[PATCH] tty: switch to ktermios
[linux-2.6.git] / drivers / char / amiserial.c
1 /*
2  *  linux/drivers/char/amiserial.c
3  *
4  * Serial driver for the amiga builtin port.
5  *
6  * This code was created by taking serial.c version 4.30 from kernel
7  * release 2.3.22, replacing all hardware related stuff with the
8  * corresponding amiga hardware actions, and removing all irrelevant
9  * code. As a consequence, it uses many of the constants and names
10  * associated with the registers and bits of 16550 compatible UARTS -
11  * but only to keep track of status, etc in the state variables. It
12  * was done this was to make it easier to keep the code in line with
13  * (non hardware specific) changes to serial.c.
14  *
15  * The port is registered with the tty driver as minor device 64, and
16  * therefore other ports should should only use 65 upwards.
17  *
18  * Richard Lucock 28/12/99
19  *
20  *  Copyright (C) 1991, 1992  Linus Torvalds
21  *  Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 
22  *              1998, 1999  Theodore Ts'o
23  *
24  */
25
26 /*
27  * Serial driver configuration section.  Here are the various options:
28  *
29  * SERIAL_PARANOIA_CHECK
30  *              Check the magic number for the async_structure where
31  *              ever possible.
32  */
33
34 #include <linux/delay.h>
35
36 #undef SERIAL_PARANOIA_CHECK
37 #define SERIAL_DO_RESTART
38
39 /* Set of debugging defines */
40
41 #undef SERIAL_DEBUG_INTR
42 #undef SERIAL_DEBUG_OPEN
43 #undef SERIAL_DEBUG_FLOW
44 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
45
46 /* Sanity checks */
47
48 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
49 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
50  tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
51 #else
52 #define DBG_CNT(s)
53 #endif
54
55 /*
56  * End of serial driver configuration section.
57  */
58
59 #include <linux/module.h>
60
61 #include <linux/types.h>
62 #include <linux/serial.h>
63 #include <linux/serialP.h>
64 #include <linux/serial_reg.h>
65 static char *serial_version = "4.30";
66
67 #include <linux/errno.h>
68 #include <linux/signal.h>
69 #include <linux/sched.h>
70 #include <linux/kernel.h>
71 #include <linux/timer.h>
72 #include <linux/interrupt.h>
73 #include <linux/tty.h>
74 #include <linux/tty_flip.h>
75 #include <linux/console.h>
76 #include <linux/major.h>
77 #include <linux/string.h>
78 #include <linux/fcntl.h>
79 #include <linux/ptrace.h>
80 #include <linux/ioport.h>
81 #include <linux/mm.h>
82 #include <linux/slab.h>
83 #include <linux/init.h>
84 #include <linux/bitops.h>
85
86 #include <asm/setup.h>
87
88 #include <asm/system.h>
89
90 #include <asm/irq.h>
91
92 #include <asm/amigahw.h>
93 #include <asm/amigaints.h>
94
95 #define custom amiga_custom
96 static char *serial_name = "Amiga-builtin serial driver";
97
98 static struct tty_driver *serial_driver;
99
100 /* number of characters left in xmit buffer before we ask for more */
101 #define WAKEUP_CHARS 256
102
103 static struct async_struct *IRQ_ports;
104
105 static unsigned char current_ctl_bits;
106
107 static void change_speed(struct async_struct *info, struct ktermios *old);
108 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
109
110
111 static struct serial_state rs_table[1];
112
113 #define NR_PORTS ARRAY_SIZE(rs_table)
114
115 #include <asm/uaccess.h>
116
117 #define serial_isroot() (capable(CAP_SYS_ADMIN))
118
119
120 static inline int serial_paranoia_check(struct async_struct *info,
121                                         char *name, const char *routine)
122 {
123 #ifdef SERIAL_PARANOIA_CHECK
124         static const char *badmagic =
125                 "Warning: bad magic number for serial struct (%s) in %s\n";
126         static const char *badinfo =
127                 "Warning: null async_struct for (%s) in %s\n";
128
129         if (!info) {
130                 printk(badinfo, name, routine);
131                 return 1;
132         }
133         if (info->magic != SERIAL_MAGIC) {
134                 printk(badmagic, name, routine);
135                 return 1;
136         }
137 #endif
138         return 0;
139 }
140
141 /* some serial hardware definitions */
142 #define SDR_OVRUN   (1<<15)
143 #define SDR_RBF     (1<<14)
144 #define SDR_TBE     (1<<13)
145 #define SDR_TSRE    (1<<12)
146
147 #define SERPER_PARENB    (1<<15)
148
149 #define AC_SETCLR   (1<<15)
150 #define AC_UARTBRK  (1<<11)
151
152 #define SER_DTR     (1<<7)
153 #define SER_RTS     (1<<6)
154 #define SER_DCD     (1<<5)
155 #define SER_CTS     (1<<4)
156 #define SER_DSR     (1<<3)
157
158 static __inline__ void rtsdtr_ctrl(int bits)
159 {
160     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
161 }
162
163 /*
164  * ------------------------------------------------------------
165  * rs_stop() and rs_start()
166  *
167  * This routines are called before setting or resetting tty->stopped.
168  * They enable or disable transmitter interrupts, as necessary.
169  * ------------------------------------------------------------
170  */
171 static void rs_stop(struct tty_struct *tty)
172 {
173         struct async_struct *info = (struct async_struct *)tty->driver_data;
174         unsigned long flags;
175
176         if (serial_paranoia_check(info, tty->name, "rs_stop"))
177                 return;
178
179         local_irq_save(flags);
180         if (info->IER & UART_IER_THRI) {
181                 info->IER &= ~UART_IER_THRI;
182                 /* disable Tx interrupt and remove any pending interrupts */
183                 custom.intena = IF_TBE;
184                 mb();
185                 custom.intreq = IF_TBE;
186                 mb();
187         }
188         local_irq_restore(flags);
189 }
190
191 static void rs_start(struct tty_struct *tty)
192 {
193         struct async_struct *info = (struct async_struct *)tty->driver_data;
194         unsigned long flags;
195
196         if (serial_paranoia_check(info, tty->name, "rs_start"))
197                 return;
198
199         local_irq_save(flags);
200         if (info->xmit.head != info->xmit.tail
201             && info->xmit.buf
202             && !(info->IER & UART_IER_THRI)) {
203                 info->IER |= UART_IER_THRI;
204                 custom.intena = IF_SETCLR | IF_TBE;
205                 mb();
206                 /* set a pending Tx Interrupt, transmitter should restart now */
207                 custom.intreq = IF_SETCLR | IF_TBE;
208                 mb();
209         }
210         local_irq_restore(flags);
211 }
212
213 /*
214  * ----------------------------------------------------------------------
215  *
216  * Here starts the interrupt handling routines.  All of the following
217  * subroutines are declared as inline and are folded into
218  * rs_interrupt().  They were separated out for readability's sake.
219  *
220  * Note: rs_interrupt() is a "fast" interrupt, which means that it
221  * runs with interrupts turned off.  People who may want to modify
222  * rs_interrupt() should try to keep the interrupt handler as fast as
223  * possible.  After you are done making modifications, it is not a bad
224  * idea to do:
225  * 
226  * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
227  *
228  * and look at the resulting assemble code in serial.s.
229  *
230  *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
231  * -----------------------------------------------------------------------
232  */
233
234 /*
235  * This routine is used by the interrupt handler to schedule
236  * processing in the software interrupt portion of the driver.
237  */
238 static void rs_sched_event(struct async_struct *info,
239                            int event)
240 {
241         info->event |= 1 << event;
242         tasklet_schedule(&info->tlet);
243 }
244
245 static void receive_chars(struct async_struct *info)
246 {
247         int status;
248         int serdatr;
249         struct tty_struct *tty = info->tty;
250         unsigned char ch, flag;
251         struct  async_icount *icount;
252         int oe = 0;
253
254         icount = &info->state->icount;
255
256         status = UART_LSR_DR; /* We obviously have a character! */
257         serdatr = custom.serdatr;
258         mb();
259         custom.intreq = IF_RBF;
260         mb();
261
262         if((serdatr & 0x1ff) == 0)
263             status |= UART_LSR_BI;
264         if(serdatr & SDR_OVRUN)
265             status |= UART_LSR_OE;
266
267         ch = serdatr & 0xff;
268         icount->rx++;
269
270 #ifdef SERIAL_DEBUG_INTR
271         printk("DR%02x:%02x...", ch, status);
272 #endif
273         flag = TTY_NORMAL;
274
275         /*
276          * We don't handle parity or frame errors - but I have left
277          * the code in, since I'm not sure that the errors can't be
278          * detected.
