BKL: remove extraneous #include <smp_lock.h>
[linux-3.10.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/seq_file.h>
83 #include <linux/slab.h>
84 #include <linux/init.h>
85 #include <linux/bitops.h>
86 #include <linux/platform_device.h>
87
88 #include <asm/setup.h>
89
90 #include <asm/system.h>
91
92 #include <asm/irq.h>
93
94 #include <asm/amigahw.h>
95 #include <asm/amigaints.h>
96
97 #define custom amiga_custom
98 static char *serial_name = "Amiga-builtin serial driver";
99
100 static struct tty_driver *serial_driver;
101
102 /* number of characters left in xmit buffer before we ask for more */
103 #define WAKEUP_CHARS 256
104
105 static struct async_struct *IRQ_ports;
106
107 static unsigned char current_ctl_bits;
108
109 static void change_speed(struct async_struct *info, struct ktermios *old);
110 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
111
112
113 static struct serial_state rs_table[1];
114
115 #define NR_PORTS ARRAY_SIZE(rs_table)
116
117 #include <asm/uaccess.h>
118
119 #define serial_isroot() (capable(CAP_SYS_ADMIN))
120
121
122 static inline int serial_paranoia_check(struct async_struct *info,
123                                         char *name, const char *routine)
124 {
125 #ifdef SERIAL_PARANOIA_CHECK
126         static const char *badmagic =
127                 "Warning: bad magic number for serial struct (%s) in %s\n";
128         static const char *badinfo =
129                 "Warning: null async_struct for (%s) in %s\n";
130
131         if (!info) {
132                 printk(badinfo, name, routine);
133                 return 1;
134         }
135         if (info->magic != SERIAL_MAGIC) {
136                 printk(badmagic, name, routine);
137                 return 1;
138         }
139 #endif
140         return 0;
141 }
142
143 /* some serial hardware definitions */
144 #define SDR_OVRUN   (1<<15)
145 #define SDR_RBF     (1<<14)
146 #define SDR_TBE     (1<<13)
147 #define SDR_TSRE    (1<<12)
148
149 #define SERPER_PARENB    (1<<15)
150
151 #define AC_SETCLR   (1<<15)
152 #define AC_UARTBRK  (1<<11)
153
154 #define SER_DTR     (1<<7)
155 #define SER_RTS     (1<<6)
156 #define SER_DCD     (1<<5)
157 #define SER_CTS     (1<<4)
158 #define SER_DSR     (1<<3)
159
160 static __inline__ void rtsdtr_ctrl(int bits)
161 {
162     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
163 }
164
165 /*
166  * ------------------------------------------------------------
167  * rs_stop() and rs_start()
168  *
169  * This routines are called before setting or resetting tty->stopped.
170  * They enable or disable transmitter interrupts, as necessary.
171  * ------------------------------------------------------------
172  */
173 static void rs_stop(struct tty_struct *tty)
174 {
175         struct async_struct *info = tty->driver_data;
176         unsigned long flags;
177
178         if (serial_paranoia_check(info, tty->name, "rs_stop"))
179                 return;
180
181         local_irq_save(flags);
182         if (info->IER & UART_IER_THRI) {
183                 info->IER &= ~UART_IER_THRI;
184                 /* disable Tx interrupt and remove any pending interrupts */
185                 custom.intena = IF_TBE;
186                 mb();
187                 custom.intreq = IF_TBE;
188                 mb();
189         }
190         local_irq_restore(flags);
191 }
192
193 static void rs_start(struct tty_struct *tty)
194 {
195         struct async_struct *info = tty->driver_data;
196         unsigned long flags;
197
198         if (serial_paranoia_check(info, tty->name, "rs_start"))
199                 return;
200
201         local_irq_save(flags);
202         if (info->xmit.head != info->xmit.tail
203             && info->xmit.buf
204             && !(info->IER & UART_IER_THRI)) {
205                 info->IER |= UART_IER_THRI;
206                 custom.intena = IF_SETCLR | IF_TBE;
207                 mb();
208                 /* set a pending Tx Interrupt, transmitter should restart now */
209                 custom.intreq = IF_SETCLR | IF_TBE;
210                 mb();
211         }
212         local_irq_restore(flags);
213 }
214
215 /*
216  * ----------------------------------------------------------------------
217  *
218  * Here starts the interrupt handling routines.  All of the following
219  * subroutines are declared as inline and are folded into
220  * rs_interrupt().  They were separated out for readability's sake.
221  *
222  * Note: rs_interrupt() is a "fast" interrupt, which means that it
223  * runs with interrupts turned off.  People who may want to modify
224  * rs_interrupt() should try to keep the interrupt handler as fast as
225  * possible.  After you are done making modifications, it is not a bad
226  * idea to do:
227  * 
228  * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
229  *
230  * and look at the resulting assemble code in serial.s.
231  *
232  *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
233  * -----------------------------------------------------------------------
234  */
235
236 /*
237  * This routine is used by the interrupt handler to schedule
238  * processing in the software interrupt portion of the driver.
239  */
240 static void rs_sched_event(struct async_struct *info,
241                            int event)
242 {
243         info->event |= 1 << event;
244         tasklet_schedule(&info->tlet);
245 }
246
247 static void receive_chars(struct async_struct *info)
248 {
249         int status;
250         int serdatr;
251         struct tty_struct *tty = info->tty;
252         unsigned char ch, flag;
253         struct  async_icount *icount;
254         int oe = 0;
255
256         icount = &info->state->icount;
257
258         status = UART_LSR_DR; /* We obviously have a character! */
259         serdatr = custom.serdatr;
260         mb();
261         custom.intreq = IF_RBF;
262         mb();
263
264         if((serdatr & 0x1ff) == 0)
265             status |= UART_LSR_BI;
266         if(serdatr & SDR_OVRUN)
267             status |= UART_LSR_OE;
268
269         ch = serdatr & 0xff;
270         icount->rx++;
271
272 #ifdef SERIAL_DEBUG_INTR
273         printk("DR%02x:%02x...", ch, status);
274 #endif
275         flag = TTY_NORMAL;
276
277         /*
278          * We don't handle parity or frame errors - but I have left
279          * the code in, since I'm not sure that the errors can't be
280          * detected.
281          */
282
283         if (status & (UART_LSR_BI | UART_LSR_PE |
284                       UART_LSR_FE | UART_LSR_OE)) {
285           /*
286            * For statistics only
287            */
288           if (status & UART_LSR_BI) {
289             status &= ~(UART_LSR_FE | UART_LSR_PE);
290             icount->brk++;
291           } else if (status & UART_LSR_PE)
292             icount->parity++;
293           else if (status & UART_LSR_FE)
294             icount->frame++;
295           if (status & UART_LSR_OE)
296             icount->overrun++;
297
298           /*
299            * Now check to see if character should be
300            * ignored, and mask off conditions which
301            * should be ignored.
