v2.4.1.2 -> v2.4.1.3
[opensuse:kernel.git] / drivers / char / amiserial.c
1 /*
2  *  linux/drivers/char/amiserial.c
3  *
4  * Serial driver for the amiga builtin port.
5  *
6  * This code was created by taking serial.c version 4.30 from kernel
7  * release 2.3.22, replacing all hardware related stuff with the
8  * corresponding amiga hardware actions, and removing all irrelevant
9  * code. As a consequence, it uses many of the constants and names
10  * associated with the registers and bits of 16550 compatible UARTS -
11  * but only to keep track of status, etc in the state variables. It
12  * was done this was to make it easier to keep the code in line with
13  * (non hardware specific) changes to serial.c.
14  *
15  * The port is registered with the tty driver as minor device 64, and
16  * therefore other ports should should only use 65 upwards.
17  *
18  * Richard Lucock 28/12/99
19  *
20  *  Copyright (C) 1991, 1992  Linus Torvalds
21  *  Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 
22  *              1998, 1999  Theodore Ts'o
23  *
24  */
25
26 /*
27  * Serial driver configuration section.  Here are the various options:
28  *
29  * SERIAL_PARANOIA_CHECK
30  *              Check the magic number for the async_structure where
31  *              ever possible.
32  */
33
34 #include <linux/config.h>
35 #include <linux/version.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  kdevname(tty->device), (info->flags), serial_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 #ifdef MODVERSIONS
63 #include <linux/modversions.h>
64 #endif
65 #include <linux/module.h>
66
67 #include <linux/types.h>
68 #include <linux/serial.h>
69 #include <linux/serialP.h>
70 #include <linux/serial_reg.h>
71 static char *serial_version = "4.30";
72
73 #include <linux/errno.h>
74 #include <linux/signal.h>
75 #include <linux/sched.h>
76 #include <linux/kernel.h>
77 #include <linux/timer.h>
78 #include <linux/interrupt.h>
79 #include <linux/tty.h>
80 #include <linux/tty_flip.h>
81 #include <linux/console.h>
82 #include <linux/major.h>
83 #include <linux/string.h>
84 #include <linux/fcntl.h>
85 #include <linux/ptrace.h>
86 #include <linux/ioport.h>
87 #include <linux/mm.h>
88 #include <linux/slab.h>
89 #include <linux/init.h>
90 #include <linux/delay.h>
91
92 #include <asm/setup.h>
93
94 #include <asm/system.h>
95 #include <asm/io.h>
96 #include <asm/irq.h>
97 #include <asm/bitops.h>
98
99 #include <asm/amigahw.h>
100 #include <asm/amigaints.h>
101
102 #ifdef SERIAL_INLINE
103 #define _INLINE_ inline
104 #endif
105
106 static char *serial_name = "Amiga-builtin serial driver";
107
108 static DECLARE_TASK_QUEUE(tq_serial);
109
110 static struct tty_driver serial_driver, callout_driver;
111 static int serial_refcount;
112
113 /* serial subtype definitions */
114 #ifndef SERIAL_TYPE_NORMAL
115 #define SERIAL_TYPE_NORMAL      1
116 #define SERIAL_TYPE_CALLOUT     2
117 #endif
118
119 /* number of characters left in xmit buffer before we ask for more */
120 #define WAKEUP_CHARS 256
121
122 static struct async_struct *IRQ_ports;
123
124 static unsigned char current_ctl_bits;
125
126 static void change_speed(struct async_struct *info, struct termios *old);
127 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
128
129
130 static struct serial_state rs_table[1];
131
132 #define NR_PORTS        (sizeof(rs_table)/sizeof(struct serial_state))
133
134
135 static struct tty_struct *serial_table[NR_PORTS];
136 static struct termios *serial_termios[NR_PORTS];
137 static struct termios *serial_termios_locked[NR_PORTS];
138
139 #ifndef MIN
140 #define MIN(a,b)        ((a) < (b) ? (a) : (b))
141 #endif
142
143 /*
144  * tmp_buf is used as a temporary buffer by serial_write.  We need to
145  * lock it in case the copy_from_user blocks while swapping in a page,
146  * and some other program tries to do a serial write at the same time.
