1 /* 68328serial.c: Serial port driver for 68328 microcontroller
3 * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
4 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
5 * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
6 * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
7 * Copyright (C) 2002-2003 David McCullough <davidm@snapgear.com>
8 * Copyright (C) 2002 Greg Ungerer <gerg@snapgear.com>
10 * VZ Support/Fixes Evan Stawnyczy <e@lineo.ca>
11 * Multiple UART support Daniel Potts <danielp@cse.unsw.edu.au>
12 * Power management support Daniel Potts <danielp@cse.unsw.edu.au>
13 * VZ Second Serial Port enable Phil Wilshire
14 * 2.4/2.5 port David McCullough
18 #include <linux/module.h>
19 #include <linux/errno.h>
20 #include <linux/signal.h>
21 #include <linux/sched.h>
22 #include <linux/timer.h>
23 #include <linux/interrupt.h>
24 #include <linux/tty.h>
25 #include <linux/tty_flip.h>
26 #include <linux/config.h>
27 #include <linux/major.h>
28 #include <linux/string.h>
29 #include <linux/fcntl.h>
31 #include <linux/kernel.h>
32 #include <linux/console.h>
33 #include <linux/reboot.h>
34 #include <linux/keyboard.h>
35 #include <linux/init.h>
37 #include <linux/pm_legacy.h>
38 #include <linux/bitops.h>
39 #include <linux/delay.h>
43 #include <asm/system.h>
44 #include <asm/delay.h>
45 #include <asm/uaccess.h>
48 /* note: perhaps we can murge these files, so that you can just
49 * define 1 of them, and they can sort that out for themselves
51 #if defined(CONFIG_M68EZ328)
52 #include <asm/MC68EZ328.h>
54 #if defined(CONFIG_M68VZ328)
55 #include <asm/MC68VZ328.h>
57 #include <asm/MC68328.h>
58 #endif /* CONFIG_M68VZ328 */
59 #endif /* CONFIG_M68EZ328 */
61 #include "68328serial.h"
63 /* Turn off usage of real serial interrupt code, to "support" Copilot */
64 #ifdef CONFIG_XCOPILOT_BUGS
70 static struct m68k_serial m68k_soft[NR_PORTS];
71 struct m68k_serial *IRQ_ports[NR_IRQS];
73 static unsigned int uart_irqs[NR_PORTS] = UART_IRQ_DEFNS;
75 /* multiple ports are contiguous in memory */
76 m68328_uart *uart_addr = (m68328_uart *)USTCNT_ADDR;
78 struct tty_struct m68k_ttys;
79 struct m68k_serial *m68k_consinfo = 0;
81 #define M68K_CLOCK (16667000) /* FIXME: 16MHz is likely wrong */
84 extern wait_queue_head_t keypress_wait;
87 struct tty_driver *serial_driver;
89 /* serial subtype definitions */
90 #define SERIAL_TYPE_NORMAL 1
92 /* number of characters left in xmit buffer before we ask for more */
93 #define WAKEUP_CHARS 256
95 /* Debugging... DEBUG_INTR is bad to use when one of the zs
96 * lines is your console ;(
98 #undef SERIAL_DEBUG_INTR
99 #undef SERIAL_DEBUG_OPEN
100 #undef SERIAL_DEBUG_FLOW
102 #define RS_ISR_PASS_LIMIT 256
104 static void change_speed(struct m68k_serial *info);
107 * Setup for console. Argument comes from the boot command line.