302            */
303           if (status & info->ignore_status_mask)
304             goto out;
305
306           status &= info->read_status_mask;
307
308           if (status & (UART_LSR_BI)) {
309 #ifdef SERIAL_DEBUG_INTR
310             printk("handling break....");
311 #endif
312             flag = TTY_BREAK;
313             if (info->flags & ASYNC_SAK)
314               do_SAK(tty);
315           } else if (status & UART_LSR_PE)
316             flag = TTY_PARITY;
317           else if (status & UART_LSR_FE)
318             flag = TTY_FRAME;
319           if (status & UART_LSR_OE) {
320             /*
321              * Overrun is special, since it's
322              * reported immediately, and doesn't
323              * affect the current character
324              */
325              oe = 1;
326           }
327         }
328         tty_insert_flip_char(tty, ch, flag);
329         if (oe == 1)
330                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
331         tty_flip_buffer_push(tty);
332 out:
333         return;
334 }
335
336 static void transmit_chars(struct async_struct *info)
337 {
338         custom.intreq = IF_TBE;
339         mb();
340         if (info->x_char) {
341                 custom.serdat = info->x_char | 0x100;
342                 mb();
343                 info->state->icount.tx++;
344                 info->x_char = 0;
345                 return;
346         }
347         if (info->xmit.head == info->xmit.tail
348             || info->tty->stopped
349             || info->tty->hw_stopped) {
350                 info->IER &= ~UART_IER_THRI;
351                 custom.intena = IF_TBE;
352                 mb();
353                 return;
354         }
355
356         custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
357         mb();
358         info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
359         info->state->icount.tx++;
360
361         if (CIRC_CNT(info->xmit.head,
362                      info->xmit.tail,
363                      SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
364                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
365
366 #ifdef SERIAL_DEBUG_INTR
367         printk("THRE...");
368 #endif
369         if (info->xmit.head == info->xmit.tail) {
370                 custom.intena = IF_TBE;
371                 mb();
372                 info->IER &= ~UART_IER_THRI;
373         }
374 }
375
376 static void check_modem_status(struct async_struct *info)
377 {
378         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
379         unsigned char dstatus;
380         struct  async_icount *icount;
381
382         /* Determine bits that have changed */
383         dstatus = status ^ current_ctl_bits;
384         current_ctl_bits = status;
385
386         if (dstatus) {
387                 icount = &info->state->icount;
388                 /* update input line counters */
389                 if (dstatus & SER_DSR)
390                         icount->dsr++;
391                 if (dstatus & SER_DCD) {
392                         icount->dcd++;
393 #ifdef CONFIG_HARD_PPS
394                         if ((info->flags & ASYNC_HARDPPS_CD) &&
395                             !(status & SER_DCD))
396                                 hardpps();
397 #endif
398                 }
399                 if (dstatus & SER_CTS)
400                         icount->cts++;
401                 wake_up_interruptible(&info->delta_msr_wait);
402         }
403
404         if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
405 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
406                 printk("ttyS%d CD now %s...", info->line,
407                        (!(status & SER_DCD)) ? "on" : "off");
408 #endif
409                 if (!(status & SER_DCD))
410                         wake_up_interruptible(&info->open_wait);
411                 else {
412 #ifdef SERIAL_DEBUG_OPEN
413                         printk("doing serial hangup...");
414 #endif
415                         if (info->tty)
416                                 tty_hangup(info->tty);
417                 }
418         }
419         if (info->flags & ASYNC_CTS_FLOW) {
420                 if (info->tty->hw_stopped) {
421                         if (!(status & SER_CTS)) {
422 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
423                                 printk("CTS tx start...");
424 #endif
425                                 info->tty->hw_stopped = 0;
426                                 info->IER |= UART_IER_THRI;
427                                 custom.intena = IF_SETCLR | IF_TBE;
428                                 mb();
429                                 /* set a pending Tx Interrupt, transmitter should restart now */
430                                 custom.intreq = IF_SETCLR | IF_TBE;
431                                 mb();
432                                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
433                                 return;
434                         }
435                 } else {
436                         if ((status & SER_CTS)) {
437 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
438                                 printk("CTS tx stop...");
439 #endif
440                                 info->tty->hw_stopped = 1;
441                                 info->IER &= ~UART_IER_THRI;
442                                 /* disable Tx interrupt and remove any pending interrupts */
443                                 custom.intena = IF_TBE;
444                                 mb();
445                                 custom.intreq = IF_TBE;
446                                 mb();
447                         }
448                 }
449         }
450 }
451
452 static irqreturn_t ser_vbl_int( int irq, void *data)
453 {
454         /* vbl is just a periodic interrupt we tie into to update modem status */
455         struct async_struct * info = IRQ_ports;
456         /*
457          * TBD - is it better to unregister from this interrupt or to
458          * ignore it if MSI is clear ?
459          */
460         if(info->IER & UART_IER_MSI)
461           check_modem_status(info);
462         return IRQ_HANDLED;
463 }
464
465 static irqreturn_t ser_rx_int(int irq, void *dev_id)
466 {
467         struct async_struct * info;
468
469 #ifdef SERIAL_DEBUG_INTR
470         printk("ser_rx_int...");
471 #endif
472
473         info = IRQ_ports;
474         if (!info || !info->tty)
475                 return IRQ_NONE;
476
477         receive_chars(info);
478         info->last_active = jiffies;
479 #ifdef SERIAL_DEBUG_INTR
480         printk("end.\n");
481 #endif
482         return IRQ_HANDLED;
483 }
484
485 static irqreturn_t ser_tx_int(int irq, void *dev_id)
486 {
487         struct async_struct * info;
488
489         if (custom.serdatr & SDR_TBE) {
490 #ifdef SERIAL_DEBUG_INTR
491           printk("ser_tx_int...");
492 #endif
493
494           info = IRQ_ports;
495           if (!info || !info->tty)
496                 return IRQ_NONE;
497
498           transmit_chars(info);
499           info->last_active = jiffies;
500 #ifdef SERIAL_DEBUG_INTR
501           printk("end.\n");
502 #endif
503         }
504         return IRQ_HANDLED;
505 }
506
507 /*
508  * -------------------------------------------------------------------
509  * Here ends the serial interrupt routines.
510  * -------------------------------------------------------------------
511  */
512
513 /*
514  * This routine is used to handle the "bottom half" processing for the
515  * serial driver, known also the "software interrupt" processing.
516  * This processing is done at the kernel interrupt level, after the
517  * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
518  * is where time-consuming activities which can not be done in the
519  * interrupt driver proper are done; the interrupt driver schedules
520  * them using rs_sched_event(), and they get done here.
521  */
522
523 static void do_softint(unsigned long private_)
524 {
525         struct async_struct     *info = (struct async_struct *) private_;
526         struct tty_struct       *tty;
527
528         tty = info->tty;
529         if (!tty)
530                 return;
531
532         if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
533                 tty_wakeup(tty);
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                 /* FIXME: Will need updating for new tty in the end */
744                 info->tty->termios->c_cflag &= ~CBAUD;
745                 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
746                 baud = tty_get_baud_rate(info->tty);
747                 if (!baud)
748                         baud = 9600;
749                 if (baud == 38400 &&
750                     ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
751                         quot = info->state->custom_divisor;
752                 else {
753                         if (baud == 134)
754                                 /* Special case since 134 is really 134.5 */
755                                 quot = (2*baud_base / 269);
756                         else if (baud)
757                                 quot = baud_base / baud;
758                 }
759         }
760         /* As a last resort, if the quotient is zero, default to 9600 bps */
761         if (!quot)
762                 quot = baud_base / 9600;
763         info->quot = quot;
764         info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
765         info->timeout += HZ/50;         /* Add .02 seconds of slop */
766
767         /* CTS flow control flag and modem status interrupts */
768         info->IER &= ~UART_IER_MSI;
769         if (info->flags & ASYNC_HARDPPS_CD)
770                 info->IER |= UART_IER_MSI;
771         if (cflag & CRTSCTS) {
772                 info->flags |= ASYNC_CTS_FLOW;
773                 info->IER |= UART_IER_MSI;
774         } else
775                 info->flags &= ~ASYNC_CTS_FLOW;
776         if (cflag & CLOCAL)
777                 info->flags &= ~ASYNC_CHECK_CD;
778         else {
779                 info->flags |= ASYNC_CHECK_CD;
780                 info->IER |= UART_IER_MSI;
781         }
782         /* TBD:
783          * Does clearing IER_MSI imply that we should disable the VBL interrupt ?
