Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / 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 }
533
534 /*
535  * ---------------------------------------------------------------
536  * Low level utility subroutines for the serial driver:  routines to
537  * figure out the appropriate timeout for an interrupt chain, routines
538  * to initialize and startup a serial port, and routines to shutdown a
539  * serial port.  Useful stuff like that.
540  * ---------------------------------------------------------------
541  */
542
543 static int startup(struct async_struct * info)
544 {
545         unsigned long flags;
546         int     retval=0;
547         unsigned long page;
548
549         page = get_zeroed_page(GFP_KERNEL);
550         if (!page)
551                 return -ENOMEM;
552
553         local_irq_save(flags);
554
555         if (info->flags & ASYNC_INITIALIZED) {
556                 free_page(page);
557                 goto errout;
558         }
559
560         if (info->xmit.buf)
561                 free_page(page);
562         else
563                 info->xmit.buf = (unsigned char *) page;
564
565 #ifdef SERIAL_DEBUG_OPEN
566         printk("starting up ttys%d ...", info->line);
567 #endif
568
569         /* Clear anything in the input buffer */
570
571         custom.intreq = IF_RBF;
572         mb();
573
574         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
575         if (retval) {
576           if (serial_isroot()) {
577             if (info->tty)
578               set_bit(TTY_IO_ERROR,
579                       &info->tty->flags);
580             retval = 0;
581           }
582           goto errout;
583         }
584
585         /* enable both Rx and Tx interrupts */
586         custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
587         mb();
588         info->IER = UART_IER_MSI;
589
590         /* remember current state of the DCD and CTS bits */
591         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
592
593         IRQ_ports = info;
594
595         info->MCR = 0;
596         if (info->tty->termios->c_cflag & CBAUD)
597           info->MCR = SER_DTR | SER_RTS;
598         rtsdtr_ctrl(info->MCR);
599
600         if (info->tty)
601                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
602         info->xmit.head = info->xmit.tail = 0;
603
604         /*
605          * Set up the tty->alt_speed kludge
606          */
607         if (info->tty) {
608                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
609                         info->tty->alt_speed = 57600;
610                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
611                         info->tty->alt_speed = 115200;
612                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
613                         info->tty->alt_speed = 230400;
614                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
615                         info->tty->alt_speed = 460800;
616         }
617
618         /*
619          * and set the speed of the serial port
620          */
621         change_speed(info, NULL);
622
623         info->flags |= ASYNC_INITIALIZED;
624         local_irq_restore(flags);
625         return 0;
626
627 errout:
628         local_irq_restore(flags);
629         return retval;
630 }
631
632 /*
633  * This routine will shutdown a serial port; interrupts are disabled, and
634  * DTR is dropped if the hangup on close termio flag is on.
635  */
636 static void shutdown(struct async_struct * info)
637 {
638         unsigned long   flags;
639         struct serial_state *state;
640
641         if (!(info->flags & ASYNC_INITIALIZED))
642                 return;
643
644         state = info->state;
645
646 #ifdef SERIAL_DEBUG_OPEN
647         printk("Shutting down serial port %d ....\n", info->line);
648 #endif
649
650         local_irq_save(flags); /* Disable interrupts */
651
652         /*
653          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
654          * here so the queue might never be waken up
655          */
656         wake_up_interruptible(&info->delta_msr_wait);
657
658         IRQ_ports = NULL;
659
660         /*
661          * Free the IRQ, if necessary
662          */
663         free_irq(IRQ_AMIGA_VERTB, info);
664
665         if (info->xmit.buf) {
666                 free_page((unsigned long) info->xmit.buf);
667                 info->xmit.buf = NULL;
668         }
669
670         info->IER = 0;
671         custom.intena = IF_RBF | IF_TBE;
672         mb();
673
674         /* disable break condition */
675         custom.adkcon = AC_UARTBRK;
676         mb();
677
678         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
679                 info->MCR &= ~(SER_DTR|SER_RTS);
680         rtsdtr_ctrl(info->MCR);
681
682         if (info->tty)
683                 set_bit(TTY_IO_ERROR, &info->tty->flags);
684
685         info->flags &= ~ASYNC_INITIALIZED;
686         local_irq_restore(flags);
687 }
688
689
690 /*
691  * This routine is called to set the UART divisor registers to match
692  * the specified baud rate for a serial port.
