2 * decserial.c: Serial port driver for IOASIC DECstations.
4 * Derived from drivers/sbus/char/sunserial.c by Paul Mackerras.
5 * Derived from drivers/macintosh/macserial.c by Harald Koerfgen.
8 * Copyright (C) 1998-2000 Harald Koerfgen
9 * Copyright (C) 2000, 2001, 2002 Maciej W. Rozycki <macro@ds2.pg.gda.pl>
11 * For the rest of the code the original Copyright applies:
12 * Copyright (C) 1996 Paul Mackerras (Paul.Mackerras@cs.anu.edu.au)
13 * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
16 * Note: for IOASIC systems the wiring is as follows:
19 * DIN-7 MJ-4 signal SCC
24 * DB-25 MMJ-6 signal SCC
31 * 12 DSRS(DCE) -> ~A.CTS (*)
36 * 23 DSRS(DTE) <- ~B.RTS
38 * (*) EIA-232 defines the signal at this pin to be SCD, while DSRS(DCE)
39 * is shared with DSRS(DTE) at pin 23.
42 #include <linux/config.h>
43 #include <linux/version.h>
44 #include <linux/errno.h>
45 #include <linux/signal.h>
46 #include <linux/sched.h>
47 #include <linux/timer.h>
48 #include <linux/interrupt.h>
49 #include <linux/tty.h>
50 #include <linux/tty_flip.h>
51 #include <linux/major.h>
52 #include <linux/string.h>
53 #include <linux/fcntl.h>
55 #include <linux/kernel.h>
56 #include <linux/delay.h>
57 #include <linux/init.h>
58 #include <linux/ioport.h>
59 #ifdef CONFIG_SERIAL_CONSOLE
60 #include <linux/console.h>
64 #include <asm/pgtable.h>
66 #include <asm/system.h>
67 #include <asm/segment.h>
68 #include <asm/bitops.h>
69 #include <asm/uaccess.h>
70 #include <asm/bootinfo.h>
71 #ifdef CONFIG_DECSTATION
72 #include <asm/dec/interrupts.h>
73 #include <asm/dec/machtype.h>
74 #include <asm/dec/tc.h>
75 #include <asm/dec/ioasic_addrs.h>
77 #ifdef CONFIG_BAGET_MIPS
78 #include <asm/baget/baget.h>
79 unsigned long system_base;
84 #ifdef CONFIG_MAGIC_SYSRQ
85 #include <linux/sysrq.h>
91 * It would be nice to dynamically allocate everything that
92 * depends on NUM_SERIAL, so we could support any number of
93 * Z8530s, but for now...
95 #define NUM_SERIAL 2 /* Max number of ZS chips supported */
96 #define NUM_CHANNELS (NUM_SERIAL * 2) /* 2 channels per chip */
97 #define CHANNEL_A_NR (zs_parms->channel_a_offset > zs_parms->channel_b_offset)
98 /* Number of channel A in the chip */
99 #define ZS_CHAN_IO_SIZE 8
100 #define ZS_CLOCK 7372800 /* Z8530 RTxC input clock rate */
102 #define RECOVERY_DELAY udelay(2)
107 int channel_a_offset;
108 int channel_b_offset;
114 static struct zs_parms *zs_parms;
116 #ifdef CONFIG_DECSTATION
117 static struct zs_parms ds_parms = {
120 channel_a_offset : 1,
121 channel_b_offset : 9,
127 #ifdef CONFIG_BAGET_MIPS
128 static struct zs_parms baget_parms = {
131 channel_a_offset : 9,
132 channel_b_offset : 1,
133 irq0 : BAGET_SCC_IRQ,
134 irq1 : BAGET_SCC_IRQ,
139 #ifdef CONFIG_DECSTATION
140 #define DS_BUS_PRESENT (IOASIC)
142 #define DS_BUS_PRESENT 0
145 #ifdef CONFIG_BAGET_MIPS
146 #define BAGET_BUS_PRESENT (mips_machtype == MACH_BAGET202)
148 #define BAGET_BUS_PRESENT 0
151 #define BUS_PRESENT (DS_BUS_PRESENT || BAGET_BUS_PRESENT)
153 struct dec_zschannel zs_channels[NUM_CHANNELS];
154 struct dec_serial zs_soft[NUM_CHANNELS];
155 int zs_channels_found;
156 struct dec_serial *zs_chain; /* list of all channels */
158 struct tty_struct zs_ttys[NUM_CHANNELS];
160 #ifdef CONFIG_SERIAL_CONSOLE
161 static struct console sercons;
163 #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) \
165 static unsigned long break_pressed; /* break, really ... */
168 static unsigned char zs_init_regs[16] __initdata = {
173 (X16CLK | SB1), /* write 4 */
175 0, 0, 0, /* write 6, 7, 8 */
177 (NRZ), /* write 10 */
178 (TCBR | RCBR), /* write 11 */
179 0, 0, /* BRG time constant, write 12 + 13 */
180 (BRSRC | BRENABL), /* write 14 */
184 DECLARE_TASK_QUEUE(tq_zs_serial);
186 struct tty_driver serial_driver, callout_driver;
187 static int serial_refcount;
189 /* serial subtype definitions */
190 #define SERIAL_TYPE_NORMAL 1
191 #define SERIAL_TYPE_CALLOUT 2
193 /* number of characters left in xmit buffer before we ask for more */
194 #define WAKEUP_CHARS 256
199 #undef SERIAL_DEBUG_INTR
200 #undef SERIAL_DEBUG_OPEN
201 #undef SERIAL_DEBUG_FLOW
202 #undef SERIAL_DEBUG_THROTTLE
203 #undef SERIAL_PARANOIA_CHECK
207 #ifdef SERIAL_DEBUG_THROTTLE
208 #define _tty_name(tty,buf) tty_name(tty,buf)
211 #define RS_STROBE_TIME 10
212 #define RS_ISR_PASS_LIMIT 256
214 #define _INLINE_ inline
216 static void probe_sccs(void);
217 static void change_speed(struct dec_serial *info);
218 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
220 static struct tty_struct *serial_table[NUM_CHANNELS];
221 static struct termios *serial_termios[NUM_CHANNELS];
222 static struct termios *serial_termios_locked[NUM_CHANNELS];
225 #define MIN(a,b) ((a) < (b) ? (a) : (b))
229 * tmp_buf is used as a temporary buffer by serial_write. We need to
230 * lock it in case the copy_from_user blocks while swapping in a page,
231 * and some other program tries to do a serial write at the same time.
232 * Since the lock will only come under contention when the system is
233 * swapping and available memory is low, it makes sense to share one
234 * buffer across all the serial ports, since it significantly saves
235 * memory if large numbers of serial ports are open.
237 static unsigned char tmp_buf[4096]; /* This is cheating */
238 static DECLARE_MUTEX(tmp_buf_sem);
240 static inline int serial_paranoia_check(struct dec_serial *info,
241 dev_t device, const char *routine)
243 #ifdef SERIAL_PARANOIA_CHECK
244 static const char *badmagic =
245 "Warning: bad magic number for serial struct (%d, %d) in %s\n";
246 static const char *badinfo =
247 "Warning: null mac_serial for (%d, %d) in %s\n";
250 printk(badinfo, MAJOR(device), MINOR(device), routine);
253 if (info->magic != SERIAL_MAGIC) {
254 printk(badmagic, MAJOR(device), MINOR(device), routine);
262 * This is used to figure out the divisor speeds and the timeouts
264 static int baud_table[] = {
265 0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
266 9600, 19200, 38400, 57600, 115200, 0 };
269 * Reading and writing Z8530 registers.