110 #if defined(CONFIG_M68EZ328ADS) || defined(CONFIG_ALMA_ANS) || defined(CONFIG_DRAGONIXVZ)
111 #define CONSOLE_BAUD_RATE 115200
112 #define DEFAULT_CBAUD B115200
115 /* note: this is messy, but it works, again, perhaps defined somewhere else?*/
116 #ifdef CONFIG_M68VZ328
117 #define CONSOLE_BAUD_RATE 19200
118 #define DEFAULT_CBAUD B19200
123 #ifndef CONSOLE_BAUD_RATE
124 #define CONSOLE_BAUD_RATE 9600
125 #define DEFAULT_CBAUD B9600
129 static int m68328_console_initted = 0;
130 static int m68328_console_baud = CONSOLE_BAUD_RATE;
131 static int m68328_console_cbaud = DEFAULT_CBAUD;
134 static inline int serial_paranoia_check(struct m68k_serial *info,
135 char *name, const char *routine)
137 #ifdef SERIAL_PARANOIA_CHECK
138 static const char *badmagic =
139 "Warning: bad magic number for serial struct %s in %s\n";
140 static const char *badinfo =
141 "Warning: null m68k_serial for %s in %s\n";
144 printk(badinfo, name, routine);
147 if (info->magic != SERIAL_MAGIC) {
148 printk(badmagic, name, routine);
156 * This is used to figure out the divisor speeds and the timeouts
158 static int baud_table[] = {
159 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
160 9600, 19200, 38400, 57600, 115200, 0 };
162 #define BAUD_TABLE_SIZE (sizeof(baud_table)/sizeof(baud_table[0]))
164 /* Sets or clears DTR/RTS on the requested line */
165 static inline void m68k_rtsdtr(struct m68k_serial *ss, int set)
168 /* set the RTS/CTS line */
175 /* Utility routines */
176 static inline int get_baud(struct m68k_serial *ss)
178 unsigned long result = 115200;
179 unsigned short int baud = uart_addr[ss->line].ubaud;
180 if (GET_FIELD(baud, UBAUD_PRESCALER) == 0x38) result = 38400;
181 result >>= GET_FIELD(baud, UBAUD_DIVIDE);
187 * ------------------------------------------------------------
188 * rs_stop() and rs_start()
190 * This routines are called before setting or resetting tty->stopped.
191 * They enable or disable transmitter interrupts, as necessary.
192 * ------------------------------------------------------------
194 static void rs_stop(struct tty_struct *tty)
196 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
197 m68328_uart *uart = &uart_addr[info->line];
200 if (serial_paranoia_check(info, tty->name, "rs_stop"))
203 local_irq_save(flags);
204 uart->ustcnt &= ~USTCNT_TXEN;
205 local_irq_restore(flags);
208 static void rs_put_char(char ch)
210 int flags, loops = 0;
212 local_irq_save(flags);
214 while (!(UTX & UTX_TX_AVAIL) && (loops < 1000)) {
221 local_irq_restore(flags);
224 static void rs_start(struct tty_struct *tty)
226 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
227 m68328_uart *uart = &uart_addr[info->line];
230 if (serial_paranoia_check(info, tty->name, "rs_start"))
233 local_irq_save(flags);
234 if (info->xmit_cnt && info->xmit_buf && !(uart->ustcnt & USTCNT_TXEN)) {
236 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
238 uart->ustcnt |= USTCNT_TXEN;
241 local_irq_restore(flags);
244 /* Drop into either the boot monitor or kadb upon receiving a break
245 * from keyboard/console input.
247 static void batten_down_hatches(void)
249 /* Drop into the debugger */
252 static void status_handle(struct m68k_serial *info, unsigned short status)
256 if((info->tty->termios->c_cflag & CRTSCTS) &&
257 ((info->curregs[3] & AUTO_ENAB)==0)) {
258 info->curregs[3] |= AUTO_ENAB;
259 info->pendregs[3] |= AUTO_ENAB;
260 write_zsreg(info->m68k_channel, 3, info->curregs[3]);
263 if((info->curregs[3] & AUTO_ENAB)) {
264 info->curregs[3] &= ~AUTO_ENAB;
265 info->pendregs[3] &= ~AUTO_ENAB;
266 write_zsreg(info->m68k_channel, 3, info->curregs[3]);
270 /* If this is console input and this is a
271 * 'break asserted' status change interrupt
272 * see if we can drop into the debugger
274 if((status & URX_BREAK) && info->break_abort)
275 batten_down_hatches();
279 static void receive_chars(struct m68k_serial *info, struct pt_regs *regs,
282 struct tty_struct *tty = info->tty;
283 m68328_uart *uart = &uart_addr[info->line];
284 unsigned char ch, flag;
287 * This do { } while() loop will get ALL chars out of Rx FIFO
289 #ifndef CONFIG_XCOPILOT_BUGS
292 ch = GET_FIELD(rx, URX_RXDATA);
295 if(URX_BREAK & rx) { /* whee, break received */
296 status_handle(info, rx);
298 #ifdef CONFIG_MAGIC_SYSRQ