147  * Since the lock will only come under contention when the system is
148  * swapping and available memory is low, it makes sense to share one
149  * buffer across all the serial ports, since it significantly saves
150  * memory if large numbers of serial ports are open.
151  */
152 static unsigned char *tmp_buf;
153 static DECLARE_MUTEX(tmp_buf_sem);
154
155 #include <asm/uaccess.h>
156
157 #define serial_isroot() (capable(CAP_SYS_ADMIN))
158
159
160 static inline int serial_paranoia_check(struct async_struct *info,
161                                         kdev_t device, const char *routine)
162 {
163 #ifdef SERIAL_PARANOIA_CHECK
164         static const char *badmagic =
165                 "Warning: bad magic number for serial struct (%s) in %s\n";
166         static const char *badinfo =
167                 "Warning: null async_struct for (%s) in %s\n";
168
169         if (!info) {
170                 printk(badinfo, kdevname(device), routine);
171                 return 1;
172         }
173         if (info->magic != SERIAL_MAGIC) {
174                 printk(badmagic, kdevname(device), routine);
175                 return 1;
176         }
177 #endif
178         return 0;
179 }
180
181 /* some serial hardware definitions */
182 #define SDR_OVRUN   (1<<15)
183 #define SDR_RBF     (1<<14)
184 #define SDR_TBE     (1<<13)
185 #define SDR_TSRE    (1<<12)
186
187 #define SERPER_PARENB    (1<<15)
188
189 #define AC_SETCLR   (1<<15)
190 #define AC_UARTBRK  (1<<11)
191
192 #define SER_DTR     (1<<7)
193 #define SER_RTS     (1<<6)
194 #define SER_DCD     (1<<5)
195 #define SER_CTS     (1<<4)
196 #define SER_DSR     (1<<3)
197
198 static __inline__ void rtsdtr_ctrl(int bits)
199 {
200     ciab.pra = ((bits & (SER_RTS | SER_DTR)) ^ (SER_RTS | SER_DTR)) | (ciab.pra & ~(SER_RTS | SER_DTR));
201 }
202
203 /*
204  * ------------------------------------------------------------
205  * rs_stop() and rs_start()
206  *
207  * This routines are called before setting or resetting tty->stopped.
208  * They enable or disable transmitter interrupts, as necessary.
209  * ------------------------------------------------------------
210  */
211 static void rs_stop(struct tty_struct *tty)
212 {
213         struct async_struct *info = (struct async_struct *)tty->driver_data;
214         unsigned long flags;
215
216         if (serial_paranoia_check(info, tty->device, "rs_stop"))
217                 return;
218
219         save_flags(flags); cli();
220         if (info->IER & UART_IER_THRI) {
221                 info->IER &= ~UART_IER_THRI;
222                 /* disable Tx interrupt and remove any pending interrupts */
223                 custom.intena = IF_TBE;
224                 mb();
225                 custom.intreq = IF_TBE;
226                 mb();
227         }
228         restore_flags(flags);
229 }
230
231 static void rs_start(struct tty_struct *tty)
232 {
233         struct async_struct *info = (struct async_struct *)tty->driver_data;
234         unsigned long flags;
235
236         if (serial_paranoia_check(info, tty->device, "rs_start"))
237                 return;
238
239         save_flags(flags); cli();
240         if (info->xmit.head != info->xmit.tail
241             && info->xmit.buf
242             && !(info->IER & UART_IER_THRI)) {
243                 info->IER |= UART_IER_THRI;
244                 custom.intena = IF_SETCLR | IF_TBE;
245                 mb();
246                 /* set a pending Tx Interrupt, transmitter should restart now */
247                 custom.intreq = IF_SETCLR | IF_TBE;
248                 mb();
249         }
250         restore_flags(flags);
251 }
252
253 /*
254  * ----------------------------------------------------------------------
255  *
256  * Here starts the interrupt handling routines.  All of the following
257  * subroutines are declared as inline and are folded into
258  * rs_interrupt().  They were separated out for readability's sake.