271 static inline unsigned char read_zsreg(struct dec_zschannel *channel,
274 unsigned char retval;
277 *channel->control = reg & 0xf;
278 fast_iob(); RECOVERY_DELAY;
280 retval = *channel->control;
285 static inline void write_zsreg(struct dec_zschannel *channel,
286 unsigned char reg, unsigned char value)
289 *channel->control = reg & 0xf;
290 fast_iob(); RECOVERY_DELAY;
292 *channel->control = value;
293 fast_iob(); RECOVERY_DELAY;
297 static inline unsigned char read_zsdata(struct dec_zschannel *channel)
299 unsigned char retval;
301 retval = *channel->data;
306 static inline void write_zsdata(struct dec_zschannel *channel,
309 *channel->data = value;
310 fast_iob(); RECOVERY_DELAY;
314 static inline void load_zsregs(struct dec_zschannel *channel,
317 /* ZS_CLEARERR(channel);
318 ZS_CLEARFIFO(channel); */
320 write_zsreg(channel, R4, regs[R4]);
321 write_zsreg(channel, R3, regs[R3] & ~RxENABLE);
322 write_zsreg(channel, R5, regs[R5] & ~TxENAB);
323 write_zsreg(channel, R9, regs[R9]);
324 write_zsreg(channel, R1, regs[R1]);
325 write_zsreg(channel, R2, regs[R2]);
326 write_zsreg(channel, R10, regs[R10]);
327 write_zsreg(channel, R11, regs[R11]);
328 write_zsreg(channel, R12, regs[R12]);
329 write_zsreg(channel, R13, regs[R13]);
330 write_zsreg(channel, R14, regs[R14]);
331 write_zsreg(channel, R15, regs[R15]);
332 write_zsreg(channel, R3, regs[R3]);
333 write_zsreg(channel, R5, regs[R5]);
337 /* Sets or clears DTR/RTS on the requested line */
338 static inline void zs_rtsdtr(struct dec_serial *info, int which, int set)
343 save_flags(flags); cli();
344 if (info->zs_channel != info->zs_chan_a) {
346 info->zs_chan_a->curregs[5] |= (which & (RTS | DTR));
348 info->zs_chan_a->curregs[5] &= ~(which & (RTS | DTR));
350 write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]);
352 restore_flags(flags);
355 /* Utility routines for the Zilog */
356 static inline int get_zsbaud(struct dec_serial *ss)
358 struct dec_zschannel *channel = ss->zs_channel;
361 /* The baud rate is split up between two 8-bit registers in
362 * what is termed 'BRG time constant' format in my docs for
363 * the chip, it is a function of the clk rate the chip is
364 * receiving which happens to be constant.
366 brg = (read_zsreg(channel, 13) << 8);
367 brg |= read_zsreg(channel, 12);
368 return BRG_TO_BPS(brg, (zs_parms->clock/(ss->clk_divisor)));
371 /* On receive, this clears errors and the receiver interrupts */
372 static inline void rs_recv_clear(struct dec_zschannel *zsc)
374 write_zsreg(zsc, 0, ERR_RES);
375 write_zsreg(zsc, 0, RES_H_IUS); /* XXX this is unnecessary */
379 * ----------------------------------------------------------------------
381 * Here starts the interrupt handling routines. All of the following
382 * subroutines are declared as inline and are folded into
383 * rs_interrupt(). They were separated out for readability's sake.
385 * - Ted Ts'o (tytso@mit.edu), 7-Mar-93
386 * -----------------------------------------------------------------------
389 static int tty_break; /* Set whenever BREAK condition is detected. */
392 * This routine is used by the interrupt handler to schedule
393 * processing in the software interrupt portion of the driver.
395 static _INLINE_ void rs_sched_event(struct dec_serial *info,
398 info->event |= 1 << event;
399 queue_task(&info->tqueue, &tq_zs_serial);
403 static _INLINE_ void receive_chars(struct dec_serial *info,
404 struct pt_regs *regs)
406 struct tty_struct *tty = info->tty;
407 unsigned char ch, stat, flag;
409 while ((read_zsreg(info->zs_channel, R0) & Rx_CH_AV) != 0) {
411 stat = read_zsreg(info->zs_channel, R1);
412 ch = read_zsdata(info->zs_channel);
414 if (!tty && (!info->hook || !info->hook->rx_char))
419 #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && !defined(MODULE)
420 if (info->line == sercons.index) {
421 if (!break_pressed) {
422 break_pressed = jiffies;
429 if (info->flags & ZILOG_SAK)
434 } else if (stat & FRM_ERR) {
436 } else if (stat & PAR_ERR) {
441 /* reset the error indication */
442 write_zsreg(info->zs_channel, R0, ERR_RES);
445 #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && !defined(MODULE)
446 if (break_pressed && info->line == sercons.index) {
448 time_before(jiffies, break_pressed + HZ*5)) {
449 handle_sysrq(ch, regs, NULL, NULL);
457 if (info->hook && info->hook->rx_char) {
458 (*info->hook->rx_char)(ch, flag);
462 if (tty->flip.count >= TTY_FLIPBUF_SIZE) {
463 static int flip_buf_ovf;
469 static int flip_max_cnt;
470 if (flip_max_cnt < tty->flip.count)
471 flip_max_cnt = tty->flip.count;
474 *tty->flip.flag_buf_ptr++ = flag;
475 *tty->flip.char_buf_ptr++ = ch;
476 #if defined(CONFIG_SERIAL_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) && !defined(MODULE)
481 tty_flip_buffer_push(tty);
484 static void transmit_chars(struct dec_serial *info)
486 if ((read_zsreg(info->zs_channel, R0) & Tx_BUF_EMP) == 0)
492 write_zsdata(info->zs_channel, info->x_char);
498 if ((info->xmit_cnt <= 0) || (info->tty && info->tty->stopped)
499 || info->tx_stopped) {
500 write_zsreg(info->zs_channel, R0, RES_Tx_P);
504 write_zsdata(info->zs_channel, info->xmit_buf[info->xmit_tail++]);
505 info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
509 if (info->xmit_cnt < WAKEUP_CHARS)
510 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
513 static _INLINE_ void status_handle(struct dec_serial *info)
517 /* Get status from Read Register 0 */
518 stat = read_zsreg(info->zs_channel, R0);
520 if (stat & BRK_ABRT) {
521 #ifdef SERIAL_DEBUG_INTR
522 printk("handling break....");
527 if (info->zs_channel != info->zs_chan_a) {
529 /* Check for DCD transitions */
530 if (info->tty && !C_CLOCAL(info->tty) &&
531 ((stat ^ info->read_reg_zero) & DCD) != 0 ) {
533 wake_up_interruptible(&info->open_wait);
534 } else if (!(info->flags & ZILOG_CALLOUT_ACTIVE)) {
535 tty_hangup(info->tty);
539 /* Check for CTS transitions */
540 if (info->tty && C_CRTSCTS(info->tty)) {
541 if ((stat & CTS) != 0) {
542 if (info->tx_stopped) {
543 info->tx_stopped = 0;
544 if (!info->tx_active)
545 transmit_chars(info);
548 info->tx_stopped = 1;
554 /* Clear status condition... */
555 write_zsreg(info->zs_channel, R0, RES_EXT_INT);
556 info->read_reg_zero = stat;
560 * This is the serial driver's generic interrupt routine
562 void rs_interrupt(int irq, void *dev_id, struct pt_regs * regs)
564 struct dec_serial *info = (struct dec_serial *) dev_id;
565 unsigned char zs_intreg;
568 /* NOTE: The read register 3, which holds the irq status,
569 * does so for both channels on each chip. Although
570 * the status value itself must be read from the A
571 * channel and is only valid when read from channel A.
572 * Yes... broken hardware...