784          */
785
786         /*
787          * Set up parity check flag
788          */
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 int rs_put_char(struct tty_struct *tty, unsigned char ch)
838 {
839         struct async_struct *info;
840         unsigned long flags;
841
842         info = tty->driver_data;
843
844         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
845                 return 0;
846
847         if (!info->xmit.buf)
848                 return 0;
849
850         local_irq_save(flags);
851         if (CIRC_SPACE(info->xmit.head,
852                        info->xmit.tail,
853                        SERIAL_XMIT_SIZE) == 0) {
854                 local_irq_restore(flags);
855                 return 0;
856         }
857
858         info->xmit.buf[info->xmit.head++] = ch;
859         info->xmit.head &= SERIAL_XMIT_SIZE-1;
860         local_irq_restore(flags);
861         return 1;
862 }
863
864 static void rs_flush_chars(struct tty_struct *tty)
865 {
866         struct async_struct *info = tty->driver_data;
867         unsigned long flags;
868
869         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
870                 return;
871
872         if (info->xmit.head == info->xmit.tail
873             || tty->stopped
874             || tty->hw_stopped
875             || !info->xmit.buf)
876                 return;
877
878         local_irq_save(flags);
879         info->IER |= UART_IER_THRI;
880         custom.intena = IF_SETCLR | IF_TBE;
881         mb();
882         /* set a pending Tx Interrupt, transmitter should restart now */
883         custom.intreq = IF_SETCLR | IF_TBE;
884         mb();
885         local_irq_restore(flags);
886 }
887
888 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
889 {
890         int     c, ret = 0;
891         struct async_struct *info;
892         unsigned long flags;
893
894         info = tty->driver_data;
895
896         if (serial_paranoia_check(info, tty->name, "rs_write"))
897                 return 0;
898
899         if (!info->xmit.buf)
900                 return 0;
901
902         local_irq_save(flags);
903         while (1) {
904                 c = CIRC_SPACE_TO_END(info->xmit.head,
905                                       info->xmit.tail,
906                                       SERIAL_XMIT_SIZE);
907                 if (count < c)
908                         c = count;
909                 if (c <= 0) {
910                         break;
911                 }
912                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
913                 info->xmit.head = ((info->xmit.head + c) &
914                                    (SERIAL_XMIT_SIZE-1));
915                 buf += c;
916                 count -= c;
917                 ret += c;
918         }
919         local_irq_restore(flags);
920
921         if (info->xmit.head != info->xmit.tail
922             && !tty->stopped
923             && !tty->hw_stopped
924             && !(info->IER & UART_IER_THRI)) {
925                 info->IER |= UART_IER_THRI;
926                 local_irq_disable();
927                 custom.intena = IF_SETCLR | IF_TBE;
928                 mb();
929                 /* set a pending Tx Interrupt, transmitter should restart now */
930                 custom.intreq = IF_SETCLR | IF_TBE;
931                 mb();
932                 local_irq_restore(flags);
933         }
934         return ret;
935 }
936
937 static int rs_write_room(struct tty_struct *tty)
938 {
939         struct async_struct *info = tty->driver_data;
940
941         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
942                 return 0;
943         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
944 }
945
946 static int rs_chars_in_buffer(struct tty_struct *tty)
947 {
948         struct async_struct *info = tty->driver_data;
949
950         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
951                 return 0;
952         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
953 }
954
955 static void rs_flush_buffer(struct tty_struct *tty)
956 {
957         struct async_struct *info = tty->driver_data;
958         unsigned long flags;
959
960         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
961                 return;
962         local_irq_save(flags);
963         info->xmit.head = info->xmit.tail = 0;
964         local_irq_restore(flags);
965         tty_wakeup(tty);
966 }
967
968 /*
969  * This function is used to send a high-priority XON/XOFF character to
970  * the device
971  */
972 static void rs_send_xchar(struct tty_struct *tty, char ch)
973 {
974         struct async_struct *info = tty->driver_data;
975         unsigned long flags;
976
977         if (serial_paranoia_check(info, tty->name, "rs_send_char"))
978                 return;
979
980         info->x_char = ch;
981         if (ch) {
982                 /* Make sure transmit interrupts are on */
983
984                 /* Check this ! */
985                 local_irq_save(flags);
986                 if(!(custom.intenar & IF_TBE)) {
987                     custom.intena = IF_SETCLR | IF_TBE;
988                     mb();
989                     /* set a pending Tx Interrupt, transmitter should restart now */
990                     custom.intreq = IF_SETCLR | IF_TBE;
991                     mb();
992                 }
993                 local_irq_restore(flags);
994
995                 info->IER |= UART_IER_THRI;
996         }
997 }
998
999 /*
1000  * ------------------------------------------------------------
1001  * rs_throttle()
1002  * 
1003  * This routine is called by the upper-layer tty layer to signal that
1004  * incoming characters should be throttled.