259  *
260  * Note: rs_interrupt() is a "fast" interrupt, which means that it
261  * runs with interrupts turned off.  People who may want to modify
262  * rs_interrupt() should try to keep the interrupt handler as fast as
263  * possible.  After you are done making modifications, it is not a bad
264  * idea to do:
265  * 
266  * gcc -S -DKERNEL -Wall -Wstrict-prototypes -O6 -fomit-frame-pointer serial.c
267  *
268  * and look at the resulting assemble code in serial.s.
269  *
270  *                              - Ted Ts'o (tytso@mit.edu), 7-Mar-93
271  * -----------------------------------------------------------------------
272  */
273
274 /*
275  * This routine is used by the interrupt handler to schedule
276  * processing in the software interrupt portion of the driver.
277  */
278 static _INLINE_ void rs_sched_event(struct async_struct *info,
279                                   int event)
280 {
281         info->event |= 1 << event;
282         queue_task(&info->tqueue, &tq_serial);
283         mark_bh(SERIAL_BH);
284 }
285
286 static _INLINE_ void receive_chars(struct async_struct *info)
287 {
288         int status;
289         int serdatr;
290         struct tty_struct *tty = info->tty;
291         unsigned char ch;
292         struct  async_icount *icount;
293
294         icount = &info->state->icount;
295
296         status = UART_LSR_DR; /* We obviously have a character! */
297         serdatr = custom.serdatr;
298         mb();
299         custom.intreq = IF_RBF;
300         mb();
301
302         if((serdatr & 0x1ff) == 0)
303             status |= UART_LSR_BI;
304         if(serdatr & SDR_OVRUN)
305             status |= UART_LSR_OE;
306
307         ch = serdatr & 0xff;
308         if (tty->flip.count >= TTY_FLIPBUF_SIZE)
309           goto ignore_char;
310         *tty->flip.char_buf_ptr = ch;
311         icount->rx++;
312
313 #ifdef SERIAL_DEBUG_INTR
314         printk("DR%02x:%02x...", ch, status);
315 #endif
316         *tty->flip.flag_buf_ptr = 0;
317
318         /*
319          * We don't handle parity or frame errors - but I have left
320          * the code in, since I'm not sure that the errors can't be
321          * detected.
322          */
323
324         if (status & (UART_LSR_BI | UART_LSR_PE |
325                       UART_LSR_FE | UART_LSR_OE)) {
326           /*
327            * For statistics only
328            */
329           if (status & UART_LSR_BI) {
330             status &= ~(UART_LSR_FE | UART_LSR_PE);
331             icount->brk++;
332           } else if (status & UART_LSR_PE)
333             icount->parity++;
334           else if (status & UART_LSR_FE)
335             icount->frame++;
336           if (status & UART_LSR_OE)
337             icount->overrun++;
338
339           /*
340            * Now check to see if character should be
341            * ignored, and mask off conditions which
342            * should be ignored.
