1 /* 68328serial.c: Serial port driver for 68328 microcontroller
3 * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
4 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
5 * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
6 * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
7 * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com>
8 * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
10 * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca>
11 * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au>
12 * Power management support Daniel Potts <danielp@cse.unsw.edu.au>
13 * VZ Second Serial Port enable Phil Wilshire
14 * 2.4/2.5 port David McCullough
18 #include <linux/module.h>
19 #include <linux/errno.h>
20 #include <linux/signal.h>
21 #include <linux/sched.h>
22 #include <linux/timer.h>
23 #include <linux/interrupt.h>
24 #include <linux/tty.h>
25 #include <linux/tty_flip.h>
26 #include <linux/config.h>
27 #include <linux/major.h>
28 #include <linux/string.h>
29 #include <linux/fcntl.h>
31 #include <linux/kernel.h>
32 #include <linux/console.h>
33 #include <linux/reboot.h>
34 #include <linux/keyboard.h>
35 #include <linux/init.h>
37 #include <linux/pm_legacy.h>
38 #include <linux/bitops.h>
39 #include <linux/delay.h>
43 #include <asm/system.h>
44 #include <asm/delay.h>
45 #include <asm/uaccess.h>
48 /* note: perhaps we can murge these files, so that you can just
49 * define 1 of them, and they can sort that out for themselves
51 #if defined(CONFIG_M68EZ328)
52 #include <asm/MC68EZ328.h>
54 #if defined(CONFIG_M68VZ328)
55 #include <asm/MC68VZ328.h>
57 #include <asm/MC68328.h>
58 #endif /* CONFIG_M68VZ328 */
59 #endif /* CONFIG_M68EZ328 */
61 #include "68328serial.h"
63 /* Turn off usage of real serial interrupt code, to "support" Copilot */
64 #ifdef CONFIG_XCOPILOT_BUGS
70 static struct m68k_serial m68k_soft
[NR_PORTS
];
71 struct m68k_serial
*IRQ_ports
[NR_IRQS
];
73 static unsigned int uart_irqs
[NR_PORTS
] = UART_IRQ_DEFNS
;
75 /* multiple ports are contiguous in memory */
76 m68328_uart
*uart_addr
= (m68328_uart
*)USTCNT_ADDR
;
78 struct tty_struct m68k_ttys
;
79 struct m68k_serial
*m68k_consinfo
= 0;
81 #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
84 extern wait_queue_head_t keypress_wait
;
87 struct tty_driver
*serial_driver
;
89 /* serial subtype definitions */
90 #define SERIAL_TYPE_NORMAL 1
92 /* number of characters left in xmit buffer before we ask for more */
93 #define WAKEUP_CHARS 256
95 /* Debugging... DEBUG_INTR is bad to use when one of the zs
96 * lines is your console ;(
98 #undef SERIAL_DEBUG_INTR
99 #undef SERIAL_DEBUG_OPEN
100 #undef SERIAL_DEBUG_FLOW
102 #define RS_ISR_PASS_LIMIT 256
104 #define _INLINE_ inline
106 static void change_speed(struct m68k_serial
*info
);
109 * Setup for console. Argument comes from the boot command line.
112 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
113 #define CONSOLE_BAUD_RATE 115200
114 #define DEFAULT_CBAUD B115200
117 /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
118 #ifdef CONFIG_M68VZ328
119 #define CONSOLE_BAUD_RATE 19200
120 #define DEFAULT_CBAUD B19200
125 #ifndef CONSOLE_BAUD_RATE
126 #define CONSOLE_BAUD_RATE 9600
127 #define DEFAULT_CBAUD B9600
131 static int m68328_console_initted
= 0;
132 static int m68328_console_baud
= CONSOLE_BAUD_RATE
;
133 static int m68328_console_cbaud
= DEFAULT_CBAUD
;
137 * tmp_buf is used as a temporary buffer by serial_write. We need to
138 * lock it in case the memcpy_fromfs blocks while swapping in a page,
139 * and some other program tries to do a serial write at the same time.
140 * Since the lock will only come under contention when the system is
141 * swapping and available memory is low, it makes sense to share one
142 * buffer across all the serial ports, since it significantly saves
143 * memory if large numbers of serial ports are open.
145 static unsigned char tmp_buf
[SERIAL_XMIT_SIZE
]; /* This is cheating */
146 DECLARE_MUTEX(tmp_buf_sem
);
148 static inline int serial_paranoia_check(struct m68k_serial
*info
,
149 char *name
, const char *routine
)
151 #ifdef SERIAL_PARANOIA_CHECK
152 static const char *badmagic
=
153 "Warning: bad magic number for serial struct %s in %s\n";
154 static const char *badinfo
=
155 "Warning: null m68k_serial for %s in %s\n";
158 printk(badinfo
, name
, routine
);
161 if (info
->magic
!= SERIAL_MAGIC
) {
162 printk(badmagic
, name
, routine
);
170 * This is used to figure out the divisor speeds and the timeouts
172 static int baud_table
[] = {
173 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
174 9600, 19200, 38400, 57600, 115200, 0 };
176 #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0]))
178 /* Sets or clears DTR/RTS on the requested line */
179 static inline void m68k_rtsdtr(struct m68k_serial
*ss
, int set
)
182 /* set the RTS/CTS line */
189 /* Utility routines */
190 static inline int get_baud(struct m68k_serial
*ss
)
192 unsigned long result
= 115200;
193 unsigned short int baud
= uart_addr
[ss
->line
].ubaud
;
194 if (GET_FIELD(baud
, UBAUD_PRESCALER
) == 0x38) result
= 38400;
195 result
>>= GET_FIELD(baud
, UBAUD_DIVIDE
);
201 * ------------------------------------------------------------
202 * rs_stop() and rs_start()
204 * This routines are called before setting or resetting tty->stopped.
