[SCSI] aic7xxx: remove the completeq
[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/config.h>
35 #include <linux/delay.h>
36
37 #undef SERIAL_PARANOIA_CHECK
38 #define SERIAL_DO_RESTART
39
40 /* Set of debugging defines */
41
42 #undef SERIAL_DEBUG_INTR
43 #undef SERIAL_DEBUG_OPEN
44 #undef SERIAL_DEBUG_FLOW
45 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
46
47 /* Sanity checks */
48
49 #define SERIAL_INLINE
50   
51 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
52 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
53  tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
54 #else
55 #define DBG_CNT(s)
56 #endif
57
58 /*
59  * End of serial driver configuration section.
60  */
61
62 #include <linux/module.h>
63
64 #include <linux/types.h>
65 #include <linux/serial.h>
66 #include <linux/serialP.h>
67 #include <linux/serial_reg.h>
68 static char *serial_version = "4.30";
69
70 #include <linux/errno.h>
71 #include <linux/signal.h>
72 #include <linux/sched.h>
73 #include <linux/kernel.h>
74 #include <linux/timer.h>
75 #include <linux/interrupt.h>
76 #include <linux/tty.h>
77 #include <linux/tty_flip.h>
78 #include <linux/console.h>
79 #include <linux/major.h>
80 #include <linux/string.h>
81 #include <linux/fcntl.h>
82 #include <linux/ptrace.h>
83 #include <linux/ioport.h>
84 #include <linux/mm.h>
85 #include <linux/slab.h>
86 #include <linux/init.h>
87 #include <linux/bitops.h>
88
89 #include <asm/setup.h>
90
91 #include <asm/system.h>
92
93 #include <asm/irq.h>
94
95 #include <asm/amigahw.h>
96 #include <asm/amigaints.h>
97
98 #ifdef SERIAL_INLINE
99 #define _INLINE_ inline
100 #endif
101
102 static char *serial_name = "Amiga-builtin serial driver";
103
104 static struct tty_driver *serial_driver;
105
106 /* number of characters left in xmit buffer before we ask for more */
107 #define WAKEUP_CHARS 256
108
109 static struct async_struct *IRQ_ports;
110
111 static unsigned char current_ctl_bits;
112
113 static void change_speed(struct async_struct *info, struct termios *old);
114 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
115
116
117 static struct serial_state rs_table[1];
118
119 #define NR_PORTS        (sizeof(rs_table)/sizeof(struct serial_state))
120
121 /*
122  * tmp_buf is used as a temporary buffer by serial_write.  We need to
123  * lock it in case the copy_from_user blocks while swapping in a page,
124  * and some other program tries to do a serial write at the same time.
125  * Since the lock will only come under contention when the system is
126  * swapping and available memory is low, it makes sense to share one
127  * buffer across all the serial ports, since it significantly saves
128  * memory if large numbers of serial ports are open.
129  */
130 static unsigned char *tmp_buf;
131 static DECLARE_MUTEX(tmp_buf_sem);
132
133 #include <asm/uaccess.h>
134
135 #define serial_isroot() (capable(CAP_SYS_ADMIN))
136
137
138 static inline int serial_paranoia_check(struct async_struct *info,
139                                         char *name, const char *routine)
140 {
141 #ifdef SERIAL_PARANOIA_CHECK
142         static const char *badmagic =
143                 "Warning: bad magic number for serial struct (%s) in %s\n";
144         static const char *badinfo =
145                 "Warning: null async_struct for (%s) in %s\n";
146
147         if (!info) {
148                 printk(badinfo, name, routine);
149                 return 1;
150         }
151         if (info->magic != SERIAL_MAGIC) {
152                 printk(badmagic, name, routine);
153                 return 1;
154         }
155 #endif
156         return 0;
157 }
158
159 /* some serial hardware definitions */
160 #define SDR_OVRUN   (1<<15)
161 #define SDR_RBF     (1<<14)
162 #define SDR_TBE     (1<<13)
163 #define SDR_TSRE    (1<<12)
164
165 #define SERPER_PARENB    (1<<15)
166
167 #define AC_SETCLR   (1<<15)
168 #define AC_UARTBRK  (1<<11)
169
170 #define SER_DTR     (1<<7)
171 #define SER_RTS     (1<<6)
172 #define SER_DCD     (1<<5)
173 #define SER_CTS     (1<<4)
174 #define SER_DSR     (1<<3)
175
176 static __inline__ void rtsdtr_ctrl(int bits)
177 {
178     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
179 }
180
181 /*
182  * ------------------------------------------------------------
183  * rs_stop() and rs_start()
184  *
185  * This routines are called before setting or resetting tty->stopped.
186  * They enable or disable transmitter interrupts, as necessary.
187  * ------------------------------------------------------------
188  */
189 static void rs_stop(struct tty_struct *tty)
190 {
191         struct async_struct *info = (struct async_struct *)tty->driver_data;
192         unsigned long flags;
193
194         if (serial_paranoia_check(info, tty->name, "rs_stop"))
195                 return;
196
197         local_irq_save(flags);
198         if (info->IER & UART_IER_THRI) {
199                 info->IER &= ~UART_IER_THRI;
200                 /* disable Tx interrupt and remove any pending interrupts */
201                 custom.intena = IF_TBE;
202                 mb();
203                 custom.intreq = IF_TBE;
204                 mb();
205         }
206         local_irq_restore(flags);
207 }
208
209 static void rs_start(struct tty_struct *tty)
210 {
211         struct async_struct *info = (struct async_struct *)tty->driver_data;
212         unsigned long flags;
213
214         if (serial_paranoia_check(info, tty->name, "rs_start"))
215                 return;
216
217         local_irq_save(flags);
218         if (info->xmit.head != info->xmit.tail
219             && info->xmit.buf
220             && !(info->IER & UART_IER_THRI)) {
221                 info->IER |= UART_IER_THRI;
222                 custom.intena = IF_SETCLR | IF_TBE;
223                 mb();
224                 /* set a pending Tx Interrupt, transmitter should restart now */
225                 custom.intreq = IF_SETCLR | IF_TBE;
226                 mb();
227         }
228         local_irq_restore(flags);
229 }
230
231 /*
232  * ----------------------------------------------------------------------
233  *
234  * Here starts the interrupt handling routines.  All of the following
235  * subroutines are declared as inline and are folded into
236  * rs_interrupt().  They were separated out for readability's sake.
237  *
238  * Note: rs_interrupt() is a "fast" interrupt, which means that it
239  * runs with interrupts turned off.  People who may want to modify
240  * rs_interrupt() should try to keep the interrupt handler as fast as
241  * possible.  After you are done making modifications, it is not a bad
242  * idea to do:
243  * 
244  * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
245  *
246  * and look at the resulting assemble code in serial.s.
247  *
248  *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
249  * -----------------------------------------------------------------------
250  */
251
252 /*
253  * This routine is used by the interrupt handler to schedule
254  * processing in the software interrupt portion of the driver.
255  */
256 static _INLINE_ void rs_sched_event(struct async_struct *info,
257                                   int event)
258 {
259         info->event |= 1 << event;
260         tasklet_schedule(&info->tlet);
261 }
262
263 static _INLINE_ void receive_chars(struct async_struct *info)
264 {
265         int status;
266         int serdatr;
267         struct tty_struct *tty = info->tty;
268         unsigned char ch;
269         struct  async_icount *icount;
270
271         icount = &info->state->icount;
272
273         status = UART_LSR_DR; /* We obviously have a character! */
274         serdatr = custom.serdatr;
275         mb();
276         custom.intreq = IF_RBF;
277         mb();
278
279         if((serdatr & 0x1ff) == 0)
280             status |= UART_LSR_BI;
281         if(serdatr & SDR_OVRUN)
282             status |= UART_LSR_OE;
283
284         ch = serdatr & 0xff;
285         if (tty->flip.count >= TTY_FLIPBUF_SIZE)
286           goto ignore_char;
287         *tty->flip.char_buf_ptr = ch;
288         icount->rx++;
289
290 #ifdef SERIAL_DEBUG_INTR
291         printk("DR%02x:%02x...", ch, status);
292 #endif
293         *tty->flip.flag_buf_ptr = 0;
294
295         /*
296          * We don't handle parity or frame errors - but I have left
297          * the code in, since I'm not sure that the errors can't be
298          * detected.