343            */
344           if (status & info->ignore_status_mask)
345             goto ignore_char;
346
347           status &= info->read_status_mask;
348
349           if (status & (UART_LSR_BI)) {
350 #ifdef SERIAL_DEBUG_INTR
351             printk("handling break....");
352 #endif
353             *tty->flip.flag_buf_ptr = TTY_BREAK;
354             if (info->flags & ASYNC_SAK)
355               do_SAK(tty);
356           } else if (status & UART_LSR_PE)
357             *tty->flip.flag_buf_ptr = TTY_PARITY;
358           else if (status & UART_LSR_FE)
359             *tty->flip.flag_buf_ptr = TTY_FRAME;
360           if (status & UART_LSR_OE) {
361             /*
362              * Overrun is special, since it's
363              * reported immediately, and doesn't
364              * affect the current character
365              */
366             if (tty->flip.count < TTY_FLIPBUF_SIZE) {
367               tty->flip.count++;
368               tty->flip.flag_buf_ptr++;
369               tty->flip.char_buf_ptr++;
370               *tty->flip.flag_buf_ptr = TTY_OVERRUN;
371             }
372           }
373         }
374         tty->flip.flag_buf_ptr++;
375         tty->flip.char_buf_ptr++;
376         tty->flip.count++;
377  ignore_char:
378
379         tty_flip_buffer_push(tty);
380 }
381
382 static _INLINE_ void transmit_chars(struct async_struct *info)
383 {
384         custom.intreq = IF_TBE;
385         mb();
386         if (info->x_char) {
387                 custom.serdat = info->x_char | 0x100;
388                 mb();
389                 info->state->icount.tx++;
390                 info->x_char = 0;
391                 return;
392         }
393         if (info->xmit.head == info->xmit.tail
394             || info->tty->stopped
395             || info->tty->hw_stopped) {
396                 info->IER &= ~UART_IER_THRI;
397                 custom.intena = IF_TBE;
398                 mb();
399                 return;
400         }
401
402         custom.serdat = info->xmit.buf[info->xmit.tail++] | 0x100;
403         mb();
404         info->xmit.tail = info->xmit.tail & (SERIAL_XMIT_SIZE-1);
405         info->state->icount.tx++;
406
407         if (CIRC_CNT(info->xmit.head,
408                      info->xmit.tail,
409                      SERIAL_XMIT_SIZE) < WAKEUP_CHARS)
410                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
411
412 #ifdef SERIAL_DEBUG_INTR
413         printk("THRE...");
414 #endif
415         if (info->xmit.head == info->xmit.tail) {
416                 custom.intena = IF_TBE;
417                 mb();
418                 info->IER &= ~UART_IER_THRI;
419         }
420 }
421
422 static _INLINE_ void check_modem_status(struct async_struct *info)
423 {
424         unsigned char status = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
425         unsigned char dstatus;
426         struct  async_icount *icount;
427
428         /* Determine bits that have changed */
429         dstatus = status ^ current_ctl_bits;
430         current_ctl_bits = status;
431
432         if (dstatus) {
433                 icount = &info->state->icount;
434                 /* update input line counters */
435                 if (dstatus & SER_DSR)
436                         icount->dsr++;
437                 if (dstatus & SER_DCD) {
438                         icount->dcd++;
439 #ifdef CONFIG_HARD_PPS
440                         if ((info->flags & ASYNC_HARDPPS_CD) &&
441                             !(status & SER_DCD))
442                                 hardpps();
443 #endif
444                 }
445                 if (dstatus & SER_CTS)
446                         icount->cts++;
447                 wake_up_interruptible(&info->delta_msr_wait);
448         }
449
450         if ((info->flags & ASYNC_CHECK_CD) && (dstatus & SER_DCD)) {
451 #if (defined(SERIAL_DEBUG_OPEN) || defined(SERIAL_DEBUG_INTR))
452                 printk("ttyS%02d CD now %s...", info->line,
453                        (!(status & SER_DCD)) ? "on" : "off");
454 #endif
455                 if (!(status & SER_DCD))
456                         wake_up_interruptible(&info->open_wait);
457                 else if (!((info->flags & ASYNC_CALLOUT_ACTIVE) &&
458                            (info->flags & ASYNC_CALLOUT_NOHUP))) {
459 #ifdef SERIAL_DEBUG_OPEN
460                         printk("doing serial hangup...");
461 #endif
462                         if (info->tty)
463                                 tty_hangup(info->tty);
464                 }
465         }
466         if (info->flags & ASYNC_CTS_FLOW) {
467                 if (info->tty->hw_stopped) {
468                         if (!(status & SER_CTS)) {
