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/major.h>
27 #include <linux/string.h>
28 #include <linux/fcntl.h>
30 #include <linux/kernel.h>
31 #include <linux/console.h>
32 #include <linux/reboot.h>
33 #include <linux/keyboard.h>
34 #include <linux/init.h>
36 #include <linux/bitops.h>
37 #include <linux/delay.h>
41 #include <asm/system.h>
42 #include <asm/delay.h>
43 #include <asm/uaccess.h>
46 /* note: perhaps we can murge these files, so that you can just
47 * define 1 of them, and they can sort that out for themselves
49 #if defined(CONFIG_M68EZ328)
50 #include <asm/MC68EZ328.h>
52 #if defined(CONFIG_M68VZ328)
53 #include <asm/MC68VZ328.h>
55 #include <asm/MC68328.h>
56 #endif /* CONFIG_M68VZ328 */
57 #endif /* CONFIG_M68EZ328 */
59 #include "68328serial.h"
61 /* Turn off usage of real serial interrupt code, to "support" Copilot */
62 #ifdef CONFIG_XCOPILOT_BUGS
68 static struct m68k_serial m68k_soft[NR_PORTS];
70 static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
72 /* multiple ports are contiguous in memory */
73 m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
75 struct tty_struct m68k_ttys;
76 struct m68k_serial *m68k_consinfo = 0;
78 #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
81 extern wait_queue_head_t keypress_wait;
84 struct tty_driver *serial_driver;
86 /* number of characters left in xmit buffer before we ask for more */
87 #define WAKEUP_CHARS 256
89 /* Debugging... DEBUG_INTR is bad to use when one of the zs
90 * lines is your console ;(
92 #undef SERIAL_DEBUG_INTR
93 #undef SERIAL_DEBUG_OPEN
94 #undef SERIAL_DEBUG_FLOW
96 #define RS_ISR_PASS_LIMIT 256
98 static void change_speed(struct m68k_serial *info);
101 * Setup for console. Argument comes from the boot command line.
104 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
105 #define CONSOLE_BAUD_RATE 115200
106 #define DEFAULT_CBAUD B115200
109 /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
110 #ifdef CONFIG_M68VZ328
111 #define CONSOLE_BAUD_RATE 19200
112 #define DEFAULT_CBAUD B19200
117 #ifndef CONSOLE_BAUD_RATE
118 #define CONSOLE_BAUD_RATE 9600
119 #define DEFAULT_CBAUD B9600
123 static int m68328_console_initted = 0;
124 static int m68328_console_baud = CONSOLE_BAUD_RATE;
125 static int m68328_console_cbaud = DEFAULT_CBAUD;
128 static inline int serial_paranoia_check(struct m68k_serial *info,
129 char *name, const char *routine)
131 #ifdef SERIAL_PARANOIA_CHECK
132 static const char *badmagic =
133 "Warning: bad magic number for serial struct %s in %s\n";
134 static const char *badinfo =
135 "Warning: null m68k_serial for %s in %s\n";
138 printk(badinfo, name, routine);
141 if (info->magic != SERIAL_MAGIC) {
142 printk(badmagic, name, routine);
150 * This is used to figure out the divisor speeds and the timeouts
152 static int baud_table[] = {
153 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
154 9600, 19200, 38400, 57600, 115200, 0 };
156 #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0]))
158 /* Sets or clears DTR/RTS on the requested line */
159 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
162 /* set the RTS/CTS line */
169 /* Utility routines */
170 static inline int get_baud(struct m68k_serial *ss)
172 unsigned long result = 115200;
173 unsigned short int baud = uart_addr[ss->line].ubaud;
174 if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
175 result >>= GET_FIELD(baud, UBAUD_DIVIDE);
181 * ------------------------------------------------------------
182 * rs_stop() and rs_start()
184 * This routines are called before setting or resetting tty->stopped.
185 * They enable or disable transmitter interrupts, as necessary.