279          */
280
281         if (status & (UART_LSR_BI | UART_LSR_PE |
282                       UART_LSR_FE | UART_LSR_OE)) {
283           /*
284            * For statistics only
285            */
286           if (status & UART_LSR_BI) {
287             status &= ~(UART_LSR_FE | UART_LSR_PE);
288             icount->brk++;
289           } else if (status & UART_LSR_PE)
290             icount->parity++;
291           else if (status & UART_LSR_FE)
292             icount->frame++;
293           if (status & UART_LSR_OE)
294             icount->overrun++;
295
296           /*
297            * Now check to see if character should be
298            * ignored, and mask off conditions which
299            * should be ignored.
300            */
301           if (status & info->ignore_status_mask)
302             goto out;
303
304           status &= info->read_status_mask;
305
306           if (status & (UART_LSR_BI)) {
307 #ifdef SERIAL_DEBUG_INTR
308             printk("handling break....");
309 #endif
310             flag = TTY_BREAK;
311             if (info->flags & ASYNC_SAK)
312               do_SAK(tty);
313           } else if (status & UART_LSR_PE)
314             flag = TTY_PARITY;
315           else if (status & UART_LSR_FE)
316             flag = TTY_FRAME;
317           if (status & UART_LSR_OE) {
318             /*
319              * Overrun is special, since it's
320              * reported immediately, and doesn't
321              * affect the current character
322              */
323              oe = 1;
324           }
325         }
326         tty_insert_flip_char(tty, ch, flag);
327         if (oe == 1)
328                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
329         tty_flip_buffer_push(tty);
330 out:
331         return;
332 }
333
334 static void transmit_chars(struct async_struct *info)
335 {
336         custom.intreq = IF_TBE;
337         mb();
338         if (info->x_char) {
339                 custom.serdat = info->x_char | 0x100;
340                 mb();
341                 info->state->icount.tx++;
342                 info->x_char = 0;
343                 return;
344         }
345         if (info->xmit.head == info->xmit.tail
346             || info->tty->stopped
347             || info->tty->hw_stopped) {
348                 info->IER &= ~UART_IER_THRI;
349                 custom.intena = IF_TBE;
350                 mb();
351                 return;
352         }
353
354         custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
355         mb();
356         info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
357         info->state->icount.tx++;
358
359         if (CIRC_CNT(info->xmit.head,
360                      info->xmit.tail,
361                      SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
362                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
363
364 #ifdef SERIAL_DEBUG_INTR
365         printk("THRE...");
366 #endif
367         if (info->xmit.head == info->xmit.tail) {
368                 custom.intena = IF_TBE;
369                 mb();
370                 info->IER &= ~UART_IER_THRI;
371         }
372 }
373
374 static void check_modem_status(struct async_struct *info)
375 {
376         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
377         unsigned char dstatus;
378         struct  async_icount *icount;
379
380         /* Determine bits that have changed */
381         dstatus = status ^ current_ctl_bits;
382         current_ctl_bits = status;
383
384         if (dstatus) {
385                 icount = &info->state->icount;
386                 /* update input line counters */
387                 if (dstatus & SER_DSR)
388                         icount->dsr++;
389                 if (dstatus & SER_DCD) {
390                         icount->dcd++;
391 #ifdef CONFIG_HARD_PPS
392                         if ((info->flags & ASYNC_HARDPPS_CD) &&
393                             !(status & SER_DCD))
394                                 hardpps();
395 #endif
396                 }
397                 if (dstatus & SER_CTS)
398                         icount->cts++;
399                 wake_up_interruptible(&info->delta_msr_wait);
400         }
401
402         if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
403 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
404                 printk("ttyS%d CD now %s...", info->line,
405                        (!(status & SER_DCD)) ? "on" : "off");
406 #endif
407                 if (!(status & SER_DCD))
408                         wake_up_interruptible(&info->open_wait);
409                 else {
410 #ifdef SERIAL_DEBUG_OPEN
411                         printk("doing serial hangup...");
412 #endif
413                         if (info->tty)
414                                 tty_hangup(info->tty);
415                 }
416         }
417         if (info->flags & ASYNC_CTS_FLOW) {
418                 if (info->tty->hw_stopped) {
419                         if (!(status & SER_CTS)) {
420 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
421                                 printk("CTS tx start...");
422 #endif
423                                 info->tty->hw_stopped = 0;
424                                 info->IER |= UART_IER_THRI;
425                                 custom.intena = IF_SETCLR | IF_TBE;
426                                 mb();
427                                 /* set a pending Tx Interrupt, transmitter should restart now */
428                                 custom.intreq = IF_SETCLR | IF_TBE;
429                                 mb();
430                                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
431                                 return;
432                         }
433                 } else {
434                         if ((status & SER_CTS)) {
435 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
436                                 printk("CTS tx stop...");
437 #endif
438                                 info->tty->hw_stopped = 1;
439                                 info->IER &= ~UART_IER_THRI;
440                                 /* disable Tx interrupt and remove any pending interrupts */
441                                 custom.intena = IF_TBE;
442                                 mb();
443                                 custom.intreq = IF_TBE;
444                                 mb();
445                         }
446                 }
447         }
448 }
449
450 static irqreturn_t ser_vbl_int( int irq, void *data)
451 {
452         /* vbl is just a periodic interrupt we tie into to update modem status */
453         struct async_struct * info = IRQ_ports;
454         /*
455          * TBD - is it better to unregister from this interrupt or to
456          * ignore it if MSI is clear ?
457          */
458         if(info->IER & UART_IER_MSI)
459           check_modem_status(info);
460         return IRQ_HANDLED;
461 }
462
463 static irqreturn_t ser_rx_int(int irq, void *dev_id)
464 {
465         struct async_struct * info;
466
467 #ifdef SERIAL_DEBUG_INTR
468         printk("ser_rx_int...");
469 #endif
470
471         info = IRQ_ports;
472         if (!info || !info->tty)
473                 return IRQ_NONE;
474
475         receive_chars(info);
476         info->last_active = jiffies;
477 #ifdef SERIAL_DEBUG_INTR
478         printk("end.\n");
479 #endif
480         return IRQ_HANDLED;
481 }
482
483 static irqreturn_t ser_tx_int(int irq, void *dev_id)
484 {
485         struct async_struct * info;
486
487         if (custom.serdatr & SDR_TBE) {
488 #ifdef SERIAL_DEBUG_INTR
489           printk("ser_tx_int...");
490 #endif
491
492           info = IRQ_ports;
493           if (!info || !info->tty)
494                 return IRQ_NONE;
495
496           transmit_chars(info);
497           info->last_active = jiffies;
498 #ifdef SERIAL_DEBUG_INTR
499           printk("end.\n");
500 #endif
501         }
502         return IRQ_HANDLED;
503 }
504
505 /*
506  * -------------------------------------------------------------------
507  * Here ends the serial interrupt routines.
508  * -------------------------------------------------------------------
509  */
510
511 /*
512  * This routine is used to handle the "bottom half" processing for the
513  * serial driver, known also the "software interrupt" processing.
514  * This processing is done at the kernel interrupt level, after the
515  * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
516  * is where time-consuming activities which can not be done in the
517  * interrupt driver proper are done; the interrupt driver schedules
518  * them using rs_sched_event(), and they get done here.
519  */
520
521 static void do_softint(unsigned long private_)
522 {
523         struct async_struct     *info = (struct async_struct *) private_;
524         struct tty_struct       *tty;
525
526         tty = info->tty;
527         if (!tty)
528                 return;
529
530         if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
531                 tty_wakeup(tty);
532                 wake_up_interruptible(&tty->write_wait);
533         }
534 }
535
536 /*
537  * ---------------------------------------------------------------
538  * Low level utility subroutines for the serial driver:  routines to
539  * figure out the appropriate timeout for an interrupt chain, routines
540  * to initialize and startup a serial port, and routines to shutdown a
541  * serial port.  Useful stuff like that.