299 } else if (ch == 0x10) { /* ^P */
303 /* show_net_buffers(); */
305 } else if (ch == 0x12) { /* ^R */
308 #endif /* CONFIG_MAGIC_SYSRQ */
310 /* It is a 'keyboard interrupt' ;-) */
311 #ifdef CONFIG_CONSOLE
312 wake_up(&keypress_wait);
321 if(rx & URX_PARITY_ERROR) {
323 status_handle(info, rx);
324 } else if(rx & URX_OVRUN) {
326 status_handle(info, rx);
327 } else if(rx & URX_FRAME_ERROR) {
329 status_handle(info, rx);
331 tty_insert_flip_char(tty, ch, flag);
332 #ifndef CONFIG_XCOPILOT_BUGS
333 } while((rx = uart->urx.w) & URX_DATA_READY);
336 tty_schedule_flip(tty);
342 static void transmit_chars(struct m68k_serial *info)
344 m68328_uart *uart = &uart_addr[info->line];
348 uart->utx.b.txdata = info->x_char;
350 goto clear_and_return;
353 if((info->xmit_cnt <= 0) || info->tty->stopped) {
354 /* That's peculiar... TX ints off */
355 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
356 goto clear_and_return;
360 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
361 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
364 if (info->xmit_cnt < WAKEUP_CHARS)
365 schedule_work(&info->tqueue);
367 if(info->xmit_cnt <= 0) {
368 /* All done for now... TX ints off */
369 uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
370 goto clear_and_return;
374 /* Clear interrupt (should be auto)*/
379 * This is the serial driver's generic interrupt routine
381 irqreturn_t rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
383 struct m68k_serial * info;
388 info = IRQ_ports[irq];
392 uart = &uart_addr[info->line];
398 if (rx & URX_DATA_READY) receive_chars(info, regs, rx);
399 if (tx & UTX_TX_AVAIL) transmit_chars(info);
401 receive_chars(info, regs, rx);
406 static void do_softint(void *private)
408 struct m68k_serial *info = (struct m68k_serial *) private;
409 struct tty_struct *tty;
415 if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
422 * This routine is called from the scheduler tqueue when the interrupt
423 * routine has signalled that a hangup has occurred. The path of
424 * hangup processing is:
426 * serial interrupt routine -> (scheduler tqueue) ->
427 * do_serial_hangup() -> tty->hangup() -> rs_hangup()
430 static void do_serial_hangup(void *private)
432 struct m68k_serial *info = (struct m68k_serial *) private;
433 struct tty_struct *tty;
443 static int startup(struct m68k_serial * info)
445 m68328_uart *uart = &uart_addr[info->line];
448 if (info->flags & S_INITIALIZED)
451 if (!info->xmit_buf) {
452 info->xmit_buf = (unsigned char *) __get_free_page(GFP_KERNEL);
457 local_irq_save(flags);
460 * Clear the FIFO buffers and disable them
461 * (they will be reenabled in change_speed())
464 uart->ustcnt = USTCNT_UEN;
465 info->xmit_fifo_size = 1;
466 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_TXEN;
470 * Finally, enable sequencing and interrupts
473 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN |
474 USTCNT_RX_INTR_MASK | USTCNT_TX_INTR_MASK;
476 uart->ustcnt = USTCNT_UEN | USTCNT_RXEN | USTCNT_RX_INTR_MASK;
480 clear_bit(TTY_IO_ERROR, &info->tty->flags);
481 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
484 * and set the speed of the serial port
489 info->flags |= S_INITIALIZED;
490 local_irq_restore(flags);
495 * This routine will shutdown a serial port; interrupts are disabled, and
496 * DTR is dropped if the hangup on close termio flag is on.
498 static void shutdown(struct m68k_serial * info)
500 m68328_uart *uart = &uart_addr[info->line];
503 uart->ustcnt = 0; /* All off! */
504 if (!(info->flags & S_INITIALIZED))
507 local_irq_save(flags);
509 if (info->xmit_buf) {
510 free_page((unsigned long) info->xmit_buf);
515 set_bit(TTY_IO_ERROR, &info->tty->flags);
517 info->flags &= ~S_INITIALIZED;
518 local_irq_restore(flags);
522 int divisor, prescale;
524 #ifndef CONFIG_M68VZ328
525 hw_baud_table[18] = {
540 {1,0x26}, /* 19200 */
541 {0,0x26}, /* 38400 */
542 {1,0x38}, /* 57600 */
543 {0,0x38}, /* 115200 */
546 hw_baud_table[18] = {
561 {2,0x26}, /* 19200 */
562 {1,0x26}, /* 38400 */
563 {0,0x26}, /* 57600 */
564 {1,0x38}, /* 115200 */
567 /* rate = 1036800 / ((65 - prescale) * (1<<divider)) */
570 * This routine is called to set the UART divisor registers to match
571 * the specified baud rate for a serial port.
