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];
69 struct m68k_serial *IRQ_ports[NR_IRQS];
71 static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
73 /* multiple ports are contiguous in memory */
74 m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
76 struct tty_struct m68k_ttys;
77 struct m68k_serial *m68k_consinfo = 0;
79 #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
82 extern wait_queue_head_t keypress_wait;
85 struct tty_driver *serial_driver;
87 /* number of characters left in xmit buffer before we ask for more */
88 #define WAKEUP_CHARS 256
90 /* Debugging... DEBUG_INTR is bad to use when one of the zs
91 * lines is your console ;(
93 #undef SERIAL_DEBUG_INTR
94 #undef SERIAL_DEBUG_OPEN
95 #undef SERIAL_DEBUG_FLOW
97 #define RS_ISR_PASS_LIMIT 256
99 static void change_speed(struct m68k_serial *info);
102 * Setup for console. Argument comes from the boot command line.
105 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
106 #define CONSOLE_BAUD_RATE 115200
107 #define DEFAULT_CBAUD B115200
110 /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
111 #ifdef CONFIG_M68VZ328
112 #define CONSOLE_BAUD_RATE 19200
113 #define DEFAULT_CBAUD B19200
118 #ifndef CONSOLE_BAUD_RATE
119 #define CONSOLE_BAUD_RATE 9600
120 #define DEFAULT_CBAUD B9600
124 static int m68328_console_initted = 0;
125 static int m68328_console_baud = CONSOLE_BAUD_RATE;
126 static int m68328_console_cbaud = DEFAULT_CBAUD;
129 static inline int serial_paranoia_check(struct m68k_serial *info,
130 char *name, const char *routine)
132 #ifdef SERIAL_PARANOIA_CHECK
133 static const char *badmagic =
134 "Warning: bad magic number for serial struct %s in %s\n";
135 static const char *badinfo =
136 "Warning: null m68k_serial for %s in %s\n";
139 printk(badinfo, name, routine);
142 if (info->magic != SERIAL_MAGIC) {
143 printk(badmagic, name, routine);
151 * This is used to figure out the divisor speeds and the timeouts
153 static int baud_table[] = {
154 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
155 9600, 19200, 38400, 57600, 115200, 0 };
157 #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0]))
159 /* Sets or clears DTR/RTS on the requested line */
160 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
163 /* set the RTS/CTS line */
170 /* Utility routines */
171 static inline int get_baud(struct m68k_serial *ss)
173 unsigned long result = 115200;
174 unsigned short int baud = uart_addr[ss->line].ubaud;
175 if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
176 result >>= GET_FIELD(baud, UBAUD_DIVIDE);
182 * ------------------------------------------------------------
183 * rs_stop() and rs_start()
185 * This routines are called before setting or resetting tty->stopped.
186 * They enable or disable transmitter interrupts, as necessary.
187 * ------------------------------------------------------------
189 static void rs_stop(struct tty_struct *tty)
191 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
192 m68328_uart *uart = &uart_addr[info->line];
195 if (serial_paranoia_check(info, tty->name, "rs_stop"))
198 local_irq_save(flags);
199 uart->ustcnt &= ~USTCNT_TXEN;
200 local_irq_restore(flags);
203 static void rs_put_char(char ch)
205 int flags, loops = 0;
207 local_irq_save(flags);
209 while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
216 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->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->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->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;
382 info = IRQ_ports[irq];
386 uart = &uart_addr[info->line];
392 if (rx & URX_DATA_READY) receive_chars(info, rx);
393 if (tx & UTX_TX_AVAIL) transmit_chars(info);
395 receive_chars(info, rx);
400 static void do_softint(struct work_struct *work)
402 struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue);
403 struct tty_struct *tty;
409 if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
416 * This routine is called from the scheduler tqueue when the interrupt
417 * routine has signalled that a hangup has occurred. The path of
418 * hangup processing is:
420 * serial interrupt routine -> (scheduler tqueue) ->
421 * do_serial_hangup() -> tty->hangup() -> rs_hangup()
424 static void do_serial_hangup(struct work_struct *work)
426 struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup);
427 struct tty_struct *tty;
437 static int startup(struct m68k_serial * info)
439 m68328_uart *uart = &uart_addr[info->line];
442 if (info->flags & S_INITIALIZED)
445 if (!info->xmit_buf) {
446 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
451 local_irq_save(flags);
454 * Clear the FIFO buffers and disable them
455 * (they will be reenabled in change_speed())
458 uart->ustcnt = USTCNT_UEN;
459 info->xmit_fifo_size = 1;
460 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
464 * Finally, enable sequencing and interrupts
467 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
468 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
470 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
474 clear_bit(TTY_IO_ERROR, &info->tty->flags);
475 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
478 * and set the speed of the serial port
483 info->flags |= S_INITIALIZED;
484 local_irq_restore(flags);
489 * This routine will shutdown a serial port; interrupts are disabled, and
490 * DTR is dropped if the hangup on close termio flag is on.