542  * ---------------------------------------------------------------
543  */
544
545 static int startup(struct async_struct * info)
546 {
547         unsigned long flags;
548         int     retval=0;
549         unsigned long page;
550
551         page = get_zeroed_page(GFP_KERNEL);
552         if (!page)
553                 return -ENOMEM;
554
555         local_irq_save(flags);
556
557         if (info->flags & ASYNC_INITIALIZED) {
558                 free_page(page);
559                 goto errout;
560         }
561
562         if (info->xmit.buf)
563                 free_page(page);
564         else
565                 info->xmit.buf = (unsigned char *) page;
566
567 #ifdef SERIAL_DEBUG_OPEN
568         printk("starting up ttys%d ...", info->line);
569 #endif
570
571         /* Clear anything in the input buffer */
572
573         custom.intreq = IF_RBF;
574         mb();
575
576         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
577         if (retval) {
578           if (serial_isroot()) {
579             if (info->tty)
580               set_bit(TTY_IO_ERROR,
581                       &info->tty->flags);
582             retval = 0;
583           }
584           goto errout;
585         }
586
587         /* enable both Rx and Tx interrupts */
588         custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
589         mb();
590         info->IER = UART_IER_MSI;
591
592         /* remember current state of the DCD and CTS bits */
593         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
594
595         IRQ_ports = info;
596
597         info->MCR = 0;
598         if (info->tty->termios->c_cflag & CBAUD)
599           info->MCR = SER_DTR | SER_RTS;
600         rtsdtr_ctrl(info->MCR);
601
602         if (info->tty)
603                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
604         info->xmit.head = info->xmit.tail = 0;
605
606         /*
607          * Set up the tty->alt_speed kludge
608          */
609         if (info->tty) {
610                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
611                         info->tty->alt_speed = 57600;
612                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
613                         info->tty->alt_speed = 115200;
614                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
615                         info->tty->alt_speed = 230400;
616                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
617                         info->tty->alt_speed = 460800;
618         }
619
620         /*
621          * and set the speed of the serial port
622          */
623         change_speed(info, NULL);
624
625         info->flags |= ASYNC_INITIALIZED;
626         local_irq_restore(flags);
627         return 0;
628
629 errout:
630         local_irq_restore(flags);
631         return retval;
632 }
633
634 /*
635  * This routine will shutdown a serial port; interrupts are disabled, and
636  * DTR is dropped if the hangup on close termio flag is on.
637  */
638 static void shutdown(struct async_struct * info)
639 {
640         unsigned long   flags;
641         struct serial_state *state;
642
643         if (!(info->flags & ASYNC_INITIALIZED))
644                 return;
645
646         state = info->state;
647
648 #ifdef SERIAL_DEBUG_OPEN
649         printk("Shutting down serial port %d ....\n", info->line);
650 #endif
651
652         local_irq_save(flags); /* Disable interrupts */
653
654         /*
655          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
656          * here so the queue might never be waken up
657          */
658         wake_up_interruptible(&info->delta_msr_wait);
659
660         IRQ_ports = NULL;
661
662         /*
663          * Free the IRQ, if necessary
664          */
665         free_irq(IRQ_AMIGA_VERTB, info);
666
667         if (info->xmit.buf) {
668                 free_page((unsigned long) info->xmit.buf);
669                 info->xmit.buf = NULL;
670         }
671
672         info->IER = 0;
673         custom.intena = IF_RBF | IF_TBE;
674         mb();
675
676         /* disable break condition */
677         custom.adkcon = AC_UARTBRK;
678         mb();
679
680         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
681                 info->MCR &= ~(SER_DTR|SER_RTS);
682         rtsdtr_ctrl(info->MCR);
683
684         if (info->tty)
685                 set_bit(TTY_IO_ERROR, &info->tty->flags);
686
687         info->flags &= ~ASYNC_INITIALIZED;
688         local_irq_restore(flags);
689 }
690
691
692 /*
693  * This routine is called to set the UART divisor registers to match
694  * the specified baud rate for a serial port.
695  */
696 static void change_speed(struct async_struct *info,
697                          struct ktermios *old_termios)
698 {
699         int     quot = 0, baud_base, baud;
700         unsigned cflag, cval = 0;
701         int     bits;
702         unsigned long   flags;
703
704         if (!info->tty || !info->tty->termios)
705                 return;
706         cflag = info->tty->termios->c_cflag;
707
708         /* Byte size is always 8 bits plus parity bit if requested */
709
710         cval = 3; bits = 10;
711         if (cflag & CSTOPB) {
712                 cval |= 0x04;
713                 bits++;
714         }
715         if (cflag & PARENB) {
716                 cval |= UART_LCR_PARITY;
717                 bits++;
718         }
719         if (!(cflag & PARODD))
720                 cval |= UART_LCR_EPAR;
721 #ifdef CMSPAR
722         if (cflag & CMSPAR)
723                 cval |= UART_LCR_SPAR;
724 #endif
725
726         /* Determine divisor based on baud rate */
727         baud = tty_get_baud_rate(info->tty);
728         if (!baud)
729                 baud = 9600;    /* B0 transition handled in rs_set_termios */
730         baud_base = info->state->baud_base;
731         if (baud == 38400 &&
732             ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
733                 quot = info->state->custom_divisor;
734         else {
735                 if (baud == 134)
736                         /* Special case since 134 is really 134.5 */
737                         quot = (2*baud_base / 269);
738                 else if (baud)
739                         quot = baud_base / baud;
740         }
741         /* If the quotient is zero refuse the change */
742         if (!quot && old_termios) {
743                 info->tty->termios->c_cflag &= ~CBAUD;
744                 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
745                 baud = tty_get_baud_rate(info->tty);
746                 if (!baud)
747                         baud = 9600;
748                 if (baud == 38400 &&
749                     ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
750                         quot = info->state->custom_divisor;
751                 else {
752                         if (baud == 134)
753                                 /* Special case since 134 is really 134.5 */
754                                 quot = (2*baud_base / 269);
755                         else if (baud)
756                                 quot = baud_base / baud;
757                 }
758         }
759         /* As a last resort, if the quotient is zero, default to 9600 bps */
760         if (!quot)
761                 quot = baud_base / 9600;
762         info->quot = quot;
763         info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
764         info->timeout += HZ/50;         /* Add .02 seconds of slop */
765
766         /* CTS flow control flag and modem status interrupts */
767         info->IER &= ~UART_IER_MSI;
768         if (info->flags & ASYNC_HARDPPS_CD)
769                 info->IER |= UART_IER_MSI;
770         if (cflag & CRTSCTS) {
771                 info->flags |= ASYNC_CTS_FLOW;
772                 info->IER |= UART_IER_MSI;
773         } else
774                 info->flags &= ~ASYNC_CTS_FLOW;
775         if (cflag & CLOCAL)
776                 info->flags &= ~ASYNC_CHECK_CD;
777         else {
778                 info->flags |= ASYNC_CHECK_CD;
779                 info->IER |= UART_IER_MSI;
780         }
781         /* TBD:
782          * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
783          */
784
785         /*
786          * Set up parity check flag
787          */
788 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
789
790         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
791         if (I_INPCK(info->tty))
792                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
793         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
794                 info->read_status_mask |= UART_LSR_BI;
795
796         /*
797          * Characters to ignore
798          */
799         info->ignore_status_mask = 0;
800         if (I_IGNPAR(info->tty))
801                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
802         if (I_IGNBRK(info->tty)) {
803                 info->ignore_status_mask |= UART_LSR_BI;
804                 /*
805                  * If we're ignore parity and break indicators, ignore 
806                  * overruns too.  (For real raw support).