205 * They enable or disable transmitter interrupts, as necessary.
206 * ------------------------------------------------------------
208 static void rs_stop(struct tty_struct
*tty
)
210 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
211 m68328_uart
*uart
= &uart_addr
[info
->line
];
214 if (serial_paranoia_check(info
, tty
->name
, "rs_stop"))
217 save_flags(flags
); cli();
218 uart
->ustcnt
&= ~USTCNT_TXEN
;
219 restore_flags(flags
);
222 static void rs_put_char(char ch
)
224 int flags
, loops
= 0;
226 save_flags(flags
); cli();
228 while (!(UTX
& UTX_TX_AVAIL
) && (loops
< 1000)) {
235 restore_flags(flags
);
238 static void rs_start(struct tty_struct
*tty
)
240 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
241 m68328_uart
*uart
= &uart_addr
[info
->line
];
244 if (serial_paranoia_check(info
, tty
->name
, "rs_start"))
247 save_flags(flags
); cli();
248 if (info
->xmit_cnt
&& info
->xmit_buf
&& !(uart
->ustcnt
& USTCNT_TXEN
)) {
250 uart
->ustcnt
|= USTCNT_TXEN
| USTCNT_TX_INTR_MASK
;
252 uart
->ustcnt
|= USTCNT_TXEN
;
255 restore_flags(flags
);
258 /* Drop into either the boot monitor or kadb upon receiving a break
259 * from keyboard/console input.
261 static void batten_down_hatches(void)
263 /* Drop into the debugger */
266 static _INLINE_
void status_handle(struct m68k_serial
*info
, unsigned short status
)
270 if((info
->tty
->termios
->c_cflag
& CRTSCTS
) &&
271 ((info
->curregs
[3] & AUTO_ENAB
)==0)) {
272 info
->curregs
[3] |= AUTO_ENAB
;
273 info
->pendregs
[3] |= AUTO_ENAB
;
274 write_zsreg(info
->m68k_channel
, 3, info
->curregs
[3]);
277 if((info
->curregs
[3] & AUTO_ENAB
)) {
278 info
->curregs
[3] &= ~AUTO_ENAB
;
279 info
->pendregs
[3] &= ~AUTO_ENAB
;
280 write_zsreg(info
->m68k_channel
, 3, info
->curregs
[3]);
284 /* If this is console input and this is a
285 * 'break asserted' status change interrupt
286 * see if we can drop into the debugger
288 if((status
& URX_BREAK
) && info
->break_abort
)
289 batten_down_hatches();
293 static _INLINE_
void receive_chars(struct m68k_serial
*info
, struct pt_regs
*regs
, unsigned short rx
)
295 struct tty_struct
*tty
= info
->tty
;
296 m68328_uart
*uart
= &uart_addr
[info
->line
];
297 unsigned char ch
, flag
;
300 * This do { } while() loop will get ALL chars out of Rx FIFO
302 #ifndef CONFIG_XCOPILOT_BUGS
305 ch
= GET_FIELD(rx
, URX_RXDATA
);
308 if(URX_BREAK
& rx
) { /* whee, break received */
309 status_handle(info
, rx
);
311 #ifdef CONFIG_MAGIC_SYSRQ
312 } else if (ch
== 0x10) { /* ^P */
316 /* show_net_buffers(); */
318 } else if (ch
== 0x12) { /* ^R */
321 #endif /* CONFIG_MAGIC_SYSRQ */
323 /* It is a 'keyboard interrupt' ;-) */
324 #ifdef CONFIG_CONSOLE
325 wake_up(&keypress_wait
);
333 * Make sure that we do not overflow the buffer
335 if (tty_request_buffer_room(tty
, 1) == 0) {
336 schedule_work(&tty
->flip
.work
);
342 if(rx
& URX_PARITY_ERROR
) {
344 status_handle(info
, rx
);
345 } else if(rx
& URX_OVRUN
) {
347 status_handle(info
, rx
);
348 } else if(rx
& URX_FRAME_ERROR
) {
350 status_handle(info
, rx
);
352 tty_insert_flip_char(tty
, ch
, flag
);
353 #ifndef CONFIG_XCOPILOT_BUGS
354 } while((rx
= uart
->urx
.w
) & URX_DATA_READY
);
357 schedule_work(&tty
->flip
.work
);
363 static _INLINE_
void transmit_chars(struct m68k_serial
*info
)
365 m68328_uart
*uart
= &uart_addr
[info
->line
];
369 uart
->utx
.b
.txdata
= info
->x_char
;
371 goto clear_and_return
;
374 if((info
->xmit_cnt
<= 0) || info
->tty
->stopped
) {
375 /* That's peculiar... TX ints off */
