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 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
102 #define CONSOLE_BAUD_RATE 115200
103 #define DEFAULT_CBAUD B115200
106 /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
107 #ifdef CONFIG_M68VZ328
108 #define CONSOLE_BAUD_RATE 19200
109 #define DEFAULT_CBAUD B19200
114 #ifndef CONSOLE_BAUD_RATE
115 #define CONSOLE_BAUD_RATE 9600
116 #define DEFAULT_CBAUD B9600
120 static int m68328_console_initted = 0;
121 static int m68328_console_baud = CONSOLE_BAUD_RATE;
122 static int m68328_console_cbaud = DEFAULT_CBAUD;
125 static inline int serial_paranoia_check(struct m68k_serial *info,
126 char *name, const char *routine)
128 #ifdef SERIAL_PARANOIA_CHECK
129 static const char *badmagic =
130 "Warning: bad magic number for serial struct %s in %s\n";
131 static const char *badinfo =
132 "Warning: null m68k_serial for %s in %s\n";
135 printk(badinfo, name, routine);
138 if (info->magic != SERIAL_MAGIC) {
139 printk(badmagic, name, routine);
147 * This is used to figure out the divisor speeds and the timeouts
149 static int baud_table[] = {
150 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
151 9600, 19200, 38400, 57600, 115200, 0 };
153 /* Sets or clears DTR/RTS on the requested line */
154 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
157 /* set the RTS/CTS line */
164 /* Utility routines */
165 static inline int get_baud(struct m68k_serial *ss)
167 unsigned long result = 115200;
168 unsigned short int baud = uart_addr[ss->line].ubaud;
169 if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
170 result >>= GET_FIELD(baud, UBAUD_DIVIDE);
176 * ------------------------------------------------------------
177 * rs_stop() and rs_start()
179 * This routines are called before setting or resetting tty->stopped.
180 * They enable or disable transmitter interrupts, as necessary.
181 * ------------------------------------------------------------
183 static void rs_stop(struct tty_struct *tty)
185 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
186 m68328_uart *uart = &uart_addr[info->line];
189 if (serial_paranoia_check(info, tty->name, "rs_stop"))
192 local_irq_save(flags);
193 uart->ustcnt &= ~USTCNT_TXEN;
194 local_irq_restore(flags);
197 static int rs_put_char(char ch)
199 int flags, loops = 0;
201 local_irq_save(flags);
203 while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
210 local_irq_restore(flags);
214 static void rs_start(struct tty_struct *tty)
216 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
217 m68328_uart *uart = &uart_addr[info->line];
220 if (serial_paranoia_check(info, tty->name, "rs_start"))
223 local_irq_save(flags);
224 if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
226 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
228 uart->ustcnt |= USTCNT_TXEN;
231 local_irq_restore(flags);
234 /* Drop into either the boot monitor or kadb upon receiving a break
235 * from keyboard/console input.