693  */
694 static void change_speed(struct async_struct *info,
695                          struct ktermios *old_termios)
696 {
697         int     quot = 0, baud_base, baud;
698         unsigned cflag, cval = 0;
699         int     bits;
700         unsigned long   flags;
701
702         if (!info->tty || !info->tty->termios)
703                 return;
704         cflag = info->tty->termios->c_cflag;
705
706         /* Byte size is always 8 bits plus parity bit if requested */
707
708         cval = 3; bits = 10;
709         if (cflag & CSTOPB) {
710                 cval |= 0x04;
711                 bits++;
712         }
713         if (cflag & PARENB) {
714                 cval |= UART_LCR_PARITY;
715                 bits++;
716         }
717         if (!(cflag & PARODD))
718                 cval |= UART_LCR_EPAR;
719 #ifdef CMSPAR
720         if (cflag & CMSPAR)
721                 cval |= UART_LCR_SPAR;
722 #endif
723
724         /* Determine divisor based on baud rate */
725         baud = tty_get_baud_rate(info->tty);
726         if (!baud)
727                 baud = 9600;    /* B0 transition handled in rs_set_termios */
728         baud_base = info->state->baud_base;
729         if (baud == 38400 &&
730             ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
731                 quot = info->state->custom_divisor;
732         else {
733                 if (baud == 134)
734                         /* Special case since 134 is really 134.5 */
735                         quot = (2*baud_base / 269);
736                 else if (baud)
737                         quot = baud_base / baud;
738         }
739         /* If the quotient is zero refuse the change */
740         if (!quot && old_termios) {
741                 /* FIXME: Will need updating for new tty in the end */
742                 info->tty->termios->c_cflag &= ~CBAUD;
743                 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
744                 baud = tty_get_baud_rate(info->tty);
745                 if (!baud)
746                         baud = 9600;
747                 if (baud == 38400 &&
748                     ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
749                         quot = info->state->custom_divisor;
750                 else {
751                         if (baud == 134)
752                                 /* Special case since 134 is really 134.5 */
753                                 quot = (2*baud_base / 269);
754                         else if (baud)
755                                 quot = baud_base / baud;
756                 }
757         }
758         /* As a last resort, if the quotient is zero, default to 9600 bps */
759         if (!quot)
760                 quot = baud_base / 9600;
761         info->quot = quot;
762         info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
763         info->timeout += HZ/50;         /* Add .02 seconds of slop */
764
765         /* CTS flow control flag and modem status interrupts */
766         info->IER &= ~UART_IER_MSI;
767         if (info->flags & ASYNC_HARDPPS_CD)
768                 info->IER |= UART_IER_MSI;
769         if (cflag & CRTSCTS) {
770                 info->flags |= ASYNC_CTS_FLOW;
771                 info->IER |= UART_IER_MSI;
772         } else
773                 info->flags &= ~ASYNC_CTS_FLOW;
774         if (cflag & CLOCAL)
775                 info->flags &= ~ASYNC_CHECK_CD;
776         else {
777                 info->flags |= ASYNC_CHECK_CD;
778                 info->IER |= UART_IER_MSI;
779         }
780         /* TBD:
781          * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
782          */
783
784         /*
785          * Set up parity check flag
786          */
787
788         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
789         if (I_INPCK(info->tty))
790                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
791         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
792                 info->read_status_mask |= UART_LSR_BI;
793
794         /*
795          * Characters to ignore
796          */
797         info->ignore_status_mask = 0;
798         if (I_IGNPAR(info->tty))
799                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
800         if (I_IGNBRK(info->tty)) {
801                 info->ignore_status_mask |= UART_LSR_BI;
802                 /*
803                  * If we're ignore parity and break indicators, ignore 
804                  * overruns too.  (For real raw support).
805                  */
806                 if (I_IGNPAR(info->tty))
807                         info->ignore_status_mask |= UART_LSR_OE;
808         }
809         /*
810          * !!! ignore all characters if CREAD is not set
811          */
812         if ((cflag & CREAD) == 0)
813                 info->ignore_status_mask |= UART_LSR_DR;
814         local_irq_save(flags);
815
816         {
817           short serper;
818
819         /* Set up the baud rate */
820           serper = quot - 1;
821
822         /* Enable or disable parity bit */
823
824         if(cval & UART_LCR_PARITY)
825           serper |= (SERPER_PARENB);
826
827         custom.serper = serper;
828         mb();
829         }
830
831         info->LCR = cval;                               /* Save LCR */
832         local_irq_restore(flags);
833 }
834
835 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
836 {
837         struct async_struct *info;
838         unsigned long flags;
839
840         info = tty->driver_data;
841
842         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
843                 return 0;
844
845         if (!info->xmit.buf)
846                 return 0;
847
848         local_irq_save(flags);
849         if (CIRC_SPACE(info->xmit.head,
850                        info->xmit.tail,
851                        SERIAL_XMIT_SIZE) == 0) {
852                 local_irq_restore(flags);
853                 return 0;
854         }
855
856         info->xmit.buf[info->xmit.head++] = ch;
857         info->xmit.head &= SERIAL_XMIT_SIZE-1;
858         local_irq_restore(flags);
859         return 1;
860 }
861
862 static void rs_flush_chars(struct tty_struct *tty)
863 {
864         struct async_struct *info = (struct async_struct *)tty->driver_data;
865         unsigned long flags;
866
867         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
868                 return;
869
870         if (info->xmit.head == info->xmit.tail
871             || tty->stopped
872             || tty->hw_stopped
873             || !info->xmit.buf)
874                 return;
875
876         local_irq_save(flags);
877         info->IER |= UART_IER_THRI;
878         custom.intena = IF_SETCLR | IF_TBE;
879         mb();
880         /* set a pending Tx Interrupt, transmitter should restart now */
881         custom.intreq = IF_SETCLR | IF_TBE;
882         mb();
883         local_irq_restore(flags);
884 }
885
886 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
887 {
888         int     c, ret = 0;
889         struct async_struct *info;
890         unsigned long flags;
891
892         info = tty->driver_data;
893
894         if (serial_paranoia_check(info, tty->name, "rs_write"))
895                 return 0;
896
897         if (!info->xmit.buf)
898                 return 0;
899
900         local_irq_save(flags);
901         while (1) {
902                 c = CIRC_SPACE_TO_END(info->xmit.head,
903                                       info->xmit.tail,
904                                       SERIAL_XMIT_SIZE);
905                 if (count < c)
906                         c = count;
907                 if (c <= 0) {
908                         break;
909                 }
910                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
911                 info->xmit.head = ((info->xmit.head + c) &
912                                    (SERIAL_XMIT_SIZE-1));
913                 buf += c;
914                 count -= c;
915                 ret += c;
916         }
917         local_irq_restore(flags);
918
919         if (info->xmit.head != info->xmit.tail
920             && !tty->stopped
921             && !tty->hw_stopped
922             && !(info->IER & UART_IER_THRI)) {
923                 info->IER |= UART_IER_THRI;
924                 local_irq_disable();
925                 custom.intena = IF_SETCLR | IF_TBE;
926                 mb();
927                 /* set a pending Tx Interrupt, transmitter should restart now */
928                 custom.intreq = IF_SETCLR | IF_TBE;
929                 mb();
930                 local_irq_restore(flags);
931         }
932         return ret;
933 }
934
935 static int rs_write_room(struct tty_struct *tty)
936 {
937         struct async_struct *info = (struct async_struct *)tty->driver_data;
938
939         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
940                 return 0;
941         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
942 }
943
944 static int rs_chars_in_buffer(struct tty_struct *tty)
945 {
946         struct async_struct *info = (struct async_struct *)tty->driver_data;
947
948         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
949                 return 0;
950         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
951 }
952
953 static void rs_flush_buffer(struct tty_struct *tty)
954 {
955         struct async_struct *info = (struct async_struct *)tty->driver_data;
956         unsigned long flags;
957
958         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
959                 return;
960         local_irq_save(flags);
961         info->xmit.head = info->xmit.tail = 0;
962         local_irq_restore(flags);
963         tty_wakeup(tty);
964 }
965
966 /*
967  * This function is used to send a high-priority XON/XOFF character to
968  * the device
969  */
970 static void rs_send_xchar(struct tty_struct *tty, char ch)
971 {
972         struct async_struct *info = (struct async_struct *)tty->driver_data;
973         unsigned long flags;
974
975         if (serial_paranoia_check(info, tty->name, "rs_send_char"))
976                 return;
977
978         info->x_char = ch;
979         if (ch) {
980                 /* Make sure transmit interrupts are on */
981
982                 /* Check this ! */
983                 local_irq_save(flags);
984                 if(!(custom.intenar & IF_TBE)) {
985                     custom.intena = IF_SETCLR | IF_TBE;
986                     mb();
987                     /* set a pending Tx Interrupt, transmitter should restart now */
988                     custom.intreq = IF_SETCLR | IF_TBE;
989                     mb();
990                 }
991                 local_irq_restore(flags);
992
993                 info->IER |= UART_IER_THRI;
994         }
995 }
996
997 /*
998  * ------------------------------------------------------------
999  * rs_throttle()
1000  * 
1001  * This routine is called by the upper-layer tty layer to signal that
1002  * incoming characters should be throttled.
