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>
40 #include <asm/system.h>
41 #include <asm/segment.h>
42 #include <asm/bitops.h>
43 #include <asm/delay.h>
44 #include <asm/uaccess.h>
47 /* note: perhaps we can murge these files, so that you can just
48 * define 1 of them, and they can sort that out for themselves
50 #if defined(CONFIG_M68EZ328)
51 #include <asm/MC68EZ328.h>
53 #if defined(CONFIG_M68VZ328)
54 #include <asm/MC68VZ328.h>
56 #include <asm/MC68328.h>
57 #endif /* CONFIG_M68VZ328 */
58 #endif /* CONFIG_M68EZ328 */
60 #include "68328serial.h"
62 /* Turn off usage of real serial interrupt code, to "support" Copilot */
63 #ifdef CONFIG_XCOPILOT_BUGS
69 static struct m68k_serial m68k_soft
[NR_PORTS
];
70 struct m68k_serial
*IRQ_ports
[NR_IRQS
];
72 static unsigned int uart_irqs
[NR_PORTS
] = UART_IRQ_DEFNS
;
74 /* multiple ports are contiguous in memory */
75 m68328_uart
*uart_addr
= (m68328_uart
*)USTCNT_ADDR
;
77 struct tty_struct m68k_ttys
;
78 struct m68k_serial
*m68k_consinfo
= 0;
80 #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
83 extern wait_queue_head_t keypress_wait
;
86 struct tty_driver
*serial_driver
;
88 /* serial subtype definitions */
89 #define SERIAL_TYPE_NORMAL 1
91 /* number of characters left in xmit buffer before we ask for more */
92 #define WAKEUP_CHARS 256
94 /* Debugging... DEBUG_INTR is bad to use when one of the zs
95 * lines is your console ;(
97 #undef SERIAL_DEBUG_INTR
98 #undef SERIAL_DEBUG_OPEN
99 #undef SERIAL_DEBUG_FLOW
101 #define RS_ISR_PASS_LIMIT 256
103 #define _INLINE_ inline
105 static void change_speed(struct m68k_serial
*info
);
108 * Setup for console. Argument comes from the boot command line.
111 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
112 #define CONSOLE_BAUD_RATE 115200
113 #define DEFAULT_CBAUD B115200
116 /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
117 #ifdef CONFIG_M68VZ328
118 #define CONSOLE_BAUD_RATE 19200
119 #define DEFAULT_CBAUD B19200
124 #ifndef CONSOLE_BAUD_RATE
125 #define CONSOLE_BAUD_RATE 9600
126 #define DEFAULT_CBAUD B9600
130 static int m68328_console_initted
= 0;
131 static int m68328_console_baud
= CONSOLE_BAUD_RATE
;
132 static int m68328_console_cbaud
= DEFAULT_CBAUD
;
136 * tmp_buf is used as a temporary buffer by serial_write. We need to
137 * lock it in case the memcpy_fromfs blocks while swapping in a page,
138 * and some other program tries to do a serial write at the same time.
139 * Since the lock will only come under contention when the system is
140 * swapping and available memory is low, it makes sense to share one
141 * buffer across all the serial ports, since it significantly saves
142 * memory if large numbers of serial ports are open.
144 static unsigned char tmp_buf
[SERIAL_XMIT_SIZE
]; /* This is cheating */
145 DECLARE_MUTEX(tmp_buf_sem
);
147 static inline int serial_paranoia_check(struct m68k_serial
*info
,
148 char *name
, const char *routine
)
150 #ifdef SERIAL_PARANOIA_CHECK
151 static const char *badmagic
=
152 "Warning: bad magic number for serial struct %s in %s\n";
153 static const char *badinfo
=
154 "Warning: null m68k_serial for %s in %s\n";
157 printk(badinfo
, name
, routine
);
160 if (info
->magic
!= SERIAL_MAGIC
) {
161 printk(badmagic
, name
, routine
);
169 * This is used to figure out the divisor speeds and the timeouts
171 static int baud_table
[] = {
172 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
173 9600, 19200, 38400, 57600, 115200, 0 };
175 #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0]))
177 /* Sets or clears DTR/RTS on the requested line */
178 static inline void m68k_rtsdtr(struct m68k_serial
*ss
, int set
)
181 /* set the RTS/CTS line */
188 /* Utility routines */
189 static inline int get_baud(struct m68k_serial
*ss
)
191 unsigned long result
= 115200;
192 unsigned short int baud
= uart_addr
[ss
->line
].ubaud
;
193 if (GET_FIELD(baud
, UBAUD_PRESCALER
) == 0x38) result
= 38400;
194 result
>>= GET_FIELD(baud
, UBAUD_DIVIDE
);
200 * ------------------------------------------------------------
201 * rs_stop() and rs_start()
203 * This routines are called before setting or resetting tty->stopped.
204 * They enable or disable transmitter interrupts, as necessary.
