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[linux-2.6] / drivers / char / amiserial.c
1 /*
2  *  linux/drivers/char/amiserial.c
3  *
4  * Serial driver for the amiga builtin port.
5  *
6  * This code was created by taking serial.c version 4.30 from kernel
7  * release 2.3.22, replacing all hardware related stuff with the
8  * corresponding amiga hardware actions, and removing all irrelevant
9  * code. As a consequence, it uses many of the constants and names
10  * associated with the registers and bits of 16550 compatible UARTS -
11  * but only to keep track of status, etc in the state variables. It
12  * was done this was to make it easier to keep the code in line with
13  * (non hardware specific) changes to serial.c.
14  *
15  * The port is registered with the tty driver as minor device 64, and
16  * therefore other ports should should only use 65 upwards.
17  *
18  * Richard Lucock 28/12/99
19  *
20  *  Copyright (C) 1991, 1992  Linus Torvalds
21  *  Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 
22  *              1998, 1999  Theodore Ts'o
23  *
24  */
25
26 /*
27  * Serial driver configuration section.  Here are the various options:
28  *
29  * SERIAL_PARANOIA_CHECK
30  *              Check the magic number for the async_structure where
31  *              ever possible.
32  */
33
34 #include <linux/delay.h>
35
36 #undef SERIAL_PARANOIA_CHECK
37 #define SERIAL_DO_RESTART
38
39 /* Set of debugging defines */
40
41 #undef SERIAL_DEBUG_INTR
42 #undef SERIAL_DEBUG_OPEN
43 #undef SERIAL_DEBUG_FLOW
44 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
45
46 /* Sanity checks */
47
48 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
49 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
50  tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
51 #else
52 #define DBG_CNT(s)
53 #endif
54
55 /*
56  * End of serial driver configuration section.
57  */
58
59 #include <linux/module.h>
60
61 #include <linux/types.h>
62 #include <linux/serial.h>
63 #include <linux/serialP.h>
64 #include <linux/serial_reg.h>
65 static char *serial_version = "4.30";
66
67 #include <linux/errno.h>
68 #include <linux/signal.h>
69 #include <linux/sched.h>
70 #include <linux/kernel.h>
71 #include <linux/timer.h>
72 #include <linux/interrupt.h>
73 #include <linux/tty.h>
74 #include <linux/tty_flip.h>
75 #include <linux/console.h>
76 #include <linux/major.h>
77 #include <linux/string.h>
78 #include <linux/fcntl.h>
79 #include <linux/ptrace.h>
80 #include <linux/ioport.h>
81 #include <linux/mm.h>
82 #include <linux/slab.h>
83 #include <linux/init.h>
84 #include <linux/bitops.h>
85
86 #include <asm/setup.h>
87
88 #include <asm/system.h>
89
90 #include <asm/irq.h>
91
92 #include <asm/amigahw.h>
93 #include <asm/amigaints.h>
94
95 #define custom amiga_custom
96 static char *serial_name = "Amiga-builtin serial driver";
97
98 static struct tty_driver *serial_driver;
99
100 /* number of characters left in xmit buffer before we ask for more */
101 #define WAKEUP_CHARS 256
102
103 static struct async_struct *IRQ_ports;
104
105 static unsigned char current_ctl_bits;
106
107 static void change_speed(struct async_struct *info, struct ktermios *old);
108 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
109
110
111 static struct serial_state rs_table[1];
112
113 #define NR_PORTS ARRAY_SIZE(rs_table)
114
115 #include <asm/uaccess.h>
116
117 #define serial_isroot() (capable(CAP_SYS_ADMIN))
118
119
120 static inline int serial_paranoia_check(struct async_struct *info,
121                                         char *name, const char *routine)
122 {
123 #ifdef SERIAL_PARANOIA_CHECK
124         static const char *badmagic =
125                 "Warning: bad magic number for serial struct (%s) in %s\n";
126         static const char *badinfo =
127                 "Warning: null async_struct for (%s) in %s\n";
128
129         if (!info) {
130                 printk(badinfo, name, routine);
131                 return 1;
132         }
133         if (info->magic != SERIAL_MAGIC) {
134                 printk(badmagic, name, routine);
135                 return 1;
136         }
137 #endif
138         return 0;
139 }
140
141 /* some serial hardware definitions */
142 #define SDR_OVRUN   (1<<15)
143 #define SDR_RBF     (1<<14)
144 #define SDR_TBE     (1<<13)
145 #define SDR_TSRE    (1<<12)
146
147 #define SERPER_PARENB    (1<<15)
148
149 #define AC_SETCLR   (1<<15)
150 #define AC_UARTBRK  (1<<11)
151
152 #define SER_DTR     (1<<7)
153 #define SER_RTS     (1<<6)
154 #define SER_DCD     (1<<5)
155 #define SER_CTS     (1<<4)
156 #define SER_DSR     (1<<3)
157
158 static __inline__ void rtsdtr_ctrl(int bits)
159 {
160     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
161 }
162
163 /*
164  * ------------------------------------------------------------
165  * rs_stop() and rs_start()
166  *
167  * This routines are called before setting or resetting tty->stopped.
168  * They enable or disable transmitter interrupts, as necessary.
169  * ------------------------------------------------------------
170  */
171 static void rs_stop(struct tty_struct *tty)
172 {
173         struct async_struct *info = (struct async_struct *)tty->driver_data;
174         unsigned long flags;
175
176         if (serial_paranoia_check(info, tty->name, "rs_stop"))
177                 return;
178
179         local_irq_save(flags);
180         if (info->IER & UART_IER_THRI) {
181                 info->IER &= ~UART_IER_THRI;
182                 /* disable Tx interrupt and remove any pending interrupts */
183                 custom.intena = IF_TBE;
184                 mb();
185                 custom.intreq = IF_TBE;
186                 mb();
187         }
188         local_irq_restore(flags);
189 }
190
191 static void rs_start(struct tty_struct *tty)
192 {
193         struct async_struct *info = (struct async_struct *)tty->driver_data;
194         unsigned long flags;
195
196         if (serial_paranoia_check(info, tty->name, "rs_start"))
197                 return;
198
199         local_irq_save(flags);
200         if (info->xmit.head != info->xmit.tail
201             && info->xmit.buf
202             && !(info->IER & UART_IER_THRI)) {
203                 info->IER |= UART_IER_THRI;
204                 custom.intena = IF_SETCLR | IF_TBE;
205                 mb();
206                 /* set a pending Tx Interrupt, transmitter should restart now */
207                 custom.intreq = IF_SETCLR | IF_TBE;
208                 mb();
209         }
210         local_irq_restore(flags);
211 }
212
213 /*
214  * ----------------------------------------------------------------------
215  *
216  * Here starts the interrupt handling routines.  All of the following
217  * subroutines are declared as inline and are folded into
218  * rs_interrupt().  They were separated out for readability's sake.
219  *
220  * Note: rs_interrupt() is a "fast" interrupt, which means that it
221  * runs with interrupts turned off.  People who may want to modify
222  * rs_interrupt() should try to keep the interrupt handler as fast as
223  * possible.  After you are done making modifications, it is not a bad
224  * idea to do:
225  * 
226  * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
227  *
228  * and look at the resulting assemble code in serial.s.
229  *
230  *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
231  * -----------------------------------------------------------------------
232  */
233
234 /*
235  * This routine is used by the interrupt handler to schedule
236  * processing in the software interrupt portion of the driver.
237  */
238 static void rs_sched_event(struct async_struct *info,
239                            int event)
240 {
241         info->event |= 1 << event;
242         tasklet_schedule(&info->tlet);
243 }
244
245 static void receive_chars(struct async_struct *info)
246 {
247         int status;
248         int serdatr;
249         struct tty_struct *tty = info->tty;
250         unsigned char ch, flag;
251         struct  async_icount *icount;
252         int oe = 0;
253
254         icount = &info->state->icount;
255
256         status = UART_LSR_DR; /* We obviously have a character! */
257         serdatr = custom.serdatr;
258         mb();
259         custom.intreq = IF_RBF;
260         mb();
261
262         if((serdatr & 0x1ff) == 0)
263             status |= UART_LSR_BI;
264         if(serdatr & SDR_OVRUN)
265             status |= UART_LSR_OE;
266
267         ch = serdatr & 0xff;
268         icount->rx++;
269
270 #ifdef SERIAL_DEBUG_INTR
271         printk("DR%02x:%02x...", ch, status);
272 #endif
273         flag = TTY_NORMAL;
274
275         /*
276          * We don't handle parity or frame errors - but I have left
277          * the code in, since I'm not sure that the errors can't be
278          * detected.