237 static void batten_down_hatches(void)
239 /* Drop into the debugger */
242 static void status_handle(struct m68k_serial *info, unsigned short status)
246 if((info->port.tty->termios->c_cflag & CRTSCTS) &&
247 ((info->curregs[3] & AUTO_ENAB)==0)) {
248 info->curregs[3] |= AUTO_ENAB;
249 info->pendregs[3] |= AUTO_ENAB;
250 write_zsreg(info->m68k_channel, 3, info->curregs[3]);
253 if((info->curregs[3] & AUTO_ENAB)) {
254 info->curregs[3] &= ~AUTO_ENAB;
255 info->pendregs[3] &= ~AUTO_ENAB;
256 write_zsreg(info->m68k_channel, 3, info->curregs[3]);
260 /* If this is console input and this is a
261 * 'break asserted' status change interrupt
262 * see if we can drop into the debugger
264 if((status & URX_BREAK) && info->break_abort)
265 batten_down_hatches();
269 static void receive_chars(struct m68k_serial *info, unsigned short rx)
271 struct tty_struct *tty = info->port.tty;
272 m68328_uart *uart = &uart_addr[info->line];
273 unsigned char ch, flag;
276 * This do { } while() loop will get ALL chars out of Rx FIFO
278 #ifndef CONFIG_XCOPILOT_BUGS
281 ch = GET_FIELD(rx, URX_RXDATA);
284 if(URX_BREAK & rx) { /* whee, break received */
285 status_handle(info, rx);
287 #ifdef CONFIG_MAGIC_SYSRQ
288 } else if (ch == 0x10) { /* ^P */
292 /* show_net_buffers(); */
294 } else if (ch == 0x12) { /* ^R */
297 #endif /* CONFIG_MAGIC_SYSRQ */
306 if(rx & URX_PARITY_ERROR) {
308 status_handle(info, rx);
309 } else if(rx & URX_OVRUN) {
311 status_handle(info, rx);
312 } else if(rx & URX_FRAME_ERROR) {
314 status_handle(info, rx);
316 tty_insert_flip_char(tty, ch, flag);
317 #ifndef CONFIG_XCOPILOT_BUGS
318 } while((rx = uart->urx.w) & URX_DATA_READY);
321 tty_schedule_flip(tty);
327 static void transmit_chars(struct m68k_serial *info)
329 m68328_uart *uart = &uart_addr[info->line];
333 uart->utx.b.txdata = info->x_char;
335 goto clear_and_return;
338 if((info->xmit_cnt <= 0) || info->port.tty->stopped) {
339 /* That's peculiar... TX ints off */
340 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
341 goto clear_and_return;
345 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
346 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
349 if (info->xmit_cnt < WAKEUP_CHARS)
350 schedule_work(&info->tqueue);
352 if(info->xmit_cnt <= 0) {
353 /* All done for now... TX ints off */
354 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
355 goto clear_and_return;
359 /* Clear interrupt (should be auto)*/
364 * This is the serial driver's generic interrupt routine
366 irqreturn_t rs_interrupt(int irq, void *dev_id)
368 struct m68k_serial *info = dev_id;
373 uart = &uart_addr[info->line];
379 if (rx & URX_DATA_READY) receive_chars(info, rx);
380 if (tx & UTX_TX_AVAIL) transmit_chars(info);
382 receive_chars(info, rx);
387 static void do_softint(struct work_struct *work)
389 struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue);
390 struct tty_struct *tty;
392 tty = info->port.tty;
396 if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
403 * This routine is called from the scheduler tqueue when the interrupt
404 * routine has signalled that a hangup has occurred. The path of
405 * hangup processing is:
407 * serial interrupt routine -> (scheduler tqueue) ->
408 * do_serial_hangup() -> tty->hangup() -> rs_hangup()
411 static void do_serial_hangup(struct work_struct *work)
413 struct m68k_serial *info = container_of(work, struct m68k_serial, tqueue_hangup);
414 struct tty_struct *tty;
416 tty = info->port.tty;
424 static int startup(struct m68k_serial * info)
426 m68328_uart *uart = &uart_addr[info->line];
429 if (info->flags & S_INITIALIZED)
432 if (!info->xmit_buf) {
433 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
438 local_irq_save(flags);
441 * Clear the FIFO buffers and disable them
442 * (they will be reenabled in change_speed())
445 uart->ustcnt = USTCNT_UEN;
446 info->xmit_fifo_size = 1;
447 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
451 * Finally, enable sequencing and interrupts
454 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
455 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
457 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
461 clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
462 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
465 * and set the speed of the serial port
470 info->flags |= S_INITIALIZED;
471 local_irq_restore(flags);
476 * This routine will shutdown a serial port; interrupts are disabled, and
477 * DTR is dropped if the hangup on close termio flag is on.