299          */
300
301         if (status & (UART_LSR_BI | UART_LSR_PE |
302                       UART_LSR_FE | UART_LSR_OE)) {
303           /*
304            * For statistics only
305            */
306           if (status & UART_LSR_BI) {
307             status &= ~(UART_LSR_FE | UART_LSR_PE);
308             icount->brk++;
309           } else if (status & UART_LSR_PE)
310             icount->parity++;
311           else if (status & UART_LSR_FE)
312             icount->frame++;
313           if (status & UART_LSR_OE)
314             icount->overrun++;
315
316           /*
317            * Now check to see if character should be
318            * ignored, and mask off conditions which
319            * should be ignored.
320            */
321           if (status & info->ignore_status_mask)
322             goto ignore_char;
323
324           status &= info->read_status_mask;
325
326           if (status & (UART_LSR_BI)) {
327 #ifdef SERIAL_DEBUG_INTR
328             printk("handling break....");
329 #endif
330             *tty->flip.flag_buf_ptr = TTY_BREAK;
331             if (info->flags & ASYNC_SAK)
332               do_SAK(tty);
333           } else if (status & UART_LSR_PE)
334             *tty->flip.flag_buf_ptr = TTY_PARITY;
335           else if (status & UART_LSR_FE)
336             *tty->flip.flag_buf_ptr = TTY_FRAME;
337           if (status & UART_LSR_OE) {
338             /*
339              * Overrun is special, since it's
340              * reported immediately, and doesn't
341              * affect the current character
342              */
343             if (tty->flip.count < TTY_FLIPBUF_SIZE) {
344               tty->flip.count++;
345               tty->flip.flag_buf_ptr++;
346               tty->flip.char_buf_ptr++;
347               *tty->flip.flag_buf_ptr = TTY_OVERRUN;
348             }
349           }
350         }
351         tty->flip.flag_buf_ptr++;
352         tty->flip.char_buf_ptr++;
353         tty->flip.count++;
354  ignore_char:
355
356         tty_flip_buffer_push(tty);
357 }
358
359 static _INLINE_ void transmit_chars(struct async_struct *info)
360 {
361         custom.intreq = IF_TBE;
362         mb();
363         if (info->x_char) {
364                 custom.serdat = info->x_char | 0x100;
365                 mb();
366                 info->state->icount.tx++;
367                 info->x_char = 0;
368                 return;
369         }
370         if (info->xmit.head == info->xmit.tail
371             || info->tty->stopped
372             || info->tty->hw_stopped) {
373                 info->IER &= ~UART_IER_THRI;
374                 custom.intena = IF_TBE;
375                 mb();
376                 return;
377         }
378
379         custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
380         mb();
381         info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
382         info->state->icount.tx++;
383
384         if (CIRC_CNT(info->xmit.head,
385                      info->xmit.tail,
386                      SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
387                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
388
389 #ifdef SERIAL_DEBUG_INTR
390         printk("THRE...");
391 #endif
392         if (info->xmit.head == info->xmit.tail) {
393                 custom.intena = IF_TBE;
394                 mb();
395                 info->IER &= ~UART_IER_THRI;
396         }
397 }
398
399 static _INLINE_ void check_modem_status(struct async_struct *info)
400 {
401         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
402         unsigned char dstatus;
403         struct  async_icount *icount;
404
405         /* Determine bits that have changed */
406         dstatus = status ^ current_ctl_bits;
407         current_ctl_bits = status;
408
409         if (dstatus) {
410                 icount = &info->state->icount;
411                 /* update input line counters */
412                 if (dstatus & SER_DSR)
413                         icount->dsr++;
414                 if (dstatus & SER_DCD) {
415                         icount->dcd++;
416 #ifdef CONFIG_HARD_PPS
417                         if ((info->flags & ASYNC_HARDPPS_CD) &&
418                             !(status & SER_DCD))
419                                 hardpps();
420 #endif
421                 }
422                 if (dstatus & SER_CTS)
423                         icount->cts++;
424                 wake_up_interruptible(&info->delta_msr_wait);
425         }
426
427         if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
428 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
429                 printk("ttyS%d CD now %s...", info->line,
430                        (!(status & SER_DCD)) ? "on" : "off");
431 #endif
432                 if (!(status & SER_DCD))
433                         wake_up_interruptible(&info->open_wait);
434                 else {
435 #ifdef SERIAL_DEBUG_OPEN
436                         printk("doing serial hangup...");
437 #endif
438                         if (info->tty)
439                                 tty_hangup(info->tty);
440                 }
441         }
442         if (info->flags & ASYNC_CTS_FLOW) {
443                 if (info->tty->hw_stopped) {
444                         if (!(status & SER_CTS)) {
445 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
446                                 printk("CTS tx start...");
447 #endif
448                                 info->tty->hw_stopped = 0;
449                                 info->IER |= UART_IER_THRI;
450                                 custom.intena = IF_SETCLR | IF_TBE;
451                                 mb();
452                                 /* set a pending Tx Interrupt, transmitter should restart now */
453                                 custom.intreq = IF_SETCLR | IF_TBE;
454                                 mb();
455                                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
456                                 return;
457                         }
458                 } else {
459                         if ((status & SER_CTS)) {
460 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
461                                 printk("CTS tx stop...");
462 #endif
463                                 info->tty->hw_stopped = 1;
464                                 info->IER &= ~UART_IER_THRI;
465                                 /* disable Tx interrupt and remove any pending interrupts */
466                                 custom.intena = IF_TBE;
467                                 mb();
468                                 custom.intreq = IF_TBE;
469                                 mb();
470                         }
471                 }
472         }
473 }
474
475 static irqreturn_t ser_vbl_int( int irq, void *data, struct pt_regs *regs)
476 {
477         /* vbl is just a periodic interrupt we tie into to update modem status */
478         struct async_struct * info = IRQ_ports;
479         /*
480          * TBD - is it better to unregister from this interrupt or to
481          * ignore it if MSI is clear ?
482          */
483         if(info->IER & UART_IER_MSI)
484           check_modem_status(info);
485         return IRQ_HANDLED;
486 }
487
488 static irqreturn_t ser_rx_int(int irq, void *dev_id, struct pt_regs * regs)
489 {
490         struct async_struct * info;
491
492 #ifdef SERIAL_DEBUG_INTR
493         printk("ser_rx_int...");
494 #endif
495
496         info = IRQ_ports;
497         if (!info || !info->tty)
498                 return IRQ_NONE;
499
500         receive_chars(info);
501         info->last_active = jiffies;
502 #ifdef SERIAL_DEBUG_INTR
503         printk("end.\n");
504 #endif
505         return IRQ_HANDLED;
506 }
507
508 static irqreturn_t ser_tx_int(int irq, void *dev_id, struct pt_regs * regs)
509 {
510         struct async_struct * info;
511
512         if (custom.serdatr & SDR_TBE) {
513 #ifdef SERIAL_DEBUG_INTR
514           printk("ser_tx_int...");
515 #endif
516
517           info = IRQ_ports;
518           if (!info || !info->tty)
519                 return IRQ_NONE;
520
521           transmit_chars(info);
522           info->last_active = jiffies;
523 #ifdef SERIAL_DEBUG_INTR
524           printk("end.\n");
525 #endif
526         }
527         return IRQ_HANDLED;
528 }
529
530 /*
531  * -------------------------------------------------------------------
532  * Here ends the serial interrupt routines.
533  * -------------------------------------------------------------------
534  */
535
536 /*
537  * This routine is used to handle the "bottom half" processing for the
538  * serial driver, known also the "software interrupt" processing.
539  * This processing is done at the kernel interrupt level, after the
540  * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
541  * is where time-consuming activities which can not be done in the
542  * interrupt driver proper are done; the interrupt driver schedules
543  * them using rs_sched_event(), and they get done here.
544  */
545
546 static void do_softint(unsigned long private_)
547 {
548         struct async_struct     *info = (struct async_struct *) private_;
549         struct tty_struct       *tty;
550
551         tty = info->tty;
552         if (!tty)
553                 return;
554
555         if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
556                 tty_wakeup(tty);
557                 wake_up_interruptible(&tty->write_wait);
558         }
559 }
560
561 /*
562  * ---------------------------------------------------------------
563  * Low level utility subroutines for the serial driver:  routines to
564  * figure out the appropriate timeout for an interrupt chain, routines
565  * to initialize and startup a serial port, and routines to shutdown a
566  * serial port.  Useful stuff like that.
