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>
38 #include <linux/gfp.h>
42 #include <asm/system.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];
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 */
81 struct tty_driver *serial_driver;
83 /* number of characters left in xmit buffer before we ask for more */
84 #define WAKEUP_CHARS 256
86 /* Debugging... DEBUG_INTR is bad to use when one of the zs
87 * lines is your console ;(
89 #undef SERIAL_DEBUG_INTR
90 #undef SERIAL_DEBUG_OPEN
91 #undef SERIAL_DEBUG_FLOW
93 #define RS_ISR_PASS_LIMIT 256
95 static void change_speed(struct m68k_serial *info);
98 * Setup for console. Argument comes from the boot command line.
101 /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
102 #ifdef CONFIG_M68VZ328
103 #define CONSOLE_BAUD_RATE 19200
104 #define DEFAULT_CBAUD B19200
108 #ifndef CONSOLE_BAUD_RATE
109 #define CONSOLE_BAUD_RATE 9600
110 #define DEFAULT_CBAUD B9600
114 static int m68328_console_initted = 0;
115 static int m68328_console_baud = CONSOLE_BAUD_RATE;
116 static int m68328_console_cbaud = DEFAULT_CBAUD;
119 static inline int serial_paranoia_check(struct m68k_serial *info,
120 char *name, const char *routine)
122 #ifdef SERIAL_PARANOIA_CHECK
123 static const char *badmagic =
124 "Warning: bad magic number for serial struct %s in %s\n";
125 static const char *badinfo =
126 "Warning: null m68k_serial for %s in %s\n";
129 printk(badinfo, name, routine);
132 if (info->magic != SERIAL_MAGIC) {
133 printk(badmagic, name, routine);
141 * This is used to figure out the divisor speeds and the timeouts
143 static int baud_table[] = {
144 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
145 9600, 19200, 38400, 57600, 115200, 0 };
147 /* Sets or clears DTR/RTS on the requested line */
148 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
151 /* set the RTS/CTS line */
158 /* Utility routines */
159 static inline int get_baud(struct m68k_serial *ss)
161 unsigned long result = 115200;
162 unsigned short int baud = uart_addr[ss->line].ubaud;
163 if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
164 result >>= GET_FIELD(baud, UBAUD_DIVIDE);
170 * ------------------------------------------------------------
171 * rs_stop() and rs_start()
173 * This routines are called before setting or resetting tty->stopped.
174 * They enable or disable transmitter interrupts, as necessary.
175 * ------------------------------------------------------------
177 static void rs_stop(struct tty_struct *tty)
179 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
180 m68328_uart *uart = &uart_addr[info->line];
183 if (serial_paranoia_check(info, tty->name, "rs_stop"))
186 local_irq_save(flags);
187 uart->ustcnt &= ~USTCNT_TXEN;
188 local_irq_restore(flags);
191 static int rs_put_char(char ch)
193 int flags, loops = 0;
195 local_irq_save(flags);
197 while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
204 local_irq_restore(flags);
208 static void rs_start(struct tty_struct *tty)
210 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
211 m68328_uart *uart = &uart_addr[info->line];
214 if (serial_paranoia_check(info, tty->name, "rs_start"))
217 local_irq_save(flags);
218 if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
220 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
222 uart->ustcnt |= USTCNT_TXEN;
225 local_irq_restore(flags);
228 /* Drop into either the boot monitor or kadb upon receiving a break
229 * from keyboard/console input.