807                  */
808                 if (I_IGNPAR(info->tty))
809                         info->ignore_status_mask |= UART_LSR_OE;
810         }
811         /*
812          * !!! ignore all characters if CREAD is not set
813          */
814         if ((cflag & CREAD) == 0)
815                 info->ignore_status_mask |= UART_LSR_DR;
816         local_irq_save(flags);
817
818         {
819           short serper;
820
821         /* Set up the baud rate */
822           serper = quot - 1;
823
824         /* Enable or disable parity bit */
825
826         if(cval & UART_LCR_PARITY)
827           serper |= (SERPER_PARENB);
828
829         custom.serper = serper;
830         mb();
831         }
832
833         info->LCR = cval;                               /* Save LCR */
834         local_irq_restore(flags);
835 }
836
837 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
838 {
839         struct async_struct *info;
840         unsigned long flags;
841
842         if (!tty)
843                 return;
844
845         info = tty->driver_data;
846
847         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
848                 return;
849
850         if (!info->xmit.buf)
851                 return;
852
853         local_irq_save(flags);
854         if (CIRC_SPACE(info->xmit.head,
855                        info->xmit.tail,
856                        SERIAL_XMIT_SIZE) == 0) {
857                 local_irq_restore(flags);
858                 return;
859         }
860
861         info->xmit.buf[info->xmit.head++] = ch;
862         info->xmit.head &= SERIAL_XMIT_SIZE-1;
863         local_irq_restore(flags);
864 }
865
866 static void rs_flush_chars(struct tty_struct *tty)
867 {
868         struct async_struct *info = (struct async_struct *)tty->driver_data;
869         unsigned long flags;
870
871         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
872                 return;
873
874         if (info->xmit.head == info->xmit.tail
875             || tty->stopped
876             || tty->hw_stopped
877             || !info->xmit.buf)
878                 return;
879
880         local_irq_save(flags);
881         info->IER |= UART_IER_THRI;
882         custom.intena = IF_SETCLR | IF_TBE;
883         mb();
884         /* set a pending Tx Interrupt, transmitter should restart now */
885         custom.intreq = IF_SETCLR | IF_TBE;
886         mb();
887         local_irq_restore(flags);
888 }
889
890 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
891 {
892         int     c, ret = 0;
893         struct async_struct *info;
894         unsigned long flags;
895
896         if (!tty)
897                 return 0;
898
899         info = tty->driver_data;
900
901         if (serial_paranoia_check(info, tty->name, "rs_write"))
902                 return 0;
903
904         if (!info->xmit.buf)
905                 return 0;
906
907         local_save_flags(flags);
908         local_irq_disable();
909         while (1) {
910                 c = CIRC_SPACE_TO_END(info->xmit.head,
911                                       info->xmit.tail,
912                                       SERIAL_XMIT_SIZE);
913                 if (count < c)
914                         c = count;
915                 if (c <= 0) {
916                         break;
917                 }
918                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
919                 info->xmit.head = ((info->xmit.head + c) &
920                                    (SERIAL_XMIT_SIZE-1));
921                 buf += c;
922                 count -= c;
923                 ret += c;
924         }
925         local_irq_restore(flags);
926
927         if (info->xmit.head != info->xmit.tail
928             && !tty->stopped
929             && !tty->hw_stopped
930             && !(info->IER & UART_IER_THRI)) {
931                 info->IER |= UART_IER_THRI;
932                 local_irq_disable();
933                 custom.intena = IF_SETCLR | IF_TBE;
934                 mb();
935                 /* set a pending Tx Interrupt, transmitter should restart now */
936                 custom.intreq = IF_SETCLR | IF_TBE;
937                 mb();
938                 local_irq_restore(flags);
939         }
940         return ret;
941 }
942
943 static int rs_write_room(struct tty_struct *tty)
944 {
945         struct async_struct *info = (struct async_struct *)tty->driver_data;
946
947         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
948                 return 0;
949         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
950 }
951
952 static int rs_chars_in_buffer(struct tty_struct *tty)
953 {
954         struct async_struct *info = (struct async_struct *)tty->driver_data;
955
956         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
957                 return 0;
958         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
959 }
960
961 static void rs_flush_buffer(struct tty_struct *tty)
962 {
963         struct async_struct *info = (struct async_struct *)tty->driver_data;
964         unsigned long flags;
965
966         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
967                 return;
968         local_irq_save(flags);
969         info->xmit.head = info->xmit.tail = 0;
970         local_irq_restore(flags);
971         wake_up_interruptible(&tty->write_wait);
972         tty_wakeup(tty);
973 }
974
975 /*
976  * This function is used to send a high-priority XON/XOFF character to
977  * the device
978  */
979 static void rs_send_xchar(struct tty_struct *tty, char ch)
980 {
981         struct async_struct *info = (struct async_struct *)tty->driver_data;
982         unsigned long flags;
983
984         if (serial_paranoia_check(info, tty->name, "rs_send_char"))
985                 return;
986
987         info->x_char = ch;
988         if (ch) {
989                 /* Make sure transmit interrupts are on */
990
991                 /* Check this ! */
992                 local_irq_save(flags);
993                 if(!(custom.intenar & IF_TBE)) {
994                     custom.intena = IF_SETCLR | IF_TBE;
995                     mb();
996                     /* set a pending Tx Interrupt, transmitter should restart now */
997                     custom.intreq = IF_SETCLR | IF_TBE;
998                     mb();
999                 }
1000                 local_irq_restore(flags);
1001
1002                 info->IER |= UART_IER_THRI;
1003         }
1004 }
1005
1006 /*
1007  * ------------------------------------------------------------
1008  * rs_throttle()
1009  * 
1010  * This routine is called by the upper-layer tty layer to signal that
1011  * incoming characters should be throttled.
1012  * ------------------------------------------------------------
1013  */
1014 static void rs_throttle(struct tty_struct * tty)
1015 {
1016         struct async_struct *info = (struct async_struct *)tty->driver_data;
1017         unsigned long flags;
1018 #ifdef SERIAL_DEBUG_THROTTLE
1019         char    buf[64];
1020
1021         printk("throttle %s: %d....\n", tty_name(tty, buf),
1022                tty->ldisc.chars_in_buffer(tty));
1023 #endif
1024
1025         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1026                 return;
1027
1028         if (I_IXOFF(tty))
1029                 rs_send_xchar(tty, STOP_CHAR(tty));
1030
1031         if (tty->termios->c_cflag & CRTSCTS)
1032                 info->MCR &= ~SER_RTS;
1033
1034         local_irq_save(flags);
1035         rtsdtr_ctrl(info->MCR);
1036         local_irq_restore(flags);
1037 }
1038
1039 static void rs_unthrottle(struct tty_struct * tty)
1040 {
1041         struct async_struct *info = (struct async_struct *)tty->driver_data;
1042         unsigned long flags;
1043 #ifdef SERIAL_DEBUG_THROTTLE
1044         char    buf[64];
1045
1046         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1047                tty->ldisc.chars_in_buffer(tty));
1048 #endif
1049
1050         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1051                 return;
1052
1053         if (I_IXOFF(tty)) {
1054                 if (info->x_char)
1055                         info->x_char = 0;
1056                 else
1057                         rs_send_xchar(tty, START_CHAR(tty));
1058         }
1059         if (tty->termios->c_cflag & CRTSCTS)
1060                 info->MCR |= SER_RTS;
1061         local_irq_save(flags);
1062         rtsdtr_ctrl(info->MCR);
1063         local_irq_restore(flags);
1064 }
1065
1066 /*
1067  * ------------------------------------------------------------
1068  * rs_ioctl() and friends
1069  * ------------------------------------------------------------
1070  */
1071
1072 static int get_serial_info(struct async_struct * info,
1073                            struct serial_struct __user * retinfo)
1074 {
1075         struct serial_struct tmp;
1076         struct serial_state *state = info->state;
1077    
1078         if (!retinfo)
1079                 return -EFAULT;
1080         memset(&tmp, 0, sizeof(tmp));
1081         tmp.type = state->type;
1082         tmp.line = state->line;
1083         tmp.port = state->port;
1084         tmp.irq = state->irq;
1085         tmp.flags = state->flags;
1086         tmp.xmit_fifo_size = state->xmit_fifo_size;
1087         tmp.baud_base = state->baud_base;
1088         tmp.close_delay = state->close_delay;
1089         tmp.closing_wait = state->closing_wait;
1090         tmp.custom_divisor = state->custom_divisor;
1091         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1092                 return -EFAULT;
1093         return 0;
1094 }
1095
1096 static int set_serial_info(struct async_struct * info,
1097                            struct serial_struct __user * new_info)
1098 {
1099         struct serial_struct new_serial;
1100         struct serial_state old_state, *state;
1101         unsigned int            change_irq,change_port;
1102         int                     retval = 0;
1103
1104         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1105                 return -EFAULT;
1106         state = info->state;
1107         old_state = *state;
1108   
1109         change_irq = new_serial.irq != state->irq;
1110         change_port = (new_serial.port != state->port);
1111         if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size))
1112           return -EINVAL;
1113   
1114         if (!serial_isroot()) {
1115                 if ((new_serial.baud_base != state->baud_base) ||
1116                     (new_serial.close_delay != state->close_delay) ||
1117                     (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1118                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1119                      (state->flags & ~ASYNC_USR_MASK)))
1120                         return -EPERM;
1121                 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1122                                (new_serial.flags & ASYNC_USR_MASK));
1123                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1124                                (new_serial.flags & ASYNC_USR_MASK));
1125                 state->custom_divisor = new_serial.custom_divisor;
1126                 goto check_and_exit;
1127         }
1128
1129         if (new_serial.baud_base < 9600)
1130                 return -EINVAL;
1131
1132         /*
1133          * OK, past this point, all the error checking has been done.