567  * ---------------------------------------------------------------
568  */
569
570 static int startup(struct async_struct * info)
571 {
572         unsigned long flags;
573         int     retval=0;
574         unsigned long page;
575
576         page = get_zeroed_page(GFP_KERNEL);
577         if (!page)
578                 return -ENOMEM;
579
580         local_irq_save(flags);
581
582         if (info->flags & ASYNC_INITIALIZED) {
583                 free_page(page);
584                 goto errout;
585         }
586
587         if (info->xmit.buf)
588                 free_page(page);
589         else
590                 info->xmit.buf = (unsigned char *) page;
591
592 #ifdef SERIAL_DEBUG_OPEN
593         printk("starting up ttys%d ...", info->line);
594 #endif
595
596         /* Clear anything in the input buffer */
597
598         custom.intreq = IF_RBF;
599         mb();
600
601         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
602         if (retval) {
603           if (serial_isroot()) {
604             if (info->tty)
605               set_bit(TTY_IO_ERROR,
606                       &info->tty->flags);
607             retval = 0;
608           }
609           goto errout;
610         }
611
612         /* enable both Rx and Tx interrupts */
613         custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
614         mb();
615         info->IER = UART_IER_MSI;
616
617         /* remember current state of the DCD and CTS bits */
618         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
619
620         IRQ_ports = info;
621
622         info->MCR = 0;
623         if (info->tty->termios->c_cflag & CBAUD)
624           info->MCR = SER_DTR | SER_RTS;
625         rtsdtr_ctrl(info->MCR);
626
627         if (info->tty)
628                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
629         info->xmit.head = info->xmit.tail = 0;
630
631         /*
632          * Set up the tty->alt_speed kludge
633          */
634         if (info->tty) {
635                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
636                         info->tty->alt_speed = 57600;
637                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
638                         info->tty->alt_speed = 115200;
639                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
640                         info->tty->alt_speed = 230400;
641                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
642                         info->tty->alt_speed = 460800;
643         }
644
645         /*
646          * and set the speed of the serial port
647          */
648         change_speed(info, NULL);
649
650         info->flags |= ASYNC_INITIALIZED;
651         local_irq_restore(flags);
652         return 0;
653
654 errout:
655         local_irq_restore(flags);
656         return retval;
657 }
658
659 /*
660  * This routine will shutdown a serial port; interrupts are disabled, and
661  * DTR is dropped if the hangup on close termio flag is on.
662  */
663 static void shutdown(struct async_struct * info)
664 {
665         unsigned long   flags;
666         struct serial_state *state;
667
668         if (!(info->flags & ASYNC_INITIALIZED))
669                 return;
670
671         state = info->state;
672
673 #ifdef SERIAL_DEBUG_OPEN
674         printk("Shutting down serial port %d ....\n", info->line);
675 #endif
676
677         local_irq_save(flags); /* Disable interrupts */
678
679         /*
680          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
681          * here so the queue might never be waken up
682          */
683         wake_up_interruptible(&info->delta_msr_wait);
684
685         IRQ_ports = NULL;
686
687         /*
688          * Free the IRQ, if necessary
689          */
690         free_irq(IRQ_AMIGA_VERTB, info);
691
692         if (info->xmit.buf) {
693                 free_page((unsigned long) info->xmit.buf);
694                 info->xmit.buf = NULL;
695         }
696
697         info->IER = 0;
698         custom.intena = IF_RBF | IF_TBE;
699         mb();
700
701         /* disable break condition */
702         custom.adkcon = AC_UARTBRK;
703         mb();
704
705         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
706                 info->MCR &= ~(SER_DTR|SER_RTS);
707         rtsdtr_ctrl(info->MCR);
708
709         if (info->tty)
710                 set_bit(TTY_IO_ERROR, &info->tty->flags);
711
712         info->flags &= ~ASYNC_INITIALIZED;
713         local_irq_restore(flags);
714 }
715
716
717 /*
718  * This routine is called to set the UART divisor registers to match
719  * the specified baud rate for a serial port.
720  */
721 static void change_speed(struct async_struct *info,
722                          struct termios *old_termios)
723 {
724         int     quot = 0, baud_base, baud;
725         unsigned cflag, cval = 0;
726         int     bits;
727         unsigned long   flags;
728
729         if (!info->tty || !info->tty->termios)
730                 return;
731         cflag = info->tty->termios->c_cflag;
732
733         /* Byte size is always 8 bits plus parity bit if requested */
734
735         cval = 3; bits = 10;
736         if (cflag & CSTOPB) {
737                 cval |= 0x04;
738                 bits++;
739         }
740         if (cflag & PARENB) {
741                 cval |= UART_LCR_PARITY;
742                 bits++;
743         }
744         if (!(cflag & PARODD))
745                 cval |= UART_LCR_EPAR;
746 #ifdef CMSPAR
747         if (cflag & CMSPAR)
748                 cval |= UART_LCR_SPAR;
749 #endif
750
751         /* Determine divisor based on baud rate */
752         baud = tty_get_baud_rate(info->tty);
753         if (!baud)
754                 baud = 9600;    /* B0 transition handled in rs_set_termios */
755         baud_base = info->state->baud_base;
756         if (baud == 38400 &&
757             ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
758                 quot = info->state->custom_divisor;
759         else {
760                 if (baud == 134)
761                         /* Special case since 134 is really 134.5 */
762                         quot = (2*baud_base / 269);
763                 else if (baud)
764                         quot = baud_base / baud;
765         }
766         /* If the quotient is zero refuse the change */
767         if (!quot && old_termios) {
768                 info->tty->termios->c_cflag &= ~CBAUD;
769                 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
770                 baud = tty_get_baud_rate(info->tty);
771                 if (!baud)
772                         baud = 9600;
773                 if (baud == 38400 &&
774                     ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
775                         quot = info->state->custom_divisor;
776                 else {
777                         if (baud == 134)
778                                 /* Special case since 134 is really 134.5 */
779                                 quot = (2*baud_base / 269);
780                         else if (baud)
781                                 quot = baud_base / baud;
782                 }
783         }
784         /* As a last resort, if the quotient is zero, default to 9600 bps */
785         if (!quot)
786                 quot = baud_base / 9600;
787         info->quot = quot;
788         info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
789         info->timeout += HZ/50;         /* Add .02 seconds of slop */
790
791         /* CTS flow control flag and modem status interrupts */
792         info->IER &= ~UART_IER_MSI;
793         if (info->flags & ASYNC_HARDPPS_CD)
794                 info->IER |= UART_IER_MSI;
795         if (cflag & CRTSCTS) {
796                 info->flags |= ASYNC_CTS_FLOW;
797                 info->IER |= UART_IER_MSI;
798         } else
799                 info->flags &= ~ASYNC_CTS_FLOW;
800         if (cflag & CLOCAL)
801                 info->flags &= ~ASYNC_CHECK_CD;
802         else {
803                 info->flags |= ASYNC_CHECK_CD;
804                 info->IER |= UART_IER_MSI;
805         }
806         /* TBD:
807          * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
808          */
809
810         /*
811          * Set up parity check flag
812          */
813 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
814
815         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
816         if (I_INPCK(info->tty))
817                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
818         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
819                 info->read_status_mask |= UART_LSR_BI;
820
821         /*
822          * Characters to ignore
823          */
824         info->ignore_status_mask = 0;
825         if (I_IGNPAR(info->tty))
826                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
827         if (I_IGNBRK(info->tty)) {
828                 info->ignore_status_mask |= UART_LSR_BI;
829                 /*
830                  * If we're ignore parity and break indicators, ignore 
831                  * overruns too.  (For real raw support).