1005  * ------------------------------------------------------------
1006  */
1007 static void rs_throttle(struct tty_struct * tty)
1008 {
1009         struct async_struct *info = tty->driver_data;
1010         unsigned long flags;
1011 #ifdef SERIAL_DEBUG_THROTTLE
1012         char    buf[64];
1013
1014         printk("throttle %s: %d....\n", tty_name(tty, buf),
1015                tty->ldisc.chars_in_buffer(tty));
1016 #endif
1017
1018         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1019                 return;
1020
1021         if (I_IXOFF(tty))
1022                 rs_send_xchar(tty, STOP_CHAR(tty));
1023
1024         if (tty->termios->c_cflag & CRTSCTS)
1025                 info->MCR &= ~SER_RTS;
1026
1027         local_irq_save(flags);
1028         rtsdtr_ctrl(info->MCR);
1029         local_irq_restore(flags);
1030 }
1031
1032 static void rs_unthrottle(struct tty_struct * tty)
1033 {
1034         struct async_struct *info = tty->driver_data;
1035         unsigned long flags;
1036 #ifdef SERIAL_DEBUG_THROTTLE
1037         char    buf[64];
1038
1039         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1040                tty->ldisc.chars_in_buffer(tty));
1041 #endif
1042
1043         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1044                 return;
1045
1046         if (I_IXOFF(tty)) {
1047                 if (info->x_char)
1048                         info->x_char = 0;
1049                 else
1050                         rs_send_xchar(tty, START_CHAR(tty));
1051         }
1052         if (tty->termios->c_cflag & CRTSCTS)
1053                 info->MCR |= SER_RTS;
1054         local_irq_save(flags);
1055         rtsdtr_ctrl(info->MCR);
1056         local_irq_restore(flags);
1057 }
1058
1059 /*
1060  * ------------------------------------------------------------
1061  * rs_ioctl() and friends
1062  * ------------------------------------------------------------
1063  */
1064
1065 static int get_serial_info(struct async_struct * info,
1066                            struct serial_struct __user * retinfo)
1067 {
1068         struct serial_struct tmp;
1069         struct serial_state *state = info->state;
1070    
1071         if (!retinfo)
1072                 return -EFAULT;
1073         memset(&tmp, 0, sizeof(tmp));
1074         tty_lock();
1075         tmp.type = state->type;
1076         tmp.line = state->line;
1077         tmp.port = state->port;
1078         tmp.irq = state->irq;
1079         tmp.flags = state->flags;
1080         tmp.xmit_fifo_size = state->xmit_fifo_size;
1081         tmp.baud_base = state->baud_base;
1082         tmp.close_delay = state->close_delay;
1083         tmp.closing_wait = state->closing_wait;
1084         tmp.custom_divisor = state->custom_divisor;
1085         tty_unlock();
1086         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1087                 return -EFAULT;
1088         return 0;
1089 }
1090
1091 static int set_serial_info(struct async_struct * info,
1092                            struct serial_struct __user * new_info)
1093 {
1094         struct serial_struct new_serial;
1095         struct serial_state old_state, *state;
1096         unsigned int            change_irq,change_port;
1097         int                     retval = 0;
1098
1099         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1100                 return -EFAULT;
1101
1102         tty_lock();
1103         state = info->state;
1104         old_state = *state;
1105   
1106         change_irq = new_serial.irq != state->irq;
1107         change_port = (new_serial.port != state->port);
1108         if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
1109           tty_unlock();
1110           return -EINVAL;
1111         }
1112   
1113         if (!serial_isroot()) {
1114                 if ((new_serial.baud_base != state->baud_base) ||
1115                     (new_serial.close_delay != state->close_delay) ||
1116                     (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1117                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1118                      (state->flags & ~ASYNC_USR_MASK)))
1119                         return -EPERM;
1120                 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1121                                (new_serial.flags & ASYNC_USR_MASK));
1122                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1123                                (new_serial.flags & ASYNC_USR_MASK));
1124                 state->custom_divisor = new_serial.custom_divisor;
1125                 goto check_and_exit;
1126         }
1127
1128         if (new_serial.baud_base < 9600) {
1129                 tty_unlock();
1130                 return -EINVAL;
1131         }
1132
1133         /*
1134          * OK, past this point, all the error checking has been done.
1135          * At this point, we start making changes.....
1136          */
1137
1138         state->baud_base = new_serial.baud_base;
1139         state->flags = ((state->flags & ~ASYNC_FLAGS) |
1140                         (new_serial.flags & ASYNC_FLAGS));
1141         info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1142                        (info->flags & ASYNC_INTERNAL_FLAGS));
1143         state->custom_divisor = new_serial.custom_divisor;
1144         state->close_delay = new_serial.close_delay * HZ/100;
1145         state->closing_wait = new_serial.closing_wait * HZ/100;
1146         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1147
1148 check_and_exit:
1149         if (info->flags & ASYNC_INITIALIZED) {
1150                 if (((old_state.flags & ASYNC_SPD_MASK) !=
1151                      (state->flags & ASYNC_SPD_MASK)) ||
1152                     (old_state.custom_divisor != state->custom_divisor)) {
1153                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1154                                 info->tty->alt_speed = 57600;
1155                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1156                                 info->tty->alt_speed = 115200;
1157                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1158                                 info->tty->alt_speed = 230400;
1159                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1160                                 info->tty->alt_speed = 460800;
1161                         change_speed(info, NULL);
1162                 }
1163         } else
1164                 retval = startup(info);
1165         tty_unlock();
1166         return retval;
1167 }
1168
1169
1170 /*
1171  * get_lsr_info - get line status register info
1172  *
1173  * Purpose: Let user call ioctl() to get info when the UART physically
1174  *          is emptied.  On bus types like RS485, the transmitter must
1175  *          release the bus after transmitting. This must be done when
1176  *          the transmit shift register is empty, not be done when the
1177  *          transmit holding register is empty.  This functionality
1178  *          allows an RS485 driver to be written in user space. 
1179  */
1180 static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
1181 {
1182         unsigned char status;
1183         unsigned int result;
1184         unsigned long flags;
1185
1186         local_irq_save(flags);
1187         status = custom.serdatr;
1188         mb();
1189         local_irq_restore(flags);
1190         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1191         if (copy_to_user(value, &result, sizeof(int)))
1192                 return -EFAULT;
1193         return 0;
1194 }
1195
1196
1197 static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1198 {
1199         struct async_struct * info = tty->driver_data;
1200         unsigned char control, status;
1201         unsigned long flags;
1202
1203         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1204                 return -ENODEV;
1205         if (tty->flags & (1 << TTY_IO_ERROR))
1206                 return -EIO;
1207
1208         control = info->MCR;
1209         local_irq_save(flags);
1210         status = ciab.pra;
1211         local_irq_restore(flags);
1212         return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1213                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1214                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1215                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1216                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1217 }
1218
1219 static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1220                        unsigned int set, unsigned int clear)
1221 {
1222         struct async_struct * info = tty->driver_data;
1223         unsigned long flags;
1224
1225         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1226                 return -ENODEV;
1227         if (tty->flags & (1 << TTY_IO_ERROR))
1228                 return -EIO;
1229
1230         local_irq_save(flags);
1231         if (set & TIOCM_RTS)
1232                 info->MCR |= SER_RTS;
1233         if (set & TIOCM_DTR)
1234                 info->MCR |= SER_DTR;
1235         if (clear & TIOCM_RTS)
1236                 info->MCR &= ~SER_RTS;
1237         if (clear & TIOCM_DTR)
1238                 info->MCR &= ~SER_DTR;
1239         rtsdtr_ctrl(info->MCR);
1240         local_irq_restore(flags);
1241         return 0;
1242 }
1243
1244 /*
1245  * rs_break() --- routine which turns the break handling on or off
1246  */
1247 static int rs_break(struct tty_struct *tty, int break_state)
1248 {
1249         struct async_struct * info = tty->driver_data;
1250         unsigned long flags;
1251
1252         if (serial_paranoia_check(info, tty->name, "rs_break"))
1253                 return -EINVAL;
1254
1255         local_irq_save(flags);
1256         if (break_state == -1)
1257           custom.adkcon = AC_SETCLR | AC_UARTBRK;
1258         else
1259           custom.adkcon = AC_UARTBRK;
1260         mb();
1261         local_irq_restore(flags);
1262         return 0;
1263 }
1264
1265 /*
1266  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1267  * Return: write counters to the user passed counter struct
1268  * NB: both 1->0 and 0->1 transitions are counted except for
1269  *     RI where only 0->1 is counted.