1134          * At this point, we start making changes.....
1135          */
1136
1137         state->baud_base = new_serial.baud_base;
1138         state->flags = ((state->flags & ~ASYNC_FLAGS) |
1139                         (new_serial.flags & ASYNC_FLAGS));
1140         info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1141                        (info->flags & ASYNC_INTERNAL_FLAGS));
1142         state->custom_divisor = new_serial.custom_divisor;
1143         state->close_delay = new_serial.close_delay * HZ/100;
1144         state->closing_wait = new_serial.closing_wait * HZ/100;
1145         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1146
1147 check_and_exit:
1148         if (info->flags & ASYNC_INITIALIZED) {
1149                 if (((old_state.flags & ASYNC_SPD_MASK) !=
1150                      (state->flags & ASYNC_SPD_MASK)) ||
1151                     (old_state.custom_divisor != state->custom_divisor)) {
1152                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1153                                 info->tty->alt_speed = 57600;
1154                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1155                                 info->tty->alt_speed = 115200;
1156                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1157                                 info->tty->alt_speed = 230400;
1158                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1159                                 info->tty->alt_speed = 460800;
1160                         change_speed(info, NULL);
1161                 }
1162         } else
1163                 retval = startup(info);
1164         return retval;
1165 }
1166
1167
1168 /*
1169  * get_lsr_info - get line status register info
1170  *
1171  * Purpose: Let user call ioctl() to get info when the UART physically
1172  *          is emptied.  On bus types like RS485, the transmitter must
1173  *          release the bus after transmitting. This must be done when
1174  *          the transmit shift register is empty, not be done when the
1175  *          transmit holding register is empty.  This functionality
1176  *          allows an RS485 driver to be written in user space. 
1177  */
1178 static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
1179 {
1180         unsigned char status;
1181         unsigned int result;
1182         unsigned long flags;
1183
1184         local_irq_save(flags);
1185         status = custom.serdatr;
1186         mb();
1187         local_irq_restore(flags);
1188         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1189         if (copy_to_user(value, &result, sizeof(int)))
1190                 return -EFAULT;
1191         return 0;
1192 }
1193
1194
1195 static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1196 {
1197         struct async_struct * info = (struct async_struct *)tty->driver_data;
1198         unsigned char control, status;
1199         unsigned long flags;
1200
1201         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1202                 return -ENODEV;
1203         if (tty->flags & (1 << TTY_IO_ERROR))
1204                 return -EIO;
1205
1206         control = info->MCR;
1207         local_irq_save(flags);
1208         status = ciab.pra;
1209         local_irq_restore(flags);
1210         return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1211                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1212                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1213                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1214                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1215 }
1216
1217 static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1218                        unsigned int set, unsigned int clear)
1219 {
1220         struct async_struct * info = (struct async_struct *)tty->driver_data;
1221         unsigned long flags;
1222
1223         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1224                 return -ENODEV;
1225         if (tty->flags & (1 << TTY_IO_ERROR))
1226                 return -EIO;
1227
1228         local_irq_save(flags);
1229         if (set & TIOCM_RTS)
1230                 info->MCR |= SER_RTS;
1231         if (set & TIOCM_DTR)
1232                 info->MCR |= SER_DTR;
1233         if (clear & TIOCM_RTS)
1234                 info->MCR &= ~SER_RTS;
1235         if (clear & TIOCM_DTR)
1236                 info->MCR &= ~SER_DTR;
1237         rtsdtr_ctrl(info->MCR);
1238         local_irq_restore(flags);
1239         return 0;
1240 }
1241
1242 /*
1243  * rs_break() --- routine which turns the break handling on or off
1244  */
1245 static void rs_break(struct tty_struct *tty, int break_state)
1246 {
1247         struct async_struct * info = (struct async_struct *)tty->driver_data;
1248         unsigned long flags;
1249
1250         if (serial_paranoia_check(info, tty->name, "rs_break"))
1251                 return;
1252
1253         local_irq_save(flags);
1254         if (break_state == -1)
1255           custom.adkcon = AC_SETCLR | AC_UARTBRK;
1256         else
1257           custom.adkcon = AC_UARTBRK;
1258         mb();
1259         local_irq_restore(flags);
1260 }
1261
1262
1263 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1264                     unsigned int cmd, unsigned long arg)
1265 {
1266         struct async_struct * info = (struct async_struct *)tty->driver_data;
1267         struct async_icount cprev, cnow;        /* kernel counter temps */
1268         struct serial_icounter_struct icount;
1269         void __user *argp = (void __user *)arg;
1270         unsigned long flags;
1271
1272         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1273                 return -ENODEV;
1274
1275         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1276             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1277             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1278                 if (tty->flags & (1 << TTY_IO_ERROR))
1279                     return -EIO;
1280         }
1281
1282         switch (cmd) {
1283                 case TIOCGSERIAL:
1284                         return get_serial_info(info, argp);
1285                 case TIOCSSERIAL:
1286                         return set_serial_info(info, argp);
1287                 case TIOCSERCONFIG:
1288                         return 0;
1289
1290                 case TIOCSERGETLSR: /* Get line status register */
1291                         return get_lsr_info(info, argp);
1292
1293                 case TIOCSERGSTRUCT:
1294                         if (copy_to_user(argp,
1295                                          info, sizeof(struct async_struct)))
1296                                 return -EFAULT;
1297                         return 0;
1298
1299                 /*
1300                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1301                  * - mask passed in arg for lines of interest
1302                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1303                  * Caller should use TIOCGICOUNT to see which one it was
1304                  */
1305                 case TIOCMIWAIT:
1306                         local_irq_save(flags);
1307                         /* note the counters on entry */
1308                         cprev = info->state->icount;
1309                         local_irq_restore(flags);
1310                         while (1) {
1311                                 interruptible_sleep_on(&info->delta_msr_wait);
1312                                 /* see if a signal did it */
1313                                 if (signal_pending(current))
1314                                         return -ERESTARTSYS;
1315                                 local_irq_save(flags);
1316                                 cnow = info->state->icount; /* atomic copy */
1317                                 local_irq_restore(flags);
1318                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 
1319                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1320                                         return -EIO; /* no change => error */
1321                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1322                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1323                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1324                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1325                                         return 0;
1326                                 }
1327                                 cprev = cnow;
1328                         }
1329                         /* NOTREACHED */
1330
1331                 /* 
1332                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1333                  * Return: write counters to the user passed counter struct
1334                  * NB: both 1->0 and 0->1 transitions are counted except for
1335                  *     RI where only 0->1 is counted.