479 static void shutdown(struct m68k_serial * info)
481 m68328_uart *uart = &uart_addr[info->line];
484 uart->ustcnt = 0; /* All off! */
485 if (!(info->flags & S_INITIALIZED))
488 local_irq_save(flags);
490 if (info->xmit_buf) {
491 free_page((unsigned long) info->xmit_buf);
496 set_bit(TTY_IO_ERROR, &info->port.tty->flags);
498 info->flags &= ~S_INITIALIZED;
499 local_irq_restore(flags);
503 int divisor, prescale;
505 #ifndef CONFIG_M68VZ328
506 hw_baud_table[18] = {
521 {1,0x26}, /* 19200 */
522 {0,0x26}, /* 38400 */
523 {1,0x38}, /* 57600 */
524 {0,0x38}, /* 115200 */
527 hw_baud_table[18] = {
542 {2,0x26}, /* 19200 */
543 {1,0x26}, /* 38400 */
544 {0,0x26}, /* 57600 */
545 {1,0x38}, /* 115200 */
548 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
551 * This routine is called to set the UART divisor registers to match
552 * the specified baud rate for a serial port.
554 static void change_speed(struct m68k_serial *info)
556 m68328_uart *uart = &uart_addr[info->line];
558 unsigned short ustcnt;
562 if (!info->port.tty || !info->port.tty->termios)
564 cflag = info->port.tty->termios->c_cflag;
565 if (!(port = info->port))
568 ustcnt = uart->ustcnt;
569 uart->ustcnt = ustcnt & ~USTCNT_TXEN;
573 i = (i & ~CBAUDEX) + B38400;
576 info->baud = baud_table[i];
577 uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
578 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
580 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
582 if ((cflag & CSIZE) == CS8)
583 ustcnt |= USTCNT_8_7;
586 ustcnt |= USTCNT_STOP;
589 ustcnt |= USTCNT_PARITYEN;
591 ustcnt |= USTCNT_ODD_EVEN;
593 #ifdef CONFIG_SERIAL_68328_RTS_CTS
594 if (cflag & CRTSCTS) {
595 uart->utx.w &= ~ UTX_NOCTS;
597 uart->utx.w |= UTX_NOCTS;
601 ustcnt |= USTCNT_TXEN;
603 uart->ustcnt = ustcnt;
608 * Fair output driver allows a process to speak.
610 static void rs_fair_output(void)
612 int left; /* Output no more than that */
614 struct m68k_serial *info = &m68k_soft[0];
617 if (info == 0) return;
618 if (info->xmit_buf == 0) return;
620 local_irq_save(flags);
621 left = info->xmit_cnt;
623 c = info->xmit_buf[info->xmit_tail];
624 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
626 local_irq_restore(flags);
630 local_irq_save(flags);
631 left = min(info->xmit_cnt, left-1);
634 /* Last character is being transmitted now (hopefully). */
637 local_irq_restore(flags);
642 * m68k_console_print is registered for printk.
644 void console_print_68328(const char *p)
648 while((c=*(p++)) != 0) {
654 /* Comment this if you want to have a strict interrupt-driven output */
660 static void rs_set_ldisc(struct tty_struct *tty)
662 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
664 if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
667 info->is_cons = (tty->termios->c_line == N_TTY);
669 printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
672 static void rs_flush_chars(struct tty_struct *tty)
674 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
675 m68328_uart *uart = &uart_addr[info->line];
678 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
684 /* Enable transmitter */
685 local_irq_save(flags);
687 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
689 local_irq_restore(flags);
694 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
696 uart->ustcnt |= USTCNT_TXEN;
700 if (uart->utx.w & UTX_TX_AVAIL) {
705 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
706 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
711 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
714 local_irq_restore(flags);
717 extern void console_printn(const char * b, int count);
719 static int rs_write(struct tty_struct * tty,
720 const unsigned char *buf, int count)
723 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
724 m68328_uart *uart = &uart_addr[info->line];
727 if (serial_paranoia_check(info, tty->name, "rs_write"))
730 if (!tty || !info->xmit_buf)
733 local_save_flags(flags);
736 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
737 SERIAL_XMIT_SIZE - info->xmit_head));
738 local_irq_restore(flags);
743 memcpy(info->xmit_buf + info->xmit_head, buf, c);
746 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
748 local_irq_restore(flags);
754 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
755 /* Enable transmitter */
758 while(info->xmit_cnt) {
761 uart->ustcnt |= USTCNT_TXEN;
763 uart->ustcnt |= USTCNT_TX_INTR_MASK;
765 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
767 if (uart->utx.w & UTX_TX_AVAIL) {
768 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
769 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
776 local_irq_restore(flags);
782 static int rs_write_room(struct tty_struct *tty)
784 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
787 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
789 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
795 static int rs_chars_in_buffer(struct tty_struct *tty)
797 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
799 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
801 return info->xmit_cnt;
804 static void rs_flush_buffer(struct tty_struct *tty)
806 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
809 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
811 local_irq_save(flags);
812 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
813 local_irq_restore(flags);
818 * ------------------------------------------------------------
821 * This routine is called by the upper-layer tty layer to signal that
822 * incoming characters should be throttled.