832                  */
833                 if (I_IGNPAR(info->tty))
834                         info->ignore_status_mask |= UART_LSR_OE;
835         }
836         /*
837          * !!! ignore all characters if CREAD is not set
838          */
839         if ((cflag & CREAD) == 0)
840                 info->ignore_status_mask |= UART_LSR_DR;
841         local_irq_save(flags);
842
843         {
844           short serper;
845
846         /* Set up the baud rate */
847           serper = quot - 1;
848
849         /* Enable or disable parity bit */
850
851         if(cval & UART_LCR_PARITY)
852           serper |= (SERPER_PARENB);
853
854         custom.serper = serper;
855         mb();
856         }
857
858         info->LCR = cval;                               /* Save LCR */
859         local_irq_restore(flags);
860 }
861
862 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
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_put_char"))
868                 return;
869
870         if (!tty || !info->xmit.buf)
871                 return;
872
873         local_irq_save(flags);
874         if (CIRC_SPACE(info->xmit.head,
875                        info->xmit.tail,
876                        SERIAL_XMIT_SIZE) == 0) {
877                 local_irq_restore(flags);
878                 return;
879         }
880
881         info->xmit.buf[info->xmit.head++] = ch;
882         info->xmit.head &= SERIAL_XMIT_SIZE-1;
883         local_irq_restore(flags);
884 }
885
886 static void rs_flush_chars(struct tty_struct *tty)
887 {
888         struct async_struct *info = (struct async_struct *)tty->driver_data;
889         unsigned long flags;
890
891         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
892                 return;
893
894         if (info->xmit.head == info->xmit.tail
895             || tty->stopped
896             || tty->hw_stopped
897             || !info->xmit.buf)
898                 return;
899
900         local_irq_save(flags);
901         info->IER |= UART_IER_THRI;
902         custom.intena = IF_SETCLR | IF_TBE;
903         mb();
904         /* set a pending Tx Interrupt, transmitter should restart now */
905         custom.intreq = IF_SETCLR | IF_TBE;
906         mb();
907         local_irq_restore(flags);
908 }
909
910 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
911 {
912         int     c, ret = 0;
913         struct async_struct *info = (struct async_struct *)tty->driver_data;
914         unsigned long flags;
915
916         if (serial_paranoia_check(info, tty->name, "rs_write"))
917                 return 0;
918
919         if (!tty || !info->xmit.buf || !tmp_buf)
920                 return 0;
921
922         local_save_flags(flags);
923         local_irq_disable();
924         while (1) {
925                 c = CIRC_SPACE_TO_END(info->xmit.head,
926                                       info->xmit.tail,
927                                       SERIAL_XMIT_SIZE);
928                 if (count < c)
929                         c = count;
930                 if (c <= 0) {
931                         break;
932                 }
933                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
934                 info->xmit.head = ((info->xmit.head + c) &
935                                    (SERIAL_XMIT_SIZE-1));
936                 buf += c;
937                 count -= c;
938                 ret += c;
939         }
940         local_irq_restore(flags);
941
942         if (info->xmit.head != info->xmit.tail
943             && !tty->stopped
944             && !tty->hw_stopped
945             && !(info->IER & UART_IER_THRI)) {
946                 info->IER |= UART_IER_THRI;
947                 local_irq_disable();
948                 custom.intena = IF_SETCLR | IF_TBE;
949                 mb();
950                 /* set a pending Tx Interrupt, transmitter should restart now */
951                 custom.intreq = IF_SETCLR | IF_TBE;
952                 mb();
953                 local_irq_restore(flags);
954         }
955         return ret;
956 }
957
958 static int rs_write_room(struct tty_struct *tty)
959 {
960         struct async_struct *info = (struct async_struct *)tty->driver_data;
961
962         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
963                 return 0;
964         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
965 }
966
967 static int rs_chars_in_buffer(struct tty_struct *tty)
968 {
969         struct async_struct *info = (struct async_struct *)tty->driver_data;
970
971         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
972                 return 0;
973         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
974 }
975
976 static void rs_flush_buffer(struct tty_struct *tty)
977 {
978         struct async_struct *info = (struct async_struct *)tty->driver_data;
979         unsigned long flags;
980
981         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
982                 return;
983         local_irq_save(flags);
984         info->xmit.head = info->xmit.tail = 0;
985         local_irq_restore(flags);
986         wake_up_interruptible(&tty->write_wait);
987         tty_wakeup(tty);
988 }
989
990 /*
991  * This function is used to send a high-priority XON/XOFF character to
992  * the device
993  */
994 static void rs_send_xchar(struct tty_struct *tty, char ch)
995 {
996         struct async_struct *info = (struct async_struct *)tty->driver_data;
997         unsigned long flags;
998
999         if (serial_paranoia_check(info, tty->name, "rs_send_char"))
1000                 return;
1001
1002         info->x_char = ch;
1003         if (ch) {
1004                 /* Make sure transmit interrupts are on */
1005
1006                 /* Check this ! */
1007                 local_irq_save(flags);
1008                 if(!(custom.intenar & IF_TBE)) {
1009                     custom.intena = IF_SETCLR | IF_TBE;
1010                     mb();
1011                     /* set a pending Tx Interrupt, transmitter should restart now */
1012                     custom.intreq = IF_SETCLR | IF_TBE;
1013                     mb();
1014                 }
1015                 local_irq_restore(flags);
1016
1017                 info->IER |= UART_IER_THRI;
1018         }
1019 }
1020
1021 /*
1022  * ------------------------------------------------------------
1023  * rs_throttle()
1024  * 
1025  * This routine is called by the upper-layer tty layer to signal that
1026  * incoming characters should be throttled.
1027  * ------------------------------------------------------------
1028  */
1029 static void rs_throttle(struct tty_struct * tty)
1030 {
1031         struct async_struct *info = (struct async_struct *)tty->driver_data;
1032         unsigned long flags;
1033 #ifdef SERIAL_DEBUG_THROTTLE
1034         char    buf[64];
1035
1036         printk("throttle %s: %d....\n", tty_name(tty, buf),
1037                tty->ldisc.chars_in_buffer(tty));
1038 #endif
1039
1040         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1041                 return;
1042
1043         if (I_IXOFF(tty))
1044                 rs_send_xchar(tty, STOP_CHAR(tty));
1045
1046         if (tty->termios->c_cflag & CRTSCTS)
1047                 info->MCR &= ~SER_RTS;
1048
1049         local_irq_save(flags);
1050         rtsdtr_ctrl(info->MCR);
1051         local_irq_restore(flags);
1052 }
1053
1054 static void rs_unthrottle(struct tty_struct * tty)
1055 {
1056         struct async_struct *info = (struct async_struct *)tty->driver_data;
1057         unsigned long flags;
1058 #ifdef SERIAL_DEBUG_THROTTLE
1059         char    buf[64];
1060
1061         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1062                tty->ldisc.chars_in_buffer(tty));
1063 #endif
1064
1065         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1066                 return;
1067
1068         if (I_IXOFF(tty)) {
1069                 if (info->x_char)
1070                         info->x_char = 0;
1071                 else
1072                         rs_send_xchar(tty, START_CHAR(tty));
1073         }
1074         if (tty->termios->c_cflag & CRTSCTS)
1075                 info->MCR |= SER_RTS;
1076         local_irq_save(flags);
1077         rtsdtr_ctrl(info->MCR);
1078         local_irq_restore(flags);
1079 }
1080
1081 /*
1082  * ------------------------------------------------------------
1083  * rs_ioctl() and friends
1084  * ------------------------------------------------------------
1085  */
1086
1087 static int get_serial_info(struct async_struct * info,
1088                            struct serial_struct * retinfo)
1089 {
1090         struct serial_struct tmp;
1091         struct serial_state *state = info->state;
1092    
1093         if (!retinfo)
1094                 return -EFAULT;
1095         memset(&tmp, 0, sizeof(tmp));
1096         tmp.type = state->type;
1097         tmp.line = state->line;
1098         tmp.port = state->port;
1099         tmp.irq = state->irq;
1100         tmp.flags = state->flags;
1101         tmp.xmit_fifo_size = state->xmit_fifo_size;
1102         tmp.baud_base = state->baud_base;
1103         tmp.close_delay = state->close_delay;
1104         tmp.closing_wait = state->closing_wait;
1105         tmp.custom_divisor = state->custom_divisor;
1106         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1107                 return -EFAULT;
1108         return 0;
1109 }
1110
1111 static int set_serial_info(struct async_struct * info,
1112                            struct serial_struct * new_info)
1113 {
1114         struct serial_struct new_serial;
1115         struct serial_state old_state, *state;
1116         unsigned int            change_irq,change_port;
1117         int                     retval = 0;
1118
1119         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1120                 return -EFAULT;
1121         state = info->state;
1122         old_state = *state;
1123   
1124         change_irq = new_serial.irq != state->irq;
1125         change_port = (new_serial.port != state->port);
1126         if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size))
1127           return -EINVAL;
1128   
1129         if (!serial_isroot()) {
1130                 if ((new_serial.baud_base != state->baud_base) ||
1131                     (new_serial.close_delay != state->close_delay) ||
1132                     (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1133                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1134                      (state->flags & ~ASYNC_USR_MASK)))
1135                         return -EPERM;
1136                 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1137                                (new_serial.flags & ASYNC_USR_MASK));
1138                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1139                                (new_serial.flags & ASYNC_USR_MASK));
1140                 state->custom_divisor = new_serial.custom_divisor;
1141                 goto check_and_exit;
1142         }
1143
1144         if (new_serial.baud_base < 9600)
1145                 return -EINVAL;
1146
1147         /*
1148          * OK, past this point, all the error checking has been done.
