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 (port
->ops
->wake_peer
)
99 port
->ops
->wake_peer(port
);
101 if (!uart_circ_empty(&state
->xmit
) && state
->xmit
.buf
&&
102 !tty
->stopped
&& !tty
->hw_stopped
)
103 port
->ops
->start_tx(port
);
106 static void uart_start(struct tty_struct
*tty
)
108 struct uart_state
*state
= tty
->driver_data
;
109 struct uart_port
*port
= state
->uart_port
;
112 spin_lock_irqsave(&port
->lock
, flags
);
114 spin_unlock_irqrestore(&port
->lock
, flags
);
118 uart_update_mctrl(struct uart_port
*port
, unsigned int set
, unsigned int clear
)
123 spin_lock_irqsave(&port
->lock
, flags
);
125 port
->mctrl
= (old
& ~clear
) | set
;
126 if (old
!= port
->mctrl
)
127 port
->ops
->set_mctrl(port
, port
->mctrl
);
128 spin_unlock_irqrestore(&port
->lock
, flags
);
131 #define uart_set_mctrl(port, set) uart_update_mctrl(port, set, 0)
132 #define uart_clear_mctrl(port, clear) uart_update_mctrl(port, 0, clear)
135 * Startup the port. This will be called once per open. All calls
136 * will be serialised by the per-port mutex.
138 static int uart_port_startup(struct tty_struct
*tty
, struct uart_state
*state
,
141 struct uart_port
*uport
= state
->uart_port
;
142 struct tty_port
*port
= &state
->port
;
146 if (uport
->type
== PORT_UNKNOWN
)
150 * Initialise and allocate the transmit and temporary
153 if (!state
->xmit
.buf
) {
154 /* This is protected by the per port mutex */
155 page
= get_zeroed_page(GFP_KERNEL
);
159 state
->xmit
.buf
= (unsigned char *) page
;
160 uart_circ_clear(&state
->xmit
);
163 retval
= uport
->ops
->startup(uport
);
165 if (uart_console(uport
) && uport
->cons
->cflag
) {
166 tty
->termios
.c_cflag
= uport
->cons
->cflag
;
167 uport
->cons
->cflag
= 0;
170 * Initialise the hardware port settings.
172 uart_change_speed(tty
, state
, NULL
);
176 * Setup the RTS and DTR signals once the
177 * port is open and ready to respond.
179 if (tty
->termios
.c_cflag
& CBAUD
)
180 uart_set_mctrl(uport
, TIOCM_RTS
| TIOCM_DTR
);
183 if (tty_port_cts_enabled(port
)) {
184 spin_lock_irq(&uport
->lock
);
185 if (!(uport
->ops
->get_mctrl(uport
) & TIOCM_CTS
))
187 spin_unlock_irq(&uport
->lock
);
192 * This is to allow setserial on this port. People may want to set
193 * port/irq/type and then reconfigure the port properly if it failed
196 if (retval
&& capable(CAP_SYS_ADMIN
))
202 static int uart_startup(struct tty_struct
*tty
, struct uart_state
*state
,
205 struct tty_port
*port
= &state
->port
;
208 if (port
->flags
& ASYNC_INITIALIZED
)
212 * Set the TTY IO error marker - we will only clear this
213 * once we have successfully opened the port.
215 set_bit(TTY_IO_ERROR
, &tty
->flags
);
217 retval
= uart_port_startup(tty
, state
, init_hw
);
219 set_bit(ASYNCB_INITIALIZED
, &port
->flags
);
220 clear_bit(TTY_IO_ERROR
, &tty
->flags
);
221 } else if (retval
> 0)
228 * This routine will shutdown a serial port; interrupts are disabled, and
229 * DTR is dropped if the hangup on close termio flag is on. Calls to
230 * uart_shutdown are serialised by the per-port semaphore.
232 static void uart_shutdown(struct tty_struct
*tty
, struct uart_state
*state
)
234 struct uart_port
*uport
= state
->uart_port
;
235 struct tty_port
*port
= &state
->port
;
238 * Set the TTY IO error marker
241 set_bit(TTY_IO_ERROR
, &tty
->flags
);
243 if (test_and_clear_bit(ASYNCB_INITIALIZED
, &port
->flags
)) {
245 * Turn off DTR and RTS early.
247 if (uart_console(uport
) && tty
)
248 uport
->cons
->cflag
= tty
->termios
.c_cflag
;
250 if (!tty
|| (tty
->termios
.c_cflag
& HUPCL
))
251 uart_clear_mctrl(uport
, TIOCM_DTR
| TIOCM_RTS
);
253 uart_port_shutdown(port
);
257 * It's possible for shutdown to be called after suspend if we get
258 * a DCD drop (hangup) at just the right time. Clear suspended bit so
259 * we don't try to resume a port that has been shutdown.
261 clear_bit(ASYNCB_SUSPENDED
, &port
->flags
);
264 * Free the transmit buffer page.
266 if (state
->xmit
.buf
) {
267 free_page((unsigned long)state
->xmit
.buf
);
268 state
->xmit
.buf
= NULL
;
273 * uart_update_timeout - update per-port FIFO timeout.
274 * @port: uart_port structure describing the port
275 * @cflag: termios cflag value
276 * @baud: speed of the port
278 * Set the port FIFO timeout value. The @cflag value should
279 * reflect the actual hardware settings.
282 uart_update_timeout(struct uart_port
*port
, unsigned int cflag
,
287 /* byte size and parity */
288 switch (cflag
& CSIZE
) {
309 * The total number of bits to be transmitted in the fifo.
311 bits
= bits
* port
->fifosize
;
314 * Figure the timeout to send the above number of bits.
315 * Add .02 seconds of slop
317 port
->timeout
= (HZ
* bits
) / baud
+ HZ
/50;
320 EXPORT_SYMBOL(uart_update_timeout
);
323 * uart_get_baud_rate - return baud rate for a particular port
324 * @port: uart_port structure describing the port in question.
325 * @termios: desired termios settings.
326 * @old: old termios (or NULL)
327 * @min: minimum acceptable baud rate
328 * @max: maximum acceptable baud rate
330 * Decode the termios structure into a numeric baud rate,
331 * taking account of the magic 38400 baud rate (with spd_*
332 * flags), and mapping the %B0 rate to 9600 baud.
334 * If the new baud rate is invalid, try the old termios setting.
335 * If it's still invalid, we try 9600 baud.
337 * Update the @termios structure to reflect the baud rate
338 * we're actually going to be using. Don't do this for the case
339 * where B0 is requested ("hang up").
342 uart_get_baud_rate(struct uart_port
*port
, struct ktermios
*termios
,
343 struct ktermios
*old
, unsigned int min
, unsigned int max
)
345 unsigned int try, baud
, altbaud
= 38400;
347 upf_t flags
= port
->flags
& UPF_SPD_MASK
;
349 if (flags
== UPF_SPD_HI
)
351 else if (flags
== UPF_SPD_VHI
)
353 else if (flags
== UPF_SPD_SHI
)
355 else if (flags
== UPF_SPD_WARP
)
358 for (try = 0; try < 2; try++) {
359 baud
= tty_termios_baud_rate(termios
);
362 * The spd_hi, spd_vhi, spd_shi, spd_warp kludge...
365 if (try == 0 && baud
== 38400)
369 * Special case: B0 rate.
376 if (baud
>= min
&& baud
<= max
)
380 * Oops, the quotient was zero. Try again with
381 * the old baud rate if possible.
383 termios
->c_cflag
&= ~CBAUD
;
385 baud
= tty_termios_baud_rate(old
);
387 tty_termios_encode_baud_rate(termios
,
394 * As a last resort, if the range cannot be met then clip to
395 * the nearest chip supported rate.
399 tty_termios_encode_baud_rate(termios
,
402 tty_termios_encode_baud_rate(termios
,
406 /* Should never happen */
411 EXPORT_SYMBOL(uart_get_baud_rate
);
414 * uart_get_divisor - return uart clock divisor
415 * @port: uart_port structure describing the port.
416 * @baud: desired baud rate
418 * Calculate the uart clock divisor for the port.
421 uart_get_divisor(struct uart_port
*port
, unsigned int baud
)
426 * Old custom speed handling.
428 if (baud
== 38400 && (port
->flags
& UPF_SPD_MASK
) == UPF_SPD_CUST
)
429 quot
= port
->custom_divisor
;
431 quot
= DIV_ROUND_CLOSEST(port
->uartclk
, 16 * baud
);
436 EXPORT_SYMBOL(uart_get_divisor
);
438 /* FIXME: Consistent locking policy */
439 static void uart_change_speed(struct tty_struct
*tty
, struct uart_state
*state
,
440 struct ktermios
*old_termios
)
442 struct tty_port
*port
= &state
->port
;
443 struct uart_port
*uport
= state
->uart_port
;
444 struct ktermios
*termios
;
447 * If we have no tty, termios, or the port does not exist,
448 * then we can't set the parameters for this port.
450 if (!tty
|| uport
->type
== PORT_UNKNOWN
)
453 termios
= &tty
->termios
;
456 * Set flags based on termios cflag
458 if (termios
->c_cflag
& CRTSCTS
)
459 set_bit(ASYNCB_CTS_FLOW
, &port
->flags
);
461 clear_bit(ASYNCB_CTS_FLOW
, &port
->flags
);
463 if (termios
->c_cflag
& CLOCAL
)
464 clear_bit(ASYNCB_CHECK_CD
, &port
->flags
);
466 set_bit(ASYNCB_CHECK_CD
, &port
->flags
);
468 uport
->ops
->set_termios(uport
, termios
, old_termios
);
471 static inline int __uart_put_char(struct uart_port
*port
,
472 struct circ_buf
*circ
, unsigned char c
)
480 spin_lock_irqsave(&port
->lock
, flags
);
481 if (uart_circ_chars_free(circ
) != 0) {
482 circ
->buf
[circ
->head
] = c
;
483 circ
->head
= (circ
->head
+ 1) & (UART_XMIT_SIZE
- 1);
486 spin_unlock_irqrestore(&port
->lock
, flags
);
490 static int uart_put_char(struct tty_struct
*tty
, unsigned char ch
)
492 struct uart_state
*state
= tty
->driver_data
;
494 return __uart_put_char(state
->uart_port
, &state
->xmit
, ch
);
497 static void uart_flush_chars(struct tty_struct
*tty
)
502 static int uart_write(struct tty_struct
*tty
,
503 const unsigned char *buf
, int count
)
505 struct uart_state
*state
= tty
->driver_data
;
506 struct uart_port
*port
;
507 struct circ_buf
*circ
;
512 * This means you called this function _after_ the port was
513 * closed. No cookie for you.