573 static void change_speed(struct m68k_serial *info)
575 m68328_uart *uart = &uart_addr[info->line];
577 unsigned short ustcnt;
581 if (!info->tty || !info->tty->termios)
583 cflag = info->tty->termios->c_cflag;
584 if (!(port = info->port))
587 ustcnt = uart->ustcnt;
588 uart->ustcnt = ustcnt & ~USTCNT_TXEN;
592 i = (i & ~CBAUDEX) + B38400;
595 info->baud = baud_table[i];
596 uart->ubaud = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
597 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
599 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
601 if ((cflag & CSIZE) == CS8)
602 ustcnt |= USTCNT_8_7;
605 ustcnt |= USTCNT_STOP;
608 ustcnt |= USTCNT_PARITYEN;
610 ustcnt |= USTCNT_ODD_EVEN;
612 #ifdef CONFIG_SERIAL_68328_RTS_CTS
613 if (cflag & CRTSCTS) {
614 uart->utx.w &= ~ UTX_NOCTS;
616 uart->utx.w |= UTX_NOCTS;
620 ustcnt |= USTCNT_TXEN;
622 uart->ustcnt = ustcnt;
627 * Fair output driver allows a process to speak.
629 static void rs_fair_output(void)
631 int left; /* Output no more than that */
633 struct m68k_serial *info = &m68k_soft[0];
636 if (info == 0) return;
637 if (info->xmit_buf == 0) return;
639 local_irq_save(flags);
640 left = info->xmit_cnt;
642 c = info->xmit_buf[info->xmit_tail];
643 info->xmit_tail = (info->xmit_tail+1) & (SERIAL_XMIT_SIZE-1);
645 local_irq_restore(flags);
649 local_irq_save(flags);
650 left = min(info->xmit_cnt, left-1);
653 /* Last character is being transmitted now (hopefully). */
656 local_irq_restore(flags);
661 * m68k_console_print is registered for printk.
663 void console_print_68328(const char *p)
667 while((c=*(p++)) != 0) {
673 /* Comment this if you want to have a strict interrupt-driven output */
679 static void rs_set_ldisc(struct tty_struct *tty)
681 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
683 if (serial_paranoia_check(info, tty->name, "rs_set_ldisc"))
686 info->is_cons = (tty->termios->c_line == N_TTY);
688 printk("ttyS%d console mode %s\n", info->line, info->is_cons ? "on" : "off");
691 static void rs_flush_chars(struct tty_struct *tty)
693 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
694 m68328_uart *uart = &uart_addr[info->line];
697 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
703 /* Enable transmitter */
704 local_irq_save(flags);
706 if (info->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
708 local_irq_restore(flags);
713 uart->ustcnt |= USTCNT_TXEN | USTCNT_TX_INTR_MASK;
715 uart->ustcnt |= USTCNT_TXEN;
719 if (uart->utx.w & UTX_TX_AVAIL) {
724 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
725 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
730 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
733 local_irq_restore(flags);
736 extern void console_printn(const char * b, int count);
738 static int rs_write(struct tty_struct * tty,
739 const unsigned char *buf, int count)
742 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
743 m68328_uart *uart = &uart_addr[info->line];
746 if (serial_paranoia_check(info, tty->name, "rs_write"))
749 if (!tty || !info->xmit_buf)
752 local_save_flags(flags);
755 c = min_t(int, count, min(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
756 SERIAL_XMIT_SIZE - info->xmit_head));
757 local_irq_restore(flags);
762 memcpy(info->xmit_buf + info->xmit_head, buf, c);
765 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
767 local_irq_restore(flags);
773 if (info->xmit_cnt && !tty->stopped && !tty->hw_stopped) {
774 /* Enable transmitter */
777 while(info->xmit_cnt) {
780 uart->ustcnt |= USTCNT_TXEN;
782 uart->ustcnt |= USTCNT_TX_INTR_MASK;
784 while (!(uart->utx.w & UTX_TX_AVAIL)) udelay(5);
786 if (uart->utx.w & UTX_TX_AVAIL) {
787 uart->utx.b.txdata = info->xmit_buf[info->xmit_tail++];
788 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
795 local_irq_restore(flags);
801 static int rs_write_room(struct tty_struct *tty)
803 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
806 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
808 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
814 static int rs_chars_in_buffer(struct tty_struct *tty)
816 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
818 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
820 return info->xmit_cnt;
823 static void rs_flush_buffer(struct tty_struct *tty)
825 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
828 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
830 local_irq_save(flags);
831 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
832 local_irq_restore(flags);
837 * ------------------------------------------------------------
840 * This routine is called by the upper-layer tty layer to signal that
841 * incoming characters should be throttled.