1003  * ------------------------------------------------------------
1004  */
1005 static void rs_throttle(struct tty_struct * tty)
1006 {
1007         struct async_struct *info = (struct async_struct *)tty->driver_data;
1008         unsigned long flags;
1009 #ifdef SERIAL_DEBUG_THROTTLE
1010         char    buf[64];
1011
1012         printk("throttle %s: %d....\n", tty_name(tty, buf),
1013                tty->ldisc.chars_in_buffer(tty));
1014 #endif
1015
1016         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1017                 return;
1018
1019         if (I_IXOFF(tty))
1020                 rs_send_xchar(tty, STOP_CHAR(tty));
1021
1022         if (tty->termios->c_cflag & CRTSCTS)
1023                 info->MCR &= ~SER_RTS;
1024
1025         local_irq_save(flags);
1026         rtsdtr_ctrl(info->MCR);
1027         local_irq_restore(flags);
1028 }
1029
1030 static void rs_unthrottle(struct tty_struct * tty)
1031 {
1032         struct async_struct *info = (struct async_struct *)tty->driver_data;
1033         unsigned long flags;
1034 #ifdef SERIAL_DEBUG_THROTTLE
1035         char    buf[64];
1036
1037         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1038                tty->ldisc.chars_in_buffer(tty));
1039 #endif
1040
1041         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1042                 return;
1043
1044         if (I_IXOFF(tty)) {
1045                 if (info->x_char)
1046                         info->x_char = 0;
1047                 else
1048                         rs_send_xchar(tty, START_CHAR(tty));
1049         }
1050         if (tty->termios->c_cflag & CRTSCTS)
1051                 info->MCR |= SER_RTS;
1052         local_irq_save(flags);
1053         rtsdtr_ctrl(info->MCR);
1054         local_irq_restore(flags);
1055 }
1056
1057 /*
1058  * ------------------------------------------------------------
1059  * rs_ioctl() and friends
1060  * ------------------------------------------------------------
1061  */
1062
1063 static int get_serial_info(struct async_struct * info,
1064                            struct serial_struct __user * retinfo)
1065 {
1066         struct serial_struct tmp;
1067         struct serial_state *state = info->state;
1068    
1069         if (!retinfo)
1070                 return -EFAULT;
1071         memset(&tmp, 0, sizeof(tmp));
1072         lock_kernel();
1073         tmp.type = state->type;
1074         tmp.line = state->line;
1075         tmp.port = state->port;
1076         tmp.irq = state->irq;
1077         tmp.flags = state->flags;
1078         tmp.xmit_fifo_size = state->xmit_fifo_size;
1079         tmp.baud_base = state->baud_base;
1080         tmp.close_delay = state->close_delay;
1081         tmp.closing_wait = state->closing_wait;
1082         tmp.custom_divisor = state->custom_divisor;
1083         unlock_kernel();
1084         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1085                 return -EFAULT;
1086         return 0;
1087 }
1088
1089 static int set_serial_info(struct async_struct * info,
1090                            struct serial_struct __user * new_info)
1091 {
1092         struct serial_struct new_serial;
1093         struct serial_state old_state, *state;
1094         unsigned int            change_irq,change_port;
1095         int                     retval = 0;
1096
1097         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1098                 return -EFAULT;
1099
1100         lock_kernel();
1101         state = info->state;
1102         old_state = *state;
1103   
1104         change_irq = new_serial.irq != state->irq;
1105         change_port = (new_serial.port != state->port);
1106         if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
1107           unlock_kernel();
1108           return -EINVAL;
1109         }
1110   
1111         if (!serial_isroot()) {
1112                 if ((new_serial.baud_base != state->baud_base) ||
1113                     (new_serial.close_delay != state->close_delay) ||
1114                     (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1115                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1116                      (state->flags & ~ASYNC_USR_MASK)))
1117                         return -EPERM;
1118                 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1119                                (new_serial.flags & ASYNC_USR_MASK));
1120                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1121                                (new_serial.flags & ASYNC_USR_MASK));
1122                 state->custom_divisor = new_serial.custom_divisor;
1123                 goto check_and_exit;
1124         }
1125
1126         if (new_serial.baud_base < 9600) {
1127                 unlock_kernel();
1128                 return -EINVAL;
1129         }
1130
1131         /*
1132          * OK, past this point, all the error checking has been done.