520 port
= state
->uart_port
;
526 spin_lock_irqsave(&port
->lock
, flags
);
528 c
= CIRC_SPACE_TO_END(circ
->head
, circ
->tail
, UART_XMIT_SIZE
);
533 memcpy(circ
->buf
+ circ
->head
, buf
, c
);
534 circ
->head
= (circ
->head
+ c
) & (UART_XMIT_SIZE
- 1);
539 spin_unlock_irqrestore(&port
->lock
, flags
);
545 static int uart_write_room(struct tty_struct
*tty
)
547 struct uart_state
*state
= tty
->driver_data
;
551 spin_lock_irqsave(&state
->uart_port
->lock
, flags
);
552 ret
= uart_circ_chars_free(&state
->xmit
);
553 spin_unlock_irqrestore(&state
->uart_port
->lock
, flags
);
557 static int uart_chars_in_buffer(struct tty_struct
*tty
)
559 struct uart_state
*state
= tty
->driver_data
;
563 spin_lock_irqsave(&state
->uart_port
->lock
, flags
);
564 ret
= uart_circ_chars_pending(&state
->xmit
);
565 spin_unlock_irqrestore(&state
->uart_port
->lock
, flags
);
569 static void uart_flush_buffer(struct tty_struct
*tty
)
571 struct uart_state
*state
= tty
->driver_data
;
572 struct uart_port
*port
;
576 * This means you called this function _after_ the port was
577 * closed. No cookie for you.
584 port
= state
->uart_port
;
585 pr_debug("uart_flush_buffer(%d) called\n", tty
->index
);
587 spin_lock_irqsave(&port
->lock
, flags
);
588 uart_circ_clear(&state
->xmit
);
589 if (port
->ops
->flush_buffer
)
590 port
->ops
->flush_buffer(port
);
591 spin_unlock_irqrestore(&port
->lock
, flags
);
596 * This function is used to send a high-priority XON/XOFF character to
599 static void uart_send_xchar(struct tty_struct
*tty
, char ch
)
601 struct uart_state
*state
= tty
->driver_data
;
602 struct uart_port
*port
= state
->uart_port
;
605 if (port
->ops
->send_xchar
)
606 port
->ops
->send_xchar(port
, ch
);
610 spin_lock_irqsave(&port
->lock
, flags
);
611 port
->ops
->start_tx(port
);
612 spin_unlock_irqrestore(&port
->lock
, flags
);
617 static void uart_throttle(struct tty_struct
*tty
)
619 struct uart_state
*state
= tty
->driver_data
;
620 struct uart_port
*port
= state
->uart_port
;
624 mask
|= UPF_SOFT_FLOW
;
625 if (tty
->termios
.c_cflag
& CRTSCTS
)
626 mask
|= UPF_HARD_FLOW
;
628 if (port
->flags
& mask
) {
629 port
->ops
->throttle(port
);
630 mask
&= ~port
->flags
;
633 if (mask
& UPF_SOFT_FLOW
)
634 uart_send_xchar(tty
, STOP_CHAR(tty
));
636 if (mask
& UPF_HARD_FLOW
)
637 uart_clear_mctrl(port
, TIOCM_RTS
);
640 static void uart_unthrottle(struct tty_struct
*tty
)
642 struct uart_state
*state
= tty
->driver_data
;
643 struct uart_port
*port
= state
->uart_port
;
647 mask
|= UPF_SOFT_FLOW
;
648 if (tty
->termios
.c_cflag
& CRTSCTS
)
649 mask
|= UPF_HARD_FLOW
;
651 if (port
->flags
& mask
) {
652 port
->ops
->unthrottle(port
);
653 mask
&= ~port
->flags
;
656 if (mask
& UPF_SOFT_FLOW
) {
660 uart_send_xchar(tty
, START_CHAR(tty
));
663 if (mask
& UPF_HARD_FLOW
)
664 uart_set_mctrl(port
, TIOCM_RTS
);
667 static void do_uart_get_info(struct tty_port
*port
,
668 struct serial_struct
*retinfo
)
670 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
671 struct uart_port
*uport
= state
->uart_port
;
673 memset(retinfo
, 0, sizeof(*retinfo
));
675 retinfo
->type
= uport
->type
;
676 retinfo
->line
= uport
->line
;
677 retinfo
->port
= uport
->iobase
;
678 if (HIGH_BITS_OFFSET
)
679 retinfo
->port_high
= (long) uport
->iobase
>> HIGH_BITS_OFFSET
;
680 retinfo
->irq
= uport
->irq
;
681 retinfo
->flags
= uport
->flags
;
682 retinfo
->xmit_fifo_size
= uport
->fifosize
;
683 retinfo
->baud_base
= uport
->uartclk
/ 16;
684 retinfo
->close_delay
= jiffies_to_msecs(port
->close_delay
) / 10;
685 retinfo
->closing_wait
= port
->closing_wait
== ASYNC_CLOSING_WAIT_NONE
?
686 ASYNC_CLOSING_WAIT_NONE
:
687 jiffies_to_msecs(port
->closing_wait
) / 10;
688 retinfo
->custom_divisor
= uport
->custom_divisor
;
689 retinfo
->hub6
= uport
->hub6
;
690 retinfo
->io_type
= uport
->iotype
;
691 retinfo
->iomem_reg_shift
= uport
->regshift
;
692 retinfo
->iomem_base
= (void *)(unsigned long)uport
->mapbase
;
695 static void uart_get_info(struct tty_port
*port
,
696 struct serial_struct
*retinfo
)
698 /* Ensure the state we copy is consistent and no hardware changes
700 mutex_lock(&port
->mutex
);
701 do_uart_get_info(port
, retinfo
);
702 mutex_unlock(&port
->mutex
);
705 static int uart_get_info_user(struct tty_port
*port
,
706 struct serial_struct __user
*retinfo
)
708 struct serial_struct tmp
;
709 uart_get_info(port
, &tmp
);
711 if (copy_to_user(retinfo
, &tmp
, sizeof(*retinfo
)))
716 static int uart_set_info(struct tty_struct
*tty
, struct tty_port
*port
,
717 struct uart_state
*state
,
718 struct serial_struct
*new_info
)
720 struct uart_port
*uport
= state
->uart_port
;
721 unsigned long new_port
;
722 unsigned int change_irq
, change_port
, closing_wait
;
723 unsigned int old_custom_divisor
, close_delay
;
724 upf_t old_flags
, new_flags
;
727 new_port
= new_info
->port
;
728 if (HIGH_BITS_OFFSET
)
729 new_port
+= (unsigned long) new_info
->port_high
<< HIGH_BITS_OFFSET
;
731 new_info
->irq
= irq_canonicalize(new_info
->irq
);
732 close_delay
= msecs_to_jiffies(new_info
->close_delay
* 10);
733 closing_wait
= new_info
->closing_wait
== ASYNC_CLOSING_WAIT_NONE
?
734 ASYNC_CLOSING_WAIT_NONE
:
735 msecs_to_jiffies(new_info
->closing_wait
* 10);
738 change_irq
= !(uport
->flags
& UPF_FIXED_PORT
)
739 && new_info
->irq
!= uport
->irq
;
742 * Since changing the 'type' of the port changes its resource
743 * allocations, we should treat type changes the same as
746 change_port
= !(uport
->flags
& UPF_FIXED_PORT
)
747 && (new_port
!= uport
->iobase
||
748 (unsigned long)new_info
->iomem_base
!= uport
->mapbase
||
749 new_info
->hub6
!= uport
->hub6
||
750 new_info
->io_type
!= uport
->iotype
||
751 new_info
->iomem_reg_shift
!= uport
->regshift
||
752 new_info
->type
!= uport
->type
);
754 old_flags
= uport
->flags
;
755 new_flags
= new_info
->flags
;
756 old_custom_divisor
= uport
->custom_divisor
;
758 if (!capable(CAP_SYS_ADMIN
)) {
760 if (change_irq
|| change_port
||
761 (new_info
->baud_base
!= uport
->uartclk
/ 16) ||
762 (close_delay
!= port
->close_delay
) ||
763 (closing_wait
!= port
->closing_wait
) ||
764 (new_info
->xmit_fifo_size
&&
765 new_info
->xmit_fifo_size
!= uport
->fifosize
) ||
766 (((new_flags
^ old_flags
) & ~UPF_USR_MASK
) != 0))
768 uport
->flags
= ((uport
->flags
& ~UPF_USR_MASK
) |
769 (new_flags
& UPF_USR_MASK
));
770 uport
->custom_divisor
= new_info
->custom_divisor
;
775 * Ask the low level driver to verify the settings.
777 if (uport
->ops
->verify_port
)
778 retval
= uport
->ops
->verify_port(uport
, new_info
);
780 if ((new_info
->irq
>= nr_irqs
) || (new_info
->irq
< 0) ||
781 (new_info
->baud_base
< 9600))
787 if (change_port
|| change_irq
) {
791 * Make sure that we are the sole user of this port.
793 if (tty_port_users(port
) > 1)
797 * We need to shutdown the serial port at the old
798 * port/type/irq combination.
800 uart_shutdown(tty
, state
);
804 unsigned long old_iobase
, old_mapbase
;
805 unsigned int old_type
, old_iotype
, old_hub6
, old_shift
;
807 old_iobase
= uport
->iobase
;
808 old_mapbase
= uport
->mapbase
;
809 old_type
= uport
->type
;
810 old_hub6
= uport
->hub6
;
811 old_iotype
= uport
->iotype
;
812 old_shift
= uport
->regshift
;
815 * Free and release old regions
817 if (old_type
!= PORT_UNKNOWN
)
818 uport
->ops
->release_port(uport
);
820 uport
->iobase
= new_port
;
821 uport
->type
= new_info
->type
;
822 uport
->hub6
= new_info
->hub6
;
823 uport
->iotype
= new_info
->io_type
;
824 uport
->regshift
= new_info
->iomem_reg_shift
;
825 uport
->mapbase
= (unsigned long)new_info
->iomem_base
;
828 * Claim and map the new regions
830 if (uport
->type
!= PORT_UNKNOWN
) {
831 retval
= uport
->ops
->request_port(uport
);
833 /* Always success - Jean II */
838 * If we fail to request resources for the
839 * new port, try to restore the old settings.