1336                  */
1337                 case TIOCGICOUNT:
1338                         local_irq_save(flags);
1339                         cnow = info->state->icount;
1340                         local_irq_restore(flags);
1341                         icount.cts = cnow.cts;
1342                         icount.dsr = cnow.dsr;
1343                         icount.rng = cnow.rng;
1344                         icount.dcd = cnow.dcd;
1345                         icount.rx = cnow.rx;
1346                         icount.tx = cnow.tx;
1347                         icount.frame = cnow.frame;
1348                         icount.overrun = cnow.overrun;
1349                         icount.parity = cnow.parity;
1350                         icount.brk = cnow.brk;
1351                         icount.buf_overrun = cnow.buf_overrun;
1352
1353                         if (copy_to_user(argp, &icount, sizeof(icount)))
1354                                 return -EFAULT;
1355                         return 0;
1356                 case TIOCSERGWILD:
1357                 case TIOCSERSWILD:
1358                         /* "setserial -W" is called in Debian boot */
1359                         printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1360                         return 0;
1361
1362                 default:
1363                         return -ENOIOCTLCMD;
1364                 }
1365         return 0;
1366 }
1367
1368 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1369 {
1370         struct async_struct *info = (struct async_struct *)tty->driver_data;
1371         unsigned long flags;
1372         unsigned int cflag = tty->termios->c_cflag;
1373
1374         if (   (cflag == old_termios->c_cflag)
1375             && (   RELEVANT_IFLAG(tty->termios->c_iflag) 
1376                 == RELEVANT_IFLAG(old_termios->c_iflag)))
1377           return;
1378
1379         change_speed(info, old_termios);
1380
1381         /* Handle transition to B0 status */
1382         if ((old_termios->c_cflag & CBAUD) &&
1383             !(cflag & CBAUD)) {
1384                 info->MCR &= ~(SER_DTR|SER_RTS);
1385                 local_irq_save(flags);
1386                 rtsdtr_ctrl(info->MCR);
1387                 local_irq_restore(flags);
1388         }
1389
1390         /* Handle transition away from B0 status */
1391         if (!(old_termios->c_cflag & CBAUD) &&
1392             (cflag & CBAUD)) {
1393                 info->MCR |= SER_DTR;
1394                 if (!(tty->termios->c_cflag & CRTSCTS) || 
1395                     !test_bit(TTY_THROTTLED, &tty->flags)) {
1396                         info->MCR |= SER_RTS;
1397                 }
1398                 local_irq_save(flags);
1399                 rtsdtr_ctrl(info->MCR);
1400                 local_irq_restore(flags);
1401         }
1402
1403         /* Handle turning off CRTSCTS */
1404         if ((old_termios->c_cflag & CRTSCTS) &&
1405             !(tty->termios->c_cflag & CRTSCTS)) {
1406                 tty->hw_stopped = 0;
1407                 rs_start(tty);
1408         }
1409
1410 #if 0
1411         /*
1412          * No need to wake up processes in open wait, since they
1413          * sample the CLOCAL flag once, and don't recheck it.
1414          * XXX  It's not clear whether the current behavior is correct
1415          * or not.  Hence, this may change.....
1416          */
1417         if (!(old_termios->c_cflag & CLOCAL) &&
1418             (tty->termios->c_cflag & CLOCAL))
1419                 wake_up_interruptible(&info->open_wait);
1420 #endif
1421 }
1422
1423 /*
1424  * ------------------------------------------------------------
1425  * rs_close()
1426  * 
1427  * This routine is called when the serial port gets closed.  First, we
1428  * wait for the last remaining data to be sent.  Then, we unlink its
1429  * async structure from the interrupt chain if necessary, and we free
1430  * that IRQ if nothing is left in the chain.
1431  * ------------------------------------------------------------
1432  */
1433 static void rs_close(struct tty_struct *tty, struct file * filp)
1434 {
1435         struct async_struct * info = (struct async_struct *)tty->driver_data;
1436         struct serial_state *state;
1437         unsigned long flags;
1438
1439         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1440                 return;
1441
1442         state = info->state;
1443
1444         local_irq_save(flags);
1445
1446         if (tty_hung_up_p(filp)) {
1447                 DBG_CNT("before DEC-hung");
1448                 local_irq_restore(flags);
1449                 return;
1450         }
1451
1452 #ifdef SERIAL_DEBUG_OPEN
1453         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1454 #endif
1455         if ((tty->count == 1) && (state->count != 1)) {
1456                 /*
1457                  * Uh, oh.  tty->count is 1, which means that the tty
1458                  * structure will be freed.  state->count should always
1459                  * be one in these conditions.  If it's greater than
1460                  * one, we've got real problems, since it means the
1461                  * serial port won't be shutdown.
1462                  */
1463                 printk("rs_close: bad serial port count; tty->count is 1, "
1464                        "state->count is %d\n", state->count);
1465                 state->count = 1;
1466         }
1467         if (--state->count < 0) {
1468                 printk("rs_close: bad serial port count for ttys%d: %d\n",
1469                        info->line, state->count);
1470                 state->count = 0;
1471         }
1472         if (state->count) {
1473                 DBG_CNT("before DEC-2");
1474                 local_irq_restore(flags);
1475                 return;
1476         }
1477         info->flags |= ASYNC_CLOSING;
1478         /*
1479          * Now we wait for the transmit buffer to clear; and we notify 
1480          * the line discipline to only process XON/XOFF characters.
1481          */
1482         tty->closing = 1;
1483         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1484                 tty_wait_until_sent(tty, info->closing_wait);
1485         /*
1486          * At this point we stop accepting input.  To do this, we
1487          * disable the receive line status interrupts, and tell the
1488          * interrupt driver to stop checking the data ready bit in the
1489          * line status register.
1490          */
1491         info->read_status_mask &= ~UART_LSR_DR;
1492         if (info->flags & ASYNC_INITIALIZED) {
1493                 /* disable receive interrupts */
1494                 custom.intena = IF_RBF;
1495                 mb();
1496                 /* clear any pending receive interrupt */
1497                 custom.intreq = IF_RBF;
1498                 mb();
1499
1500                 /*
1501                  * Before we drop DTR, make sure the UART transmitter
1502                  * has completely drained; this is especially
1503                  * important if there is a transmit FIFO!
1504                  */
1505                 rs_wait_until_sent(tty, info->timeout);
1506         }
1507         shutdown(info);
1508         if (tty->driver->flush_buffer)
1509                 tty->driver->flush_buffer(tty);
1510                 
1511         tty_ldisc_flush(tty);
1512         tty->closing = 0;
1513         info->event = 0;
1514         info->tty = NULL;
1515         if (info->blocked_open) {
1516                 if (info->close_delay) {
1517                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1518                 }
1519                 wake_up_interruptible(&info->open_wait);
1520         }
1521         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1522         wake_up_interruptible(&info->close_wait);
1523         local_irq_restore(flags);
1524 }
1525
1526 /*
1527  * rs_wait_until_sent() --- wait until the transmitter is empty
1528  */
1529 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1530 {
1531         struct async_struct * info = (struct async_struct *)tty->driver_data;
1532         unsigned long orig_jiffies, char_time;
1533         int lsr;
1534
1535         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1536                 return;
1537
1538         if (info->xmit_fifo_size == 0)
1539                 return; /* Just in case.... */
1540
1541         orig_jiffies = jiffies;
1542         /*
1543          * Set the check interval to be 1/5 of the estimated time to
1544          * send a single character, and make it at least 1.  The check
1545          * interval should also be less than the timeout.
1546          * 
1547          * Note: we have to use pretty tight timings here to satisfy
1548          * the NIST-PCTS.
1549          */
1550         char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1551         char_time = char_time / 5;
1552         if (char_time == 0)
1553                 char_time = 1;
1554         if (timeout)
1555           char_time = min_t(unsigned long, char_time, timeout);
1556         /*
1557          * If the transmitter hasn't cleared in twice the approximate
1558          * amount of time to send the entire FIFO, it probably won't
1559          * ever clear.  This assumes the UART isn't doing flow
1560          * control, which is currently the case.  Hence, if it ever
1561          * takes longer than info->timeout, this is probably due to a
1562          * UART bug of some kind.  So, we clamp the timeout parameter at
1563          * 2*info->timeout.
1564          */
1565         if (!timeout || timeout > 2*info->timeout)
1566                 timeout = 2*info->timeout;
1567 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1568         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1569         printk("jiff=%lu...", jiffies);
1570 #endif
1571         while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1572 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1573                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1574 #endif
1575                 msleep_interruptible(jiffies_to_msecs(char_time));
1576                 if (signal_pending(current))
1577                         break;
1578                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1579                         break;
1580         }
1581         current->state = TASK_RUNNING;
1582 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1583         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1584 #endif
1585 }
1586
1587 /*
1588  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1589  */
1590 static void rs_hangup(struct tty_struct *tty)
1591 {
1592         struct async_struct * info = (struct async_struct *)tty->driver_data;
1593         struct serial_state *state = info->state;
1594
1595         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1596                 return;
1597
1598         state = info->state;
1599
1600         rs_flush_buffer(tty);
1601         shutdown(info);
1602         info->event = 0;
1603         state->count = 0;
1604         info->flags &= ~ASYNC_NORMAL_ACTIVE;
1605         info->tty = NULL;
1606         wake_up_interruptible(&info->open_wait);
1607 }
1608
1609 /*
1610  * ------------------------------------------------------------
1611  * rs_open() and friends
1612  * ------------------------------------------------------------
1613  */
1614 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1615                            struct async_struct *info)
1616 {
1617 #ifdef DECLARE_WAITQUEUE
1618         DECLARE_WAITQUEUE(wait, current);
1619 #else
1620         struct wait_queue wait = { current, NULL };
1621 #endif
1622         struct serial_state *state = info->state;
1623         int             retval;
1624         int             do_clocal = 0, extra_count = 0;
1625         unsigned long   flags;
1626
1627         /*
1628          * If the device is in the middle of being closed, then block
1629          * until it's done, and then try again.