1270  */
1271 static int rs_get_icount(struct tty_struct *tty,
1272                                 struct serial_icounter_struct *icount)
1273 {
1274         struct async_struct *info = tty->driver_data;
1275         struct async_icount cnow;
1276         unsigned long flags;
1277
1278         local_irq_save(flags);
1279         cnow = info->state->icount;
1280         local_irq_restore(flags);
1281         icount->cts = cnow.cts;
1282         icount->dsr = cnow.dsr;
1283         icount->rng = cnow.rng;
1284         icount->dcd = cnow.dcd;
1285         icount->rx = cnow.rx;
1286         icount->tx = cnow.tx;
1287         icount->frame = cnow.frame;
1288         icount->overrun = cnow.overrun;
1289         icount->parity = cnow.parity;
1290         icount->brk = cnow.brk;
1291         icount->buf_overrun = cnow.buf_overrun;
1292
1293         return 0;
1294 }
1295
1296 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1297                     unsigned int cmd, unsigned long arg)
1298 {
1299         struct async_struct * info = tty->driver_data;
1300         struct async_icount cprev, cnow;        /* kernel counter temps */
1301         void __user *argp = (void __user *)arg;
1302         unsigned long flags;
1303
1304         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1305                 return -ENODEV;
1306
1307         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1308             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1309             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1310                 if (tty->flags & (1 << TTY_IO_ERROR))
1311                     return -EIO;
1312         }
1313
1314         switch (cmd) {
1315                 case TIOCGSERIAL:
1316                         return get_serial_info(info, argp);
1317                 case TIOCSSERIAL:
1318                         return set_serial_info(info, argp);
1319                 case TIOCSERCONFIG:
1320                         return 0;
1321
1322                 case TIOCSERGETLSR: /* Get line status register */
1323                         return get_lsr_info(info, argp);
1324
1325                 case TIOCSERGSTRUCT:
1326                         if (copy_to_user(argp,
1327                                          info, sizeof(struct async_struct)))
1328                                 return -EFAULT;
1329                         return 0;
1330
1331                 /*
1332                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1333                  * - mask passed in arg for lines of interest
1334                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1335                  * Caller should use TIOCGICOUNT to see which one it was
1336                  */
1337                 case TIOCMIWAIT:
1338                         local_irq_save(flags);
1339                         /* note the counters on entry */
1340                         cprev = info->state->icount;
1341                         local_irq_restore(flags);
1342                         while (1) {
1343                                 interruptible_sleep_on(&info->delta_msr_wait);
1344                                 /* see if a signal did it */
1345                                 if (signal_pending(current))
1346                                         return -ERESTARTSYS;
1347                                 local_irq_save(flags);
1348                                 cnow = info->state->icount; /* atomic copy */
1349                                 local_irq_restore(flags);
1350                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 
1351                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1352                                         return -EIO; /* no change => error */
1353                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1354                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1355                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1356                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1357                                         return 0;
1358                                 }
1359                                 cprev = cnow;
1360                         }
1361                         /* NOTREACHED */
1362
1363                 case TIOCSERGWILD:
1364                 case TIOCSERSWILD:
1365                         /* "setserial -W" is called in Debian boot */
1366                         printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1367                         return 0;
1368
1369                 default:
1370                         return -ENOIOCTLCMD;
1371                 }
1372         return 0;
1373 }
1374
1375 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1376 {
1377         struct async_struct *info = tty->driver_data;
1378         unsigned long flags;
1379         unsigned int cflag = tty->termios->c_cflag;
1380
1381         change_speed(info, old_termios);
1382
1383         /* Handle transition to B0 status */
1384         if ((old_termios->c_cflag & CBAUD) &&
1385             !(cflag & CBAUD)) {
1386                 info->MCR &= ~(SER_DTR|SER_RTS);
1387                 local_irq_save(flags);
1388                 rtsdtr_ctrl(info->MCR);
1389                 local_irq_restore(flags);
1390         }
1391
1392         /* Handle transition away from B0 status */
1393         if (!(old_termios->c_cflag & CBAUD) &&
1394             (cflag & CBAUD)) {
1395                 info->MCR |= SER_DTR;
1396                 if (!(tty->termios->c_cflag & CRTSCTS) || 
1397                     !test_bit(TTY_THROTTLED, &tty->flags)) {
1398                         info->MCR |= SER_RTS;
1399                 }
1400                 local_irq_save(flags);
1401                 rtsdtr_ctrl(info->MCR);
1402                 local_irq_restore(flags);
1403         }
1404
1405         /* Handle turning off CRTSCTS */
1406         if ((old_termios->c_cflag & CRTSCTS) &&
1407             !(tty->termios->c_cflag & CRTSCTS)) {
1408                 tty->hw_stopped = 0;
1409                 rs_start(tty);
1410         }
1411
1412 #if 0
1413         /*
1414          * No need to wake up processes in open wait, since they
1415          * sample the CLOCAL flag once, and don't recheck it.
1416          * XXX  It's not clear whether the current behavior is correct
1417          * or not.  Hence, this may change.....
1418          */
1419         if (!(old_termios->c_cflag & CLOCAL) &&
1420             (tty->termios->c_cflag & CLOCAL))
1421                 wake_up_interruptible(&info->open_wait);
1422 #endif
1423 }
1424
1425 /*
1426  * ------------------------------------------------------------
1427  * rs_close()
1428  * 
1429  * This routine is called when the serial port gets closed.  First, we
1430  * wait for the last remaining data to be sent.  Then, we unlink its
1431  * async structure from the interrupt chain if necessary, and we free
1432  * that IRQ if nothing is left in the chain.
1433  * ------------------------------------------------------------
1434  */
1435 static void rs_close(struct tty_struct *tty, struct file * filp)
1436 {
1437         struct async_struct * info = tty->driver_data;
1438         struct serial_state *state;
1439         unsigned long flags;
1440
1441         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1442                 return;
1443
1444         state = info->state;
1445
1446         local_irq_save(flags);
1447
1448         if (tty_hung_up_p(filp)) {
1449                 DBG_CNT("before DEC-hung");
1450                 local_irq_restore(flags);
1451                 return;
1452         }
1453
1454 #ifdef SERIAL_DEBUG_OPEN
1455         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1456 #endif
1457         if ((tty->count == 1) && (state->count != 1)) {
1458                 /*
1459                  * Uh, oh.  tty->count is 1, which means that the tty
1460                  * structure will be freed.  state->count should always
1461                  * be one in these conditions.  If it's greater than
1462                  * one, we've got real problems, since it means the
1463                  * serial port won't be shutdown.
1464                  */
1465                 printk("rs_close: bad serial port count; tty->count is 1, "
1466                        "state->count is %d\n", state->count);
1467                 state->count = 1;
1468         }
1469         if (--state->count < 0) {
1470                 printk("rs_close: bad serial port count for ttys%d: %d\n",
1471                        info->line, state->count);
1472                 state->count = 0;
1473         }
1474         if (state->count) {
1475                 DBG_CNT("before DEC-2");
1476                 local_irq_restore(flags);
1477                 return;
1478         }
1479         info->flags |= ASYNC_CLOSING;
1480         /*
1481          * Now we wait for the transmit buffer to clear; and we notify 
1482          * the line discipline to only process XON/XOFF characters.
1483          */
1484         tty->closing = 1;
1485         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1486                 tty_wait_until_sent(tty, info->closing_wait);
1487         /*
1488          * At this point we stop accepting input.  To do this, we
1489          * disable the receive line status interrupts, and tell the
1490          * interrupt driver to stop checking the data ready bit in the
1491          * line status register.