1133          * At this point, we start making changes.....
1134          */
1135
1136         state->baud_base = new_serial.baud_base;
1137         state->flags = ((state->flags & ~ASYNC_FLAGS) |
1138                         (new_serial.flags & ASYNC_FLAGS));
1139         info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1140                        (info->flags & ASYNC_INTERNAL_FLAGS));
1141         state->custom_divisor = new_serial.custom_divisor;
1142         state->close_delay = new_serial.close_delay * HZ/100;
1143         state->closing_wait = new_serial.closing_wait * HZ/100;
1144         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1145
1146 check_and_exit:
1147         if (info->flags & ASYNC_INITIALIZED) {
1148                 if (((old_state.flags & ASYNC_SPD_MASK) !=
1149                      (state->flags & ASYNC_SPD_MASK)) ||
1150                     (old_state.custom_divisor != state->custom_divisor)) {
1151                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1152                                 info->tty->alt_speed = 57600;
1153                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1154                                 info->tty->alt_speed = 115200;
1155                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1156                                 info->tty->alt_speed = 230400;
1157                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1158                                 info->tty->alt_speed = 460800;
1159                         change_speed(info, NULL);
1160                 }
1161         } else
1162                 retval = startup(info);
1163         unlock_kernel();
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 int 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 -EINVAL;
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         return 0;
1261 }
1262
1263
1264 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1265                     unsigned int cmd, unsigned long arg)
1266 {
1267         struct async_struct * info = (struct async_struct *)tty->driver_data;
1268         struct async_icount cprev, cnow;        /* kernel counter temps */
1269         struct serial_icounter_struct icount;
1270         void __user *argp = (void __user *)arg;
1271         unsigned long flags;
1272
1273         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1274                 return -ENODEV;
1275
1276         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1277             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1278             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1279                 if (tty->flags & (1 << TTY_IO_ERROR))
1280                     return -EIO;
1281         }
1282
1283         switch (cmd) {
1284                 case TIOCGSERIAL:
1285                         return get_serial_info(info, argp);
1286                 case TIOCSSERIAL:
1287                         return set_serial_info(info, argp);
1288                 case TIOCSERCONFIG:
1289                         return 0;
1290
1291                 case TIOCSERGETLSR: /* Get line status register */
1292                         return get_lsr_info(info, argp);
1293
1294                 case TIOCSERGSTRUCT:
1295                         if (copy_to_user(argp,
1296                                          info, sizeof(struct async_struct)))
1297                                 return -EFAULT;
1298                         return 0;
1299
1300                 /*
1301                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1302                  * - mask passed in arg for lines of interest
1303                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1304                  * Caller should use TIOCGICOUNT to see which one it was
1305                  */
1306                 case TIOCMIWAIT:
1307                         local_irq_save(flags);
1308                         /* note the counters on entry */
1309                         cprev = info->state->icount;
1310                         local_irq_restore(flags);
1311                         while (1) {
1312                                 interruptible_sleep_on(&info->delta_msr_wait);
1313                                 /* see if a signal did it */
1314                                 if (signal_pending(current))
1315                                         return -ERESTARTSYS;
1316                                 local_irq_save(flags);
1317                                 cnow = info->state->icount; /* atomic copy */
1318                                 local_irq_restore(flags);
1319                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 
1320                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1321                                         return -EIO; /* no change => error */
1322                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1323                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1324                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1325                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1326                                         return 0;
1327                                 }
1328                                 cprev = cnow;
1329                         }
1330                         /* NOTREACHED */
1331
1332                 /* 
1333                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1334                  * Return: write counters to the user passed counter struct
1335                  * NB: both 1->0 and 0->1 transitions are counted except for
1336                  *     RI where only 0->1 is counted.
1337                  */
1338                 case TIOCGICOUNT:
1339                         local_irq_save(flags);
1340                         cnow = info->state->icount;
1341                         local_irq_restore(flags);
1342                         icount.cts = cnow.cts;
1343                         icount.dsr = cnow.dsr;
1344                         icount.rng = cnow.rng;
1345                         icount.dcd = cnow.dcd;
1346                         icount.rx = cnow.rx;
1347                         icount.tx = cnow.tx;
1348                         icount.frame = cnow.frame;
1349                         icount.overrun = cnow.overrun;
1350                         icount.parity = cnow.parity;
1351                         icount.brk = cnow.brk;
1352                         icount.buf_overrun = cnow.buf_overrun;
1353
1354                         if (copy_to_user(argp, &icount, sizeof(icount)))
1355                                 return -EFAULT;
1356                         return 0;
1357                 case TIOCSERGWILD:
1358                 case TIOCSERSWILD:
1359                         /* "setserial -W" is called in Debian boot */
1360                         printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1361                         return 0;
1362
1363                 default:
1364                         return -ENOIOCTLCMD;
1365                 }
1366         return 0;
1367 }
1368
1369 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1370 {
1371         struct async_struct *info = (struct async_struct *)tty->driver_data;
1372         unsigned long flags;
1373         unsigned int cflag = tty->termios->c_cflag;
1374
1375         change_speed(info, old_termios);
1376
1377         /* Handle transition to B0 status */
1378         if ((old_termios->c_cflag & CBAUD) &&
1379             !(cflag & CBAUD)) {
1380                 info->MCR &= ~(SER_DTR|SER_RTS);
1381                 local_irq_save(flags);
1382                 rtsdtr_ctrl(info->MCR);
1383                 local_irq_restore(flags);
1384         }
1385
1386         /* Handle transition away from B0 status */
1387         if (!(old_termios->c_cflag & CBAUD) &&
1388             (cflag & CBAUD)) {
1389                 info->MCR |= SER_DTR;
1390                 if (!(tty->termios->c_cflag & CRTSCTS) || 
1391                     !test_bit(TTY_THROTTLED, &tty->flags)) {
1392                         info->MCR |= SER_RTS;
1393                 }
1394                 local_irq_save(flags);
1395                 rtsdtr_ctrl(info->MCR);
1396                 local_irq_restore(flags);
1397         }
1398
1399         /* Handle turning off CRTSCTS */
1400         if ((old_termios->c_cflag & CRTSCTS) &&
1401             !(tty->termios->c_cflag & CRTSCTS)) {
1402                 tty->hw_stopped = 0;
1403                 rs_start(tty);
1404         }
1405
1406 #if 0
1407         /*
1408          * No need to wake up processes in open wait, since they
1409          * sample the CLOCAL flag once, and don't recheck it.