492 static void shutdown(struct m68k_serial * info)
494 m68328_uart *uart = &uart_addr[info->line];
497 uart->ustcnt = 0; /* All off! */
498 if (!(info->flags & S_INITIALIZED))
501 local_irq_save(flags);
503 if (info->xmit_buf) {
504 free_page((unsigned long) info->xmit_buf);
509 set_bit(TTY_IO_ERROR, &info->tty->flags);
511 info->flags &= ~S_INITIALIZED;
512 local_irq_restore(flags);
516 int divisor, prescale;
518 #ifndef CONFIG_M68VZ328
519 hw_baud_table[18] = {
534 {1,0x26}, /* 19200 */
535 {0,0x26}, /* 38400 */
536 {1,0x38}, /* 57600 */
537 {0,0x38}, /* 115200 */
540 hw_baud_table[18] = {
555 {2,0x26}, /* 19200 */
556 {1,0x26}, /* 38400 */
557 {0,0x26}, /* 57600 */
558 {1,0x38}, /* 115200 */
561 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
564 * This routine is called to set the UART divisor registers to match
565 * the specified baud rate for a serial port.
567 static void change_speed(struct m68k_serial *info)
569 m68328_uart *uart = &uart_addr[info->line];
571 unsigned short ustcnt;
575 if (!info->tty || !info->tty->termios)
577 cflag = info->tty->termios->c_cflag;
578 if (!(port = info->port))
581 ustcnt = uart->ustcnt;
582 uart->ustcnt = ustcnt & ~USTCNT_TXEN;
586 i = (i & ~CBAUDEX) + B38400;
589 info->baud = baud_table[i];
590 uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
591 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
593 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
595 if ((cflag & CSIZE) == CS8)
596 ustcnt |= USTCNT_8_7;
599 ustcnt |= USTCNT_STOP;
602 ustcnt |= USTCNT_PARITYEN;
604 ustcnt |= USTCNT_ODD_EVEN;
606 #ifdef CONFIG_SERIAL_68328_RTS_CTS
607 if (cflag & CRTSCTS) {
608 uart->utx.w &= ~ UTX_NOCTS;
610 uart->utx.w |= UTX_NOCTS;
614 ustcnt |= USTCNT_TXEN;
616 uart->ustcnt = ustcnt;
621 * Fair output driver allows a process to speak.
623 static void rs_fair_output(void)
625 int left; /* Output no more than that */
627 struct m68k_serial *info = &m68k_soft[0];
630 if (info == 0) return;
631 if (info->xmit_buf == 0) return;
633 local_irq_save(flags);
634 left = info->xmit_cnt;
636 c = info->xmit_buf[info->xmit_tail];
637 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
639 local_irq_restore(flags);
643 local_irq_save(flags);
644 left = min(info->xmit_cnt, left-1);
647 /* Last character is being transmitted now (hopefully). */
650 local_irq_restore(flags);
655 * m68k_console_print is registered for printk.