376 uart
->ustcnt
&= ~USTCNT_TX_INTR_MASK
;
377 goto clear_and_return
;
381 uart
->utx
.b
.txdata
= info
->xmit_buf
[info
->xmit_tail
++];
382 info
->xmit_tail
= info
->xmit_tail
& (SERIAL_XMIT_SIZE
-1);
385 if (info
->xmit_cnt
< WAKEUP_CHARS
)
386 schedule_work(&info
->tqueue
);
388 if(info
->xmit_cnt
<= 0) {
389 /* All done for now... TX ints off */
390 uart
->ustcnt
&= ~USTCNT_TX_INTR_MASK
;
391 goto clear_and_return
;
395 /* Clear interrupt (should be auto)*/
400 * This is the serial driver's generic interrupt routine
402 irqreturn_t
rs_interrupt(int irq
, void *dev_id
, struct pt_regs
* regs
)
404 struct m68k_serial
* info
;
409 info
= IRQ_ports
[irq
];
413 uart
= &uart_addr
[info
->line
];
419 if (rx
& URX_DATA_READY
) receive_chars(info
, regs
, rx
);
420 if (tx
& UTX_TX_AVAIL
) transmit_chars(info
);
422 receive_chars(info
, regs
, rx
);
427 static void do_softint(void *private)
429 struct m68k_serial
*info
= (struct m68k_serial
*) private;
430 struct tty_struct
*tty
;
436 if (clear_bit(RS_EVENT_WRITE_WAKEUP
, &info
->event
)) {
443 * This routine is called from the scheduler tqueue when the interrupt
444 * routine has signalled that a hangup has occurred. The path of
445 * hangup processing is:
447 * serial interrupt routine -> (scheduler tqueue) ->
448 * do_serial_hangup() -> tty->hangup() -> rs_hangup()
451 static void do_serial_hangup(void *private)
453 struct m68k_serial
*info
= (struct m68k_serial
*) private;
454 struct tty_struct
*tty
;
464 static int startup(struct m68k_serial
* info
)
466 m68328_uart
*uart
= &uart_addr
[info
->line
];
469 if (info
->flags
& S_INITIALIZED
)
472 if (!info
->xmit_buf
) {
473 info
->xmit_buf
= (unsigned char *) __get_free_page(GFP_KERNEL
);
478 save_flags(flags
); cli();
481 * Clear the FIFO buffers and disable them
482 * (they will be reenabled in change_speed())
485 uart
->ustcnt
= USTCNT_UEN
;
486 info
->xmit_fifo_size
= 1;
487 uart
->ustcnt
= USTCNT_UEN
| USTCNT_RXEN
| USTCNT_TXEN
;
491 * Finally, enable sequencing and interrupts
494 uart
->ustcnt
= USTCNT_UEN
| USTCNT_RXEN
|
495 USTCNT_RX_INTR_MASK
| USTCNT_TX_INTR_MASK
;
497 uart
->ustcnt
= USTCNT_UEN
| USTCNT_RXEN
| USTCNT_RX_INTR_MASK
;
501 clear_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
502 info
->xmit_cnt
= info
->xmit_head
= info
->xmit_tail
= 0;
505 * and set the speed of the serial port
510 info
->flags
|= S_INITIALIZED
;
511 restore_flags(flags
);
516 * This routine will shutdown a serial port; interrupts are disabled, and
517 * DTR is dropped if the hangup on close termio flag is on.
519 static void shutdown(struct m68k_serial
* info
)
521 m68328_uart
*uart
= &uart_addr
[info
->line
];
524 uart
->ustcnt
= 0; /* All off! */
525 if (!(info
->flags
& S_INITIALIZED
))
528 save_flags(flags
); cli(); /* Disable interrupts */
530 if (info
->xmit_buf
) {
531 free_page((unsigned long) info
->xmit_buf
);
536 set_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
538 info
->flags
&= ~S_INITIALIZED
;
539 restore_flags(flags
);
543 int divisor
, prescale
;
545 #ifndef CONFIG_M68VZ328
546 hw_baud_table
[18] = {
561 {1,0x26}, /* 19200 */
562 {0,0x26}, /* 38400 */
563 {1,0x38}, /* 57600 */
564 {0,0x38}, /* 115200 */
567 hw_baud_table
[18] = {
582 {2,0x26}, /* 19200 */
583 {1,0x26}, /* 38400 */
584 {0,0x26}, /* 57600 */
585 {1,0x38}, /* 115200 */
588 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
591 * This routine is called to set the UART divisor registers to match
592 * the specified baud rate for a serial port.