1410          * XXX  It's not clear whether the current behavior is correct
1411          * or not.  Hence, this may change.....
1412          */
1413         if (!(old_termios->c_cflag & CLOCAL) &&
1414             (tty->termios->c_cflag & CLOCAL))
1415                 wake_up_interruptible(&info->open_wait);
1416 #endif
1417 }
1418
1419 /*
1420  * ------------------------------------------------------------
1421  * rs_close()
1422  * 
1423  * This routine is called when the serial port gets closed.  First, we
1424  * wait for the last remaining data to be sent.  Then, we unlink its
1425  * async structure from the interrupt chain if necessary, and we free
1426  * that IRQ if nothing is left in the chain.
1427  * ------------------------------------------------------------
1428  */
1429 static void rs_close(struct tty_struct *tty, struct file * filp)
1430 {
1431         struct async_struct * info = (struct async_struct *)tty->driver_data;
1432         struct serial_state *state;
1433         unsigned long flags;
1434
1435         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1436                 return;
1437
1438         state = info->state;
1439
1440         local_irq_save(flags);
1441
1442         if (tty_hung_up_p(filp)) {
1443                 DBG_CNT("before DEC-hung");
1444                 local_irq_restore(flags);
1445                 return;
1446         }
1447
1448 #ifdef SERIAL_DEBUG_OPEN
1449         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1450 #endif
1451         if ((tty->count == 1) && (state->count != 1)) {
1452                 /*
1453                  * Uh, oh.  tty->count is 1, which means that the tty
1454                  * structure will be freed.  state->count should always
1455                  * be one in these conditions.  If it's greater than
1456                  * one, we've got real problems, since it means the
1457                  * serial port won't be shutdown.
1458                  */
1459                 printk("rs_close: bad serial port count; tty->count is 1, "
1460                        "state->count is %d\n", state->count);
1461                 state->count = 1;
1462         }
1463         if (--state->count < 0) {
1464                 printk("rs_close: bad serial port count for ttys%d: %d\n",
1465                        info->line, state->count);
1466                 state->count = 0;
1467         }
1468         if (state->count) {
1469                 DBG_CNT("before DEC-2");
1470                 local_irq_restore(flags);
1471                 return;
1472         }
1473         info->flags |= ASYNC_CLOSING;
1474         /*
1475          * Now we wait for the transmit buffer to clear; and we notify 
1476          * the line discipline to only process XON/XOFF characters.
1477          */
1478         tty->closing = 1;
1479         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1480                 tty_wait_until_sent(tty, info->closing_wait);
1481         /*
1482          * At this point we stop accepting input.  To do this, we
1483          * disable the receive line status interrupts, and tell the
1484          * interrupt driver to stop checking the data ready bit in the
1485          * line status register.
1486          */
1487         info->read_status_mask &= ~UART_LSR_DR;
1488         if (info->flags & ASYNC_INITIALIZED) {
1489                 /* disable receive interrupts */
1490                 custom.intena = IF_RBF;
1491                 mb();
1492                 /* clear any pending receive interrupt */
1493                 custom.intreq = IF_RBF;
1494                 mb();
1495
1496                 /*
1497                  * Before we drop DTR, make sure the UART transmitter
1498                  * has completely drained; this is especially
1499                  * important if there is a transmit FIFO!
1500                  */
1501                 rs_wait_until_sent(tty, info->timeout);
1502         }
1503         shutdown(info);
1504         rs_flush_buffer(tty);
1505                 
1506         tty_ldisc_flush(tty);
1507         tty->closing = 0;
1508         info->event = 0;
1509         info->tty = NULL;
1510         if (info->blocked_open) {
1511                 if (info->close_delay) {
1512                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1513                 }
1514                 wake_up_interruptible(&info->open_wait);
1515         }
1516         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1517         wake_up_interruptible(&info->close_wait);
1518         local_irq_restore(flags);
1519 }
1520
1521 /*
1522  * rs_wait_until_sent() --- wait until the transmitter is empty
1523  */
1524 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1525 {
1526         struct async_struct * info = (struct async_struct *)tty->driver_data;
1527         unsigned long orig_jiffies, char_time;
1528         int lsr;
1529
1530         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1531                 return;
1532
1533         if (info->xmit_fifo_size == 0)
1534                 return; /* Just in case.... */
1535
1536         orig_jiffies = jiffies;
1537
1538         lock_kernel();
1539         /*
1540          * Set the check interval to be 1/5 of the estimated time to
1541          * send a single character, and make it at least 1.  The check
1542          * interval should also be less than the timeout.
1543          * 
1544          * Note: we have to use pretty tight timings here to satisfy
1545          * the NIST-PCTS.
1546          */
1547         char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1548         char_time = char_time / 5;
1549         if (char_time == 0)
1550                 char_time = 1;
1551         if (timeout)
1552           char_time = min_t(unsigned long, char_time, timeout);
1553         /*
1554          * If the transmitter hasn't cleared in twice the approximate
1555          * amount of time to send the entire FIFO, it probably won't
1556          * ever clear.  This assumes the UART isn't doing flow
1557          * control, which is currently the case.  Hence, if it ever
1558          * takes longer than info->timeout, this is probably due to a
1559          * UART bug of some kind.  So, we clamp the timeout parameter at
1560          * 2*info->timeout.
