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
,
63 enum uart_pm_state pm_state
);
65 static void uart_port_shutdown(struct tty_port
*port
);
68 * This routine is used by the interrupt handler to schedule processing in
69 * the software interrupt portion of the driver.
71 void uart_write_wakeup(struct uart_port
*port
)
73 struct uart_state
*state
= port
->state
;
75 * This means you called this function _after_ the port was
76 * closed. No cookie for you.
79 tty_wakeup(state
->port
.tty
);
82 static void uart_stop(struct tty_struct
*tty
)
84 struct uart_state
*state
= tty
->driver_data
;
85 struct uart_port
*port
= state
->uart_port
;
88 spin_lock_irqsave(&port
->lock
, flags
);
89 port
->ops
->stop_tx(port
);
90 spin_unlock_irqrestore(&port
->lock
, flags
);
93 static void __uart_start(struct tty_struct
*tty
)
95 struct uart_state
*state
= tty
->driver_data
;
96 struct uart_port
*port
= state
->uart_port
;
98 if (!uart_circ_empty(&state
->xmit
) && state
->xmit
.buf
&&
99 !tty
->stopped
&& !tty
->hw_stopped
)
100 port
->ops
->start_tx(port
);
103 static void uart_start(struct tty_struct
*tty
)
105 struct uart_state
*state
= tty
->driver_data
;
106 struct uart_port
*port
= state
->uart_port
;
109 spin_lock_irqsave(&port
->lock
, flags
);
111 spin_unlock_irqrestore(&port
->lock
, flags
);
115 uart_update_mctrl(struct uart_port
*port
, unsigned int set
, unsigned int clear
)
120 spin_lock_irqsave(&port
->lock
, flags
);
122 port
->mctrl
= (old
& ~clear
) | set
;
123 if (old
!= port
->mctrl
)
124 port
->ops
->set_mctrl(port
, port
->mctrl
);
125 spin_unlock_irqrestore(&port
->lock
, flags
);
128 #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0)
129 #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear)
132 * Startup the port. This will be called once per open. All calls
133 * will be serialised by the per-port mutex.
135 static int uart_port_startup(struct tty_struct
*tty
, struct uart_state
*state
,
138 struct uart_port
*uport
= state
->uart_port
;
139 struct tty_port
*port
= &state
->port
;
143 if (uport
->type
== PORT_UNKNOWN
)
147 * Initialise and allocate the transmit and temporary
150 if (!state
->xmit
.buf
) {
151 /* This is protected by the per port mutex */
152 page
= get_zeroed_page(GFP_KERNEL
);
156 state
->xmit
.buf
= (unsigned char *) page
;
157 uart_circ_clear(&state
->xmit
);
160 retval
= uport
->ops
->startup(uport
);
162 if (uart_console(uport
) && uport
->cons
->cflag
) {
163 tty
->termios
.c_cflag
= uport
->cons
->cflag
;
164 uport
->cons
->cflag
= 0;
167 * Initialise the hardware port settings.
169 uart_change_speed(tty
, state
, NULL
);
173 * Setup the RTS and DTR signals once the
174 * port is open and ready to respond.
176 if (tty
->termios
.c_cflag
& CBAUD
)
177 uart_set_mctrl(uport
, TIOCM_RTS
| TIOCM_DTR
);
180 if (tty_port_cts_enabled(port
)) {
181 spin_lock_irq(&uport
->lock
);
182 if (!(uport
->ops
->get_mctrl(uport
) & TIOCM_CTS
))
184 spin_unlock_irq(&uport
->lock
);
189 * This is to allow setserial on this port. People may want to set
190 * port/irq/type and then reconfigure the port properly if it failed
193 if (retval
&& capable(CAP_SYS_ADMIN
))
199 static int uart_startup(struct tty_struct
*tty
, struct uart_state
*state
,
202 struct tty_port
*port
= &state
->port
;
205 if (port
->flags
& ASYNC_INITIALIZED
)
209 * Set the TTY IO error marker - we will only clear this
210 * once we have successfully opened the port.
212 set_bit(TTY_IO_ERROR
, &tty
->flags
);
214 retval
= uart_port_startup(tty
, state
, init_hw
);
216 set_bit(ASYNCB_INITIALIZED
, &port
->flags
);
217 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
218 } else if (retval
> 0)
225 * This routine will shutdown a serial port; interrupts are disabled, and
226 * DTR is dropped if the hangup on close termio flag is on. Calls to
227 * uart_shutdown are serialised by the per-port semaphore.
229 static void uart_shutdown(struct tty_struct
*tty
, struct uart_state
*state
)
231 struct uart_port
*uport
= state
->uart_port
;
232 struct tty_port
*port
= &state
->port
;
235 * Set the TTY IO error marker
238 set_bit(TTY_IO_ERROR
, &tty
->flags
);
240 if (test_and_clear_bit(ASYNCB_INITIALIZED
, &port
->flags
)) {
242 * Turn off DTR and RTS early.
244 if (!tty
|| (tty
->termios
.c_cflag
& HUPCL
))
245 uart_clear_mctrl(uport
, TIOCM_DTR
| TIOCM_RTS
);
247 uart_port_shutdown(port
);
251 * It's possible for shutdown to be called after suspend if we get
252 * a DCD drop (hangup) at just the right time. Clear suspended bit so
253 * we don't try to resume a port that has been shutdown.
255 clear_bit(ASYNCB_SUSPENDED
, &port
->flags
);
258 * Free the transmit buffer page.
260 if (state
->xmit
.buf
) {
261 free_page((unsigned long)state
->xmit
.buf
);
262 state
->xmit
.buf
= NULL
;
267 * uart_update_timeout - update per-port FIFO timeout.
268 * @port: uart_port structure describing the port
269 * @cflag: termios cflag value
270 * @baud: speed of the port
272 * Set the port FIFO timeout value. The @cflag value should
273 * reflect the actual hardware settings.
276 uart_update_timeout(struct uart_port
*port
, unsigned int cflag
,
281 /* byte size and parity */
282 switch (cflag
& CSIZE
) {
303 * The total number of bits to be transmitted in the fifo.
305 bits
= bits
* port
->fifosize
;
308 * Figure the timeout to send the above number of bits.
309 * Add .02 seconds of slop
311 port
->timeout
= (HZ
* bits
) / baud
+ HZ
/50;
314 EXPORT_SYMBOL(uart_update_timeout
);
317 * uart_get_baud_rate - return baud rate for a particular port
318 * @port: uart_port structure describing the port in question.
319 * @termios: desired termios settings.
320 * @old: old termios (or NULL)
321 * @min: minimum acceptable baud rate
322 * @max: maximum acceptable baud rate
324 * Decode the termios structure into a numeric baud rate,
325 * taking account of the magic 38400 baud rate (with spd_*
326 * flags), and mapping the %B0 rate to 9600 baud.
328 * If the new baud rate is invalid, try the old termios setting.
329 * If it's still invalid, we try 9600 baud.
331 * Update the @termios structure to reflect the baud rate
332 * we're actually going to be using. Don't do this for the case
333 * where B0 is requested ("hang up").
336 uart_get_baud_rate(struct uart_port
*port
, struct ktermios
*termios
,
337 struct ktermios
*old
, unsigned int min
, unsigned int max
)
339 unsigned int try, baud
, altbaud
= 38400;
341 upf_t flags
= port
->flags
& UPF_SPD_MASK
;
343 if (flags
== UPF_SPD_HI
)
345 else if (flags
== UPF_SPD_VHI
)
347 else if (flags
== UPF_SPD_SHI
)
349 else if (flags
== UPF_SPD_WARP
)
352 for (try = 0; try < 2; try++) {
353 baud
= tty_termios_baud_rate(termios
);
356 * The spd_hi, spd_vhi, spd_shi, spd_warp kludge...
363 * Special case: B0 rate.
370 if (baud
>= min
&& baud
<= max
)
374 * Oops, the quotient was zero. Try again with
375 * the old baud rate if possible.
377 termios
->c_cflag
&= ~CBAUD
;
379 baud
= tty_termios_baud_rate(old
);
381 tty_termios_encode_baud_rate(termios
,
388 * As a last resort, if the range cannot be met then clip to
389 * the nearest chip supported rate.
393 tty_termios_encode_baud_rate(termios
,
396 tty_termios_encode_baud_rate(termios
,
400 /* Should never happen */
405 EXPORT_SYMBOL(uart_get_baud_rate
);
408 * uart_get_divisor - return uart clock divisor
409 * @port: uart_port structure describing the port.
410 * @baud: desired baud rate
412 * Calculate the uart clock divisor for the port.
415 uart_get_divisor(struct uart_port
*port
, unsigned int baud
)
420 * Old custom speed handling.
422 if (baud
== 38400 && (port
->flags
& UPF_SPD_MASK
) == UPF_SPD_CUST
)
423 quot
= port
->custom_divisor
;
425 quot
= DIV_ROUND_CLOSEST(port
->uartclk
, 16 * baud
);
430 EXPORT_SYMBOL(uart_get_divisor
);
432 /* FIXME: Consistent locking policy */
433 static void uart_change_speed(struct tty_struct
*tty
, struct uart_state
*state
,
434 struct ktermios
*old_termios
)
436 struct tty_port
*port
= &state
->port
;
437 struct uart_port
*uport
= state
->uart_port
;
438 struct ktermios
*termios
;
441 * If we have no tty, termios, or the port does not exist,
442 * then we can't set the parameters for this port.
444 if (!tty
|| uport
->type
== PORT_UNKNOWN
)
447 termios
= &tty
->termios
;
450 * Set flags based on termios cflag
452 if (termios
->c_cflag
& CRTSCTS
)
453 set_bit(ASYNCB_CTS_FLOW
, &port
->flags
);
455 clear_bit(ASYNCB_CTS_FLOW
, &port
->flags
);
457 if (termios
->c_cflag
& CLOCAL
)
458 clear_bit(ASYNCB_CHECK_CD
, &port
->flags
);
460 set_bit(ASYNCB_CHECK_CD
, &port
->flags
);
462 uport
->ops
->set_termios(uport
, termios
, old_termios
);
465 static inline int __uart_put_char(struct uart_port
*port
,
466 struct circ_buf
*circ
, unsigned char c
)
474 spin_lock_irqsave(&port
->lock
, flags
);
475 if (uart_circ_chars_free(circ
) != 0) {
476 circ
->buf
[circ
->head
] = c
;
477 circ
->head
= (circ
->head
+ 1) & (UART_XMIT_SIZE
- 1);
480 spin_unlock_irqrestore(&port
->lock
, flags
);
484 static int uart_put_char(struct tty_struct
*tty
, unsigned char ch
)
486 struct uart_state
*state
= tty
->driver_data
;
488 return __uart_put_char(state
->uart_port
, &state
->xmit
, ch
);
491 static void uart_flush_chars(struct tty_struct
*tty
)
496 static int uart_write(struct tty_struct
*tty
,
497 const unsigned char *buf
, int count
)
499 struct uart_state
*state
= tty
->driver_data
;
500 struct uart_port
*port
;
501 struct circ_buf
*circ
;
506 * This means you called this function _after_ the port was
507 * closed. No cookie for you.