1492          */
1493         info->read_status_mask &= ~UART_LSR_DR;
1494         if (info->flags & ASYNC_INITIALIZED) {
1495                 /* disable receive interrupts */
1496                 custom.intena = IF_RBF;
1497                 mb();
1498                 /* clear any pending receive interrupt */
1499                 custom.intreq = IF_RBF;
1500                 mb();
1501
1502                 /*
1503                  * Before we drop DTR, make sure the UART transmitter
1504                  * has completely drained; this is especially
1505                  * important if there is a transmit FIFO!
1506                  */
1507                 rs_wait_until_sent(tty, info->timeout);
1508         }
1509         shutdown(info);
1510         rs_flush_buffer(tty);
1511                 
1512         tty_ldisc_flush(tty);
1513         tty->closing = 0;
1514         info->event = 0;
1515         info->tty = NULL;
1516         if (info->blocked_open) {
1517                 if (info->close_delay) {
1518                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1519                 }
1520                 wake_up_interruptible(&info->open_wait);
1521         }
1522         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1523         wake_up_interruptible(&info->close_wait);
1524         local_irq_restore(flags);
1525 }
1526
1527 /*
1528  * rs_wait_until_sent() --- wait until the transmitter is empty
1529  */
1530 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1531 {
1532         struct async_struct * info = tty->driver_data;
1533         unsigned long orig_jiffies, char_time;
1534         int tty_was_locked = tty_locked();
1535         int lsr;
1536
1537         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1538                 return;
1539
1540         if (info->xmit_fifo_size == 0)
1541                 return; /* Just in case.... */
1542
1543         orig_jiffies = jiffies;
1544
1545         /*
1546          * tty_wait_until_sent is called from lots of places,
1547          * with or without the BTM.
1548          */
1549         if (!tty_was_locked)
1550                 tty_lock();
1551         /*
1552          * Set the check interval to be 1/5 of the estimated time to
1553          * send a single character, and make it at least 1.  The check
1554          * interval should also be less than the timeout.
1555          * 
1556          * Note: we have to use pretty tight timings here to satisfy
1557          * the NIST-PCTS.
1558          */
1559         char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1560         char_time = char_time / 5;
1561         if (char_time == 0)
1562                 char_time = 1;
1563         if (timeout)
1564           char_time = min_t(unsigned long, char_time, timeout);
1565         /*
1566          * If the transmitter hasn't cleared in twice the approximate
1567          * amount of time to send the entire FIFO, it probably won't
1568          * ever clear.  This assumes the UART isn't doing flow
1569          * control, which is currently the case.  Hence, if it ever
1570          * takes longer than info->timeout, this is probably due to a
1571          * UART bug of some kind.  So, we clamp the timeout parameter at
1572          * 2*info->timeout.
1573          */
1574         if (!timeout || timeout > 2*info->timeout)
1575                 timeout = 2*info->timeout;
1576 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1577         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1578         printk("jiff=%lu...", jiffies);
1579 #endif
1580         while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1581 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1582                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1583 #endif
1584                 msleep_interruptible(jiffies_to_msecs(char_time));
1585                 if (signal_pending(current))
1586                         break;
1587                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1588                         break;
1589         }
1590         __set_current_state(TASK_RUNNING);
1591         if (!tty_was_locked)
1592                 tty_unlock();
1593 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1594         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1595 #endif
1596 }
1597
1598 /*
1599  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1600  */
1601 static void rs_hangup(struct tty_struct *tty)
1602 {
1603         struct async_struct * info = tty->driver_data;
1604         struct serial_state *state = info->state;
1605
1606         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1607                 return;
1608
1609         state = info->state;
1610
1611         rs_flush_buffer(tty);
1612         shutdown(info);
1613         info->event = 0;
1614         state->count = 0;
1615         info->flags &= ~ASYNC_NORMAL_ACTIVE;
1616         info->tty = NULL;
1617         wake_up_interruptible(&info->open_wait);
1618 }
1619
1620 /*
1621  * ------------------------------------------------------------
1622  * rs_open() and friends
1623  * ------------------------------------------------------------
1624  */
1625 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1626                            struct async_struct *info)
1627 {
1628 #ifdef DECLARE_WAITQUEUE
1629         DECLARE_WAITQUEUE(wait, current);
1630 #else
1631         struct wait_queue wait = { current, NULL };
1632 #endif
1633         struct serial_state *state = info->state;
1634         int             retval;
1635         int             do_clocal = 0, extra_count = 0;
1636         unsigned long   flags;
1637
1638         /*
1639          * If the device is in the middle of being closed, then block
1640          * until it's done, and then try again.
1641          */
1642         if (tty_hung_up_p(filp) ||
1643             (info->flags & ASYNC_CLOSING)) {
1644                 if (info->flags & ASYNC_CLOSING)
1645                         interruptible_sleep_on(&info->close_wait);
1646 #ifdef SERIAL_DO_RESTART
1647                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1648                         -EAGAIN : -ERESTARTSYS);
1649 #else
1650                 return -EAGAIN;
1651 #endif
1652         }
1653
1654         /*
1655          * If non-blocking mode is set, or the port is not enabled,
1656          * then make the check up front and then exit.
1657          */
1658         if ((filp->f_flags & O_NONBLOCK) ||
1659             (tty->flags & (1 << TTY_IO_ERROR))) {
1660                 info->flags |= ASYNC_NORMAL_ACTIVE;
1661                 return 0;
1662         }
1663
1664         if (tty->termios->c_cflag & CLOCAL)
1665                 do_clocal = 1;
1666
1667         /*
1668          * Block waiting for the carrier detect and the line to become
1669          * free (i.e., not in use by the callout).  While we are in
1670          * this loop, state->count is dropped by one, so that
1671          * rs_close() knows when to free things.  We restore it upon
1672          * exit, either normal or abnormal.