1561          */
1562         if (!timeout || timeout > 2*info->timeout)
1563                 timeout = 2*info->timeout;
1564 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1565         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1566         printk("jiff=%lu...", jiffies);
1567 #endif
1568         while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1569 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1570                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1571 #endif
1572                 msleep_interruptible(jiffies_to_msecs(char_time));
1573                 if (signal_pending(current))
1574                         break;
1575                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1576                         break;
1577         }
1578         __set_current_state(TASK_RUNNING);
1579         unlock_kernel();
1580 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1581         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1582 #endif
1583 }
1584
1585 /*
1586  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1587  */
1588 static void rs_hangup(struct tty_struct *tty)
1589 {
1590         struct async_struct * info = (struct async_struct *)tty->driver_data;
1591         struct serial_state *state = info->state;
1592
1593         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1594                 return;
1595
1596         state = info->state;
1597
1598         rs_flush_buffer(tty);
1599         shutdown(info);
1600         info->event = 0;
1601         state->count = 0;
1602         info->flags &= ~ASYNC_NORMAL_ACTIVE;
1603         info->tty = NULL;
1604         wake_up_interruptible(&info->open_wait);
1605 }
1606
1607 /*
1608  * ------------------------------------------------------------
1609  * rs_open() and friends
1610  * ------------------------------------------------------------
1611  */
1612 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1613                            struct async_struct *info)
1614 {
1615 #ifdef DECLARE_WAITQUEUE
1616         DECLARE_WAITQUEUE(wait, current);
1617 #else
1618         struct wait_queue wait = { current, NULL };
1619 #endif
1620         struct serial_state *state = info->state;
1621         int             retval;
1622         int             do_clocal = 0, extra_count = 0;
1623         unsigned long   flags;
1624
1625         /*
1626          * If the device is in the middle of being closed, then block
1627          * until it's done, and then try again.
1628          */
1629         if (tty_hung_up_p(filp) ||
1630             (info->flags & ASYNC_CLOSING)) {
1631                 if (info->flags & ASYNC_CLOSING)
1632                         interruptible_sleep_on(&info->close_wait);
1633 #ifdef SERIAL_DO_RESTART
1634                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1635                         -EAGAIN : -ERESTARTSYS);
1636 #else
1637                 return -EAGAIN;
1638 #endif
1639         }
1640
1641         /*
1642          * If non-blocking mode is set, or the port is not enabled,
1643          * then make the check up front and then exit.
1644          */
1645         if ((filp->f_flags & O_NONBLOCK) ||
1646             (tty->flags & (1 << TTY_IO_ERROR))) {
1647                 info->flags |= ASYNC_NORMAL_ACTIVE;
1648                 return 0;
1649         }
1650
1651         if (tty->termios->c_cflag & CLOCAL)
1652                 do_clocal = 1;
1653
1654         /*
1655          * Block waiting for the carrier detect and the line to become
1656          * free (i.e., not in use by the callout).  While we are in
1657          * this loop, state->count is dropped by one, so that
1658          * rs_close() knows when to free things.  We restore it upon
1659          * exit, either normal or abnormal.
1660          */
1661         retval = 0;
1662         add_wait_queue(&info->open_wait, &wait);
1663 #ifdef SERIAL_DEBUG_OPEN
1664         printk("block_til_ready before block: ttys%d, count = %d\n",
1665                state->line, state->count);
1666 #endif
1667         local_irq_save(flags);
1668         if (!tty_hung_up_p(filp)) {
1669                 extra_count = 1;
1670                 state->count--;
1671         }
1672         local_irq_restore(flags);
1673         info->blocked_open++;
1674         while (1) {
1675                 local_irq_save(flags);
1676                 if (tty->termios->c_cflag & CBAUD)
1677                         rtsdtr_ctrl(SER_DTR|SER_RTS);
1678                 local_irq_restore(flags);
1679                 set_current_state(TASK_INTERRUPTIBLE);
1680                 if (tty_hung_up_p(filp) ||
1681                     !(info->flags & ASYNC_INITIALIZED)) {
1682 #ifdef SERIAL_DO_RESTART
1683                         if (info->flags & ASYNC_HUP_NOTIFY)
1684                                 retval = -EAGAIN;
1685                         else
1686                                 retval = -ERESTARTSYS;
1687 #else
1688                         retval = -EAGAIN;
1689 #endif
1690                         break;
1691                 }
1692                 if (!(info->flags & ASYNC_CLOSING) &&
1693                     (do_clocal || (!(ciab.pra & SER_DCD)) ))
1694                         break;
1695                 if (signal_pending(current)) {
1696                         retval = -ERESTARTSYS;
1697                         break;
1698                 }
1699 #ifdef SERIAL_DEBUG_OPEN
1700                 printk("block_til_ready blocking: ttys%d, count = %d\n",
1701                        info->line, state->count);
1702 #endif
1703                 schedule();
1704         }
1705         __set_current_state(TASK_RUNNING);
1706         remove_wait_queue(&info->open_wait, &wait);
1707         if (extra_count)
1708                 state->count++;
1709         info->blocked_open--;
1710 #ifdef SERIAL_DEBUG_OPEN
1711         printk("block_til_ready after blocking: ttys%d, count = %d\n",
1712                info->line, state->count);
1713 #endif
1714         if (retval)
1715                 return retval;
1716         info->flags |= ASYNC_NORMAL_ACTIVE;
1717         return 0;
1718 }
1719
1720 static int get_async_struct(int line, struct async_struct **ret_info)
1721 {
1722         struct async_struct *info;
1723         struct serial_state *sstate;
1724
1725         sstate = rs_table + line;
1726         sstate->count++;
1727         if (sstate->info) {
1728                 *ret_info = sstate->info;
1729                 return 0;
1730         }
1731         info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1732         if (!info) {
1733                 sstate->count--;
1734                 return -ENOMEM;
1735         }
1736 #ifdef DECLARE_WAITQUEUE
1737         init_waitqueue_head(&info->open_wait);
1738         init_waitqueue_head(&info->close_wait);
1739         init_waitqueue_head(&info->delta_msr_wait);
1740 #endif
1741         info->magic = SERIAL_MAGIC;
1742         info->port = sstate->port;
1743         info->flags = sstate->flags;
1744         info->xmit_fifo_size = sstate->xmit_fifo_size;
1745         info->line = line;
1746         tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1747         info->state = sstate;
1748         if (sstate->info) {
1749                 kfree(info);
1750                 *ret_info = sstate->info;
1751                 return 0;
1752         }
1753         *ret_info = sstate->info = info;
1754         return 0;
1755 }
1756
1757 /*
1758  * This routine is called whenever a serial port is opened.  It
1759  * enables interrupts for a serial port, linking in its async structure into
1760  * the IRQ chain.   It also performs the serial-specific
1761  * initialization for the tty structure.