231 static void batten_down_hatches(void)
233 /* Drop into the debugger */
236 static void status_handle(struct m68k_serial *info, unsigned short status)
238 /* If this is console input and this is a
239 * 'break asserted' status change interrupt
240 * see if we can drop into the debugger
242 if((status & URX_BREAK) && info->break_abort)
243 batten_down_hatches();
247 static void receive_chars(struct m68k_serial *info, unsigned short rx)
249 struct tty_struct *tty = info->tty;
250 m68328_uart *uart = &uart_addr[info->line];
251 unsigned char ch, flag;
254 * This do { } while() loop will get ALL chars out of Rx FIFO
256 #ifndef CONFIG_XCOPILOT_BUGS
259 ch = GET_FIELD(rx, URX_RXDATA);
262 if(URX_BREAK & rx) { /* whee, break received */
263 status_handle(info, rx);
265 #ifdef CONFIG_MAGIC_SYSRQ
266 } else if (ch == 0x10) { /* ^P */
270 /* show_net_buffers(); */
272 } else if (ch == 0x12) { /* ^R */
275 #endif /* CONFIG_MAGIC_SYSRQ */
284 if(rx & URX_PARITY_ERROR) {
286 status_handle(info, rx);
287 } else if(rx & URX_OVRUN) {
289 status_handle(info, rx);
290 } else if(rx & URX_FRAME_ERROR) {
292 status_handle(info, rx);
294 tty_insert_flip_char(tty, ch, flag);
295 #ifndef CONFIG_XCOPILOT_BUGS
296 } while((rx = uart->urx.w) & URX_DATA_READY);
299 tty_schedule_flip(tty);
305 static void transmit_chars(struct m68k_serial *info)
307 m68328_uart *uart = &uart_addr[info->line];
311 uart->utx.b.txdata = info->x_char;
313 goto clear_and_return;
316 if((info->xmit_cnt <= 0) || info->tty->stopped) {
317 /* That's peculiar... TX ints off */
318 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
319 goto clear_and_return;
323 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
324 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
327 if(info->xmit_cnt <= 0) {
328 /* All done for now... TX ints off */
329 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
330 goto clear_and_return;
334 /* Clear interrupt (should be auto)*/
339 * This is the serial driver's generic interrupt routine
341 irqreturn_t rs_interrupt(int irq, void *dev_id)
343 struct m68k_serial *info = dev_id;
348 uart = &uart_addr[info->line];
354 if (rx & URX_DATA_READY) receive_chars(info, rx);
355 if (tx & UTX_TX_AVAIL) transmit_chars(info);
357 receive_chars(info, rx);
362 static int startup(struct m68k_serial * info)
364 m68328_uart *uart = &uart_addr[info->line];
367 if (info->flags & S_INITIALIZED)
370 if (!info->xmit_buf) {
371 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
376 local_irq_save(flags);
379 * Clear the FIFO buffers and disable them
380 * (they will be reenabled in change_speed())
383 uart->ustcnt = USTCNT_UEN;
384 info->xmit_fifo_size = 1;
385 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
389 * Finally, enable sequencing and interrupts
392 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
393 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
395 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
399 clear_bit(TTY_IO_ERROR, &info->tty->flags);
400 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
403 * and set the speed of the serial port
408 info->flags |= S_INITIALIZED;
409 local_irq_restore(flags);
414 * This routine will shutdown a serial port; interrupts are disabled, and
415 * DTR is dropped if the hangup on close termio flag is on.
417 static void shutdown(struct m68k_serial * info)
419 m68328_uart *uart = &uart_addr[info->line];
422 uart->ustcnt = 0; /* All off! */
423 if (!(info->flags & S_INITIALIZED))
426 local_irq_save(flags);
428 if (info->xmit_buf) {
429 free_page((unsigned long) info->xmit_buf);
434 set_bit(TTY_IO_ERROR, &info->tty->flags);
436 info->flags &= ~S_INITIALIZED;
437 local_irq_restore(flags);
441 int divisor, prescale;
443 #ifndef CONFIG_M68VZ328
444 hw_baud_table[18] = {
459 {1,0x26}, /* 19200 */
460 {0,0x26}, /* 38400 */
461 {1,0x38}, /* 57600 */
462 {0,0x38}, /* 115200 */
465 hw_baud_table[18] = {
480 {2,0x26}, /* 19200 */
481 {1,0x26}, /* 38400 */
482 {0,0x26}, /* 57600 */
483 {1,0x38}, /* 115200 */
486 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
489 * This routine is called to set the UART divisor registers to match
490 * the specified baud rate for a serial port.
492 static void change_speed(struct m68k_serial *info)
494 m68328_uart *uart = &uart_addr[info->line];
496 unsigned short ustcnt;
500 if (!info->tty || !info->tty->termios)
502 cflag = info->tty->termios->c_cflag;
503 if (!(port = info->port))
506 ustcnt = uart->ustcnt;
507 uart->ustcnt = ustcnt & ~USTCNT_TXEN;
511 i = (i & ~CBAUDEX) + B38400;
514 info->baud = baud_table[i];
515 uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
516 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
518 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
520 if ((cflag & CSIZE) == CS8)
521 ustcnt |= USTCNT_8_7;
524 ustcnt |= USTCNT_STOP;
527 ustcnt |= USTCNT_PARITYEN;
529 ustcnt |= USTCNT_ODD_EVEN;
531 #ifdef CONFIG_SERIAL_68328_RTS_CTS
532 if (cflag & CRTSCTS) {
533 uart->utx.w &= ~ UTX_NOCTS;
535 uart->utx.w |= UTX_NOCTS;
539 ustcnt |= USTCNT_TXEN;
541 uart->ustcnt = ustcnt;
546 * Fair output driver allows a process to speak.