1673          */
1674         retval = 0;
1675         add_wait_queue(&info->open_wait, &wait);
1676 #ifdef SERIAL_DEBUG_OPEN
1677         printk("block_til_ready before block: ttys%d, count = %d\n",
1678                state->line, state->count);
1679 #endif
1680         local_irq_save(flags);
1681         if (!tty_hung_up_p(filp)) {
1682                 extra_count = 1;
1683                 state->count--;
1684         }
1685         local_irq_restore(flags);
1686         info->blocked_open++;
1687         while (1) {
1688                 local_irq_save(flags);
1689                 if (tty->termios->c_cflag & CBAUD)
1690                         rtsdtr_ctrl(SER_DTR|SER_RTS);
1691                 local_irq_restore(flags);
1692                 set_current_state(TASK_INTERRUPTIBLE);
1693                 if (tty_hung_up_p(filp) ||
1694                     !(info->flags & ASYNC_INITIALIZED)) {
1695 #ifdef SERIAL_DO_RESTART
1696                         if (info->flags & ASYNC_HUP_NOTIFY)
1697                                 retval = -EAGAIN;
1698                         else
1699                                 retval = -ERESTARTSYS;
1700 #else
1701                         retval = -EAGAIN;
1702 #endif
1703                         break;
1704                 }
1705                 if (!(info->flags & ASYNC_CLOSING) &&
1706                     (do_clocal || (!(ciab.pra & SER_DCD)) ))
1707                         break;
1708                 if (signal_pending(current)) {
1709                         retval = -ERESTARTSYS;
1710                         break;
1711                 }
1712 #ifdef SERIAL_DEBUG_OPEN
1713                 printk("block_til_ready blocking: ttys%d, count = %d\n",
1714                        info->line, state->count);
1715 #endif
1716                 tty_unlock();
1717                 schedule();
1718                 tty_lock();
1719         }
1720         __set_current_state(TASK_RUNNING);
1721         remove_wait_queue(&info->open_wait, &wait);
1722         if (extra_count)
1723                 state->count++;
1724         info->blocked_open--;
1725 #ifdef SERIAL_DEBUG_OPEN
1726         printk("block_til_ready after blocking: ttys%d, count = %d\n",
1727                info->line, state->count);
1728 #endif
1729         if (retval)
1730                 return retval;
1731         info->flags |= ASYNC_NORMAL_ACTIVE;
1732         return 0;
1733 }
1734
1735 static int get_async_struct(int line, struct async_struct **ret_info)
1736 {
1737         struct async_struct *info;
1738         struct serial_state *sstate;
1739
1740         sstate = rs_table + line;
1741         sstate->count++;
1742         if (sstate->info) {
1743                 *ret_info = sstate->info;
1744                 return 0;
1745         }
1746         info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1747         if (!info) {
1748                 sstate->count--;
1749                 return -ENOMEM;
1750         }
1751 #ifdef DECLARE_WAITQUEUE
1752         init_waitqueue_head(&info->open_wait);
1753         init_waitqueue_head(&info->close_wait);
1754         init_waitqueue_head(&info->delta_msr_wait);
1755 #endif
1756         info->magic = SERIAL_MAGIC;
1757         info->port = sstate->port;
1758         info->flags = sstate->flags;
1759         info->xmit_fifo_size = sstate->xmit_fifo_size;
1760         info->line = line;
1761         tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1762         info->state = sstate;
1763         if (sstate->info) {
1764                 kfree(info);
1765                 *ret_info = sstate->info;
1766                 return 0;
1767         }
1768         *ret_info = sstate->info = info;
1769         return 0;
1770 }
1771
1772 /*
1773  * This routine is called whenever a serial port is opened.  It
1774  * enables interrupts for a serial port, linking in its async structure into
1775  * the IRQ chain.   It also performs the serial-specific
1776  * initialization for the tty structure.
1777  */
1778 static int rs_open(struct tty_struct *tty, struct file * filp)
1779 {
1780         struct async_struct     *info;
1781         int                     retval, line;
1782
1783         line = tty->index;
1784         if ((line < 0) || (line >= NR_PORTS)) {
1785                 return -ENODEV;
1786         }
1787         retval = get_async_struct(line, &info);
1788         if (retval) {
1789                 return retval;
1790         }
1791         tty->driver_data = info;
1792         info->tty = tty;
1793         if (serial_paranoia_check(info, tty->name, "rs_open"))
1794                 return -ENODEV;
1795
1796 #ifdef SERIAL_DEBUG_OPEN
1797         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1798 #endif
1799         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1800
1801         /*
1802          * If the port is the middle of closing, bail out now
1803          */
1804         if (tty_hung_up_p(filp) ||
1805             (info->flags & ASYNC_CLOSING)) {
1806                 if (info->flags & ASYNC_CLOSING)
1807                         interruptible_sleep_on(&info->close_wait);
1808 #ifdef SERIAL_DO_RESTART
1809                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1810                         -EAGAIN : -ERESTARTSYS);
1811 #else
1812                 return -EAGAIN;
1813 #endif
1814         }
1815
1816         /*
1817          * Start up serial port
1818          */
1819         retval = startup(info);
1820         if (retval) {
1821                 return retval;
1822         }
1823
1824         retval = block_til_ready(tty, filp, info);
1825         if (retval) {
1826 #ifdef SERIAL_DEBUG_OPEN
1827                 printk("rs_open returning after block_til_ready with %d\n",
1828                        retval);
1829 #endif
1830                 return retval;
1831         }
1832
1833 #ifdef SERIAL_DEBUG_OPEN
1834         printk("rs_open %s successful...", tty->name);
1835 #endif
1836         return 0;
1837 }
1838
1839 /*
1840  * /proc fs routines....
1841  */
1842
1843 static inline void line_info(struct seq_file *m, struct serial_state *state)
1844 {
1845         struct async_struct *info = state->info, scr_info;
1846         char    stat_buf[30], control, status;
1847         unsigned long flags;
1848
1849         seq_printf(m, "%d: uart:amiga_builtin",state->line);
1850
1851         /*
1852          * Figure out the current RS-232 lines
1853          */
1854         if (!info) {
1855                 info = &scr_info;       /* This is just for serial_{in,out} */
1856
1857                 info->magic = SERIAL_MAGIC;
1858                 info->flags = state->flags;
1859                 info->quot = 0;
1860                 info->tty = NULL;
1861         }
1862         local_irq_save(flags);
1863         status = ciab.pra;
1864         control = info ? info->MCR : status;
1865         local_irq_restore(flags);
1866
1867         stat_buf[0] = 0;
1868         stat_buf[1] = 0;
1869         if(!(control & SER_RTS))
1870                 strcat(stat_buf, "|RTS");
1871         if(!(status & SER_CTS))
1872                 strcat(stat_buf, "|CTS");
1873         if(!(control & SER_DTR))
1874                 strcat(stat_buf, "|DTR");
1875         if(!(status & SER_DSR))
1876                 strcat(stat_buf, "|DSR");
1877         if(!(status & SER_DCD))
1878                 strcat(stat_buf, "|CD");
1879
1880         if (info->quot) {
1881                 seq_printf(m, " baud:%d", state->baud_base / info->quot);
1882         }
1883
1884         seq_printf(m, " tx:%d rx:%d", state->icount.tx, state->icount.rx);
1885
1886         if (state->icount.frame)
1887                 seq_printf(m, " fe:%d", state->icount.frame);
1888
1889         if (state->icount.parity)
1890                 seq_printf(m, " pe:%d", state->icount.parity);
1891
1892         if (state->icount.brk)
1893                 seq_printf(m, " brk:%d", state->icount.brk);
1894
1895         if (state->icount.overrun)
1896                 seq_printf(m, " oe:%d", state->icount.overrun);
1897
1898         /*
1899          * Last thing is the RS-232 status lines
1900          */
1901         seq_printf(m, " %s\n", stat_buf+1);
1902 }
1903
1904 static int rs_proc_show(struct seq_file *m, void *v)
1905 {
1906         seq_printf(m, "serinfo:1.0 driver:%s\n", serial_version);
1907         line_info(m, &rs_table[0]);
1908         return 0;
1909 }
1910
1911 static int rs_proc_open(struct inode *inode, struct file *file)
1912 {
1913         return single_open(file, rs_proc_show, NULL);
1914 }
1915
1916 static const struct file_operations rs_proc_fops = {
1917         .owner          = THIS_MODULE,
1918         .open           = rs_proc_open,
1919         .read           = seq_read,
1920         .llseek         = seq_lseek,
1921         .release        = single_release,
1922 };
1923
1924 /*
1925  * ---------------------------------------------------------------------
1926  * rs_init() and friends
1927  *
1928  * rs_init() is called at boot-time to initialize the serial driver.