594 static void change_speed(struct m68k_serial
*info
)
596 m68328_uart
*uart
= &uart_addr
[info
->line
];
598 unsigned short ustcnt
;
602 if (!info
->tty
|| !info
->tty
->termios
)
604 cflag
= info
->tty
->termios
->c_cflag
;
605 if (!(port
= info
->port
))
608 ustcnt
= uart
->ustcnt
;
609 uart
->ustcnt
= ustcnt
& ~USTCNT_TXEN
;
613 i
= (i
& ~CBAUDEX
) + B38400
;
616 info
->baud
= baud_table
[i
];
617 uart
->ubaud
= PUT_FIELD(UBAUD_DIVIDE
, hw_baud_table
[i
].divisor
) |
618 PUT_FIELD(UBAUD_PRESCALER
, hw_baud_table
[i
].prescale
);
620 ustcnt
&= ~(USTCNT_PARITYEN
| USTCNT_ODD_EVEN
| USTCNT_STOP
| USTCNT_8_7
);
622 if ((cflag
& CSIZE
) == CS8
)
623 ustcnt
|= USTCNT_8_7
;
626 ustcnt
|= USTCNT_STOP
;
629 ustcnt
|= USTCNT_PARITYEN
;
631 ustcnt
|= USTCNT_ODD_EVEN
;
633 #ifdef CONFIG_SERIAL_68328_RTS_CTS
634 if (cflag
& CRTSCTS
) {
635 uart
->utx
.w
&= ~ UTX_NOCTS
;
637 uart
->utx
.w
|= UTX_NOCTS
;
641 ustcnt
|= USTCNT_TXEN
;
643 uart
->ustcnt
= ustcnt
;
648 * Fair output driver allows a process to speak.
650 static void rs_fair_output(void)
652 int left
; /* Output no more than that */
654 struct m68k_serial
*info
= &m68k_soft
[0];
657 if (info
== 0) return;
658 if (info
->xmit_buf
== 0) return;
660 save_flags(flags
); cli();
661 left
= info
->xmit_cnt
;
663 c
= info
->xmit_buf
[info
->xmit_tail
];
664 info
->xmit_tail
= (info
->xmit_tail
+1) & (SERIAL_XMIT_SIZE
-1);
666 restore_flags(flags
);
670 save_flags(flags
); cli();
671 left
= min(info
->xmit_cnt
, left
-1);
674 /* Last character is being transmitted now (hopefully). */
677 restore_flags(flags
);
682 * m68k_console_print is registered for printk.
684 void console_print_68328(const char *p
)
688 while((c
=*(p
++)) != 0) {
694 /* Comment this if you want to have a strict interrupt-driven output */
700 static void rs_set_ldisc(struct tty_struct
*tty
)
702 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
704 if (serial_paranoia_check(info
, tty
->name
, "rs_set_ldisc"))
707 info
->is_cons
= (tty
->termios
->c_line
== N_TTY
);
709 printk("ttyS%d console mode %s\n", info
->line
, info
->is_cons
? "on" : "off");
712 static void rs_flush_chars(struct tty_struct
*tty
)
714 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
715 m68328_uart
*uart
= &uart_addr
[info
->line
];
718 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_chars"))
724 /* Enable transmitter */
725 save_flags(flags
); cli();
727 if (info
->xmit_cnt
<= 0 || tty
->stopped
|| tty
->hw_stopped
||
729 restore_flags(flags
);
734 uart
->ustcnt
|= USTCNT_TXEN
| USTCNT_TX_INTR_MASK
;
736 uart
->ustcnt
|= USTCNT_TXEN
;
740 if (uart
->utx
.w
& UTX_TX_AVAIL
) {
745 uart
->utx
.b
.txdata
= info
->xmit_buf
[info
->xmit_tail
++];
746 info
->xmit_tail
= info
->xmit_tail
& (SERIAL_XMIT_SIZE
-1);
751 while (!(uart
->utx
.w
& UTX_TX_AVAIL
)) udelay(5);
754 restore_flags(flags
);
757 extern void console_printn(const char * b
, int count
);
759 static int rs_write(struct tty_struct
* tty
,
760 const unsigned char *buf
, int count
)
763 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
764 m68328_uart
*uart
= &uart_addr
[info
->line
];
767 if (serial_paranoia_check(info
, tty
->name
, "rs_write"))
770 if (!tty
|| !info
->xmit_buf
)
776 c
= min_t(int, count
, min(SERIAL_XMIT_SIZE
- info
->xmit_cnt
- 1,
777 SERIAL_XMIT_SIZE
- info
->xmit_head
));
781 memcpy(info
->xmit_buf
+ info
->xmit_head
, buf
, c
);
782 info
->xmit_head
= (info
->xmit_head
+ c
) & (SERIAL_XMIT_SIZE
-1);
784 restore_flags(flags
);
790 if (info
->xmit_cnt
&& !tty
->stopped
&& !tty
->hw_stopped
) {
791 /* Enable transmitter */
794 while(info
->xmit_cnt
) {
797 uart
->ustcnt
|= USTCNT_TXEN
;
799 uart
->ustcnt
|= USTCNT_TX_INTR_MASK
;
801 while (!(uart
->utx
.w
& UTX_TX_AVAIL
)) udelay(5);
803 if (uart
->utx
.w
& UTX_TX_AVAIL
) {
804 uart
->utx
.b
.txdata
= info
->xmit_buf
[info
->xmit_tail
++];
805 info
->xmit_tail
= info
->xmit_tail
& (SERIAL_XMIT_SIZE
-1);
812 restore_flags(flags
);
814 restore_flags(flags
);
818 static int rs_write_room(struct tty_struct
*tty
)
820 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
823 if (serial_paranoia_check(info
, tty
->name
, "rs_write_room"))
825 ret
= SERIAL_XMIT_SIZE
- info
->xmit_cnt
- 1;
831 static int rs_chars_in_buffer(struct tty_struct
*tty
)
833 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
835 if (serial_paranoia_check(info
, tty
->name
, "rs_chars_in_buffer"))
837 return info
->xmit_cnt
;
840 static void rs_flush_buffer(struct tty_struct
*tty
)
842 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
844 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_buffer"))
847 info
->xmit_cnt
= info
->xmit_head
= info
->xmit_tail
= 0;
853 * ------------------------------------------------------------
856 * This routine is called by the upper-layer tty layer to signal that
857 * incoming characters should be throttled.