842 * ------------------------------------------------------------
844 static void rs_throttle(struct tty_struct * tty)
846 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
848 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
852 info->x_char = STOP_CHAR(tty);
854 /* Turn off RTS line (do this atomic) */
857 static void rs_unthrottle(struct tty_struct * tty)
859 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
861 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
868 info->x_char = START_CHAR(tty);
871 /* Assert RTS line (do this atomic) */
875 * ------------------------------------------------------------
876 * rs_ioctl() and friends
877 * ------------------------------------------------------------
880 static int get_serial_info(struct m68k_serial * info,
881 struct serial_struct * retinfo)
883 struct serial_struct tmp;
887 memset(&tmp, 0, sizeof(tmp));
888 tmp.type = info->type;
889 tmp.line = info->line;
890 tmp.port = info->port;
892 tmp.flags = info->flags;
893 tmp.baud_base = info->baud_base;
894 tmp.close_delay = info->close_delay;
895 tmp.closing_wait = info->closing_wait;
896 tmp.custom_divisor = info->custom_divisor;
897 copy_to_user(retinfo,&tmp,sizeof(*retinfo));
901 static int set_serial_info(struct m68k_serial * info,
902 struct serial_struct * new_info)
904 struct serial_struct new_serial;
905 struct m68k_serial old_info;
910 copy_from_user(&new_serial,new_info,sizeof(new_serial));
913 if (!capable(CAP_SYS_ADMIN)) {
914 if ((new_serial.baud_base != info->baud_base) ||
915 (new_serial.type != info->type) ||
916 (new_serial.close_delay != info->close_delay) ||
917 ((new_serial.flags & ~S_USR_MASK) !=
918 (info->flags & ~S_USR_MASK)))
920 info->flags = ((info->flags & ~S_USR_MASK) |
921 (new_serial.flags & S_USR_MASK));
922 info->custom_divisor = new_serial.custom_divisor;
930 * OK, past this point, all the error checking has been done.
931 * At this point, we start making changes.....
934 info->baud_base = new_serial.baud_base;
935 info->flags = ((info->flags & ~S_FLAGS) |
936 (new_serial.flags & S_FLAGS));
937 info->type = new_serial.type;
938 info->close_delay = new_serial.close_delay;
939 info->closing_wait = new_serial.closing_wait;
942 retval = startup(info);
947 * get_lsr_info - get line status register info
949 * Purpose: Let user call ioctl() to get info when the UART physically
950 * is emptied. On bus types like RS485, the transmitter must
951 * release the bus after transmitting. This must be done when
952 * the transmit shift register is empty, not be done when the
953 * transmit holding register is empty. This functionality
954 * allows an RS485 driver to be written in user space.
956 static int get_lsr_info(struct m68k_serial * info, unsigned int *value)
958 #ifdef CONFIG_SERIAL_68328_RTS_CTS
959 m68328_uart *uart = &uart_addr[info->line];
961 unsigned char status;
964 local_irq_save(flags);
965 #ifdef CONFIG_SERIAL_68328_RTS_CTS
966 status = (uart->utx.w & UTX_CTS_STAT) ? 1 : 0;
970 local_irq_restore(flags);
971 put_user(status,value);
976 * This routine sends a break character out the serial port.