469 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
470                                 printk("CTS tx start...");
471 #endif
472                                 info->tty->hw_stopped = 0;
473                                 info->IER |= UART_IER_THRI;
474                                 custom.intena = IF_SETCLR | IF_TBE;
475                                 mb();
476                                 /* set a pending Tx Interrupt, transmitter should restart now */
477                                 custom.intreq = IF_SETCLR | IF_TBE;
478                                 mb();
479                                 rs_sched_event(info, RS_EVENT_WRITE_WAKEUP);
480                                 return;
481                         }
482                 } else {
483                         if ((status & SER_CTS)) {
484 #if (defined(SERIAL_DEBUG_INTR) || defined(SERIAL_DEBUG_FLOW))
485                                 printk("CTS tx stop...");
486 #endif
487                                 info->tty->hw_stopped = 1;
488                                 info->IER &= ~UART_IER_THRI;
489                                 /* disable Tx interrupt and remove any pending interrupts */
490                                 custom.intena = IF_TBE;
491                                 mb();
492                                 custom.intreq = IF_TBE;
493                                 mb();
494                         }
495                 }
496         }
497 }
498
499 static void ser_vbl_int( int irq, void *data, struct pt_regs *regs)
500 {
501         /* vbl is just a periodic interrupt we tie into to update modem status */
502         struct async_struct * info = IRQ_ports;
503         /*
504          * TBD - is it better to unregister from this interrupt or to
505          * ignore it if MSI is clear ?
506          */
507         if(info->IER & UART_IER_MSI)
508           check_modem_status(info);
509 }
510
511 static void ser_rx_int(int irq, void *dev_id, struct pt_regs * regs)
512 {
513         struct async_struct * info;
514
515 #ifdef SERIAL_DEBUG_INTR
516         printk("ser_rx_int...");
517 #endif
518
519         info = IRQ_ports;
520         if (!info || !info->tty)
521                 return;
522
523         receive_chars(info);
524         info->last_active = jiffies;
525 #ifdef SERIAL_DEBUG_INTR
526         printk("end.\n");
527 #endif
528 }
529
530 static void ser_tx_int(int irq, void *dev_id, struct pt_regs * regs)
531 {
532         struct async_struct * info;
533
534         if (custom.serdatr & SDR_TBE) {
535 #ifdef SERIAL_DEBUG_INTR
536           printk("ser_tx_int...");
537 #endif
538
539           info = IRQ_ports;
540           if (!info || !info->tty)
541             return;
542
543           transmit_chars(info);
544           info->last_active = jiffies;
545 #ifdef SERIAL_DEBUG_INTR
546           printk("end.\n");
547 #endif
548         }
549 }
550
551 /*
552  * -------------------------------------------------------------------
553  * Here ends the serial interrupt routines.
554  * -------------------------------------------------------------------
555  */
556
557 /*
558  * This routine is used to handle the "bottom half" processing for the
559  * serial driver, known also the "software interrupt" processing.
560  * This processing is done at the kernel interrupt level, after the
561  * rs_interrupt() has returned, BUT WITH INTERRUPTS TURNED ON.  This
562  * is where time-consuming activities which can not be done in the
563  * interrupt driver proper are done; the interrupt driver schedules
564  * them using rs_sched_event(), and they get done here.
565  */
566 static void do_serial_bh(void)
567 {
568         run_task_queue(&tq_serial);
569 }
570
571 static void do_softint(void *private_)
572 {
573         struct async_struct     *info = (struct async_struct *) private_;
574         struct tty_struct       *tty;
575
576         tty = info->tty;
577         if (!tty)
578                 return;
579
580         if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
581                 if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
582                     tty->ldisc.write_wakeup)
583                         (tty->ldisc.write_wakeup)(tty);
584                 wake_up_interruptible(&tty->write_wait);
585         }
586 }
587
588 /*
589  * ---------------------------------------------------------------
590  * Low level utility subroutines for the serial driver:  routines to
591  * figure out the appropriate timeout for an interrupt chain, routines
592  * to initialize and startup a serial port, and routines to shutdown a
593  * serial port.  Useful stuff like that.