858 * ------------------------------------------------------------
860 static void rs_throttle(struct tty_struct
* tty
)
862 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
864 if (serial_paranoia_check(info
, tty
->name
, "rs_throttle"))
868 info
->x_char
= STOP_CHAR(tty
);
870 /* Turn off RTS line (do this atomic) */
873 static void rs_unthrottle(struct tty_struct
* tty
)
875 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
877 if (serial_paranoia_check(info
, tty
->name
, "rs_unthrottle"))
884 info
->x_char
= START_CHAR(tty
);
887 /* Assert RTS line (do this atomic) */
891 * ------------------------------------------------------------
892 * rs_ioctl() and friends
893 * ------------------------------------------------------------
896 static int get_serial_info(struct m68k_serial
* info
,
897 struct serial_struct
* retinfo
)
899 struct serial_struct tmp
;
903 memset(&tmp
, 0, sizeof(tmp
));
904 tmp
.type
= info
->type
;
905 tmp
.line
= info
->line
;
906 tmp
.port
= info
->port
;
908 tmp
.flags
= info
->flags
;
909 tmp
.baud_base
= info
->baud_base
;
910 tmp
.close_delay
= info
->close_delay
;
911 tmp
.closing_wait
= info
->closing_wait
;
912 tmp
.custom_divisor
= info
->custom_divisor
;
913 copy_to_user(retinfo
,&tmp
,sizeof(*retinfo
));
917 static int set_serial_info(struct m68k_serial
* info
,
918 struct serial_struct
* new_info
)
920 struct serial_struct new_serial
;
921 struct m68k_serial old_info
;
926 copy_from_user(&new_serial
,new_info
,sizeof(new_serial
));
929 if (!capable(CAP_SYS_ADMIN
)) {
930 if ((new_serial
.baud_base
!= info
->baud_base
) ||
931 (new_serial
.type
!= info
->type
) ||
932 (new_serial
.close_delay
!= info
->close_delay
) ||
933 ((new_serial
.flags
& ~S_USR_MASK
) !=
934 (info
->flags
& ~S_USR_MASK
)))
936 info
->flags
= ((info
->flags
& ~S_USR_MASK
) |
937 (new_serial
.flags
& S_USR_MASK
));
938 info
->custom_divisor
= new_serial
.custom_divisor
;
946 * OK, past this point, all the error checking has been done.
947 * At this point, we start making changes.....
950 info
->baud_base
= new_serial
.baud_base
;
951 info
->flags
= ((info
->flags
& ~S_FLAGS
) |
952 (new_serial
.flags
& S_FLAGS
));
953 info
->type
= new_serial
.type
;
954 info
->close_delay
= new_serial
.close_delay
;
955 info
->closing_wait
= new_serial
.closing_wait
;
958 retval
= startup(info
);
963 * get_lsr_info - get line status register info
965 * Purpose: Let user call ioctl() to get info when the UART physically
966 * is emptied. On bus types like RS485, the transmitter must
967 * release the bus after transmitting. This must be done when
968 * the transmit shift register is empty, not be done when the
969 * transmit holding register is empty. This functionality
970 * allows an RS485 driver to be written in user space.
972 static int get_lsr_info(struct m68k_serial
* info
, unsigned int *value
)
974 #ifdef CONFIG_SERIAL_68328_RTS_CTS
975 m68328_uart
*uart
= &uart_addr
[info
->line
];
977 unsigned char status
;
980 #ifdef CONFIG_SERIAL_68328_RTS_CTS
981 status
= (uart
->utx
.w
& UTX_CTS_STAT
) ? 1 : 0;
986 put_user(status
,value
);
991 * This routine sends a break character out the serial port.