574 #define CHAN_IRQMASK (CHBRxIP | CHBTxIP | CHBEXT)
576 if (info->zs_chan_a == info->zs_channel)
577 shift = 3; /* Channel A */
579 shift = 0; /* Channel B */
582 zs_intreg = read_zsreg(info->zs_chan_a, R3) >> shift;
583 if ((zs_intreg & CHAN_IRQMASK) == 0)
586 if (zs_intreg & CHBRxIP) {
587 receive_chars(info, regs);
589 if (zs_intreg & CHBTxIP) {
590 transmit_chars(info);
592 if (zs_intreg & CHBEXT) {
597 /* Why do we need this ? */
598 write_zsreg(info->zs_channel, 0, RES_H_IUS);
602 void zs_dump (void) {
604 for (i = 0; i < zs_channels_found; i++) {
605 struct dec_zschannel *ch = &zs_channels[i];
606 if ((long)ch->control == UNI_IO_BASE+UNI_SCC1A_CTRL) {
607 for (j = 0; j < 15; j++) {
608 printk("W%d = 0x%x\t",
609 j, (int)ch->curregs[j]);
611 for (j = 0; j < 15; j++) {
612 printk("R%d = 0x%x\t",
613 j, (int)read_zsreg(ch,j));
622 * -------------------------------------------------------------------
623 * Here ends the serial interrupt routines.
624 * -------------------------------------------------------------------
628 * ------------------------------------------------------------
629 * rs_stop() and rs_start()
631 * This routines are called before setting or resetting tty->stopped.
632 * ------------------------------------------------------------
634 static void rs_stop(struct tty_struct *tty)
636 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
639 if (serial_paranoia_check(info, tty->device, "rs_stop"))
643 save_flags(flags); cli();
644 if (info->zs_channel->curregs[5] & TxENAB) {
645 info->zs_channel->curregs[5] &= ~TxENAB;
646 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
648 restore_flags(flags);
652 static void rs_start(struct tty_struct *tty)
654 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
657 if (serial_paranoia_check(info, tty->device, "rs_start"))
660 save_flags(flags); cli();
662 if (info->xmit_cnt && info->xmit_buf && !(info->zs_channel->curregs[5] & TxENAB)) {
663 info->zs_channel->curregs[5] |= TxENAB;
664 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
667 if (info->xmit_cnt && info->xmit_buf && !info->tx_active) {
668 transmit_chars(info);
671 restore_flags(flags);
675 * This routine is used to handle the "bottom half" processing for the
676 * serial driver, known also the "software interrupt" processing.
677 * This processing is done at the kernel interrupt level, after the
678 * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON. This
679 * is where time-consuming activities which can not be done in the
680 * interrupt driver proper are done; the interrupt driver schedules
681 * them using rs_sched_event(), and they get done here.
683 static void do_serial_bh(void)
685 run_task_queue(&tq_zs_serial);
688 static void do_softint(void *private_)
690 struct dec_serial *info = (struct dec_serial *) private_;
691 struct tty_struct *tty;
697 if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
698 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
699 tty->ldisc.write_wakeup)
700 (tty->ldisc.write_wakeup)(tty);
701 wake_up_interruptible(&tty->write_wait);
705 int zs_startup(struct dec_serial * info)
709 if (info->flags & ZILOG_INITIALIZED)
712 if (!info->xmit_buf) {
713 info->xmit_buf = (unsigned char *) get_free_page(GFP_KERNEL);
718 save_flags(flags); cli();
720 #ifdef SERIAL_DEBUG_OPEN
721 printk("starting up ttyS%02d (irq %d)...", info->line, info->irq);
725 * Clear the receive FIFO.
727 ZS_CLEARFIFO(info->zs_channel);
728 info->xmit_fifo_size = 1;
731 * Clear the interrupt registers.
733 write_zsreg(info->zs_channel, 0, ERR_RES);
734 write_zsreg(info->zs_channel, 0, RES_H_IUS);
737 * Turn on RTS and DTR.
739 zs_rtsdtr(info, RTS | DTR, 1);
742 * Finally, enable sequencing and interrupts
744 info->zs_channel->curregs[1] = (info->zs_channel->curregs[1] & ~0x18) | (EXT_INT_ENAB | INT_ALL_Rx | TxINT_ENAB);
745 info->zs_channel->curregs[3] |= (RxENABLE | Rx8);
746 info->zs_channel->curregs[5] |= (TxENAB | Tx8);
747 info->zs_channel->curregs[15] |= (DCDIE | CTSIE | TxUIE | BRKIE);
748 info->zs_channel->curregs[9] |= (VIS | MIE);
749 write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]);
750 write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
751 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
752 write_zsreg(info->zs_channel, 15, info->zs_channel->curregs[15]);
753 write_zsreg(info->zs_channel, 9, info->zs_channel->curregs[9]);
756 * And clear the interrupt registers again for luck.
758 write_zsreg(info->zs_channel, 0, ERR_RES);
759 write_zsreg(info->zs_channel, 0, RES_H_IUS);
762 clear_bit(TTY_IO_ERROR, &info->tty->flags);
763 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
766 * Set the speed of the serial port
770 /* Save the current value of RR0 */
771 info->read_reg_zero = read_zsreg(info->zs_channel, 0);
773 info->flags |= ZILOG_INITIALIZED;
774 restore_flags(flags);
779 * This routine will shutdown a serial port; interrupts are disabled, and
780 * DTR is dropped if the hangup on close termio flag is on.
782 static void shutdown(struct dec_serial * info)
786 if (!(info->flags & ZILOG_INITIALIZED))
789 #ifdef SERIAL_DEBUG_OPEN
790 printk("Shutting down serial port %d (irq %d)....", info->line,
794 save_flags(flags); cli(); /* Disable interrupts */
796 if (info->xmit_buf) {
797 free_page((unsigned long) info->xmit_buf);
801 info->zs_channel->curregs[1] = 0;
802 write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]); /* no interrupts */
804 info->zs_channel->curregs[3] &= ~RxENABLE;
805 write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
807 info->zs_channel->curregs[5] &= ~TxENAB;
808 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
809 if (!info->tty || C_HUPCL(info->tty)) {
810 zs_rtsdtr(info, RTS | DTR, 0);
814 set_bit(TTY_IO_ERROR, &info->tty->flags);
816 info->flags &= ~ZILOG_INITIALIZED;
817 restore_flags(flags);
821 * This routine is called to set the UART divisor registers to match
822 * the specified baud rate for a serial port.