1630          */
1631         if (tty_hung_up_p(filp) ||
1632             (info->flags & ASYNC_CLOSING)) {
1633                 if (info->flags & ASYNC_CLOSING)
1634                         interruptible_sleep_on(&info->close_wait);
1635 #ifdef SERIAL_DO_RESTART
1636                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1637                         -EAGAIN : -ERESTARTSYS);
1638 #else
1639                 return -EAGAIN;
1640 #endif
1641         }
1642
1643         /*
1644          * If non-blocking mode is set, or the port is not enabled,
1645          * then make the check up front and then exit.
1646          */
1647         if ((filp->f_flags & O_NONBLOCK) ||
1648             (tty->flags & (1 << TTY_IO_ERROR))) {
1649                 info->flags |= ASYNC_NORMAL_ACTIVE;
1650                 return 0;
1651         }
1652
1653         if (tty->termios->c_cflag & CLOCAL)
1654                 do_clocal = 1;
1655
1656         /*
1657          * Block waiting for the carrier detect and the line to become
1658          * free (i.e., not in use by the callout).  While we are in
1659          * this loop, state->count is dropped by one, so that
1660          * rs_close() knows when to free things.  We restore it upon
1661          * exit, either normal or abnormal.
1662          */
1663         retval = 0;
1664         add_wait_queue(&info->open_wait, &wait);
1665 #ifdef SERIAL_DEBUG_OPEN
1666         printk("block_til_ready before block: ttys%d, count = %d\n",
1667                state->line, state->count);
1668 #endif
1669         local_irq_save(flags);
1670         if (!tty_hung_up_p(filp)) {
1671                 extra_count = 1;
1672                 state->count--;
1673         }
1674         local_irq_restore(flags);
1675         info->blocked_open++;
1676         while (1) {
1677                 local_irq_save(flags);
1678                 if (tty->termios->c_cflag & CBAUD)
1679                         rtsdtr_ctrl(SER_DTR|SER_RTS);
1680                 local_irq_restore(flags);
1681                 set_current_state(TASK_INTERRUPTIBLE);
1682                 if (tty_hung_up_p(filp) ||
1683                     !(info->flags & ASYNC_INITIALIZED)) {
1684 #ifdef SERIAL_DO_RESTART
1685                         if (info->flags & ASYNC_HUP_NOTIFY)
1686                                 retval = -EAGAIN;
1687                         else
1688                                 retval = -ERESTARTSYS;
1689 #else
1690                         retval = -EAGAIN;
1691 #endif
1692                         break;
1693                 }
1694                 if (!(info->flags & ASYNC_CLOSING) &&
1695                     (do_clocal || (!(ciab.pra & SER_DCD)) ))
1696                         break;
1697                 if (signal_pending(current)) {
1698                         retval = -ERESTARTSYS;
1699                         break;
1700                 }
1701 #ifdef SERIAL_DEBUG_OPEN
1702                 printk("block_til_ready blocking: ttys%d, count = %d\n",
1703                        info->line, state->count);
1704 #endif
1705                 schedule();
1706         }
1707         current->state = TASK_RUNNING;
1708         remove_wait_queue(&info->open_wait, &wait);
1709         if (extra_count)
1710                 state->count++;
1711         info->blocked_open--;
1712 #ifdef SERIAL_DEBUG_OPEN
1713         printk("block_til_ready after blocking: ttys%d, count = %d\n",
1714                info->line, state->count);
1715 #endif
1716         if (retval)
1717                 return retval;
1718         info->flags |= ASYNC_NORMAL_ACTIVE;
1719         return 0;
1720 }
1721
1722 static int get_async_struct(int line, struct async_struct **ret_info)
1723 {
1724         struct async_struct *info;
1725         struct serial_state *sstate;
1726
1727         sstate = rs_table + line;
1728         sstate->count++;
1729         if (sstate->info) {
1730                 *ret_info = sstate->info;
1731                 return 0;
1732         }
1733         info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
1734         if (!info) {
1735                 sstate->count--;
1736                 return -ENOMEM;
1737         }
1738         memset(info, 0, sizeof(struct async_struct));
1739 #ifdef DECLARE_WAITQUEUE
1740         init_waitqueue_head(&info->open_wait);
1741         init_waitqueue_head(&info->close_wait);
1742         init_waitqueue_head(&info->delta_msr_wait);
1743 #endif
1744         info->magic = SERIAL_MAGIC;
1745         info->port = sstate->port;
1746         info->flags = sstate->flags;
1747         info->xmit_fifo_size = sstate->xmit_fifo_size;
1748         info->line = line;
1749         tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1750         info->state = sstate;
1751         if (sstate->info) {
1752                 kfree(info);
1753                 *ret_info = sstate->info;
1754                 return 0;
1755         }
1756         *ret_info = sstate->info = info;
1757         return 0;
1758 }
1759
1760 /*
1761  * This routine is called whenever a serial port is opened.  It
1762  * enables interrupts for a serial port, linking in its async structure into
1763  * the IRQ chain.   It also performs the serial-specific
1764  * initialization for the tty structure.
1765  */
1766 static int rs_open(struct tty_struct *tty, struct file * filp)
1767 {
1768         struct async_struct     *info;
1769         int                     retval, line;
1770
1771         line = tty->index;
1772         if ((line < 0) || (line >= NR_PORTS)) {
1773                 return -ENODEV;
1774         }
1775         retval = get_async_struct(line, &info);
1776         if (retval) {
1777                 return retval;
1778         }
1779         tty->driver_data = info;
1780         info->tty = tty;
1781         if (serial_paranoia_check(info, tty->name, "rs_open"))
1782                 return -ENODEV;
1783
1784 #ifdef SERIAL_DEBUG_OPEN
1785         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1786 #endif
1787         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1788
1789         /*
1790          * If the port is the middle of closing, bail out now
1791          */
1792         if (tty_hung_up_p(filp) ||
1793             (info->flags & ASYNC_CLOSING)) {
1794                 if (info->flags & ASYNC_CLOSING)
1795                         interruptible_sleep_on(&info->close_wait);
1796 #ifdef SERIAL_DO_RESTART
1797                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1798                         -EAGAIN : -ERESTARTSYS);
1799 #else
1800                 return -EAGAIN;
1801 #endif
1802         }
1803
1804         /*
1805          * Start up serial port
1806          */
1807         retval = startup(info);
1808         if (retval) {
1809                 return retval;
1810         }
1811
1812         retval = block_til_ready(tty, filp, info);
1813         if (retval) {
1814 #ifdef SERIAL_DEBUG_OPEN
1815                 printk("rs_open returning after block_til_ready with %d\n",
1816                        retval);
1817 #endif
1818                 return retval;
1819         }
1820
1821 #ifdef SERIAL_DEBUG_OPEN
1822         printk("rs_open %s successful...", tty->name);
1823 #endif
1824         return 0;
1825 }
1826
1827 /*
1828  * /proc fs routines....