993 static void send_break(struct m68k_serial
* info
, unsigned int duration
)
995 m68328_uart
*uart
= &uart_addr
[info
->line
];
1002 uart
->utx
.w
|= UTX_SEND_BREAK
;
1003 msleep_interruptible(duration
);
1004 uart
->utx
.w
&= ~UTX_SEND_BREAK
;
1006 restore_flags(flags
);
1009 static int rs_ioctl(struct tty_struct
*tty
, struct file
* file
,
1010 unsigned int cmd
, unsigned long arg
)
1013 struct m68k_serial
* info
= (struct m68k_serial
*)tty
->driver_data
;
1016 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1019 if ((cmd
!= TIOCGSERIAL
) && (cmd
!= TIOCSSERIAL
) &&
1020 (cmd
!= TIOCSERCONFIG
) && (cmd
!= TIOCSERGWILD
) &&
1021 (cmd
!= TIOCSERSWILD
) && (cmd
!= TIOCSERGSTRUCT
)) {
1022 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1027 case TCSBRK
: /* SVID version: non-zero arg --> no break */
1028 retval
= tty_check_change(tty
);
1031 tty_wait_until_sent(tty
, 0);
1033 send_break(info
, 250); /* 1/4 second */
1035 case TCSBRKP
: /* support for POSIX tcsendbreak() */
1036 retval
= tty_check_change(tty
);
1039 tty_wait_until_sent(tty
, 0);
1040 send_break(info
, arg
? arg
*(100) : 250);
1043 error
= put_user(C_CLOCAL(tty
) ? 1 : 0,
1044 (unsigned long *) arg
);
1049 get_user(arg
, (unsigned long *) arg
);
1050 tty
->termios
->c_cflag
=
1051 ((tty
->termios
->c_cflag
& ~CLOCAL
) |
1052 (arg
? CLOCAL
: 0));
1055 if (access_ok(VERIFY_WRITE
, (void *) arg
,
1056 sizeof(struct serial_struct
)))
1057 return get_serial_info(info
,
1058 (struct serial_struct
*) arg
);
1061 return set_serial_info(info
,
1062 (struct serial_struct
*) arg
);
1063 case TIOCSERGETLSR
: /* Get line status register */
1064 if (access_ok(VERIFY_WRITE
, (void *) arg
,
1065 sizeof(unsigned int));
1066 return get_lsr_info(info
, (unsigned int *) arg
);
1068 case TIOCSERGSTRUCT
:
1069 if (!access_ok(VERIFY_WRITE
, (void *) arg
,
1070 sizeof(struct m68k_serial
)))
1072 copy_to_user((struct m68k_serial
*) arg
,
1073 info
, sizeof(struct m68k_serial
));
1077 return -ENOIOCTLCMD
;
1082 static void rs_set_termios(struct tty_struct
*tty
, struct termios
*old_termios
)
1084 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
1086 if (tty
->termios
->c_cflag
== old_termios
->c_cflag
)
1091 if ((old_termios
->c_cflag
& CRTSCTS
) &&
1092 !(tty
->termios
->c_cflag
& CRTSCTS
)) {
1093 tty
->hw_stopped
= 0;
1100 * ------------------------------------------------------------
1103 * This routine is called when the serial port gets closed. First, we
1104 * wait for the last remaining data to be sent. Then, we unlink its
1105 * S structure from the interrupt chain if necessary, and we free
1106 * that IRQ if nothing is left in the chain.
1107 * ------------------------------------------------------------
1109 static void rs_close(struct tty_struct
*tty
, struct file
* filp
)
1111 struct m68k_serial
* info
= (struct m68k_serial
*)tty
->driver_data
;
1112 m68328_uart
*uart
= &uart_addr
[info
->line
];
1113 unsigned long flags
;
1115 if (!info
|| serial_paranoia_check(info
, tty
->name
, "rs_close"))
1118 save_flags(flags
); cli();
1120 if (tty_hung_up_p(filp
)) {
1121 restore_flags(flags
);
1125 if ((tty
->count
== 1) && (info
->count
!= 1)) {
1127 * Uh, oh. tty->count is 1, which means that the tty
1128 * structure will be freed. Info->count should always
1129 * be one in these conditions. If it's greater than
1130 * one, we've got real problems, since it means the
1131 * serial port won't be shutdown.
1133 printk("rs_close: bad serial port count; tty->count is 1, "
1134 "info->count is %d\n", info
->count
);
1137 if (--info
->count
< 0) {
1138 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1139 info
->line
, info
->count
);
1143 restore_flags(flags
);
1146 info
->flags
|= S_CLOSING
;
1148 * Now we wait for the transmit buffer to clear; and we notify
1149 * the line discipline to only process XON/XOFF characters.
1152 if (info
->closing_wait
!= S_CLOSING_WAIT_NONE
)
1153 tty_wait_until_sent(tty
, info
->closing_wait
);
1155 * At this point we stop accepting input. To do this, we
1156 * disable the receive line status interrupts, and tell the
1157 * interrupt driver to stop checking the data ready bit in the
1158 * line status register.
1161 uart
->ustcnt
&= ~USTCNT_RXEN
;
1162 uart
->ustcnt
&= ~(USTCNT_RXEN
| USTCNT_RX_INTR_MASK
);
1165 if (tty
->driver
->flush_buffer
)
1166 tty
->driver
->flush_buffer(tty
);
1168 tty_ldisc_flush(tty
);
1172 #warning "This is not and has never been valid so fix it"
1174 if (tty
->ldisc
.num
!= ldiscs
[N_TTY
].num
) {
1175 if (tty
->ldisc
.close
)
1176 (tty
->ldisc
.close
)(tty
);
1177 tty
->ldisc
= ldiscs
[N_TTY
];
1178 tty
->termios
->c_line
= N_TTY
;
1179 if (tty
->ldisc
.open
)
1180 (tty
->ldisc
.open
)(tty
);
1183 if (info
->blocked_open
) {
1184 if (info
->close_delay
) {
1185 msleep_interruptible(jiffies_to_msecs(info
->close_delay
));
1187 wake_up_interruptible(&info
->open_wait
);
1189 info
->flags
&= ~(S_NORMAL_ACTIVE
|S_CLOSING
);
1190 wake_up_interruptible(&info
->close_wait
);
1191 restore_flags(flags
);
1195 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1197 void rs_hangup(struct tty_struct
*tty
)
1199 struct m68k_serial
* info
= (struct m68k_serial
*)tty
->driver_data
;
1201 if (serial_paranoia_check(info
, tty
->name
, "rs_hangup"))
1204 rs_flush_buffer(tty
);
1208 info
->flags
&= ~S_NORMAL_ACTIVE
;
1210 wake_up_interruptible(&info
->open_wait
);
1214 * ------------------------------------------------------------
1215 * rs_open() and friends
1216 * ------------------------------------------------------------
1218 static int block_til_ready(struct tty_struct
*tty
, struct file
* filp
,
1219 struct m68k_serial
*info
)
1221 DECLARE_WAITQUEUE(wait
, current
);
1226 * If the device is in the middle of being closed, then block
1227 * until it's done, and then try again.