1149          * At this point, we start making changes.....
1150          */
1151
1152         state->baud_base = new_serial.baud_base;
1153         state->flags = ((state->flags & ~ASYNC_FLAGS) |
1154                         (new_serial.flags & ASYNC_FLAGS));
1155         info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1156                        (info->flags & ASYNC_INTERNAL_FLAGS));
1157         state->custom_divisor = new_serial.custom_divisor;
1158         state->close_delay = new_serial.close_delay * HZ/100;
1159         state->closing_wait = new_serial.closing_wait * HZ/100;
1160         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1161
1162 check_and_exit:
1163         if (info->flags & ASYNC_INITIALIZED) {
1164                 if (((old_state.flags & ASYNC_SPD_MASK) !=
1165                      (state->flags & ASYNC_SPD_MASK)) ||
1166                     (old_state.custom_divisor != state->custom_divisor)) {
1167                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1168                                 info->tty->alt_speed = 57600;
1169                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1170                                 info->tty->alt_speed = 115200;
1171                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1172                                 info->tty->alt_speed = 230400;
1173                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1174                                 info->tty->alt_speed = 460800;
1175                         change_speed(info, NULL);
1176                 }
1177         } else
1178                 retval = startup(info);
1179         return retval;
1180 }
1181
1182
1183 /*
1184  * get_lsr_info - get line status register info
1185  *
1186  * Purpose: Let user call ioctl() to get info when the UART physically
1187  *          is emptied.  On bus types like RS485, the transmitter must
1188  *          release the bus after transmitting. This must be done when
1189  *          the transmit shift register is empty, not be done when the
1190  *          transmit holding register is empty.  This functionality
1191  *          allows an RS485 driver to be written in user space. 
1192  */
1193 static int get_lsr_info(struct async_struct * info, unsigned int *value)
1194 {
1195         unsigned char status;
1196         unsigned int result;
1197         unsigned long flags;
1198
1199         local_irq_save(flags);
1200         status = custom.serdatr;
1201         mb();
1202         local_irq_restore(flags);
1203         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1204         if (copy_to_user(value, &result, sizeof(int)))
1205                 return -EFAULT;
1206         return 0;
1207 }
1208
1209
1210 static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1211 {
1212         struct async_struct * info = (struct async_struct *)tty->driver_data;
1213         unsigned char control, status;
1214         unsigned long flags;
1215
1216         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1217                 return -ENODEV;
1218         if (tty->flags & (1 << TTY_IO_ERROR))
1219                 return -EIO;
1220
1221         control = info->MCR;
1222         local_irq_save(flags);
1223         status = ciab.pra;
1224         local_irq_restore(flags);
1225         return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1226                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1227                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1228                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1229                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1230 }
1231
1232 static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1233                        unsigned int set, unsigned int clear)
1234 {
1235         struct async_struct * info = (struct async_struct *)tty->driver_data;
1236         unsigned long flags;
1237
1238         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1239                 return -ENODEV;
1240         if (tty->flags & (1 << TTY_IO_ERROR))
1241                 return -EIO;
1242
1243         local_irq_save(flags);
1244         if (set & TIOCM_RTS)
1245                 info->MCR |= SER_RTS;
1246         if (set & TIOCM_DTR)
1247                 info->MCR |= SER_DTR;
1248         if (clear & TIOCM_RTS)
1249                 info->MCR &= ~SER_RTS;
1250         if (clear & TIOCM_DTR)
1251                 info->MCR &= ~SER_DTR;
1252         rtsdtr_ctrl(info->MCR);
1253         local_irq_restore(flags);
1254         return 0;
1255 }
1256
1257 /*
1258  * rs_break() --- routine which turns the break handling on or off
1259  */
1260 static void rs_break(struct tty_struct *tty, int break_state)
1261 {
1262         struct async_struct * info = (struct async_struct *)tty->driver_data;
1263         unsigned long flags;
1264
1265         if (serial_paranoia_check(info, tty->name, "rs_break"))
1266                 return;
1267
1268         local_irq_save(flags);
1269         if (break_state == -1)
1270           custom.adkcon = AC_SETCLR | AC_UARTBRK;
1271         else
1272           custom.adkcon = AC_UARTBRK;
1273         mb();
1274         local_irq_restore(flags);
1275 }
1276
1277
1278 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1279                     unsigned int cmd, unsigned long arg)
1280 {
1281         struct async_struct * info = (struct async_struct *)tty->driver_data;
1282         struct async_icount cprev, cnow;        /* kernel counter temps */
1283         struct serial_icounter_struct icount;
1284         unsigned long flags;
1285
1286         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1287                 return -ENODEV;
1288
1289         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1290             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1291             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1292                 if (tty->flags & (1 << TTY_IO_ERROR))
1293                     return -EIO;
1294         }
1295
1296         switch (cmd) {
1297                 case TIOCGSERIAL:
1298                         return get_serial_info(info,
1299                                                (struct serial_struct *) arg);
1300                 case TIOCSSERIAL:
1301                         return set_serial_info(info,
1302                                                (struct serial_struct *) arg);
1303                 case TIOCSERCONFIG:
1304                         return 0;
1305
1306                 case TIOCSERGETLSR: /* Get line status register */
1307                         return get_lsr_info(info, (unsigned int *) arg);
1308
1309                 case TIOCSERGSTRUCT:
1310                         if (copy_to_user((struct async_struct *) arg,
1311                                          info, sizeof(struct async_struct)))
1312                                 return -EFAULT;
1313                         return 0;
1314
1315                 /*
1316                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1317                  * - mask passed in arg for lines of interest
1318                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1319                  * Caller should use TIOCGICOUNT to see which one it was
1320                  */
1321                 case TIOCMIWAIT:
1322                         local_irq_save(flags);
1323                         /* note the counters on entry */
1324                         cprev = info->state->icount;
1325                         local_irq_restore(flags);
1326                         while (1) {
1327                                 interruptible_sleep_on(&info->delta_msr_wait);
1328                                 /* see if a signal did it */
1329                                 if (signal_pending(current))
1330                                         return -ERESTARTSYS;
1331                                 local_irq_save(flags);
1332                                 cnow = info->state->icount; /* atomic copy */
1333                                 local_irq_restore(flags);
1334                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 
1335                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1336                                         return -EIO; /* no change => error */
1337                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1338                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1339                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1340                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1341                                         return 0;
1342                                 }
1343                                 cprev = cnow;
1344                         }
1345                         /* NOTREACHED */
1346
1347                 /* 
1348                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1349                  * Return: write counters to the user passed counter struct
1350                  * NB: both 1->0 and 0->1 transitions are counted except for
1351                  *     RI where only 0->1 is counted.
1352                  */
1353                 case TIOCGICOUNT:
1354                         local_irq_save(flags);
1355                         cnow = info->state->icount;
1356                         local_irq_restore(flags);
1357                         icount.cts = cnow.cts;
1358                         icount.dsr = cnow.dsr;
1359                         icount.rng = cnow.rng;
1360                         icount.dcd = cnow.dcd;
1361                         icount.rx = cnow.rx;
1362                         icount.tx = cnow.tx;
1363                         icount.frame = cnow.frame;
1364                         icount.overrun = cnow.overrun;
1365                         icount.parity = cnow.parity;
1366                         icount.brk = cnow.brk;
1367                         icount.buf_overrun = cnow.buf_overrun;
1368
1369                         if (copy_to_user((void *)arg, &icount, sizeof(icount)))
1370                                 return -EFAULT;
1371                         return 0;
1372                 case TIOCSERGWILD:
1373                 case TIOCSERSWILD:
1374                         /* "setserial -W" is called in Debian boot */
1375                         printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1376                         return 0;
1377
1378                 default:
1379                         return -ENOIOCTLCMD;
1380                 }
1381         return 0;
1382 }
1383
1384 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1385 {
1386         struct async_struct *info = (struct async_struct *)tty->driver_data;
1387         unsigned long flags;
1388         unsigned int cflag = tty->termios->c_cflag;
1389
1390         if (   (cflag == old_termios->c_cflag)
1391             && (   RELEVANT_IFLAG(tty->termios->c_iflag) 
1392                 == RELEVANT_IFLAG(old_termios->c_iflag)))
1393           return;
1394
1395         change_speed(info, old_termios);
1396
1397         /* Handle transition to B0 status */
1398         if ((old_termios->c_cflag & CBAUD) &&
1399             !(cflag & CBAUD)) {
1400                 info->MCR &= ~(SER_DTR|SER_RTS);
1401                 local_irq_save(flags);
1402                 rtsdtr_ctrl(info->MCR);
1403                 local_irq_restore(flags);
1404         }
1405
1406         /* Handle transition away from B0 status */
1407         if (!(old_termios->c_cflag & CBAUD) &&
1408             (cflag & CBAUD)) {
1409                 info->MCR |= SER_DTR;
1410                 if (!(tty->termios->c_cflag & CRTSCTS) || 
1411                     !test_bit(TTY_THROTTLED, &tty->flags)) {
1412                         info->MCR |= SER_RTS;
1413                 }
1414                 local_irq_save(flags);
1415                 rtsdtr_ctrl(info->MCR);
1416                 local_irq_restore(flags);
1417         }
1418
1419         /* Handle turning off CRTSCTS */
1420         if ((old_termios->c_cflag & CRTSCTS) &&
1421             !(tty->termios->c_cflag & CRTSCTS)) {
1422                 tty->hw_stopped = 0;
1423                 rs_start(tty);
1424         }
1425
1426 #if 0
1427         /*
1428          * No need to wake up processes in open wait, since they
1429          * sample the CLOCAL flag once, and don't recheck it.