823 * ------------------------------------------------------------
825 static void rs_throttle(struct tty_struct * tty)
827 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
829 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
833 info->x_char = STOP_CHAR(tty);
835 /* Turn off RTS line (do this atomic) */
838 static void rs_unthrottle(struct tty_struct * tty)
840 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
842 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
849 info->x_char = START_CHAR(tty);
852 /* Assert RTS line (do this atomic) */
856 * ------------------------------------------------------------
857 * rs_ioctl() and friends
858 * ------------------------------------------------------------
861 static int get_serial_info(struct m68k_serial * info,
862 struct serial_struct * retinfo)
864 struct serial_struct tmp;
868 memset(&tmp, 0, sizeof(tmp));
869 tmp.type = info->type;
870 tmp.line = info->line;
871 tmp.port = info->port;
873 tmp.flags = info->flags;
874 tmp.baud_base = info->baud_base;
875 tmp.close_delay = info->close_delay;
876 tmp.closing_wait = info->closing_wait;
877 tmp.custom_divisor = info->custom_divisor;
878 copy_to_user(retinfo,&tmp,sizeof(*retinfo));
882 static int set_serial_info(struct m68k_serial * info,
883 struct serial_struct * new_info)
885 struct serial_struct new_serial;
886 struct m68k_serial old_info;
891 copy_from_user(&new_serial,new_info,sizeof(new_serial));
894 if (!capable(CAP_SYS_ADMIN)) {
895 if ((new_serial.baud_base != info->baud_base) ||
896 (new_serial.type != info->type) ||
897 (new_serial.close_delay != info->close_delay) ||
898 ((new_serial.flags & ~S_USR_MASK) !=
899 (info->flags & ~S_USR_MASK)))
901 info->flags = ((info->flags & ~S_USR_MASK) |
902 (new_serial.flags & S_USR_MASK));
903 info->custom_divisor = new_serial.custom_divisor;
911 * OK, past this point, all the error checking has been done.
912 * At this point, we start making changes.....
915 info->baud_base = new_serial.baud_base;
916 info->flags = ((info->flags & ~S_FLAGS) |
917 (new_serial.flags & S_FLAGS));
918 info->type = new_serial.type;
919 info->close_delay = new_serial.close_delay;
920 info->closing_wait = new_serial.closing_wait;
923 retval = startup(info);
928 * get_lsr_info - get line status register info
930 * Purpose: Let user call ioctl() to get info when the UART physically
931 * is emptied. On bus types like RS485, the transmitter must
932 * release the bus after transmitting. This must be done when
933 * the transmit shift register is empty, not be done when the
934 * transmit holding register is empty. This functionality
935 * allows an RS485 driver to be written in user space.
937 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
939 #ifdef CONFIG_SERIAL_68328_RTS_CTS
940 m68328_uart *uart = &uart_addr[info->line];
942 unsigned char status;
945 local_irq_save(flags);
946 #ifdef CONFIG_SERIAL_68328_RTS_CTS
947 status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
951 local_irq_restore(flags);
952 put_user(status,value);
957 * This routine sends a break character out the serial port.