841 if (retval
&& old_type
!= PORT_UNKNOWN
) {
842 uport
->iobase
= old_iobase
;
843 uport
->type
= old_type
;
844 uport
->hub6
= old_hub6
;
845 uport
->iotype
= old_iotype
;
846 uport
->regshift
= old_shift
;
847 uport
->mapbase
= old_mapbase
;
848 retval
= uport
->ops
->request_port(uport
);
850 * If we failed to restore the old settings,
854 uport
->type
= PORT_UNKNOWN
;
860 /* Added to return the correct error -Ram Gupta */
866 uport
->irq
= new_info
->irq
;
867 if (!(uport
->flags
& UPF_FIXED_PORT
))
868 uport
->uartclk
= new_info
->baud_base
* 16;
869 uport
->flags
= (uport
->flags
& ~UPF_CHANGE_MASK
) |
870 (new_flags
& UPF_CHANGE_MASK
);
871 uport
->custom_divisor
= new_info
->custom_divisor
;
872 port
->close_delay
= close_delay
;
873 port
->closing_wait
= closing_wait
;
874 if (new_info
->xmit_fifo_size
)
875 uport
->fifosize
= new_info
->xmit_fifo_size
;
876 port
->low_latency
= (uport
->flags
& UPF_LOW_LATENCY
) ? 1 : 0;
880 if (uport
->type
== PORT_UNKNOWN
)
882 if (port
->flags
& ASYNC_INITIALIZED
) {
883 if (((old_flags
^ uport
->flags
) & UPF_SPD_MASK
) ||
884 old_custom_divisor
!= uport
->custom_divisor
) {
886 * If they're setting up a custom divisor or speed,
887 * instead of clearing it, then bitch about it. No
888 * need to rate-limit; it's CAP_SYS_ADMIN only.
890 if (uport
->flags
& UPF_SPD_MASK
) {
893 "%s sets custom speed on %s. This "
894 "is deprecated.\n", current
->comm
,
895 tty_name(port
->tty
, buf
));
897 uart_change_speed(tty
, state
, NULL
);
900 retval
= uart_startup(tty
, state
, 1);
905 static int uart_set_info_user(struct tty_struct
*tty
, struct uart_state
*state
,
906 struct serial_struct __user
*newinfo
)
908 struct serial_struct new_serial
;
909 struct tty_port
*port
= &state
->port
;
912 if (copy_from_user(&new_serial
, newinfo
, sizeof(new_serial
)))
916 * This semaphore protects port->count. It is also
917 * very useful to prevent opens. Also, take the
918 * port configuration semaphore to make sure that a
919 * module insertion/removal doesn't change anything
922 mutex_lock(&port
->mutex
);
923 retval
= uart_set_info(tty
, port
, state
, &new_serial
);
924 mutex_unlock(&port
->mutex
);
929 * uart_get_lsr_info - get line status register info
930 * @tty: tty associated with the UART
931 * @state: UART being queried
932 * @value: returned modem value
934 * Note: uart_ioctl protects us against hangups.
936 static int uart_get_lsr_info(struct tty_struct
*tty
,
937 struct uart_state
*state
, unsigned int __user
*value
)
939 struct uart_port
*uport
= state
->uart_port
;
942 result
= uport
->ops
->tx_empty(uport
);
945 * If we're about to load something into the transmit
946 * register, we'll pretend the transmitter isn't empty to
947 * avoid a race condition (depending on when the transmit
948 * interrupt happens).
951 ((uart_circ_chars_pending(&state
->xmit
) > 0) &&
952 !tty
->stopped
&& !tty
->hw_stopped
))
953 result
&= ~TIOCSER_TEMT
;
955 return put_user(result
, value
);
958 static int uart_tiocmget(struct tty_struct
*tty
)
960 struct uart_state
*state
= tty
->driver_data
;
961 struct tty_port
*port
= &state
->port
;
962 struct uart_port
*uport
= state
->uart_port
;
965 mutex_lock(&port
->mutex
);
966 if (!(tty
->flags
& (1 << TTY_IO_ERROR
))) {
967 result
= uport
->mctrl
;
968 spin_lock_irq(&uport
->lock
);
969 result
|= uport
->ops
->get_mctrl(uport
);
970 spin_unlock_irq(&uport
->lock
);
972 mutex_unlock(&port
->mutex
);
978 uart_tiocmset(struct tty_struct
*tty
, unsigned int set
, unsigned int clear
)
980 struct uart_state
*state
= tty
->driver_data
;
981 struct uart_port
*uport
= state
->uart_port
;
982 struct tty_port
*port
= &state
->port
;
985 mutex_lock(&port
->mutex
);
986 if (!(tty
->flags
& (1 << TTY_IO_ERROR
))) {
987 uart_update_mctrl(uport
, set
, clear
);
990 mutex_unlock(&port
->mutex
);
994 static int uart_break_ctl(struct tty_struct
*tty
, int break_state
)
996 struct uart_state
*state
= tty
->driver_data
;
997 struct tty_port
*port
= &state
->port
;
998 struct uart_port
*uport
= state
->uart_port
;
1000 mutex_lock(&port
->mutex
);
1002 if (uport
->type
!= PORT_UNKNOWN
)
1003 uport
->ops
->break_ctl(uport
, break_state
);
1005 mutex_unlock(&port
->mutex
);
1009 static int uart_do_autoconfig(struct tty_struct
*tty
,struct uart_state
*state
)
1011 struct uart_port
*uport
= state
->uart_port
;
1012 struct tty_port
*port
= &state
->port
;
1015 if (!capable(CAP_SYS_ADMIN
))
1019 * Take the per-port semaphore. This prevents count from
1020 * changing, and hence any extra opens of the port while
1021 * we're auto-configuring.
1023 if (mutex_lock_interruptible(&port
->mutex
))
1024 return -ERESTARTSYS
;
1027 if (tty_port_users(port
) == 1) {
1028 uart_shutdown(tty
, state
);
1031 * If we already have a port type configured,
1032 * we must release its resources.
1034 if (uport
->type
!= PORT_UNKNOWN
)
1035 uport
->ops
->release_port(uport
);
1037 flags
= UART_CONFIG_TYPE
;
1038 if (uport
->flags
& UPF_AUTO_IRQ
)
1039 flags
|= UART_CONFIG_IRQ
;
1042 * This will claim the ports resources if
1045 uport
->ops
->config_port(uport
, flags
);
1047 ret
= uart_startup(tty
, state
, 1);
1049 mutex_unlock(&port
->mutex
);
1054 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1055 * - mask passed in arg for lines of interest
1056 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1057 * Caller should use TIOCGICOUNT to see which one it was
1059 * FIXME: This wants extracting into a common all driver implementation
1060 * of TIOCMWAIT using tty_port.
1063 uart_wait_modem_status(struct uart_state
*state
, unsigned long arg
)
1065 struct uart_port
*uport
= state
->uart_port
;
1066 struct tty_port
*port
= &state
->port
;
1067 DECLARE_WAITQUEUE(wait
, current
);
1068 struct uart_icount cprev
, cnow
;
1072 * note the counters on entry
1074 spin_lock_irq(&uport
->lock
);
1075 memcpy(&cprev
, &uport
->icount
, sizeof(struct uart_icount
));
1078 * Force modem status interrupts on
1080 uport
->ops
->enable_ms(uport
);
1081 spin_unlock_irq(&uport
->lock
);
1083 add_wait_queue(&port
->delta_msr_wait
, &wait
);
1085 spin_lock_irq(&uport
->lock
);
1086 memcpy(&cnow
, &uport
->icount
, sizeof(struct uart_icount
));
1087 spin_unlock_irq(&uport
->lock
);
1089 set_current_state(TASK_INTERRUPTIBLE
);
1091 if (((arg
& TIOCM_RNG
) && (cnow
.rng
!= cprev
.rng
)) ||
1092 ((arg
& TIOCM_DSR
) && (cnow
.dsr
!= cprev
.dsr
)) ||
1093 ((arg
& TIOCM_CD
) && (cnow
.dcd
!= cprev
.dcd
)) ||
1094 ((arg
& TIOCM_CTS
) && (cnow
.cts
!= cprev
.cts
))) {
1101 /* see if a signal did it */
1102 if (signal_pending(current
)) {
1110 current
->state
= TASK_RUNNING
;
1111 remove_wait_queue(&port
->delta_msr_wait
, &wait
);
1117 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1118 * Return: write counters to the user passed counter struct
1119 * NB: both 1->0 and 0->1 transitions are counted except for
1120 * RI where only 0->1 is counted.
1122 static int uart_get_icount(struct tty_struct
*tty
,
1123 struct serial_icounter_struct
*icount
)
1125 struct uart_state
*state
= tty
->driver_data
;
1126 struct uart_icount cnow
;
1127 struct uart_port
*uport
= state
->uart_port
;
1129 spin_lock_irq(&uport
->lock
);
1130 memcpy(&cnow
, &uport
->icount
, sizeof(struct uart_icount
));
1131 spin_unlock_irq(&uport
->lock
);
1133 icount
->cts
= cnow
.cts
;
1134 icount
->dsr
= cnow
.dsr
;
1135 icount
->rng
= cnow
.rng
;
1136 icount
->dcd
= cnow
.dcd
;
1137 icount
->rx
= cnow
.rx
;
1138 icount
->tx
= cnow
.tx
;
1139 icount
->frame
= cnow
.frame
;
1140 icount
->overrun
= cnow
.overrun
;
1141 icount
->parity
= cnow
.parity
;
1142 icount
->brk
= cnow
.brk
;
1143 icount
->buf_overrun
= cnow
.buf_overrun
;
1149 * Called via sys_ioctl. We can use spin_lock_irq() here.
1152 uart_ioctl(struct tty_struct
*tty
, unsigned int cmd
,
1155 struct uart_state
*state
= tty
->driver_data
;
1156 struct tty_port
*port
= &state
->port
;
1157 void __user
*uarg
= (void __user
*)arg
;
1158 int ret
= -ENOIOCTLCMD
;
1162 * These ioctls don't rely on the hardware to be present.