279          */
280
281         if (status & (UART_LSR_BI | UART_LSR_PE |
282                       UART_LSR_FE | UART_LSR_OE)) {
283           /*
284            * For statistics only
285            */
286           if (status & UART_LSR_BI) {
287             status &= ~(UART_LSR_FE | UART_LSR_PE);
288             icount->brk++;
289           } else if (status & UART_LSR_PE)
290             icount->parity++;
291           else if (status & UART_LSR_FE)
292             icount->frame++;
293           if (status & UART_LSR_OE)
294             icount->overrun++;
295
296           /*
297            * Now check to see if character should be
298            * ignored, and mask off conditions which
299            * should be ignored.
300            */
301           if (status & info->ignore_status_mask)
302             goto out;
303
304           status &= info->read_status_mask;
305
306           if (status & (UART_LSR_BI)) {
307 #ifdef SERIAL_DEBUG_INTR
308             printk("handling break....");
309 #endif
310             flag = TTY_BREAK;
311             if (info->flags & ASYNC_SAK)
312               do_SAK(tty);
313           } else if (status & UART_LSR_PE)
314             flag = TTY_PARITY;
315           else if (status & UART_LSR_FE)
316             flag = TTY_FRAME;
317           if (status & UART_LSR_OE) {
318             /*
319              * Overrun is special, since it's
320              * reported immediately, and doesn't
321              * affect the current character
322              */
323              oe = 1;
324           }
325         }
326         tty_insert_flip_char(tty, ch, flag);
327         if (oe == 1)
328                 tty_insert_flip_char(tty, 0, TTY_OVERRUN);
329         tty_flip_buffer_push(tty);
330 out:
331         return;
332 }
333
334 static void transmit_chars(struct async_struct *info)
335 {
336         custom.intreq = IF_TBE;
337         mb();
338         if (info->x_char) {
339                 custom.serdat = info->x_char | 0x100;
340                 mb();
341                 info->state->icount.tx++;
342                 info->x_char = 0;
343                 return;
344         }
345         if (info->xmit.head == info->xmit.tail
346             || info->tty->stopped
347             || info->tty->hw_stopped) {
348                 info->IER &= ~UART_IER_THRI;
349                 custom.intena = IF_TBE;
350                 mb();
351                 return;
352         }
353
354         custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
355         mb();
356         info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
357         info->state->icount.tx++;
358
359         if (CIRC_CNT(info->xmit.head,
360                      info->xmit.tail,
361                      SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
362                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
363
364 #ifdef SERIAL_DEBUG_INTR
365         printk("THRE...");
366 #endif
367         if (info->xmit.head == info->xmit.tail) {
368                 custom.intena = IF_TBE;
369                 mb();
370                 info->IER &= ~UART_IER_THRI;
371         }
372 }
373
374 static void check_modem_status(struct async_struct *info)
375 {
376         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
377         unsigned char dstatus;
378         struct  async_icount *icount;
379
380         /* Determine bits that have changed */
381         dstatus = status ^ current_ctl_bits;
382         current_ctl_bits = status;
383
384         if (dstatus) {
385                 icount = &info->state->icount;
386                 /* update input line counters */
387                 if (dstatus & SER_DSR)
388                         icount->dsr++;
389                 if (dstatus & SER_DCD) {
390                         icount->dcd++;
391 #ifdef CONFIG_HARD_PPS
392                         if ((info->flags & ASYNC_HARDPPS_CD) &&
393                             !(status & SER_DCD))
394                                 hardpps();
395 #endif
396                 }
397                 if (dstatus & SER_CTS)
398                         icount->cts++;
399                 wake_up_interruptible(&info->delta_msr_wait);
400         }
401
402         if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
403 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
404                 printk("ttyS%d CD now %s...", info->line,
405                        (!(status & SER_DCD)) ? "on" : "off");
406 #endif
407                 if (!(status & SER_DCD))
408                         wake_up_interruptible(&info->open_wait);
409                 else {
410 #ifdef SERIAL_DEBUG_OPEN
411                         printk("doing serial hangup...");
412 #endif
413                         if (info->tty)
414                                 tty_hangup(info->tty);
415                 }
416         }
417         if (info->flags & ASYNC_CTS_FLOW) {
418                 if (info->tty->hw_stopped) {
419                         if (!(status & SER_CTS)) {
420 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
421                                 printk("CTS tx start...");
422 #endif
423                                 info->tty->hw_stopped = 0;
424                                 info->IER |= UART_IER_THRI;
425                                 custom.intena = IF_SETCLR | IF_TBE;
426                                 mb();
427                                 /* set a pending Tx Interrupt, transmitter should restart now */
428                                 custom.intreq = IF_SETCLR | IF_TBE;
429                                 mb();
430                                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
431                                 return;
432                         }
433                 } else {
434                         if ((status & SER_CTS)) {
435 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
436                                 printk("CTS tx stop...");
437 #endif
438                                 info->tty->hw_stopped = 1;
439                                 info->IER &= ~UART_IER_THRI;
440                                 /* disable Tx interrupt and remove any pending interrupts */
441                                 custom.intena = IF_TBE;
442                                 mb();
443                                 custom.intreq = IF_TBE;
444                                 mb();
445                         }
446                 }
447         }
448 }
449
450 static irqreturn_t ser_vbl_int( int irq, void *data)
451 {
452         /* vbl is just a periodic interrupt we tie into to update modem status */
453         struct async_struct * info = IRQ_ports;
454         /*
455          * TBD - is it better to unregister from this interrupt or to
456          * ignore it if MSI is clear ?
457          */
458         if(info->IER & UART_IER_MSI)
459           check_modem_status(info);
460         return IRQ_HANDLED;
461 }
462
463 static irqreturn_t ser_rx_int(int irq, void *dev_id)
464 {
465         struct async_struct * info;
466
467 #ifdef SERIAL_DEBUG_INTR
468         printk("ser_rx_int...");
469 #endif
470
471         info = IRQ_ports;
472         if (!info || !info->tty)
473                 return IRQ_NONE;
474
475         receive_chars(info);
476         info->last_active = jiffies;
477 #ifdef SERIAL_DEBUG_INTR
478         printk("end.\n");
479 #endif
480         return IRQ_HANDLED;
481 }
482
483 static irqreturn_t ser_tx_int(int irq, void *dev_id)
484 {
485         struct async_struct * info;
486
487         if (custom.serdatr & SDR_TBE) {
488 #ifdef SERIAL_DEBUG_INTR
489           printk("ser_tx_int...");
490 #endif
491
492           info = IRQ_ports;
493           if (!info || !info->tty)
494                 return IRQ_NONE;
495
496           transmit_chars(info);
497           info->last_active = jiffies;
498 #ifdef SERIAL_DEBUG_INTR
499           printk("end.\n");
500 #endif
501         }
502         return IRQ_HANDLED;
503 }
504
505 /*
506  * -------------------------------------------------------------------
507  * Here ends the serial interrupt routines.
508  * -------------------------------------------------------------------
509  */
510
511 /*
512  * This routine is used to handle the "bottom half" processing for the
513  * serial driver, known also the "software interrupt" processing.
514  * This processing is done at the kernel interrupt level, after the
515  * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
516  * is where time-consuming activities which can not be done in the
517  * interrupt driver proper are done; the interrupt driver schedules
518  * them using rs_sched_event(), and they get done here.
519  */
520
521 static void do_softint(unsigned long private_)
522 {
523         struct async_struct     *info = (struct async_struct *) private_;
524         struct tty_struct       *tty;
525
526         tty = info->tty;
527         if (!tty)
528                 return;
529
530         if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event))
531                 tty_wakeup(tty);
532 }
533
534 /*
535  * ---------------------------------------------------------------
536  * Low level utility subroutines for the serial driver:  routines to
537  * figure out the appropriate timeout for an interrupt chain, routines
538  * to initialize and startup a serial port, and routines to shutdown a
539  * serial port.  Useful stuff like that.