514 port
= state
->uart_port
;
520 spin_lock_irqsave(&port
->lock
, flags
);
522 c
= CIRC_SPACE_TO_END(circ
->head
, circ
->tail
, UART_XMIT_SIZE
);
527 memcpy(circ
->buf
+ circ
->head
, buf
, c
);
528 circ
->head
= (circ
->head
+ c
) & (UART_XMIT_SIZE
- 1);
533 spin_unlock_irqrestore(&port
->lock
, flags
);
539 static int uart_write_room(struct tty_struct
*tty
)
541 struct uart_state
*state
= tty
->driver_data
;
545 spin_lock_irqsave(&state
->uart_port
->lock
, flags
);
546 ret
= uart_circ_chars_free(&state
->xmit
);
547 spin_unlock_irqrestore(&state
->uart_port
->lock
, flags
);
551 static int uart_chars_in_buffer(struct tty_struct
*tty
)
553 struct uart_state
*state
= tty
->driver_data
;
557 spin_lock_irqsave(&state
->uart_port
->lock
, flags
);
558 ret
= uart_circ_chars_pending(&state
->xmit
);
559 spin_unlock_irqrestore(&state
->uart_port
->lock
, flags
);
563 static void uart_flush_buffer(struct tty_struct
*tty
)
565 struct uart_state
*state
= tty
->driver_data
;
566 struct uart_port
*port
;
570 * This means you called this function _after_ the port was
571 * closed. No cookie for you.
578 port
= state
->uart_port
;
579 pr_debug("uart_flush_buffer(%d) called\n", tty
->index
);
581 spin_lock_irqsave(&port
->lock
, flags
);
582 uart_circ_clear(&state
->xmit
);
583 if (port
->ops
->flush_buffer
)
584 port
->ops
->flush_buffer(port
);
585 spin_unlock_irqrestore(&port
->lock
, flags
);
590 * This function is used to send a high-priority XON/XOFF character to
593 static void uart_send_xchar(struct tty_struct
*tty
, char ch
)
595 struct uart_state
*state
= tty
->driver_data
;
596 struct uart_port
*port
= state
->uart_port
;
599 if (port
->ops
->send_xchar
)
600 port
->ops
->send_xchar(port
, ch
);
604 spin_lock_irqsave(&port
->lock
, flags
);
605 port
->ops
->start_tx(port
);
606 spin_unlock_irqrestore(&port
->lock
, flags
);
611 static void uart_throttle(struct tty_struct
*tty
)
613 struct uart_state
*state
= tty
->driver_data
;
614 struct uart_port
*port
= state
->uart_port
;
618 mask
|= UPF_SOFT_FLOW
;
619 if (tty
->termios
.c_cflag
& CRTSCTS
)
620 mask
|= UPF_HARD_FLOW
;
622 if (port
->flags
& mask
) {
623 port
->ops
->throttle(port
);
624 mask
&= ~port
->flags
;
627 if (mask
& UPF_SOFT_FLOW
)
628 uart_send_xchar(tty
, STOP_CHAR(tty
));
630 if (mask
& UPF_HARD_FLOW
)
631 uart_clear_mctrl(port
, TIOCM_RTS
);
634 static void uart_unthrottle(struct tty_struct
*tty
)
636 struct uart_state
*state
= tty
->driver_data
;
637 struct uart_port
*port
= state
->uart_port
;
641 mask
|= UPF_SOFT_FLOW
;
642 if (tty
->termios
.c_cflag
& CRTSCTS
)
643 mask
|= UPF_HARD_FLOW
;
645 if (port
->flags
& mask
) {
646 port
->ops
->unthrottle(port
);
647 mask
&= ~port
->flags
;
650 if (mask
& UPF_SOFT_FLOW
) {
654 uart_send_xchar(tty
, START_CHAR(tty
));
657 if (mask
& UPF_HARD_FLOW
)
658 uart_set_mctrl(port
, TIOCM_RTS
);
661 static void do_uart_get_info(struct tty_port
*port
,
662 struct serial_struct
*retinfo
)
664 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
665 struct uart_port
*uport
= state
->uart_port
;
667 memset(retinfo
, 0, sizeof(*retinfo
));
669 retinfo
->type
= uport
->type
;
670 retinfo
->line
= uport
->line
;
671 retinfo
->port
= uport
->iobase
;
672 if (HIGH_BITS_OFFSET
)
673 retinfo
->port_high
= (long) uport
->iobase
>> HIGH_BITS_OFFSET
;
674 retinfo
->irq
= uport
->irq
;
675 retinfo
->flags
= uport
->flags
;
676 retinfo
->xmit_fifo_size
= uport
->fifosize
;
677 retinfo
->baud_base
= uport
->uartclk
/ 16;
678 retinfo
->close_delay
= jiffies_to_msecs(port
->close_delay
) / 10;
679 retinfo
->closing_wait
= port
->closing_wait
== ASYNC_CLOSING_WAIT_NONE
?
680 ASYNC_CLOSING_WAIT_NONE
:
681 jiffies_to_msecs(port
->closing_wait
) / 10;
682 retinfo
->custom_divisor
= uport
->custom_divisor
;
683 retinfo
->hub6
= uport
->hub6
;
684 retinfo
->io_type
= uport
->iotype
;
685 retinfo
->iomem_reg_shift
= uport
->regshift
;
686 retinfo
->iomem_base
= (void *)(unsigned long)uport
->mapbase
;
689 static void uart_get_info(struct tty_port
*port
,
690 struct serial_struct
*retinfo
)
692 /* Ensure the state we copy is consistent and no hardware changes
694 mutex_lock(&port
->mutex
);
695 do_uart_get_info(port
, retinfo
);
696 mutex_unlock(&port
->mutex
);
699 static int uart_get_info_user(struct tty_port
*port
,
700 struct serial_struct __user
*retinfo
)
702 struct serial_struct tmp
;
703 uart_get_info(port
, &tmp
);
705 if (copy_to_user(retinfo
, &tmp
, sizeof(*retinfo
)))
710 static int uart_set_info(struct tty_struct
*tty
, struct tty_port
*port
,
711 struct uart_state
*state
,
712 struct serial_struct
*new_info
)
714 struct uart_port
*uport
= state
->uart_port
;
715 unsigned long new_port
;
716 unsigned int change_irq
, change_port
, closing_wait
;
717 unsigned int old_custom_divisor
, close_delay
;
718 upf_t old_flags
, new_flags
;
721 new_port
= new_info
->port
;
722 if (HIGH_BITS_OFFSET
)
723 new_port
+= (unsigned long) new_info
->port_high
<< HIGH_BITS_OFFSET
;
725 new_info
->irq
= irq_canonicalize(new_info
->irq
);
726 close_delay
= msecs_to_jiffies(new_info
->close_delay
* 10);
727 closing_wait
= new_info
->closing_wait
== ASYNC_CLOSING_WAIT_NONE
?
728 ASYNC_CLOSING_WAIT_NONE
:
729 msecs_to_jiffies(new_info
->closing_wait
* 10);
732 change_irq
= !(uport
->flags
& UPF_FIXED_PORT
)
733 && new_info
->irq
!= uport
->irq
;
736 * Since changing the 'type' of the port changes its resource
737 * allocations, we should treat type changes the same as
740 change_port
= !(uport
->flags
& UPF_FIXED_PORT
)
741 && (new_port
!= uport
->iobase
||
742 (unsigned long)new_info
->iomem_base
!= uport
->mapbase
||
743 new_info
->hub6
!= uport
->hub6
||
744 new_info
->io_type
!= uport
->iotype
||
745 new_info
->iomem_reg_shift
!= uport
->regshift
||
746 new_info
->type
!= uport
->type
);
748 old_flags
= uport
->flags
;
749 new_flags
= new_info
->flags
;
750 old_custom_divisor
= uport
->custom_divisor
;
752 if (!capable(CAP_SYS_ADMIN
)) {
754 if (change_irq
|| change_port
||
755 (new_info
->baud_base
!= uport
->uartclk
/ 16) ||
756 (close_delay
!= port
->close_delay
) ||
757 (closing_wait
!= port
->closing_wait
) ||
758 (new_info
->xmit_fifo_size
&&
759 new_info
->xmit_fifo_size
!= uport
->fifosize
) ||
760 (((new_flags
^ old_flags
) & ~UPF_USR_MASK
) != 0))
762 uport
->flags
= ((uport
->flags
& ~UPF_USR_MASK
) |
763 (new_flags
& UPF_USR_MASK
));
764 uport
->custom_divisor
= new_info
->custom_divisor
;
769 * Ask the low level driver to verify the settings.
771 if (uport
->ops
->verify_port
)
772 retval
= uport
->ops
->verify_port(uport
, new_info
);
774 if ((new_info
->irq
>= nr_irqs
) || (new_info
->irq
< 0) ||
775 (new_info
->baud_base
< 9600))
781 if (change_port
|| change_irq
) {
785 * Make sure that we are the sole user of this port.
787 if (tty_port_users(port
) > 1)
791 * We need to shutdown the serial port at the old
792 * port/type/irq combination.
794 uart_shutdown(tty
, state
);
798 unsigned long old_iobase
, old_mapbase
;
799 unsigned int old_type
, old_iotype
, old_hub6
, old_shift
;
801 old_iobase
= uport
->iobase
;
802 old_mapbase
= uport
->mapbase
;
803 old_type
= uport
->type
;
804 old_hub6
= uport
->hub6
;
805 old_iotype
= uport
->iotype
;
806 old_shift
= uport
->regshift
;
809 * Free and release old regions
811 if (old_type
!= PORT_UNKNOWN
)
812 uport
->ops
->release_port(uport
);
814 uport
->iobase
= new_port
;
815 uport
->type
= new_info
->type
;
816 uport
->hub6
= new_info
->hub6
;
817 uport
->iotype
= new_info
->io_type
;
818 uport
->regshift
= new_info
->iomem_reg_shift
;
819 uport
->mapbase
= (unsigned long)new_info
->iomem_base
;
822 * Claim and map the new regions
824 if (uport
->type
!= PORT_UNKNOWN
) {
825 retval
= uport
->ops
->request_port(uport
);
827 /* Always success - Jean II */
832 * If we fail to request resources for the
833 * new port, try to restore the old settings.