959 static void send_break(struct m68k_serial * info, unsigned int duration)
961 m68328_uart *uart = &uart_addr[info->line];
965 local_irq_save(flags);
967 uart->utx.w |= UTX_SEND_BREAK;
968 msleep_interruptible(duration);
969 uart->utx.w &= ~UTX_SEND_BREAK;
971 local_irq_restore(flags);
974 static int rs_ioctl(struct tty_struct *tty, struct file * file,
975 unsigned int cmd, unsigned long arg)
978 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
981 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
984 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
985 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
986 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
987 if (tty->flags & (1 << TTY_IO_ERROR))
992 case TCSBRK: /* SVID version: non-zero arg --> no break */
993 retval = tty_check_change(tty);
996 tty_wait_until_sent(tty, 0);
998 send_break(info, 250); /* 1/4 second */
1000 case TCSBRKP: /* support for POSIX tcsendbreak() */
1001 retval = tty_check_change(tty);
1004 tty_wait_until_sent(tty, 0);
1005 send_break(info, arg ? arg*(100) : 250);
1008 if (access_ok(VERIFY_WRITE, (void *) arg,
1009 sizeof(struct serial_struct)))
1010 return get_serial_info(info,
1011 (struct serial_struct *) arg);
1014 return set_serial_info(info,
1015 (struct serial_struct *) arg);
1016 case TIOCSERGETLSR: /* Get line status register */
1017 if (access_ok(VERIFY_WRITE, (void *) arg,
1018 sizeof(unsigned int)))
1019 return get_lsr_info(info, (unsigned int *) arg);
1021 case TIOCSERGSTRUCT:
1022 if (!access_ok(VERIFY_WRITE, (void *) arg,
1023 sizeof(struct m68k_serial)))
1025 copy_to_user((struct m68k_serial *) arg,
1026 info, sizeof(struct m68k_serial));
1030 return -ENOIOCTLCMD;
1035 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1037 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1041 if ((old_termios->c_cflag & CRTSCTS) &&
1042 !(tty->termios->c_cflag & CRTSCTS)) {
1043 tty->hw_stopped = 0;
1050 * ------------------------------------------------------------
1053 * This routine is called when the serial port gets closed. First, we
1054 * wait for the last remaining data to be sent. Then, we unlink its
1055 * S structure from the interrupt chain if necessary, and we free
1056 * that IRQ if nothing is left in the chain.
1057 * ------------------------------------------------------------
1059 static void rs_close(struct tty_struct *tty, struct file * filp)
1061 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1062 m68328_uart *uart = &uart_addr[info->line];
1063 unsigned long flags;
1065 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1068 local_irq_save(flags);
1070 if (tty_hung_up_p(filp)) {
1071 local_irq_restore(flags);
1075 if ((tty->count == 1) && (info->count != 1)) {
1077 * Uh, oh. tty->count is 1, which means that the tty
1078 * structure will be freed. Info->count should always
1079 * be one in these conditions. If it's greater than
1080 * one, we've got real problems, since it means the
1081 * serial port won't be shutdown.
1083 printk("rs_close: bad serial port count; tty->count is 1, "
1084 "info->count is %d\n", info->count);
1087 if (--info->count < 0) {
1088 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1089 info->line, info->count);
1093 local_irq_restore(flags);
1096 info->flags |= S_CLOSING;
1098 * Now we wait for the transmit buffer to clear; and we notify
1099 * the line discipline to only process XON/XOFF characters.
1102 if (info->closing_wait != S_CLOSING_WAIT_NONE)
1103 tty_wait_until_sent(tty, info->closing_wait);
1105 * At this point we stop accepting input. To do this, we
1106 * disable the receive line status interrupts, and tell the
1107 * interrupt driver to stop checking the data ready bit in the
1108 * line status register.