1430          * XXX  It's not clear whether the current behavior is correct
1431          * or not.  Hence, this may change.....
1432          */
1433         if (!(old_termios->c_cflag & CLOCAL) &&
1434             (tty->termios->c_cflag & CLOCAL))
1435                 wake_up_interruptible(&info->open_wait);
1436 #endif
1437 }
1438
1439 /*
1440  * ------------------------------------------------------------
1441  * rs_close()
1442  * 
1443  * This routine is called when the serial port gets closed.  First, we
1444  * wait for the last remaining data to be sent.  Then, we unlink its
1445  * async structure from the interrupt chain if necessary, and we free
1446  * that IRQ if nothing is left in the chain.
1447  * ------------------------------------------------------------
1448  */
1449 static void rs_close(struct tty_struct *tty, struct file * filp)
1450 {
1451         struct async_struct * info = (struct async_struct *)tty->driver_data;
1452         struct serial_state *state;
1453         unsigned long flags;
1454
1455         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1456                 return;
1457
1458         state = info->state;
1459
1460         local_irq_save(flags);
1461
1462         if (tty_hung_up_p(filp)) {
1463                 DBG_CNT("before DEC-hung");
1464                 local_irq_restore(flags);
1465                 return;
1466         }
1467
1468 #ifdef SERIAL_DEBUG_OPEN
1469         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1470 #endif
1471         if ((tty->count == 1) && (state->count != 1)) {
1472                 /*
1473                  * Uh, oh.  tty->count is 1, which means that the tty
1474                  * structure will be freed.  state->count should always
1475                  * be one in these conditions.  If it's greater than
1476                  * one, we've got real problems, since it means the
1477                  * serial port won't be shutdown.
1478                  */
1479                 printk("rs_close: bad serial port count; tty->count is 1, "
1480                        "state->count is %d\n", state->count);
1481                 state->count = 1;
1482         }
1483         if (--state->count < 0) {
1484                 printk("rs_close: bad serial port count for ttys%d: %d\n",
1485                        info->line, state->count);
1486                 state->count = 0;
1487         }
1488         if (state->count) {
1489                 DBG_CNT("before DEC-2");
1490                 local_irq_restore(flags);
1491                 return;
1492         }
1493         info->flags |= ASYNC_CLOSING;
1494         /*
1495          * Now we wait for the transmit buffer to clear; and we notify 
1496          * the line discipline to only process XON/XOFF characters.
1497          */
1498         tty->closing = 1;
1499         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1500                 tty_wait_until_sent(tty, info->closing_wait);
1501         /*
1502          * At this point we stop accepting input.  To do this, we
1503          * disable the receive line status interrupts, and tell the
1504          * interrupt driver to stop checking the data ready bit in the
1505          * line status register.
1506          */
1507         info->read_status_mask &= ~UART_LSR_DR;
1508         if (info->flags & ASYNC_INITIALIZED) {
1509                 /* disable receive interrupts */
1510                 custom.intena = IF_RBF;
1511                 mb();
1512                 /* clear any pending receive interrupt */
1513                 custom.intreq = IF_RBF;
1514                 mb();
1515
1516                 /*
1517                  * Before we drop DTR, make sure the UART transmitter
1518                  * has completely drained; this is especially
1519                  * important if there is a transmit FIFO!
1520                  */
1521                 rs_wait_until_sent(tty, info->timeout);
1522         }
1523         shutdown(info);
1524         if (tty->driver->flush_buffer)
1525                 tty->driver->flush_buffer(tty);
1526                 
1527         tty_ldisc_flush(tty);
1528         tty->closing = 0;
1529         info->event = 0;
1530         info->tty = NULL;
1531         if (info->blocked_open) {
1532                 if (info->close_delay) {
1533                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1534                 }
1535                 wake_up_interruptible(&info->open_wait);
1536         }
1537         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1538         wake_up_interruptible(&info->close_wait);
1539         local_irq_restore(flags);
1540 }
1541
1542 /*
1543  * rs_wait_until_sent() --- wait until the transmitter is empty
1544  */
1545 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1546 {
1547         struct async_struct * info = (struct async_struct *)tty->driver_data;
1548         unsigned long orig_jiffies, char_time;
1549         int lsr;
1550
1551         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1552                 return;
1553
1554         if (info->xmit_fifo_size == 0)
1555                 return; /* Just in case.... */
1556
1557         orig_jiffies = jiffies;
1558         /*
1559          * Set the check interval to be 1/5 of the estimated time to
1560          * send a single character, and make it at least 1.  The check
1561          * interval should also be less than the timeout.
1562          * 
1563          * Note: we have to use pretty tight timings here to satisfy
1564          * the NIST-PCTS.
1565          */
1566         char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1567         char_time = char_time / 5;
1568         if (char_time == 0)
1569                 char_time = 1;
1570         if (timeout)
1571           char_time = min_t(unsigned long, char_time, timeout);
1572         /*
1573          * If the transmitter hasn't cleared in twice the approximate
1574          * amount of time to send the entire FIFO, it probably won't
1575          * ever clear.  This assumes the UART isn't doing flow
1576          * control, which is currently the case.  Hence, if it ever
1577          * takes longer than info->timeout, this is probably due to a
1578          * UART bug of some kind.  So, we clamp the timeout parameter at
1579          * 2*info->timeout.
1580          */
1581         if (!timeout || timeout > 2*info->timeout)
1582                 timeout = 2*info->timeout;
1583 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1584         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1585         printk("jiff=%lu...", jiffies);
1586 #endif
1587         while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1588 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1589                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1590 #endif
1591                 msleep_interruptible(jiffies_to_msecs(char_time));
1592                 if (signal_pending(current))
1593                         break;
1594                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1595                         break;
1596         }
1597         current->state = TASK_RUNNING;
1598 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1599         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1600 #endif
1601 }
1602
1603 /*
1604  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1605  */
1606 static void rs_hangup(struct tty_struct *tty)
1607 {
1608         struct async_struct * info = (struct async_struct *)tty->driver_data;
1609         struct serial_state *state = info->state;
1610
1611         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1612                 return;
1613
1614         state = info->state;
1615
1616         rs_flush_buffer(tty);
1617         shutdown(info);
1618         info->event = 0;
1619         state->count = 0;
1620         info->flags &= ~ASYNC_NORMAL_ACTIVE;
1621         info->tty = NULL;
1622         wake_up_interruptible(&info->open_wait);
1623 }
1624
1625 /*
1626  * ------------------------------------------------------------
1627  * rs_open() and friends
1628  * ------------------------------------------------------------
1629  */
1630 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1631                            struct async_struct *info)
1632 {
1633 #ifdef DECLARE_WAITQUEUE
1634         DECLARE_WAITQUEUE(wait, current);
1635 #else
1636         struct wait_queue wait = { current, NULL };
1637 #endif
1638         struct serial_state *state = info->state;
1639         int             retval;
1640         int             do_clocal = 0, extra_count = 0;
1641         unsigned long   flags;
1642
1643         /*
1644          * If the device is in the middle of being closed, then block
1645          * until it's done, and then try again.