835 if (retval
&& old_type
!= PORT_UNKNOWN
) {
836 uport
->iobase
= old_iobase
;
837 uport
->type
= old_type
;
838 uport
->hub6
= old_hub6
;
839 uport
->iotype
= old_iotype
;
840 uport
->regshift
= old_shift
;
841 uport
->mapbase
= old_mapbase
;
842 retval
= uport
->ops
->request_port(uport
);
844 * If we failed to restore the old settings,
848 uport
->type
= PORT_UNKNOWN
;
854 /* Added to return the correct error -Ram Gupta */
860 uport
->irq
= new_info
->irq
;
861 if (!(uport
->flags
& UPF_FIXED_PORT
))
862 uport
->uartclk
= new_info
->baud_base
* 16;
863 uport
->flags
= (uport
->flags
& ~UPF_CHANGE_MASK
) |
864 (new_flags
& UPF_CHANGE_MASK
);
865 uport
->custom_divisor
= new_info
->custom_divisor
;
866 port
->close_delay
= close_delay
;
867 port
->closing_wait
= closing_wait
;
868 if (new_info
->xmit_fifo_size
)
869 uport
->fifosize
= new_info
->xmit_fifo_size
;
870 port
->low_latency
= (uport
->flags
& UPF_LOW_LATENCY
) ? 1 : 0;
874 if (uport
->type
== PORT_UNKNOWN
)
876 if (port
->flags
& ASYNC_INITIALIZED
) {
877 if (((old_flags
^ uport
->flags
) & UPF_SPD_MASK
) ||
878 old_custom_divisor
!= uport
->custom_divisor
) {
880 * If they're setting up a custom divisor or speed,
881 * instead of clearing it, then bitch about it. No
882 * need to rate-limit; it's CAP_SYS_ADMIN only.
884 if (uport
->flags
& UPF_SPD_MASK
) {
887 "%s sets custom speed on %s. This "
888 "is deprecated.\n", current
->comm
,
889 tty_name(port
->tty
, buf
));
891 uart_change_speed(tty
, state
, NULL
);
894 retval
= uart_startup(tty
, state
, 1);
899 static int uart_set_info_user(struct tty_struct
*tty
, struct uart_state
*state
,
900 struct serial_struct __user
*newinfo
)
902 struct serial_struct new_serial
;
903 struct tty_port
*port
= &state
->port
;
906 if (copy_from_user(&new_serial
, newinfo
, sizeof(new_serial
)))
910 * This semaphore protects port->count. It is also
911 * very useful to prevent opens. Also, take the
912 * port configuration semaphore to make sure that a
913 * module insertion/removal doesn't change anything
916 mutex_lock(&port
->mutex
);
917 retval
= uart_set_info(tty
, port
, state
, &new_serial
);
918 mutex_unlock(&port
->mutex
);
923 * uart_get_lsr_info - get line status register info
924 * @tty: tty associated with the UART
925 * @state: UART being queried
926 * @value: returned modem value
928 * Note: uart_ioctl protects us against hangups.
930 static int uart_get_lsr_info(struct tty_struct
*tty
,
931 struct uart_state
*state
, unsigned int __user
*value
)
933 struct uart_port
*uport
= state
->uart_port
;
936 result
= uport
->ops
->tx_empty(uport
);
939 * If we're about to load something into the transmit
940 * register, we'll pretend the transmitter isn't empty to
941 * avoid a race condition (depending on when the transmit
942 * interrupt happens).
945 ((uart_circ_chars_pending(&state
->xmit
) > 0) &&
946 !tty
->stopped
&& !tty
->hw_stopped
))
947 result
&= ~TIOCSER_TEMT
;
949 return put_user(result
, value
);
952 static int uart_tiocmget(struct tty_struct
*tty
)
954 struct uart_state
*state
= tty
->driver_data
;
955 struct tty_port
*port
= &state
->port
;
956 struct uart_port
*uport
= state
->uart_port
;
959 mutex_lock(&port
->mutex
);
960 if (!(tty
->flags
& (1 << TTY_IO_ERROR
))) {
961 result
= uport
->mctrl
;
962 spin_lock_irq(&uport
->lock
);
963 result
|= uport
->ops
->get_mctrl(uport
);
964 spin_unlock_irq(&uport
->lock
);
966 mutex_unlock(&port
->mutex
);
972 uart_tiocmset(struct tty_struct
*tty
, unsigned int set
, unsigned int clear
)
974 struct uart_state
*state
= tty
->driver_data
;
975 struct uart_port
*uport
= state
->uart_port
;
976 struct tty_port
*port
= &state
->port
;
979 mutex_lock(&port
->mutex
);
980 if (!(tty
->flags
& (1 << TTY_IO_ERROR
))) {
981 uart_update_mctrl(uport
, set
, clear
);
984 mutex_unlock(&port
->mutex
);
988 static int uart_break_ctl(struct tty_struct
*tty
, int break_state
)
990 struct uart_state
*state
= tty
->driver_data
;
991 struct tty_port
*port
= &state
->port
;
992 struct uart_port
*uport
= state
->uart_port
;
994 mutex_lock(&port
->mutex
);
996 if (uport
->type
!= PORT_UNKNOWN
)
997 uport
->ops
->break_ctl(uport
, break_state
);
999 mutex_unlock(&port
->mutex
);
1003 static int uart_do_autoconfig(struct tty_struct
*tty
,struct uart_state
*state
)
1005 struct uart_port
*uport
= state
->uart_port
;
1006 struct tty_port
*port
= &state
->port
;
1009 if (!capable(CAP_SYS_ADMIN
))
1013 * Take the per-port semaphore. This prevents count from
1014 * changing, and hence any extra opens of the port while
1015 * we're auto-configuring.
1017 if (mutex_lock_interruptible(&port
->mutex
))
1018 return -ERESTARTSYS
;
1021 if (tty_port_users(port
) == 1) {
1022 uart_shutdown(tty
, state
);
1025 * If we already have a port type configured,
1026 * we must release its resources.
1028 if (uport
->type
!= PORT_UNKNOWN
)
1029 uport
->ops
->release_port(uport
);
1031 flags
= UART_CONFIG_TYPE
;
1032 if (uport
->flags
& UPF_AUTO_IRQ
)
1033 flags
|= UART_CONFIG_IRQ
;
1036 * This will claim the ports resources if
1039 uport
->ops
->config_port(uport
, flags
);
1041 ret
= uart_startup(tty
, state
, 1);
1043 mutex_unlock(&port
->mutex
);
1048 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1049 * - mask passed in arg for lines of interest
1050 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1051 * Caller should use TIOCGICOUNT to see which one it was
1053 * FIXME: This wants extracting into a common all driver implementation
1054 * of TIOCMWAIT using tty_port.
1057 uart_wait_modem_status(struct uart_state
*state
, unsigned long arg
)
1059 struct uart_port
*uport
= state
->uart_port
;
1060 struct tty_port
*port
= &state
->port
;
1061 DECLARE_WAITQUEUE(wait
, current
);
1062 struct uart_icount cprev
, cnow
;
1066 * note the counters on entry
1068 spin_lock_irq(&uport
->lock
);
1069 memcpy(&cprev
, &uport
->icount
, sizeof(struct uart_icount
));
1072 * Force modem status interrupts on
1074 uport
->ops
->enable_ms(uport
);
1075 spin_unlock_irq(&uport
->lock
);
1077 add_wait_queue(&port
->delta_msr_wait
, &wait
);
1079 spin_lock_irq(&uport
->lock
);
1080 memcpy(&cnow
, &uport
->icount
, sizeof(struct uart_icount
));
1081 spin_unlock_irq(&uport
->lock
);
1083 set_current_state(TASK_INTERRUPTIBLE
);
1085 if (((arg
& TIOCM_RNG
) && (cnow
.rng
!= cprev
.rng
)) ||
1086 ((arg
& TIOCM_DSR
) && (cnow
.dsr
!= cprev
.dsr
)) ||
1087 ((arg
& TIOCM_CD
) && (cnow
.dcd
!= cprev
.dcd
)) ||
1088 ((arg
& TIOCM_CTS
) && (cnow
.cts
!= cprev
.cts
))) {
1095 /* see if a signal did it */
1096 if (signal_pending(current
)) {
1104 current
->state
= TASK_RUNNING
;
1105 remove_wait_queue(&port
->delta_msr_wait
, &wait
);
1111 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1112 * Return: write counters to the user passed counter struct
1113 * NB: both 1->0 and 0->1 transitions are counted except for
1114 * RI where only 0->1 is counted.
1116 static int uart_get_icount(struct tty_struct
*tty
,
1117 struct serial_icounter_struct
*icount
)
1119 struct uart_state
*state
= tty
->driver_data
;
1120 struct uart_icount cnow
;
1121 struct uart_port
*uport
= state
->uart_port
;
1123 spin_lock_irq(&uport
->lock
);
1124 memcpy(&cnow
, &uport
->icount
, sizeof(struct uart_icount
));
1125 spin_unlock_irq(&uport
->lock
);
1127 icount
->cts
= cnow
.cts
;
1128 icount
->dsr
= cnow
.dsr
;
1129 icount
->rng
= cnow
.rng
;
1130 icount
->dcd
= cnow
.dcd
;
1131 icount
->rx
= cnow
.rx
;
1132 icount
->tx
= cnow
.tx
;
1133 icount
->frame
= cnow
.frame
;
1134 icount
->overrun
= cnow
.overrun
;
1135 icount
->parity
= cnow
.parity
;
1136 icount
->brk
= cnow
.brk
;
1137 icount
->buf_overrun
= cnow
.buf_overrun
;
1143 * Called via sys_ioctl. We can use spin_lock_irq() here.
1146 uart_ioctl(struct tty_struct
*tty
, unsigned int cmd
,
1149 struct uart_state
*state
= tty
->driver_data
;
1150 struct tty_port
*port
= &state
->port
;
1151 void __user
*uarg
= (void __user
*)arg
;
1152 int ret
= -ENOIOCTLCMD
;
1156 * These ioctls don't rely on the hardware to be present.
1160 ret
= uart_get_info_user(port
, uarg
);
1164 ret
= uart_set_info_user(tty
, state
, uarg
);
1168 ret
= uart_do_autoconfig(tty
, state
);
1171 case TIOCSERGWILD
: /* obsolete */
1172 case TIOCSERSWILD
: /* obsolete */
1177 if (ret
!= -ENOIOCTLCMD
)
1180 if (tty
->flags
& (1 << TTY_IO_ERROR
)) {
1186 * The following should only be used when hardware is present.
