2 * Simulated Serial Driver (fake serial)
4 * This driver is mostly used for bringup purposes and will go away.
5 * It has a strong dependency on the system console. All outputs
6 * are rerouted to the same facility as the one used by printk which, in our
7 * case means sys_sim.c console (goes via the simulator). The code hereafter
8 * is completely leveraged from the serial.c driver.
10 * Copyright (C) 1999-2000, 2002-2003 Hewlett-Packard Co
11 * Stephane Eranian <eranian@hpl.hp.com>
12 * David Mosberger-Tang <davidm@hpl.hp.com>
14 * 02/04/00 D. Mosberger Merged in serial.c bug fixes in rs_close().
15 * 02/25/00 D. Mosberger Synced up with 2.3.99pre-5 version of serial.c.
16 * 07/30/02 D. Mosberger Replace sti()/cli() with explicit spinlocks & local irq masking
19 #include <linux/config.h>
20 #include <linux/init.h>
21 #include <linux/errno.h>
22 #include <linux/sched.h>
23 #include <linux/tty.h>
24 #include <linux/tty_flip.h>
25 #include <linux/major.h>
26 #include <linux/fcntl.h>
28 #include <linux/slab.h>
29 #include <linux/capability.h>
30 #include <linux/console.h>
31 #include <linux/module.h>
32 #include <linux/serial.h>
33 #include <linux/serialP.h>
34 #include <linux/sysrq.h>
37 #include <asm/hw_irq.h>
38 #include <asm/uaccess.h>
41 # include <linux/kdb.h>
44 #undef SIMSERIAL_DEBUG /* define this to get some debug information */
46 #define KEYBOARD_INTR 3 /* must match with simulator! */
48 #define NR_PORTS 1 /* only one port for now */
50 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? SA_SHIRQ : SA_INTERRUPT)
52 #define SSC_GETCHAR 21
54 extern long ia64_ssc (long, long, long, long, int);
55 extern void ia64_ssc_connect_irq (long intr
, long irq
);
57 static char *serial_name
= "SimSerial driver";
58 static char *serial_version
= "0.6";
61 * This has been extracted from asm/serial.h. We need one eventually but
62 * I don't know exactly what we're going to put in it so just fake one
65 #define BASE_BAUD ( 1843200 / 16 )
67 #define STD_COM_FLAGS (ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST)
70 * Most of the values here are meaningless to this particular driver.
71 * However some values must be preserved for the code (leveraged from serial.c
74 * type must not be UNKNOWN
75 * So I picked arbitrary (guess from where?) values instead
77 static struct serial_state rs_table
[NR_PORTS
]={
78 /* UART CLK PORT IRQ FLAGS */
79 { 0, BASE_BAUD
, 0x3F8, 0, STD_COM_FLAGS
,0,PORT_16550
} /* ttyS0 */
83 * Just for the fun of it !
85 static struct serial_uart_config uart_config
[] = {
90 { "16550A", 16, UART_CLEAR_FIFO
| UART_USE_FIFO
},
92 { "ST16650", 1, UART_CLEAR_FIFO
| UART_STARTECH
},
93 { "ST16650V2", 32, UART_CLEAR_FIFO
| UART_USE_FIFO
|
95 { "TI16750", 64, UART_CLEAR_FIFO
| UART_USE_FIFO
},
99 struct tty_driver
*hp_simserial_driver
;
101 static struct async_struct
*IRQ_ports
[NR_IRQS
];
103 static struct console
*console
;
105 static unsigned char *tmp_buf
;
107 extern struct console
*console_drivers
; /* from kernel/printk.c */
110 * ------------------------------------------------------------
111 * rs_stop() and rs_start()
113 * This routines are called before setting or resetting tty->stopped.
114 * They enable or disable transmitter interrupts, as necessary.