548 static void rs_fair_output(void)
550 int left; /* Output no more than that */
552 struct m68k_serial *info = &m68k_soft[0];
555 if (info == 0) return;
556 if (info->xmit_buf == 0) return;
558 local_irq_save(flags);
559 left = info->xmit_cnt;
561 c = info->xmit_buf[info->xmit_tail];
562 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
564 local_irq_restore(flags);
568 local_irq_save(flags);
569 left = min(info->xmit_cnt, left-1);
572 /* Last character is being transmitted now (hopefully). */
575 local_irq_restore(flags);
580 * m68k_console_print is registered for printk.
582 void console_print_68328(const char *p)
586 while((c=*(p++)) != 0) {
592 /* Comment this if you want to have a strict interrupt-driven output */
598 static void rs_set_ldisc(struct tty_struct *tty)
600 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
602 if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
605 info->is_cons = (tty->termios->c_line == N_TTY);
607 printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
610 static void rs_flush_chars(struct tty_struct *tty)
612 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
613 m68328_uart *uart = &uart_addr[info->line];
616 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
622 /* Enable transmitter */
623 local_irq_save(flags);
625 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
627 local_irq_restore(flags);
632 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
634 uart->ustcnt |= USTCNT_TXEN;
638 if (uart->utx.w & UTX_TX_AVAIL) {
643 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
644 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
649 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
652 local_irq_restore(flags);
655 extern void console_printn(const char * b, int count);
657 static int rs_write(struct tty_struct * tty,
658 const unsigned char *buf, int count)
661 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
662 m68328_uart *uart = &uart_addr[info->line];
665 if (serial_paranoia_check(info, tty->name, "rs_write"))
668 if (!tty || !info->xmit_buf)
671 local_save_flags(flags);
674 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
675 SERIAL_XMIT_SIZE - info->xmit_head));
676 local_irq_restore(flags);
681 memcpy(info->xmit_buf + info->xmit_head, buf, c);
684 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
686 local_irq_restore(flags);
692 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
693 /* Enable transmitter */
696 while(info->xmit_cnt) {
699 uart->ustcnt |= USTCNT_TXEN;
701 uart->ustcnt |= USTCNT_TX_INTR_MASK;
703 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
705 if (uart->utx.w & UTX_TX_AVAIL) {
706 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
707 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
714 local_irq_restore(flags);
720 static int rs_write_room(struct tty_struct *tty)
722 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
725 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
727 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
733 static int rs_chars_in_buffer(struct tty_struct *tty)
735 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
737 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
739 return info->xmit_cnt;
742 static void rs_flush_buffer(struct tty_struct *tty)
744 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
747 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
749 local_irq_save(flags);
750 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
751 local_irq_restore(flags);
756 * ------------------------------------------------------------
759 * This routine is called by the upper-layer tty layer to signal that
760 * incoming characters should be throttled.
761 * ------------------------------------------------------------
763 static void rs_throttle(struct tty_struct * tty)
765 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
767 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
771 info->x_char = STOP_CHAR(tty);
773 /* Turn off RTS line (do this atomic) */
776 static void rs_unthrottle(struct tty_struct * tty)
778 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
780 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
787 info->x_char = START_CHAR(tty);
790 /* Assert RTS line (do this atomic) */
794 * ------------------------------------------------------------
795 * rs_ioctl() and friends
796 * ------------------------------------------------------------
799 static int get_serial_info(struct m68k_serial * info,
800 struct serial_struct * retinfo)
802 struct serial_struct tmp;
806 memset(&tmp, 0, sizeof(tmp));
807 tmp.type = info->type;
808 tmp.line = info->line;
809 tmp.port = info->port;
811 tmp.flags = info->flags;
812 tmp.baud_base = info->baud_base;
813 tmp.close_delay = info->close_delay;
814 tmp.closing_wait = info->closing_wait;
815 tmp.custom_divisor = info->custom_divisor;
816 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
822 static int set_serial_info(struct m68k_serial * info,
823 struct serial_struct * new_info)
825 struct serial_struct new_serial;
826 struct m68k_serial old_info;
831 if (copy_from_user(&new_serial, new_info, sizeof(new_serial)))
835 if (!capable(CAP_SYS_ADMIN)) {
836 if ((new_serial.baud_base != info->baud_base) ||
837 (new_serial.type != info->type) ||
838 (new_serial.close_delay != info->close_delay) ||
839 ((new_serial.flags & ~S_USR_MASK) !=
840 (info->flags & ~S_USR_MASK)))
842 info->flags = ((info->flags & ~S_USR_MASK) |
843 (new_serial.flags & S_USR_MASK));
844 info->custom_divisor = new_serial.custom_divisor;
852 * OK, past this point, all the error checking has been done.