540  * ---------------------------------------------------------------
541  */
542
543 static int startup(struct async_struct * info)
544 {
545         unsigned long flags;
546         int     retval=0;
547         unsigned long page;
548
549         page = get_zeroed_page(GFP_KERNEL);
550         if (!page)
551                 return -ENOMEM;
552
553         local_irq_save(flags);
554
555         if (info->flags & ASYNC_INITIALIZED) {
556                 free_page(page);
557                 goto errout;
558         }
559
560         if (info->xmit.buf)
561                 free_page(page);
562         else
563                 info->xmit.buf = (unsigned char *) page;
564
565 #ifdef SERIAL_DEBUG_OPEN
566         printk("starting up ttys%d ...", info->line);
567 #endif
568
569         /* Clear anything in the input buffer */
570
571         custom.intreq = IF_RBF;
572         mb();
573
574         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
575         if (retval) {
576           if (serial_isroot()) {
577             if (info->tty)
578               set_bit(TTY_IO_ERROR,
579                       &info->tty->flags);
580             retval = 0;
581           }
582           goto errout;
583         }
584
585         /* enable both Rx and Tx interrupts */
586         custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
587         mb();
588         info->IER = UART_IER_MSI;
589
590         /* remember current state of the DCD and CTS bits */
591         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
592
593         IRQ_ports = info;
594
595         info->MCR = 0;
596         if (info->tty->termios->c_cflag & CBAUD)
597           info->MCR = SER_DTR | SER_RTS;
598         rtsdtr_ctrl(info->MCR);
599
600         if (info->tty)
601                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
602         info->xmit.head = info->xmit.tail = 0;
603
604         /*
605          * Set up the tty->alt_speed kludge
606          */
607         if (info->tty) {
608                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
609                         info->tty->alt_speed = 57600;
610                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
611                         info->tty->alt_speed = 115200;
612                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
613                         info->tty->alt_speed = 230400;
614                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
615                         info->tty->alt_speed = 460800;
616         }
617
618         /*
619          * and set the speed of the serial port
620          */
621         change_speed(info, NULL);
622
623         info->flags |= ASYNC_INITIALIZED;
624         local_irq_restore(flags);
625         return 0;
626
627 errout:
628         local_irq_restore(flags);
629         return retval;
630 }
631
632 /*
633  * This routine will shutdown a serial port; interrupts are disabled, and
634  * DTR is dropped if the hangup on close termio flag is on.
635  */
636 static void shutdown(struct async_struct * info)
637 {
638         unsigned long   flags;
639         struct serial_state *state;
640
641         if (!(info->flags & ASYNC_INITIALIZED))
642                 return;
643
644         state = info->state;
645
646 #ifdef SERIAL_DEBUG_OPEN
647         printk("Shutting down serial port %d ....\n", info->line);
648 #endif
649
650         local_irq_save(flags); /* Disable interrupts */
651
652         /*
653          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
654          * here so the queue might never be waken up
655          */
656         wake_up_interruptible(&info->delta_msr_wait);
657
658         IRQ_ports = NULL;
659
660         /*
661          * Free the IRQ, if necessary
662          */
663         free_irq(IRQ_AMIGA_VERTB, info);
664
665         if (info->xmit.buf) {
666                 free_page((unsigned long) info->xmit.buf);
667                 info->xmit.buf = NULL;
668         }
669
670         info->IER = 0;
671         custom.intena = IF_RBF | IF_TBE;
672         mb();
673
674         /* disable break condition */
675         custom.adkcon = AC_UARTBRK;
676         mb();
677
678         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
679                 info->MCR &= ~(SER_DTR|SER_RTS);
680         rtsdtr_ctrl(info->MCR);
681
682         if (info->tty)
683                 set_bit(TTY_IO_ERROR, &info->tty->flags);
684
685         info->flags &= ~ASYNC_INITIALIZED;
686         local_irq_restore(flags);
687 }
688
689
690 /*
691  * This routine is called to set the UART divisor registers to match
692  * the specified baud rate for a serial port.
693  */
694 static void change_speed(struct async_struct *info,
695                          struct ktermios *old_termios)
696 {
697         int     quot = 0, baud_base, baud;
698         unsigned cflag, cval = 0;
699         int     bits;
700         unsigned long   flags;
701
702         if (!info->tty || !info->tty->termios)
703                 return;
704         cflag = info->tty->termios->c_cflag;
705
706         /* Byte size is always 8 bits plus parity bit if requested */
707
708         cval = 3; bits = 10;
709         if (cflag & CSTOPB) {
710                 cval |= 0x04;
711                 bits++;
712         }
713         if (cflag & PARENB) {
714                 cval |= UART_LCR_PARITY;
715                 bits++;
716         }
717         if (!(cflag & PARODD))
718                 cval |= UART_LCR_EPAR;
719 #ifdef CMSPAR
720         if (cflag & CMSPAR)
721                 cval |= UART_LCR_SPAR;
722 #endif
723
724         /* Determine divisor based on baud rate */
725         baud = tty_get_baud_rate(info->tty);
726         if (!baud)
727                 baud = 9600;    /* B0 transition handled in rs_set_termios */
728         baud_base = info->state->baud_base;
729         if (baud == 38400 &&
730             ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
731                 quot = info->state->custom_divisor;
732         else {
733                 if (baud == 134)
734                         /* Special case since 134 is really 134.5 */
735                         quot = (2*baud_base / 269);
736                 else if (baud)
737                         quot = baud_base / baud;
738         }
739         /* If the quotient is zero refuse the change */
740         if (!quot && old_termios) {
741                 /* FIXME: Will need updating for new tty in the end */
742                 info->tty->termios->c_cflag &= ~CBAUD;
743                 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
744                 baud = tty_get_baud_rate(info->tty);
745                 if (!baud)
746                         baud = 9600;
747                 if (baud == 38400 &&
748                     ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
749                         quot = info->state->custom_divisor;
750                 else {
751                         if (baud == 134)
752                                 /* Special case since 134 is really 134.5 */
753                                 quot = (2*baud_base / 269);
754                         else if (baud)
755                                 quot = baud_base / baud;
756                 }
757         }
758         /* As a last resort, if the quotient is zero, default to 9600 bps */
759         if (!quot)
760                 quot = baud_base / 9600;
761         info->quot = quot;
762         info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
763         info->timeout += HZ/50;         /* Add .02 seconds of slop */
764
765         /* CTS flow control flag and modem status interrupts */
766         info->IER &= ~UART_IER_MSI;
767         if (info->flags & ASYNC_HARDPPS_CD)
768                 info->IER |= UART_IER_MSI;
769         if (cflag & CRTSCTS) {
770                 info->flags |= ASYNC_CTS_FLOW;
771                 info->IER |= UART_IER_MSI;
772         } else
773                 info->flags &= ~ASYNC_CTS_FLOW;
774         if (cflag & CLOCAL)
775                 info->flags &= ~ASYNC_CHECK_CD;
776         else {
777                 info->flags |= ASYNC_CHECK_CD;
778                 info->IER |= UART_IER_MSI;
779         }
780         /* TBD:
781          * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
782          */
783
784         /*
785          * Set up parity check flag
786          */
787
788         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
789         if (I_INPCK(info->tty))
790                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
791         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
792                 info->read_status_mask |= UART_LSR_BI;
793
794         /*
795          * Characters to ignore
796          */
797         info->ignore_status_mask = 0;
798         if (I_IGNPAR(info->tty))
799                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
800         if (I_IGNBRK(info->tty)) {
801                 info->ignore_status_mask |= UART_LSR_BI;
802                 /*
803                  * If we're ignore parity and break indicators, ignore 
804                  * overruns too.  (For real raw support).