1111 uart->ustcnt &= ~USTCNT_RXEN;
1112 uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1115 rs_flush_buffer(tty);
1117 tty_ldisc_flush(tty);
1120 info->port.tty = NULL;
1121 #warning "This is not and has never been valid so fix it"
1123 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1124 if (tty->ldisc.close)
1125 (tty->ldisc.close)(tty);
1126 tty->ldisc = ldiscs[N_TTY];
1127 tty->termios->c_line = N_TTY;
1128 if (tty->ldisc.open)
1129 (tty->ldisc.open)(tty);
1132 if (info->blocked_open) {
1133 if (info->close_delay) {
1134 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1136 wake_up_interruptible(&info->open_wait);
1138 info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1139 wake_up_interruptible(&info->close_wait);
1140 local_irq_restore(flags);
1144 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1146 void rs_hangup(struct tty_struct *tty)
1148 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1150 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1153 rs_flush_buffer(tty);
1157 info->flags &= ~S_NORMAL_ACTIVE;
1158 info->port.tty = NULL;
1159 wake_up_interruptible(&info->open_wait);
1163 * ------------------------------------------------------------
1164 * rs_open() and friends
1165 * ------------------------------------------------------------
1167 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1168 struct m68k_serial *info)
1170 DECLARE_WAITQUEUE(wait, current);
1175 * If the device is in the middle of being closed, then block
1176 * until it's done, and then try again.
1178 if (info->flags & S_CLOSING) {
1179 interruptible_sleep_on(&info->close_wait);
1180 #ifdef SERIAL_DO_RESTART
1181 if (info->flags & S_HUP_NOTIFY)
1184 return -ERESTARTSYS;
1191 * If non-blocking mode is set, or the port is not enabled,
1192 * then make the check up front and then exit.
1194 if ((filp->f_flags & O_NONBLOCK) ||
1195 (tty->flags & (1 << TTY_IO_ERROR))) {
1196 info->flags |= S_NORMAL_ACTIVE;
1200 if (tty->termios->c_cflag & CLOCAL)
1204 * Block waiting for the carrier detect and the line to become
1205 * free (i.e., not in use by the callout). While we are in
1206 * this loop, info->count is dropped by one, so that
1207 * rs_close() knows when to free things. We restore it upon
1208 * exit, either normal or abnormal.
1211 add_wait_queue(&info->open_wait, &wait);
1214 info->blocked_open++;
1216 local_irq_disable();
1217 m68k_rtsdtr(info, 1);
1219 current->state = TASK_INTERRUPTIBLE;
1220 if (tty_hung_up_p(filp) ||
1221 !(info->flags & S_INITIALIZED)) {
1222 #ifdef SERIAL_DO_RESTART
1223 if (info->flags & S_HUP_NOTIFY)
1226 retval = -ERESTARTSYS;
1232 if (!(info->flags & S_CLOSING) && do_clocal)
1234 if (signal_pending(current)) {
1235 retval = -ERESTARTSYS;
1242 current->state = TASK_RUNNING;
1243 remove_wait_queue(&info->open_wait, &wait);
1244 if (!tty_hung_up_p(filp))
1246 info->blocked_open--;
1250 info->flags |= S_NORMAL_ACTIVE;
1255 * This routine is called whenever a serial port is opened. It
1256 * enables interrupts for a serial port, linking in its S structure into
1257 * the IRQ chain. It also performs the serial-specific
1258 * initialization for the tty structure.