205 * ------------------------------------------------------------
207 static void rs_stop(struct tty_struct
*tty
)
209 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
210 m68328_uart
*uart
= &uart_addr
[info
->line
];
213 if (serial_paranoia_check(info
, tty
->name
, "rs_stop"))
216 save_flags(flags
); cli();
217 uart
->ustcnt
&= ~USTCNT_TXEN
;
218 restore_flags(flags
);
221 static void rs_put_char(char ch
)
223 int flags
, loops
= 0;
225 save_flags(flags
); cli();
227 while (!(UTX
& UTX_TX_AVAIL
) && (loops
< 1000)) {
234 restore_flags(flags
);
237 static void rs_start(struct tty_struct
*tty
)
239 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
240 m68328_uart
*uart
= &uart_addr
[info
->line
];
243 if (serial_paranoia_check(info
, tty
->name
, "rs_start"))
246 save_flags(flags
); cli();
247 if (info
->xmit_cnt
&& info
->xmit_buf
&& !(uart
->ustcnt
& USTCNT_TXEN
)) {
249 uart
->ustcnt
|= USTCNT_TXEN
| USTCNT_TX_INTR_MASK
;
251 uart
->ustcnt
|= USTCNT_TXEN
;
254 restore_flags(flags
);
257 /* Drop into either the boot monitor or kadb upon receiving a break
258 * from keyboard/console input.
260 static void batten_down_hatches(void)
262 /* Drop into the debugger */
265 static _INLINE_
void status_handle(struct m68k_serial
*info
, unsigned short status
)
269 if((info
->tty
->termios
->c_cflag
& CRTSCTS
) &&
270 ((info
->curregs
[3] & AUTO_ENAB
)==0)) {
271 info
->curregs
[3] |= AUTO_ENAB
;
272 info
->pendregs
[3] |= AUTO_ENAB
;
273 write_zsreg(info
->m68k_channel
, 3, info
->curregs
[3]);
276 if((info
->curregs
[3] & AUTO_ENAB
)) {
277 info
->curregs
[3] &= ~AUTO_ENAB
;
278 info
->pendregs
[3] &= ~AUTO_ENAB
;
279 write_zsreg(info
->m68k_channel
, 3, info
->curregs
[3]);
283 /* If this is console input and this is a
284 * 'break asserted' status change interrupt
285 * see if we can drop into the debugger
287 if((status
& URX_BREAK
) && info
->break_abort
)
288 batten_down_hatches();
292 static _INLINE_
void receive_chars(struct m68k_serial
*info
, struct pt_regs
*regs
, unsigned short rx
)
294 struct tty_struct
*tty
= info
->tty
;
295 m68328_uart
*uart
= &uart_addr
[info
->line
];
299 * This do { } while() loop will get ALL chars out of Rx FIFO
301 #ifndef CONFIG_XCOPILOT_BUGS
304 ch
= GET_FIELD(rx
, URX_RXDATA
);
307 if(URX_BREAK
& rx
) { /* whee, break received */
308 status_handle(info
, rx
);
310 #ifdef CONFIG_MAGIC_SYSRQ
311 } else if (ch
== 0x10) { /* ^P */
315 /* show_net_buffers(); */
317 } else if (ch
== 0x12) { /* ^R */
318 machine_restart(NULL
);
320 #endif /* CONFIG_MAGIC_SYSRQ */
322 /* It is a 'keyboard interrupt' ;-) */
323 #ifdef CONFIG_CONSOLE
324 wake_up(&keypress_wait
);
332 * Make sure that we do not overflow the buffer
334 if (tty
->flip
.count
>= TTY_FLIPBUF_SIZE
) {
335 schedule_work(&tty
->flip
.work
);
339 if(rx
& URX_PARITY_ERROR
) {
340 *tty
->flip
.flag_buf_ptr
++ = TTY_PARITY
;
341 status_handle(info
, rx
);
342 } else if(rx
& URX_OVRUN
) {
343 *tty
->flip
.flag_buf_ptr
++ = TTY_OVERRUN
;
344 status_handle(info
, rx
);
345 } else if(rx
& URX_FRAME_ERROR
) {
346 *tty
->flip
.flag_buf_ptr
++ = TTY_FRAME
;
347 status_handle(info
, rx
);
349 *tty
->flip
.flag_buf_ptr
++ = 0; /* XXX */
351 *tty
->flip
.char_buf_ptr
++ = ch
;
354 #ifndef CONFIG_XCOPILOT_BUGS
355 } while((rx
= uart
->urx
.w
) & URX_DATA_READY
);
358 schedule_work(&tty
->flip
.work
);
364 static _INLINE_
void transmit_chars(struct m68k_serial
*info
)
366 m68328_uart
*uart
= &uart_addr
[info
->line
];
370 uart
->utx
.b
.txdata
= info
->x_char
;
372 goto clear_and_return
;
375 if((info
->xmit_cnt
<= 0) || info
->tty
->stopped
) {
376 /* That's peculiar... TX ints off */
377 uart
->ustcnt
&= ~USTCNT_TX_INTR_MASK
;
378 goto clear_and_return
;
382 uart
->utx
.b
.txdata
= info
->xmit_buf
[info
->xmit_tail
++];
383 info
->xmit_tail
= info
->xmit_tail
& (SERIAL_XMIT_SIZE
-1);
386 if (info
->xmit_cnt
< WAKEUP_CHARS
)
387 schedule_work(&info
->tqueue
);
389 if(info
->xmit_cnt
<= 0) {
390 /* All done for now... TX ints off */
391 uart
->ustcnt
&= ~USTCNT_TX_INTR_MASK
;
392 goto clear_and_return
;