824 static void change_speed(struct dec_serial *info)
832 if (!info->tty || !info->tty->termios)
834 cflag = info->tty->termios->c_cflag;
838 cflag = info->hook->cflags;
844 if (i < 1 || i > 2) {
846 info->tty->termios->c_cflag &= ~CBAUDEX;
848 info->hook->cflags &= ~CBAUDEX;
853 save_flags(flags); cli();
854 info->zs_baud = baud_table[i];
855 info->clk_divisor = 16;
857 info->zs_channel->curregs[4] = X16CLK;
858 brg = BPS_TO_BRG(info->zs_baud, zs_parms->clock/info->clk_divisor);
859 info->zs_channel->curregs[12] = (brg & 255);
860 info->zs_channel->curregs[13] = ((brg >> 8) & 255);
861 zs_rtsdtr(info, DTR, 1);
863 zs_rtsdtr(info, RTS | DTR, 0);
867 /* byte size and parity */
868 info->zs_channel->curregs[3] &= ~RxNBITS_MASK;
869 info->zs_channel->curregs[5] &= ~TxNBITS_MASK;
870 switch (cflag & CSIZE) {
873 info->zs_channel->curregs[3] |= Rx5;
874 info->zs_channel->curregs[5] |= Tx5;
878 info->zs_channel->curregs[3] |= Rx6;
879 info->zs_channel->curregs[5] |= Tx6;
883 info->zs_channel->curregs[3] |= Rx7;
884 info->zs_channel->curregs[5] |= Tx7;
887 default: /* defaults to 8 bits */
889 info->zs_channel->curregs[3] |= Rx8;
890 info->zs_channel->curregs[5] |= Tx8;
894 info->timeout = ((info->xmit_fifo_size*HZ*bits) / info->zs_baud);
895 info->timeout += HZ/50; /* Add .02 seconds of slop */
897 info->zs_channel->curregs[4] &= ~(SB_MASK | PAR_ENA | PAR_EVEN);
898 if (cflag & CSTOPB) {
899 info->zs_channel->curregs[4] |= SB2;
901 info->zs_channel->curregs[4] |= SB1;
903 if (cflag & PARENB) {
904 info->zs_channel->curregs[4] |= PAR_ENA;
906 if (!(cflag & PARODD)) {
907 info->zs_channel->curregs[4] |= PAR_EVEN;
910 if (!(cflag & CLOCAL)) {
911 if (!(info->zs_channel->curregs[15] & DCDIE))
912 info->read_reg_zero = read_zsreg(info->zs_channel, 0);
913 info->zs_channel->curregs[15] |= DCDIE;
915 info->zs_channel->curregs[15] &= ~DCDIE;
916 if (cflag & CRTSCTS) {
917 info->zs_channel->curregs[15] |= CTSIE;
918 if ((read_zsreg(info->zs_channel, 0) & CTS) == 0)
919 info->tx_stopped = 1;
921 info->zs_channel->curregs[15] &= ~CTSIE;
922 info->tx_stopped = 0;
925 /* Load up the new values */
926 load_zsregs(info->zs_channel, info->zs_channel->curregs);
928 restore_flags(flags);
931 static void rs_flush_chars(struct tty_struct *tty)
933 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
936 if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
939 if (info->xmit_cnt <= 0 || tty->stopped || info->tx_stopped ||
943 /* Enable transmitter */
944 save_flags(flags); cli();
945 transmit_chars(info);
946 restore_flags(flags);
949 static int rs_write(struct tty_struct * tty, int from_user,
950 const unsigned char *buf, int count)
953 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
956 if (serial_paranoia_check(info, tty->device, "rs_write"))
959 if (!tty || !info->xmit_buf)
965 c = MIN(count, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
966 SERIAL_XMIT_SIZE - info->xmit_head));
972 copy_from_user(tmp_buf, buf, c);
973 c = MIN(c, MIN(SERIAL_XMIT_SIZE - info->xmit_cnt - 1,
974 SERIAL_XMIT_SIZE - info->xmit_head));
975 memcpy(info->xmit_buf + info->xmit_head, tmp_buf, c);
978 memcpy(info->xmit_buf + info->xmit_head, buf, c);
979 info->xmit_head = (info->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
981 restore_flags(flags);
987 if (info->xmit_cnt && !tty->stopped && !info->tx_stopped
989 transmit_chars(info);
990 restore_flags(flags);
994 static int rs_write_room(struct tty_struct *tty)
996 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
999 if (serial_paranoia_check(info, tty->device, "rs_write_room"))
1001 ret = SERIAL_XMIT_SIZE - info->xmit_cnt - 1;
1007 static int rs_chars_in_buffer(struct tty_struct *tty)
1009 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
1011 if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
1013 return info->xmit_cnt;
1016 static void rs_flush_buffer(struct tty_struct *tty)
1018 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
1020 if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
1023 info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
1025 wake_up_interruptible(&tty->write_wait);
1026 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
1027 tty->ldisc.write_wakeup)
1028 (tty->ldisc.write_wakeup)(tty);
1032 * ------------------------------------------------------------
1035 * This routine is called by the upper-layer tty layer to signal that
1036 * incoming characters should be throttled.
1037 * ------------------------------------------------------------
1039 static void rs_throttle(struct tty_struct * tty)
1041 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
1042 unsigned long flags;
1044 #ifdef SERIAL_DEBUG_THROTTLE
1047 printk("throttle %s: %d....\n", _tty_name(tty, buf),
1048 tty->ldisc.chars_in_buffer(tty));
1051 if (serial_paranoia_check(info, tty->device, "rs_throttle"))
1055 save_flags(flags); cli();
1056 info->x_char = STOP_CHAR(tty);
1057 if (!info->tx_active)
1058 transmit_chars(info);
1059 restore_flags(flags);
1062 if (C_CRTSCTS(tty)) {
1063 zs_rtsdtr(info, RTS, 0);
1067 static void rs_unthrottle(struct tty_struct * tty)
1069 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
1070 unsigned long flags;
1072 #ifdef SERIAL_DEBUG_THROTTLE
1075 printk("unthrottle %s: %d....\n", _tty_name(tty, buf),
1076 tty->ldisc.chars_in_buffer(tty));
1079 if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
1083 save_flags(flags); cli();
1087 info->x_char = START_CHAR(tty);
1088 if (!info->tx_active)
1089 transmit_chars(info);
1091 restore_flags(flags);
1094 if (C_CRTSCTS(tty)) {
1095 zs_rtsdtr(info, RTS, 1);
1100 * ------------------------------------------------------------
1101 * rs_ioctl() and friends
1102 * ------------------------------------------------------------
1105 static int get_serial_info(struct dec_serial * info,
1106 struct serial_struct * retinfo)
1108 struct serial_struct tmp;
1112 memset(&tmp, 0, sizeof(tmp));
1113 tmp.type = info->type;
1114 tmp.line = info->line;
1115 tmp.port = info->port;
1116 tmp.irq = info->irq;
1117 tmp.flags = info->flags;
1118 tmp.baud_base = info->baud_base;
1119 tmp.close_delay = info->close_delay;
1120 tmp.closing_wait = info->closing_wait;
1121 tmp.custom_divisor = info->custom_divisor;
1122 return copy_to_user(retinfo,&tmp,sizeof(*retinfo));
1125 static int set_serial_info(struct dec_serial * info,
1126 struct serial_struct * new_info)
1128 struct serial_struct new_serial;
1129 struct dec_serial old_info;
1134 copy_from_user(&new_serial,new_info,sizeof(new_serial));
1137 if (!capable(CAP_SYS_ADMIN)) {
1138 if ((new_serial.baud_base != info->baud_base) ||
1139 (new_serial.type != info->type) ||
1140 (new_serial.close_delay != info->close_delay) ||
1141 ((new_serial.flags & ~ZILOG_USR_MASK) !=
1142 (info->flags & ~ZILOG_USR_MASK)))
1144 info->flags = ((info->flags & ~ZILOG_USR_MASK) |
1145 (new_serial.flags & ZILOG_USR_MASK));
1146 info->custom_divisor = new_serial.custom_divisor;
1147 goto check_and_exit;
1150 if (info->count > 1)
1154 * OK, past this point, all the error checking has been done.
1155 * At this point, we start making changes.....
1158 info->baud_base = new_serial.baud_base;
1159 info->flags = ((info->flags & ~ZILOG_FLAGS) |
1160 (new_serial.flags & ZILOG_FLAGS));
1161 info->type = new_serial.type;
1162 info->close_delay = new_serial.close_delay;
1163 info->closing_wait = new_serial.closing_wait;
1166 retval = zs_startup(info);
1171 * get_lsr_info - get line status register info
1173 * Purpose: Let user call ioctl() to get info when the UART physically
1174 * is emptied. On bus types like RS485, the transmitter must
1175 * release the bus after transmitting. This must be done when
1176 * the transmit shift register is empty, not be done when the
1177 * transmit holding register is empty. This functionality
1178 * allows an RS485 driver to be written in user space.