853 * At this point, we start making changes.....
856 info->baud_base = new_serial.baud_base;
857 info->flags = ((info->flags & ~S_FLAGS) |
858 (new_serial.flags & S_FLAGS));
859 info->type = new_serial.type;
860 info->close_delay = new_serial.close_delay;
861 info->closing_wait = new_serial.closing_wait;
864 retval = startup(info);
869 * get_lsr_info - get line status register info
871 * Purpose: Let user call ioctl() to get info when the UART physically
872 * is emptied. On bus types like RS485, the transmitter must
873 * release the bus after transmitting. This must be done when
874 * the transmit shift register is empty, not be done when the
875 * transmit holding register is empty. This functionality
876 * allows an RS485 driver to be written in user space.
878 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
880 #ifdef CONFIG_SERIAL_68328_RTS_CTS
881 m68328_uart *uart = &uart_addr[info->line];
883 unsigned char status;
886 local_irq_save(flags);
887 #ifdef CONFIG_SERIAL_68328_RTS_CTS
888 status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
892 local_irq_restore(flags);
893 return put_user(status, value);
897 * This routine sends a break character out the serial port.
899 static void send_break(struct m68k_serial * info, unsigned int duration)
901 m68328_uart *uart = &uart_addr[info->line];
905 local_irq_save(flags);
907 uart->utx.w |= UTX_SEND_BREAK;
908 msleep_interruptible(duration);
909 uart->utx.w &= ~UTX_SEND_BREAK;
911 local_irq_restore(flags);
914 static int rs_ioctl(struct tty_struct *tty,
915 unsigned int cmd, unsigned long arg)
917 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
920 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
923 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
924 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
925 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
926 if (tty->flags & (1 << TTY_IO_ERROR))
931 case TCSBRK: /* SVID version: non-zero arg --> no break */
932 retval = tty_check_change(tty);
935 tty_wait_until_sent(tty, 0);
937 send_break(info, 250); /* 1/4 second */
939 case TCSBRKP: /* support for POSIX tcsendbreak() */
940 retval = tty_check_change(tty);
943 tty_wait_until_sent(tty, 0);
944 send_break(info, arg ? arg*(100) : 250);
947 return get_serial_info(info,
948 (struct serial_struct *) arg);
950 return set_serial_info(info,
951 (struct serial_struct *) arg);
952 case TIOCSERGETLSR: /* Get line status register */
953 return get_lsr_info(info, (unsigned int *) arg);
955 if (copy_to_user((struct m68k_serial *) arg,
956 info, sizeof(struct m68k_serial)))
965 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
967 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
971 if ((old_termios->c_cflag & CRTSCTS) &&
972 !(tty->termios->c_cflag & CRTSCTS)) {
980 * ------------------------------------------------------------
983 * This routine is called when the serial port gets closed. First, we
984 * wait for the last remaining data to be sent. Then, we unlink its
985 * S structure from the interrupt chain if necessary, and we free
986 * that IRQ if nothing is left in the chain.
987 * ------------------------------------------------------------
989 static void rs_close(struct tty_struct *tty, struct file * filp)
991 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
992 m68328_uart *uart = &uart_addr[info->line];
995 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
998 local_irq_save(flags);
1000 if (tty_hung_up_p(filp)) {
1001 local_irq_restore(flags);
1005 if ((tty->count == 1) && (info->count != 1)) {
1007 * Uh, oh. tty->count is 1, which means that the tty
1008 * structure will be freed. Info->count should always
1009 * be one in these conditions. If it's greater than
1010 * one, we've got real problems, since it means the
1011 * serial port won't be shutdown.