594  * ---------------------------------------------------------------
595  */
596
597 static int startup(struct async_struct * info)
598 {
599         unsigned long flags;
600         int     retval=0;
601         unsigned long page;
602
603         page = get_free_page(GFP_KERNEL);
604         if (!page)
605                 return -ENOMEM;
606
607         save_flags(flags); cli();
608
609         if (info->flags & ASYNC_INITIALIZED) {
610                 free_page(page);
611                 goto errout;
612         }
613
614         if (info->xmit.buf)
615                 free_page(page);
616         else
617                 info->xmit.buf = (unsigned char *) page;
618
619 #ifdef SERIAL_DEBUG_OPEN
620         printk("starting up ttys%d ...", info->line);
621 #endif
622
623         /* Clear anything in the input buffer */
624
625         custom.intreq = IF_RBF;
626         mb();
627
628         retval = request_irq(IRQ_AMIGA_VERTB, ser_vbl_int, 0, "serial status", info);
629         if (retval) {
630           if (serial_isroot()) {
631             if (info->tty)
632               set_bit(TTY_IO_ERROR,
633                       &info->tty->flags);
634             retval = 0;
635           }
636           goto errout;
637         }
638
639         /* enable both Rx and Tx interrupts */
640         custom.intena = IF_SETCLR | IF_RBF | IF_TBE;
641         mb();
642         info->IER = UART_IER_MSI;
643
644         /* remember current state of the DCD and CTS bits */
645         current_ctl_bits = ciab.pra & (SER_DCD | SER_CTS | SER_DSR);
646
647         IRQ_ports = info;
648
649         info->MCR = 0;
650         if (info->tty->termios->c_cflag & CBAUD)
651           info->MCR = SER_DTR | SER_RTS;
652         rtsdtr_ctrl(info->MCR);
653
654         if (info->tty)
655                 clear_bit(TTY_IO_ERROR, &info->tty->flags);
656         info->xmit.head = info->xmit.tail = 0;
657
658         /*
659          * Set up the tty->alt_speed kludge
660          */
661         if (info->tty) {
662                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
663                         info->tty->alt_speed = 57600;
664                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
665                         info->tty->alt_speed = 115200;
666                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
667                         info->tty->alt_speed = 230400;
668                 if ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
669                         info->tty->alt_speed = 460800;
670         }
671
672         /*
673          * and set the speed of the serial port
674          */
675         change_speed(info, 0);
676
677         info->flags |= ASYNC_INITIALIZED;
678         restore_flags(flags);
679         return 0;
680
681 errout:
682         restore_flags(flags);
683         return retval;
684 }
685
686 /*
687  * This routine will shutdown a serial port; interrupts are disabled, and
688  * DTR is dropped if the hangup on close termio flag is on.
