S_IRUSR
| S_IRGRP
, uart_get_attr_xmit_fifo_size
, NULL
);
2470 static DEVICE_ATTR(uartclk
, S_IRUSR
| S_IRGRP
, uart_get_attr_uartclk
, NULL
);
2471 static DEVICE_ATTR(close_delay
, S_IRUSR
| S_IRGRP
, uart_get_attr_close_delay
, NULL
);
2472 static DEVICE_ATTR(closing_wait
, S_IRUSR
| S_IRGRP
, uart_get_attr_closing_wait
, NULL
);
2473 static DEVICE_ATTR(custom_divisor
, S_IRUSR
| S_IRGRP
, uart_get_attr_custom_divisor
, NULL
);
2474 static DEVICE_ATTR(io_type
, S_IRUSR
| S_IRGRP
, uart_get_attr_io_type
, NULL
);
2475 static DEVICE_ATTR(iomem_base
, S_IRUSR
| S_IRGRP
, uart_get_attr_iomem_base
, NULL
);
2476 static DEVICE_ATTR(iomem_reg_shift
, S_IRUSR
| S_IRGRP
, uart_get_attr_iomem_reg_shift
, NULL
);
2478 static struct attribute
*tty_dev_attrs
[] = {
2479 &dev_attr_type
.attr
,
2480 &dev_attr_line
.attr
,
2481 &dev_attr_port
.attr
,
2483 &dev_attr_flags
.attr
,
2484 &dev_attr_xmit_fifo_size
.attr
,
2485 &dev_attr_uartclk
.attr
,
2486 &dev_attr_close_delay
.attr
,
2487 &dev_attr_closing_wait
.attr
,
2488 &dev_attr_custom_divisor
.attr
,
2489 &dev_attr_io_type
.attr
,
2490 &dev_attr_iomem_base
.attr
,
2491 &dev_attr_iomem_reg_shift
.attr
,
2495 static const struct attribute_group tty_dev_attr_group
= {
2496 .attrs
= tty_dev_attrs
,
2499 static const struct attribute_group
*tty_dev_attr_groups
[] = {
2500 &tty_dev_attr_group
,
2506 * uart_add_one_port - attach a driver-defined port structure
2507 * @drv: pointer to the uart low level driver structure for this port
2508 * @uport: uart port structure to use for this port.
2510 * This allows the driver to register its own uart_port structure
2511 * with the core driver. The main purpose is to allow the low
2512 * level uart drivers to expand uart_port, rather than having yet
2513 * more levels of structures.
2515 int uart_add_one_port(struct uart_driver
*drv
, struct uart_port
*uport
)
2517 struct uart_state
*state
;
2518 struct tty_port
*port
;
2520 struct device
*tty_dev
;
2522 BUG_ON(in_interrupt());
2524 if (uport
->line
>= drv
->nr
)
2527 state
= drv
->state
+ uport
->line
;
2528 port
= &state
->port
;
2530 mutex_lock(&port_mutex
);
2531 mutex_lock(&port
->mutex
);
2532 if (state
->uart_port
) {
2537 state
->uart_port
= uport
;
2538 state
->pm_state
= -1;
2540 uport
->cons
= drv
->cons
;
2541 uport
->state
= state
;
2544 * If this port is a console, then the spinlock is already
2547 if (!(uart_console(uport
) && (uport
->cons
->flags
& CON_ENABLED
))) {
2548 spin_lock_init(&uport
->lock
);
2549 lockdep_set_class(&uport
->lock
, &port_lock_key
);
2552 uart_configure_port(drv
, state
, uport
);
2555 * Register the port whether it's detected or not. This allows
2556 * setserial to be used to alter this ports parameters.
2558 tty_dev
= tty_port_register_device_attr(port
, drv
->tty_driver
,
2559 uport
->line
, uport
->dev
, port
, tty_dev_attr_groups
);
2560 if (likely(!IS_ERR(tty_dev
))) {
2561 device_set_wakeup_capable(tty_dev
, 1);
2563 printk(KERN_ERR
"Cannot register tty device on line %d\n",
2568 * Ensure UPF_DEAD is not set.
2570 uport
->flags
&= ~UPF_DEAD
;
2573 mutex_unlock(&port
->mutex
);
2574 mutex_unlock(&port_mutex
);
2580 * uart_remove_one_port - detach a driver defined port structure
2581 * @drv: pointer to the uart low level driver structure for this port
2582 * @uport: uart port structure for this port
2584 * This unhooks (and hangs up) the specified port structure from the
2585 * core driver. No further calls will be made to the low-level code
2588 int uart_remove_one_port(struct uart_driver
*drv
, struct uart_port
*uport
)
2590 struct uart_state
*state
= drv
->state
+ uport
->line
;
2591 struct tty_port
*port
= &state
->port
;
2593 BUG_ON(in_interrupt());
2595 if (state
->uart_port
!= uport
)
2596 printk(KERN_ALERT
"Removing wrong port: %p != %p\n",
2597 state
->uart_port
, uport
);
2599 mutex_lock(&port_mutex
);
2602 * Mark the port "dead" - this prevents any opens from
2603 * succeeding while we shut down the port.