1013 printk("rs_close: bad serial port count; tty->count is 1, "
1014 "info->count is %d\n", info->count);
1017 if (--info->count < 0) {
1018 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1019 info->line, info->count);
1023 local_irq_restore(flags);
1026 info->flags |= S_CLOSING;
1028 * Now we wait for the transmit buffer to clear; and we notify
1029 * the line discipline to only process XON/XOFF characters.
1032 if (info->closing_wait != S_CLOSING_WAIT_NONE)
1033 tty_wait_until_sent(tty, info->closing_wait);
1035 * At this point we stop accepting input. To do this, we
1036 * disable the receive line status interrupts, and tell the
1037 * interrupt driver to stop checking the data ready bit in the
1038 * line status register.
1041 uart->ustcnt &= ~USTCNT_RXEN;
1042 uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1045 rs_flush_buffer(tty);
1047 tty_ldisc_flush(tty);
1051 #warning "This is not and has never been valid so fix it"
1053 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1054 if (tty->ldisc.close)
1055 (tty->ldisc.close)(tty);
1056 tty->ldisc = ldiscs[N_TTY];
1057 tty->termios->c_line = N_TTY;
1058 if (tty->ldisc.open)
1059 (tty->ldisc.open)(tty);
1062 if (info->blocked_open) {
1063 if (info->close_delay) {
1064 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1066 wake_up_interruptible(&info->open_wait);
1068 info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1069 wake_up_interruptible(&info->close_wait);
1070 local_irq_restore(flags);
1074 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1076 void rs_hangup(struct tty_struct *tty)
1078 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1080 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1083 rs_flush_buffer(tty);
1087 info->flags &= ~S_NORMAL_ACTIVE;
1089 wake_up_interruptible(&info->open_wait);
1093 * ------------------------------------------------------------
1094 * rs_open() and friends
1095 * ------------------------------------------------------------
1097 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1098 struct m68k_serial *info)
1100 DECLARE_WAITQUEUE(wait, current);
1105 * If the device is in the middle of being closed, then block
1106 * until it's done, and then try again.
1108 if (info->flags & S_CLOSING) {
1109 interruptible_sleep_on(&info->close_wait);
1110 #ifdef SERIAL_DO_RESTART
1111 if (info->flags & S_HUP_NOTIFY)
1114 return -ERESTARTSYS;
1121 * If non-blocking mode is set, or the port is not enabled,
1122 * then make the check up front and then exit.
1124 if ((filp->f_flags & O_NONBLOCK) ||
1125 (tty->flags & (1 << TTY_IO_ERROR))) {
1126 info->flags |= S_NORMAL_ACTIVE;
1130 if (tty->termios->c_cflag & CLOCAL)
1134 * Block waiting for the carrier detect and the line to become
1135 * free (i.e., not in use by the callout). While we are in
1136 * this loop, info->count is dropped by one, so that
1137 * rs_close() knows when to free things. We restore it upon
1138 * exit, either normal or abnormal.
1141 add_wait_queue(&info->open_wait, &wait);
1144 info->blocked_open++;
1146 local_irq_disable();
1147 m68k_rtsdtr(info, 1);
1149 current->state = TASK_INTERRUPTIBLE;
1150 if (tty_hung_up_p(filp) ||
1151 !(info->flags & S_INITIALIZED)) {
1152 #ifdef SERIAL_DO_RESTART
1153 if (info->flags & S_HUP_NOTIFY)
1156 retval = -ERESTARTSYS;
1162 if (!(info->flags & S_CLOSING) && do_clocal)
1164 if (signal_pending(current)) {
1165 retval = -ERESTARTSYS;
1172 current->state = TASK_RUNNING;
1173 remove_wait_queue(&info->open_wait, &wait);
1174 if (!tty_hung_up_p(filp))
1176 info->blocked_open--;
1180 info->flags |= S_NORMAL_ACTIVE;
1185 * This routine is called whenever a serial port is opened. It
1186 * enables interrupts for a serial port, linking in its S structure into
1187 * the IRQ chain. It also performs the serial-specific
1188 * initialization for the tty structure.