805                  */
806                 if (I_IGNPAR(info->tty))
807                         info->ignore_status_mask |= UART_LSR_OE;
808         }
809         /*
810          * !!! ignore all characters if CREAD is not set
811          */
812         if ((cflag & CREAD) == 0)
813                 info->ignore_status_mask |= UART_LSR_DR;
814         local_irq_save(flags);
815
816         {
817           short serper;
818
819         /* Set up the baud rate */
820           serper = quot - 1;
821
822         /* Enable or disable parity bit */
823
824         if(cval & UART_LCR_PARITY)
825           serper |= (SERPER_PARENB);
826
827         custom.serper = serper;
828         mb();
829         }
830
831         info->LCR = cval;                               /* Save LCR */
832         local_irq_restore(flags);
833 }
834
835 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
836 {
837         struct async_struct *info;
838         unsigned long flags;
839
840         if (!tty)
841                 return 0;
842
843         info = tty->driver_data;
844
845         if (serial_paranoia_check(info, tty->name, "rs_put_char"))
846                 return 0;
847
848         if (!info->xmit.buf)
849                 return 0;
850
851         local_irq_save(flags);
852         if (CIRC_SPACE(info->xmit.head,
853                        info->xmit.tail,
854                        SERIAL_XMIT_SIZE) == 0) {
855                 local_irq_restore(flags);
856                 return 0;
857         }
858
859         info->xmit.buf[info->xmit.head++] = ch;
860         info->xmit.head &= SERIAL_XMIT_SIZE-1;
861         local_irq_restore(flags);
862         return 1;
863 }
864
865 static void rs_flush_chars(struct tty_struct *tty)
866 {
867         struct async_struct *info = (struct async_struct *)tty->driver_data;
868         unsigned long flags;
869
870         if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
871                 return;
872
873         if (info->xmit.head == info->xmit.tail
874             || tty->stopped
875             || tty->hw_stopped
876             || !info->xmit.buf)
877                 return;
878
879         local_irq_save(flags);
880         info->IER |= UART_IER_THRI;
881         custom.intena = IF_SETCLR | IF_TBE;
882         mb();
883         /* set a pending Tx Interrupt, transmitter should restart now */
884         custom.intreq = IF_SETCLR | IF_TBE;
885         mb();
886         local_irq_restore(flags);
887 }
888
889 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
890 {
891         int     c, ret = 0;
892         struct async_struct *info;
893         unsigned long flags;
894
895         if (!tty)
896                 return 0;
897
898         info = tty->driver_data;
899
900         if (serial_paranoia_check(info, tty->name, "rs_write"))
901                 return 0;
902
903         if (!info->xmit.buf)
904                 return 0;
905
906         local_irq_save(flags);
907         while (1) {
908                 c = CIRC_SPACE_TO_END(info->xmit.head,
909                                       info->xmit.tail,
910                                       SERIAL_XMIT_SIZE);
911                 if (count < c)
912                         c = count;
913                 if (c <= 0) {
914                         break;
915                 }
916                 memcpy(info->xmit.buf + info->xmit.head, buf, c);
917                 info->xmit.head = ((info->xmit.head + c) &
918                                    (SERIAL_XMIT_SIZE-1));
919                 buf += c;
920                 count -= c;
921                 ret += c;
922         }
923         local_irq_restore(flags);
924
925         if (info->xmit.head != info->xmit.tail
926             && !tty->stopped
927             && !tty->hw_stopped
928             && !(info->IER & UART_IER_THRI)) {
929                 info->IER |= UART_IER_THRI;
930                 local_irq_disable();
931                 custom.intena = IF_SETCLR | IF_TBE;
932                 mb();
933                 /* set a pending Tx Interrupt, transmitter should restart now */
934                 custom.intreq = IF_SETCLR | IF_TBE;
935                 mb();
936                 local_irq_restore(flags);
937         }
938         return ret;
939 }
940
941 static int rs_write_room(struct tty_struct *tty)
942 {
943         struct async_struct *info = (struct async_struct *)tty->driver_data;
944
945         if (serial_paranoia_check(info, tty->name, "rs_write_room"))
946                 return 0;
947         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
948 }
949
950 static int rs_chars_in_buffer(struct tty_struct *tty)
951 {
952         struct async_struct *info = (struct async_struct *)tty->driver_data;
953
954         if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
955                 return 0;
956         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
957 }
958
959 static void rs_flush_buffer(struct tty_struct *tty)
960 {
961         struct async_struct *info = (struct async_struct *)tty->driver_data;
962         unsigned long flags;
963
964         if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
965                 return;
966         local_irq_save(flags);
967         info->xmit.head = info->xmit.tail = 0;
968         local_irq_restore(flags);
969         tty_wakeup(tty);
970 }
971
972 /*
973  * This function is used to send a high-priority XON/XOFF character to
974  * the device
975  */
976 static void rs_send_xchar(struct tty_struct *tty, char ch)
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_send_char"))
982                 return;
983
984         info->x_char = ch;
985         if (ch) {
986                 /* Make sure transmit interrupts are on */
987
988                 /* Check this ! */
989                 local_irq_save(flags);
990                 if(!(custom.intenar & IF_TBE)) {
991                     custom.intena = IF_SETCLR | IF_TBE;
992                     mb();
993                     /* set a pending Tx Interrupt, transmitter should restart now */
994                     custom.intreq = IF_SETCLR | IF_TBE;
995                     mb();
996                 }
997                 local_irq_restore(flags);
998
999                 info->IER |= UART_IER_THRI;
1000         }
1001 }
1002
1003 /*
1004  * ------------------------------------------------------------
1005  * rs_throttle()
1006  * 
1007  * This routine is called by the upper-layer tty layer to signal that
1008  * incoming characters should be throttled.
1009  * ------------------------------------------------------------
1010  */
1011 static void rs_throttle(struct tty_struct * tty)
1012 {
1013         struct async_struct *info = (struct async_struct *)tty->driver_data;
1014         unsigned long flags;
1015 #ifdef SERIAL_DEBUG_THROTTLE
1016         char    buf[64];
1017
1018         printk("throttle %s: %d....\n", tty_name(tty, buf),
1019                tty->ldisc.chars_in_buffer(tty));
1020 #endif
1021
1022         if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1023                 return;
1024
1025         if (I_IXOFF(tty))
1026                 rs_send_xchar(tty, STOP_CHAR(tty));
1027
1028         if (tty->termios->c_cflag & CRTSCTS)
1029                 info->MCR &= ~SER_RTS;
1030
1031         local_irq_save(flags);
1032         rtsdtr_ctrl(info->MCR);
1033         local_irq_restore(flags);
1034 }
1035
1036 static void rs_unthrottle(struct tty_struct * tty)
1037 {
1038         struct async_struct *info = (struct async_struct *)tty->driver_data;
1039         unsigned long flags;
1040 #ifdef SERIAL_DEBUG_THROTTLE
1041         char    buf[64];
1042
1043         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1044                tty->ldisc.chars_in_buffer(tty));
1045 #endif
1046
1047         if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1048                 return;
1049
1050         if (I_IXOFF(tty)) {
1051                 if (info->x_char)
1052                         info->x_char = 0;
1053                 else
1054                         rs_send_xchar(tty, START_CHAR(tty));
1055         }
1056         if (tty->termios->c_cflag & CRTSCTS)
1057                 info->MCR |= SER_RTS;
1058         local_irq_save(flags);
1059         rtsdtr_ctrl(info->MCR);
1060         local_irq_restore(flags);
1061 }
1062
1063 /*
1064  * ------------------------------------------------------------
1065  * rs_ioctl() and friends
1066  * ------------------------------------------------------------
1067  */
1068
1069 static int get_serial_info(struct async_struct * info,
1070                            struct serial_struct __user * retinfo)
1071 {
1072         struct serial_struct tmp;
1073         struct serial_state *state = info->state;
1074    
1075         if (!retinfo)
1076                 return -EFAULT;
1077         memset(&tmp, 0, sizeof(tmp));
1078         lock_kernel();
1079         tmp.type = state->type;
1080         tmp.line = state->line;
1081         tmp.port = state->port;
1082         tmp.irq = state->irq;
1083         tmp.flags = state->flags;
1084         tmp.xmit_fifo_size = state->xmit_fifo_size;
1085         tmp.baud_base = state->baud_base;
1086         tmp.close_delay = state->close_delay;
1087         tmp.closing_wait = state->closing_wait;
1088         tmp.custom_divisor = state->custom_divisor;
1089         unlock_kernel();
1090         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1091                 return -EFAULT;
1092         return 0;
1093 }
1094
1095 static int set_serial_info(struct async_struct * info,
1096                            struct serial_struct __user * new_info)
1097 {
1098         struct serial_struct new_serial;
1099         struct serial_state old_state, *state;
1100         unsigned int            change_irq,change_port;
1101         int                     retval = 0;
1102
1103         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1104                 return -EFAULT;
1105
1106         lock_kernel();
1107         state = info->state;
1108         old_state = *state;
1109   
1110         change_irq = new_serial.irq != state->irq;
1111         change_port = (new_serial.port != state->port);
1112         if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
1113           unlock_kernel();
1114           return -EINVAL;
1115         }
1116   
1117         if (!serial_isroot()) {
1118                 if ((new_serial.baud_base != state->baud_base) ||
1119                     (new_serial.close_delay != state->close_delay) ||
1120                     (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1121                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1122                      (state->flags & ~ASYNC_USR_MASK)))
1123                         return -EPERM;
1124                 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1125                                (new_serial.flags & ASYNC_USR_MASK));
1126                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1127                                (new_serial.flags & ASYNC_USR_MASK));
1128                 state->custom_divisor = new_serial.custom_divisor;
1129                 goto check_and_exit;
1130         }
1131
1132         if (new_serial.baud_base < 9600) {
1133                 unlock_kernel();
1134                 return -EINVAL;
1135         }
1136
1137         /*
1138          * OK, past this point, all the error checking has been done.