186 * ------------------------------------------------------------
188 static void rs_stop(struct tty_struct *tty)
190 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
191 m68328_uart *uart = &uart_addr[info->line];
194 if (serial_paranoia_check(info, tty->name, "rs_stop"))
197 local_irq_save(flags);
198 uart->ustcnt &= ~USTCNT_TXEN;
199 local_irq_restore(flags);
202 static int rs_put_char(char ch)
204 int flags, loops = 0;
206 local_irq_save(flags);
208 while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
215 local_irq_restore(flags);
219 static void rs_start(struct tty_struct *tty)
221 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
222 m68328_uart *uart = &uart_addr[info->line];
225 if (serial_paranoia_check(info, tty->name, "rs_start"))
228 local_irq_save(flags);
229 if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
231 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
233 uart->ustcnt |= USTCNT_TXEN;
236 local_irq_restore(flags);
239 /* Drop into either the boot monitor or kadb upon receiving a break
240 * from keyboard/console input.
242 static void batten_down_hatches(void)
244 /* Drop into the debugger */
247 static void status_handle(struct m68k_serial *info, unsigned short status)
251 if((info->port.tty->termios->c_cflag & CRTSCTS) &&
252 ((info->curregs[3] & AUTO_ENAB)==0)) {
253 info->curregs[3] |= AUTO_ENAB;
254 info->pendregs[3] |= AUTO_ENAB;
255 write_zsreg(info->m68k_channel, 3, info->curregs[3]);
258 if((info->curregs[3] & AUTO_ENAB)) {
259 info->curregs[3] &= ~AUTO_ENAB;
260 info->pendregs[3] &= ~AUTO_ENAB;
261 write_zsreg(info->m68k_channel, 3, info->curregs[3]);
265 /* If this is console input and this is a
266 * 'break asserted' status change interrupt
267 * see if we can drop into the debugger
269 if((status & URX_BREAK) && info->break_abort)
270 batten_down_hatches();
274 static void receive_chars(struct m68k_serial *info, unsigned short rx)
276 struct tty_struct *tty = info->port.tty;
277 m68328_uart *uart = &uart_addr[info->line];
278 unsigned char ch, flag;
281 * This do { } while() loop will get ALL chars out of Rx FIFO
283 #ifndef CONFIG_XCOPILOT_BUGS
286 ch = GET_FIELD(rx, URX_RXDATA);
289 if(URX_BREAK & rx) { /* whee, break received */
290 status_handle(info, rx);
292 #ifdef CONFIG_MAGIC_SYSRQ
293 } else if (ch == 0x10) { /* ^P */
297 /* show_net_buffers(); */
299 } else if (ch == 0x12) { /* ^R */
302 #endif /* CONFIG_MAGIC_SYSRQ */
304 /* It is a 'keyboard interrupt' ;-) */
305 #ifdef CONFIG_CONSOLE
306 wake_up(&keypress_wait);
315 if(rx & URX_PARITY_ERROR) {
317 status_handle(info, rx);
318 } else if(rx & URX_OVRUN) {
320 status_handle(info, rx);
321 } else if(rx & URX_FRAME_ERROR) {
323 status_handle(info, rx);
325 tty_insert_flip_char(tty, ch, flag);
326 #ifndef CONFIG_XCOPILOT_BUGS
327 } while((rx = uart->urx.w) & URX_DATA_READY);
330 tty_schedule_flip(tty);
336 static void transmit_chars(struct m68k_serial *info)
338 m68328_uart *uart = &uart_addr[info->line];
342 uart->utx.b.txdata = info->x_char;
344 goto clear_and_return;
347 if((info->xmit_cnt <= 0) || info->port.tty->stopped) {
348 /* That's peculiar... TX ints off */
349 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
350 goto clear_and_return;
354 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
355 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
358 if (info->xmit_cnt < WAKEUP_CHARS)
359 schedule_work(&info->tqueue);
361 if(info->xmit_cnt <= 0) {
362 /* All done for now... TX ints off */
363 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
364 goto clear_and_return;
368 /* Clear interrupt (should be auto)*/
373 * This is the serial driver's generic interrupt routine
375 irqreturn_t rs_interrupt(int irq, void *dev_id)
377 struct m68k_serial *info = dev_id;
382 uart = &uart_addr[info->line];
388 if (rx & URX_DATA_READY) receive_chars(info, rx);
389 if (tx & UTX_TX_AVAIL) transmit_chars(info);
391 receive_chars(info, rx);
396 static void do_softint(struct work_struct *work)
398 struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue);
399 struct tty_struct *tty;
401 tty = info->port.tty;
405 if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
412 * This routine is called from the scheduler tqueue when the interrupt
413 * routine has signalled that a hangup has occurred. The path of
414 * hangup processing is:
416 * serial interrupt routine -> (scheduler tqueue) ->
417 * do_serial_hangup() -> tty->hangup() -> rs_hangup()
420 static void do_serial_hangup(struct work_struct *work)
422 struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup);
423 struct tty_struct *tty;
425 tty = info->port.tty;
433 static int startup(struct m68k_serial * info)
435 m68328_uart *uart = &uart_addr[info->line];
438 if (info->flags & S_INITIALIZED)
441 if (!info->xmit_buf) {
442 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
447 local_irq_save(flags);
450 * Clear the FIFO buffers and disable them
451 * (they will be reenabled in change_speed())
454 uart->ustcnt = USTCNT_UEN;
455 info->xmit_fifo_size = 1;
456 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
460 * Finally, enable sequencing and interrupts
463 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
464 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
466 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
470 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
471 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
474 * and set the speed of the serial port
479 info->flags |= S_INITIALIZED;
480 local_irq_restore(flags);
485 * This routine will shutdown a serial port; interrupts are disabled, and
486 * DTR is dropped if the hangup on close termio flag is on.