1260 int rs_open(struct tty_struct *tty, struct file * filp)
1262 struct m68k_serial *info;
1267 if (line >= NR_PORTS || line < 0) /* we have exactly one */
1270 info = &m68k_soft[line];
1272 if (serial_paranoia_check(info, tty->name, "rs_open"))
1276 tty->driver_data = info;
1277 info->port.tty = tty;
1280 * Start up serial port
1282 retval = startup(info);
1286 return block_til_ready(tty, filp, info);
1289 /* Finally, routines used to initialize the serial driver. */
1291 static void show_serial_version(void)
1293 printk("MC68328 serial driver version 1.00\n");
1296 static const struct tty_operations rs_ops = {
1300 .flush_chars = rs_flush_chars,
1301 .write_room = rs_write_room,
1302 .chars_in_buffer = rs_chars_in_buffer,
1303 .flush_buffer = rs_flush_buffer,
1305 .throttle = rs_throttle,
1306 .unthrottle = rs_unthrottle,
1307 .set_termios = rs_set_termios,
1310 .hangup = rs_hangup,
1311 .set_ldisc = rs_set_ldisc,
1314 /* rs_init inits the driver */
1319 struct m68k_serial *info;
1321 serial_driver = alloc_tty_driver(NR_PORTS);
1325 show_serial_version();
1327 /* Initialize the tty_driver structure */
1328 /* SPARC: Not all of this is exactly right for us. */
1330 serial_driver->name = "ttyS";
1331 serial_driver->major = TTY_MAJOR;
1332 serial_driver->minor_start = 64;
1333 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1334 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1335 serial_driver->init_termios = tty_std_termios;
1336 serial_driver->init_termios.c_cflag =
1337 m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1338 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1339 tty_set_operations(serial_driver, &rs_ops);
1341 if (tty_register_driver(serial_driver)) {
1342 put_tty_driver(serial_driver);
1343 printk(KERN_ERR "Couldn't register serial driver\n");
1347 local_irq_save(flags);
1349 for(i=0;i<NR_PORTS;i++) {
1351 info = &m68k_soft[i];
1352 info->magic = SERIAL_MAGIC;
1353 info->port = (int) &uart_addr[i];
1354 info->port.tty = NULL;
1355 info->irq = uart_irqs[i];
1356 info->custom_divisor = 16;
1357 info->close_delay = 50;
1358 info->closing_wait = 3000;
1362 info->blocked_open = 0;
1363 INIT_WORK(&info->tqueue, do_softint);
1364 INIT_WORK(&info->tqueue_hangup, do_serial_hangup);
1365 init_waitqueue_head(&info->open_wait);
1366 init_waitqueue_head(&info->close_wait);
1368 info->is_cons = 1; /* Means shortcuts work */
1370 printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1371 info->port, info->irq);
1372 printk(" is a builtin MC68328 UART\n");
1374 #ifdef CONFIG_M68VZ328
1376 PJSEL &= 0xCF; /* PSW enable second port output */
1379 if (request_irq(uart_irqs[i],
1382 "M68328_UART", info))
1383 panic("Unable to attach 68328 serial interrupt\n");
1385 local_irq_restore(flags);
1389 module_init(rs68328_init);
1393 static void m68328_set_baud(void)
1395 unsigned short ustcnt;
1399 USTCNT = ustcnt & ~USTCNT_TXEN;
1402 for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1403 if (baud_table[i] == m68328_console_baud)
1405 if (i >= ARRAY_SIZE(baud_table)) {
1406 m68328_console_baud = 9600;
1410 UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
1411 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1412 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1413 ustcnt |= USTCNT_8_7;
1414 ustcnt |= USTCNT_TXEN;
1416 m68328_console_initted = 1;
1421 int m68328_console_setup(struct console *cp, char *arg)
1423 int i, n = CONSOLE_BAUD_RATE;
1429 n = simple_strtoul(arg,NULL,0);
1431 for (i = 0; i < ARRAY_SIZE(baud_table); i++)
1432 if (baud_table[i] == n)
1434 if (i < ARRAY_SIZE(baud_table)) {
1435 m68328_console_baud = n;
1436 m68328_console_cbaud = 0;
1438 m68328_console_cbaud |= CBAUDEX;
1441 m68328_console_cbaud |= i;
1444 m68328_set_baud(); /* make sure baud rate changes */
1449 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1452 return serial_driver;
1456 void m68328_console_write (struct console *co, const char *str,
1459 if (!m68328_console_initted)
1464 rs_put_char( *str++ );
1469 static struct console m68328_driver = {
1471 .write = m68328_console_write,
1472 .device = m68328_console_device,
1473 .setup = m68328_console_setup,
1474 .flags = CON_PRINTBUFFER,
1479 static int __init m68328_console_init(void)
1481 register_console(&m68328_driver);
1485 console_initcall(m68328_console_init);