1166 ret
= uart_get_info_user(port
, uarg
);
1170 ret
= uart_set_info_user(tty
, state
, uarg
);
1174 ret
= uart_do_autoconfig(tty
, state
);
1177 case TIOCSERGWILD
: /* obsolete */
1178 case TIOCSERSWILD
: /* obsolete */
1183 if (ret
!= -ENOIOCTLCMD
)
1186 if (tty
->flags
& (1 << TTY_IO_ERROR
)) {
1192 * The following should only be used when hardware is present.
1196 ret
= uart_wait_modem_status(state
, arg
);
1200 if (ret
!= -ENOIOCTLCMD
)
1203 mutex_lock(&port
->mutex
);
1205 if (tty
->flags
& (1 << TTY_IO_ERROR
)) {
1211 * All these rely on hardware being present and need to be
1212 * protected against the tty being hung up.
1215 case TIOCSERGETLSR
: /* Get line status register */
1216 ret
= uart_get_lsr_info(tty
, state
, uarg
);
1220 struct uart_port
*uport
= state
->uart_port
;
1221 if (uport
->ops
->ioctl
)
1222 ret
= uport
->ops
->ioctl(uport
, cmd
, arg
);
1227 mutex_unlock(&port
->mutex
);
1232 static void uart_set_ldisc(struct tty_struct
*tty
)
1234 struct uart_state
*state
= tty
->driver_data
;
1235 struct uart_port
*uport
= state
->uart_port
;
1237 if (uport
->ops
->set_ldisc
)
1238 uport
->ops
->set_ldisc(uport
, tty
->termios
.c_line
);
1241 static void uart_set_termios(struct tty_struct
*tty
,
1242 struct ktermios
*old_termios
)
1244 struct uart_state
*state
= tty
->driver_data
;
1245 struct uart_port
*uport
= state
->uart_port
;
1246 unsigned long flags
;
1247 unsigned int cflag
= tty
->termios
.c_cflag
;
1248 unsigned int iflag_mask
= IGNBRK
|BRKINT
|IGNPAR
|PARMRK
|INPCK
;
1249 bool sw_changed
= false;
1252 * Drivers doing software flow control also need to know
1253 * about changes to these input settings.
1255 if (uport
->flags
& UPF_SOFT_FLOW
) {
1256 iflag_mask
|= IXANY
|IXON
|IXOFF
;
1258 tty
->termios
.c_cc
[VSTART
] != old_termios
->c_cc
[VSTART
] ||
1259 tty
->termios
.c_cc
[VSTOP
] != old_termios
->c_cc
[VSTOP
];
1263 * These are the bits that are used to setup various
1264 * flags in the low level driver. We can ignore the Bfoo
1265 * bits in c_cflag; c_[io]speed will always be set
1266 * appropriately by set_termios() in tty_ioctl.c
1268 if ((cflag
^ old_termios
->c_cflag
) == 0 &&
1269 tty
->termios
.c_ospeed
== old_termios
->c_ospeed
&&
1270 tty
->termios
.c_ispeed
== old_termios
->c_ispeed
&&
1271 ((tty
->termios
.c_iflag
^ old_termios
->c_iflag
) & iflag_mask
) == 0 &&
1276 uart_change_speed(tty
, state
, old_termios
);
1278 /* Handle transition to B0 status */
1279 if ((old_termios
->c_cflag
& CBAUD
) && !(cflag
& CBAUD
))
1280 uart_clear_mctrl(uport
, TIOCM_RTS
| TIOCM_DTR
);
1281 /* Handle transition away from B0 status */
1282 else if (!(old_termios
->c_cflag
& CBAUD
) && (cflag
& CBAUD
)) {
1283 unsigned int mask
= TIOCM_DTR
;
1284 if (!(cflag
& CRTSCTS
) ||
1285 !test_bit(TTY_THROTTLED
, &tty
->flags
))
1287 uart_set_mctrl(uport
, mask
);
1291 * If the port is doing h/w assisted flow control, do nothing.
1292 * We assume that tty->hw_stopped has never been set.
1294 if (uport
->flags
& UPF_HARD_FLOW
)
1297 /* Handle turning off CRTSCTS */
1298 if ((old_termios
->c_cflag
& CRTSCTS
) && !(cflag
& CRTSCTS
)) {
1299 spin_lock_irqsave(&uport
->lock
, flags
);
1300 tty
->hw_stopped
= 0;
1302 spin_unlock_irqrestore(&uport
->lock
, flags
);
1304 /* Handle turning on CRTSCTS */
1305 else if (!(old_termios
->c_cflag
& CRTSCTS
) && (cflag
& CRTSCTS
)) {
1306 spin_lock_irqsave(&uport
->lock
, flags
);
1307 if (!(uport
->ops
->get_mctrl(uport
) & TIOCM_CTS
)) {
1308 tty
->hw_stopped
= 1;
1309 uport
->ops
->stop_tx(uport
);
1311 spin_unlock_irqrestore(&uport
->lock
, flags
);
1316 * Calls to uart_close() are serialised via the tty_lock in
1317 * drivers/tty/tty_io.c:tty_release()
1318 * drivers/tty/tty_io.c:do_tty_hangup()
1319 * This runs from a workqueue and can sleep for a _short_ time only.
1321 static void uart_close(struct tty_struct
*tty
, struct file
*filp
)
1323 struct uart_state
*state
= tty
->driver_data
;
1324 struct tty_port
*port
;
1325 struct uart_port
*uport
;
1326 unsigned long flags
;
1331 uport
= state
->uart_port
;
1332 port
= &state
->port
;
1334 pr_debug("uart_close(%d) called\n", uport
->line
);
1336 if (tty_port_close_start(port
, tty
, filp
) == 0)
1340 * At this point, we stop accepting input. To do this, we
1341 * disable the receive line status interrupts.
1343 if (port
->flags
& ASYNC_INITIALIZED
) {
1344 unsigned long flags
;
1345 spin_lock_irqsave(&uport
->lock
, flags
);
1346 uport
->ops
->stop_rx(uport
);
1347 spin_unlock_irqrestore(&uport
->lock
, flags
);
1349 * Before we drop DTR, make sure the UART transmitter
1350 * has completely drained; this is especially
1351 * important if there is a transmit FIFO!
1353 uart_wait_until_sent(tty
, uport
->timeout
);
1356 mutex_lock(&port
->mutex
);
1357 uart_shutdown(tty
, state
);
1358 uart_flush_buffer(tty
);
1360 tty_ldisc_flush(tty
);
1362 tty_port_tty_set(port
, NULL
);
1363 spin_lock_irqsave(&port
->lock
, flags
);
1366 if (port
->blocked_open
) {
1367 spin_unlock_irqrestore(&port
->lock
, flags
);
1368 if (port
->close_delay
)
1369 msleep_interruptible(
1370 jiffies_to_msecs(port
->close_delay
));
1371 spin_lock_irqsave(&port
->lock
, flags
);
1372 } else if (!uart_console(uport
)) {
1373 spin_unlock_irqrestore(&port
->lock
, flags
);
1374 uart_change_pm(state
, UART_PM_STATE_OFF
);
1375 spin_lock_irqsave(&port
->lock
, flags
);
1379 * Wake up anyone trying to open this port.
1381 clear_bit(ASYNCB_NORMAL_ACTIVE
, &port
->flags
);
1382 clear_bit(ASYNCB_CLOSING
, &port
->flags
);
1383 spin_unlock_irqrestore(&port
->lock
, flags
);
1384 wake_up_interruptible(&port
->open_wait
);
1385 wake_up_interruptible(&port
->close_wait
);
1387 mutex_unlock(&port
->mutex
);
1390 static void uart_wait_until_sent(struct tty_struct
*tty
, int timeout
)
1392 struct uart_state
*state
= tty
->driver_data
;
1393 struct uart_port
*port
= state
->uart_port
;
1394 unsigned long char_time
, expire
;
1396 if (port
->type
== PORT_UNKNOWN
|| port
->fifosize
== 0)
1400 * Set the check interval to be 1/5 of the estimated time to
1401 * send a single character, and make it at least 1. The check
1402 * interval should also be less than the timeout.
1404 * Note: we have to use pretty tight timings here to satisfy
1407 char_time
= (port
->timeout
- HZ
/50) / port
->fifosize
;
1408 char_time
= char_time
/ 5;
1411 if (timeout
&& timeout
< char_time
)
1412 char_time
= timeout
;
1415 * If the transmitter hasn't cleared in twice the approximate
1416 * amount of time to send the entire FIFO, it probably won't
1417 * ever clear. This assumes the UART isn't doing flow
1418 * control, which is currently the case. Hence, if it ever
1419 * takes longer than port->timeout, this is probably due to a
1420 * UART bug of some kind. So, we clamp the timeout parameter at
1423 if (timeout
== 0 || timeout
> 2 * port
->timeout
)
1424 timeout
= 2 * port
->timeout
;
1426 expire
= jiffies
+ timeout
;
1428 pr_debug("uart_wait_until_sent(%d), jiffies=%lu, expire=%lu...\n",
1429 port
->line
, jiffies
, expire
);
1432 * Check whether the transmitter is empty every 'char_time'.
1433 * 'timeout' / 'expire' give us the maximum amount of time
1436 while (!port
->ops
->tx_empty(port
)) {
1437 msleep_interruptible(jiffies_to_msecs(char_time
));
1438 if (signal_pending(current
))
1440 if (time_after(jiffies
, expire
))
1446 * Calls to uart_hangup() are serialised by the tty_lock in
1447 * drivers/tty/tty_io.c:do_tty_hangup()
1448 * This runs from a workqueue and can sleep for a _short_ time only.
1450 static void uart_hangup(struct tty_struct
*tty
)
1452 struct uart_state
*state
= tty
->driver_data
;
1453 struct tty_port
*port
= &state
->port
;
1454 unsigned long flags
;
1456 pr_debug("uart_hangup(%d)\n", state
->uart_port
->line
);
1458 mutex_lock(&port
->mutex
);
1459 if (port
->flags
& ASYNC_NORMAL_ACTIVE
) {
1460 uart_flush_buffer(tty
);
1461 uart_shutdown(tty
, state
);
1462 spin_lock_irqsave(&port
->lock
, flags
);
1464 clear_bit(ASYNCB_NORMAL_ACTIVE
, &port
->flags
);
1465 spin_unlock_irqrestore(&port
->lock
, flags
);
1466 tty_port_tty_set(port
, NULL
);
1467 wake_up_interruptible(&port
->open_wait
);
1468 wake_up_interruptible(&port
->delta_msr_wait
);
1470 mutex_unlock(&port
->mutex
);
1473 static int uart_port_activate(struct tty_port
*port
, struct tty_struct
*tty
)
1478 static void uart_port_shutdown(struct tty_port
*port
)
1480 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
1481 struct uart_port
*uport
= state
->uart_port
;
1484 * clear delta_msr_wait queue to avoid mem leaks: we may free
1485 * the irq here so the queue might never be woken up. Note
1486 * that we won't end up waiting on delta_msr_wait again since
1487 * any outstanding file descriptors should be pointing at
1488 * hung_up_tty_fops now.