488 static void shutdown(struct m68k_serial * info)
490 m68328_uart *uart = &uart_addr[info->line];
493 uart->ustcnt = 0; /* All off! */
494 if (!(info->flags & S_INITIALIZED))
497 local_irq_save(flags);
499 if (info->xmit_buf) {
500 free_page((unsigned long) info->xmit_buf);
505 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
507 info->flags &= ~S_INITIALIZED;
508 local_irq_restore(flags);
512 int divisor, prescale;
514 #ifndef CONFIG_M68VZ328
515 hw_baud_table[18] = {
530 {1,0x26}, /* 19200 */
531 {0,0x26}, /* 38400 */
532 {1,0x38}, /* 57600 */
533 {0,0x38}, /* 115200 */
536 hw_baud_table[18] = {
551 {2,0x26}, /* 19200 */
552 {1,0x26}, /* 38400 */
553 {0,0x26}, /* 57600 */
554 {1,0x38}, /* 115200 */
557 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
560 * This routine is called to set the UART divisor registers to match
561 * the specified baud rate for a serial port.
563 static void change_speed(struct m68k_serial *info)
565 m68328_uart *uart = &uart_addr[info->line];
567 unsigned short ustcnt;
571 if (!info->port.tty || !info->port.tty->termios)
573 cflag = info->port.tty->termios->c_cflag;
574 if (!(port = info->port))
577 ustcnt = uart->ustcnt;
578 uart->ustcnt = ustcnt & ~USTCNT_TXEN;
582 i = (i & ~CBAUDEX) + B38400;
585 info->baud = baud_table[i];
586 uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
587 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
589 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
591 if ((cflag & CSIZE) == CS8)
592 ustcnt |= USTCNT_8_7;
595 ustcnt |= USTCNT_STOP;
598 ustcnt |= USTCNT_PARITYEN;
600 ustcnt |= USTCNT_ODD_EVEN;
602 #ifdef CONFIG_SERIAL_68328_RTS_CTS
603 if (cflag & CRTSCTS) {
604 uart->utx.w &= ~ UTX_NOCTS;
606 uart->utx.w |= UTX_NOCTS;
610 ustcnt |= USTCNT_TXEN;
612 uart->ustcnt = ustcnt;
617 * Fair output driver allows a process to speak.
619 static void rs_fair_output(void)
621 int left; /* Output no more than that */
623 struct m68k_serial *info = &m68k_soft[0];
626 if (info == 0) return;
627 if (info->xmit_buf == 0) return;
629 local_irq_save(flags);
630 left = info->xmit_cnt;
632 c = info->xmit_buf[info->xmit_tail];
633 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
635 local_irq_restore(flags);
639 local_irq_save(flags);
640 left = min(info->xmit_cnt, left-1);
643 /* Last character is being transmitted now (hopefully). */
646 local_irq_restore(flags);
651 * m68k_console_print is registered for printk.