1646          */
1647         if (tty_hung_up_p(filp) ||
1648             (info->flags & ASYNC_CLOSING)) {
1649                 if (info->flags & ASYNC_CLOSING)
1650                         interruptible_sleep_on(&info->close_wait);
1651 #ifdef SERIAL_DO_RESTART
1652                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1653                         -EAGAIN : -ERESTARTSYS);
1654 #else
1655                 return -EAGAIN;
1656 #endif
1657         }
1658
1659         /*
1660          * If non-blocking mode is set, or the port is not enabled,
1661          * then make the check up front and then exit.
1662          */
1663         if ((filp->f_flags & O_NONBLOCK) ||
1664             (tty->flags & (1 << TTY_IO_ERROR))) {
1665                 info->flags |= ASYNC_NORMAL_ACTIVE;
1666                 return 0;
1667         }
1668
1669         if (tty->termios->c_cflag & CLOCAL)
1670                 do_clocal = 1;
1671
1672         /*
1673          * Block waiting for the carrier detect and the line to become
1674          * free (i.e., not in use by the callout).  While we are in
1675          * this loop, state->count is dropped by one, so that
1676          * rs_close() knows when to free things.  We restore it upon
1677          * exit, either normal or abnormal.
1678          */
1679         retval = 0;
1680         add_wait_queue(&info->open_wait, &wait);
1681 #ifdef SERIAL_DEBUG_OPEN
1682         printk("block_til_ready before block: ttys%d, count = %d\n",
1683                state->line, state->count);
1684 #endif
1685         local_irq_save(flags);
1686         if (!tty_hung_up_p(filp)) {
1687                 extra_count = 1;
1688                 state->count--;
1689         }
1690         local_irq_restore(flags);
1691         info->blocked_open++;
1692         while (1) {
1693                 local_irq_save(flags);
1694                 if (tty->termios->c_cflag & CBAUD)
1695                         rtsdtr_ctrl(SER_DTR|SER_RTS);
1696                 local_irq_restore(flags);
1697                 set_current_state(TASK_INTERRUPTIBLE);
1698                 if (tty_hung_up_p(filp) ||
1699                     !(info->flags & ASYNC_INITIALIZED)) {
1700 #ifdef SERIAL_DO_RESTART
1701                         if (info->flags & ASYNC_HUP_NOTIFY)
1702                                 retval = -EAGAIN;
1703                         else
1704                                 retval = -ERESTARTSYS;
1705 #else
1706                         retval = -EAGAIN;
1707 #endif
1708                         break;
1709                 }
1710                 if (!(info->flags & ASYNC_CLOSING) &&
1711                     (do_clocal || (!(ciab.pra & SER_DCD)) ))
1712                         break;
1713                 if (signal_pending(current)) {
1714                         retval = -ERESTARTSYS;
1715                         break;
1716                 }
1717 #ifdef SERIAL_DEBUG_OPEN
1718                 printk("block_til_ready blocking: ttys%d, count = %d\n",
1719                        info->line, state->count);
1720 #endif
1721                 schedule();
1722         }
1723         current->state = TASK_RUNNING;
1724         remove_wait_queue(&info->open_wait, &wait);
1725         if (extra_count)
1726                 state->count++;
1727         info->blocked_open--;
1728 #ifdef SERIAL_DEBUG_OPEN
1729         printk("block_til_ready after blocking: ttys%d, count = %d\n",
1730                info->line, state->count);
1731 #endif
1732         if (retval)
1733                 return retval;
1734         info->flags |= ASYNC_NORMAL_ACTIVE;
1735         return 0;
1736 }
1737
1738 static int get_async_struct(int line, struct async_struct **ret_info)
1739 {
1740         struct async_struct *info;
1741         struct serial_state *sstate;
1742
1743         sstate = rs_table + line;
1744         sstate->count++;
1745         if (sstate->info) {
1746                 *ret_info = sstate->info;
1747                 return 0;
1748         }
1749         info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
1750         if (!info) {
1751                 sstate->count--;
1752                 return -ENOMEM;
1753         }
1754         memset(info, 0, sizeof(struct async_struct));
1755 #ifdef DECLARE_WAITQUEUE
1756         init_waitqueue_head(&info->open_wait);
1757         init_waitqueue_head(&info->close_wait);
1758         init_waitqueue_head(&info->delta_msr_wait);
1759 #endif
1760         info->magic = SERIAL_MAGIC;
1761         info->port = sstate->port;
1762         info->flags = sstate->flags;
1763         info->xmit_fifo_size = sstate->xmit_fifo_size;
1764         info->line = line;
1765         tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1766         info->state = sstate;
1767         if (sstate->info) {
1768                 kfree(info);
1769                 *ret_info = sstate->info;
1770                 return 0;
1771         }
1772         *ret_info = sstate->info = info;
1773         return 0;
1774 }
1775
1776 /*
1777  * This routine is called whenever a serial port is opened.  It
1778  * enables interrupts for a serial port, linking in its async structure into
1779  * the IRQ chain.   It also performs the serial-specific
1780  * initialization for the tty structure.
1781  */
1782 static int rs_open(struct tty_struct *tty, struct file * filp)
1783 {
1784         struct async_struct     *info;
1785         int                     retval, line;
1786         unsigned long           page;
1787
1788         line = tty->index;
1789         if ((line < 0) || (line >= NR_PORTS)) {
1790                 return -ENODEV;
1791         }
1792         retval = get_async_struct(line, &info);
1793         if (retval) {
1794                 return retval;
1795         }
1796         tty->driver_data = info;
1797         info->tty = tty;
1798         if (serial_paranoia_check(info, tty->name, "rs_open"))
1799                 return -ENODEV;
1800
1801 #ifdef SERIAL_DEBUG_OPEN
1802         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1803 #endif
1804         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1805
1806         if (!tmp_buf) {
1807                 page = get_zeroed_page(GFP_KERNEL);
1808                 if (!page) {
1809                         return -ENOMEM;
1810                 }
1811                 if (tmp_buf)
1812                         free_page(page);
1813                 else
1814                         tmp_buf = (unsigned char *) page;
1815         }
1816
1817         /*
1818          * If the port is the middle of closing, bail out now
1819          */
1820         if (tty_hung_up_p(filp) ||
1821             (info->flags & ASYNC_CLOSING)) {
1822                 if (info->flags & ASYNC_CLOSING)
1823                         interruptible_sleep_on(&info->close_wait);
1824 #ifdef SERIAL_DO_RESTART
1825                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1826                         -EAGAIN : -ERESTARTSYS);
1827 #else
1828                 return -EAGAIN;
1829 #endif
1830         }
1831
1832         /*
1833          * Start up serial port
1834          */
1835         retval = startup(info);
1836         if (retval) {
1837                 return retval;
1838         }
1839
1840         retval = block_til_ready(tty, filp, info);
1841         if (retval) {
1842 #ifdef SERIAL_DEBUG_OPEN
1843                 printk("rs_open returning after block_til_ready with %d\n",
1844                        retval);
1845 #endif
1846                 return retval;
1847         }
1848
1849 #ifdef SERIAL_DEBUG_OPEN
1850         printk("rs_open %s successful...", tty->name);
1851 #endif
1852         return 0;
1853 }
1854
1855 /*
1856  * /proc fs routines....