396 /* Clear interrupt (should be auto)*/
401 * This is the serial driver's generic interrupt routine
403 irqreturn_t
rs_interrupt(int irq
, void *dev_id
, struct pt_regs
* regs
)
405 struct m68k_serial
* info
;
410 info
= IRQ_ports
[irq
];
414 uart
= &uart_addr
[info
->line
];
420 if (rx
& URX_DATA_READY
) receive_chars(info
, regs
, rx
);
421 if (tx
& UTX_TX_AVAIL
) transmit_chars(info
);
423 receive_chars(info
, regs
, rx
);
428 static void do_softint(void *private)
430 struct m68k_serial
*info
= (struct m68k_serial
*) private;
431 struct tty_struct
*tty
;
437 if (clear_bit(RS_EVENT_WRITE_WAKEUP
, &info
->event
)) {
444 * This routine is called from the scheduler tqueue when the interrupt
445 * routine has signalled that a hangup has occurred. The path of
446 * hangup processing is:
448 * serial interrupt routine -> (scheduler tqueue) ->
449 * do_serial_hangup() -> tty->hangup() -> rs_hangup()
452 static void do_serial_hangup(void *private)
454 struct m68k_serial
*info
= (struct m68k_serial
*) private;
455 struct tty_struct
*tty
;
465 static int startup(struct m68k_serial
* info
)
467 m68328_uart
*uart
= &uart_addr
[info
->line
];
470 if (info
->flags
& S_INITIALIZED
)
473 if (!info
->xmit_buf
) {
474 info
->xmit_buf
= (unsigned char *) __get_free_page(GFP_KERNEL
);
479 save_flags(flags
); cli();
482 * Clear the FIFO buffers and disable them
483 * (they will be reenabled in change_speed())
486 uart
->ustcnt
= USTCNT_UEN
;
487 info
->xmit_fifo_size
= 1;
488 uart
->ustcnt
= USTCNT_UEN
| USTCNT_RXEN
| USTCNT_TXEN
;
492 * Finally, enable sequencing and interrupts
495 uart
->ustcnt
= USTCNT_UEN
| USTCNT_RXEN
|
496 USTCNT_RX_INTR_MASK
| USTCNT_TX_INTR_MASK
;
498 uart
->ustcnt
= USTCNT_UEN
| USTCNT_RXEN
| USTCNT_RX_INTR_MASK
;
502 clear_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
503 info
->xmit_cnt
= info
->xmit_head
= info
->xmit_tail
= 0;
506 * and set the speed of the serial port
511 info
->flags
|= S_INITIALIZED
;
512 restore_flags(flags
);
517 * This routine will shutdown a serial port; interrupts are disabled, and
518 * DTR is dropped if the hangup on close termio flag is on.
520 static void shutdown(struct m68k_serial
* info
)
522 m68328_uart
*uart
= &uart_addr
[info
->line
];
525 uart
->ustcnt
= 0; /* All off! */
526 if (!(info
->flags
& S_INITIALIZED
))
529 save_flags(flags
); cli(); /* Disable interrupts */
531 if (info
->xmit_buf
) {
532 free_page((unsigned long) info
->xmit_buf
);
537 set_bit(TTY_IO_ERROR
, &info
->tty
->flags
);
539 info
->flags
&= ~S_INITIALIZED
;
540 restore_flags(flags
);
544 int divisor
, prescale
;
546 #ifndef CONFIG_M68VZ328
547 hw_baud_table
[18] = {
562 {1,0x26}, /* 19200 */
563 {0,0x26}, /* 38400 */
564 {1,0x38}, /* 57600 */
565 {0,0x38}, /* 115200 */
568 hw_baud_table
[18] = {
583 {2,0x26}, /* 19200 */
584 {1,0x26}, /* 38400 */
585 {0,0x26}, /* 57600 */
586 {1,0x38}, /* 115200 */
589 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
592 * This routine is called to set the UART divisor registers to match
593 * the specified baud rate for a serial port.
595 static void change_speed(struct m68k_serial
*info
)
597 m68328_uart
*uart
= &uart_addr
[info
->line
];
599 unsigned short ustcnt
;
603 if (!info
->tty
|| !info
->tty
->termios
)
605 cflag
= info
->tty
->termios
->c_cflag
;
606 if (!(port
= info
->port
))
609 ustcnt
= uart
->ustcnt
;
610 uart
->ustcnt
= ustcnt
& ~USTCNT_TXEN
;
614 i
= (i
& ~CBAUDEX
) + B38400
;
617 info
->baud
= baud_table
[i
];
618 uart
->ubaud
= PUT_FIELD(UBAUD_DIVIDE
, hw_baud_table
[i
].divisor
) |
619 PUT_FIELD(UBAUD_PRESCALER
, hw_baud_table
[i
].prescale
);
621 ustcnt
&= ~(USTCNT_PARITYEN
| USTCNT_ODD_EVEN
| USTCNT_STOP
| USTCNT_8_7
);
623 if ((cflag
& CSIZE
) == CS8
)
624 ustcnt
|= USTCNT_8_7
;
627 ustcnt
|= USTCNT_STOP
;
630 ustcnt
|= USTCNT_PARITYEN
;
632 ustcnt
|= USTCNT_ODD_EVEN
;
634 #ifdef CONFIG_SERIAL_68328_RTS_CTS
635 if (cflag
& CRTSCTS
) {
636 uart
->utx
.w
&= ~ UTX_NOCTS
;
638 uart
->utx
.w
|= UTX_NOCTS
;
642 ustcnt
|= USTCNT_TXEN
;
644 uart
->ustcnt
= ustcnt
;
649 * Fair output driver allows a process to speak.