653 void console_print_68328(const char *p)
657 while((c=*(p++)) != 0) {
663 /* Comment this if you want to have a strict interrupt-driven output */
669 static void rs_set_ldisc(struct tty_struct *tty)
671 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
673 if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
676 info->is_cons = (tty->termios->c_line == N_TTY);
678 printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
681 static void rs_flush_chars(struct tty_struct *tty)
683 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
684 m68328_uart *uart = &uart_addr[info->line];
687 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
693 /* Enable transmitter */
694 local_irq_save(flags);
696 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
698 local_irq_restore(flags);
703 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
705 uart->ustcnt |= USTCNT_TXEN;
709 if (uart->utx.w & UTX_TX_AVAIL) {
714 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
715 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
720 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
723 local_irq_restore(flags);
726 extern void console_printn(const char * b, int count);
728 static int rs_write(struct tty_struct * tty,
729 const unsigned char *buf, int count)
732 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
733 m68328_uart *uart = &uart_addr[info->line];
736 if (serial_paranoia_check(info, tty->name, "rs_write"))
739 if (!tty || !info->xmit_buf)
742 local_save_flags(flags);
745 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
746 SERIAL_XMIT_SIZE - info->xmit_head));
747 local_irq_restore(flags);
752 memcpy(info->xmit_buf + info->xmit_head, buf, c);
755 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
757 local_irq_restore(flags);
763 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
764 /* Enable transmitter */
767 while(info->xmit_cnt) {
770 uart->ustcnt |= USTCNT_TXEN;
772 uart->ustcnt |= USTCNT_TX_INTR_MASK;
774 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
776 if (uart->utx.w & UTX_TX_AVAIL) {
777 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
778 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
785 local_irq_restore(flags);
791 static int rs_write_room(struct tty_struct *tty)
793 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
796 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
798 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
804 static int rs_chars_in_buffer(struct tty_struct *tty)
806 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
808 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
810 return info->xmit_cnt;
813 static void rs_flush_buffer(struct tty_struct *tty)
815 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
818 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
820 local_irq_save(flags);
821 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
822 local_irq_restore(flags);
827 * ------------------------------------------------------------
830 * This routine is called by the upper-layer tty layer to signal that
831 * incoming characters should be throttled.
832 * ------------------------------------------------------------
834 static void rs_throttle(struct tty_struct * tty)
836 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
838 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
842 info->x_char = STOP_CHAR(tty);
844 /* Turn off RTS line (do this atomic) */
847 static void rs_unthrottle(struct tty_struct * tty)
849 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
851 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
858 info->x_char = START_CHAR(tty);
861 /* Assert RTS line (do this atomic) */
865 * ------------------------------------------------------------
866 * rs_ioctl() and friends
867 * ------------------------------------------------------------
870 static int get_serial_info(struct m68k_serial * info,
871 struct serial_struct * retinfo)
873 struct serial_struct tmp;
877 memset(&tmp, 0, sizeof(tmp));
878 tmp.type = info->type;
879 tmp.line = info->line;
880 tmp.port = info->port;
882 tmp.flags = info->flags;
883 tmp.baud_base = info->baud_base;
884 tmp.close_delay = info->close_delay;
885 tmp.closing_wait = info->closing_wait;
886 tmp.custom_divisor = info->custom_divisor;
887 copy_to_user(retinfo,&tmp,sizeof(*retinfo));
891 static int set_serial_info(struct m68k_serial * info,
892 struct serial_struct * new_info)
894 struct serial_struct new_serial;
895 struct m68k_serial old_info;
900 copy_from_user(&new_serial,new_info,sizeof(new_serial));
903 if (!capable(CAP_SYS_ADMIN)) {
904 if ((new_serial.baud_base != info->baud_base) ||
905 (new_serial.type != info->type) ||
906 (new_serial.close_delay != info->close_delay) ||
907 ((new_serial.flags & ~S_USR_MASK) !=
908 (info->flags & ~S_USR_MASK)))
910 info->flags = ((info->flags & ~S_USR_MASK) |
911 (new_serial.flags & S_USR_MASK));
912 info->custom_divisor = new_serial.custom_divisor;
920 * OK, past this point, all the error checking has been done.
921 * At this point, we start making changes.....