1180 static int get_lsr_info(struct dec_serial * info, unsigned int *value)
1182 unsigned char status;
1185 status = read_zsreg(info->zs_channel, 0);
1187 put_user(status,value);
1191 static int get_modem_info(struct dec_serial *info, unsigned int *value)
1193 unsigned char control, status_a, status_b;
1194 unsigned int result;
1196 if (info->zs_channel == info->zs_chan_a)
1200 control = info->zs_chan_a->curregs[5];
1201 status_a = read_zsreg(info->zs_chan_a, 0);
1202 status_b = read_zsreg(info->zs_channel, 0);
1204 result = ((control & RTS) ? TIOCM_RTS: 0)
1205 | ((control & DTR) ? TIOCM_DTR: 0)
1206 | ((status_b & DCD) ? TIOCM_CAR: 0)
1207 | ((status_a & DCD) ? TIOCM_RNG: 0)
1208 | ((status_a & SYNC_HUNT) ? TIOCM_DSR: 0)
1209 | ((status_b & CTS) ? TIOCM_CTS: 0);
1211 put_user(result, value);
1215 static int set_modem_info(struct dec_serial *info, unsigned int cmd,
1216 unsigned int *value)
1219 unsigned int arg, bits;
1221 error = verify_area(VERIFY_READ, value, sizeof(int));
1225 if (info->zs_channel == info->zs_chan_a)
1228 get_user(arg, value);
1229 bits = (arg & TIOCM_RTS? RTS: 0) + (arg & TIOCM_DTR? DTR: 0);
1233 info->zs_chan_a->curregs[5] |= bits;
1236 info->zs_chan_a->curregs[5] &= ~bits;
1239 info->zs_chan_a->curregs[5] =
1240 (info->zs_chan_a->curregs[5] & ~(DTR | RTS)) | bits;
1246 write_zsreg(info->zs_chan_a, 5, info->zs_chan_a->curregs[5]);
1252 * rs_break - turn transmit break condition on/off
1254 static void rs_break(struct tty_struct *tty, int break_state)
1256 struct dec_serial *info = (struct dec_serial *) tty->driver_data;
1257 unsigned long flags;
1259 if (serial_paranoia_check(info, tty->device, "rs_break"))
1264 save_flags(flags); cli();
1265 if (break_state == -1)
1266 info->zs_channel->curregs[5] |= SND_BRK;
1268 info->zs_channel->curregs[5] &= ~SND_BRK;
1269 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
1270 restore_flags(flags);
1273 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1274 unsigned int cmd, unsigned long arg)
1277 struct dec_serial * info = (struct dec_serial *)tty->driver_data;
1282 if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
1285 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1286 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGWILD) &&
1287 (cmd != TIOCSERSWILD) && (cmd != TIOCSERGSTRUCT)) {
1288 if (tty->flags & (1 << TTY_IO_ERROR))
1294 error = verify_area(VERIFY_WRITE, (void *) arg,
1295 sizeof(unsigned int));
1298 return get_modem_info(info, (unsigned int *) arg);
1302 return set_modem_info(info, cmd, (unsigned int *) arg);
1304 error = verify_area(VERIFY_WRITE, (void *) arg,
1305 sizeof(struct serial_struct));
1308 return get_serial_info(info,
1309 (struct serial_struct *) arg);
1311 return set_serial_info(info,
1312 (struct serial_struct *) arg);
1313 case TIOCSERGETLSR: /* Get line status register */
1314 error = verify_area(VERIFY_WRITE, (void *) arg,
1315 sizeof(unsigned int));
1319 return get_lsr_info(info, (unsigned int *) arg);
1321 case TIOCSERGSTRUCT:
1322 error = verify_area(VERIFY_WRITE, (void *) arg,
1323 sizeof(struct dec_serial));
1326 copy_from_user((struct dec_serial *) arg,
1327 info, sizeof(struct dec_serial));
1331 return -ENOIOCTLCMD;
1336 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1338 struct dec_serial *info = (struct dec_serial *)tty->driver_data;
1341 if (tty->termios->c_cflag == old_termios->c_cflag)
1343 was_stopped = info->tx_stopped;
1347 if (was_stopped && !info->tx_stopped)
1352 * ------------------------------------------------------------
1355 * This routine is called when the serial port gets closed.
1356 * Wait for the last remaining data to be sent.
1357 * ------------------------------------------------------------
1359 static void rs_close(struct tty_struct *tty, struct file * filp)
1361 struct dec_serial * info = (struct dec_serial *)tty->driver_data;
1362 unsigned long flags;
1364 if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
1367 save_flags(flags); cli();
1369 if (tty_hung_up_p(filp)) {
1370 restore_flags(flags);
1374 #ifdef SERIAL_DEBUG_OPEN
1375 printk("rs_close ttyS%02d, count = %d\n", info->line, info->count);
1377 if ((tty->count == 1) && (info->count != 1)) {
1379 * Uh, oh. tty->count is 1, which means that the tty
1380 * structure will be freed. Info->count should always
1381 * be one in these conditions. If it's greater than
1382 * one, we've got real problems, since it means the
1383 * serial port won't be shutdown.
1385 printk("rs_close: bad serial port count; tty->count is 1, "
1386 "info->count is %d\n", info->count);
1389 if (--info->count < 0) {
1390 printk("rs_close: bad serial port count for ttyS%02d: %d\n",
1391 info->line, info->count);
1395 restore_flags(flags);
1398 info->flags |= ZILOG_CLOSING;
1400 * Save the termios structure, since this port may have
1401 * separate termios for callout and dialin.
1403 if (info->flags & ZILOG_NORMAL_ACTIVE)
1404 info->normal_termios = *tty->termios;
1405 if (info->flags & ZILOG_CALLOUT_ACTIVE)
1406 info->callout_termios = *tty->termios;
1408 * Now we wait for the transmit buffer to clear; and we notify
1409 * the line discipline to only process XON/XOFF characters.
1412 if (info->closing_wait != ZILOG_CLOSING_WAIT_NONE)
1413 tty_wait_until_sent(tty, info->closing_wait);
1415 * At this point we stop accepting input. To do this, we
1416 * disable the receiver and receive interrupts.
1418 info->zs_channel->curregs[3] &= ~RxENABLE;
1419 write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
1420 info->zs_channel->curregs[1] = 0; /* disable any rx ints */
1421 write_zsreg(info->zs_channel, 1, info->zs_channel->curregs[1]);
1422 ZS_CLEARFIFO(info->zs_channel);
1423 if (info->flags & ZILOG_INITIALIZED) {
1425 * Before we drop DTR, make sure the SCC transmitter
1426 * has completely drained.
1428 rs_wait_until_sent(tty, info->timeout);
1432 if (tty->driver.flush_buffer)
1433 tty->driver.flush_buffer(tty);
1434 if (tty->ldisc.flush_buffer)
1435 tty->ldisc.flush_buffer(tty);
1439 if (info->blocked_open) {
1440 if (info->close_delay) {
1441 current->state = TASK_INTERRUPTIBLE;
1442 schedule_timeout(info->close_delay);
1444 wake_up_interruptible(&info->open_wait);
1446 info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE|
1448 wake_up_interruptible(&info->close_wait);
1449 restore_flags(flags);
1453 * rs_wait_until_sent() --- wait until the transmitter is empty
1455 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1457 struct dec_serial *info = (struct dec_serial *) tty->driver_data;
1458 unsigned long orig_jiffies, char_time;
1460 if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
1463 orig_jiffies = jiffies;
1465 * Set the check interval to be 1/5 of the estimated time to
1466 * send a single character, and make it at least 1. The check
1467 * interval should also be less than the timeout.
1469 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1470 char_time = char_time / 5;
1474 char_time = MIN(char_time, timeout);
1475 while ((read_zsreg(info->zs_channel, 1) & Tx_BUF_EMP) == 0) {
1476 current->state = TASK_INTERRUPTIBLE;
1477 schedule_timeout(char_time);
1478 if (signal_pending(current))
1480 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1483 current->state = TASK_RUNNING;
1487 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1489 void rs_hangup(struct tty_struct *tty)
1491 struct dec_serial * info = (struct dec_serial *)tty->driver_data;
1493 if (serial_paranoia_check(info, tty->device, "rs_hangup"))
1496 rs_flush_buffer(tty);
1500 info->flags &= ~(ZILOG_NORMAL_ACTIVE|ZILOG_CALLOUT_ACTIVE);
1502 wake_up_interruptible(&info->open_wait);
1506 * ------------------------------------------------------------
1507 * rs_open() and friends
1508 * ------------------------------------------------------------
1510 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1511 struct dec_serial *info)
1513 DECLARE_WAITQUEUE(wait, current);
1518 * If the device is in the middle of being closed, then block
1519 * until it's done, and then try again.