651 static void rs_fair_output(void)
653 int left
; /* Output no more than that */
655 struct m68k_serial
*info
= &m68k_soft
[0];
658 if (info
== 0) return;
659 if (info
->xmit_buf
== 0) return;
661 save_flags(flags
); cli();
662 left
= info
->xmit_cnt
;
664 c
= info
->xmit_buf
[info
->xmit_tail
];
665 info
->xmit_tail
= (info
->xmit_tail
+1) & (SERIAL_XMIT_SIZE
-1);
667 restore_flags(flags
);
671 save_flags(flags
); cli();
672 left
= min(info
->xmit_cnt
, left
-1);
675 /* Last character is being transmitted now (hopefully). */
678 restore_flags(flags
);
683 * m68k_console_print is registered for printk.
685 void console_print_68328(const char *p
)
689 while((c
=*(p
++)) != 0) {
695 /* Comment this if you want to have a strict interrupt-driven output */
701 static void rs_set_ldisc(struct tty_struct
*tty
)
703 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
705 if (serial_paranoia_check(info
, tty
->name
, "rs_set_ldisc"))
708 info
->is_cons
= (tty
->termios
->c_line
== N_TTY
);
710 printk("ttyS%d console mode %s\n", info
->line
, info
->is_cons
? "on" : "off");
713 static void rs_flush_chars(struct tty_struct
*tty
)
715 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
716 m68328_uart
*uart
= &uart_addr
[info
->line
];
719 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_chars"))
725 /* Enable transmitter */
726 save_flags(flags
); cli();
728 if (info
->xmit_cnt
<= 0 || tty
->stopped
|| tty
->hw_stopped
||
730 restore_flags(flags
);
735 uart
->ustcnt
|= USTCNT_TXEN
| USTCNT_TX_INTR_MASK
;
737 uart
->ustcnt
|= USTCNT_TXEN
;
741 if (uart
->utx
.w
& UTX_TX_AVAIL
) {
746 uart
->utx
.b
.txdata
= info
->xmit_buf
[info
->xmit_tail
++];
747 info
->xmit_tail
= info
->xmit_tail
& (SERIAL_XMIT_SIZE
-1);
752 while (!(uart
->utx
.w
& UTX_TX_AVAIL
)) udelay(5);
755 restore_flags(flags
);
758 extern void console_printn(const char * b
, int count
);
760 static int rs_write(struct tty_struct
* tty
, int from_user
,
761 const unsigned char *buf
, int count
)
764 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
765 m68328_uart
*uart
= &uart_addr
[info
->line
];
768 if (serial_paranoia_check(info
, tty
->name
, "rs_write"))
771 if (!tty
|| !info
->xmit_buf
)
777 c
= min_t(int, count
, min(SERIAL_XMIT_SIZE
- info
->xmit_cnt
- 1,
778 SERIAL_XMIT_SIZE
- info
->xmit_head
));
784 copy_from_user(tmp_buf
, buf
, c
);
785 c
= min_t(int, c
, min(SERIAL_XMIT_SIZE
- info
->xmit_cnt
- 1,
786 SERIAL_XMIT_SIZE
- info
->xmit_head
));
787 memcpy(info
->xmit_buf
+ info
->xmit_head
, tmp_buf
, c
);
790 memcpy(info
->xmit_buf
+ info
->xmit_head
, buf
, c
);
791 info
->xmit_head
= (info
->xmit_head
+ c
) & (SERIAL_XMIT_SIZE
-1);
793 restore_flags(flags
);
799 if (info
->xmit_cnt
&& !tty
->stopped
&& !tty
->hw_stopped
) {
800 /* Enable transmitter */
803 while(info
->xmit_cnt
) {
806 uart
->ustcnt
|= USTCNT_TXEN
;
808 uart
->ustcnt
|= USTCNT_TX_INTR_MASK
;
810 while (!(uart
->utx
.w
& UTX_TX_AVAIL
)) udelay(5);
812 if (uart
->utx
.w
& UTX_TX_AVAIL
) {
813 uart
->utx
.b
.txdata
= info
->xmit_buf
[info
->xmit_tail
++];
814 info
->xmit_tail
= info
->xmit_tail
& (SERIAL_XMIT_SIZE
-1);
821 restore_flags(flags
);
823 restore_flags(flags
);
827 static int rs_write_room(struct tty_struct
*tty
)
829 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
832 if (serial_paranoia_check(info
, tty
->name
, "rs_write_room"))
834 ret
= SERIAL_XMIT_SIZE
- info
->xmit_cnt
- 1;
840 static int rs_chars_in_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_chars_in_buffer"))
846 return info
->xmit_cnt
;
849 static void rs_flush_buffer(struct tty_struct
*tty
)
851 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
853 if (serial_paranoia_check(info
, tty
->name
, "rs_flush_buffer"))
856 info
->xmit_cnt
= info
->xmit_head
= info
->xmit_tail
= 0;
862 * ------------------------------------------------------------
865 * This routine is called by the upper-layer tty layer to signal that
866 * incoming characters should be throttled.