924 info->baud_base = new_serial.baud_base;
925 info->flags = ((info->flags & ~S_FLAGS) |
926 (new_serial.flags & S_FLAGS));
927 info->type = new_serial.type;
928 info->close_delay = new_serial.close_delay;
929 info->closing_wait = new_serial.closing_wait;
932 retval = startup(info);
937 * get_lsr_info - get line status register info
939 * Purpose: Let user call ioctl() to get info when the UART physically
940 * is emptied. On bus types like RS485, the transmitter must
941 * release the bus after transmitting. This must be done when
942 * the transmit shift register is empty, not be done when the
943 * transmit holding register is empty. This functionality
944 * allows an RS485 driver to be written in user space.
946 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
948 #ifdef CONFIG_SERIAL_68328_RTS_CTS
949 m68328_uart *uart = &uart_addr[info->line];
951 unsigned char status;
954 local_irq_save(flags);
955 #ifdef CONFIG_SERIAL_68328_RTS_CTS
956 status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
960 local_irq_restore(flags);
961 put_user(status,value);
966 * This routine sends a break character out the serial port.
968 static void send_break(struct m68k_serial * info, unsigned int duration)
970 m68328_uart *uart = &uart_addr[info->line];
974 local_irq_save(flags);
976 uart->utx.w |= UTX_SEND_BREAK;
977 msleep_interruptible(duration);
978 uart->utx.w &= ~UTX_SEND_BREAK;
980 local_irq_restore(flags);
983 static int rs_ioctl(struct tty_struct *tty, struct file * file,
984 unsigned int cmd, unsigned long arg)
987 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
990 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
993 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
994 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
995 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
996 if (tty->flags & (1 << TTY_IO_ERROR))
1001 case TCSBRK: /* SVID version: non-zero arg --> no break */
1002 retval = tty_check_change(tty);
1005 tty_wait_until_sent(tty, 0);
1007 send_break(info, 250); /* 1/4 second */
1009 case TCSBRKP: /* support for POSIX tcsendbreak() */
1010 retval = tty_check_change(tty);
1013 tty_wait_until_sent(tty, 0);
1014 send_break(info, arg ? arg*(100) : 250);
1017 if (access_ok(VERIFY_WRITE, (void *) arg,
1018 sizeof(struct serial_struct)))
1019 return get_serial_info(info,
1020 (struct serial_struct *) arg);
1023 return set_serial_info(info,
1024 (struct serial_struct *) arg);
1025 case TIOCSERGETLSR: /* Get line status register */
1026 if (access_ok(VERIFY_WRITE, (void *) arg,
1027 sizeof(unsigned int)))
1028 return get_lsr_info(info, (unsigned int *) arg);
1030 case TIOCSERGSTRUCT:
1031 if (!access_ok(VERIFY_WRITE, (void *) arg,
1032 sizeof(struct m68k_serial)))
1034 copy_to_user((struct m68k_serial *) arg,
1035 info, sizeof(struct m68k_serial));
1039 return -ENOIOCTLCMD;
1044 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1046 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1050 if ((old_termios->c_cflag & CRTSCTS) &&
1051 !(tty->termios->c_cflag & CRTSCTS)) {
1052 tty->hw_stopped = 0;
1059 * ------------------------------------------------------------
1062 * This routine is called when the serial port gets closed. First, we
1063 * wait for the last remaining data to be sent. Then, we unlink its
1064 * S structure from the interrupt chain if necessary, and we free
1065 * that IRQ if nothing is left in the chain.
1066 * ------------------------------------------------------------
1068 static void rs_close(struct tty_struct *tty, struct file * filp)
1070 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1071 m68328_uart *uart = &uart_addr[info->line];
1072 unsigned long flags;
1074 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1077 local_irq_save(flags);
1079 if (tty_hung_up_p(filp)) {
1080 local_irq_restore(flags);
1084 if ((tty->count == 1) && (info->count != 1)) {
1086 * Uh, oh. tty->count is 1, which means that the tty
1087 * structure will be freed. Info->count should always
1088 * be one in these conditions. If it's greater than
1089 * one, we've got real problems, since it means the
1090 * serial port won't be shutdown.
1092 printk("rs_close: bad serial port count; tty->count is 1, "
1093 "info->count is %d\n", info->count);
1096 if (--info->count < 0) {
1097 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1098 info->line, info->count);
1102 local_irq_restore(flags);
1105 info->flags |= S_CLOSING;
1107 * Now we wait for the transmit buffer to clear; and we notify
1108 * the line discipline to only process XON/XOFF characters.