1762  */
1763 static int rs_open(struct tty_struct *tty, struct file * filp)
1764 {
1765         struct async_struct     *info;
1766         int                     retval, line;
1767
1768         line = tty->index;
1769         if ((line < 0) || (line >= NR_PORTS)) {
1770                 return -ENODEV;
1771         }
1772         retval = get_async_struct(line, &info);
1773         if (retval) {
1774                 return retval;
1775         }
1776         tty->driver_data = info;
1777         info->tty = tty;
1778         if (serial_paranoia_check(info, tty->name, "rs_open"))
1779                 return -ENODEV;
1780
1781 #ifdef SERIAL_DEBUG_OPEN
1782         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1783 #endif
1784         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1785
1786         /*
1787          * If the port is the middle of closing, bail out now
1788          */
1789         if (tty_hung_up_p(filp) ||
1790             (info->flags & ASYNC_CLOSING)) {
1791                 if (info->flags & ASYNC_CLOSING)
1792                         interruptible_sleep_on(&info->close_wait);
1793 #ifdef SERIAL_DO_RESTART
1794                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1795                         -EAGAIN : -ERESTARTSYS);
1796 #else
1797                 return -EAGAIN;
1798 #endif
1799         }
1800
1801         /*
1802          * Start up serial port
1803          */
1804         retval = startup(info);
1805         if (retval) {
1806                 return retval;
1807         }
1808
1809         retval = block_til_ready(tty, filp, info);
1810         if (retval) {
1811 #ifdef SERIAL_DEBUG_OPEN
1812                 printk("rs_open returning after block_til_ready with %d\n",
1813                        retval);
1814 #endif
1815                 return retval;
1816         }
1817
1818 #ifdef SERIAL_DEBUG_OPEN
1819         printk("rs_open %s successful...", tty->name);
1820 #endif
1821         return 0;
1822 }
1823
1824 /*
1825  * /proc fs routines....
1826  */
1827
1828 static inline int line_info(char *buf, struct serial_state *state)
1829 {
1830         struct async_struct *info = state->info, scr_info;
1831         char    stat_buf[30], control, status;
1832         int     ret;
1833         unsigned long flags;
1834
1835         ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1836
1837         /*
1838          * Figure out the current RS-232 lines
1839          */
1840         if (!info) {
1841                 info = &scr_info;       /* This is just for serial_{in,out} */
1842
1843                 info->magic = SERIAL_MAGIC;
1844                 info->flags = state->flags;
1845                 info->quot = 0;
1846                 info->tty = NULL;
1847         }
1848         local_irq_save(flags);
1849         status = ciab.pra;
1850         control = info ? info->MCR : status;
1851         local_irq_restore(flags);
1852
1853         stat_buf[0] = 0;
1854         stat_buf[1] = 0;
1855         if(!(control & SER_RTS))
1856                 strcat(stat_buf, "|RTS");
1857         if(!(status & SER_CTS))
1858                 strcat(stat_buf, "|CTS");
1859         if(!(control & SER_DTR))
1860                 strcat(stat_buf, "|DTR");
1861         if(!(status & SER_DSR))
1862                 strcat(stat_buf, "|DSR");
1863         if(!(status & SER_DCD))
1864                 strcat(stat_buf, "|CD");
1865
1866         if (info->quot) {
1867                 ret += sprintf(buf+ret, " baud:%d",
1868                                state->baud_base / info->quot);
1869         }
1870
1871         ret += sprintf(buf+ret, " tx:%d rx:%d",
1872                       state->icount.tx, state->icount.rx);
1873
1874         if (state->icount.frame)
1875                 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1876
1877         if (state->icount.parity)
1878                 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1879
1880         if (state->icount.brk)
1881                 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1882
1883         if (state->icount.overrun)
1884                 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1885
1886         /*
1887          * Last thing is the RS-232 status lines
1888          */
1889         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1890         return ret;
1891 }
1892
1893 static int rs_read_proc(char *page, char **start, off_t off, int count,
1894                         int *eof, void *data)
1895 {
1896         int len = 0, l;
1897         off_t   begin = 0;
1898
1899         len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1900         l = line_info(page + len, &rs_table[0]);
1901         len += l;
1902         if (len+begin > off+count)
1903           goto done;
1904         if (len+begin < off) {
1905           begin += len;
1906           len = 0;
1907         }
1908         *eof = 1;
1909 done:
1910         if (off >= len+begin)
1911                 return 0;
1912         *start = page + (off-begin);
1913         return ((count < begin+len-off) ? count : begin+len-off);
1914 }
1915
1916 /*
1917  * ---------------------------------------------------------------------
1918  * rs_init() and friends
1919  *
1920  * rs_init() is called at boot-time to initialize the serial driver.
1921  * ---------------------------------------------------------------------
1922  */
1923
1924 /*
1925  * This routine prints out the appropriate serial driver version
1926  * number, and identifies which options were configured into this
1927  * driver.