1490 wake_up_interruptible(&port
->delta_msr_wait
);
1493 * Free the IRQ and disable the port.
1495 uport
->ops
->shutdown(uport
);
1498 * Ensure that the IRQ handler isn't running on another CPU.
1500 synchronize_irq(uport
->irq
);
1503 static int uart_carrier_raised(struct tty_port
*port
)
1505 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
1506 struct uart_port
*uport
= state
->uart_port
;
1508 spin_lock_irq(&uport
->lock
);
1509 uport
->ops
->enable_ms(uport
);
1510 mctrl
= uport
->ops
->get_mctrl(uport
);
1511 spin_unlock_irq(&uport
->lock
);
1512 if (mctrl
& TIOCM_CAR
)
1517 static void uart_dtr_rts(struct tty_port
*port
, int onoff
)
1519 struct uart_state
*state
= container_of(port
, struct uart_state
, port
);
1520 struct uart_port
*uport
= state
->uart_port
;
1523 uart_set_mctrl(uport
, TIOCM_DTR
| TIOCM_RTS
);
1525 uart_clear_mctrl(uport
, TIOCM_DTR
| TIOCM_RTS
);
1529 * Calls to uart_open are serialised by the tty_lock in
1530 * drivers/tty/tty_io.c:tty_open()
1531 * Note that if this fails, then uart_close() _will_ be called.
1533 * In time, we want to scrap the "opening nonpresent ports"
1534 * behaviour and implement an alternative way for setserial
1535 * to set base addresses/ports/types. This will allow us to
1536 * get rid of a certain amount of extra tests.
1538 static int uart_open(struct tty_struct
*tty
, struct file
*filp
)
1540 struct uart_driver
*drv
= (struct uart_driver
*)tty
->driver
->driver_state
;
1541 int retval
, line
= tty
->index
;
1542 struct uart_state
*state
= drv
->state
+ line
;
1543 struct tty_port
*port
= &state
->port
;
1545 pr_debug("uart_open(%d) called\n", line
);
1548 * We take the semaphore here to guarantee that we won't be re-entered
1549 * while allocating the state structure, or while we request any IRQs
1550 * that the driver may need. This also has the nice side-effect that
1551 * it delays the action of uart_hangup, so we can guarantee that
1552 * state->port.tty will always contain something reasonable.
1554 if (mutex_lock_interruptible(&port
->mutex
)) {
1555 retval
= -ERESTARTSYS
;
1560 if (!state
->uart_port
|| state
->uart_port
->flags
& UPF_DEAD
) {
1566 * Once we set tty->driver_data here, we are guaranteed that
1567 * uart_close() will decrement the driver module use count.
1568 * Any failures from here onwards should not touch the count.
1570 tty
->driver_data
= state
;
1571 state
->uart_port
->state
= state
;
1572 state
->port
.low_latency
=
1573 (state
->uart_port
->flags
& UPF_LOW_LATENCY
) ? 1 : 0;
1574 tty_port_tty_set(port
, tty
);
1577 * If the port is in the middle of closing, bail out now.
1579 if (tty_hung_up_p(filp
)) {
1585 * Make sure the device is in D0 state.
1587 if (port
->count
== 1)
1588 uart_change_pm(state
, UART_PM_STATE_ON
);
1591 * Start up the serial port.
1593 retval
= uart_startup(tty
, state
, 0);
1596 * If we succeeded, wait until the port is ready.
1598 mutex_unlock(&port
->mutex
);
1600 retval
= tty_port_block_til_ready(port
, tty
, filp
);
1606 mutex_unlock(&port
->mutex
);
1610 static const char *uart_type(struct uart_port
*port
)
1612 const char *str
= NULL
;
1614 if (port
->ops
->type
)
1615 str
= port
->ops
->type(port
);
1623 #ifdef CONFIG_PROC_FS
1625 static void uart_line_info(struct seq_file
*m
, struct uart_driver
*drv
, int i
)
1627 struct uart_state
*state
= drv
->state
+ i
;
1628 struct tty_port
*port
= &state
->port
;
1629 enum uart_pm_state pm_state
;
1630 struct uart_port
*uport
= state
->uart_port
;
1632 unsigned int status
;
1638 mmio
= uport
->iotype
>= UPIO_MEM
;
1639 seq_printf(m
, "%d: uart:%s %s%08llX irq:%d",
1640 uport
->line
, uart_type(uport
),
1641 mmio
? "mmio:0x" : "port:",
1642 mmio
? (unsigned long long)uport
->mapbase
1643 : (unsigned long long)uport
->iobase
,
1646 if (uport
->type
== PORT_UNKNOWN
) {
1651 if (capable(CAP_SYS_ADMIN
)) {
1652 mutex_lock(&port
->mutex
);
1653 pm_state
= state
->pm_state
;
1654 if (pm_state
!= UART_PM_STATE_ON
)
1655 uart_change_pm(state
, UART_PM_STATE_ON
);
1656 spin_lock_irq(&uport
->lock
);
1657 status
= uport
->ops
->get_mctrl(uport
);
1658 spin_unlock_irq(&uport
->lock
);
1659 if (pm_state
!= UART_PM_STATE_ON
)
1660 uart_change_pm(state
, pm_state
);
1661 mutex_unlock(&port
->mutex
);
1663 seq_printf(m
, " tx:%d rx:%d",
1664 uport
->icount
.tx
, uport
->icount
.rx
);
1665 if (uport
->icount
.frame
)
1666 seq_printf(m
, " fe:%d",
1667 uport
->icount
.frame
);
1668 if (uport
->icount
.parity
)
1669 seq_printf(m
, " pe:%d",
1670 uport
->icount
.parity
);
1671 if (uport
->icount
.brk
)
1672 seq_printf(m
, " brk:%d",
1674 if (uport
->icount
.overrun
)
1675 seq_printf(m
, " oe:%d",
1676 uport
->icount
.overrun
);
1678 #define INFOBIT(bit, str) \
1679 if (uport->mctrl & (bit)) \
1680 strncat(stat_buf, (str), sizeof(stat_buf) - \
1681 strlen(stat_buf) - 2)
1682 #define STATBIT(bit, str) \
1683 if (status & (bit)) \
1684 strncat(stat_buf, (str), sizeof(stat_buf) - \
1685 strlen(stat_buf) - 2)
1689 INFOBIT(TIOCM_RTS
, "|RTS");
1690 STATBIT(TIOCM_CTS
, "|CTS");
1691 INFOBIT(TIOCM_DTR
, "|DTR");
1692 STATBIT(TIOCM_DSR
, "|DSR");
1693 STATBIT(TIOCM_CAR
, "|CD");
1694 STATBIT(TIOCM_RNG
, "|RI");
1698 seq_puts(m
, stat_buf
);
1705 static int uart_proc_show(struct seq_file
*m
, void *v
)
1707 struct tty_driver
*ttydrv
= m
->private;
1708 struct uart_driver
*drv
= ttydrv
->driver_state
;
1711 seq_printf(m
, "serinfo:1.0 driver%s%s revision:%s\n",
1713 for (i
= 0; i
< drv
->nr
; i
++)
1714 uart_line_info(m
, drv
, i
);
1718 static int uart_proc_open(struct inode
*inode
, struct file
*file
)
1720 return single_open(file
, uart_proc_show
, PDE_DATA(inode
));
1723 static const struct file_operations uart_proc_fops
= {
1724 .owner
= THIS_MODULE
,
1725 .open
= uart_proc_open
,
1727 .llseek
= seq_lseek
,
1728 .release
= single_release
,
1732 #if defined(CONFIG_SERIAL_CORE_CONSOLE) || defined(CONFIG_CONSOLE_POLL)
1734 * uart_console_write - write a console message to a serial port
1735 * @port: the port to write the message
1736 * @s: array of characters
1737 * @count: number of characters in string to write
1738 * @write: function to write character to port
1740 void uart_console_write(struct uart_port
*port
, const char *s
,
1742 void (*putchar
)(struct uart_port
*, int))
1746 for (i
= 0; i
< count
; i
++, s
++) {
1748 putchar(port
, '\r');
1752 EXPORT_SYMBOL_GPL(uart_console_write
);
1755 * Check whether an invalid uart number has been specified, and
1756 * if so, search for the first available port that does have
1759 struct uart_port
* __init
1760 uart_get_console(struct uart_port
*ports
, int nr
, struct console
*co
)
1762 int idx
= co
->index
;
1764 if (idx
< 0 || idx
>= nr
|| (ports
[idx
].iobase
== 0 &&
1765 ports
[idx
].membase
== NULL
))
1766 for (idx
= 0; idx
< nr
; idx
++)
1767 if (ports
[idx
].iobase
!= 0 ||
1768 ports
[idx
].membase
!= NULL
)
1777 * uart_parse_options - Parse serial port baud/parity/bits/flow contro.
1778 * @options: pointer to option string
1779 * @baud: pointer to an 'int' variable for the baud rate.
1780 * @parity: pointer to an 'int' variable for the parity.
1781 * @bits: pointer to an 'int' variable for the number of data bits.
1782 * @flow: pointer to an 'int' variable for the flow control character.