1111 if (info->closing_wait != S_CLOSING_WAIT_NONE)
1112 tty_wait_until_sent(tty, info->closing_wait);
1114 * At this point we stop accepting input. To do this, we
1115 * disable the receive line status interrupts, and tell the
1116 * interrupt driver to stop checking the data ready bit in the
1117 * line status register.
1120 uart->ustcnt &= ~USTCNT_RXEN;
1121 uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1124 rs_flush_buffer(tty);
1126 tty_ldisc_flush(tty);
1129 info->port.tty = NULL;
1130 #warning "This is not and has never been valid so fix it"
1132 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1133 if (tty->ldisc.close)
1134 (tty->ldisc.close)(tty);
1135 tty->ldisc = ldiscs[N_TTY];
1136 tty->termios->c_line = N_TTY;
1137 if (tty->ldisc.open)
1138 (tty->ldisc.open)(tty);
1141 if (info->blocked_open) {
1142 if (info->close_delay) {
1143 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1145 wake_up_interruptible(&info->open_wait);
1147 info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1148 wake_up_interruptible(&info->close_wait);
1149 local_irq_restore(flags);
1153 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1155 void rs_hangup(struct tty_struct *tty)
1157 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1159 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1162 rs_flush_buffer(tty);
1166 info->flags &= ~S_NORMAL_ACTIVE;
1167 info->port.tty = NULL;
1168 wake_up_interruptible(&info->open_wait);
1172 * ------------------------------------------------------------
1173 * rs_open() and friends
1174 * ------------------------------------------------------------
1176 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1177 struct m68k_serial *info)
1179 DECLARE_WAITQUEUE(wait, current);
1184 * If the device is in the middle of being closed, then block
1185 * until it's done, and then try again.
1187 if (info->flags & S_CLOSING) {
1188 interruptible_sleep_on(&info->close_wait);
1189 #ifdef SERIAL_DO_RESTART
1190 if (info->flags & S_HUP_NOTIFY)
1193 return -ERESTARTSYS;
1200 * If non-blocking mode is set, or the port is not enabled,
1201 * then make the check up front and then exit.
1203 if ((filp->f_flags & O_NONBLOCK) ||
1204 (tty->flags & (1 << TTY_IO_ERROR))) {
1205 info->flags |= S_NORMAL_ACTIVE;
1209 if (tty->termios->c_cflag & CLOCAL)
1213 * Block waiting for the carrier detect and the line to become
1214 * free (i.e., not in use by the callout). While we are in
1215 * this loop, info->count is dropped by one, so that
1216 * rs_close() knows when to free things. We restore it upon
1217 * exit, either normal or abnormal.
1220 add_wait_queue(&info->open_wait, &wait);
1223 info->blocked_open++;
1225 local_irq_disable();
1226 m68k_rtsdtr(info, 1);
1228 current->state = TASK_INTERRUPTIBLE;
1229 if (tty_hung_up_p(filp) ||
1230 !(info->flags & S_INITIALIZED)) {
1231 #ifdef SERIAL_DO_RESTART
1232 if (info->flags & S_HUP_NOTIFY)
1235 retval = -ERESTARTSYS;
1241 if (!(info->flags & S_CLOSING) && do_clocal)
1243 if (signal_pending(current)) {
1244 retval = -ERESTARTSYS;
1249 current->state = TASK_RUNNING;
1250 remove_wait_queue(&info->open_wait, &wait);
1251 if (!tty_hung_up_p(filp))
1253 info->blocked_open--;
1257 info->flags |= S_NORMAL_ACTIVE;
1262 * This routine is called whenever a serial port is opened. It
1263 * enables interrupts for a serial port, linking in its S structure into
1264 * the IRQ chain. It also performs the serial-specific
1265 * initialization for the tty structure.