115 * ------------------------------------------------------------
117 static void rs_stop(struct tty_struct
*tty
)
119 #ifdef SIMSERIAL_DEBUG
120 printk("rs_stop: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
121 tty
->stopped
, tty
->hw_stopped
, tty
->flow_stopped
);
126 static void rs_start(struct tty_struct
*tty
)
128 #ifdef SIMSERIAL_DEBUG
129 printk("rs_start: tty->stopped=%d tty->hw_stopped=%d tty->flow_stopped=%d\n",
130 tty
->stopped
, tty
->hw_stopped
, tty
->flow_stopped
);
134 static void receive_chars(struct tty_struct
*tty
, struct pt_regs
*regs
)
137 static unsigned char seen_esc
= 0;
139 while ( (ch
= ia64_ssc(0, 0, 0, 0, SSC_GETCHAR
)) ) {
140 if ( ch
== 27 && seen_esc
== 0 ) {
144 if ( seen_esc
==1 && ch
== 'O' ) {
147 } else if ( seen_esc
== 2 ) {
148 if ( ch
== 'P' ) /* F1 */
150 #ifdef CONFIG_MAGIC_SYSRQ
151 if ( ch
== 'S' ) { /* F4 */
153 ch
= ia64_ssc(0, 0, 0, 0,
156 handle_sysrq(ch
, regs
, NULL
);
165 if (tty_insert_flip_char(tty
, ch
, TTY_NORMAL
) == 0)
168 tty_flip_buffer_push(tty
);
172 * This is the serial driver's interrupt routine for a single port
174 static irqreturn_t
rs_interrupt_single(int irq
, void *dev_id
, struct pt_regs
* regs
)
176 struct async_struct
* info
;
179 * I don't know exactly why they don't use the dev_id opaque data
180 * pointer instead of this extra lookup table
182 info
= IRQ_ports
[irq
];
183 if (!info
|| !info
->tty
) {
184 printk(KERN_INFO
"simrs_interrupt_single: info|tty=0 info=%p problem\n", info
);
188 * pretty simple in our case, because we only get interrupts
191 receive_chars(info
->tty
, regs
);
196 * -------------------------------------------------------------------
197 * Here ends the serial interrupt routines.
198 * -------------------------------------------------------------------
203 * not really used in our situation so keep them commented out for now
205 static DECLARE_TASK_QUEUE(tq_serial
); /* used to be at the top of the file */
206 static void do_serial_bh(void)
208 run_task_queue(&tq_serial
);
209 printk(KERN_ERR
"do_serial_bh: called\n");
213 static void do_softint(void *private_
)
215 printk(KERN_ERR
"simserial: do_softint called\n");
218 static void rs_put_char(struct tty_struct
*tty
, unsigned char ch
)
220 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
223 if (!tty
|| !info
->xmit
.buf
) return;
225 local_irq_save(flags
);
226 if (CIRC_SPACE(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
) == 0) {
227 local_irq_restore(flags
);
230 info
->xmit
.buf
[info
->xmit
.head
] = ch
;
231 info
->xmit
.head
= (info
->xmit
.head
+ 1) & (SERIAL_XMIT_SIZE
-1);
232 local_irq_restore(flags
);
235 static void transmit_chars(struct async_struct
*info
, int *intr_done
)
241 local_irq_save(flags
);
244 char c
= info
->x_char
;
246 console
->write(console
, &c
, 1);
248 info
->state
->icount
.tx
++;
254 if (info
->xmit
.head
== info
->xmit
.tail
|| info
->tty
->stopped
|| info
->tty
->hw_stopped
) {
255 #ifdef SIMSERIAL_DEBUG
256 printk("transmit_chars: head=%d, tail=%d, stopped=%d\n",
257 info
->xmit
.head
, info
->xmit
.tail
, info
->tty
->stopped
);
262 * We removed the loop and try to do it in to chunks. We need
263 * 2 operations maximum because it's a ring buffer.
265 * First from current to tail if possible.