2605 mutex_lock(&port
->mutex
);
2606 uport
->flags
|= UPF_DEAD
;
2607 mutex_unlock(&port
->mutex
);
2610 * Remove the devices from the tty layer
2612 tty_unregister_device(drv
->tty_driver
, uport
->line
);
2615 tty_vhangup(port
->tty
);
2618 * Free the port IO and memory resources, if any.
2620 if (uport
->type
!= PORT_UNKNOWN
)
2621 uport
->ops
->release_port(uport
);
2624 * Indicate that there isn't a port here anymore.
2626 uport
->type
= PORT_UNKNOWN
;
2628 state
->uart_port
= NULL
;
2629 mutex_unlock(&port_mutex
);
2635 * Are the two ports equivalent?
2637 int uart_match_port(struct uart_port
*port1
, struct uart_port
*port2
)
2639 if (port1
->iotype
!= port2
->iotype
)
2642 switch (port1
->iotype
) {
2644 return (port1
->iobase
== port2
->iobase
);
2646 return (port1
->iobase
== port2
->iobase
) &&
2647 (port1
->hub6
== port2
->hub6
);
2652 return (port1
->mapbase
== port2
->mapbase
);
2656 EXPORT_SYMBOL(uart_match_port
);
2659 * uart_handle_dcd_change - handle a change of carrier detect state
2660 * @uport: uart_port structure for the open port
2661 * @status: new carrier detect status, nonzero if active
2663 void uart_handle_dcd_change(struct uart_port
*uport
, unsigned int status
)
2665 struct uart_state
*state
= uport
->state
;
2666 struct tty_port
*port
= &state
->port
;
2667 struct tty_ldisc
*ld
= NULL
;
2668 struct pps_event_time ts
;
2669 struct tty_struct
*tty
= port
->tty
;
2672 ld
= tty_ldisc_ref(tty
);
2673 if (ld
&& ld
->ops
->dcd_change
)
2676 uport
->icount
.dcd
++;
2677 #ifdef CONFIG_HARD_PPS
2678 if ((uport
->flags
& UPF_HARDPPS_CD
) && status
)
2682 if (port
->flags
& ASYNC_CHECK_CD
) {
2684 wake_up_interruptible(&port
->open_wait
);
2689 if (ld
&& ld
->ops
->dcd_change
)
2690 ld
->ops
->dcd_change(tty
, status
, &ts
);
2692 tty_ldisc_deref(ld
);
2694 EXPORT_SYMBOL_GPL(uart_handle_dcd_change
);
2697 * uart_handle_cts_change - handle a change of clear-to-send state
2698 * @uport: uart_port structure for the open port
2699 * @status: new clear to send status, nonzero if active
2701 void uart_handle_cts_change(struct uart_port
*uport
, unsigned int status
)
2703 struct tty_port
*port
= &uport
->state
->port
;
2704 struct tty_struct
*tty
= port
->tty
;
2706 uport
->icount
.cts
++;
2708 if (tty_port_cts_enabled(port
)) {
2709 if (tty
->hw_stopped
) {
2711 tty
->hw_stopped
= 0;
2712 uport
->ops
->start_tx(uport
);
2713 uart_write_wakeup(uport
);
2717 tty
->hw_stopped
= 1;
2718 uport
->ops
->stop_tx(uport
);
2723 EXPORT_SYMBOL_GPL(uart_handle_cts_change
);
2726 * uart_insert_char - push a char to the uart layer
2728 * User is responsible to call tty_flip_buffer_push when they are done with
2731 * @port: corresponding port
2732 * @status: state of the serial port RX buffer (LSR for 8250)
2733 * @overrun: mask of overrun bits in @status
2734 * @ch: character to push
2735 * @flag: flag for the character (see TTY_NORMAL and friends)
2737 void uart_insert_char(struct uart_port
*port
, unsigned int status
,
2738 unsigned int overrun
, unsigned int ch
, unsigned int flag
)
2740 struct tty_struct
*tty
= port
->state
->port
.tty
;
2742 if ((status
& port
->ignore_status_mask
& ~overrun
) == 0)
2743 if (tty_insert_flip_char(tty
, ch
, flag
) == 0)
2744 ++port
->icount
.buf_overrun
;
2747 * Overrun is special. Since it's reported immediately,
2748 * it doesn't affect the current character.
2750 if (status
& ~port
->ignore_status_mask
& overrun
)
2751 if (tty_insert_flip_char(tty
, 0, TTY_OVERRUN
) == 0)
2752 ++port
->icount
.buf_overrun
;
2754 EXPORT_SYMBOL_GPL(uart_insert_char
);
2756 EXPORT_SYMBOL(uart_write_wakeup
);
2757 EXPORT_SYMBOL(uart_register_driver
);
2758 EXPORT_SYMBOL(uart_unregister_driver
);
2759 EXPORT_SYMBOL(uart_suspend_port
);
2760 EXPORT_SYMBOL(uart_resume_port
);
2761 EXPORT_SYMBOL(uart_add_one_port
);
2762 EXPORT_SYMBOL(uart_remove_one_port
);
2764 MODULE_DESCRIPTION("Serial driver core");
2765 MODULE_LICENSE("GPL");