1784 * uart_parse_options decodes a string containing the serial console
1785 * options. The format of the string is <baud><parity><bits><flow>,
1789 uart_parse_options(char *options
, int *baud
, int *parity
, int *bits
, int *flow
)
1793 *baud
= simple_strtoul(s
, NULL
, 10);
1794 while (*s
>= '0' && *s
<= '9')
1803 EXPORT_SYMBOL_GPL(uart_parse_options
);
1810 static const struct baud_rates baud_rates
[] = {
1811 { 921600, B921600
},
1812 { 460800, B460800
},
1813 { 230400, B230400
},
1814 { 115200, B115200
},
1826 * uart_set_options - setup the serial console parameters
1827 * @port: pointer to the serial ports uart_port structure
1828 * @co: console pointer
1830 * @parity: parity character - 'n' (none), 'o' (odd), 'e' (even)
1831 * @bits: number of data bits
1832 * @flow: flow control character - 'r' (rts)
1835 uart_set_options(struct uart_port
*port
, struct console
*co
,
1836 int baud
, int parity
, int bits
, int flow
)
1838 struct ktermios termios
;
1839 static struct ktermios dummy
;
1843 * Ensure that the serial console lock is initialised
1846 spin_lock_init(&port
->lock
);
1847 lockdep_set_class(&port
->lock
, &port_lock_key
);
1849 memset(&termios
, 0, sizeof(struct ktermios
));
1851 termios
.c_cflag
= CREAD
| HUPCL
| CLOCAL
;
1854 * Construct a cflag setting.
1856 for (i
= 0; baud_rates
[i
].rate
; i
++)
1857 if (baud_rates
[i
].rate
<= baud
)
1860 termios
.c_cflag
|= baud_rates
[i
].cflag
;
1863 termios
.c_cflag
|= CS7
;
1865 termios
.c_cflag
|= CS8
;
1869 termios
.c_cflag
|= PARODD
;
1872 termios
.c_cflag
|= PARENB
;
1877 termios
.c_cflag
|= CRTSCTS
;
1880 * some uarts on other side don't support no flow control.
1881 * So we set * DTR in host uart to make them happy
1883 port
->mctrl
|= TIOCM_DTR
;
1885 port
->ops
->set_termios(port
, &termios
, &dummy
);
1887 * Allow the setting of the UART parameters with a NULL console
1891 co
->cflag
= termios
.c_cflag
;
1895 EXPORT_SYMBOL_GPL(uart_set_options
);
1896 #endif /* CONFIG_SERIAL_CORE_CONSOLE */
1899 * uart_change_pm - set power state of the port
1901 * @state: port descriptor
1902 * @pm_state: new state
1904 * Locking: port->mutex has to be held
1906 static void uart_change_pm(struct uart_state
*state
,
1907 enum uart_pm_state pm_state
)
1909 struct uart_port
*port
= state
->uart_port
;
1911 if (state
->pm_state
!= pm_state
) {
1913 port
->ops
->pm(port
, pm_state
, state
->pm_state
);
1914 state
->pm_state
= pm_state
;
1919 struct uart_port
*port
;
1920 struct uart_driver
*driver
;
1923 static int serial_match_port(struct device
*dev
, void *data
)
1925 struct uart_match
*match
= data
;
1926 struct tty_driver
*tty_drv
= match
->driver
->tty_driver
;
1927 dev_t devt
= MKDEV(tty_drv
->major
, tty_drv
->minor_start
) +
1930 return dev
->devt
== devt
; /* Actually, only one tty per port */
1933 int uart_suspend_port(struct uart_driver
*drv
, struct uart_port
*uport
)
1935 struct uart_state
*state
= drv
->state
+ uport
->line
;
1936 struct tty_port
*port
= &state
->port
;
1937 struct device
*tty_dev
;
1938 struct uart_match match
= {uport
, drv
};
1940 mutex_lock(&port
->mutex
);
1942 tty_dev
= device_find_child(uport
->dev
, &match
, serial_match_port
);
1943 if (device_may_wakeup(tty_dev
)) {
1944 if (!enable_irq_wake(uport
->irq
))
1945 uport
->irq_wake
= 1;
1946 put_device(tty_dev
);
1947 mutex_unlock(&port
->mutex
);
1950 put_device(tty_dev
);
1952 if (console_suspend_enabled
|| !uart_console(uport
))
1953 uport
->suspended
= 1;
1955 if (port
->flags
& ASYNC_INITIALIZED
) {
1956 const struct uart_ops
*ops
= uport
->ops
;
1959 if (console_suspend_enabled
|| !uart_console(uport
)) {
1960 set_bit(ASYNCB_SUSPENDED
, &port
->flags
);
1961 clear_bit(ASYNCB_INITIALIZED
, &port
->flags
);
1963 spin_lock_irq(&uport
->lock
);
1964 ops
->stop_tx(uport
);
1965 ops
->set_mctrl(uport
, 0);
1966 ops
->stop_rx(uport
);
1967 spin_unlock_irq(&uport
->lock
);
1971 * Wait for the transmitter to empty.
1973 for (tries
= 3; !ops
->tx_empty(uport
) && tries
; tries
--)
1976 printk(KERN_ERR
"%s%s%s%d: Unable to drain "
1978 uport
->dev
? dev_name(uport
->dev
) : "",
1979 uport
->dev
? ": " : "",
1981 drv
->tty_driver
->name_base
+ uport
->line
);
1983 if (console_suspend_enabled
|| !uart_console(uport
))
1984 ops
->shutdown(uport
);
1988 * Disable the console device before suspending.
1990 if (console_suspend_enabled
&& uart_console(uport
))
1991 console_stop(uport
->cons
);
1993 if (console_suspend_enabled
|| !uart_console(uport
))
1994 uart_change_pm(state
, UART_PM_STATE_OFF
);
1996 mutex_unlock(&port
->mutex
);
2001 int uart_resume_port(struct uart_driver
*drv
, struct uart_port
*uport
)
2003 struct uart_state
*state
= drv
->state
+ uport
->line
;
2004 struct tty_port
*port
= &state
->port
;
2005 struct device
*tty_dev
;
2006 struct uart_match match
= {uport
, drv
};
2007 struct ktermios termios
;
2009 mutex_lock(&port
->mutex
);
2011 tty_dev
= device_find_child(uport
->dev
, &match
, serial_match_port
);
2012 if (!uport
->suspended
&& device_may_wakeup(tty_dev
)) {
2013 if (uport
->irq_wake
) {
2014 disable_irq_wake(uport
->irq
);
2015 uport
->irq_wake
= 0;
2017 put_device(tty_dev
);
2018 mutex_unlock(&port
->mutex
);
2021 put_device(tty_dev
);
2022 uport
->suspended
= 0;
2025 * Re-enable the console device after suspending.
2027 if (uart_console(uport
)) {
2029 * First try to use the console cflag setting.
2031 memset(&termios
, 0, sizeof(struct ktermios
));
2032 termios
.c_cflag
= uport
->cons
->cflag
;
2035 * If that's unset, use the tty termios setting.
2037 if (port
->tty
&& termios
.c_cflag
== 0)
2038 termios
= port
->tty
->termios
;
2040 if (console_suspend_enabled
)
2041 uart_change_pm(state
, UART_PM_STATE_ON
);
2042 uport
->ops
->set_termios(uport
, &termios
, NULL
);
2043 if (console_suspend_enabled
)
2044 console_start(uport
->cons
);
2047 if (port
->flags
& ASYNC_SUSPENDED
) {
2048 const struct uart_ops
*ops
= uport
->ops
;
2051 uart_change_pm(state
, UART_PM_STATE_ON
);
2052 spin_lock_irq(&uport
->lock
);
2053 ops
->set_mctrl(uport
, 0);
2054 spin_unlock_irq(&uport
->lock
);
2055 if (console_suspend_enabled
|| !uart_console(uport
)) {
2056 /* Protected by port mutex for now */
2057 struct tty_struct
*tty
= port
->tty
;
2058 ret
= ops
->startup(uport
);
2061 uart_change_speed(tty
, state
, NULL
);
2062 spin_lock_irq(&uport
->lock
);
2063 ops
->set_mctrl(uport
, uport
->mctrl
);
2064 ops
->start_tx(uport
);
2065 spin_unlock_irq(&uport
->lock
);
2066 set_bit(ASYNCB_INITIALIZED
, &port
->flags
);
2069 * Failed to resume - maybe hardware went away?
2070 * Clear the "initialized" flag so we won't try
2071 * to call the low level drivers shutdown method.
2073 uart_shutdown(tty
, state
);
2077 clear_bit(ASYNCB_SUSPENDED
, &port
->flags
);
2080 mutex_unlock(&port
->mutex
);
2086 uart_report_port(struct uart_driver
*drv
, struct uart_port
*port
)
2090 switch (port
->iotype
) {
2092 snprintf(address
, sizeof(address
), "I/O 0x%lx", port
->iobase
);
2095 snprintf(address
, sizeof(address
),
2096 "I/O 0x%lx offset 0x%x", port
->iobase
, port
->hub6
);
2102 snprintf(address
, sizeof(address
),
2103 "MMIO 0x%llx", (unsigned long long)port
->mapbase
);
2106 strlcpy(address
, "*unknown*", sizeof(address
));
2110 printk(KERN_INFO
"%s%s%s%d at %s (irq = %d) is a %s\n",
2111 port
->dev
? dev_name(port
->dev
) : "",
2112 port
->dev
? ": " : "",
2114 drv
->tty_driver
->name_base
+ port
->line
,
2115 address
, port
->irq
, uart_type(port
));
2119 uart_configure_port(struct uart_driver
*drv
, struct uart_state
*state
,
2120 struct uart_port
*port
)
2125 * If there isn't a port here, don't do anything further.
2127 if (!port
->iobase
&& !port
->mapbase
&& !port
->membase
)
2131 * Now do the auto configuration stuff. Note that config_port
2132 * is expected to claim the resources and map the port for us.
2135 if (port
->flags
& UPF_AUTO_IRQ
)
2136 flags
|= UART_CONFIG_IRQ
;
2137 if (port
->flags
& UPF_BOOT_AUTOCONF
) {
2138 if (!(port
->flags
& UPF_FIXED_TYPE
)) {
2139 port
->type
= PORT_UNKNOWN
;
2140 flags
|= UART_CONFIG_TYPE
;
2142 port
->ops
->config_port(port
, flags
);
2145 if (port
->type
!= PORT_UNKNOWN
) {
2146 unsigned long flags
;
2148 uart_report_port(drv
, port
);
2150 /* Power up port for set_mctrl() */
2151 uart_change_pm(state
, UART_PM_STATE_ON
);
2154 * Ensure that the modem control lines are de-activated.
2155 * keep the DTR setting that is set in uart_set_options()
2156 * We probably don't need a spinlock around this, but
2158 spin_lock_irqsave(&port
->lock
, flags
);
2159 port
->ops
->set_mctrl(port
, port
->mctrl
& TIOCM_DTR
);
2160 spin_unlock_irqrestore(&port
->lock
, flags
);
2163 * If this driver supports console, and it hasn't been
2164 * successfully registered yet, try to re-register it.