1229 if (info
->flags
& S_CLOSING
) {
1230 interruptible_sleep_on(&info
->close_wait
);
1231 #ifdef SERIAL_DO_RESTART
1232 if (info
->flags
& S_HUP_NOTIFY
)
1235 return -ERESTARTSYS
;
1242 * If non-blocking mode is set, or the port is not enabled,
1243 * then make the check up front and then exit.
1245 if ((filp
->f_flags
& O_NONBLOCK
) ||
1246 (tty
->flags
& (1 << TTY_IO_ERROR
))) {
1247 info
->flags
|= S_NORMAL_ACTIVE
;
1251 if (tty
->termios
->c_cflag
& CLOCAL
)
1255 * Block waiting for the carrier detect and the line to become
1256 * free (i.e., not in use by the callout). While we are in
1257 * this loop, info->count is dropped by one, so that
1258 * rs_close() knows when to free things. We restore it upon
1259 * exit, either normal or abnormal.
1262 add_wait_queue(&info
->open_wait
, &wait
);
1265 info
->blocked_open
++;
1268 m68k_rtsdtr(info
, 1);
1270 current
->state
= TASK_INTERRUPTIBLE
;
1271 if (tty_hung_up_p(filp
) ||
1272 !(info
->flags
& S_INITIALIZED
)) {
1273 #ifdef SERIAL_DO_RESTART
1274 if (info
->flags
& S_HUP_NOTIFY
)
1277 retval
= -ERESTARTSYS
;
1283 if (!(info
->flags
& S_CLOSING
) && do_clocal
)
1285 if (signal_pending(current
)) {
1286 retval
= -ERESTARTSYS
;
1291 current
->state
= TASK_RUNNING
;
1292 remove_wait_queue(&info
->open_wait
, &wait
);
1293 if (!tty_hung_up_p(filp
))
1295 info
->blocked_open
--;
1299 info
->flags
|= S_NORMAL_ACTIVE
;
1304 * This routine is called whenever a serial port is opened. It
1305 * enables interrupts for a serial port, linking in its S structure into
1306 * the IRQ chain. It also performs the serial-specific
1307 * initialization for the tty structure.
1309 int rs_open(struct tty_struct
*tty
, struct file
* filp
)
1311 struct m68k_serial
*info
;
1316 if (line
>= NR_PORTS
|| line
< 0) /* we have exactly one */
1319 info
= &m68k_soft
[line
];
1321 if (serial_paranoia_check(info
, tty
->name
, "rs_open"))
1325 tty
->driver_data
= info
;
1329 * Start up serial port
1331 retval
= startup(info
);
1335 return block_til_ready(tty
, filp
, info
);
1338 /* Finally, routines used to initialize the serial driver. */
1340 static void show_serial_version(void)
1342 printk("MC68328 serial driver version 1.00\n");
1345 #ifdef CONFIG_PM_LEGACY
1346 /* Serial Power management
1347 * The console (currently fixed at line 0) is a special case for power
1348 * management because the kernel is so chatty. The console will be
1349 * explicitly disabled my our power manager as the last minute, so we won't
1350 * mess with it here.