978 static void send_break(struct m68k_serial * info, unsigned int duration)
980 m68328_uart *uart = &uart_addr[info->line];
984 local_irq_save(flags);
986 uart->utx.w |= UTX_SEND_BREAK;
987 msleep_interruptible(duration);
988 uart->utx.w &= ~UTX_SEND_BREAK;
990 local_irq_restore(flags);
993 static int rs_ioctl(struct tty_struct *tty, struct file * file,
994 unsigned int cmd, unsigned long arg)
997 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1000 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1003 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1004 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1005 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
1006 if (tty->flags & (1 << TTY_IO_ERROR))
1011 case TCSBRK: /* SVID version: non-zero arg --> no break */
1012 retval = tty_check_change(tty);
1015 tty_wait_until_sent(tty, 0);
1017 send_break(info, 250); /* 1/4 second */
1019 case TCSBRKP: /* support for POSIX tcsendbreak() */
1020 retval = tty_check_change(tty);
1023 tty_wait_until_sent(tty, 0);
1024 send_break(info, arg ? arg*(100) : 250);
1027 error = put_user(C_CLOCAL(tty) ? 1 : 0,
1028 (unsigned long *) arg);
1033 get_user(arg, (unsigned long *) arg);
1034 tty->termios->c_cflag =
1035 ((tty->termios->c_cflag & ~CLOCAL) |
1036 (arg ? CLOCAL : 0));
1039 if (access_ok(VERIFY_WRITE, (void *) arg,
1040 sizeof(struct serial_struct)))
1041 return get_serial_info(info,
1042 (struct serial_struct *) arg);
1045 return set_serial_info(info,
1046 (struct serial_struct *) arg);
1047 case TIOCSERGETLSR: /* Get line status register */
1048 if (access_ok(VERIFY_WRITE, (void *) arg,
1049 sizeof(unsigned int)))
1050 return get_lsr_info(info, (unsigned int *) arg);
1052 case TIOCSERGSTRUCT:
1053 if (!access_ok(VERIFY_WRITE, (void *) arg,
1054 sizeof(struct m68k_serial)))
1056 copy_to_user((struct m68k_serial *) arg,
1057 info, sizeof(struct m68k_serial));
1061 return -ENOIOCTLCMD;
1066 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1068 struct m68k_serial *info = (struct m68k_serial *)tty->driver_data;
1070 if (tty->termios->c_cflag == old_termios->c_cflag)
1075 if ((old_termios->c_cflag & CRTSCTS) &&
1076 !(tty->termios->c_cflag & CRTSCTS)) {
1077 tty->hw_stopped = 0;
1084 * ------------------------------------------------------------
1087 * This routine is called when the serial port gets closed. First, we
1088 * wait for the last remaining data to be sent. Then, we unlink its
1089 * S structure from the interrupt chain if necessary, and we free
1090 * that IRQ if nothing is left in the chain.
1091 * ------------------------------------------------------------
1093 static void rs_close(struct tty_struct *tty, struct file * filp)
1095 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1096 m68328_uart *uart = &uart_addr[info->line];
1097 unsigned long flags;
1099 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1102 local_irq_save(flags);
1104 if (tty_hung_up_p(filp)) {
1105 local_irq_restore(flags);
1109 if ((tty->count == 1) && (info->count != 1)) {
1111 * Uh, oh. tty->count is 1, which means that the tty
1112 * structure will be freed. Info->count should always
1113 * be one in these conditions. If it's greater than
1114 * one, we've got real problems, since it means the
1115 * serial port won't be shutdown.
1117 printk("rs_close: bad serial port count; tty->count is 1, "
1118 "info->count is %d\n", info->count);
1121 if (--info->count < 0) {
1122 printk("rs_close: bad serial port count for ttyS%d: %d\n",
1123 info->line, info->count);
1127 local_irq_restore(flags);
1130 info->flags |= S_CLOSING;
1132 * Now we wait for the transmit buffer to clear; and we notify
1133 * the line discipline to only process XON/XOFF characters.
1136 if (info->closing_wait != S_CLOSING_WAIT_NONE)
1137 tty_wait_until_sent(tty, info->closing_wait);
1139 * At this point we stop accepting input. To do this, we
1140 * disable the receive line status interrupts, and tell the
1141 * interrupt driver to stop checking the data ready bit in the
1142 * line status register.
1145 uart->ustcnt &= ~USTCNT_RXEN;
1146 uart->ustcnt &= ~(USTCNT_RXEN | USTCNT_RX_INTR_MASK);
1149 if (tty->driver->flush_buffer)
1150 tty->driver->flush_buffer(tty);
1152 tty_ldisc_flush(tty);
1156 #warning "This is not and has never been valid so fix it"
1158 if (tty->ldisc.num != ldiscs[N_TTY].num) {
1159 if (tty->ldisc.close)
1160 (tty->ldisc.close)(tty);
1161 tty->ldisc = ldiscs[N_TTY];
1162 tty->termios->c_line = N_TTY;
1163 if (tty->ldisc.open)
1164 (tty->ldisc.open)(tty);
1167 if (info->blocked_open) {
1168 if (info->close_delay) {
1169 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1171 wake_up_interruptible(&info->open_wait);
1173 info->flags &= ~(S_NORMAL_ACTIVE|S_CLOSING);
1174 wake_up_interruptible(&info->close_wait);
1175 local_irq_restore(flags);
1179 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1181 void rs_hangup(struct tty_struct *tty)
1183 struct m68k_serial * info = (struct m68k_serial *)tty->driver_data;
1185 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1188 rs_flush_buffer(tty);
1192 info->flags &= ~S_NORMAL_ACTIVE;
1194 wake_up_interruptible(&info->open_wait);
1198 * ------------------------------------------------------------
1199 * rs_open() and friends
1200 * ------------------------------------------------------------
1202 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1203 struct m68k_serial *info)
1205 DECLARE_WAITQUEUE(wait, current);
1210 * If the device is in the middle of being closed, then block
1211 * until it's done, and then try again.