266 * Then from the beginning of the buffer until necessary
269 count
= min(CIRC_CNT(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
),
270 SERIAL_XMIT_SIZE
- info
->xmit
.tail
);
271 console
->write(console
, info
->xmit
.buf
+info
->xmit
.tail
, count
);
273 info
->xmit
.tail
= (info
->xmit
.tail
+count
) & (SERIAL_XMIT_SIZE
-1);
276 * We have more at the beginning of the buffer
278 count
= CIRC_CNT(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
280 console
->write(console
, info
->xmit
.buf
, count
);
281 info
->xmit
.tail
+= count
;
284 local_irq_restore(flags
);
287 static void rs_flush_chars(struct tty_struct
*tty
)
289 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
291 if (info
->xmit
.head
== info
->xmit
.tail
|| tty
->stopped
|| tty
->hw_stopped
||
295 transmit_chars(info
, NULL
);
299 static int rs_write(struct tty_struct
* tty
,
300 const unsigned char *buf
, int count
)
303 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
306 if (!tty
|| !info
->xmit
.buf
|| !tmp_buf
) return 0;
308 local_irq_save(flags
);
310 c
= CIRC_SPACE_TO_END(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
316 memcpy(info
->xmit
.buf
+ info
->xmit
.head
, buf
, c
);
317 info
->xmit
.head
= ((info
->xmit
.head
+ c
) &
318 (SERIAL_XMIT_SIZE
-1));
323 local_irq_restore(flags
);
325 * Hey, we transmit directly from here in our case
327 if (CIRC_CNT(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
)
328 && !tty
->stopped
&& !tty
->hw_stopped
) {
329 transmit_chars(info
, NULL
);
334 static int rs_write_room(struct tty_struct
*tty
)
336 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
338 return CIRC_SPACE(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
341 static int rs_chars_in_buffer(struct tty_struct
*tty
)
343 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
345 return CIRC_CNT(info
->xmit
.head
, info
->xmit
.tail
, SERIAL_XMIT_SIZE
);
348 static void rs_flush_buffer(struct tty_struct
*tty
)
350 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
353 local_irq_save(flags
);
354 info
->xmit
.head
= info
->xmit
.tail
= 0;
355 local_irq_restore(flags
);
357 wake_up_interruptible(&tty
->write_wait
);
359 if ((tty
->flags
& (1 << TTY_DO_WRITE_WAKEUP
)) &&
360 tty
->ldisc
.write_wakeup
)
361 (tty
->ldisc
.write_wakeup
)(tty
);
365 * This function is used to send a high-priority XON/XOFF character to
368 static void rs_send_xchar(struct tty_struct
*tty
, char ch
)
370 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
375 * I guess we could call console->write() directly but
376 * let's do that for now.
378 transmit_chars(info
, NULL
);
383 * ------------------------------------------------------------
386 * This routine is called by the upper-layer tty layer to signal that
387 * incoming characters should be throttled.
388 * ------------------------------------------------------------
390 static void rs_throttle(struct tty_struct
* tty
)
392 if (I_IXOFF(tty
)) rs_send_xchar(tty
, STOP_CHAR(tty
));
394 printk(KERN_INFO
"simrs_throttle called\n");
397 static void rs_unthrottle(struct tty_struct
* tty
)
399 struct async_struct
*info
= (struct async_struct
*)tty
->driver_data
;
405 rs_send_xchar(tty
, START_CHAR(tty
));
407 printk(KERN_INFO
"simrs_unthrottle called\n");
411 * rs_break() --- routine which turns the break handling on or off
413 static void rs_break(struct tty_struct
*tty
, int break_state
)
417 static int rs_ioctl(struct tty_struct
*tty
, struct file
* file
,
418 unsigned int cmd
, unsigned long arg
)
420 if ((cmd