1521 if (info->flags & ZILOG_CLOSING) {
1522 interruptible_sleep_on(&info->close_wait);
1523 #ifdef SERIAL_DO_RESTART
1524 return ((info->flags & ZILOG_HUP_NOTIFY) ?
1525 -EAGAIN : -ERESTARTSYS);
1532 * If this is a callout device, then just make sure the normal
1533 * device isn't being used.
1535 if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
1536 if (info->flags & ZILOG_NORMAL_ACTIVE)
1538 if ((info->flags & ZILOG_CALLOUT_ACTIVE) &&
1539 (info->flags & ZILOG_SESSION_LOCKOUT) &&
1540 (info->session != current->session))
1542 if ((info->flags & ZILOG_CALLOUT_ACTIVE) &&
1543 (info->flags & ZILOG_PGRP_LOCKOUT) &&
1544 (info->pgrp != current->pgrp))
1546 info->flags |= ZILOG_CALLOUT_ACTIVE;
1551 * If non-blocking mode is set, or the port is not enabled,
1552 * then make the check up front and then exit.
1554 if ((filp->f_flags & O_NONBLOCK) ||
1555 (tty->flags & (1 << TTY_IO_ERROR))) {
1556 if (info->flags & ZILOG_CALLOUT_ACTIVE)
1558 info->flags |= ZILOG_NORMAL_ACTIVE;
1562 if (info->flags & ZILOG_CALLOUT_ACTIVE) {
1563 if (info->normal_termios.c_cflag & CLOCAL)
1566 if (tty->termios->c_cflag & CLOCAL)
1571 * Block waiting for the carrier detect and the line to become
1572 * free (i.e., not in use by the callout). While we are in
1573 * this loop, info->count is dropped by one, so that
1574 * rs_close() knows when to free things. We restore it upon
1575 * exit, either normal or abnormal.
1578 add_wait_queue(&info->open_wait, &wait);
1579 #ifdef SERIAL_DEBUG_OPEN
1580 printk("block_til_ready before block: ttyS%02d, count = %d\n",
1581 info->line, info->count);
1584 if (!tty_hung_up_p(filp))
1587 info->blocked_open++;
1590 if (!(info->flags & ZILOG_CALLOUT_ACTIVE) &&
1591 (tty->termios->c_cflag & CBAUD))
1592 zs_rtsdtr(info, RTS | DTR, 1);
1594 set_current_state(TASK_INTERRUPTIBLE);
1595 if (tty_hung_up_p(filp) ||
1596 !(info->flags & ZILOG_INITIALIZED)) {
1597 #ifdef SERIAL_DO_RESTART
1598 if (info->flags & ZILOG_HUP_NOTIFY)
1601 retval = -ERESTARTSYS;
1607 if (!(info->flags & ZILOG_CALLOUT_ACTIVE) &&
1608 !(info->flags & ZILOG_CLOSING) &&
1609 (do_clocal || (read_zsreg(info->zs_channel, 0) & DCD)))
1611 if (signal_pending(current)) {
1612 retval = -ERESTARTSYS;
1615 #ifdef SERIAL_DEBUG_OPEN
1616 printk("block_til_ready blocking: ttyS%02d, count = %d\n",
1617 info->line, info->count);
1621 current->state = TASK_RUNNING;
1622 remove_wait_queue(&info->open_wait, &wait);
1623 if (!tty_hung_up_p(filp))
1625 info->blocked_open--;
1626 #ifdef SERIAL_DEBUG_OPEN
1627 printk("block_til_ready after blocking: ttyS%02d, count = %d\n",
1628 info->line, info->count);
1632 info->flags |= ZILOG_NORMAL_ACTIVE;
1637 * This routine is called whenever a serial port is opened. It
1638 * enables interrupts for a serial port, linking in its ZILOG structure into
1639 * the IRQ chain. It also performs the serial-specific
1640 * initialization for the tty structure.
1642 int rs_open(struct tty_struct *tty, struct file * filp)
1644 struct dec_serial *info;
1647 line = MINOR(tty->device) - tty->driver.minor_start;
1648 if ((line < 0) || (line >= zs_channels_found))
1650 info = zs_soft + line;
1655 if (serial_paranoia_check(info, tty->device, "rs_open"))
1657 #ifdef SERIAL_DEBUG_OPEN
1658 printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
1663 tty->driver_data = info;
1667 * If the port is the middle of closing, bail out now
1669 if (tty_hung_up_p(filp) ||
1670 (info->flags & ZILOG_CLOSING)) {
1671 if (info->flags & ZILOG_CLOSING)
1672 interruptible_sleep_on(&info->close_wait);
1673 #ifdef SERIAL_DO_RESTART
1674 return ((info->flags & ZILOG_HUP_NOTIFY) ?
1675 -EAGAIN : -ERESTARTSYS);
1682 * Start up serial port
1684 retval = zs_startup(info);
1688 retval = block_til_ready(tty, filp, info);
1690 #ifdef SERIAL_DEBUG_OPEN
1691 printk("rs_open returning after block_til_ready with %d\n",
1697 if ((info->count == 1) && (info->flags & ZILOG_SPLIT_TERMIOS)) {
1698 if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
1699 *tty->termios = info->normal_termios;
1701 *tty->termios = info->callout_termios;
1704 #ifdef CONFIG_SERIAL_CONSOLE
1705 if (sercons.cflag && sercons.index == line) {
1706 tty->termios->c_cflag = sercons.cflag;
1712 info->session = current->session;
1713 info->pgrp = current->pgrp;
1715 #ifdef SERIAL_DEBUG_OPEN
1716 printk("rs_open ttyS%02d successful...", info->line);
1718 /* tty->low_latency = 1; */
1722 /* Finally, routines used to initialize the serial driver. */
1724 static void __init show_serial_version(void)
1726 printk("DECstation Z8530 serial driver version 0.07\n");
1729 /* Initialize Z8530s zs_channels
1732 static void __init probe_sccs(void)
1734 struct dec_serial **pp;
1735 int i, n, n_chips = 0, n_channels, chip, channel;
1738 * did we get here by accident?
1741 printk("Not on JUNKIO machine, skipping probe_sccs\n");
1746 * When serial console is activated, tc_init has not been called yet
1747 * and system_base is undefined. Unfortunately we have to hardcode
1748 * system_base for this case :-(. HK
1750 switch(mips_machtype) {
1751 #ifdef CONFIG_DECSTATION
1752 case MACH_DS5000_2X0:
1753 system_base = 0xbf800000;
1755 zs_parms = &ds_parms;
1756 zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0];
1757 zs_parms->irq1 = dec_interrupt[DEC_IRQ_SCC1];
1759 case MACH_DS5000_1XX:
1760 system_base = 0xbc000000;
1762 zs_parms = &ds_parms;
1763 zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0];
1764 zs_parms->irq1 = dec_interrupt[DEC_IRQ_SCC1];
1766 case MACH_DS5000_XX:
1767 system_base = 0xbc000000;
1769 zs_parms = &ds_parms;
1770 zs_parms->irq0 = dec_interrupt[DEC_IRQ_SCC0];
1773 #ifdef CONFIG_BAGET_MIPS
1775 system_base = UNI_IO_BASE;
1777 zs_parms = &baget_parms;
1778 zs_init_regs[2] = 0x8;
1782 panic("zs: unsupported bus");
1785 panic("zs: uninitialized parms");
1791 for (chip = 0; chip < n_chips; chip++) {
1792 for (channel = 0; channel <= 1; channel++) {
1794 * The sccs reside on the high byte of the 16 bit IOBUS
1796 zs_channels[n_channels].control =
1797 (volatile unsigned char *)system_base +
1798 (0 == chip ? zs_parms->scc0 : zs_parms->scc1) +
1799 (0 == channel ? zs_parms->channel_a_offset :
1800 zs_parms->channel_b_offset);
1801 zs_channels[n_channels].data =
1802 zs_channels[n_channels].control + 4;
1804 #ifndef CONFIG_SERIAL_CONSOLE
1806 * We're called early and memory managment isn't up, yet.