867 * ------------------------------------------------------------
869 static void rs_throttle(struct tty_struct
* tty
)
871 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
873 if (serial_paranoia_check(info
, tty
->name
, "rs_throttle"))
877 info
->x_char
= STOP_CHAR(tty
);
879 /* Turn off RTS line (do this atomic) */
882 static void rs_unthrottle(struct tty_struct
* tty
)
884 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
886 if (serial_paranoia_check(info
, tty
->name
, "rs_unthrottle"))
893 info
->x_char
= START_CHAR(tty
);
896 /* Assert RTS line (do this atomic) */
900 * ------------------------------------------------------------
901 * rs_ioctl() and friends
902 * ------------------------------------------------------------
905 static int get_serial_info(struct m68k_serial
* info
,
906 struct serial_struct
* retinfo
)
908 struct serial_struct tmp
;
912 memset(&tmp
, 0, sizeof(tmp
));
913 tmp
.type
= info
->type
;
914 tmp
.line
= info
->line
;
915 tmp
.port
= info
->port
;
917 tmp
.flags
= info
->flags
;
918 tmp
.baud_base
= info
->baud_base
;
919 tmp
.close_delay
= info
->close_delay
;
920 tmp
.closing_wait
= info
->closing_wait
;
921 tmp
.custom_divisor
= info
->custom_divisor
;
922 copy_to_user(retinfo
,&tmp
,sizeof(*retinfo
));
926 static int set_serial_info(struct m68k_serial
* info
,
927 struct serial_struct
* new_info
)
929 struct serial_struct new_serial
;
930 struct m68k_serial old_info
;
935 copy_from_user(&new_serial
,new_info
,sizeof(new_serial
));
938 if (!capable(CAP_SYS_ADMIN
)) {
939 if ((new_serial
.baud_base
!= info
->baud_base
) ||
940 (new_serial
.type
!= info
->type
) ||
941 (new_serial
.close_delay
!= info
->close_delay
) ||
942 ((new_serial
.flags
& ~S_USR_MASK
) !=
943 (info
->flags
& ~S_USR_MASK
)))
945 info
->flags
= ((info
->flags
& ~S_USR_MASK
) |
946 (new_serial
.flags
& S_USR_MASK
));
947 info
->custom_divisor
= new_serial
.custom_divisor
;
955 * OK, past this point, all the error checking has been done.
956 * At this point, we start making changes.....
959 info
->baud_base
= new_serial
.baud_base
;
960 info
->flags
= ((info
->flags
& ~S_FLAGS
) |
961 (new_serial
.flags
& S_FLAGS
));
962 info
->type
= new_serial
.type
;
963 info
->close_delay
= new_serial
.close_delay
;
964 info
->closing_wait
= new_serial
.closing_wait
;
967 retval
= startup(info
);
972 * get_lsr_info - get line status register info
974 * Purpose: Let user call ioctl() to get info when the UART physically
975 * is emptied. On bus types like RS485, the transmitter must
976 * release the bus after transmitting. This must be done when
977 * the transmit shift register is empty, not be done when the
978 * transmit holding register is empty. This functionality
979 * allows an RS485 driver to be written in user space.
981 static int get_lsr_info(struct m68k_serial
* info
, unsigned int *value
)
983 #ifdef CONFIG_SERIAL_68328_RTS_CTS
984 m68328_uart
*uart
= &uart_addr
[info
->line
];
986 unsigned char status
;
989 #ifdef CONFIG_SERIAL_68328_RTS_CTS
990 status
= (uart
->utx
.w
& UTX_CTS_STAT
) ? 1 : 0;
995 put_user(status
,value
);
1000 * This routine sends a break character out the serial port.