657 void console_print_68328(const char *p)
661 while((c=*(p++)) != 0) {
667 /* Comment this if you want to have a strict interrupt-driven output */
673 static void rs_set_ldisc(struct tty_struct *tty)
675 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
677 if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
680 info->is_cons = (tty->termios->c_line == N_TTY);
682 printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
685 static void rs_flush_chars(struct tty_struct *tty)
687 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
688 m68328_uart *uart = &uart_addr[info->line];
691 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
697 /* Enable transmitter */
698 local_irq_save(flags);
700 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
702 local_irq_restore(flags);
707 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
709 uart->ustcnt |= USTCNT_TXEN;
713 if (uart->utx.w & UTX_TX_AVAIL) {
718 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
719 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
724 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
727 local_irq_restore(flags);
730 extern void console_printn(const char * b, int count);
732 static int rs_write(struct tty_struct * tty,
733 const unsigned char *buf, int count)
736 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
737 m68328_uart *uart = &uart_addr[info->line];
740 if (serial_paranoia_check(info, tty->name, "rs_write"))
743 if (!tty || !info->xmit_buf)
746 local_save_flags(flags);
749 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
750 SERIAL_XMIT_SIZE - info->xmit_head));
751 local_irq_restore(flags);
756 memcpy(info->xmit_buf + info->xmit_head, buf, c);
759 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
761 local_irq_restore(flags);
767 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
768 /* Enable transmitter */
771 while(info->xmit_cnt) {
774 uart->ustcnt |= USTCNT_TXEN;
776 uart->ustcnt |= USTCNT_TX_INTR_MASK;
778 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
780 if (uart->utx.w & UTX_TX_AVAIL) {
781 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
782 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
789 local_irq_restore(flags);
795 static int rs_write_room(struct tty_struct *tty)
797 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
800 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
802 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
808 static int rs_chars_in_buffer(struct tty_struct *tty)
810 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
812 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
814 return info->xmit_cnt;
817 static void rs_flush_buffer(struct tty_struct *tty)
819 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
822 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
824 local_irq_save(flags);
825 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
826 local_irq_restore(flags);
831 * ------------------------------------------------------------
834 * This routine is called by the upper-layer tty layer to signal that
835 * incoming characters should be throttled.
836 * ------------------------------------------------------------
838 static void rs_throttle(struct tty_struct * tty)
840 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
842 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
846 info->x_char = STOP_CHAR(tty);
848 /* Turn off RTS line (do this atomic) */
851 static void rs_unthrottle(struct tty_struct * tty)
853 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
855 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
862 info->x_char = START_CHAR(tty);
865 /* Assert RTS line (do this atomic) */
869 * ------------------------------------------------------------
870 * rs_ioctl() and friends
871 * ------------------------------------------------------------
874 static int get_serial_info(struct m68k_serial * info,
875 struct serial_struct * retinfo)
877 struct serial_struct tmp;
881 memset(&tmp, 0, sizeof(tmp));
882 tmp.type = info->type;
883 tmp.line = info->line;
884 tmp.port = info->port;
886 tmp.flags = info->flags;
887 tmp.baud_base = info->baud_base;
888 tmp.close_delay = info->close_delay;
889 tmp.closing_wait = info->closing_wait;
890 tmp.custom_divisor = info->custom_divisor;
891 copy_to_user(retinfo,&tmp,sizeof(*retinfo));
895 static int set_serial_info(struct m68k_serial * info,
896 struct serial_struct * new_info)
898 struct serial_struct new_serial;
899 struct m68k_serial old_info;
904 copy_from_user(&new_serial,new_info,sizeof(new_serial));
907 if (!capable(CAP_SYS_ADMIN)) {
908 if ((new_serial.baud_base != info->baud_base) ||
909 (new_serial.type != info->type) ||
910 (new_serial.close_delay != info->close_delay) ||
911 ((new_serial.flags & ~S_USR_MASK) !=
912 (info->flags & ~S_USR_MASK)))
914 info->flags = ((info->flags & ~S_USR_MASK) |
915 (new_serial.flags & S_USR_MASK));
916 info->custom_divisor = new_serial.custom_divisor;
924 * OK, past this point, all the error checking has been done.
925 * At this point, we start making changes.....
928 info->baud_base = new_serial.baud_base;
929 info->flags = ((info->flags & ~S_FLAGS) |
930 (new_serial.flags & S_FLAGS));
931 info->type = new_serial.type;
932 info->close_delay = new_serial.close_delay;
933 info->closing_wait = new_serial.closing_wait;
936 retval = startup(info);
941 * get_lsr_info - get line status register info
943 * Purpose: Let user call ioctl() to get info when the UART physically
944 * is emptied. On bus types like RS485, the transmitter must
945 * release the bus after transmitting. This must be done when
946 * the transmit shift register is empty, not be done when the
947 * transmit holding register is empty. This functionality
948 * allows an RS485 driver to be written in user space.