1213 if (info->flags & S_CLOSING) {
1214 interruptible_sleep_on(&info->close_wait);
1215 #ifdef SERIAL_DO_RESTART
1216 if (info->flags & S_HUP_NOTIFY)
1219 return -ERESTARTSYS;
1226 * If non-blocking mode is set, or the port is not enabled,
1227 * then make the check up front and then exit.
1229 if ((filp->f_flags & O_NONBLOCK) ||
1230 (tty->flags & (1 << TTY_IO_ERROR))) {
1231 info->flags |= S_NORMAL_ACTIVE;
1235 if (tty->termios->c_cflag & CLOCAL)
1239 * Block waiting for the carrier detect and the line to become
1240 * free (i.e., not in use by the callout). While we are in
1241 * this loop, info->count is dropped by one, so that
1242 * rs_close() knows when to free things. We restore it upon
1243 * exit, either normal or abnormal.
1246 add_wait_queue(&info->open_wait, &wait);
1249 info->blocked_open++;
1251 local_irq_disable();
1252 m68k_rtsdtr(info, 1);
1254 current->state = TASK_INTERRUPTIBLE;
1255 if (tty_hung_up_p(filp) ||
1256 !(info->flags & S_INITIALIZED)) {
1257 #ifdef SERIAL_DO_RESTART
1258 if (info->flags & S_HUP_NOTIFY)
1261 retval = -ERESTARTSYS;
1267 if (!(info->flags & S_CLOSING) && do_clocal)
1269 if (signal_pending(current)) {
1270 retval = -ERESTARTSYS;
1275 current->state = TASK_RUNNING;
1276 remove_wait_queue(&info->open_wait, &wait);
1277 if (!tty_hung_up_p(filp))
1279 info->blocked_open--;
1283 info->flags |= S_NORMAL_ACTIVE;
1288 * This routine is called whenever a serial port is opened. It
1289 * enables interrupts for a serial port, linking in its S structure into
1290 * the IRQ chain. It also performs the serial-specific
1291 * initialization for the tty structure.
1293 int rs_open(struct tty_struct *tty, struct file * filp)
1295 struct m68k_serial *info;
1300 if (line >= NR_PORTS || line < 0) /* we have exactly one */
1303 info = &m68k_soft[line];
1305 if (serial_paranoia_check(info, tty->name, "rs_open"))
1309 tty->driver_data = info;
1313 * Start up serial port
1315 retval = startup(info);
1319 return block_til_ready(tty, filp, info);
1322 /* Finally, routines used to initialize the serial driver. */
1324 static void show_serial_version(void)
1326 printk("MC68328 serial driver version 1.00\n");
1329 #ifdef CONFIG_PM_LEGACY
1330 /* Serial Power management
1331 * The console (currently fixed at line 0) is a special case for power
1332 * management because the kernel is so chatty. The console will be
1333 * explicitly disabled my our power manager as the last minute, so we won't
1334 * mess with it here.