!= TIOCGSERIAL
) && (cmd
!= TIOCSSERIAL
) &&
421 (cmd
!= TIOCSERCONFIG
) && (cmd
!= TIOCSERGSTRUCT
) &&
422 (cmd
!= TIOCMIWAIT
) && (cmd
!= TIOCGICOUNT
)) {
423 if (tty
->flags
& (1 << TTY_IO_ERROR
))
429 printk(KERN_INFO
"rs_ioctl: TIOCMGET called\n");
434 printk(KERN_INFO
"rs_ioctl: TIOCMBIS/BIC/SET called\n");
437 printk(KERN_INFO
"simrs_ioctl TIOCGSERIAL called\n");
440 printk(KERN_INFO
"simrs_ioctl TIOCSSERIAL called\n");
443 printk(KERN_INFO
"rs_ioctl: TIOCSERCONFIG called\n");
446 case TIOCSERGETLSR
: /* Get line status register */
447 printk(KERN_INFO
"rs_ioctl: TIOCSERGETLSR called\n");
451 printk(KERN_INFO
"rs_ioctl: TIOCSERGSTRUCT called\n");
453 if (copy_to_user((struct async_struct
*) arg
,
454 info
, sizeof(struct async_struct
)))
460 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
461 * - mask passed in arg for lines of interest
462 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
463 * Caller should use TIOCGICOUNT to see which one it was
466 printk(KERN_INFO
"rs_ioctl: TIOCMIWAIT: called\n");
469 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
470 * Return: write counters to the user passed counter struct
471 * NB: both 1->0 and 0->1 transitions are counted except for
472 * RI where only 0->1 is counted.
475 printk(KERN_INFO
"rs_ioctl: TIOCGICOUNT called\n");
480 /* "setserial -W" is called in Debian boot */
481 printk (KERN_INFO
"TIOCSER?WILD ioctl obsolete, ignored.\n");
490 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
492 static void rs_set_termios(struct tty_struct
*tty
, struct termios
*old_termios
)
494 unsigned int cflag
= tty
->termios
->c_cflag
;
496 if ( (cflag
== old_termios
->c_cflag
)
497 && ( RELEVANT_IFLAG(tty
->termios
->c_iflag
)
498 == RELEVANT_IFLAG(old_termios
->c_iflag
)))
502 /* Handle turning off CRTSCTS */
503 if ((old_termios
->c_cflag
& CRTSCTS
) &&
504 !(tty
->termios
->c_cflag
& CRTSCTS
)) {
510 * This routine will shutdown a serial port; interrupts are disabled, and
511 * DTR is dropped if the hangup on close termio flag is on.
513 static void shutdown(struct async_struct
* info
)
516 struct serial_state
*state
;
519 if (!(info
->flags
& ASYNC_INITIALIZED
)) return;
523 #ifdef SIMSERIAL_DEBUG
524 printk("Shutting down serial port %d (irq %d)....", info
->line
,
528 local_irq_save(flags
);
531 * First unlink the serial port from the IRQ chain...
534 info
->next_port
->prev_port
= info
->prev_port
;
536 info
->prev_port
->next_port
= info
->next_port
;
538 IRQ_ports
[state
->irq
] = info
->next_port
;
541 * Free the IRQ, if necessary
543 if (state
->irq
&& (!IRQ_ports
[state
->irq
] ||
544 !IRQ_ports
[state
->irq
]->next_port
)) {
545 if (IRQ_ports
[state
->irq
]) {
546 free_irq(state
->irq
, NULL
);
547 retval
= request_irq(state
->irq
, rs_interrupt_single
,
548 IRQ_T(info
), "serial", NULL
);
551 printk(KERN_ERR
"serial shutdown: request_irq: error %d"
552 " Couldn't reacquire IRQ.\n", retval
);
554 free_irq(state
->irq
, NULL
);
557 if (info
->xmit
.buf
) {
558 free_page((unsigned long) info
->xmit
.buf
);
562 if (info
->tty
) set_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
564 info
->flags
&= ~ASYNC_INITIALIZED
;
566 local_irq_restore(flags
);
570 * ------------------------------------------------------------
573 * This routine is called when the serial port gets closed. First, we
574 * wait for the last remaining data to be sent. Then, we unlink its
575 * async structure from the interrupt chain if necessary, and we free
576 * that IRQ if nothing is left in the chain.