2165 * It may be that the port was not available.
2167 if (port
->cons
&& !(port
->cons
->flags
& CON_ENABLED
))
2168 register_console(port
->cons
);
2171 * Power down all ports by default, except the
2172 * console if we have one.
2174 if (!uart_console(port
))
2175 uart_change_pm(state
, UART_PM_STATE_OFF
);
2179 #ifdef CONFIG_CONSOLE_POLL
2181 static int uart_poll_init(struct tty_driver
*driver
, int line
, char *options
)
2183 struct uart_driver
*drv
= driver
->driver_state
;
2184 struct uart_state
*state
= drv
->state
+ line
;
2185 struct uart_port
*port
;
2192 if (!state
|| !state
->uart_port
)
2195 port
= state
->uart_port
;
2196 if (!(port
->ops
->poll_get_char
&& port
->ops
->poll_put_char
))
2199 if (port
->ops
->poll_init
) {
2200 struct tty_port
*tport
= &state
->port
;
2203 mutex_lock(&tport
->mutex
);
2205 * We don't set ASYNCB_INITIALIZED as we only initialized the
2206 * hw, e.g. state->xmit is still uninitialized.
2208 if (!test_bit(ASYNCB_INITIALIZED
, &tport
->flags
))
2209 ret
= port
->ops
->poll_init(port
);
2210 mutex_unlock(&tport
->mutex
);
2216 uart_parse_options(options
, &baud
, &parity
, &bits
, &flow
);
2217 return uart_set_options(port
, NULL
, baud
, parity
, bits
, flow
);
2223 static int uart_poll_get_char(struct tty_driver
*driver
, int line
)
2225 struct uart_driver
*drv
= driver
->driver_state
;
2226 struct uart_state
*state
= drv
->state
+ line
;
2227 struct uart_port
*port
;
2229 if (!state
|| !state
->uart_port
)
2232 port
= state
->uart_port
;
2233 return port
->ops
->poll_get_char(port
);
2236 static void uart_poll_put_char(struct tty_driver
*driver
, int line
, char ch
)
2238 struct uart_driver
*drv
= driver
->driver_state
;
2239 struct uart_state
*state
= drv
->state
+ line
;
2240 struct uart_port
*port
;
2242 if (!state
|| !state
->uart_port
)
2245 port
= state
->uart_port
;
2246 port
->ops
->poll_put_char(port
, ch
);
2250 static const struct tty_operations uart_ops
= {
2252 .close
= uart_close
,
2253 .write
= uart_write
,
2254 .put_char
= uart_put_char
,
2255 .flush_chars
= uart_flush_chars
,
2256 .write_room
= uart_write_room
,
2257 .chars_in_buffer
= uart_chars_in_buffer
,
2258 .flush_buffer
= uart_flush_buffer
,
2259 .ioctl
= uart_ioctl
,
2260 .throttle
= uart_throttle
,
2261 .unthrottle
= uart_unthrottle
,
2262 .send_xchar
= uart_send_xchar
,
2263 .set_termios
= uart_set_termios
,
2264 .set_ldisc
= uart_set_ldisc
,
2266 .start
= uart_start
,
2267 .hangup
= uart_hangup
,
2268 .break_ctl
= uart_break_ctl
,
2269 .wait_until_sent
= uart_wait_until_sent
,
2270 #ifdef CONFIG_PROC_FS
2271 .proc_fops
= &uart_proc_fops
,
2273 .tiocmget
= uart_tiocmget
,
2274 .tiocmset
= uart_tiocmset
,
2275 .get_icount
= uart_get_icount
,
2276 #ifdef CONFIG_CONSOLE_POLL
2277 .poll_init
= uart_poll_init
,
2278 .poll_get_char
= uart_poll_get_char
,
2279 .poll_put_char
= uart_poll_put_char
,
2283 static const struct tty_port_operations uart_port_ops
= {
2284 .activate
= uart_port_activate
,
2285 .shutdown
= uart_port_shutdown
,
2286 .carrier_raised
= uart_carrier_raised
,
2287 .dtr_rts
= uart_dtr_rts
,
2291 * uart_register_driver - register a driver with the uart core layer
2292 * @drv: low level driver structure
2294 * Register a uart driver with the core driver. We in turn register
2295 * with the tty layer, and initialise the core driver per-port state.
2297 * We have a proc file in /proc/tty/driver which is named after the
2300 * drv->port should be NULL, and the per-port structures should be
2301 * registered using uart_add_one_port after this call has succeeded.
2303 int uart_register_driver(struct uart_driver
*drv
)
2305 struct tty_driver
*normal
;
2311 * Maybe we should be using a slab cache for this, especially if
2312 * we have a large number of ports to handle.
2314 drv
->state
= kzalloc(sizeof(struct uart_state
) * drv
->nr
, GFP_KERNEL
);
2318 normal
= alloc_tty_driver(drv
->nr
);
2322 drv
->tty_driver
= normal
;
2324 normal
->driver_name
= drv
->driver_name
;
2325 normal
->name
= drv
->dev_name
;
2326 normal
->major
= drv
->major
;
2327 normal
->minor_start
= drv
->minor
;
2328 normal
->type
= TTY_DRIVER_TYPE_SERIAL
;
2329 normal
->subtype
= SERIAL_TYPE_NORMAL
;
2330 normal
->init_termios
= tty_std_termios
;
2331 normal
->init_termios
.c_cflag
= B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
2332 normal
->init_termios
.c_ispeed
= normal
->init_termios
.c_ospeed
= 9600;
2333 normal
->flags
= TTY_DRIVER_REAL_RAW
| TTY_DRIVER_DYNAMIC_DEV
;
2334 normal
->driver_state
= drv
;
2335 tty_set_operations(normal
, &uart_ops
);
2338 * Initialise the UART state(s).
2340 for (i
= 0; i
< drv
->nr
; i
++) {
2341 struct uart_state
*state
= drv
->state
+ i
;
2342 struct tty_port
*port
= &state
->port
;
2344 tty_port_init(port
);
2345 port
->ops
= &uart_port_ops
;
2346 port
->close_delay
= HZ
/ 2; /* .5 seconds */
2347 port
->closing_wait
= 30 * HZ
;/* 30 seconds */
2350 retval
= tty_register_driver(normal
);
2354 for (i
= 0; i
< drv
->nr
; i
++)
2355 tty_port_destroy(&drv
->state
[i
].port
);
2356 put_tty_driver(normal
);
2364 * uart_unregister_driver - remove a driver from the uart core layer
2365 * @drv: low level driver structure
2367 * Remove all references to a driver from the core driver. The low
2368 * level driver must have removed all its ports via the
2369 * uart_remove_one_port() if it registered them with uart_add_one_port().
2370 * (ie, drv->port == NULL)
2372 void uart_unregister_driver(struct uart_driver
*drv
)
2374 struct tty_driver
*p
= drv
->tty_driver
;
2377 tty_unregister_driver(p
);
2379 for (i
= 0; i
< drv
->nr
; i
++)
2380 tty_port_destroy(&drv
->state
[i
].port
);
2383 drv
->tty_driver
= NULL
;
2386 struct tty_driver
*uart_console_device(struct console
*co
, int *index
)
2388 struct uart_driver
*p
= co
->data
;
2390 return p
->tty_driver
;
2393 static ssize_t
uart_get_attr_uartclk(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
.baud_base
* 16);
2403 static ssize_t
uart_get_attr_type(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
.type
);
2412 static ssize_t
uart_get_attr_line(struct device
*dev
,
2413 struct device_attribute
*attr
, char *buf
)
2415 struct serial_struct tmp
;
2416 struct tty_port
*port
= dev_get_drvdata(dev
);
2418 uart_get_info(port
, &tmp
);
2419 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.line
);
2422 static ssize_t
uart_get_attr_port(struct device
*dev
,
2423 struct device_attribute
*attr
, char *buf
)
2425 struct serial_struct tmp
;
2426 struct tty_port
*port
= dev_get_drvdata(dev
);
2427 unsigned long ioaddr
;
2429 uart_get_info(port
, &tmp
);
2431 if (HIGH_BITS_OFFSET
)
2432 ioaddr
|= (unsigned long)tmp
.port_high
<< HIGH_BITS_OFFSET
;
2433 return snprintf(buf
, PAGE_SIZE
, "0x%lX\n", ioaddr
);
2436 static ssize_t
uart_get_attr_irq(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
, "%d\n", tmp
.irq
);
2446 static ssize_t
uart_get_attr_flags(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
, "0x%X\n", tmp
.flags
);
2456 static ssize_t
uart_get_attr_xmit_fifo_size(struct device
*dev
,
2457 struct device_attribute
*attr
, char *buf
)
2459 struct serial_struct tmp
;
2460 struct tty_port
*port
= dev_get_drvdata(dev
);
2462 uart_get_info(port
, &tmp
);
2463 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.xmit_fifo_size
);
2467 static ssize_t
uart_get_attr_close_delay(struct device
*dev
,
2468 struct device_attribute
*attr
, char *buf
)
2470 struct serial_struct tmp
;
2471 struct tty_port
*port
= dev_get_drvdata(dev
);
2473 uart_get_info(port
, &tmp
);
2474 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.close_delay
);
2478 static ssize_t
uart_get_attr_closing_wait(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
.closing_wait
);
2488 static ssize_t
uart_get_attr_custom_divisor(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
.custom_divisor
);
2498 static ssize_t
uart_get_attr_io_type(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
, "%d\n", tmp
.io_type
);
2508 static ssize_t
uart_get_attr_iomem_base(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
, "0x%lX\n", (unsigned long)tmp
.iomem_base
);
2518 static ssize_t
uart_get_attr_iomem_reg_shift(struct device
*dev
,
2519 struct device_attribute
*attr
, char *buf
)
2521 struct serial_struct tmp
;
2522 struct tty_port
*port
= dev_get_drvdata(dev
);
2524 uart_get_info(port
, &tmp
);
2525 return snprintf(buf
, PAGE_SIZE
, "%d\n", tmp
.iomem_reg_shift
);
2528 static DEVICE_ATTR(type
, S_IRUSR
| S_IRGRP
, uart_get_attr_type
, NULL
);
2529 static DEVICE_ATTR(line
, S_IRUSR
| S_IRGRP
, uart_get_attr_line
, NULL
);
2530 static DEVICE_ATTR(port
, S_IRUSR
| S_IRGRP
, uart_get_attr_port
, NULL
);
2531 static DEVICE_ATTR(irq
, S_IRUSR
| S_IRGRP
, uart_get_attr_irq
, NULL
);
2532 static DEVICE_ATTR(flags
, S_IRUSR
| S_IRGRP
, uart_get_attr_flags
, NULL
);
2533 static DEVICE_ATTR(xmit_fifo_size
, S_IRUSR
| S_IRGRP
, uart_get_attr_xmit_fifo_size
, NULL
);
2534 static DEVICE_ATTR(uartclk
, S_IRUSR
| S_IRGRP
, uart_get_attr_uartclk
, NULL
);
2535 static DEVICE_ATTR(close_delay
, S_IRUSR
| S_IRGRP
, uart_get_attr_close_delay
, NULL
);
2536 static DEVICE_ATTR(closing_wait
, S_IRUSR
| S_IRGRP
, uart_get_attr_closing_wait
, NULL
);
2537 static DEVICE_ATTR(custom_divisor
, S_IRUSR
| S_IRGRP
, uart_get_attr_custom_divisor
, NULL
);
2538 static DEVICE_ATTR(io_type
, S_IRUSR
| S_IRGRP
, uart_get_attr_io_type
, NULL
);
2539 static DEVICE_ATTR(iomem_base
, S_IRUSR
| S_IRGRP
, uart_get_attr_iomem_base
, NULL
);
2540 static DEVICE_ATTR(iomem_reg_shift
, S_IRUSR
| S_IRGRP
, uart_get_attr_iomem_reg_shift
, NULL
);
2542 static struct attribute
*tty_dev_attrs
[] = {
2543 &dev_attr_type
.attr
,
2544 &dev_attr_line
.attr
,
2545 &dev_attr_port
.attr
,
2547 &dev_attr_flags
.attr
,
2548 &dev_attr_xmit_fifo_size
.attr
,
2549 &dev_attr_uartclk
.attr
,
2550 &dev_attr_close_delay
.attr
,
2551 &dev_attr_closing_wait
.attr
,
2552 &dev_attr_custom_divisor
.attr
,
2553 &dev_attr_io_type
.attr
,
2554 &dev_attr_iomem_base
.attr
,
2555 &dev_attr_iomem_reg_shift
.attr
,
2559 static const struct attribute_group tty_dev_attr_group
= {
2560 .attrs
= tty_dev_attrs
,
2563 static const struct attribute_group
*tty_dev_attr_groups
[] = {
2564 &tty_dev_attr_group
,
2570 * uart_add_one_port - attach a driver-defined port structure
2571 * @drv: pointer to the uart low level driver structure for this port
2572 * @uport: uart port structure to use for this port.