1267 int rs_open(struct tty_struct *tty, struct file * filp)
1269 struct m68k_serial *info;
1274 if (line >= NR_PORTS || line < 0) /* we have exactly one */
1277 info = &m68k_soft[line];
1279 if (serial_paranoia_check(info, tty->name, "rs_open"))
1283 tty->driver_data = info;
1284 info->port.tty = tty;
1287 * Start up serial port
1289 retval = startup(info);
1293 return block_til_ready(tty, filp, info);
1296 /* Finally, routines used to initialize the serial driver. */
1298 static void show_serial_version(void)
1300 printk("MC68328 serial driver version 1.00\n");
1303 static const struct tty_operations rs_ops = {
1307 .flush_chars = rs_flush_chars,
1308 .write_room = rs_write_room,
1309 .chars_in_buffer = rs_chars_in_buffer,
1310 .flush_buffer = rs_flush_buffer,
1312 .throttle = rs_throttle,
1313 .unthrottle = rs_unthrottle,
1314 .set_termios = rs_set_termios,
1317 .hangup = rs_hangup,
1318 .set_ldisc = rs_set_ldisc,
1321 /* rs_init inits the driver */
1326 struct m68k_serial *info;
1328 serial_driver = alloc_tty_driver(NR_PORTS);
1332 show_serial_version();
1334 /* Initialize the tty_driver structure */
1335 /* SPARC: Not all of this is exactly right for us. */
1337 serial_driver->name = "ttyS";
1338 serial_driver->major = TTY_MAJOR;
1339 serial_driver->minor_start = 64;
1340 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1341 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1342 serial_driver->init_termios = tty_std_termios;
1343 serial_driver->init_termios.c_cflag =
1344 m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1345 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1346 tty_set_operations(serial_driver, &rs_ops);
1348 if (tty_register_driver(serial_driver)) {
1349 put_tty_driver(serial_driver);
1350 printk(KERN_ERR "Couldn't register serial driver\n");
1354 local_irq_save(flags);
1356 for(i=0;i<NR_PORTS;i++) {
1358 info = &m68k_soft[i];
1359 info->magic = SERIAL_MAGIC;
1360 info->port = (int) &uart_addr[i];
1361 info->port.tty = NULL;
1362 info->irq = uart_irqs[i];
1363 info->custom_divisor = 16;
1364 info->close_delay = 50;
1365 info->closing_wait = 3000;
1369 info->blocked_open = 0;
1370 INIT_WORK(&info->tqueue, do_softint);
1371 INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
1372 init_waitqueue_head(&info->open_wait);
1373 init_waitqueue_head(&info->close_wait);
1375 info->is_cons = 1; /* Means shortcuts work */
1377 printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1378 info->port, info->irq);
1379 printk(" is a builtin MC68328 UART\n");
1381 #ifdef CONFIG_M68VZ328
1383 PJSEL &= 0xCF; /* PSW enable second port output */
1386 if (request_irq(uart_irqs[i],
1389 "M68328_UART", info))
1390 panic("Unable to attach 68328 serial interrupt\n");
1392 local_irq_restore(flags);
1396 module_init(rs68328_init);
1400 static void m68328_set_baud(void)
1402 unsigned short ustcnt;
1406 USTCNT = ustcnt & ~USTCNT_TXEN;
1409 for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++)
1410 if (baud_table[i] == m68328_console_baud)
1412 if (i >= sizeof(baud_table) / sizeof(baud_table[0])) {
1413 m68328_console_baud = 9600;
1417 UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
1418 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1419 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1420 ustcnt |= USTCNT_8_7;
1421 ustcnt |= USTCNT_TXEN;
1423 m68328_console_initted = 1;
1428 int m68328_console_setup(struct console *cp, char *arg)
1430 int i, n = CONSOLE_BAUD_RATE;
1436 n = simple_strtoul(arg,NULL,0);
1438 for (i = 0; i < BAUD_TABLE_SIZE; i++)
1439 if (baud_table[i] == n)
1441 if (i < BAUD_TABLE_SIZE) {
1442 m68328_console_baud = n;
1443 m68328_console_cbaud = 0;
1445 m68328_console_cbaud |= CBAUDEX;
1448 m68328_console_cbaud |= i;
1451 m68328_set_baud(); /* make sure baud rate changes */
1456 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1459 return serial_driver;
1463 void m68328_console_write (struct console *co, const char *str,
1466 if (!m68328_console_initted)
1471 rs_put_char( *str++ );
1476 static struct console m68328_driver = {
1478 .write = m68328_console_write,
1479 .device = m68328_console_device,
1480 .setup = m68328_console_setup,
1481 .flags = CON_PRINTBUFFER,
1486 static int __init m68328_console_init(void)
1488 register_console(&m68328_driver);
1492 console_initcall(m68328_console_init);