577 * ------------------------------------------------------------
579 static void rs_close(struct tty_struct
*tty
, struct file
* filp
)
581 struct async_struct
* info
= (struct async_struct
*)tty
->driver_data
;
582 struct serial_state
*state
;
589 local_irq_save(flags
);
590 if (tty_hung_up_p(filp
)) {
591 #ifdef SIMSERIAL_DEBUG
592 printk("rs_close: hung_up\n");
594 local_irq_restore(flags
);
597 #ifdef SIMSERIAL_DEBUG
598 printk("rs_close ttys%d, count = %d\n", info
->line
, state
->count
);
600 if ((tty
->count
== 1) && (state
->count
!= 1)) {
602 * Uh, oh. tty->count is 1, which means that the tty
603 * structure will be freed. state->count should always
604 * be one in these conditions. If it's greater than
605 * one, we've got real problems, since it means the
606 * serial port won't be shutdown.
608 printk(KERN_ERR
"rs_close: bad serial port count; tty->count is 1, "
609 "state->count is %d\n", state
->count
);
612 if (--state
->count
< 0) {
613 printk(KERN_ERR
"rs_close: bad serial port count for ttys%d: %d\n",
614 info
->line
, state
->count
);
618 local_irq_restore(flags
);
621 info
->flags
|= ASYNC_CLOSING
;
622 local_irq_restore(flags
);
625 * Now we wait for the transmit buffer to clear; and we notify
626 * the line discipline to only process XON/XOFF characters.
629 if (tty
->driver
->flush_buffer
) tty
->driver
->flush_buffer(tty
);
630 if (tty
->ldisc
.flush_buffer
) tty
->ldisc
.flush_buffer(tty
);
633 if (info
->blocked_open
) {
634 if (info
->close_delay
)
635 schedule_timeout_interruptible(info
->close_delay
);
636 wake_up_interruptible(&info
->open_wait
);
638 info
->flags
&= ~(ASYNC_NORMAL_ACTIVE
|ASYNC_CLOSING
);
639 wake_up_interruptible(&info
->close_wait
);
643 * rs_wait_until_sent() --- wait until the transmitter is empty
645 static void rs_wait_until_sent(struct tty_struct
*tty
, int timeout
)
651 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
653 static void rs_hangup(struct tty_struct
*tty
)
655 struct async_struct
* info
= (struct async_struct
*)tty
->driver_data
;
656 struct serial_state
*state
= info
->state
;
658 #ifdef SIMSERIAL_DEBUG
659 printk("rs_hangup: called\n");
664 rs_flush_buffer(tty
);
665 if (info
->flags
& ASYNC_CLOSING
)
671 info
->flags
&= ~ASYNC_NORMAL_ACTIVE
;
673 wake_up_interruptible(&info
->open_wait
);
677 static int get_async_struct(int line
, struct async_struct
**ret_info
)
679 struct async_struct
*info
;
680 struct serial_state
*sstate
;
682 sstate
= rs_table
+ line
;
685 *ret_info
= sstate
->info
;
688 info
= kmalloc(sizeof(struct async_struct
), GFP_KERNEL
);
693 memset(info
, 0, sizeof(struct async_struct
));
694 init_waitqueue_head(&info
->open_wait
);
695 init_waitqueue_head(&info
->close_wait
);
696 init_waitqueue_head(&info
->delta_msr_wait
);
697 info
->magic
= SERIAL_MAGIC
;
698 info
->port
= sstate
->port
;
699 info
->flags
= sstate
->flags
;
700 info
->xmit_fifo_size
= sstate
->xmit_fifo_size
;
702 INIT_WORK(&info
->work
, do_softint
, info
);
703 info
->state
= sstate
;
706 *ret_info
= sstate
->info
;
709 *ret_info
= sstate
->info
= info
;
714 startup(struct async_struct
*info
)
718 irqreturn_t (*handler
)(int, void *, struct pt_regs
*);
719 struct serial_state
*state
= info
->state
;
722 page
= get_zeroed_page(GFP_KERNEL
);
726 local_irq_save(flags
);
728 if (info
->flags
& ASYNC_INITIALIZED
) {
733 if (!state
->port
|| !state
->type
) {
734 if (info
->tty
) set_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
741 info
->xmit
.buf
= (unsigned char *) page
;
743 #ifdef SIMSERIAL_DEBUG
744 printk("startup: ttys%d (irq %d)...", info
->line
, state
->irq
);
748 * Allocate the IRQ if necessary
750 if (state
->irq
&& (!IRQ_ports
[state
->irq
] ||
751 !IRQ_ports
[state
->irq
]->next_port
)) {
752 if (IRQ_ports
[state
->irq
]) {
756 handler
= rs_interrupt_single
;
758 retval
= request_irq(state
->irq
, handler
, IRQ_T(info
), "simserial", NULL
);
760 if (capable(CAP_SYS_ADMIN
)) {
762 set_bit(TTY_IO_ERROR
,
771 * Insert serial port into IRQ chain.