1807 * Thus check_region would fail.
1809 if (check_region((unsigned long)
1810 zs_channels[n_channels].control,
1811 ZS_CHAN_IO_SIZE) < 0) {
1812 panic("SCC I/O region is not free");
1814 request_region((unsigned long)
1815 zs_channels[n_channels].control,
1816 ZS_CHAN_IO_SIZE, "SCC");
1818 zs_soft[n_channels].zs_channel = &zs_channels[n_channels];
1821 zs_soft[n_channels].irq = zs_parms->irq0;
1823 zs_soft[n_channels].irq = zs_parms->irq1;
1826 * Identification of channel A. Location of channel A
1827 * inside chip depends on mapping of internal address
1828 * the chip decodes channels by.
1829 * CHANNEL_A_NR returns either 0 (in case of
1830 * DECstations) or 1 (in case of Baget).
1832 if (CHANNEL_A_NR == channel)
1833 zs_soft[n_channels].zs_chan_a =
1834 &zs_channels[n_channels+1-2*CHANNEL_A_NR];
1836 zs_soft[n_channels].zs_chan_a =
1837 &zs_channels[n_channels];
1839 *pp = &zs_soft[n_channels];
1840 pp = &zs_soft[n_channels].zs_next;
1846 zs_channels_found = n_channels;
1848 for (n = 0; n < zs_channels_found; n++) {
1849 for (i = 0; i < 16; i++) {
1850 zs_soft[n].zs_channel->curregs[i] = zs_init_regs[i];
1854 /* save_and_cli(flags);
1855 for (n = 0; n < zs_channels_found; n++) {
1856 if (((int)zs_channels[n].control & 0xf) == 1) {
1857 write_zsreg(zs_soft[n].zs_chan_a, R9, FHWRES);
1859 write_zsreg(zs_soft[n].zs_chan_a, R9, 0);
1861 load_zsregs(zs_soft[n].zs_channel, zs_soft[n].zs_channel->curregs);
1863 restore_flags(flags); */
1866 /* zs_init inits the driver */
1867 int __init zs_init(void)
1870 unsigned long flags;
1871 struct dec_serial *info;
1876 /* Setup base handler, and timer table. */
1877 init_bh(SERIAL_BH, do_serial_bh);
1879 /* Find out how many Z8530 SCCs we have */
1883 show_serial_version();
1885 /* Initialize the tty_driver structure */
1886 /* Not all of this is exactly right for us. */
1888 memset(&serial_driver, 0, sizeof(struct tty_driver));
1889 serial_driver.magic = TTY_DRIVER_MAGIC;
1890 #if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
1891 serial_driver.name = "tts/%d";
1893 serial_driver.name = "ttyS";
1895 serial_driver.major = TTY_MAJOR;
1896 serial_driver.minor_start = 64;
1897 serial_driver.num = zs_channels_found;
1898 serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
1899 serial_driver.subtype = SERIAL_TYPE_NORMAL;
1900 serial_driver.init_termios = tty_std_termios;
1902 serial_driver.init_termios.c_cflag =
1903 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1904 serial_driver.flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_NO_DEVFS;
1905 serial_driver.refcount = &serial_refcount;
1906 serial_driver.table = serial_table;
1907 serial_driver.termios = serial_termios;
1908 serial_driver.termios_locked = serial_termios_locked;
1910 serial_driver.open = rs_open;
1911 serial_driver.close = rs_close;
1912 serial_driver.write = rs_write;
1913 serial_driver.flush_chars = rs_flush_chars;
1914 serial_driver.write_room = rs_write_room;
1915 serial_driver.chars_in_buffer = rs_chars_in_buffer;
1916 serial_driver.flush_buffer = rs_flush_buffer;
1917 serial_driver.ioctl = rs_ioctl;
1918 serial_driver.throttle = rs_throttle;
1919 serial_driver.unthrottle = rs_unthrottle;
1920 serial_driver.set_termios = rs_set_termios;
1921 serial_driver.stop = rs_stop;
1922 serial_driver.start = rs_start;
1923 serial_driver.hangup = rs_hangup;
1924 serial_driver.break_ctl = rs_break;
1925 serial_driver.wait_until_sent = rs_wait_until_sent;
1928 * The callout device is just like normal device except for
1929 * major number and the subtype code.
1931 callout_driver = serial_driver;
1932 #if (LINUX_VERSION_CODE > 0x2032D && defined(CONFIG_DEVFS_FS))
1933 callout_driver.name = "cua/%d";
1935 callout_driver.name = "cua";
1937 callout_driver.major = TTYAUX_MAJOR;
1938 callout_driver.subtype = SERIAL_TYPE_CALLOUT;
1940 if (tty_register_driver(&serial_driver))
1941 panic("Couldn't register serial driver");
1942 if (tty_register_driver(&callout_driver))
1943 panic("Couldn't register callout driver");
1945 save_flags(flags); cli();
1947 for (channel = 0; channel < zs_channels_found; ++channel) {
1948 if (request_irq(zs_soft[channel].irq, rs_interrupt, SA_SHIRQ,
1949 "scc", &zs_soft[channel]))
1950 printk(KERN_ERR "decserial: can't get irq %d\n",
1951 zs_soft[channel].irq);
1953 zs_soft[channel].clk_divisor = 16;
1954 zs_soft[channel].zs_baud = get_zsbaud(&zs_soft[channel]);
1957 for (info = zs_chain, i = 0; info; info = info->zs_next, i++) {
1959 /* Needed before interrupts are enabled. */
1963 if (info->hook && info->hook->init_info)
1966 info->magic = SERIAL_MAGIC;
1967 info->port = (int) info->zs_channel->control;
1969 info->custom_divisor = 16;
1970 info->close_delay = 50;
1971 info->closing_wait = 3000;
1974 info->blocked_open = 0;
1975 info->tqueue.routine = do_softint;
1976 info->tqueue.data = info;
1977 info->callout_termios = callout_driver.init_termios;
1978 info->normal_termios = serial_driver.init_termios;
1979 init_waitqueue_head(&info->open_wait);
1980 init_waitqueue_head(&info->close_wait);
1981 printk("ttyS%02d at 0x%08x (irq = %d)", info->line,
1982 info->port, info->irq);
1983 printk(" is a Z85C30 SCC\n");
1984 tty_register_devfs(&serial_driver, 0,
1985 serial_driver.minor_start + info->line);
1986 tty_register_devfs(&callout_driver, 0,
1987 callout_driver.minor_start + info->line);
1991 restore_flags(flags);
1993 for (channel = 0; channel < zs_channels_found; ++channel) {
1994 if (zs_soft[channel].hook &&
1995 zs_soft[channel].hook->init_channel)
1996 (*zs_soft[channel].hook->init_channel)
1997 (&zs_soft[channel]);
2000 for (info = zs_chain, i = 0; info; info = info->zs_next, i++) {
2001 if (info->hook && info->hook->init_info)
2002 (*info->hook->init_info)(info);
2009 * register_serial and unregister_serial allows for serial ports to be
2010 * configured at run-time, to support PCMCIA modems.