950 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
952 #ifdef CONFIG_SERIAL_68328_RTS_CTS
953 m68328_uart *uart = &uart_addr[info->line];
955 unsigned char status;
958 local_irq_save(flags);
959 #ifdef CONFIG_SERIAL_68328_RTS_CTS
960 status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
964 local_irq_restore(flags);
965 put_user(status,value);
970 * This routine sends a break character out the serial port.
972 static void send_break(struct m68k_serial * info, unsigned int duration)
974 m68328_uart *uart = &uart_addr[info->line];
978 local_irq_save(flags);
980 uart->utx.w |= UTX_SEND_BREAK;
981 msleep_interruptible(duration);
982 uart->utx.w &= ~UTX_SEND_BREAK;
984 local_irq_restore(flags);
987 static int rs_ioctl(struct tty_struct *tty, struct file * file,
988 unsigned int cmd, unsigned long arg)
991 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
994 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
997 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
998 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
999 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
1000 if (tty->flags & (1 << TTY_IO_ERROR))
1005 case TCSBRK: /* SVID version: non-zero arg --> no break */
1006 retval = tty_check_change(tty);
1009 tty_wait_until_sent(tty, 0);
1011 send_break(info, 250); /* 1/4 second */
1013 case TCSBRKP: /* support for POSIX tcsendbreak() */
1014 retval = tty_check_change(tty);
1017 tty_wait_until_sent(tty, 0);
1018 send_break(info, arg ? arg*(100) : 250);
1021 error = put_user(C_CLOCAL(tty) ? 1 : 0,
1022 (unsigned long *) arg);
1027 get_user(arg, (unsigned long *) arg);
1028 tty->termios->c_cflag =
1029 ((tty->termios->c_cflag & ~CLOCAL) |
1030 (arg ? CLOCAL : 0));
1033 if (access_ok(VERIFY_WRITE, (void *) arg,
1034 sizeof(struct serial_struct)))
1035 return get_serial_info(info,
1036 (struct serial_struct *) arg);
1039 return set_serial_info(info,
1040 (struct serial_struct *) arg);
1041 case TIOCSERGETLSR: /* Get line status register */
1042 if (access_ok(VERIFY_WRITE, (void *) arg,
1043 sizeof(unsigned int)))
1044 return get_lsr_info(info, (unsigned int *) arg);
1046 case TIOCSERGSTRUCT:
1047 if (!access_ok(VERIFY_WRITE, (void *) arg,
1048 sizeof(struct m68k_serial)))
1050 copy_to_user((struct m68k_serial *) arg,
1051 info, sizeof(struct m68k_serial));
1055 return -ENOIOCTLCMD;
1060 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1062 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1064 if (tty->termios->c_cflag == old_termios->c_cflag)
1069 if ((old_termios->c_cflag & CRTSCTS) &&
1070 !(tty->termios->c_cflag & CRTSCTS)) {
1071 tty->hw_stopped = 0;
1078 * ------------------------------------------------------------
1081 * This routine is called when the serial port gets closed. First, we
1082 * wait for the last remaining data to be sent. Then, we unlink its
1083 * S structure from the interrupt chain if necessary, and we free
1084 * that IRQ if nothing is left in the chain.
1085 * ------------------------------------------------------------
1087 static void rs_close(struct tty_struct *tty, struct file * filp)
1089 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1090 m68328_uart *uart = &uart_addr[info->line];
1091 unsigned long flags;
1093 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1096 local_irq_save(flags);
1098 if (tty_hung_up_p(filp)) {
1099 local_irq_restore(flags);
1103 if ((tty->count == 1) && (info->count != 1)) {
1105 * Uh, oh. tty->count is 1, which means that the tty
1106 * structure will be freed. Info->count should always
1107 * be one in these conditions. If it's greater than
1108 * one, we've got real problems, since it means the
1109 * serial port won't be shutdown.
1111 printk("rs_close: bad serial port count; tty->count is 1, "
1112 "info->count is %d\n", info->count);
1115 if (--info->count < 0) {
1116 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1117 info->line, info->count);
1121 local_irq_restore(flags);
1124 info->flags |= S_CLOSING;
1126 * Now we wait for the transmit buffer to clear; and we notify
1127 * the line discipline to only process XON/XOFF characters.