1002 static void send_break( struct m68k_serial
* info
, int duration
)
1004 m68328_uart
*uart
= &uart_addr
[info
->line
];
1005 unsigned long flags
;
1008 current
->state
= TASK_INTERRUPTIBLE
;
1012 uart
->utx
.w
|= UTX_SEND_BREAK
;
1013 schedule_timeout(duration
);
1014 uart
->utx
.w
&= ~UTX_SEND_BREAK
;
1016 restore_flags(flags
);
1019 static int rs_ioctl(struct tty_struct
*tty
, struct file
* file
,
1020 unsigned int cmd
, unsigned long arg
)
1023 struct m68k_serial
* info
= (struct m68k_serial
*)tty
->driver_data
;
1026 if (serial_paranoia_check(info
, tty
->name
, "rs_ioctl"))
1029 if ((cmd
!= TIOCGSERIAL
) && (cmd
!= TIOCSSERIAL
) &&
1030 (cmd
!= TIOCSERCONFIG
) && (cmd
!= TIOCSERGWILD
) &&
1031 (cmd
!= TIOCSERSWILD
) && (cmd
!= TIOCSERGSTRUCT
)) {
1032 if (tty
->flags
& (1 << TTY_IO_ERROR
))
1037 case TCSBRK
: /* SVID version: non-zero arg --> no break */
1038 retval
= tty_check_change(tty
);
1041 tty_wait_until_sent(tty
, 0);
1043 send_break(info
, HZ
/4); /* 1/4 second */
1045 case TCSBRKP
: /* support for POSIX tcsendbreak() */
1046 retval
= tty_check_change(tty
);
1049 tty_wait_until_sent(tty
, 0);
1050 send_break(info
, arg
? arg
*(HZ
/10) : HZ
/4);
1053 error
= put_user(C_CLOCAL(tty
) ? 1 : 0,
1054 (unsigned long *) arg
);
1059 get_user(arg
, (unsigned long *) arg
);
1060 tty
->termios
->c_cflag
=
1061 ((tty
->termios
->c_cflag
& ~CLOCAL
) |
1062 (arg
? CLOCAL
: 0));
1065 error
= verify_area(VERIFY_WRITE
, (void *) arg
,
1066 sizeof(struct serial_struct
));
1069 return get_serial_info(info
,
1070 (struct serial_struct
*) arg
);
1072 return set_serial_info(info
,
1073 (struct serial_struct
*) arg
);
1074 case TIOCSERGETLSR
: /* Get line status register */
1075 error
= verify_area(VERIFY_WRITE
, (void *) arg
,
1076 sizeof(unsigned int));
1080 return get_lsr_info(info
, (unsigned int *) arg
);
1082 case TIOCSERGSTRUCT
:
1083 error
= verify_area(VERIFY_WRITE
, (void *) arg
,
1084 sizeof(struct m68k_serial
));
1087 copy_to_user((struct m68k_serial
*) arg
,
1088 info
, sizeof(struct m68k_serial
));
1092 return -ENOIOCTLCMD
;
1097 static void rs_set_termios(struct tty_struct
*tty
, struct termios
*old_termios
)
1099 struct m68k_serial
*info
= (struct m68k_serial
*)tty
->driver_data
;
1101 if (tty
->termios
->c_cflag
== old_termios
->c_cflag
)
1106 if ((old_termios
->c_cflag
& CRTSCTS
) &&
1107 !(tty
->termios
->c_cflag
& CRTSCTS
)) {
1108 tty
->hw_stopped
= 0;
1115 * ------------------------------------------------------------
1118 * This routine is called when the serial port gets closed. First, we
1119 * wait for the last remaining data to be sent. Then, we unlink its
1120 * S structure from the interrupt chain if necessary, and we free
1121 * that IRQ if nothing is left in the chain.
1122 * ------------------------------------------------------------
1124 static void rs_close(struct tty_struct
*tty
, struct file
* filp
)
1126 struct m68k_serial
* info
= (struct m68k_serial
*)tty
->driver_data
;
1127 m68328_uart
*uart
= &uart_addr
[info
->line
];
1128 unsigned long flags
;
1130 if (!info
|| serial_paranoia_check(info
, tty
->name
, "rs_close"))
1133 save_flags(flags
); cli();
1135 if (tty_hung_up_p(filp
)) {
1136 restore_flags(flags
);
1140 if ((tty
->count
== 1) && (info
->count
!= 1)) {
1142 * Uh, oh. tty->count is 1, which means that the tty
1143 * structure will be freed. Info->count should always
1144 * be one in these conditions. If it's greater than
1145 * one, we've got real problems, since it means the
1146 * serial port won't be shutdown.
1148 printk("rs_close: bad serial port count; tty->count is 1, "
1149 "info->count is %d\n", info
->count
);
1152 if (--info
->count
< 0) {
1153 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1154 info
->line
, info
->count
);
1158 restore_flags(flags
);
1161 info
->flags
|= S_CLOSING
;
1163 * Now we wait for the transmit buffer to clear; and we notify
1164 * the line discipline to only process XON/XOFF characters.
1167 if (info
->closing_wait
!= S_CLOSING_WAIT_NONE
)
1168 tty_wait_until_sent(tty
, info
->closing_wait
);
1170 * At this point we stop accepting input. To do this, we
1171 * disable the receive line status interrupts, and tell the
1172 * interrupt driver to stop checking the data ready bit in the
1173 * line status register.
1176 uart
->ustcnt
&= ~USTCNT_RXEN
;
1177 uart
->ustcnt
&= ~(USTCNT_RXEN
| USTCNT_RX_INTR_MASK
);
1180 if (tty
->driver
->flush_buffer
)
1181 tty
->driver
->flush_buffer(tty
);
1183 tty_ldisc_flush(tty
);
1187 #warning "This is not and has never been valid so fix it"
1189 if (tty
->ldisc
.num
!= ldiscs
[N_TTY
].num
) {
1190 if (tty
->ldisc
.close
)
1191 (tty
->ldisc
.close
)(tty
);
1192 tty
->ldisc
= ldiscs
[N_TTY
];
1193 tty
->termios
->c_line
= N_TTY
;
1194 if (tty
->ldisc
.open
)
1195 (tty
->ldisc
.open
)(tty
);
1198 if (info
->blocked_open
) {
1199 if (info
->close_delay
) {
1200 current
->state
= TASK_INTERRUPTIBLE
;
1201 schedule_timeout(info
->close_delay
);
1203 wake_up_interruptible(&info
->open_wait
);
1205 info
->flags
&= ~(S_NORMAL_ACTIVE
|S_CLOSING
);
1206 wake_up_interruptible(&info
->close_wait
);
1207 restore_flags(flags
);
1211 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1213 void rs_hangup(struct tty_struct
*tty
)
1215 struct m68k_serial
* info
= (struct m68k_serial
*)tty
->driver_data
;
1217 if (serial_paranoia_check(info
, tty
->name
, "rs_hangup"))
1220 rs_flush_buffer(tty
);
1224 info
->flags
&= ~S_NORMAL_ACTIVE
;
1226 wake_up_interruptible(&info
->open_wait
);
1230 * ------------------------------------------------------------
1231 * rs_open() and friends
1232 * ------------------------------------------------------------
1234 static int block_til_ready(struct tty_struct
*tty
, struct file
* filp
,
1235 struct m68k_serial
*info
)
1237 DECLARE_WAITQUEUE(wait
, current
);
1242 * If the device is in the middle of being closed, then block
1243 * until it's done, and then try again.