2574 * This allows the driver to register its own uart_port structure
2575 * with the core driver. The main purpose is to allow the low
2576 * level uart drivers to expand uart_port, rather than having yet
2577 * more levels of structures.
2579 int uart_add_one_port(struct uart_driver
*drv
, struct uart_port
*uport
)
2581 struct uart_state
*state
;
2582 struct tty_port
*port
;
2584 struct device
*tty_dev
;
2586 BUG_ON(in_interrupt());
2588 if (uport
->line
>= drv
->nr
)
2591 state
= drv
->state
+ uport
->line
;
2592 port
= &state
->port
;
2594 mutex_lock(&port_mutex
);
2595 mutex_lock(&port
->mutex
);
2596 if (state
->uart_port
) {
2601 state
->uart_port
= uport
;
2602 state
->pm_state
= UART_PM_STATE_UNDEFINED
;
2604 uport
->cons
= drv
->cons
;
2605 uport
->state
= state
;
2608 * If this port is a console, then the spinlock is already
2611 if (!(uart_console(uport
) && (uport
->cons
->flags
& CON_ENABLED
))) {
2612 spin_lock_init(&uport
->lock
);
2613 lockdep_set_class(&uport
->lock
, &port_lock_key
);
2616 uart_configure_port(drv
, state
, uport
);
2619 * Register the port whether it's detected or not. This allows
2620 * setserial to be used to alter this ports parameters.
2622 tty_dev
= tty_port_register_device_attr(port
, drv
->tty_driver
,
2623 uport
->line
, uport
->dev
, port
, tty_dev_attr_groups
);
2624 if (likely(!IS_ERR(tty_dev
))) {
2625 device_set_wakeup_capable(tty_dev
, 1);
2627 printk(KERN_ERR
"Cannot register tty device on line %d\n",
2632 * Ensure UPF_DEAD is not set.
2634 uport
->flags
&= ~UPF_DEAD
;
2637 mutex_unlock(&port
->mutex
);
2638 mutex_unlock(&port_mutex
);
2644 * uart_remove_one_port - detach a driver defined port structure
2645 * @drv: pointer to the uart low level driver structure for this port
2646 * @uport: uart port structure for this port
2648 * This unhooks (and hangs up) the specified port structure from the
2649 * core driver. No further calls will be made to the low-level code
2652 int uart_remove_one_port(struct uart_driver
*drv
, struct uart_port
*uport
)
2654 struct uart_state
*state
= drv
->state
+ uport
->line
;
2655 struct tty_port
*port
= &state
->port
;
2658 BUG_ON(in_interrupt());
2660 if (state
->uart_port
!= uport
)
2661 printk(KERN_ALERT
"Removing wrong port: %p != %p\n",
2662 state
->uart_port
, uport
);
2664 mutex_lock(&port_mutex
);
2667 * Mark the port "dead" - this prevents any opens from
2668 * succeeding while we shut down the port.
2670 mutex_lock(&port
->mutex
);
2671 if (!state
->uart_port
) {
2672 mutex_unlock(&port
->mutex
);
2676 uport
->flags
|= UPF_DEAD
;
2677 mutex_unlock(&port
->mutex
);
2680 * Remove the devices from the tty layer
2682 tty_unregister_device(drv
->tty_driver
, uport
->line
);
2685 tty_vhangup(port
->tty
);
2688 * Free the port IO and memory resources, if any.
2690 if (uport
->type
!= PORT_UNKNOWN
)
2691 uport
->ops
->release_port(uport
);
2694 * Indicate that there isn't a port here anymore.
2696 uport
->type
= PORT_UNKNOWN
;
2698 state
->uart_port
= NULL
;
2700 mutex_unlock(&port_mutex
);
2706 * Are the two ports equivalent?
2708 int uart_match_port(struct uart_port
*port1
, struct uart_port
*port2
)
2710 if (port1
->iotype
!= port2
->iotype
)
2713 switch (port1
->iotype
) {
2715 return (port1
->iobase
== port2
->iobase
);
2717 return (port1
->iobase
== port2
->iobase
) &&
2718 (port1
->hub6
== port2
->hub6
);
2723 return (port1
->mapbase
== port2
->mapbase
);
2727 EXPORT_SYMBOL(uart_match_port
);
2730 * uart_handle_dcd_change - handle a change of carrier detect state
2731 * @uport: uart_port structure for the open port
2732 * @status: new carrier detect status, nonzero if active
2734 void uart_handle_dcd_change(struct uart_port
*uport
, unsigned int status
)
2736 struct tty_port
*port
= &uport
->state
->port
;
2737 struct tty_struct
*tty
= port
->tty
;
2738 struct tty_ldisc
*ld
= tty
? tty_ldisc_ref(tty
) : NULL
;
2741 if (ld
->ops
->dcd_change
)
2742 ld
->ops
->dcd_change(tty
, status
);
2743 tty_ldisc_deref(ld
);
2746 uport
->icount
.dcd
++;
2748 if (port
->flags
& ASYNC_CHECK_CD
) {
2750 wake_up_interruptible(&port
->open_wait
);
2755 EXPORT_SYMBOL_GPL(uart_handle_dcd_change
);
2758 * uart_handle_cts_change - handle a change of clear-to-send state
2759 * @uport: uart_port structure for the open port
2760 * @status: new clear to send status, nonzero if active
2762 void uart_handle_cts_change(struct uart_port
*uport
, unsigned int status
)
2764 struct tty_port
*port
= &uport
->state
->port
;
2765 struct tty_struct
*tty
= port
->tty
;
2767 uport
->icount
.cts
++;
2769 if (tty_port_cts_enabled(port
)) {
2770 if (tty
->hw_stopped
) {
2772 tty
->hw_stopped
= 0;
2773 uport
->ops
->start_tx(uport
);
2774 uart_write_wakeup(uport
);
2778 tty
->hw_stopped
= 1;
2779 uport
->ops
->stop_tx(uport
);
2784 EXPORT_SYMBOL_GPL(uart_handle_cts_change
);
2787 * uart_insert_char - push a char to the uart layer
2789 * User is responsible to call tty_flip_buffer_push when they are done with
2792 * @port: corresponding port
2793 * @status: state of the serial port RX buffer (LSR for 8250)
2794 * @overrun: mask of overrun bits in @status
2795 * @ch: character to push
2796 * @flag: flag for the character (see TTY_NORMAL and friends)
2798 void uart_insert_char(struct uart_port
*port
, unsigned int status
,
2799 unsigned int overrun
, unsigned int ch
, unsigned int flag
)
2801 struct tty_port
*tport
= &port
->state
->port
;
2803 if ((status
& port
->ignore_status_mask
& ~overrun
) == 0)
2804 if (tty_insert_flip_char(tport
, ch
, flag
) == 0)
2805 ++port
->icount
.buf_overrun
;
2808 * Overrun is special. Since it's reported immediately,
2809 * it doesn't affect the current character.
2811 if (status
& ~port
->ignore_status_mask
& overrun
)
2812 if (tty_insert_flip_char(tport
, 0, TTY_OVERRUN
) == 0)
2813 ++port
->icount
.buf_overrun
;
2815 EXPORT_SYMBOL_GPL(uart_insert_char
);
2817 EXPORT_SYMBOL(uart_write_wakeup
);
2818 EXPORT_SYMBOL(uart_register_driver
);
2819 EXPORT_SYMBOL(uart_unregister_driver
);
2820 EXPORT_SYMBOL(uart_suspend_port
);
2821 EXPORT_SYMBOL(uart_resume_port
);
2822 EXPORT_SYMBOL(uart_add_one_port
);
2823 EXPORT_SYMBOL(uart_remove_one_port
);
2825 MODULE_DESCRIPTION("Serial driver core");
2826 MODULE_LICENSE("GPL");