1190 ret
= uart_wait_modem_status(state
, arg
);
1194 if (ret
!= -ENOIOCTLCMD
)
1197 mutex_lock(&port
->mutex
);
1199 if (tty
->flags
& (1 << TTY_IO_ERROR
)) {
1205 * All these rely on hardware being present and need to be
1206 * protected against the tty being hung up.
1209 case TIOCSERGETLSR
: /* Get line status register */
1210 ret
= uart_get_lsr_info(tty
, state
, uarg
);
1214 struct uart_port
*uport
= state
->uart_port
;
1215 if (uport
->ops
->ioctl
)
1216 ret
= uport
->ops
->ioctl(uport
, cmd
, arg
);
1221 mutex_unlock(&port
->mutex
);
1226 static void uart_set_ldisc(struct tty_struct
*tty
)
1228 struct uart_state
*state
= tty
->driver_data
;
1229 struct uart_port
*uport
= state
->uart_port
;
1231 if (uport
->ops
->set_ldisc
)
1232 uport
->ops
->set_ldisc(uport
, tty
->termios
.c_line
);
1235 static void uart_set_termios(struct tty_struct
*tty
,
1236 struct ktermios
*old_termios
)
1238 struct uart_state
*state
= tty
->driver_data
;
1239 struct uart_port
*uport
= state
->uart_port
;
1240 unsigned long flags
;
1241 unsigned int cflag
= tty
->termios
.c_cflag
;
1242 unsigned int iflag_mask
= IGNBRK
|BRKINT
|IGNPAR
|PARMRK
|INPCK
;
1243 bool sw_changed
= false;
1246 * Drivers doing software flow control also need to know
1247 * about changes to these input settings.
1249 if (uport
->flags
& UPF_SOFT_FLOW
) {
1250 iflag_mask
|= IXANY
|IXON
|IXOFF
;
1252 tty
->termios
.c_cc
[VSTART
] != old_termios
->c_cc
[VSTART
] ||
1253 tty
->termios
.c_cc
[VSTOP
] != old_termios
->c_cc
[VSTOP
];
1257 * These are the bits that are used to setup various
1258 * flags in the low level driver. We can ignore the Bfoo
1259 * bits in c_cflag; c_[io]speed will always be set
1260 * appropriately by set_termios() in tty_ioctl.c
1262 if ((cflag
^ old_termios
->c_cflag
) == 0 &&
1263 tty
->termios
.c_ospeed
== old_termios
->c_ospeed
&&
1264 tty
->termios
.c_ispeed
== old_termios
->c_ispeed
&&
1265 ((tty
->termios
.c_iflag
^ old_termios
->c_iflag
) & iflag_mask
) == 0 &&
1270 uart_change_speed(tty
, state
, old_termios
);
1272 /* Handle transition to B0 status */
1273 if ((old_termios
->c_cflag
& CBAUD
) && !(cflag
& CBAUD
))
1274 uart_clear_mctrl(uport
, TIOCM_RTS
| TIOCM_DTR
);
1275 /* Handle transition away from B0 status */
1276 else if (!(old_termios
->c_cflag
& CBAUD
) && (cflag
& CBAUD
)) {
1277 unsigned int mask
= TIOCM_DTR
;
1278 if (!(cflag
& CRTSCTS
) ||
1279 !test_bit(TTY_THROTTLED
, &tty
->flags
))
1281 uart_set_mctrl(uport
, mask
);
1285 * If the port is doing h/w assisted flow control, do nothing.
1286 * We assume that tty->hw_stopped has never been set.
1288 if (uport
->flags
& UPF_HARD_FLOW
)
1291 /* Handle turning off CRTSCTS */
1292 if ((old_termios
->c_cflag
& CRTSCTS
) && !(cflag
& CRTSCTS
)) {
1293 spin_lock_irqsave(&uport
->lock
, flags
);
1294 tty
->hw_stopped
= 0;
1296 spin_unlock_irqrestore(&uport
->lock
, flags
);
1298 /* Handle turning on CRTSCTS */
1299 else if (!(old_termios
->c_cflag
& CRTSCTS
) && (cflag
& CRTSCTS
)) {
1300 spin_lock_irqsave(&uport
->lock
, flags
);
1301 if (!(uport
->ops
->get_mctrl(uport
) & TIOCM_CTS
)) {
1302 tty
->hw_stopped
= 1;
1303 uport
->ops
->stop_tx(uport
);
1305 spin_unlock_irqrestore(&uport
->lock
, flags
);
1310 * Calls to uart_close() are serialised via the tty_lock in
1311 * drivers/tty/tty_io.c:tty_release()
1312 * drivers/tty/tty_io.c:do_tty_hangup()
1313 * This runs from a workqueue and can sleep for a _short_ time only.
1315 static void uart_close(struct tty_struct
*tty
, struct file
*filp
)
1317 struct uart_state
*state
= tty
->driver_data
;
1318 struct tty_port
*port
;
1319 struct uart_port
*uport
;
1320 unsigned long flags
;
1325 uport
= state
->uart_port
;
1326 port
= &state
->port
;
1328 pr_debug("uart_close(%d) called\n", uport
->line
);
1330 if (tty_port_close_start(port
, tty
, filp
) == 0)
1334 * At this point, we stop accepting input. To do this, we
1335 * disable the receive line status interrupts.
1337 if (port
->flags
& ASYNC_INITIALIZED
) {
1338 unsigned long flags
;
1339 spin_lock_irqsave(&uport
->lock
, flags
);
1340 uport
->ops
->stop_rx(uport
);
1341 spin_unlock_irqrestore(&uport
->lock
, flags
);
1343 * Before we drop DTR, make sure the UART transmitter
1344 * has completely drained; this is especially
1345 * important if there is a transmit FIFO!
1347 uart_wait_until_sent(tty
, uport
->timeout
);
1350 mutex_lock(&port
->mutex
);
1351 uart_shutdown(tty
, state
);
1352 uart_flush_buffer(tty
);
1354 tty_ldisc_flush(tty
);
1356 tty_port_tty_set(port
, NULL
);
1357 spin_lock_irqsave(&port
->lock
, flags
);
1360 if (port
->blocked_open
) {
1361 spin_unlock_irqrestore(&port
->lock
, flags
);
1362 if (port
->close_delay
)
1363 msleep_interruptible(
1364 jiffies_to_msecs(port
->close_delay
));
1365 spin_lock_irqsave(&port
->lock
, flags
);
1366 } else if (!uart_console(uport
)) {
1367 spin_unlock_irqrestore(&port
->lock
, flags
);
1368 uart_change_pm(state
, UART_PM_STATE_OFF
);
1369 spin_lock_irqsave(&port
->lock
, flags
);
1373 * Wake up anyone trying to open this port.
1375 clear_bit(ASYNCB_NORMAL_ACTIVE
, &port
->flags
);
1376 clear_bit(ASYNCB_CLOSING
, &port
->flags
);
1377 spin_unlock_irqrestore(&port
->lock
, flags
);
1378 wake_up_interruptible(&port
->open_wait
);
1379 wake_up_interruptible(&port
->close_wait
);
1381 mutex_unlock(&port
->mutex
);
1384 static void uart_wait_until_sent(struct tty_struct
*tty
, int timeout
)
1386 struct uart_state
*state
= tty
->driver_data
;
1387 struct uart_port
*port
= state
->uart_port
;
1388 unsigned long char_time
, expire
;
1390 if (port
->type
== PORT_UNKNOWN
|| port
->fifosize
== 0)
1394 * Set the check interval to be 1/5 of the estimated time to
1395 * send a single character, and make it at least 1. The check
1396 * interval should also be less than the timeout.
1398 * Note: we have to use pretty tight timings here to satisfy
1401 char_time
= (port
->timeout
- HZ
/50) / port
->fifosize
;
1402 char_time
= char_time
/ 5;
1405 if (timeout
&& timeout
< char_time
)
1406 char_time
= timeout
;
1409 * If the transmitter hasn't cleared in twice the approximate
1410 * amount of time to send the entire FIFO, it probably won't
1411 * ever clear. This assumes the UART isn't doing flow
1412 * control, which is currently the case. Hence, if it ever
1413 * takes longer than port->timeout, this is probably due to a
1414 * UART bug of some kind. So, we clamp the timeout parameter at
1417 if (timeout
== 0 || timeout
> 2 * port
->timeout
)
1418 timeout
= 2 * port
->timeout
;
1420 expire
= jiffies
+ timeout
;
1422 pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n",
1423 port
->line
, jiffies
, expire
);
1426 * Check whether the transmitter is empty every 'char_time'.
1427 * 'timeout' / 'expire' give us the maximum amount of time
1430 while (!port
->ops
->tx_empty(port
)) {
1431 msleep_interruptible(jiffies_to_msecs(char_time
));
1432 if (signal_pending(current
))
1434 if (time_after(jiffies
, expire
))
1440 * Calls to uart_hangup() are serialised by the tty_lock in
1441 * drivers/tty/tty_io.c:do_tty_hangup()
1442 * This runs from a workqueue and can sleep for a _short_ time only.
1444 static void uart_hangup(struct tty_struct
*tty
)
1446 struct uart_state
*state
= tty
->driver_data
;
1447 struct tty_port
*port
= &state
->port
;
1448 unsigned long flags
;
1450 pr_debug("uart_hangup(%d)\n", state
->uart_port
->line
);
1452 mutex_lock(&port
->mutex
);
1453 if (port
->flags
& ASYNC_NORMAL_ACTIVE
) {
1454 uart_flush_buffer(tty
);
1455 uart_shutdown(tty
, state
);
1456 spin_lock_irqsave(&port
->lock
, flags
);
1458 clear_bit(ASYNCB_NORMAL_ACTIVE
, &port
->flags
);
1459 spin_unlock_irqrestore(&port
->lock
, flags
);
1460 tty_port_tty_set(port
, NULL
);
1461 wake_up_interruptible(&port
->open_wait
);
1462 wake_up_interruptible(&port
->delta_msr_wait
);
1464 mutex_unlock(&port
->mutex
);
1467 static int uart_port_activate(struct tty_port
*port
, struct tty_struct
*tty
)
1472 static void uart_port_shutdown(struct tty_port
*port
)
1474 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
1475 struct uart_port
*uport
= state
->uart_port
;
1478 * clear delta_msr_wait queue to avoid mem leaks: we may free
1479 * the irq here so the queue might never be woken up. Note
1480 * that we won't end up waiting on delta_msr_wait again since
1481 * any outstanding file descriptors should be pointing at
1482 * hung_up_tty_fops now.