1139          * At this point, we start making changes.....
1140          */
1141
1142         state->baud_base = new_serial.baud_base;
1143         state->flags = ((state->flags & ~ASYNC_FLAGS) |
1144                         (new_serial.flags & ASYNC_FLAGS));
1145         info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1146                        (info->flags & ASYNC_INTERNAL_FLAGS));
1147         state->custom_divisor = new_serial.custom_divisor;
1148         state->close_delay = new_serial.close_delay * HZ/100;
1149         state->closing_wait = new_serial.closing_wait * HZ/100;
1150         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1151
1152 check_and_exit:
1153         if (info->flags & ASYNC_INITIALIZED) {
1154                 if (((old_state.flags & ASYNC_SPD_MASK) !=
1155                      (state->flags & ASYNC_SPD_MASK)) ||
1156                     (old_state.custom_divisor != state->custom_divisor)) {
1157                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1158                                 info->tty->alt_speed = 57600;
1159                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1160                                 info->tty->alt_speed = 115200;
1161                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1162                                 info->tty->alt_speed = 230400;
1163                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1164                                 info->tty->alt_speed = 460800;
1165                         change_speed(info, NULL);
1166                 }
1167         } else
1168                 retval = startup(info);
1169         unlock_kernel();
1170         return retval;
1171 }
1172
1173
1174 /*
1175  * get_lsr_info - get line status register info
1176  *
1177  * Purpose: Let user call ioctl() to get info when the UART physically
1178  *          is emptied.  On bus types like RS485, the transmitter must
1179  *          release the bus after transmitting. This must be done when
1180  *          the transmit shift register is empty, not be done when the
1181  *          transmit holding register is empty.  This functionality
1182  *          allows an RS485 driver to be written in user space. 
1183  */
1184 static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
1185 {
1186         unsigned char status;
1187         unsigned int result;
1188         unsigned long flags;
1189
1190         local_irq_save(flags);
1191         status = custom.serdatr;
1192         mb();
1193         local_irq_restore(flags);
1194         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1195         if (copy_to_user(value, &result, sizeof(int)))
1196                 return -EFAULT;
1197         return 0;
1198 }
1199
1200
1201 static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1202 {
1203         struct async_struct * info = (struct async_struct *)tty->driver_data;
1204         unsigned char control, status;
1205         unsigned long flags;
1206
1207         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1208                 return -ENODEV;
1209         if (tty->flags & (1 << TTY_IO_ERROR))
1210                 return -EIO;
1211
1212         control = info->MCR;
1213         local_irq_save(flags);
1214         status = ciab.pra;
1215         local_irq_restore(flags);
1216         return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1217                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1218                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1219                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1220                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1221 }
1222
1223 static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1224                        unsigned int set, unsigned int clear)
1225 {
1226         struct async_struct * info = (struct async_struct *)tty->driver_data;
1227         unsigned long flags;
1228
1229         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1230                 return -ENODEV;
1231         if (tty->flags & (1 << TTY_IO_ERROR))
1232                 return -EIO;
1233
1234         local_irq_save(flags);
1235         if (set & TIOCM_RTS)
1236                 info->MCR |= SER_RTS;
1237         if (set & TIOCM_DTR)
1238                 info->MCR |= SER_DTR;
1239         if (clear & TIOCM_RTS)
1240                 info->MCR &= ~SER_RTS;
1241         if (clear & TIOCM_DTR)
1242                 info->MCR &= ~SER_DTR;
1243         rtsdtr_ctrl(info->MCR);
1244         local_irq_restore(flags);
1245         return 0;
1246 }
1247
1248 /*
1249  * rs_break() --- routine which turns the break handling on or off
1250  */
1251 static void rs_break(struct tty_struct *tty, int break_state)
1252 {
1253         struct async_struct * info = (struct async_struct *)tty->driver_data;
1254         unsigned long flags;
1255
1256         if (serial_paranoia_check(info, tty->name, "rs_break"))
1257                 return;
1258
1259         local_irq_save(flags);
1260         if (break_state == -1)
1261           custom.adkcon = AC_SETCLR | AC_UARTBRK;
1262         else
1263           custom.adkcon = AC_UARTBRK;
1264         mb();
1265         local_irq_restore(flags);
1266 }
1267
1268
1269 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1270                     unsigned int cmd, unsigned long arg)
1271 {
1272         struct async_struct * info = (struct async_struct *)tty->driver_data;
1273         struct async_icount cprev, cnow;        /* kernel counter temps */
1274         struct serial_icounter_struct icount;
1275         void __user *argp = (void __user *)arg;
1276         unsigned long flags;
1277
1278         if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1279                 return -ENODEV;
1280
1281         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1282             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1283             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1284                 if (tty->flags & (1 << TTY_IO_ERROR))
1285                     return -EIO;
1286         }
1287
1288         switch (cmd) {
1289                 case TIOCGSERIAL:
1290                         return get_serial_info(info, argp);
1291                 case TIOCSSERIAL:
1292                         return set_serial_info(info, argp);
1293                 case TIOCSERCONFIG:
1294                         return 0;
1295
1296                 case TIOCSERGETLSR: /* Get line status register */
1297                         return get_lsr_info(info, argp);
1298
1299                 case TIOCSERGSTRUCT:
1300                         if (copy_to_user(argp,
1301                                          info, sizeof(struct async_struct)))
1302                                 return -EFAULT;
1303                         return 0;
1304
1305                 /*
1306                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1307                  * - mask passed in arg for lines of interest
1308                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1309                  * Caller should use TIOCGICOUNT to see which one it was
1310                  */
1311                 case TIOCMIWAIT:
1312                         local_irq_save(flags);
1313                         /* note the counters on entry */
1314                         cprev = info->state->icount;
1315                         local_irq_restore(flags);
1316                         while (1) {
1317                                 interruptible_sleep_on(&info->delta_msr_wait);
1318                                 /* see if a signal did it */
1319                                 if (signal_pending(current))
1320                                         return -ERESTARTSYS;
1321                                 local_irq_save(flags);
1322                                 cnow = info->state->icount; /* atomic copy */
1323                                 local_irq_restore(flags);
1324                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 
1325                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1326                                         return -EIO; /* no change => error */
1327                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1328                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1329                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1330                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1331                                         return 0;
1332                                 }
1333                                 cprev = cnow;
1334                         }
1335                         /* NOTREACHED */
1336
1337                 /* 
1338                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1339                  * Return: write counters to the user passed counter struct
1340                  * NB: both 1->0 and 0->1 transitions are counted except for
1341                  *     RI where only 0->1 is counted.