1245 if (info
->flags
& S_CLOSING
) {
1246 interruptible_sleep_on(&info
->close_wait
);
1247 #ifdef SERIAL_DO_RESTART
1248 if (info
->flags
& S_HUP_NOTIFY
)
1251 return -ERESTARTSYS
;
1258 * If non-blocking mode is set, or the port is not enabled,
1259 * then make the check up front and then exit.
1261 if ((filp
->f_flags
& O_NONBLOCK
) ||
1262 (tty
->flags
& (1 << TTY_IO_ERROR
))) {
1263 info
->flags
|= S_NORMAL_ACTIVE
;
1267 if (tty
->termios
->c_cflag
& CLOCAL
)
1271 * Block waiting for the carrier detect and the line to become
1272 * free (i.e., not in use by the callout). While we are in
1273 * this loop, info->count is dropped by one, so that
1274 * rs_close() knows when to free things. We restore it upon
1275 * exit, either normal or abnormal.
1278 add_wait_queue(&info
->open_wait
, &wait
);
1281 info
->blocked_open
++;
1284 m68k_rtsdtr(info
, 1);
1286 current
->state
= TASK_INTERRUPTIBLE
;
1287 if (tty_hung_up_p(filp
) ||
1288 !(info
->flags
& S_INITIALIZED
)) {
1289 #ifdef SERIAL_DO_RESTART
1290 if (info
->flags
& S_HUP_NOTIFY
)
1293 retval
= -ERESTARTSYS
;
1299 if (!(info
->flags
& S_CLOSING
) && do_clocal
)
1301 if (signal_pending(current
)) {
1302 retval
= -ERESTARTSYS
;
1307 current
->state
= TASK_RUNNING
;
1308 remove_wait_queue(&info
->open_wait
, &wait
);
1309 if (!tty_hung_up_p(filp
))
1311 info
->blocked_open
--;
1315 info
->flags
|= S_NORMAL_ACTIVE
;
1320 * This routine is called whenever a serial port is opened. It
1321 * enables interrupts for a serial port, linking in its S structure into
1322 * the IRQ chain. It also performs the serial-specific
1323 * initialization for the tty structure.
1325 int rs_open(struct tty_struct
*tty
, struct file
* filp
)
1327 struct m68k_serial
*info
;
1332 if (line
>= NR_PORTS
|| line
< 0) /* we have exactly one */
1335 info
= &m68k_soft
[line
];
1337 if (serial_paranoia_check(info
, tty
->name
, "rs_open"))
1341 tty
->driver_data
= info
;
1345 * Start up serial port
1347 retval
= startup(info
);
1351 return block_til_ready(tty
, filp
, info
);
1354 /* Finally, routines used to initialize the serial driver. */
1356 static void show_serial_version(void)
1358 printk("MC68328 serial driver version 1.00\n");
1362 /* Serial Power management
1363 * The console (currently fixed at line 0) is a special case for power
1364 * management because the kernel is so chatty. The console will be
1365 * explicitly disabled my our power manager as the last minute, so we won't
1366 * mess with it here.