1484 wake_up_interruptible(&port
->delta_msr_wait
);
1487 * Free the IRQ and disable the port.
1489 uport
->ops
->shutdown(uport
);
1492 * Ensure that the IRQ handler isn't running on another CPU.
1494 synchronize_irq(uport
->irq
);
1497 static int uart_carrier_raised(struct tty_port
*port
)
1499 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
1500 struct uart_port
*uport
= state
->uart_port
;
1502 spin_lock_irq(&uport
->lock
);
1503 uport
->ops
->enable_ms(uport
);
1504 mctrl
= uport
->ops
->get_mctrl(uport
);
1505 spin_unlock_irq(&uport
->lock
);
1506 if (mctrl
& TIOCM_CAR
)
1511 static void uart_dtr_rts(struct tty_port
*port
, int onoff
)
1513 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
1514 struct uart_port
*uport
= state
->uart_port
;
1517 uart_set_mctrl(uport
, TIOCM_DTR
| TIOCM_RTS
);
1519 uart_clear_mctrl(uport
, TIOCM_DTR
| TIOCM_RTS
);
1523 * Calls to uart_open are serialised by the tty_lock in
1524 * drivers/tty/tty_io.c:tty_open()
1525 * Note that if this fails, then uart_close() _will_ be called.
1527 * In time, we want to scrap the "opening nonpresent ports"
1528 * behaviour and implement an alternative way for setserial
1529 * to set base addresses/ports/types. This will allow us to
1530 * get rid of a certain amount of extra tests.
1532 static int uart_open(struct tty_struct
*tty
, struct file
*filp
)
1534 struct uart_driver
*drv
= (struct uart_driver
*)tty
->driver
->driver_state
;
1535 int retval
, line
= tty
->index
;
1536 struct uart_state
*state
= drv
->state
+ line
;
1537 struct tty_port
*port
= &state
->port
;
1539 pr_debug("uart_open(%d) called\n", line
);
1542 * We take the semaphore here to guarantee that we won't be re-entered
1543 * while allocating the state structure, or while we request any IRQs
1544 * that the driver may need. This also has the nice side-effect that
1545 * it delays the action of uart_hangup, so we can guarantee that
1546 * state->port.tty will always contain something reasonable.
1548 if (mutex_lock_interruptible(&port
->mutex
)) {
1549 retval
= -ERESTARTSYS
;
1554 if (!state
->uart_port
|| state
->uart_port
->flags
& UPF_DEAD
) {
1560 * Once we set tty->driver_data here, we are guaranteed that
1561 * uart_close() will decrement the driver module use count.
1562 * Any failures from here onwards should not touch the count.
1564 tty
->driver_data
= state
;
1565 state
->uart_port
->state
= state
;
1566 state
->port
.low_latency
=
1567 (state
->uart_port
->flags
& UPF_LOW_LATENCY
) ? 1 : 0;
1568 tty_port_tty_set(port
, tty
);
1571 * If the port is in the middle of closing, bail out now.
1573 if (tty_hung_up_p(filp
)) {
1579 * Make sure the device is in D0 state.
1581 if (port
->count
== 1)
1582 uart_change_pm(state
, UART_PM_STATE_ON
);
1585 * Start up the serial port.
1587 retval
= uart_startup(tty
, state
, 0);
1590 * If we succeeded, wait until the port is ready.
1592 mutex_unlock(&port
->mutex
);
1594 retval
= tty_port_block_til_ready(port
, tty
, filp
);
1600 mutex_unlock(&port
->mutex
);
1604 static const char *uart_type(struct uart_port
*port
)
1606 const char *str
= NULL
;
1608 if (port
->ops
->type
)
1609 str
= port
->ops
->type(port
);
1617 #ifdef CONFIG_PROC_FS
1619 static void uart_line_info(struct seq_file
*m
, struct uart_driver
*drv
, int i
)
1621 struct uart_state
*state
= drv
->state
+ i
;
1622 struct tty_port
*port
= &state
->port
;
1623 enum uart_pm_state pm_state
;
1624 struct uart_port
*uport
= state
->uart_port
;
1626 unsigned int status
;
1632 mmio
= uport
->iotype
>= UPIO_MEM
;
1633 seq_printf(m
, "%d: uart:%s %s%08llX irq:%d",
1634 uport
->line
, uart_type(uport
),
1635 mmio
? "mmio:0x" : "port:",
1636 mmio
? (unsigned long long)uport
->mapbase
1637 : (unsigned long long)uport
->iobase
,
1640 if (uport
->type
== PORT_UNKNOWN
) {
1645 if (capable(CAP_SYS_ADMIN
)) {
1646 mutex_lock(&port
->mutex
);
1647 pm_state
= state
->pm_state
;
1648 if (pm_state
!= UART_PM_STATE_ON
)
1649 uart_change_pm(state
, UART_PM_STATE_ON
);
1650 spin_lock_irq(&uport
->lock
);
1651 status
= uport
->ops
->get_mctrl(uport
);
1652 spin_unlock_irq(&uport
->lock
);
1653 if (pm_state
!= UART_PM_STATE_ON
)
1654 uart_change_pm(state
, pm_state
);
1655 mutex_unlock(&port
->mutex
);
1657 seq_printf(m
, " tx:%d rx:%d",
1658 uport
->icount
.tx
, uport
->icount
.rx
);
1659 if (uport
->icount
.frame
)
1660 seq_printf(m
, " fe:%d",
1661 uport
->icount
.frame
);
1662 if (uport
->icount
.parity
)
1663 seq_printf(m
, " pe:%d",
1664 uport
->icount
.parity
);
1665 if (uport
->icount
.brk
)
1666 seq_printf(m
, " brk:%d",
1668 if (uport
->icount
.overrun
)
1669 seq_printf(m
, " oe:%d",
1670 uport
->icount
.overrun
);
1672 #define INFOBIT(bit, str) \
1673 if (uport->mctrl & (bit)) \
1674 strncat(stat_buf, (str), sizeof(stat_buf) - \
1675 strlen(stat_buf) - 2)
1676 #define STATBIT(bit, str) \
1677 if (status & (bit)) \
1678 strncat(stat_buf, (str), sizeof(stat_buf) - \
1679 strlen(stat_buf) - 2)
1683 INFOBIT(TIOCM_RTS
, "|RTS");
1684 STATBIT(TIOCM_CTS
, "|CTS");
1685 INFOBIT(TIOCM_DTR
, "|DTR");
1686 STATBIT(TIOCM_DSR
, "|DSR");
1687 STATBIT(TIOCM_CAR
, "|CD");
1688 STATBIT(TIOCM_RNG
, "|RI");
1692 seq_puts(m
, stat_buf
);
1699 static int uart_proc_show(struct seq_file
*m
, void *v
)
1701 struct tty_driver
*ttydrv
= m
->private;
1702 struct uart_driver
*drv
= ttydrv
->driver_state
;
1705 seq_printf(m
, "serinfo:1.0 driver%s%s revision:%s\n",
1707 for (i
= 0; i
< drv
->nr
; i
++)
1708 uart_line_info(m
, drv
, i
);
1712 static int uart_proc_open(struct inode
*inode
, struct file
*file
)
1714 return single_open(file
, uart_proc_show
, PDE_DATA(inode
));
1717 static const struct file_operations uart_proc_fops
= {
1718 .owner
= THIS_MODULE
,
1719 .open
= uart_proc_open
,
1721 .llseek
= seq_lseek
,
1722 .release
= single_release
,
1726 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
1728 * uart_console_write - write a console message to a serial port
1729 * @port: the port to write the message
1730 * @s: array of characters
1731 * @count: number of characters in string to write
1732 * @write: function to write character to port
1734 void uart_console_write(struct uart_port
*port
, const char *s
,
1736 void (*putchar
)(struct uart_port
*, int))
1740 for (i
= 0; i
< count
; i
++, s
++) {
1742 putchar(port
, '\r');
1746 EXPORT_SYMBOL_GPL(uart_console_write
);
1749 * Check whether an invalid uart number has been specified, and
1750 * if so, search for the first available port that does have
1753 struct uart_port
* __init
1754 uart_get_console(struct uart_port
*ports
, int nr
, struct console
*co
)
1756 int idx
= co
->index
;
1758 if (idx
< 0 || idx
>= nr
|| (ports
[idx
].iobase
== 0 &&
1759 ports
[idx
].membase
== NULL
))
1760 for (idx
= 0; idx
< nr
; idx
++)
1761 if (ports
[idx
].iobase
!= 0 ||
1762 ports
[idx
].membase
!= NULL
)
1771 * uart_parse_options - Parse serial port baud/parity/bits/flow contro.
1772 * @options: pointer to option string
1773 * @baud: pointer to an 'int' variable for the baud rate.
1774 * @parity: pointer to an 'int' variable for the parity.
1775 * @bits: pointer to an 'int' variable for the number of data bits.
1776 * @flow: pointer to an 'int' variable for the flow control character.
1778 * uart_parse_options decodes a string containing the serial console
1779 * options. The format of the string is <baud><parity><bits><flow>,
1783 uart_parse_options(char *options
, int *baud
, int *parity
, int *bits
, int *flow
)
1787 *baud
= simple_strtoul(s
, NULL
, 10);
1788 while (*s
>= '0' && *s
<= '9')
1797 EXPORT_SYMBOL_GPL(uart_parse_options
);
1804 static const struct baud_rates baud_rates
[] = {
1805 { 921600, B921600
},
1806 { 460800, B460800
},
1807 { 230400, B230400
},
1808 { 115200, B115200
},
1820 * uart_set_options - setup the serial console parameters
1821 * @port: pointer to the serial ports uart_port structure
1822 * @co: console pointer
1824 * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even)
1825 * @bits: number of data bits
1826 * @flow: flow control character - 'r' (rts)
1829 uart_set_options(struct uart_port
*port
, struct console
*co
,
1830 int baud
, int parity
, int bits
, int flow
)
1832 struct ktermios termios
;
1833 static struct ktermios dummy
;
1837 * Ensure that the serial console lock is initialised
1840 spin_lock_init(&port
->lock
);
1841 lockdep_set_class(&port
->lock
, &port_lock_key
);
1843 memset(&termios
, 0, sizeof(struct ktermios
));
1845 termios
.c_cflag
= CREAD
| HUPCL
| CLOCAL
;
1848 * Construct a cflag setting.
1850 for (i
= 0; baud_rates
[i
].rate
; i
++)
1851 if (baud_rates
[i
].rate
<= baud
)
1854 termios
.c_cflag
|= baud_rates
[i
].cflag
;
1857 termios
.c_cflag
|= CS7
;
1859 termios
.c_cflag
|= CS8
;
1863 termios
.c_cflag
|= PARODD
;
1866 termios
.c_cflag
|= PARENB
;
1871 termios
.c_cflag
|= CRTSCTS
;
1874 * some uarts on other side don't support no flow control.