2012 /* PowerMac: Unused at this time, just here to make things link. */
2013 int register_serial(struct serial_struct *req)
2018 void unregister_serial(int line)
2024 * polling I/O routines
2027 zs_poll_tx_char(struct dec_serial *info, unsigned char ch)
2029 struct dec_zschannel *chan = info->zs_channel;
2035 while (loops && !(read_zsreg(chan, 0) & Tx_BUF_EMP))
2039 write_zsdata(chan, ch);
2050 zs_poll_rx_char(struct dec_serial *info)
2052 struct dec_zschannel *chan = info->zs_channel;
2058 while (loops && !(read_zsreg(chan, 0) & Rx_CH_AV))
2062 ret = read_zsdata(chan);
2071 unsigned int register_zs_hook(unsigned int channel, struct zs_hook *hook)
2073 struct dec_serial *info = &zs_soft[channel];
2076 printk(__FUNCTION__": line %d has already a hook registered\n", channel);
2085 if (!(info->flags & ZILOG_INITIALIZED))
2088 hook->poll_rx_char = zs_poll_rx_char;
2089 hook->poll_tx_char = zs_poll_tx_char;
2095 unsigned int unregister_zs_hook(unsigned int channel)
2097 struct dec_serial *info = &zs_soft[channel];
2103 printk(__FUNCTION__": trying to unregister hook on line %d,"
2104 " but none is registered\n", channel);
2110 * ------------------------------------------------------------
2111 * Serial console driver
2112 * ------------------------------------------------------------
2114 #ifdef CONFIG_SERIAL_CONSOLE
2118 * Print a string to the serial port trying not to disturb
2119 * any possible real use of the port...
2121 static void serial_console_write(struct console *co, const char *s,
2124 struct dec_serial *info;
2127 info = zs_soft + co->index;
2129 for (i = 0; i < count; i++, s++) {
2131 zs_poll_tx_char(info, '\r');
2132 zs_poll_tx_char(info, *s);
2136 static kdev_t serial_console_device(struct console *c)
2138 return MKDEV(TTY_MAJOR, 64 + c->index);
2142 * Setup initial baud/bits/parity. We do two things here:
2143 * - construct a cflag setting for the first rs_open()
2144 * - initialize the serial port
2145 * Return non-zero if we didn't find a serial port.
2147 static int __init serial_console_setup(struct console *co, char *options)
2149 struct dec_serial *info;
2153 int cflag = CREAD | HUPCL | CLOCAL;
2155 unsigned long flags;
2160 info = zs_soft + co->index;
2168 baud = simple_strtoul(options, NULL, 10);
2170 while(*s >= '0' && *s <= '9')
2179 * Now construct a cflag setting.
2227 save_and_cli(flags);
2230 * Turn on RTS and DTR.
2232 zs_rtsdtr(info, RTS | DTR, 1);
2235 * Finally, enable sequencing
2237 info->zs_channel->curregs[3] |= (RxENABLE | Rx8);
2238 info->zs_channel->curregs[5] |= (TxENAB | Tx8);
2239 info->zs_channel->curregs[9] |= (VIS);
2240 write_zsreg(info->zs_channel, 3, info->zs_channel->curregs[3]);
2241 write_zsreg(info->zs_channel, 5, info->zs_channel->curregs[5]);
2242 write_zsreg(info->zs_channel, 9, info->zs_channel->curregs[9]);
2245 * Clear the interrupt registers.
2247 write_zsreg(info->zs_channel, 0, ERR_RES);
2248 write_zsreg(info->zs_channel, 0, RES_H_IUS);
2251 * Set the speed of the serial port
2255 /* Save the current value of RR0 */
2256 info->read_reg_zero = read_zsreg(info->zs_channel, 0);
2258 zs_soft[co->index].clk_divisor = 16;
2259 zs_soft[co->index].zs_baud = get_zsbaud(&zs_soft[co->index]);
2261 restore_flags(flags);
2266 static struct console sercons = {
2268 write: serial_console_write,
2269 device: serial_console_device,
2270 setup: serial_console_setup,
2271 flags: CON_PRINTBUFFER,
2278 void __init zs_serial_console_init(void)
2280 register_console(&sercons);
2282 #endif /* ifdef CONFIG_SERIAL_CONSOLE */
2285 struct dec_zschannel *zs_kgdbchan;
2286 static unsigned char scc_inittab[] = {
2287 9, 0x80, /* reset A side (CHRA) */
2288 13, 0, /* set baud rate divisor */
2290 14, 1, /* baud rate gen enable, src=rtxc (BRENABL) */
2291 11, 0x50, /* clocks = br gen (RCBR | TCBR) */
2292 5, 0x6a, /* tx 8 bits, assert RTS (Tx8 | TxENAB | RTS) */
2293 4, 0x44, /* x16 clock, 1 stop (SB1 | X16CLK)*/
2294 3, 0xc1, /* rx enable, 8 bits (RxENABLE | Rx8)*/
2297 /* These are for receiving and sending characters under the kgdb
2298 * source level kernel debugger.
2300 void putDebugChar(char kgdb_char)
2302 struct dec_zschannel *chan = zs_kgdbchan;
2303 while ((read_zsreg(chan, 0) & Tx_BUF_EMP) == 0)
2305 write_zsdata(chan, kgdb_char);
2307 char getDebugChar(void)
2309 struct dec_zschannel *chan = zs_kgdbchan;
2310 while((read_zsreg(chan, 0) & Rx_CH_AV) == 0)
2311 eieio(); /*barrier();*/
2312 return read_zsdata(chan);
2314 void kgdb_interruptible(int yes)
2316 struct dec_zschannel *chan = zs_kgdbchan;
2318 nine = read_zsreg(chan, 9);
2320 one = EXT_INT_ENAB|INT_ALL_Rx;
2322 printk("turning serial ints on\n");
2326 printk("turning serial ints off\n");
2328 write_zsreg(chan, 1, one);
2329 write_zsreg(chan, 9, nine);
2332 static int kgdbhook_init_channel(struct dec_serial* info)
2337 static void kgdbhook_init_info(struct dec_serial* info)
2341 static void kgdbhook_rx_char(struct dec_serial* info,
2342 unsigned char ch, unsigned char stat)
2344 if (ch == 0x03 || ch == '$')
2346 if (stat & (Rx_OVR|FRM_ERR|PAR_ERR))
2347 write_zsreg(info->zs_channel, 0, ERR_RES);
2350 /* This sets up the serial port we're using, and turns on
2351 * interrupts for that channel, so kgdb is usable once we're done.
2353 static inline void kgdb_chaninit(struct dec_zschannel *ms, int intson, int bps)
2357 volatile char *sccc = ms->control;
2358 brg = BPS_TO_BRG(bps, zs_parms->clock/16);
2359 printk("setting bps on kgdb line to %d [brg=%x]\n", bps, brg);
2360 for (i = 20000; i != 0; --i) {
2363 for (i = 0; i < sizeof(scc_inittab); ++i) {
2364 write_zsreg(ms, scc_inittab[i], scc_inittab[i+1]);
2368 /* This is called at boot time to prime the kgdb serial debugging
2369 * serial line. The 'tty_num' argument is 0 for /dev/ttya and 1
2370 * for /dev/ttyb which is determined in setup_arch() from the
2371 * boot command line flags.
2373 struct zs_hook zs_kgdbhook = {
2374 init_channel : kgdbhook_init_channel,
2375 init_info : kgdbhook_init_info,
2376 cflags : B38400|CS8|CLOCAL,
2377 rx_char : kgdbhook_rx_char,
2380 void __init zs_kgdb_hook(int tty_num)
2382 /* Find out how many Z8530 SCCs we have */
2385 zs_soft[tty_num].zs_channel = &zs_channels[tty_num];
2386 zs_kgdbchan = zs_soft[tty_num].zs_channel;
2387 zs_soft[tty_num].change_needed = 0;
2388 zs_soft[tty_num].clk_divisor = 16;
2389 zs_soft[tty_num].zs_baud = 38400;
2390 zs_soft[tty_num].hook = &zs_kgdbhook; /* This runs kgdb */
2391 /* Turn on transmitter/receiver at 8-bits/char */
2392 kgdb_chaninit(zs_soft[tty_num].zs_channel, 1, 38400);
2393 printk("KGDB: on channel %d initialized\n", tty_num);
2394 set_debug_traps(); /* init stub */
2396 #endif /* ifdef CONFIG_KGDB */