1928  */
1929 static void show_serial_version(void)
1930 {
1931         printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1932 }
1933
1934
1935 static const struct tty_operations serial_ops = {
1936         .open = rs_open,
1937         .close = rs_close,
1938         .write = rs_write,
1939         .put_char = rs_put_char,
1940         .flush_chars = rs_flush_chars,
1941         .write_room = rs_write_room,
1942         .chars_in_buffer = rs_chars_in_buffer,
1943         .flush_buffer = rs_flush_buffer,
1944         .ioctl = rs_ioctl,
1945         .throttle = rs_throttle,
1946         .unthrottle = rs_unthrottle,
1947         .set_termios = rs_set_termios,
1948         .stop = rs_stop,
1949         .start = rs_start,
1950         .hangup = rs_hangup,
1951         .break_ctl = rs_break,
1952         .send_xchar = rs_send_xchar,
1953         .wait_until_sent = rs_wait_until_sent,
1954         .read_proc = rs_read_proc,
1955         .tiocmget = rs_tiocmget,
1956         .tiocmset = rs_tiocmset,
1957 };
1958
1959 /*
1960  * The serial driver boot-time initialization code!
1961  */
1962 static int __init rs_init(void)
1963 {
1964         unsigned long flags;
1965         struct serial_state * state;
1966
1967         if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
1968                 return -ENODEV;
1969
1970         serial_driver = alloc_tty_driver(1);
1971         if (!serial_driver)
1972                 return -ENOMEM;
1973
1974         /*
1975          *  We request SERDAT and SERPER only, because the serial registers are
1976          *  too spreaded over the custom register space
1977          */
1978         if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
1979                 return -EBUSY;
1980
1981         IRQ_ports = NULL;
1982
1983         show_serial_version();
1984
1985         /* Initialize the tty_driver structure */
1986
1987         serial_driver->owner = THIS_MODULE;
1988         serial_driver->driver_name = "amiserial";
1989         serial_driver->name = "ttyS";
1990         serial_driver->major = TTY_MAJOR;
1991         serial_driver->minor_start = 64;
1992         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1993         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1994         serial_driver->init_termios = tty_std_termios;
1995         serial_driver->init_termios.c_cflag =
1996                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1997         serial_driver->flags = TTY_DRIVER_REAL_RAW;
1998         tty_set_operations(serial_driver, &serial_ops);
1999
2000         if (tty_register_driver(serial_driver))
2001                 panic("Couldn't register serial driver\n");
2002
2003         state = rs_table;
2004         state->magic = SSTATE_MAGIC;
2005         state->port = (int)&custom.serdatr; /* Just to give it a value */
2006         state->line = 0;
2007         state->custom_divisor = 0;
2008         state->close_delay = 5*HZ/10;
2009         state->closing_wait = 30*HZ;
2010         state->icount.cts = state->icount.dsr = 
2011           state->icount.rng = state->icount.dcd = 0;
2012         state->icount.rx = state->icount.tx = 0;
2013         state->icount.frame = state->icount.parity = 0;
2014         state->icount.overrun = state->icount.brk = 0;
2015
2016         printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2017                        state->line);
2018
2019         /* Hardware set up */
2020
2021         state->baud_base = amiga_colorclock;
2022         state->xmit_fifo_size = 1;
2023
2024         local_irq_save(flags);
2025
2026         /* set ISRs, and then disable the rx interrupts */
2027         request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2028         request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, "serial RX", state);
2029
2030         /* turn off Rx and Tx interrupts */
2031         custom.intena = IF_RBF | IF_TBE;
2032         mb();
2033
2034         /* clear any pending interrupt */
2035         custom.intreq = IF_RBF | IF_TBE;
2036         mb();
2037
2038         local_irq_restore(flags);
2039
2040         /*
2041          * set the appropriate directions for the modem control flags,
2042          * and clear RTS and DTR
2043          */
2044         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
2045         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
2046
2047         return 0;
2048 }
2049
2050 static __exit void rs_exit(void) 
2051 {
2052         int error;
2053         struct async_struct *info = rs_table[0].info;
2054
2055         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2056         tasklet_kill(&info->tlet);
2057         if ((error = tty_unregister_driver(serial_driver)))
2058                 printk("SERIAL: failed to unregister serial driver (%d)\n",
2059                        error);
2060         put_tty_driver(serial_driver);
2061
2062         if (info) {
2063           rs_table[0].info = NULL;
2064           kfree(info);
2065         }
2066
2067         release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2068 }
2069
2070 module_init(rs_init)
2071 module_exit(rs_exit)
2072
2073
2074 /*
2075  * ------------------------------------------------------------
2076  * Serial console driver
2077  * ------------------------------------------------------------
2078  */
2079 #ifdef CONFIG_SERIAL_CONSOLE
2080
2081 static void amiga_serial_putc(char c)
2082 {
2083         custom.serdat = (unsigned char)c | 0x100;
2084         while (!(custom.serdatr & 0x2000))
2085                 barrier();
2086 }
2087
2088 /*
2089  *      Print a string to the serial port trying not to disturb
2090  *      any possible real use of the port...
2091  *
2092  *      The console must be locked when we get here.
2093  */
2094 static void serial_console_write(struct console *co, const char *s,
2095                                 unsigned count)
2096 {
2097         unsigned short intena = custom.intenar;
2098
2099         custom.intena = IF_TBE;
2100
2101         while (count--) {
2102                 if (*s == '\n')
2103                         amiga_serial_putc('\r');
2104                 amiga_serial_putc(*s++);
2105         }
2106
2107         custom.intena = IF_SETCLR | (intena & IF_TBE);
2108 }
2109
2110 static struct tty_driver *serial_console_device(struct console *c, int *index)
2111 {
2112         *index = 0;
2113         return serial_driver;
2114 }
2115
2116 static struct console sercons = {
2117         .name =         "ttyS",
2118         .write =        serial_console_write,
2119         .device =       serial_console_device,
2120         .flags =        CON_PRINTBUFFER,
2121         .index =        -1,
2122 };
2123
2124 /*
2125  *      Register console.
2126  */
2127 static int __init amiserial_console_init(void)
2128 {
2129         register_console(&sercons);
2130         return 0;
2131 }
2132 console_initcall(amiserial_console_init);
2133 #endif
2134
2135 MODULE_LICENSE("GPL");