1130 if (info->closing_wait != S_CLOSING_WAIT_NONE)
1131 tty_wait_until_sent(tty, info->closing_wait);
1133 * At this point we stop accepting input. To do this, we
1134 * disable the receive line status interrupts, and tell the
1135 * interrupt driver to stop checking the data ready bit in the
1136 * line status register.
1139 uart->ustcnt &= ~USTCNT_RXEN;
1140 uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1143 if (tty->driver->flush_buffer)
1144 tty->driver->flush_buffer(tty);
1146 tty_ldisc_flush(tty);
1150 #warning "This is not and has never been valid so fix it"
1152 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1153 if (tty->ldisc.close)
1154 (tty->ldisc.close)(tty);
1155 tty->ldisc = ldiscs[N_TTY];
1156 tty->termios->c_line = N_TTY;
1157 if (tty->ldisc.open)
1158 (tty->ldisc.open)(tty);
1161 if (info->blocked_open) {
1162 if (info->close_delay) {
1163 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1165 wake_up_interruptible(&info->open_wait);
1167 info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1168 wake_up_interruptible(&info->close_wait);
1169 local_irq_restore(flags);
1173 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1175 void rs_hangup(struct tty_struct *tty)
1177 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1179 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1182 rs_flush_buffer(tty);
1186 info->flags &= ~S_NORMAL_ACTIVE;
1188 wake_up_interruptible(&info->open_wait);
1192 * ------------------------------------------------------------
1193 * rs_open() and friends
1194 * ------------------------------------------------------------
1196 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1197 struct m68k_serial *info)
1199 DECLARE_WAITQUEUE(wait, current);
1204 * If the device is in the middle of being closed, then block
1205 * until it's done, and then try again.
1207 if (info->flags & S_CLOSING) {
1208 interruptible_sleep_on(&info->close_wait);
1209 #ifdef SERIAL_DO_RESTART
1210 if (info->flags & S_HUP_NOTIFY)
1213 return -ERESTARTSYS;
1220 * If non-blocking mode is set, or the port is not enabled,
1221 * then make the check up front and then exit.
1223 if ((filp->f_flags & O_NONBLOCK) ||
1224 (tty->flags & (1 << TTY_IO_ERROR))) {
1225 info->flags |= S_NORMAL_ACTIVE;
1229 if (tty->termios->c_cflag & CLOCAL)
1233 * Block waiting for the carrier detect and the line to become
1234 * free (i.e., not in use by the callout). While we are in
1235 * this loop, info->count is dropped by one, so that
1236 * rs_close() knows when to free things. We restore it upon
1237 * exit, either normal or abnormal.
1240 add_wait_queue(&info->open_wait, &wait);
1243 info->blocked_open++;
1245 local_irq_disable();
1246 m68k_rtsdtr(info, 1);
1248 current->state = TASK_INTERRUPTIBLE;
1249 if (tty_hung_up_p(filp) ||
1250 !(info->flags & S_INITIALIZED)) {
1251 #ifdef SERIAL_DO_RESTART
1252 if (info->flags & S_HUP_NOTIFY)
1255 retval = -ERESTARTSYS;
1261 if (!(info->flags & S_CLOSING) && do_clocal)
1263 if (signal_pending(current)) {
1264 retval = -ERESTARTSYS;
1269 current->state = TASK_RUNNING;
1270 remove_wait_queue(&info->open_wait, &wait);
1271 if (!tty_hung_up_p(filp))
1273 info->blocked_open--;
1277 info->flags |= S_NORMAL_ACTIVE;
1282 * This routine is called whenever a serial port is opened. It
1283 * enables interrupts for a serial port, linking in its S structure into
1284 * the IRQ chain. It also performs the serial-specific
1285 * initialization for the tty structure.