1342                  */
1343                 case TIOCGICOUNT:
1344                         local_irq_save(flags);
1345                         cnow = info->state->icount;
1346                         local_irq_restore(flags);
1347                         icount.cts = cnow.cts;
1348                         icount.dsr = cnow.dsr;
1349                         icount.rng = cnow.rng;
1350                         icount.dcd = cnow.dcd;
1351                         icount.rx = cnow.rx;
1352                         icount.tx = cnow.tx;
1353                         icount.frame = cnow.frame;
1354                         icount.overrun = cnow.overrun;
1355                         icount.parity = cnow.parity;
1356                         icount.brk = cnow.brk;
1357                         icount.buf_overrun = cnow.buf_overrun;
1358
1359                         if (copy_to_user(argp, &icount, sizeof(icount)))
1360                                 return -EFAULT;
1361                         return 0;
1362                 case TIOCSERGWILD:
1363                 case TIOCSERSWILD:
1364                         /* "setserial -W" is called in Debian boot */
1365                         printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1366                         return 0;
1367
1368                 default:
1369                         return -ENOIOCTLCMD;
1370                 }
1371         return 0;
1372 }
1373
1374 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1375 {
1376         struct async_struct *info = (struct async_struct *)tty->driver_data;
1377         unsigned long flags;
1378         unsigned int cflag = tty->termios->c_cflag;
1379
1380         change_speed(info, old_termios);
1381
1382         /* Handle transition to B0 status */
1383         if ((old_termios->c_cflag & CBAUD) &&
1384             !(cflag & CBAUD)) {
1385                 info->MCR &= ~(SER_DTR|SER_RTS);
1386                 local_irq_save(flags);
1387                 rtsdtr_ctrl(info->MCR);
1388                 local_irq_restore(flags);
1389         }
1390
1391         /* Handle transition away from B0 status */
1392         if (!(old_termios->c_cflag & CBAUD) &&
1393             (cflag & CBAUD)) {
1394                 info->MCR |= SER_DTR;
1395                 if (!(tty->termios->c_cflag & CRTSCTS) || 
1396                     !test_bit(TTY_THROTTLED, &tty->flags)) {
1397                         info->MCR |= SER_RTS;
1398                 }
1399                 local_irq_save(flags);
1400                 rtsdtr_ctrl(info->MCR);
1401                 local_irq_restore(flags);
1402         }
1403
1404         /* Handle turning off CRTSCTS */
1405         if ((old_termios->c_cflag & CRTSCTS) &&
1406             !(tty->termios->c_cflag & CRTSCTS)) {
1407                 tty->hw_stopped = 0;
1408                 rs_start(tty);
1409         }
1410
1411 #if 0
1412         /*
1413          * No need to wake up processes in open wait, since they
1414          * sample the CLOCAL flag once, and don't recheck it.
1415          * XXX  It's not clear whether the current behavior is correct
1416          * or not.  Hence, this may change.....
1417          */
1418         if (!(old_termios->c_cflag & CLOCAL) &&
1419             (tty->termios->c_cflag & CLOCAL))
1420                 wake_up_interruptible(&info->open_wait);
1421 #endif
1422 }
1423
1424 /*
1425  * ------------------------------------------------------------
1426  * rs_close()
1427  * 
1428  * This routine is called when the serial port gets closed.  First, we
1429  * wait for the last remaining data to be sent.  Then, we unlink its
1430  * async structure from the interrupt chain if necessary, and we free
1431  * that IRQ if nothing is left in the chain.
1432  * ------------------------------------------------------------
1433  */
1434 static void rs_close(struct tty_struct *tty, struct file * filp)
1435 {
1436         struct async_struct * info = (struct async_struct *)tty->driver_data;
1437         struct serial_state *state;
1438         unsigned long flags;
1439
1440         if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1441                 return;
1442
1443         state = info->state;
1444
1445         local_irq_save(flags);
1446
1447         if (tty_hung_up_p(filp)) {
1448                 DBG_CNT("before DEC-hung");
1449                 local_irq_restore(flags);
1450                 return;
1451         }
1452
1453 #ifdef SERIAL_DEBUG_OPEN
1454         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1455 #endif
1456         if ((tty->count == 1) && (state->count != 1)) {
1457                 /*
1458                  * Uh, oh.  tty->count is 1, which means that the tty
1459                  * structure will be freed.  state->count should always
1460                  * be one in these conditions.  If it's greater than
1461                  * one, we've got real problems, since it means the
1462                  * serial port won't be shutdown.
1463                  */
1464                 printk("rs_close: bad serial port count; tty->count is 1, "
1465                        "state->count is %d\n", state->count);
1466                 state->count = 1;
1467         }
1468         if (--state->count < 0) {
1469                 printk("rs_close: bad serial port count for ttys%d: %d\n",
1470                        info->line, state->count);
1471                 state->count = 0;
1472         }
1473         if (state->count) {
1474                 DBG_CNT("before DEC-2");
1475                 local_irq_restore(flags);
1476                 return;
1477         }
1478         info->flags |= ASYNC_CLOSING;
1479         /*
1480          * Now we wait for the transmit buffer to clear; and we notify 
1481          * the line discipline to only process XON/XOFF characters.
1482          */
1483         tty->closing = 1;
1484         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1485                 tty_wait_until_sent(tty, info->closing_wait);
1486         /*
1487          * At this point we stop accepting input.  To do this, we
1488          * disable the receive line status interrupts, and tell the
1489          * interrupt driver to stop checking the data ready bit in the
1490          * line status register.
1491          */
1492         info->read_status_mask &= ~UART_LSR_DR;
1493         if (info->flags & ASYNC_INITIALIZED) {
1494                 /* disable receive interrupts */
1495                 custom.intena = IF_RBF;
1496                 mb();
1497                 /* clear any pending receive interrupt */
1498                 custom.intreq = IF_RBF;
1499                 mb();
1500
1501                 /*
1502                  * Before we drop DTR, make sure the UART transmitter
1503                  * has completely drained; this is especially
1504                  * important if there is a transmit FIFO!
1505                  */
1506                 rs_wait_until_sent(tty, info->timeout);
1507         }
1508         shutdown(info);
1509         rs_flush_buffer(tty);
1510                 
1511         tty_ldisc_flush(tty);
1512         tty->closing = 0;
1513         info->event = 0;
1514         info->tty = NULL;
1515         if (info->blocked_open) {
1516                 if (info->close_delay) {
1517                         msleep_interruptible(jiffies_to_msecs(info->close_delay));
1518                 }
1519                 wake_up_interruptible(&info->open_wait);
1520         }
1521         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1522         wake_up_interruptible(&info->close_wait);
1523         local_irq_restore(flags);
1524 }
1525
1526 /*
1527  * rs_wait_until_sent() --- wait until the transmitter is empty
1528  */
1529 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1530 {
1531         struct async_struct * info = (struct async_struct *)tty->driver_data;
1532         unsigned long orig_jiffies, char_time;
1533         int lsr;
1534
1535         if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1536                 return;
1537
1538         if (info->xmit_fifo_size == 0)
1539                 return; /* Just in case.... */
1540
1541         orig_jiffies = jiffies;
1542
1543         lock_kernel();
1544         /*
1545          * Set the check interval to be 1/5 of the estimated time to
1546          * send a single character, and make it at least 1.  The check
1547          * interval should also be less than the timeout.
1548          * 
1549          * Note: we have to use pretty tight timings here to satisfy
1550          * the NIST-PCTS.
1551          */
1552         char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1553         char_time = char_time / 5;
1554         if (char_time == 0)
1555                 char_time = 1;
1556         if (timeout)
1557           char_time = min_t(unsigned long, char_time, timeout);
1558         /*
1559          * If the transmitter hasn't cleared in twice the approximate
1560          * amount of time to send the entire FIFO, it probably won't
1561          * ever clear.  This assumes the UART isn't doing flow
1562          * control, which is currently the case.  Hence, if it ever
1563          * takes longer than info->timeout, this is probably due to a
1564          * UART bug of some kind.  So, we clamp the timeout parameter at
1565          * 2*info->timeout.
1566          */
1567         if (!timeout || timeout > 2*info->timeout)
1568                 timeout = 2*info->timeout;
1569 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1570         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1571         printk("jiff=%lu...", jiffies);
1572 #endif
1573         while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1574 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1575                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1576 #endif
1577                 msleep_interruptible(jiffies_to_msecs(char_time));
1578                 if (signal_pending(current))
1579                         break;
1580                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1581                         break;
1582         }
1583         __set_current_state(TASK_RUNNING);
1584         unlock_kernel();
1585 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1586         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1587 #endif
1588 }
1589
1590 /*
1591  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1592  */
1593 static void rs_hangup(struct tty_struct *tty)
1594 {
1595         struct async_struct * info = (struct async_struct *)tty->driver_data;
1596         struct serial_state *state = info->state;
1597
1598         if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1599                 return;
1600
1601         state = info->state;
1602
1603         rs_flush_buffer(tty);
1604         shutdown(info);
1605         info->event = 0;
1606         state->count = 0;
1607         info->flags &= ~ASYNC_NORMAL_ACTIVE;
1608         info->tty = NULL;
1609         wake_up_interruptible(&info->open_wait);
1610 }
1611
1612 /*
1613  * ------------------------------------------------------------
1614  * rs_open() and friends
1615  * ------------------------------------------------------------
1616  */
1617 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1618                            struct async_struct *info)
1619 {
1620 #ifdef DECLARE_WAITQUEUE
1621         DECLARE_WAITQUEUE(wait, current);
1622 #else
1623         struct wait_queue wait = { current, NULL };
1624 #endif
1625         struct serial_state *state = info->state;
1626         int             retval;
1627         int             do_clocal = 0, extra_count = 0;
1628         unsigned long   flags;
1629
1630         /*
1631          * If the device is in the middle of being closed, then block
1632          * until it's done, and then try again.