774 info
->next_port
= IRQ_ports
[state
->irq
];
776 info
->next_port
->prev_port
= info
;
777 IRQ_ports
[state
->irq
] = info
;
779 if (info
->tty
) clear_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
781 info
->xmit
.head
= info
->xmit
.tail
= 0;
785 * Set up serial timers...
787 timer_table
[RS_TIMER
].expires
= jiffies
+ 2*HZ
/100;
788 timer_active
|= 1 << RS_TIMER
;
792 * Set up the tty->alt_speed kludge
795 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_HI
)
796 info
->tty
->alt_speed
= 57600;
797 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_VHI
)
798 info
->tty
->alt_speed
= 115200;
799 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_SHI
)
800 info
->tty
->alt_speed
= 230400;
801 if ((info
->flags
& ASYNC_SPD_MASK
) == ASYNC_SPD_WARP
)
802 info
->tty
->alt_speed
= 460800;
805 info
->flags
|= ASYNC_INITIALIZED
;
806 local_irq_restore(flags
);
810 local_irq_restore(flags
);
816 * This routine is called whenever a serial port is opened. It
817 * enables interrupts for a serial port, linking in its async structure into
818 * the IRQ chain. It also performs the serial-specific
819 * initialization for the tty structure.
821 static int rs_open(struct tty_struct
*tty
, struct file
* filp
)
823 struct async_struct
*info
;
828 if ((line
< 0) || (line
>= NR_PORTS
))
830 retval
= get_async_struct(line
, &info
);
833 tty
->driver_data
= info
;
836 #ifdef SIMSERIAL_DEBUG
837 printk("rs_open %s, count = %d\n", tty
->name
, info
->state
->count
);
839 info
->tty
->low_latency
= (info
->flags
& ASYNC_LOW_LATENCY
) ? 1 : 0;
842 page
= get_zeroed_page(GFP_KERNEL
);
848 tmp_buf
= (unsigned char *) page
;
852 * If the port is the middle of closing, bail out now
854 if (tty_hung_up_p(filp
) ||
855 (info
->flags
& ASYNC_CLOSING
)) {
856 if (info
->flags
& ASYNC_CLOSING
)
857 interruptible_sleep_on(&info
->close_wait
);
858 #ifdef SERIAL_DO_RESTART
859 return ((info
->flags
& ASYNC_HUP_NOTIFY
) ?
860 -EAGAIN
: -ERESTARTSYS
);
867 * Start up serial port
869 retval
= startup(info
);
875 * figure out which console to use (should be one already)
877 console
= console_drivers
;
879 if ((console
->flags
& CON_ENABLED
) && console
->write
) break;
880 console
= console
->next
;
883 #ifdef SIMSERIAL_DEBUG
884 printk("rs_open ttys%d successful\n", info
->line
);
890 * /proc fs routines....