689  */
690 static void shutdown(struct async_struct * info)
691 {
692         unsigned long   flags;
693         struct serial_state *state;
694
695         if (!(info->flags & ASYNC_INITIALIZED))
696                 return;
697
698         state = info->state;
699
700 #ifdef SERIAL_DEBUG_OPEN
701         printk("Shutting down serial port %d ....\n", info->line);
702 #endif
703
704         save_flags(flags); cli(); /* Disable interrupts */
705
706         /*
707          * clear delta_msr_wait queue to avoid mem leaks: we may free the irq
708          * here so the queue might never be waken up
709          */
710         wake_up_interruptible(&info->delta_msr_wait);
711
712         IRQ_ports = NULL;
713
714         /*
715          * Free the IRQ, if necessary
716          */
717         free_irq(IRQ_AMIGA_VERTB, info);
718
719         if (info->xmit.buf) {
720                 free_page((unsigned long) info->xmit.buf);
721                 info->xmit.buf = 0;
722         }
723
724         info->IER = 0;
725         custom.intena = IF_RBF | IF_TBE;
726         mb();
727
728         /* disable break condition */
729         custom.adkcon = AC_UARTBRK;
730         mb();
731
732         if (!info->tty || (info->tty->termios->c_cflag & HUPCL))
733                 info->MCR &= ~(SER_DTR|SER_RTS);
734         rtsdtr_ctrl(info->MCR);
735
736         if (info->tty)
737                 set_bit(TTY_IO_ERROR, &info->tty->flags);
738
739         info->flags &= ~ASYNC_INITIALIZED;
740         restore_flags(flags);
741 }
742
743
744 /*
745  * This routine is called to set the UART divisor registers to match
746  * the specified baud rate for a serial port.
747  */
748 static void change_speed(struct async_struct *info,
749                          struct termios *old_termios)
750 {
751         int     quot = 0, baud_base, baud;
752         unsigned cflag, cval = 0;
753         int     bits;
754         unsigned long   flags;
755
756         if (!info->tty || !info->tty->termios)
757                 return;
758         cflag = info->tty->termios->c_cflag;
759
760         /* Byte size is always 8 bits plus parity bit if requested */
761
762         cval = 3; bits = 10;
763         if (cflag & CSTOPB) {
764                 cval |= 0x04;
765                 bits++;
766         }
767         if (cflag & PARENB) {
768                 cval |= UART_LCR_PARITY;
769                 bits++;
770         }
771         if (!(cflag & PARODD))
772                 cval |= UART_LCR_EPAR;
773 #ifdef CMSPAR
774         if (cflag & CMSPAR)
775                 cval |= UART_LCR_SPAR;
776 #endif
777
778         /* Determine divisor based on baud rate */
779         baud = tty_get_baud_rate(info->tty);
780         if (!baud)
781                 baud = 9600;    /* B0 transition handled in rs_set_termios */
782         baud_base = info->state->baud_base;
783         if (baud == 38400 &&
784             ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
785                 quot = info->state->custom_divisor;
786         else {
787                 if (baud == 134)
788                         /* Special case since 134 is really 134.5 */
789                         quot = (2*baud_base / 269);
790                 else if (baud)
791                         quot = baud_base / baud;
792         }
793         /* If the quotient is zero refuse the change */
794         if (!quot && old_termios) {
795                 info->tty->termios->c_cflag &= ~CBAUD;
796                 info->tty->termios->c_cflag |= (old_termios->c_cflag & CBAUD);
797                 baud = tty_get_baud_rate(info->tty);
798                 if (!baud)
799                         baud = 9600;
800                 if (baud == 38400 &&
801                     ((info->flags & ASYNC_SPD_MASK) == ASYNC_SPD_CUST))
802                         quot = info->state->custom_divisor;
803                 else {
804                         if (baud == 134)
805                                 /* Special case since 134 is really 134.5 */
806                                 quot = (2*baud_base / 269);
807                         else if (baud)
808                                 quot = baud_base / baud;
809                 }
810         }
811         /* As a last resort, if the quotient is zero, default to 9600 bps */
812         if (!quot)
813                 quot = baud_base / 9600;
814         info->quot = quot;
815         info->timeout = ((info->xmit_fifo_size*HZ*bits*quot) / baud_base);
816         info->timeout += HZ/50;         /* Add .02 seconds of slop */
817
818         /* CTS flow control flag and modem status interrupts */
819         info->IER &= ~UART_IER_MSI;
820         if (info->flags & ASYNC_HARDPPS_CD)
821                 info->IER |= UART_IER_MSI;
822         if (cflag & CRTSCTS) {
823                 info->flags |= ASYNC_CTS_FLOW;
824                 info->IER |= UART_IER_MSI;
825         } else
826                 info->flags &= ~ASYNC_CTS_FLOW;
827         if (cflag & CLOCAL)
828                 info->flags &= ~ASYNC_CHECK_CD;
829         else {
830                 info->flags |= ASYNC_CHECK_CD;
831                 info->IER |= UART_IER_MSI;
832         }
833         /* TBD:
834          * Does clearing IER_MSI imply that we should disbale the VBL interrupt ?