1633          */
1634         if (tty_hung_up_p(filp) ||
1635             (info->flags & ASYNC_CLOSING)) {
1636                 if (info->flags & ASYNC_CLOSING)
1637                         interruptible_sleep_on(&info->close_wait);
1638 #ifdef SERIAL_DO_RESTART
1639                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1640                         -EAGAIN : -ERESTARTSYS);
1641 #else
1642                 return -EAGAIN;
1643 #endif
1644         }
1645
1646         /*
1647          * If non-blocking mode is set, or the port is not enabled,
1648          * then make the check up front and then exit.
1649          */
1650         if ((filp->f_flags & O_NONBLOCK) ||
1651             (tty->flags & (1 << TTY_IO_ERROR))) {
1652                 info->flags |= ASYNC_NORMAL_ACTIVE;
1653                 return 0;
1654         }
1655
1656         if (tty->termios->c_cflag & CLOCAL)
1657                 do_clocal = 1;
1658
1659         /*
1660          * Block waiting for the carrier detect and the line to become
1661          * free (i.e., not in use by the callout).  While we are in
1662          * this loop, state->count is dropped by one, so that
1663          * rs_close() knows when to free things.  We restore it upon
1664          * exit, either normal or abnormal.
1665          */
1666         retval = 0;
1667         add_wait_queue(&info->open_wait, &wait);
1668 #ifdef SERIAL_DEBUG_OPEN
1669         printk("block_til_ready before block: ttys%d, count = %d\n",
1670                state->line, state->count);
1671 #endif
1672         local_irq_save(flags);
1673         if (!tty_hung_up_p(filp)) {
1674                 extra_count = 1;
1675                 state->count--;
1676         }
1677         local_irq_restore(flags);
1678         info->blocked_open++;
1679         while (1) {
1680                 local_irq_save(flags);
1681                 if (tty->termios->c_cflag & CBAUD)
1682                         rtsdtr_ctrl(SER_DTR|SER_RTS);
1683                 local_irq_restore(flags);
1684                 set_current_state(TASK_INTERRUPTIBLE);
1685                 if (tty_hung_up_p(filp) ||
1686                     !(info->flags & ASYNC_INITIALIZED)) {
1687 #ifdef SERIAL_DO_RESTART
1688                         if (info->flags & ASYNC_HUP_NOTIFY)
1689                                 retval = -EAGAIN;
1690                         else
1691                                 retval = -ERESTARTSYS;
1692 #else
1693                         retval = -EAGAIN;
1694 #endif
1695                         break;
1696                 }
1697                 if (!(info->flags & ASYNC_CLOSING) &&
1698                     (do_clocal || (!(ciab.pra & SER_DCD)) ))
1699                         break;
1700                 if (signal_pending(current)) {
1701                         retval = -ERESTARTSYS;
1702                         break;
1703                 }
1704 #ifdef SERIAL_DEBUG_OPEN
1705                 printk("block_til_ready blocking: ttys%d, count = %d\n",
1706                        info->line, state->count);
1707 #endif
1708                 schedule();
1709         }
1710         __set_current_state(TASK_RUNNING);
1711         remove_wait_queue(&info->open_wait, &wait);
1712         if (extra_count)
1713                 state->count++;
1714         info->blocked_open--;
1715 #ifdef SERIAL_DEBUG_OPEN
1716         printk("block_til_ready after blocking: ttys%d, count = %d\n",
1717                info->line, state->count);
1718 #endif
1719         if (retval)
1720                 return retval;
1721         info->flags |= ASYNC_NORMAL_ACTIVE;
1722         return 0;
1723 }
1724
1725 static int get_async_struct(int line, struct async_struct **ret_info)
1726 {
1727         struct async_struct *info;
1728         struct serial_state *sstate;
1729
1730         sstate = rs_table + line;
1731         sstate->count++;
1732         if (sstate->info) {
1733                 *ret_info = sstate->info;
1734                 return 0;
1735         }
1736         info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1737         if (!info) {
1738                 sstate->count--;
1739                 return -ENOMEM;
1740         }
1741 #ifdef DECLARE_WAITQUEUE
1742         init_waitqueue_head(&info->open_wait);
1743         init_waitqueue_head(&info->close_wait);
1744         init_waitqueue_head(&info->delta_msr_wait);
1745 #endif
1746         info->magic = SERIAL_MAGIC;
1747         info->port = sstate->port;
1748         info->flags = sstate->flags;
1749         info->xmit_fifo_size = sstate->xmit_fifo_size;
1750         info->line = line;
1751         tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1752         info->state = sstate;
1753         if (sstate->info) {
1754                 kfree(info);
1755                 *ret_info = sstate->info;
1756                 return 0;
1757         }
1758         *ret_info = sstate->info = info;
1759         return 0;
1760 }
1761
1762 /*
1763  * This routine is called whenever a serial port is opened.  It
1764  * enables interrupts for a serial port, linking in its async structure into
1765  * the IRQ chain.   It also performs the serial-specific
1766  * initialization for the tty structure.
1767  */
1768 static int rs_open(struct tty_struct *tty, struct file * filp)
1769 {
1770         struct async_struct     *info;
1771         int                     retval, line;
1772
1773         line = tty->index;
1774         if ((line < 0) || (line >= NR_PORTS)) {
1775                 return -ENODEV;
1776         }
1777         retval = get_async_struct(line, &info);
1778         if (retval) {
1779                 return retval;
1780         }
1781         tty->driver_data = info;
1782         info->tty = tty;
1783         if (serial_paranoia_check(info, tty->name, "rs_open"))
1784                 return -ENODEV;
1785
1786 #ifdef SERIAL_DEBUG_OPEN
1787         printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1788 #endif
1789         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1790
1791         /*
1792          * If the port is the middle of closing, bail out now
1793          */
1794         if (tty_hung_up_p(filp) ||
1795             (info->flags & ASYNC_CLOSING)) {
1796                 if (info->flags & ASYNC_CLOSING)
1797                         interruptible_sleep_on(&info->close_wait);
1798 #ifdef SERIAL_DO_RESTART
1799                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1800                         -EAGAIN : -ERESTARTSYS);
1801 #else
1802                 return -EAGAIN;
1803 #endif
1804         }
1805
1806         /*
1807          * Start up serial port
1808          */
1809         retval = startup(info);
1810         if (retval) {
1811                 return retval;
1812         }
1813
1814         retval = block_til_ready(tty, filp, info);
1815         if (retval) {
1816 #ifdef SERIAL_DEBUG_OPEN
1817                 printk("rs_open returning after block_til_ready with %d\n",
1818                        retval);
1819 #endif
1820                 return retval;
1821         }
1822
1823 #ifdef SERIAL_DEBUG_OPEN
1824         printk("rs_open %s successful...", tty->name);
1825 #endif
1826         return 0;
1827 }
1828
1829 /*
1830  * /proc fs routines....