893 static inline int line_info(char *buf
, struct serial_state
*state
)
895 return sprintf(buf
, "%d: uart:%s port:%lX irq:%d\n",
896 state
->line
, uart_config
[state
->type
].name
,
897 state
->port
, state
->irq
);
900 static int rs_read_proc(char *page
, char **start
, off_t off
, int count
,
901 int *eof
, void *data
)
906 len
+= sprintf(page
, "simserinfo:1.0 driver:%s\n", serial_version
);
907 for (i
= 0; i
< NR_PORTS
&& len
< 4000; i
++) {
908 l
= line_info(page
+ len
, &rs_table
[i
]);
910 if (len
+begin
> off
+count
)
912 if (len
+begin
< off
) {
919 if (off
>= len
+begin
)
921 *start
= page
+ (begin
-off
);
922 return ((count
< begin
+len
-off
) ? count
: begin
+len
-off
);
926 * ---------------------------------------------------------------------
927 * rs_init() and friends
929 * rs_init() is called at boot-time to initialize the serial driver.
930 * ---------------------------------------------------------------------
934 * This routine prints out the appropriate serial driver version
935 * number, and identifies which options were configured into this
938 static inline void show_serial_version(void)
940 printk(KERN_INFO
"%s version %s with", serial_name
, serial_version
);
941 printk(KERN_INFO
" no serial options enabled\n");
944 static struct tty_operations hp_ops
= {
948 .put_char
= rs_put_char
,
949 .flush_chars
= rs_flush_chars
,
950 .write_room
= rs_write_room
,
951 .chars_in_buffer
= rs_chars_in_buffer
,
952 .flush_buffer
= rs_flush_buffer
,
954 .throttle
= rs_throttle
,
955 .unthrottle
= rs_unthrottle
,
956 .send_xchar
= rs_send_xchar
,
957 .set_termios
= rs_set_termios
,
961 .break_ctl
= rs_break
,
962 .wait_until_sent
= rs_wait_until_sent
,
963 .read_proc
= rs_read_proc
,
967 * The serial driver boot-time initialization code!
973 struct serial_state
*state
;
975 if (!ia64_platform_is("hpsim"))
978 hp_simserial_driver
= alloc_tty_driver(1);
979 if (!hp_simserial_driver
)
982 show_serial_version();
984 /* Initialize the tty_driver structure */
986 hp_simserial_driver
->owner
= THIS_MODULE
;
987 hp_simserial_driver
->driver_name
= "simserial";
988 hp_simserial_driver
->name
= "ttyS";
989 hp_simserial_driver
->major
= TTY_MAJOR
;
990 hp_simserial_driver
->minor_start
= 64;
991 hp_simserial_driver
->type
= TTY_DRIVER_TYPE_SERIAL
;
992 hp_simserial_driver
->subtype
= SERIAL_TYPE_NORMAL
;
993 hp_simserial_driver
->init_termios
= tty_std_termios
;
994 hp_simserial_driver
->init_termios
.c_cflag
=
995 B9600
| CS8
| CREAD
| HUPCL
| CLOCAL
;
996 hp_simserial_driver
->flags
= TTY_DRIVER_REAL_RAW
;
997 tty_set_operations(hp_simserial_driver
, &hp_ops
);
1000 * Let's have a little bit of fun !
1002 for (i
= 0, state
= rs_table
; i
< NR_PORTS
; i
++,state
++) {
1004 if (state
->type
== PORT_UNKNOWN
) continue;
1007 if ((rc
= assign_irq_vector(AUTO_ASSIGN
)) < 0)
1008 panic("%s: out of interrupt vectors!\n",
1011 ia64_ssc_connect_irq(KEYBOARD_INTR
, state
->irq
);
1014 printk(KERN_INFO
"ttyS%d at 0x%04lx (irq = %d) is a %s\n",
1016 state
->port
, state
->irq
,
1017 uart_config
[state
->type
].name
);
1020 if (tty_register_driver(hp_simserial_driver
))
1021 panic("Couldn't register simserial driver\n");
1027 __initcall(simrs_init
);