1875 * So we set * DTR in host uart to make them happy
1877 port
->mctrl
|= TIOCM_DTR
;
1879 port
->ops
->set_termios(port
, &termios
, &dummy
);
1881 * Allow the setting of the UART parameters with a NULL console
1885 co
->cflag
= termios
.c_cflag
;
1889 EXPORT_SYMBOL_GPL(uart_set_options
);
1890 #endif /* CONFIG_SERIAL_CORE_CONSOLE */
1893 * uart_change_pm - set power state of the port
1895 * @state: port descriptor
1896 * @pm_state: new state
1898 * Locking: port->mutex has to be held
1900 static void uart_change_pm(struct uart_state
*state
,
1901 enum uart_pm_state pm_state
)
1903 struct uart_port
*port
= state
->uart_port
;
1905 if (state
->pm_state
!= pm_state
) {
1907 port
->ops
->pm(port
, pm_state
, state
->pm_state
);
1908 state
->pm_state
= pm_state
;
1913 struct uart_port
*port
;
1914 struct uart_driver
*driver
;
1917 static int serial_match_port(struct device
*dev
, void *data
)
1919 struct uart_match
*match
= data
;
1920 struct tty_driver
*tty_drv
= match
->driver
->tty_driver
;
1921 dev_t devt
= MKDEV(tty_drv
->major
, tty_drv
->minor_start
) +
1924 return dev
->devt
== devt
; /* Actually, only one tty per port */
1927 int uart_suspend_port(struct uart_driver
*drv
, struct uart_port
*uport
)
1929 struct uart_state
*state
= drv
->state
+ uport
->line
;
1930 struct tty_port
*port
= &state
->port
;
1931 struct device
*tty_dev
;
1932 struct uart_match match
= {uport
, drv
};
1934 mutex_lock(&port
->mutex
);
1936 tty_dev
= device_find_child(uport
->dev
, &match
, serial_match_port
);
1937 if (device_may_wakeup(tty_dev
)) {
1938 if (!enable_irq_wake(uport
->irq
))
1939 uport
->irq_wake
= 1;
1940 put_device(tty_dev
);
1941 mutex_unlock(&port
->mutex
);
1944 if (console_suspend_enabled
|| !uart_console(uport
))
1945 uport
->suspended
= 1;
1947 if (port
->flags
& ASYNC_INITIALIZED
) {
1948 const struct uart_ops
*ops
= uport
->ops
;
1951 if (console_suspend_enabled
|| !uart_console(uport
)) {
1952 set_bit(ASYNCB_SUSPENDED
, &port
->flags
);
1953 clear_bit(ASYNCB_INITIALIZED
, &port
->flags
);
1955 spin_lock_irq(&uport
->lock
);
1956 ops
->stop_tx(uport
);
1957 ops
->set_mctrl(uport
, 0);
1958 ops
->stop_rx(uport
);
1959 spin_unlock_irq(&uport
->lock
);
1963 * Wait for the transmitter to empty.
1965 for (tries
= 3; !ops
->tx_empty(uport
) && tries
; tries
--)
1968 printk(KERN_ERR
"%s%s%s%d: Unable to drain "
1970 uport
->dev
? dev_name(uport
->dev
) : "",
1971 uport
->dev
? ": " : "",
1973 drv
->tty_driver
->name_base
+ uport
->line
);
1975 if (console_suspend_enabled
|| !uart_console(uport
))
1976 ops
->shutdown(uport
);
1980 * Disable the console device before suspending.
1982 if (console_suspend_enabled
&& uart_console(uport
))
1983 console_stop(uport
->cons
);
1985 if (console_suspend_enabled
|| !uart_console(uport
))
1986 uart_change_pm(state
, UART_PM_STATE_OFF
);
1988 mutex_unlock(&port
->mutex
);
1993 int uart_resume_port(struct uart_driver
*drv
, struct uart_port
*uport
)
1995 struct uart_state
*state
= drv
->state
+ uport
->line
;
1996 struct tty_port
*port
= &state
->port
;
1997 struct device
*tty_dev
;
1998 struct uart_match match
= {uport
, drv
};
1999 struct ktermios termios
;
2001 mutex_lock(&port
->mutex
);
2003 tty_dev
= device_find_child(uport
->dev
, &match
, serial_match_port
);
2004 if (!uport
->suspended
&& device_may_wakeup(tty_dev
)) {
2005 if (uport
->irq_wake
) {
2006 disable_irq_wake(uport
->irq
);
2007 uport
->irq_wake
= 0;
2009 mutex_unlock(&port
->mutex
);
2012 uport
->suspended
= 0;
2015 * Re-enable the console device after suspending.
2017 if (uart_console(uport
)) {
2019 * First try to use the console cflag setting.
2021 memset(&termios
, 0, sizeof(struct ktermios
));
2022 termios
.c_cflag
= uport
->cons
->cflag
;
2025 * If that's unset, use the tty termios setting.
2027 if (port
->tty
&& termios
.c_cflag
== 0)
2028 termios
= port
->tty
->termios
;
2030 if (console_suspend_enabled
)
2031 uart_change_pm(state
, UART_PM_STATE_ON
);
2032 uport
->ops
->set_termios(uport
, &termios
, NULL
);
2033 if (console_suspend_enabled
)
2034 console_start(uport
->cons
);
2037 if (port
->flags
& ASYNC_SUSPENDED
) {
2038 const struct uart_ops
*ops
= uport
->ops
;
2041 uart_change_pm(state
, UART_PM_STATE_ON
);
2042 spin_lock_irq(&uport
->lock
);
2043 ops
->set_mctrl(uport
, 0);
2044 spin_unlock_irq(&uport
->lock
);
2045 if (console_suspend_enabled
|| !uart_console(uport
)) {
2046 /* Protected by port mutex for now */
2047 struct tty_struct
*tty
= port
->tty
;
2048 ret
= ops
->startup(uport
);
2051 uart_change_speed(tty
, state
, NULL
);
2052 spin_lock_irq(&uport
->lock
);
2053 ops
->set_mctrl(uport
, uport
->mctrl
);
2054 ops
->start_tx(uport
);
2055 spin_unlock_irq(&uport
->lock
);
2056 set_bit(ASYNCB_INITIALIZED
, &port
->flags
);
2059 * Failed to resume - maybe hardware went away?
2060 * Clear the "initialized" flag so we won't try
2061 * to call the low level drivers shutdown method.
2063 uart_shutdown(tty
, state
);
2067 clear_bit(ASYNCB_SUSPENDED
, &port
->flags
);
2070 mutex_unlock(&port
->mutex
);
2076 uart_report_port(struct uart_driver
*drv
, struct uart_port
*port
)
2080 switch (port
->iotype
) {
2082 snprintf(address
, sizeof(address
), "I/O 0x%lx", port
->iobase
);
2085 snprintf(address
, sizeof(address
),
2086 "I/O 0x%lx offset 0x%x", port
->iobase
, port
->hub6
);
2092 snprintf(address
, sizeof(address
),
2093 "MMIO 0x%llx", (unsigned long long)port
->mapbase
);
2096 strlcpy(address
, "*unknown*", sizeof(address
));
2100 printk(KERN_INFO
"%s%s%s%d at %s (irq = %d) is a %s\n",
2101 port
->dev
? dev_name(port
->dev
) : "",
2102 port
->dev
? ": " : "",
2104 drv
->tty_driver
->name_base
+ port
->line
,
2105 address
, port
->irq
, uart_type(port
));
2109 uart_configure_port(struct uart_driver
*drv
, struct uart_state
*state
,
2110 struct uart_port
*port
)
2115 * If there isn't a port here, don't do anything further.
2117 if (!port
->iobase
&& !port
->mapbase
&& !port
->membase
)
2121 * Now do the auto configuration stuff. Note that config_port
2122 * is expected to claim the resources and map the port for us.
2125 if (port
->flags
& UPF_AUTO_IRQ
)
2126 flags
|= UART_CONFIG_IRQ
;
2127 if (port
->flags
& UPF_BOOT_AUTOCONF
) {
2128 if (!(port
->flags
& UPF_FIXED_TYPE
)) {
2129 port
->type
= PORT_UNKNOWN
;
2130 flags
|= UART_CONFIG_TYPE
;
2132 port
->ops
->config_port(port
, flags
);
2135 if (port
->type
!= PORT_UNKNOWN
) {
2136 unsigned long flags
;
2138 uart_report_port(drv
, port
);
2140 /* Power up port for set_mctrl() */
2141 uart_change_pm(state
, UART_PM_STATE_ON
);
2144 * Ensure that the modem control lines are de-activated.
2145 * keep the DTR setting that is set in uart_set_options()
2146 * We probably don't need a spinlock around this, but
2148 spin_lock_irqsave(&port
->lock
, flags
);
2149 port
->ops
->set_mctrl(port
, port
->mctrl
& TIOCM_DTR
);
2150 spin_unlock_irqrestore(&port
->lock
, flags
);
2153 * If this driver supports console, and it hasn't been
2154 * successfully registered yet, try to re-register it.
2155 * It may be that the port was not available.
2157 if (port
->cons
&& !(port
->cons
->flags
& CON_ENABLED
))
2158 register_console(port
->cons
);
2161 * Power down all ports by default, except the
2162 * console if we have one.
2164 if (!uart_console(port
))
2165 uart_change_pm(state
, UART_PM_STATE_OFF
);
2169 #ifdef CONFIG_CONSOLE_POLL
2171 static int uart_poll_init(struct tty_driver
*driver
, int line
, char *options
)
2173 struct uart_driver
*drv
= driver
->driver_state
;
2174 struct uart_state
*state
= drv
->state
+ line
;
2175 struct uart_port
*port
;
2182 if (!state
|| !state
->uart_port
)
2185 port
= state
->uart_port
;
2186 if (!(port
->ops
->poll_get_char
&& port
->ops
->poll_put_char
))
2189 if (port
->ops
->poll_init
) {
2190 struct tty_port
*tport
= &state
->port
;
2193 mutex_lock(&tport
->mutex
);
2195 * We don't set ASYNCB_INITIALIZED as we only initialized the
2196 * hw, e.g. state->xmit is still uninitialized.