1929  * ---------------------------------------------------------------------
1930  */
1931
1932 /*
1933  * This routine prints out the appropriate serial driver version
1934  * number, and identifies which options were configured into this
1935  * driver.
1936  */
1937 static void show_serial_version(void)
1938 {
1939         printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1940 }
1941
1942
1943 static const struct tty_operations serial_ops = {
1944         .open = rs_open,
1945         .close = rs_close,
1946         .write = rs_write,
1947         .put_char = rs_put_char,
1948         .flush_chars = rs_flush_chars,
1949         .write_room = rs_write_room,
1950         .chars_in_buffer = rs_chars_in_buffer,
1951         .flush_buffer = rs_flush_buffer,
1952         .ioctl = rs_ioctl,
1953         .throttle = rs_throttle,
1954         .unthrottle = rs_unthrottle,
1955         .set_termios = rs_set_termios,
1956         .stop = rs_stop,
1957         .start = rs_start,
1958         .hangup = rs_hangup,
1959         .break_ctl = rs_break,
1960         .send_xchar = rs_send_xchar,
1961         .wait_until_sent = rs_wait_until_sent,
1962         .tiocmget = rs_tiocmget,
1963         .tiocmset = rs_tiocmset,
1964         .get_icount = rs_get_icount,
1965         .proc_fops = &rs_proc_fops,
1966 };
1967
1968 /*
1969  * The serial driver boot-time initialization code!
1970  */
1971 static int __init amiga_serial_probe(struct platform_device *pdev)
1972 {
1973         unsigned long flags;
1974         struct serial_state * state;
1975         int error;
1976
1977         serial_driver = alloc_tty_driver(1);
1978         if (!serial_driver)
1979                 return -ENOMEM;
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         error = tty_register_driver(serial_driver);
2001         if (error)
2002                 goto fail_put_tty_driver;
2003
2004         state = rs_table;
2005         state->magic = SSTATE_MAGIC;
2006         state->port = (int)&custom.serdatr; /* Just to give it a value */
2007         state->line = 0;
2008         state->custom_divisor = 0;
2009         state->close_delay = 5*HZ/10;
2010         state->closing_wait = 30*HZ;
2011         state->icount.cts = state->icount.dsr = 
2012           state->icount.rng = state->icount.dcd = 0;
2013         state->icount.rx = state->icount.tx = 0;
2014         state->icount.frame = state->icount.parity = 0;
2015         state->icount.overrun = state->icount.brk = 0;
2016
2017         printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2018                        state->line);
2019
2020         /* Hardware set up */
2021
2022         state->baud_base = amiga_colorclock;
2023         state->xmit_fifo_size = 1;
2024
2025         /* set ISRs, and then disable the rx interrupts */
2026         error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2027         if (error)
2028                 goto fail_unregister;
2029
2030         error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED,
2031                             "serial RX", state);
2032         if (error)
2033                 goto fail_free_irq;
2034
2035         local_irq_save(flags);
2036
2037         /* turn off Rx and Tx interrupts */
2038         custom.intena = IF_RBF | IF_TBE;
2039         mb();
2040
2041         /* clear any pending interrupt */
2042         custom.intreq = IF_RBF | IF_TBE;
2043         mb();
2044
2045         local_irq_restore(flags);
2046
2047         /*
2048          * set the appropriate directions for the modem control flags,
2049          * and clear RTS and DTR
2050          */
2051         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
2052         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
2053
2054         platform_set_drvdata(pdev, state);
2055
2056         return 0;
2057
2058 fail_free_irq:
2059         free_irq(IRQ_AMIGA_TBE, state);
2060 fail_unregister:
2061         tty_unregister_driver(serial_driver);
2062 fail_put_tty_driver:
2063         put_tty_driver(serial_driver);
2064         return error;
2065 }
2066
2067 static int __exit amiga_serial_remove(struct platform_device *pdev)
2068 {
2069         int error;
2070         struct serial_state *state = platform_get_drvdata(pdev);
2071         struct async_struct *info = state->info;
2072
2073         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2074         tasklet_kill(&info->tlet);
2075         if ((error = tty_unregister_driver(serial_driver)))
2076                 printk("SERIAL: failed to unregister serial driver (%d)\n",
2077                        error);
2078         put_tty_driver(serial_driver);
2079
2080         rs_table[0].info = NULL;
2081         kfree(info);
2082
2083         free_irq(IRQ_AMIGA_TBE, rs_table);
2084         free_irq(IRQ_AMIGA_RBF, rs_table);
2085
2086         platform_set_drvdata(pdev, NULL);
2087
2088         return error;
2089 }
2090
2091 static struct platform_driver amiga_serial_driver = {
2092         .remove = __exit_p(amiga_serial_remove),
2093         .driver   = {
2094                 .name   = "amiga-serial",
2095                 .owner  = THIS_MODULE,
2096         },
2097 };
2098
2099 static int __init amiga_serial_init(void)
2100 {
2101         return platform_driver_probe(&amiga_serial_driver, amiga_serial_probe);
2102 }
2103
2104 module_init(amiga_serial_init);
2105
2106 static void __exit amiga_serial_exit(void)
2107 {
2108         platform_driver_unregister(&amiga_serial_driver);
2109 }
2110
2111 module_exit(amiga_serial_exit);
2112
2113
2114 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
2115
2116 /*
2117  * ------------------------------------------------------------
2118  * Serial console driver
2119  * ------------------------------------------------------------
2120  */
2121
2122 static void amiga_serial_putc(char c)
2123 {
2124         custom.serdat = (unsigned char)c | 0x100;
2125         while (!(custom.serdatr & 0x2000))
2126                 barrier();
2127 }
2128
2129 /*
2130  *      Print a string to the serial port trying not to disturb
2131  *      any possible real use of the port...
2132  *
2133  *      The console must be locked when we get here.
2134  */
2135 static void serial_console_write(struct console *co, const char *s,
2136                                 unsigned count)
2137 {
2138         unsigned short intena = custom.intenar;
2139
2140         custom.intena = IF_TBE;
2141
2142         while (count--) {
2143                 if (*s == '\n')
2144                         amiga_serial_putc('\r');
2145                 amiga_serial_putc(*s++);
2146         }
2147
2148         custom.intena = IF_SETCLR | (intena & IF_TBE);
2149 }
2150
2151 static struct tty_driver *serial_console_device(struct console *c, int *index)
2152 {
2153         *index = 0;
2154         return serial_driver;
2155 }
2156
2157 static struct console sercons = {
2158         .name =         "ttyS",
2159         .write =        serial_console_write,
2160         .device =       serial_console_device,
2161         .flags =        CON_PRINTBUFFER,
2162         .index =        -1,
2163 };
2164
2165 /*
2166  *      Register console.
2167  */
2168 static int __init amiserial_console_init(void)
2169 {
2170         register_console(&sercons);
2171         return 0;
2172 }
2173 console_initcall(amiserial_console_init);
2174
2175 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
2176
2177 MODULE_LICENSE("GPL");
2178 MODULE_ALIAS("platform:amiga-serial");