1368 static struct pm_dev
*serial_pm
[NR_PORTS
];
1370 static int serial_pm_callback(struct pm_dev
*dev
, pm_request_t request
, void *data
)
1372 struct m68k_serial
*info
= (struct m68k_serial
*)dev
->data
;
1377 /* special case for line 0 - pm restores it */
1393 void shutdown_console(void)
1395 struct m68k_serial
*info
= &m68k_soft
[0];
1397 /* HACK: wait a bit for any pending printk's to be dumped */
1406 void startup_console(void)
1408 struct m68k_serial
*info
= &m68k_soft
[0];
1414 static struct tty_operations rs_ops
= {
1418 .flush_chars
= rs_flush_chars
,
1419 .write_room
= rs_write_room
,
1420 .chars_in_buffer
= rs_chars_in_buffer
,
1421 .flush_buffer
= rs_flush_buffer
,
1423 .throttle
= rs_throttle
,
1424 .unthrottle
= rs_unthrottle
,
1425 .set_termios
= rs_set_termios
,
1428 .hangup
= rs_hangup
,
1429 .set_ldisc
= rs_set_ldisc
,
1432 /* rs_init inits the driver */
1437 struct m68k_serial
*info
;
1439 serial_driver
= alloc_tty_driver(NR_PORTS
);
1443 show_serial_version();
1445 /* Initialize the tty_driver structure */
1446 /* SPARC: Not all of this is exactly right for us. */
1448 serial_driver
->name
= "ttyS";
1449 serial_driver
->major
= TTY_MAJOR
;
1450 serial_driver
->minor_start
= 64;
1451 serial_driver
->type
= TTY_DRIVER_TYPE_SERIAL
;
1452 serial_driver
->subtype
= SERIAL_TYPE_NORMAL
;
1453 serial_driver
->init_termios
= tty_std_termios
;
1454 serial_driver
->init_termios
.c_cflag
=
1455 m68328_console_cbaud
| CS8
| CREAD
| HUPCL
| CLOCAL
;
1456 serial_driver
->flags
= TTY_DRIVER_REAL_RAW
;
1457 tty_set_operations(serial_driver
, &rs_ops
);
1459 if (tty_register_driver(serial_driver
)) {
1460 put_tty_driver(serial_driver
);
1461 printk(KERN_ERR
"Couldn't register serial driver\n");
1465 save_flags(flags
); cli();
1467 for(i
=0;i
<NR_PORTS
;i
++) {
1469 info
= &m68k_soft
[i
];
1470 info
->magic
= SERIAL_MAGIC
;
1471 info
->port
= (int) &uart_addr
[i
];
1473 info
->irq
= uart_irqs
[i
];
1474 info
->custom_divisor
= 16;
1475 info
->close_delay
= 50;
1476 info
->closing_wait
= 3000;
1480 info
->blocked_open
= 0;
1481 INIT_WORK(&info
->tqueue
, do_softint
, info
);
1482 INIT_WORK(&info
->tqueue_hangup
, do_serial_hangup
, info
);
1483 init_waitqueue_head(&info
->open_wait
);
1484 init_waitqueue_head(&info
->close_wait
);
1486 info
->is_cons
= 1; /* Means shortcuts work */
1488 printk("%s%d at 0x%08x (irq = %d)", serial_driver
->name
, info
->line
,
1489 info
->port
, info
->irq
);
1490 printk(" is a builtin MC68328 UART\n");
1492 IRQ_ports
[info
->irq
] = info
; /* waste of space */
1494 #ifdef CONFIG_M68VZ328
1496 PJSEL
&= 0xCF; /* PSW enable second port output */
1499 if (request_irq(uart_irqs
[i
],
1502 "M68328_UART", NULL
))
1503 panic("Unable to attach 68328 serial interrupt\n");
1505 serial_pm
[i
] = pm_register(PM_SYS_DEV
, PM_SYS_COM
, serial_pm_callback
);
1507 serial_pm
[i
]->data
= info
;
1510 restore_flags(flags
);
1517 * register_serial and unregister_serial allows for serial ports to be
1518 * configured at run-time, to support PCMCIA modems.
1520 /* SPARC: Unused at this time, just here to make things link. */
1521 int register_serial(struct serial_struct
*req
)
1526 void unregister_serial(int line
)
1531 module_init(rs68328_init
);
1535 static void m68328_set_baud(void)
1537 unsigned short ustcnt
;
1541 USTCNT
= ustcnt
& ~USTCNT_TXEN
;
1544 for (i
= 0; i
< sizeof(baud_table
) / sizeof(baud_table
[0]); i
++)
1545 if (baud_table
[i
] == m68328_console_baud
)
1547 if (i
>= sizeof(baud_table
) / sizeof(baud_table
[0])) {
1548 m68328_console_baud
= 9600;
1552 UBAUD
= PUT_FIELD(UBAUD_DIVIDE
, hw_baud_table
[i
].divisor
) |
1553 PUT_FIELD(UBAUD_PRESCALER
, hw_baud_table
[i
].prescale
);
1554 ustcnt
&= ~(USTCNT_PARITYEN
| USTCNT_ODD_EVEN
| USTCNT_STOP
| USTCNT_8_7
);
1555 ustcnt
|= USTCNT_8_7
;
1556 ustcnt
|= USTCNT_TXEN
;
1558 m68328_console_initted
= 1;
1563 int m68328_console_setup(struct console
*cp
, char *arg
)
1565 int i
, n
= CONSOLE_BAUD_RATE
;
1571 n
= simple_strtoul(arg
,NULL
,0);
1573 for (i
= 0; i
< BAUD_TABLE_SIZE
; i
++)
1574 if (baud_table
[i
] == n
)
1576 if (i
< BAUD_TABLE_SIZE
) {
1577 m68328_console_baud
= n
;
1578 m68328_console_cbaud
= 0;
1580 m68328_console_cbaud
|= CBAUDEX
;
1583 m68328_console_cbaud
|= i
;
1586 m68328_set_baud(); /* make sure baud rate changes */
1591 static struct tty_driver
*m68328_console_device(struct console
*c
, int *index
)
1594 return serial_driver
;
1598 void m68328_console_write (struct console
*co
, const char *str
,
1601 if (!m68328_console_initted
)
1606 rs_put_char( *str
++ );
1611 static struct console m68328_driver
= {
1613 .write
= m68328_console_write
,
1614 .device
= m68328_console_device
,
1615 .setup
= m68328_console_setup
,
1616 .flags
= CON_PRINTBUFFER
,
1621 static int __init
m68328_console_init(void)
1623 register_console(&m68328_driver
);
1627 console_initcall(m68328_console_init
);