1336 static struct pm_dev *serial_pm[NR_PORTS];
1338 static int serial_pm_callback(struct pm_dev *dev, pm_request_t request, void *data)
1340 struct m68k_serial *info = (struct m68k_serial *)dev->data;
1345 /* special case for line 0 - pm restores it */
1361 void shutdown_console(void)
1363 struct m68k_serial *info = &m68k_soft[0];
1365 /* HACK: wait a bit for any pending printk's to be dumped */
1374 void startup_console(void)
1376 struct m68k_serial *info = &m68k_soft[0];
1379 #endif /* CONFIG_PM_LEGACY */
1382 static struct tty_operations rs_ops = {
1386 .flush_chars = rs_flush_chars,
1387 .write_room = rs_write_room,
1388 .chars_in_buffer = rs_chars_in_buffer,
1389 .flush_buffer = rs_flush_buffer,
1391 .throttle = rs_throttle,
1392 .unthrottle = rs_unthrottle,
1393 .set_termios = rs_set_termios,
1396 .hangup = rs_hangup,
1397 .set_ldisc = rs_set_ldisc,
1400 /* rs_init inits the driver */
1405 struct m68k_serial *info;
1407 serial_driver = alloc_tty_driver(NR_PORTS);
1411 show_serial_version();
1413 /* Initialize the tty_driver structure */
1414 /* SPARC: Not all of this is exactly right for us. */
1416 serial_driver->name = "ttyS";
1417 serial_driver->major = TTY_MAJOR;
1418 serial_driver->minor_start = 64;
1419 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1420 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1421 serial_driver->init_termios = tty_std_termios;
1422 serial_driver->init_termios.c_cflag =
1423 m68328_console_cbaud | CS8 | CREAD | HUPCL | CLOCAL;
1424 serial_driver->flags = TTY_DRIVER_REAL_RAW;
1425 tty_set_operations(serial_driver, &rs_ops);
1427 if (tty_register_driver(serial_driver)) {
1428 put_tty_driver(serial_driver);
1429 printk(KERN_ERR "Couldn't register serial driver\n");
1433 local_irq_save(flags);
1435 for(i=0;i<NR_PORTS;i++) {
1437 info = &m68k_soft[i];
1438 info->magic = SERIAL_MAGIC;
1439 info->port = (int) &uart_addr[i];
1441 info->irq = uart_irqs[i];
1442 info->custom_divisor = 16;
1443 info->close_delay = 50;
1444 info->closing_wait = 3000;
1448 info->blocked_open = 0;
1449 INIT_WORK(&info->tqueue, do_softint, info);
1450 INIT_WORK(&info->tqueue_hangup, do_serial_hangup, info);
1451 init_waitqueue_head(&info->open_wait);
1452 init_waitqueue_head(&info->close_wait);
1454 info->is_cons = 1; /* Means shortcuts work */
1456 printk("%s%d at 0x%08x (irq = %d)", serial_driver->name, info->line,
1457 info->port, info->irq);
1458 printk(" is a builtin MC68328 UART\n");
1460 IRQ_ports[info->irq] = info; /* waste of space */
1462 #ifdef CONFIG_M68VZ328
1464 PJSEL &= 0xCF; /* PSW enable second port output */
1467 if (request_irq(uart_irqs[i],
1470 "M68328_UART", NULL))
1471 panic("Unable to attach 68328 serial interrupt\n");
1472 #ifdef CONFIG_PM_LEGACY
1473 serial_pm[i] = pm_register(PM_SYS_DEV, PM_SYS_COM, serial_pm_callback);
1475 serial_pm[i]->data = info;
1478 local_irq_restore(flags);
1482 module_init(rs68328_init);
1486 static void m68328_set_baud(void)
1488 unsigned short ustcnt;
1492 USTCNT = ustcnt & ~USTCNT_TXEN;
1495 for (i = 0; i < sizeof(baud_table) / sizeof(baud_table[0]); i++)
1496 if (baud_table[i] == m68328_console_baud)
1498 if (i >= sizeof(baud_table) / sizeof(baud_table[0])) {
1499 m68328_console_baud = 9600;
1503 UBAUD = PUT_FIELD(UBAUD_DIVIDE, hw_baud_table[i].divisor) |
1504 PUT_FIELD(UBAUD_PRESCALER, hw_baud_table[i].prescale);
1505 ustcnt &= ~(USTCNT_PARITYEN | USTCNT_ODD_EVEN | USTCNT_STOP | USTCNT_8_7);
1506 ustcnt |= USTCNT_8_7;
1507 ustcnt |= USTCNT_TXEN;
1509 m68328_console_initted = 1;
1514 int m68328_console_setup(struct console *cp, char *arg)
1516 int i, n = CONSOLE_BAUD_RATE;
1522 n = simple_strtoul(arg,NULL,0);
1524 for (i = 0; i < BAUD_TABLE_SIZE; i++)
1525 if (baud_table[i] == n)
1527 if (i < BAUD_TABLE_SIZE) {
1528 m68328_console_baud = n;
1529 m68328_console_cbaud = 0;
1531 m68328_console_cbaud |= CBAUDEX;
1534 m68328_console_cbaud |= i;
1537 m68328_set_baud(); /* make sure baud rate changes */
1542 static struct tty_driver *m68328_console_device(struct console *c, int *index)
1545 return serial_driver;
1549 void m68328_console_write (struct console *co, const char *str,
1552 if (!m68328_console_initted)
1557 rs_put_char( *str++ );
1562 static struct console m68328_driver = {
1564 .write = m68328_console_write,
1565 .device = m68328_console_device,
1566 .setup = m68328_console_setup,
1567 .flags = CON_PRINTBUFFER,
1572 static int __init m68328_console_init(void)
1574 register_console(&m68328_driver);
1578 console_initcall(m68328_console_init);