1857  */
1858
1859 static inline int line_info(char *buf, struct serial_state *state)
1860 {
1861         struct async_struct *info = state->info, scr_info;
1862         char    stat_buf[30], control, status;
1863         int     ret;
1864         unsigned long flags;
1865
1866         ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1867
1868         /*
1869          * Figure out the current RS-232 lines
1870          */
1871         if (!info) {
1872                 info = &scr_info;       /* This is just for serial_{in,out} */
1873
1874                 info->magic = SERIAL_MAGIC;
1875                 info->flags = state->flags;
1876                 info->quot = 0;
1877                 info->tty = NULL;
1878         }
1879         local_irq_save(flags);
1880         status = ciab.pra;
1881         control = info ? info->MCR : status;
1882         local_irq_restore(flags);
1883
1884         stat_buf[0] = 0;
1885         stat_buf[1] = 0;
1886         if(!(control & SER_RTS))
1887                 strcat(stat_buf, "|RTS");
1888         if(!(status & SER_CTS))
1889                 strcat(stat_buf, "|CTS");
1890         if(!(control & SER_DTR))
1891                 strcat(stat_buf, "|DTR");
1892         if(!(status & SER_DSR))
1893                 strcat(stat_buf, "|DSR");
1894         if(!(status & SER_DCD))
1895                 strcat(stat_buf, "|CD");
1896
1897         if (info->quot) {
1898                 ret += sprintf(buf+ret, " baud:%d",
1899                                state->baud_base / info->quot);
1900         }
1901
1902         ret += sprintf(buf+ret, " tx:%d rx:%d",
1903                       state->icount.tx, state->icount.rx);
1904
1905         if (state->icount.frame)
1906                 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1907
1908         if (state->icount.parity)
1909                 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1910
1911         if (state->icount.brk)
1912                 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1913
1914         if (state->icount.overrun)
1915                 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1916
1917         /*
1918          * Last thing is the RS-232 status lines
1919          */
1920         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1921         return ret;
1922 }
1923
1924 static int rs_read_proc(char *page, char **start, off_t off, int count,
1925                         int *eof, void *data)
1926 {
1927         int len = 0, l;
1928         off_t   begin = 0;
1929
1930         len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1931         l = line_info(page + len, &rs_table[0]);
1932         len += l;
1933         if (len+begin > off+count)
1934           goto done;
1935         if (len+begin < off) {
1936           begin += len;
1937           len = 0;
1938         }
1939         *eof = 1;
1940 done:
1941         if (off >= len+begin)
1942                 return 0;
1943         *start = page + (off-begin);
1944         return ((count < begin+len-off) ? count : begin+len-off);
1945 }
1946
1947 /*
1948  * ---------------------------------------------------------------------
1949  * rs_init() and friends
1950  *
1951  * rs_init() is called at boot-time to initialize the serial driver.
1952  * ---------------------------------------------------------------------
1953  */
1954
1955 /*
1956  * This routine prints out the appropriate serial driver version
1957  * number, and identifies which options were configured into this
1958  * driver.
1959  */
1960 static _INLINE_ void show_serial_version(void)
1961 {
1962         printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1963 }
1964
1965
1966 int register_serial(struct serial_struct *req);
1967 void unregister_serial(int line);
1968
1969
1970 static struct tty_operations serial_ops = {
1971         .open = rs_open,
1972         .close = rs_close,
1973         .write = rs_write,
1974         .put_char = rs_put_char,
1975         .flush_chars = rs_flush_chars,
1976         .write_room = rs_write_room,
1977         .chars_in_buffer = rs_chars_in_buffer,
1978         .flush_buffer = rs_flush_buffer,
1979         .ioctl = rs_ioctl,
1980         .throttle = rs_throttle,
1981         .unthrottle = rs_unthrottle,
1982         .set_termios = rs_set_termios,
1983         .stop = rs_stop,
1984         .start = rs_start,
1985         .hangup = rs_hangup,
1986         .break_ctl = rs_break,
1987         .send_xchar = rs_send_xchar,
1988         .wait_until_sent = rs_wait_until_sent,
1989         .read_proc = rs_read_proc,
1990         .tiocmget = rs_tiocmget,
1991         .tiocmset = rs_tiocmset,
1992 };
1993
1994 /*
1995  * The serial driver boot-time initialization code!
1996  */
1997 static int __init rs_init(void)
1998 {
1999         unsigned long flags;
2000         struct serial_state * state;
2001
2002         if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
2003                 return -ENODEV;
2004
2005         serial_driver = alloc_tty_driver(1);
2006         if (!serial_driver)
2007                 return -ENOMEM;
2008
2009         /*
2010          *  We request SERDAT and SERPER only, because the serial registers are
2011          *  too spreaded over the custom register space
2012          */
2013         if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
2014                 return -EBUSY;
2015
2016         IRQ_ports = NULL;
2017
2018         show_serial_version();
2019
2020         /* Initialize the tty_driver structure */
2021
2022         serial_driver->owner = THIS_MODULE;
2023         serial_driver->driver_name = "amiserial";
2024         serial_driver->name = "ttyS";
2025         serial_driver->major = TTY_MAJOR;
2026         serial_driver->minor_start = 64;
2027         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
2028         serial_driver->subtype = SERIAL_TYPE_NORMAL;
2029         serial_driver->init_termios = tty_std_termios;
2030         serial_driver->init_termios.c_cflag =
2031                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2032         serial_driver->flags = TTY_DRIVER_REAL_RAW;
2033         tty_set_operations(serial_driver, &serial_ops);
2034
2035         if (tty_register_driver(serial_driver))
2036                 panic("Couldn't register serial driver\n");
2037
2038         state = rs_table;
2039         state->magic = SSTATE_MAGIC;
2040         state->port = (int)&custom.serdatr; /* Just to give it a value */
2041         state->line = 0;
2042         state->custom_divisor = 0;
2043         state->close_delay = 5*HZ/10;
2044         state->closing_wait = 30*HZ;
2045         state->icount.cts = state->icount.dsr = 
2046           state->icount.rng = state->icount.dcd = 0;
2047         state->icount.rx = state->icount.tx = 0;
2048         state->icount.frame = state->icount.parity = 0;
2049         state->icount.overrun = state->icount.brk = 0;
2050         /*
2051         if(state->port && check_region(state->port,REGION_LENGTH(state)))
2052           continue;
2053         */
2054
2055         printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2056                        state->line);
2057
2058         /* Hardware set up */
2059
2060         state->baud_base = amiga_colorclock;
2061         state->xmit_fifo_size = 1;
2062
2063         local_irq_save(flags);
2064
2065         /* set ISRs, and then disable the rx interrupts */
2066         request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2067         request_irq(IRQ_AMIGA_RBF, ser_rx_int, SA_INTERRUPT, "serial RX", state);
2068
2069         /* turn off Rx and Tx interrupts */
2070         custom.intena = IF_RBF | IF_TBE;
2071         mb();
2072
2073         /* clear any pending interrupt */
2074         custom.intreq = IF_RBF | IF_TBE;
2075         mb();
2076
2077         local_irq_restore(flags);
2078
2079         /*
2080          * set the appropriate directions for the modem control flags,
2081          * and clear RTS and DTR
2082          */
2083         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
2084         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
2085
2086         return 0;
2087 }
2088
2089 static __exit void rs_exit(void) 
2090 {
2091         int error;
2092         struct async_struct *info = rs_table[0].info;
2093
2094         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2095         tasklet_kill(&info->tlet);
2096         if ((error = tty_unregister_driver(serial_driver)))
2097                 printk("SERIAL: failed to unregister serial driver (%d)\n",
2098                        error);
2099         put_tty_driver(serial_driver);
2100
2101         if (info) {
2102           rs_table[0].info = NULL;
2103           kfree(info);
2104         }
2105
2106         if (tmp_buf) {
2107                 free_page((unsigned long) tmp_buf);
2108                 tmp_buf = NULL;
2109         }
2110
2111         release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2112 }
2113
2114 module_init(rs_init)
2115 module_exit(rs_exit)
2116
2117
2118 /*
2119  * ------------------------------------------------------------
2120  * Serial console driver
2121  * ------------------------------------------------------------
2122  */
2123 #ifdef CONFIG_SERIAL_CONSOLE
2124
2125 static void amiga_serial_putc(char c)
2126 {
2127         custom.serdat = (unsigned char)c | 0x100;
2128         while (!(custom.serdatr & 0x2000))
2129                 barrier();
2130 }
2131
2132 /*
2133  *      Print a string to the serial port trying not to disturb
2134  *      any possible real use of the port...
2135  *
2136  *      The console must be locked when we get here.
2137  */
2138 static void serial_console_write(struct console *co, const char *s,
2139                                 unsigned count)
2140 {
2141         unsigned short intena = custom.intenar;
2142
2143         custom.intena = IF_TBE;
2144
2145         while (count--) {
2146                 if (*s == '\n')
2147                         amiga_serial_putc('\r');
2148                 amiga_serial_putc(*s++);
2149         }
2150
2151         custom.intena = IF_SETCLR | (intena & IF_TBE);
2152 }
2153
2154 static struct tty_driver *serial_console_device(struct console *c, int *index)
2155 {
2156         *index = 0;
2157         return serial_driver;
2158 }
2159
2160 static struct console sercons = {
2161         .name =         "ttyS",
2162         .write =        serial_console_write,
2163         .device =       serial_console_device,
2164         .flags =        CON_PRINTBUFFER,
2165         .index =        -1,
2166 };
2167
2168 /*
2169  *      Register console.
2170  */
2171 static int __init amiserial_console_init(void)
2172 {
2173         register_console(&sercons);
2174         return 0;
2175 }
2176 console_initcall(amiserial_console_init);
2177 #endif
2178
2179 MODULE_LICENSE("GPL");