1190 int rs_open(struct tty_struct *tty, struct file * filp)
1192 struct m68k_serial *info;
1197 if (line >= NR_PORTS || line < 0) /* we have exactly one */
1200 info = &m68k_soft[line];
1202 if (serial_paranoia_check(info, tty->name, "rs_open"))
1206 tty->driver_data = info;
1210 * Start up serial port
1212 retval = startup(info);
1216 return block_til_ready(tty, filp, info);
1219 /* Finally, routines used to initialize the serial driver. */
1221 static void show_serial_version(void)
1223 printk("MC68328 serial driver version 1.00\n");
1226 static const struct tty_operations rs_ops = {
1230 .flush_chars = rs_flush_chars,
1231 .write_room = rs_write_room,
1232 .chars_in_buffer = rs_chars_in_buffer,
1233 .flush_buffer = rs_flush_buffer,
1235 .throttle = rs_throttle,
1236 .unthrottle = rs_unthrottle,
1237 .set_termios = rs_set_termios,
1240 .hangup = rs_hangup,
1241 .set_ldisc = rs_set_ldisc,
1244 /* rs_init inits the driver */
1249 struct m68k_serial *info;
1251 serial_driver = alloc_tty_driver(NR_PORTS);
1255 show_serial_version();
1257 /* Initialize the tty_driver structure */
1258 /* SPARC: Not all of this is exactly right for us. */
1260 serial_driver->name = "ttyS";
1261 serial_driver->major = TTY_MAJOR;
1262 serial_driver->minor_start = 64;
1263 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1264 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1265 serial_driver->init_termios = tty_std_termios;
1266 serial_driver->init_termios.c_cflag =
1267 m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1268 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1269 tty_set_operations(serial_driver, &rs_ops);
1271 if (tty_register_driver(serial_driver)) {
1272 put_tty_driver(serial_driver);
1273 printk(KERN_ERR "Couldn't register serial driver\n");
1277 local_irq_save(flags);
1279 for(i=0;i<NR_PORTS;i++) {
1281 info = &m68k_soft[i];
1282 info->magic = SERIAL_MAGIC;
1283 info->port = (int) &uart_addr[i];
1285 info->irq = uart_irqs[i];
1286 info->custom_divisor = 16;
1287 info->close_delay = 50;
1288 info->closing_wait = 3000;
1292 info->blocked_open = 0;
1293 init_waitqueue_head(&info->open_wait);
1294 init_waitqueue_head(&info->close_wait);
1296 info->is_cons = 1; /* Means shortcuts work */
1298 printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1299 info->port, info->irq);
1300 printk(" is a builtin MC68328 UART\n");
1302 #ifdef CONFIG_M68VZ328
1304 PJSEL &= 0xCF; /* PSW enable second port output */
1307 if (request_irq(uart_irqs[i],
1310 "M68328_UART", info))
1311 panic("Unable to attach 68328 serial interrupt\n");
1313 local_irq_restore(flags);
1317 module_init(rs68328_init);
1321 static void m68328_set_baud(void)
1323 unsigned short ustcnt;
1327 USTCNT = ustcnt & ~USTCNT_TXEN;
1330 for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1331 if (baud_table[i] == m68328_console_baud)
1333 if (i >= ARRAY_SIZE(baud_table)) {
1334 m68328_console_baud = 9600;
1338 UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
1339 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1340 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1341 ustcnt |= USTCNT_8_7;
1342 ustcnt |= USTCNT_TXEN;
1344 m68328_console_initted = 1;
1349 int m68328_console_setup(struct console *cp, char *arg)
1351 int i, n = CONSOLE_BAUD_RATE;
1357 n = simple_strtoul(arg,NULL,0);
1359 for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1360 if (baud_table[i] == n)
1362 if (i < ARRAY_SIZE(baud_table)) {
1363 m68328_console_baud = n;
1364 m68328_console_cbaud = 0;
1366 m68328_console_cbaud |= CBAUDEX;
1369 m68328_console_cbaud |= i;
1372 m68328_set_baud(); /* make sure baud rate changes */
1377 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1380 return serial_driver;
1384 void m68328_console_write (struct console *co, const char *str,
1387 if (!m68328_console_initted)
1392 rs_put_char( *str++ );
1397 static struct console m68328_driver = {
1399 .write = m68328_console_write,
1400 .device = m68328_console_device,
1401 .setup = m68328_console_setup,
1402 .flags = CON_PRINTBUFFER,
1407 static int __init m68328_console_init(void)
1409 register_console(&m68328_driver);
1413 console_initcall(m68328_console_init);