2198 if (!test_bit(ASYNCB_INITIALIZED
, &tport
->flags
))
2199 ret
= port
->ops
->poll_init(port
);
2200 mutex_unlock(&tport
->mutex
);
2206 uart_parse_options(options
, &baud
, &parity
, &bits
, &flow
);
2207 return uart_set_options(port
, NULL
, baud
, parity
, bits
, flow
);
2213 static int uart_poll_get_char(struct tty_driver
*driver
, int line
)
2215 struct uart_driver
*drv
= driver
->driver_state
;
2216 struct uart_state
*state
= drv
->state
+ line
;
2217 struct uart_port
*port
;
2219 if (!state
|| !state
->uart_port
)
2222 port
= state
->uart_port
;
2223 return port
->ops
->poll_get_char(port
);
2226 static void uart_poll_put_char(struct tty_driver
*driver
, int line
, char ch
)
2228 struct uart_driver
*drv
= driver
->driver_state
;
2229 struct uart_state
*state
= drv
->state
+ line
;
2230 struct uart_port
*port
;
2232 if (!state
|| !state
->uart_port
)
2235 port
= state
->uart_port
;
2236 port
->ops
->poll_put_char(port
, ch
);
2240 static const struct tty_operations uart_ops
= {
2242 .close
= uart_close
,
2243 .write
= uart_write
,
2244 .put_char
= uart_put_char
,
2245 .flush_chars
= uart_flush_chars
,
2246 .write_room
= uart_write_room
,
2247 .chars_in_buffer
= uart_chars_in_buffer
,
2248 .flush_buffer
= uart_flush_buffer
,
2249 .ioctl
= uart_ioctl
,
2250 .throttle
= uart_throttle
,
2251 .unthrottle
= uart_unthrottle
,
2252 .send_xchar
= uart_send_xchar
,
2253 .set_termios
= uart_set_termios
,
2254 .set_ldisc
= uart_set_ldisc
,
2256 .start
= uart_start
,
2257 .hangup
= uart_hangup
,
2258 .break_ctl
= uart_break_ctl
,
2259 .wait_until_sent
= uart_wait_until_sent
,
2260 #ifdef CONFIG_PROC_FS
2261 .proc_fops
= &uart_proc_fops
,
2263 .tiocmget
= uart_tiocmget
,
2264 .tiocmset
= uart_tiocmset
,
2265 .get_icount
= uart_get_icount
,
2266 #ifdef CONFIG_CONSOLE_POLL
2267 .poll_init
= uart_poll_init
,
2268 .poll_get_char
= uart_poll_get_char
,
2269 .poll_put_char
= uart_poll_put_char
,
2273 static const struct tty_port_operations uart_port_ops
= {
2274 .activate
= uart_port_activate
,
2275 .shutdown
= uart_port_shutdown
,
2276 .carrier_raised
= uart_carrier_raised
,
2277 .dtr_rts
= uart_dtr_rts
,
2281 * uart_register_driver - register a driver with the uart core layer
2282 * @drv: low level driver structure
2284 * Register a uart driver with the core driver. We in turn register
2285 * with the tty layer, and initialise the core driver per-port state.
2287 * We have a proc file in /proc/tty/driver which is named after the
2290 * drv->port should be NULL, and the per-port structures should be
2291 * registered using uart_add_one_port after this call has succeeded.
2293 int uart_register_driver(struct uart_driver
*drv
)
2295 struct tty_driver
*normal
;
2301 * Maybe we should be using a slab cache for this, especially if
2302 * we have a large number of ports to handle.
2304 drv
->state
= kzalloc(sizeof(struct uart_state
) * drv
->nr
, GFP_KERNEL
);
2308 normal
= alloc_tty_driver(drv
->nr
);
2312 drv
->tty_driver
= normal
;
2314 normal
->driver_name
= drv
->driver_name
;
2315 normal
->name
= drv
->dev_name
;
2316 normal
->major
= drv
->major
;
2317 normal
->minor_start
= drv
->minor
;
2318 normal
->type
= TTY_DRIVER_TYPE_SERIAL
;
2319 normal
->subtype
= SERIAL_TYPE_NORMAL
;
2320 normal
->init_termios
= tty_std_termios
;
2321 normal
->init_termios
.c_cflag
= B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
2322 normal
->init_termios
.c_ispeed
= normal
->init_termios
.c_ospeed
= 9600;
2323 normal
->flags
= TTY_DRIVER_REAL_RAW
| TTY_DRIVER_DYNAMIC_DEV
;
2324 normal
->driver_state
= drv
;
2325 tty_set_operations(normal
, &uart_ops
);
2328 * Initialise the UART state(s).
2330 for (i
= 0; i
< drv
->nr
; i
++) {
2331 struct uart_state
*state
= drv
->state
+ i
;
2332 struct tty_port
*port
= &state
->port
;
2334 tty_port_init(port
);
2335 port
->ops
= &uart_port_ops
;
2336 port
->close_delay
= HZ
/ 2; /* .5 seconds */
2337 port
->closing_wait
= 30 * HZ
;/* 30 seconds */
2340 retval
= tty_register_driver(normal
);
2344 for (i
= 0; i
< drv
->nr
; i
++)
2345 tty_port_destroy(&drv
->state
[i
].port
);
2346 put_tty_driver(normal
);
2354 * uart_unregister_driver - remove a driver from the uart core layer
2355 * @drv: low level driver structure
2357 * Remove all references to a driver from the core driver. The low
2358 * level driver must have removed all its ports via the
2359 * uart_remove_one_port() if it registered them with uart_add_one_port().
2360 * (ie, drv->port == NULL)
2362 void uart_unregister_driver(struct uart_driver
*drv
)
2364 struct tty_driver
*p
= drv
->tty_driver
;
2367 tty_unregister_driver(p
);
2369 for (i
= 0; i
< drv
->nr
; i
++)
2370 tty_port_destroy(&drv
->state
[i
].port
);
2373 drv
->tty_driver
= NULL
;
2376 struct tty_driver
*uart_console_device(struct console
*co
, int *index
)
2378 struct uart_driver
*p
= co
->data
;
2380 return p
->tty_driver
;
2383 static ssize_t
uart_get_attr_uartclk(struct device
*dev
,
2384 struct device_attribute
*attr
, char *buf
)
2386 struct serial_struct tmp
;
2387 struct tty_port
*port
= dev_get_drvdata(dev
);
2389 uart_get_info(port
, &tmp
);
2390 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.baud_base
* 16);
2393 static ssize_t
uart_get_attr_type(struct device
*dev
,
2394 struct device_attribute
*attr
, char *buf
)
2396 struct serial_struct tmp
;
2397 struct tty_port
*port
= dev_get_drvdata(dev
);
2399 uart_get_info(port
, &tmp
);
2400 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.type
);
2402 static ssize_t
uart_get_attr_line(struct device
*dev
,
2403 struct device_attribute
*attr
, char *buf
)
2405 struct serial_struct tmp
;
2406 struct tty_port
*port
= dev_get_drvdata(dev
);
2408 uart_get_info(port
, &tmp
);
2409 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.line
);
2412 static ssize_t
uart_get_attr_port(struct device
*dev
,
2413 struct device_attribute
*attr
, char *buf
)
2415 struct serial_struct tmp
;
2416 struct tty_port
*port
= dev_get_drvdata(dev
);
2417 unsigned long ioaddr
;
2419 uart_get_info(port
, &tmp
);
2421 if (HIGH_BITS_OFFSET
)
2422 ioaddr
|= (unsigned long)tmp
.port_high
<< HIGH_BITS_OFFSET
;
2423 return snprintf(buf
, PAGE_SIZE
, "0x%lX\n", ioaddr
);
2426 static ssize_t
uart_get_attr_irq(struct device
*dev
,
2427 struct device_attribute
*attr
, char *buf
)
2429 struct serial_struct tmp
;
2430 struct tty_port
*port
= dev_get_drvdata(dev
);
2432 uart_get_info(port
, &tmp
);
2433 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.irq
);
2436 static ssize_t
uart_get_attr_flags(struct device
*dev
,
2437 struct device_attribute
*attr
, char *buf
)
2439 struct serial_struct tmp
;
2440 struct tty_port
*port
= dev_get_drvdata(dev
);
2442 uart_get_info(port
, &tmp
);
2443 return snprintf(buf
, PAGE_SIZE
, "0x%X\n", tmp
.flags
);
2446 static ssize_t
uart_get_attr_xmit_fifo_size(struct device
*dev
,
2447 struct device_attribute
*attr
, char *buf
)
2449 struct serial_struct tmp
;
2450 struct tty_port
*port
= dev_get_drvdata(dev
);
2452 uart_get_info(port
, &tmp
);
2453 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.xmit_fifo_size
);
2457 static ssize_t
uart_get_attr_close_delay(struct device
*dev
,
2458 struct device_attribute
*attr
, char *buf
)
2460 struct serial_struct tmp
;
2461 struct tty_port
*port
= dev_get_drvdata(dev
);
2463 uart_get_info(port
, &tmp
);
2464 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.close_delay
);
2468 static ssize_t
uart_get_attr_closing_wait(struct device
*dev
,
2469 struct device_attribute
*attr
, char *buf
)
2471 struct serial_struct tmp
;
2472 struct tty_port
*port
= dev_get_drvdata(dev
);
2474 uart_get_info(port
, &tmp
);
2475 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.closing_wait
);
2478 static ssize_t
uart_get_attr_custom_divisor(struct device
*dev
,
2479 struct device_attribute
*attr
, char *buf
)
2481 struct serial_struct tmp
;
2482 struct tty_port
*port
= dev_get_drvdata(dev
);
2484 uart_get_info(port
, &tmp
);
2485 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.custom_divisor
);
2488 static ssize_t
uart_get_attr_io_type(struct device
*dev
,
2489 struct device_attribute
*attr
, char *buf
)
2491 struct serial_struct tmp
;
2492 struct tty_port
*port
= dev_get_drvdata(dev
);
2494 uart_get_info(port
, &tmp
);
2495 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.io_type
);
2498 static ssize_t
uart_get_attr_iomem_base(struct device
*dev
,
2499 struct device_attribute
*attr
, char *buf
)
2501 struct serial_struct tmp
;
2502 struct tty_port
*port
= dev_get_drvdata(dev
);
2504 uart_get_info(port
, &tmp
);
2505 return snprintf(buf
, PAGE_SIZE
, "0x%lX\n", (unsigned long)tmp
.iomem_base
);
2508 static ssize_t
uart_get_attr_iomem_reg_shift(struct device
*dev
,
2509 struct device_attribute
*attr
, char *buf
)
2511 struct serial_struct tmp
;
2512 struct tty_port
*port
= dev_get_drvdata(dev
);
2514 uart_get_info(port
, &tmp
);
2515 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.iomem_reg_shift
);
2518 static DEVICE_ATTR(type
, S_IRUSR
| S_IRGRP
, uart_get_attr_type
, NULL
);
2519 static DEVICE_ATTR(line
, S_IRUSR
| S_IRGRP
, uart_get_attr_line
, NULL
);
2520 static DEVICE_ATTR(port
, S_IRUSR
| S_IRGRP
, uart_get_attr_port
, NULL
);
2521 static DEVICE_ATTR(irq
, S_IRUSR
| S_IRGRP
, uart_get_attr_irq
, NULL
);
2522 static DEVICE_ATTR(flags
, S_IRUSR
| S_IRGRP
, uart_get_attr_flags
, NULL
);
2523 static DEVICE_ATTR(xmit_fifo_size
, S_IRUSR
| S_IRGRP
, uart_get_attr_xmit_fifo_size
, NULL
);
2524 static DEVICE_ATTR(uartclk
, S_IRUSR
| S_IRGRP
, uart_get_attr_uartclk
, NULL
);
2525 static DEVICE_ATTR(close_delay
, S_IRUSR
| S_IRGRP
, uart_get_attr_close_delay
, NULL
);
2526 static DEVICE_ATTR(closing_wait
, S_IRUSR
| S_IRGRP
, uart_get_attr_closing_wait
, NULL
);
2527 static DEVICE_ATTR(custom_divisor
, S_IRUSR
| S_IRGRP
, uart_get_attr_custom_divisor
, NULL
);
2528 static DEVICE_ATTR(io_type
, S_IRUSR
| S_IRGRP
, uart_get_attr_io_type
, NULL
);
2529 static DEVICE_ATTR(iomem_base
, S_IRUSR
| S_IRGRP
, uart_get_attr_iomem_base
, NULL
);
2530 static DEVICE_ATTR(iomem_reg_shift
, S_IRUSR
| S_IRGRP
, uart_get_attr_iomem_reg_shift
, NULL
);
2532 static struct attribute
*tty_dev_attrs
[] = {
2533 &dev_attr_type
.attr
,
2534 &dev_attr_line
.attr
,
2535 &dev_attr_port
.attr
,
2537 &dev_attr_flags
.attr
,
2538 &dev_attr_xmit_fifo_size
.attr
,
2539 &dev_attr_uartclk
.attr
,
2540 &dev_attr_close_delay
.attr
,
2541 &dev_attr_closing_wait
.attr
,
2542 &dev_attr_custom_divisor
.attr
,
2543 &dev_attr_io_type
.attr
,
2544 &dev_attr_iomem_base
.attr
,
2545 &dev_attr_iomem_reg_shift
.attr
,
2549 static const struct attribute_group tty_dev_attr_group
= {
2550 .attrs
= tty_dev_attrs
,
2553 static const struct attribute_group
*tty_dev_attr_groups
[] = {
2554 &tty_dev_attr_group
,
2560 * uart_add_one_port - attach a driver-defined port structure
2561 * @drv: pointer to the uart low level driver structure for this port
2562 * @uport: uart port structure to use for this port.