1287 int rs_open(struct tty_struct *tty, struct file * filp)
1289 struct m68k_serial *info;
1294 if (line >= NR_PORTS || line < 0) /* we have exactly one */
1297 info = &m68k_soft[line];
1299 if (serial_paranoia_check(info, tty->name, "rs_open"))
1303 tty->driver_data = info;
1307 * Start up serial port
1309 retval = startup(info);
1313 return block_til_ready(tty, filp, info);
1316 /* Finally, routines used to initialize the serial driver. */
1318 static void show_serial_version(void)
1320 printk("MC68328 serial driver version 1.00\n");
1323 static const struct tty_operations rs_ops = {
1327 .flush_chars = rs_flush_chars,
1328 .write_room = rs_write_room,
1329 .chars_in_buffer = rs_chars_in_buffer,
1330 .flush_buffer = rs_flush_buffer,
1332 .throttle = rs_throttle,
1333 .unthrottle = rs_unthrottle,
1334 .set_termios = rs_set_termios,
1337 .hangup = rs_hangup,
1338 .set_ldisc = rs_set_ldisc,
1341 /* rs_init inits the driver */
1346 struct m68k_serial *info;
1348 serial_driver = alloc_tty_driver(NR_PORTS);
1352 show_serial_version();
1354 /* Initialize the tty_driver structure */
1355 /* SPARC: Not all of this is exactly right for us. */
1357 serial_driver->name = "ttyS";
1358 serial_driver->major = TTY_MAJOR;
1359 serial_driver->minor_start = 64;
1360 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1361 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1362 serial_driver->init_termios = tty_std_termios;
1363 serial_driver->init_termios.c_cflag =
1364 m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1365 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1366 tty_set_operations(serial_driver, &rs_ops);
1368 if (tty_register_driver(serial_driver)) {
1369 put_tty_driver(serial_driver);
1370 printk(KERN_ERR "Couldn't register serial driver\n");
1374 local_irq_save(flags);
1376 for(i=0;i<NR_PORTS;i++) {
1378 info = &m68k_soft[i];
1379 info->magic = SERIAL_MAGIC;
1380 info->port = (int) &uart_addr[i];
1382 info->irq = uart_irqs[i];
1383 info->custom_divisor = 16;
1384 info->close_delay = 50;
1385 info->closing_wait = 3000;
1389 info->blocked_open = 0;
1390 INIT_WORK(&info->tqueue, do_softint);
1391 INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
1392 init_waitqueue_head(&info->open_wait);
1393 init_waitqueue_head(&info->close_wait);
1395 info->is_cons = 1; /* Means shortcuts work */
1397 printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1398 info->port, info->irq);
1399 printk(" is a builtin MC68328 UART\n");
1401 IRQ_ports[info->irq] = info; /* waste of space */
1403 #ifdef CONFIG_M68VZ328
1405 PJSEL &= 0xCF; /* PSW enable second port output */
1408 if (request_irq(uart_irqs[i],
1411 "M68328_UART", NULL))
1412 panic("Unable to attach 68328 serial interrupt\n");
1414 local_irq_restore(flags);
1418 module_init(rs68328_init);
1422 static void m68328_set_baud(void)
1424 unsigned short ustcnt;
1428 USTCNT = ustcnt & ~USTCNT_TXEN;
1431 for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++)
1432 if (baud_table[i] == m68328_console_baud)
1434 if (i >= sizeof(baud_table) / sizeof(baud_table[0])) {
1435 m68328_console_baud = 9600;
1439 UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
1440 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1441 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1442 ustcnt |= USTCNT_8_7;
1443 ustcnt |= USTCNT_TXEN;
1445 m68328_console_initted = 1;
1450 int m68328_console_setup(struct console *cp, char *arg)
1452 int i, n = CONSOLE_BAUD_RATE;
1458 n = simple_strtoul(arg,NULL,0);
1460 for (i = 0; i < BAUD_TABLE_SIZE; i++)
1461 if (baud_table[i] == n)
1463 if (i < BAUD_TABLE_SIZE) {
1464 m68328_console_baud = n;
1465 m68328_console_cbaud = 0;
1467 m68328_console_cbaud |= CBAUDEX;
1470 m68328_console_cbaud |= i;
1473 m68328_set_baud(); /* make sure baud rate changes */
1478 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1481 return serial_driver;
1485 void m68328_console_write (struct console *co, const char *str,
1488 if (!m68328_console_initted)
1493 rs_put_char( *str++ );
1498 static struct console m68328_driver = {
1500 .write = m68328_console_write,
1501 .device = m68328_console_device,
1502 .setup = m68328_console_setup,
1503 .flags = CON_PRINTBUFFER,
1508 static int __init m68328_console_init(void)
1510 register_console(&m68328_driver);
1514 console_initcall(m68328_console_init);