1831  */
1832
1833 static inline int line_info(char *buf, struct serial_state *state)
1834 {
1835         struct async_struct *info = state->info, scr_info;
1836         char    stat_buf[30], control, status;
1837         int     ret;
1838         unsigned long flags;
1839
1840         ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1841
1842         /*
1843          * Figure out the current RS-232 lines
1844          */
1845         if (!info) {
1846                 info = &scr_info;       /* This is just for serial_{in,out} */
1847
1848                 info->magic = SERIAL_MAGIC;
1849                 info->flags = state->flags;
1850                 info->quot = 0;
1851                 info->tty = NULL;
1852         }
1853         local_irq_save(flags);
1854         status = ciab.pra;
1855         control = info ? info->MCR : status;
1856         local_irq_restore(flags);
1857
1858         stat_buf[0] = 0;
1859         stat_buf[1] = 0;
1860         if(!(control & SER_RTS))
1861                 strcat(stat_buf, "|RTS");
1862         if(!(status & SER_CTS))
1863                 strcat(stat_buf, "|CTS");
1864         if(!(control & SER_DTR))
1865                 strcat(stat_buf, "|DTR");
1866         if(!(status & SER_DSR))
1867                 strcat(stat_buf, "|DSR");
1868         if(!(status & SER_DCD))
1869                 strcat(stat_buf, "|CD");
1870
1871         if (info->quot) {
1872                 ret += sprintf(buf+ret, " baud:%d",
1873                                state->baud_base / info->quot);
1874         }
1875
1876         ret += sprintf(buf+ret, " tx:%d rx:%d",
1877                       state->icount.tx, state->icount.rx);
1878
1879         if (state->icount.frame)
1880                 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1881
1882         if (state->icount.parity)
1883                 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1884
1885         if (state->icount.brk)
1886                 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1887
1888         if (state->icount.overrun)
1889                 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1890
1891         /*
1892          * Last thing is the RS-232 status lines
1893          */
1894         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1895         return ret;
1896 }
1897
1898 static int rs_read_proc(char *page, char **start, off_t off, int count,
1899                         int *eof, void *data)
1900 {
1901         int len = 0, l;
1902         off_t   begin = 0;
1903
1904         len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1905         l = line_info(page + len, &rs_table[0]);
1906         len += l;
1907         if (len+begin > off+count)
1908           goto done;
1909         if (len+begin < off) {
1910           begin += len;
1911           len = 0;
1912         }
1913         *eof = 1;
1914 done:
1915         if (off >= len+begin)
1916                 return 0;
1917         *start = page + (off-begin);
1918         return ((count < begin+len-off) ? count : begin+len-off);
1919 }
1920
1921 /*
1922  * ---------------------------------------------------------------------
1923  * rs_init() and friends
1924  *
1925  * rs_init() is called at boot-time to initialize the serial driver.
1926  * ---------------------------------------------------------------------
1927  */
1928
1929 /*
1930  * This routine prints out the appropriate serial driver version
1931  * number, and identifies which options were configured into this
1932  * driver.
1933  */
1934 static void show_serial_version(void)
1935 {
1936         printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1937 }
1938
1939
1940 static const struct tty_operations serial_ops = {
1941         .open = rs_open,
1942         .close = rs_close,
1943         .write = rs_write,
1944         .put_char = rs_put_char,
1945         .flush_chars = rs_flush_chars,
1946         .write_room = rs_write_room,
1947         .chars_in_buffer = rs_chars_in_buffer,
1948         .flush_buffer = rs_flush_buffer,
1949         .ioctl = rs_ioctl,
1950         .throttle = rs_throttle,
1951         .unthrottle = rs_unthrottle,
1952         .set_termios = rs_set_termios,
1953         .stop = rs_stop,
1954         .start = rs_start,
1955         .hangup = rs_hangup,
1956         .break_ctl = rs_break,
1957         .send_xchar = rs_send_xchar,
1958         .wait_until_sent = rs_wait_until_sent,
1959         .read_proc = rs_read_proc,
1960         .tiocmget = rs_tiocmget,
1961         .tiocmset = rs_tiocmset,
1962 };
1963
1964 /*
1965  * The serial driver boot-time initialization code!
1966  */
1967 static int __init rs_init(void)
1968 {
1969         unsigned long flags;
1970         struct serial_state * state;
1971
1972         if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
1973                 return -ENODEV;
1974
1975         serial_driver = alloc_tty_driver(1);
1976         if (!serial_driver)
1977                 return -ENOMEM;
1978
1979         /*
1980          *  We request SERDAT and SERPER only, because the serial registers are
1981          *  too spreaded over the custom register space
1982          */
1983         if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
1984                 return -EBUSY;
1985
1986         IRQ_ports = NULL;
1987
1988         show_serial_version();
1989
1990         /* Initialize the tty_driver structure */
1991
1992         serial_driver->owner = THIS_MODULE;
1993         serial_driver->driver_name = "amiserial";
1994         serial_driver->name = "ttyS";
1995         serial_driver->major = TTY_MAJOR;
1996         serial_driver->minor_start = 64;
1997         serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1998         serial_driver->subtype = SERIAL_TYPE_NORMAL;
1999         serial_driver->init_termios = tty_std_termios;
2000         serial_driver->init_termios.c_cflag =
2001                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2002         serial_driver->flags = TTY_DRIVER_REAL_RAW;
2003         tty_set_operations(serial_driver, &serial_ops);
2004
2005         if (tty_register_driver(serial_driver))
2006                 panic("Couldn't register serial driver\n");
2007
2008         state = rs_table;
2009         state->magic = SSTATE_MAGIC;
2010         state->port = (int)&custom.serdatr; /* Just to give it a value */
2011         state->line = 0;
2012         state->custom_divisor = 0;
2013         state->close_delay = 5*HZ/10;
2014         state->closing_wait = 30*HZ;
2015         state->icount.cts = state->icount.dsr = 
2016           state->icount.rng = state->icount.dcd = 0;
2017         state->icount.rx = state->icount.tx = 0;
2018         state->icount.frame = state->icount.parity = 0;
2019         state->icount.overrun = state->icount.brk = 0;
2020
2021         printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2022                        state->line);
2023
2024         /* Hardware set up */
2025
2026         state->baud_base = amiga_colorclock;
2027         state->xmit_fifo_size = 1;
2028
2029         local_irq_save(flags);
2030
2031         /* set ISRs, and then disable the rx interrupts */
2032         request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2033         request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, "serial RX", state);
2034
2035         /* turn off Rx and Tx interrupts */
2036         custom.intena = IF_RBF | IF_TBE;
2037         mb();
2038
2039         /* clear any pending interrupt */
2040         custom.intreq = IF_RBF | IF_TBE;
2041         mb();
2042
2043         local_irq_restore(flags);
2044
2045         /*
2046          * set the appropriate directions for the modem control flags,
2047          * and clear RTS and DTR
2048          */
2049         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
2050         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
2051
2052         return 0;
2053 }
2054
2055 static __exit void rs_exit(void) 
2056 {
2057         int error;
2058         struct async_struct *info = rs_table[0].info;
2059
2060         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2061         tasklet_kill(&info->tlet);
2062         if ((error = tty_unregister_driver(serial_driver)))
2063                 printk("SERIAL: failed to unregister serial driver (%d)\n",
2064                        error);
2065         put_tty_driver(serial_driver);
2066
2067         if (info) {
2068           rs_table[0].info = NULL;
2069           kfree(info);
2070         }
2071
2072         release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2073 }
2074
2075 module_init(rs_init)
2076 module_exit(rs_exit)
2077
2078
2079 /*
2080  * ------------------------------------------------------------
2081  * Serial console driver
2082  * ------------------------------------------------------------
2083  */
2084 #ifdef CONFIG_SERIAL_CONSOLE
2085
2086 static void amiga_serial_putc(char c)
2087 {
2088         custom.serdat = (unsigned char)c | 0x100;
2089         while (!(custom.serdatr & 0x2000))
2090                 barrier();
2091 }
2092
2093 /*
2094  *      Print a string to the serial port trying not to disturb
2095  *      any possible real use of the port...
2096  *
2097  *      The console must be locked when we get here.
2098  */
2099 static void serial_console_write(struct console *co, const char *s,
2100                                 unsigned count)
2101 {
2102         unsigned short intena = custom.intenar;
2103
2104         custom.intena = IF_TBE;
2105
2106         while (count--) {
2107                 if (*s == '\n')
2108                         amiga_serial_putc('\r');
2109                 amiga_serial_putc(*s++);
2110         }
2111
2112         custom.intena = IF_SETCLR | (intena & IF_TBE);
2113 }
2114
2115 static struct tty_driver *serial_console_device(struct console *c, int *index)
2116 {
2117         *index = 0;
2118         return serial_driver;
2119 }
2120
2121 static struct console sercons = {
2122         .name =         "ttyS",
2123         .write =        serial_console_write,
2124         .device =       serial_console_device,
2125         .flags =        CON_PRINTBUFFER,
2126         .index =        -1,
2127 };
2128
2129 /*
2130  *      Register console.
2131  */
2132 static int __init amiserial_console_init(void)
2133 {
2134         register_console(&sercons);
2135         return 0;
2136 }
2137 console_initcall(amiserial_console_init);
2138 #endif
2139
2140 MODULE_LICENSE("GPL");