2564 * This allows the driver to register its own uart_port structure
2565 * with the core driver. The main purpose is to allow the low
2566 * level uart drivers to expand uart_port, rather than having yet
2567 * more levels of structures.
2569 int uart_add_one_port(struct uart_driver
*drv
, struct uart_port
*uport
)
2571 struct uart_state
*state
;
2572 struct tty_port
*port
;
2574 struct device
*tty_dev
;
2576 BUG_ON(in_interrupt());
2578 if (uport
->line
>= drv
->nr
)
2581 state
= drv
->state
+ uport
->line
;
2582 port
= &state
->port
;
2584 mutex_lock(&port_mutex
);
2585 mutex_lock(&port
->mutex
);
2586 if (state
->uart_port
) {
2591 state
->uart_port
= uport
;
2592 state
->pm_state
= UART_PM_STATE_UNDEFINED
;
2594 uport
->cons
= drv
->cons
;
2595 uport
->state
= state
;
2598 * If this port is a console, then the spinlock is already
2601 if (!(uart_console(uport
) && (uport
->cons
->flags
& CON_ENABLED
))) {
2602 spin_lock_init(&uport
->lock
);
2603 lockdep_set_class(&uport
->lock
, &port_lock_key
);
2606 uart_configure_port(drv
, state
, uport
);
2609 * Register the port whether it's detected or not. This allows
2610 * setserial to be used to alter this ports parameters.
2612 tty_dev
= tty_port_register_device_attr(port
, drv
->tty_driver
,
2613 uport
->line
, uport
->dev
, port
, tty_dev_attr_groups
);
2614 if (likely(!IS_ERR(tty_dev
))) {
2615 device_set_wakeup_capable(tty_dev
, 1);
2617 printk(KERN_ERR
"Cannot register tty device on line %d\n",
2622 * Ensure UPF_DEAD is not set.
2624 uport
->flags
&= ~UPF_DEAD
;
2627 mutex_unlock(&port
->mutex
);
2628 mutex_unlock(&port_mutex
);
2634 * uart_remove_one_port - detach a driver defined port structure
2635 * @drv: pointer to the uart low level driver structure for this port
2636 * @uport: uart port structure for this port
2638 * This unhooks (and hangs up) the specified port structure from the
2639 * core driver. No further calls will be made to the low-level code
2642 int uart_remove_one_port(struct uart_driver
*drv
, struct uart_port
*uport
)
2644 struct uart_state
*state
= drv
->state
+ uport
->line
;
2645 struct tty_port
*port
= &state
->port
;
2648 BUG_ON(in_interrupt());
2650 if (state
->uart_port
!= uport
)
2651 printk(KERN_ALERT
"Removing wrong port: %p != %p\n",
2652 state
->uart_port
, uport
);
2654 mutex_lock(&port_mutex
);
2657 * Mark the port "dead" - this prevents any opens from
2658 * succeeding while we shut down the port.
2660 mutex_lock(&port
->mutex
);
2661 if (!state
->uart_port
) {
2662 mutex_unlock(&port
->mutex
);
2666 uport
->flags
|= UPF_DEAD
;
2667 mutex_unlock(&port
->mutex
);
2670 * Remove the devices from the tty layer
2672 tty_unregister_device(drv
->tty_driver
, uport
->line
);
2675 tty_vhangup(port
->tty
);
2678 * Free the port IO and memory resources, if any.
2680 if (uport
->type
!= PORT_UNKNOWN
)
2681 uport
->ops
->release_port(uport
);
2684 * Indicate that there isn't a port here anymore.
2686 uport
->type
= PORT_UNKNOWN
;
2688 state
->uart_port
= NULL
;
2690 mutex_unlock(&port_mutex
);
2696 * Are the two ports equivalent?
2698 int uart_match_port(struct uart_port
*port1
, struct uart_port
*port2
)
2700 if (port1
->iotype
!= port2
->iotype
)
2703 switch (port1
->iotype
) {
2705 return (port1
->iobase
== port2
->iobase
);
2707 return (port1
->iobase
== port2
->iobase
) &&
2708 (port1
->hub6
== port2
->hub6
);
2713 return (port1
->mapbase
== port2
->mapbase
);
2717 EXPORT_SYMBOL(uart_match_port
);
2720 * uart_handle_dcd_change - handle a change of carrier detect state
2721 * @uport: uart_port structure for the open port
2722 * @status: new carrier detect status, nonzero if active
2724 void uart_handle_dcd_change(struct uart_port
*uport
, unsigned int status
)
2726 struct tty_port
*port
= &uport
->state
->port
;
2727 struct tty_struct
*tty
= port
->tty
;
2728 struct tty_ldisc
*ld
= tty
? tty_ldisc_ref(tty
) : NULL
;
2731 if (ld
->ops
->dcd_change
)
2732 ld
->ops
->dcd_change(tty
, status
);
2733 tty_ldisc_deref(ld
);
2736 uport
->icount
.dcd
++;
2738 if (port
->flags
& ASYNC_CHECK_CD
) {
2740 wake_up_interruptible(&port
->open_wait
);
2745 EXPORT_SYMBOL_GPL(uart_handle_dcd_change
);
2748 * uart_handle_cts_change - handle a change of clear-to-send state
2749 * @uport: uart_port structure for the open port
2750 * @status: new clear to send status, nonzero if active
2752 void uart_handle_cts_change(struct uart_port
*uport
, unsigned int status
)
2754 struct tty_port
*port
= &uport
->state
->port
;
2755 struct tty_struct
*tty
= port
->tty
;
2757 uport
->icount
.cts
++;
2759 if (tty_port_cts_enabled(port
)) {
2760 if (tty
->hw_stopped
) {
2762 tty
->hw_stopped
= 0;
2763 uport
->ops
->start_tx(uport
);
2764 uart_write_wakeup(uport
);
2768 tty
->hw_stopped
= 1;
2769 uport
->ops
->stop_tx(uport
);
2774 EXPORT_SYMBOL_GPL(uart_handle_cts_change
);
2777 * uart_insert_char - push a char to the uart layer
2779 * User is responsible to call tty_flip_buffer_push when they are done with
2782 * @port: corresponding port
2783 * @status: state of the serial port RX buffer (LSR for 8250)
2784 * @overrun: mask of overrun bits in @status
2785 * @ch: character to push
2786 * @flag: flag for the character (see TTY_NORMAL and friends)
2788 void uart_insert_char(struct uart_port
*port
, unsigned int status
,
2789 unsigned int overrun
, unsigned int ch
, unsigned int flag
)
2791 struct tty_port
*tport
= &port
->state
->port
;
2793 if ((status
& port
->ignore_status_mask
& ~overrun
) == 0)
2794 if (tty_insert_flip_char(tport
, ch
, flag
) == 0)
2795 ++port
->icount
.buf_overrun
;
2798 * Overrun is special. Since it's reported immediately,
2799 * it doesn't affect the current character.
2801 if (status
& ~port
->ignore_status_mask
& overrun
)
2802 if (tty_insert_flip_char(tport
, 0, TTY_OVERRUN
) == 0)
2803 ++port
->icount
.buf_overrun
;
2805 EXPORT_SYMBOL_GPL(uart_insert_char
);
2807 EXPORT_SYMBOL(uart_write_wakeup
);
2808 EXPORT_SYMBOL(uart_register_driver
);
2809 EXPORT_SYMBOL(uart_unregister_driver
);
2810 EXPORT_SYMBOL(uart_suspend_port
);
2811 EXPORT_SYMBOL(uart_resume_port
);
2812 EXPORT_SYMBOL(uart_add_one_port
);
2813 EXPORT_SYMBOL(uart_remove_one_port
);
2815 MODULE_DESCRIPTION("Serial driver core");
2816 MODULE_LICENSE("GPL");