1352 static struct pm_dev
*serial_pm
[NR_PORTS
];
1354 static int serial_pm_callback(struct pm_dev
*dev
, pm_request_t request
, void *data
)
1356 struct m68k_serial
*info
= (struct m68k_serial
*)dev
->data
;
1361 /* special case for line 0 - pm restores it */
1377 void shutdown_console(void)
1379 struct m68k_serial
*info
= &m68k_soft
[0];
1381 /* HACK: wait a bit for any pending printk's to be dumped */
1390 void startup_console(void)
1392 struct m68k_serial
*info
= &m68k_soft
[0];
1395 #endif /* CONFIG_PM_LEGACY */
1398 static struct tty_operations rs_ops
= {
1402 .flush_chars
= rs_flush_chars
,
1403 .write_room
= rs_write_room
,
1404 .chars_in_buffer
= rs_chars_in_buffer
,
1405 .flush_buffer
= rs_flush_buffer
,
1407 .throttle
= rs_throttle
,
1408 .unthrottle
= rs_unthrottle
,
1409 .set_termios
= rs_set_termios
,
1412 .hangup
= rs_hangup
,
1413 .set_ldisc
= rs_set_ldisc
,
1416 /* rs_init inits the driver */
1421 struct m68k_serial
*info
;
1423 serial_driver
= alloc_tty_driver(NR_PORTS
);
1427 show_serial_version();
1429 /* Initialize the tty_driver structure */
1430 /* SPARC: Not all of this is exactly right for us. */
1432 serial_driver
->name
= "ttyS";
1433 serial_driver
->major
= TTY_MAJOR
;
1434 serial_driver
->minor_start
= 64;
1435 serial_driver
->type
= TTY_DRIVER_TYPE_SERIAL
;
1436 serial_driver
->subtype
= SERIAL_TYPE_NORMAL
;
1437 serial_driver
->init_termios
= tty_std_termios
;
1438 serial_driver
->init_termios
.c_cflag
=
1439 m68328_console_cbaud
| CS8
| CREAD
| HUPCL
| CLOCAL
;
1440 serial_driver
->flags
= TTY_DRIVER_REAL_RAW
;
1441 tty_set_operations(serial_driver
, &rs_ops
);
1443 if (tty_register_driver(serial_driver
)) {
1444 put_tty_driver(serial_driver
);
1445 printk(KERN_ERR
"Couldn't register serial driver\n");
1449 save_flags(flags
); cli();
1451 for(i
=0;i
<NR_PORTS
;i
++) {
1453 info
= &m68k_soft
[i
];
1454 info
->magic
= SERIAL_MAGIC
;
1455 info
->port
= (int) &uart_addr
[i
];
1457 info
->irq
= uart_irqs
[i
];
1458 info
->custom_divisor
= 16;
1459 info
->close_delay
= 50;
1460 info
->closing_wait
= 3000;
1464 info
->blocked_open
= 0;
1465 INIT_WORK(&info
->tqueue
, do_softint
, info
);
1466 INIT_WORK(&info
->tqueue_hangup
, do_serial_hangup
, info
);
1467 init_waitqueue_head(&info
->open_wait
);
1468 init_waitqueue_head(&info
->close_wait
);
1470 info
->is_cons
= 1; /* Means shortcuts work */
1472 printk("%s%d at 0x%08x (irq = %d)", serial_driver
->name
, info
->line
,
1473 info
->port
, info
->irq
);
1474 printk(" is a builtin MC68328 UART\n");
1476 IRQ_ports
[info
->irq
] = info
; /* waste of space */
1478 #ifdef CONFIG_M68VZ328
1480 PJSEL
&= 0xCF; /* PSW enable second port output */
1483 if (request_irq(uart_irqs
[i
],
1486 "M68328_UART", NULL
))
1487 panic("Unable to attach 68328 serial interrupt\n");
1488 #ifdef CONFIG_PM_LEGACY
1489 serial_pm
[i
] = pm_register(PM_SYS_DEV
, PM_SYS_COM
, serial_pm_callback
);
1491 serial_pm
[i
]->data
= info
;
1494 restore_flags(flags
);
1498 module_init(rs68328_init
);
1502 static void m68328_set_baud(void)
1504 unsigned short ustcnt
;
1508 USTCNT
= ustcnt
& ~USTCNT_TXEN
;
1511 for (i
= 0; i
< sizeof(baud_table
) / sizeof(baud_table
[0]); i
++)
1512 if (baud_table
[i
] == m68328_console_baud
)
1514 if (i
>= sizeof(baud_table
) / sizeof(baud_table
[0])) {
1515 m68328_console_baud
= 9600;
1519 UBAUD
= PUT_FIELD(UBAUD_DIVIDE
, hw_baud_table
[i
].divisor
) |
1520 PUT_FIELD(UBAUD_PRESCALER
, hw_baud_table
[i
].prescale
);
1521 ustcnt
&= ~(USTCNT_PARITYEN
| USTCNT_ODD_EVEN
| USTCNT_STOP
| USTCNT_8_7
);
1522 ustcnt
|= USTCNT_8_7
;
1523 ustcnt
|= USTCNT_TXEN
;
1525 m68328_console_initted
= 1;
1530 int m68328_console_setup(struct console
*cp
, char *arg
)
1532 int i
, n
= CONSOLE_BAUD_RATE
;
1538 n
= simple_strtoul(arg
,NULL
,0);
1540 for (i
= 0; i
< BAUD_TABLE_SIZE
; i
++)
1541 if (baud_table
[i
] == n
)
1543 if (i
< BAUD_TABLE_SIZE
) {
1544 m68328_console_baud
= n
;
1545 m68328_console_cbaud
= 0;
1547 m68328_console_cbaud
|= CBAUDEX
;
1550 m68328_console_cbaud
|= i
;
1553 m68328_set_baud(); /* make sure baud rate changes */
1558 static struct tty_driver
*m68328_console_device(struct console
*c
, int *index
)
1561 return serial_driver
;
1565 void m68328_console_write (struct console
*co
, const char *str
,
1568 if (!m68328_console_initted
)
1573 rs_put_char( *str
++ );
1578 static struct console m68328_driver
= {
1580 .write
= m68328_console_write
,
1581 .device
= m68328_console_device
,
1582 .setup
= m68328_console_setup
,
1583 .flags
= CON_PRINTBUFFER
,
1588 static int __init
m68328_console_init(void)
1590 register_console(&m68328_driver
);
1594 console_initcall(m68328_console_init
);