1829  */
1830
1831 static inline int line_info(char *buf, struct serial_state *state)
1832 {
1833         struct async_struct *info = state->info, scr_info;
1834         char    stat_buf[30], control, status;
1835         int     ret;
1836         unsigned long flags;
1837
1838         ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1839
1840         /*
1841          * Figure out the current RS-232 lines
1842          */
1843         if (!info) {
1844                 info = &scr_info;       /* This is just for serial_{in,out} */
1845
1846                 info->magic = SERIAL_MAGIC;
1847                 info->flags = state->flags;
1848                 info->quot = 0;
1849                 info->tty = NULL;
1850         }
1851         local_irq_save(flags);
1852         status = ciab.pra;
1853         control = info ? info->MCR : status;
1854         local_irq_restore(flags);
1855
1856         stat_buf[0] = 0;
1857         stat_buf[1] = 0;
1858         if(!(control & SER_RTS))
1859                 strcat(stat_buf, "|RTS");
1860         if(!(status & SER_CTS))
1861                 strcat(stat_buf, "|CTS");
1862         if(!(control & SER_DTR))
1863                 strcat(stat_buf, "|DTR");
1864         if(!(status & SER_DSR))
1865                 strcat(stat_buf, "|DSR");
1866         if(!(status & SER_DCD))
1867                 strcat(stat_buf, "|CD");
1868
1869         if (info->quot) {
1870                 ret += sprintf(buf+ret, " baud:%d",
1871                                state->baud_base / info->quot);
1872         }
1873
1874         ret += sprintf(buf+ret, " tx:%d rx:%d",
1875                       state->icount.tx, state->icount.rx);
1876
1877         if (state->icount.frame)
1878                 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1879
1880         if (state->icount.parity)
1881                 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1882
1883         if (state->icount.brk)
1884                 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1885
1886         if (state->icount.overrun)
1887                 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1888
1889         /*
1890          * Last thing is the RS-232 status lines
1891          */
1892         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1893         return ret;
1894 }
1895
1896 static int rs_read_proc(char *page, char **start, off_t off, int count,
1897                         int *eof, void *data)
1898 {
1899         int len = 0, l;
1900         off_t   begin = 0;
1901
1902         len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1903         l = line_info(page + len, &rs_table[0]);
1904         len += l;
1905         if (len+begin > off+count)
1906           goto done;
1907         if (len+begin < off) {
1908           begin += len;
1909           len = 0;
1910         }
1911         *eof = 1;
1912 done:
1913         if (off >= len+begin)
1914                 return 0;
1915         *start = page + (off-begin);
1916         return ((count < begin+len-off) ? count : begin+len-off);
1917 }
1918
1919 /*
1920  * ---------------------------------------------------------------------
1921  * rs_init() and friends
1922  *
1923  * rs_init() is called at boot-time to initialize the serial driver.
1924  * ---------------------------------------------------------------------
1925  */
1926
1927 /*
1928  * This routine prints out the appropriate serial driver version
1929  * number, and identifies which options were configured into this
1930  * driver.
1931  */
1932 static void show_serial_version(void)
1933 {
1934         printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1935 }
1936
1937
1938 static const struct tty_operations serial_ops = {
1939         .open = rs_open,
1940         .close = rs_close,
1941         .write = rs_write,
1942         .put_char = rs_put_char,
1943         .flush_chars = rs_flush_chars,
1944         .write_room = rs_write_room,
1945         .chars_in_buffer = rs_chars_in_buffer,
1946         .flush_buffer = rs_flush_buffer,
1947         .ioctl = rs_ioctl,
1948         .throttle = rs_throttle,
1949         .unthrottle = rs_unthrottle,
1950         .set_termios = rs_set_termios,
1951         .stop = rs_stop,
1952         .start = rs_start,
1953         .hangup = rs_hangup,
1954         .break_ctl = rs_break,
1955         .send_xchar = rs_send_xchar,
1956         .wait_until_sent = rs_wait_until_sent,
1957         .read_proc = rs_read_proc,
1958         .tiocmget = rs_tiocmget,
1959         .tiocmset = rs_tiocmset,
1960 };
1961
1962 /*
1963  * The serial driver boot-time initialization code!
1964  */
1965 static int __init rs_init(void)
1966 {
1967         unsigned long flags;
1968         struct serial_state * state;
1969
1970         if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
1971                 return -ENODEV;
1972
1973         serial_driver = alloc_tty_driver(1);
1974         if (!serial_driver)
1975                 return -ENOMEM;
1976
1977         /*
1978          *  We request SERDAT and SERPER only, because the serial registers are
1979          *  too spreaded over the custom register space
1980          */
1981         if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
1982                 return -EBUSY;
1983
1984         IRQ_ports = NULL;
1985
1986         show_serial_version();
1987
1988         /* Initialize the tty_driver structure */
1989
1990         serial_driver->owner = THIS_MODULE;
1991         serial_driver->driver_name = "amiserial";
1992         serial_driver->name = "ttyS";
1993         serial_driver->major = TTY_MAJOR;
1994         serial_driver->minor_start = 64;
1995         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1996         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1997         serial_driver->init_termios = tty_std_termios;
1998         serial_driver->init_termios.c_cflag =
1999                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2000         serial_driver->flags = TTY_DRIVER_REAL_RAW;
2001         tty_set_operations(serial_driver, &serial_ops);
2002
2003         if (tty_register_driver(serial_driver))
2004                 panic("Couldn't register serial driver\n");
2005
2006         state = rs_table;
2007         state->magic = SSTATE_MAGIC;
2008         state->port = (int)&custom.serdatr; /* Just to give it a value */
2009         state->line = 0;
2010         state->custom_divisor = 0;
2011         state->close_delay = 5*HZ/10;
2012         state->closing_wait = 30*HZ;
2013         state->icount.cts = state->icount.dsr = 
2014           state->icount.rng = state->icount.dcd = 0;
2015         state->icount.rx = state->icount.tx = 0;
2016         state->icount.frame = state->icount.parity = 0;
2017         state->icount.overrun = state->icount.brk = 0;
2018
2019         printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2020                        state->line);
2021
2022         /* Hardware set up */
2023
2024         state->baud_base = amiga_colorclock;
2025         state->xmit_fifo_size = 1;
2026
2027         local_irq_save(flags);
2028
2029         /* set ISRs, and then disable the rx interrupts */
2030         request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2031         request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, "serial RX", state);
2032
2033         /* turn off Rx and Tx interrupts */
2034         custom.intena = IF_RBF | IF_TBE;
2035         mb();
2036
2037         /* clear any pending interrupt */
2038         custom.intreq = IF_RBF | IF_TBE;
2039         mb();
2040
2041         local_irq_restore(flags);
2042
2043         /*
2044          * set the appropriate directions for the modem control flags,
2045          * and clear RTS and DTR
2046          */
2047         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
2048         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
2049
2050         return 0;
2051 }
2052
2053 static __exit void rs_exit(void) 
2054 {
2055         int error;
2056         struct async_struct *info = rs_table[0].info;
2057
2058         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2059         tasklet_kill(&info->tlet);
2060         if ((error = tty_unregister_driver(serial_driver)))
2061                 printk("SERIAL: failed to unregister serial driver (%d)\n",
2062                        error);
2063         put_tty_driver(serial_driver);
2064
2065         if (info) {
2066           rs_table[0].info = NULL;
2067           kfree(info);
2068         }
2069
2070         release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2071 }
2072
2073 module_init(rs_init)
2074 module_exit(rs_exit)
2075
2076
2077 /*
2078  * ------------------------------------------------------------
2079  * Serial console driver
2080  * ------------------------------------------------------------
2081  */
2082 #ifdef CONFIG_SERIAL_CONSOLE
2083
2084 static void amiga_serial_putc(char c)
2085 {
2086         custom.serdat = (unsigned char)c | 0x100;
2087         while (!(custom.serdatr & 0x2000))
2088                 barrier();
2089 }
2090
2091 /*
2092  *      Print a string to the serial port trying not to disturb
2093  *      any possible real use of the port...
2094  *
2095  *      The console must be locked when we get here.
2096  */
2097 static void serial_console_write(struct console *co, const char *s,
2098                                 unsigned count)
2099 {
2100         unsigned short intena = custom.intenar;
2101
2102         custom.intena = IF_TBE;
2103
2104         while (count--) {
2105                 if (*s == '\n')
2106                         amiga_serial_putc('\r');
2107                 amiga_serial_putc(*s++);
2108         }
2109
2110         custom.intena = IF_SETCLR | (intena & IF_TBE);
2111 }
2112
2113 static struct tty_driver *serial_console_device(struct console *c, int *index)
2114 {
2115         *index = 0;
2116         return serial_driver;
2117 }
2118
2119 static struct console sercons = {
2120         .name =         "ttyS",
2121         .write =        serial_console_write,
2122         .device =       serial_console_device,
2123         .flags =        CON_PRINTBUFFER,
2124         .index =        -1,
2125 };
2126
2127 /*
2128  *      Register console.
2129  */
2130 static int __init amiserial_console_init(void)
2131 {
2132         register_console(&sercons);
2133         return 0;
2134 }
2135 console_initcall(amiserial_console_init);
2136 #endif
2137
2138 MODULE_LICENSE("GPL");