835          */
836
837         /*
838          * Set up parity check flag
839          */
840 #define RELEVANT_IFLAG(iflag) (iflag & (IGNBRK|BRKINT|IGNPAR|PARMRK|INPCK))
841
842         info->read_status_mask = UART_LSR_OE | UART_LSR_DR;
843         if (I_INPCK(info->tty))
844                 info->read_status_mask |= UART_LSR_FE | UART_LSR_PE;
845         if (I_BRKINT(info->tty) || I_PARMRK(info->tty))
846                 info->read_status_mask |= UART_LSR_BI;
847
848         /*
849          * Characters to ignore
850          */
851         info->ignore_status_mask = 0;
852         if (I_IGNPAR(info->tty))
853                 info->ignore_status_mask |= UART_LSR_PE | UART_LSR_FE;
854         if (I_IGNBRK(info->tty)) {
855                 info->ignore_status_mask |= UART_LSR_BI;
856                 /*
857                  * If we're ignore parity and break indicators, ignore 
858                  * overruns too.  (For real raw support).
859                  */
860                 if (I_IGNPAR(info->tty))
861                         info->ignore_status_mask |= UART_LSR_OE;
862         }
863         /*
864          * !!! ignore all characters if CREAD is not set
865          */
866         if ((cflag & CREAD) == 0)
867                 info->ignore_status_mask |= UART_LSR_DR;
868         save_flags(flags); cli();
869
870         {
871           short serper;
872
873         /* Set up the baud rate */
874           serper = quot - 1;
875
876         /* Enable or disable parity bit */
877
878         if(cval & UART_LCR_PARITY)
879           serper |= (SERPER_PARENB);
880
881         custom.serper = serper;
882         mb();
883         }
884
885         info->LCR = cval;                               /* Save LCR */
886         restore_flags(flags);
887 }
888
889 static void rs_put_char(struct tty_struct *tty, unsigned char ch)
890 {
891         struct async_struct *info = (struct async_struct *)tty->driver_data;
892         unsigned long flags;
893
894         if (serial_paranoia_check(info, tty->device, "rs_put_char"))
895                 return;
896
897         if (!tty || !info->xmit.buf)
898                 return;
899
900         save_flags(flags); cli();
901         if (CIRC_SPACE(info->xmit.head,
902                        info->xmit.tail,
903                        SERIAL_XMIT_SIZE) == 0) {
904                 restore_flags(flags);
905                 return;
906         }
907
908         info->xmit.buf[info->xmit.head++] = ch;
909         info->xmit.head &= SERIAL_XMIT_SIZE-1;
910         restore_flags(flags);
911 }
912
913 static void rs_flush_chars(struct tty_struct *tty)
914 {
915         struct async_struct *info = (struct async_struct *)tty->driver_data;
916         unsigned long flags;
917
918         if (serial_paranoia_check(info, tty->device, "rs_flush_chars"))
919                 return;
920
921         if (info->xmit.head == info->xmit.tail
922             || tty->stopped
923             || tty->hw_stopped
924             || !info->xmit.buf)
925                 return;
926
927         save_flags(flags); cli();
928         info->IER |= UART_IER_THRI;
929         custom.intena = IF_SETCLR | IF_TBE;
930         mb();
931         /* set a pending Tx Interrupt, transmitter should restart now */
932         custom.intreq = IF_SETCLR | IF_TBE;
933         mb();
934         restore_flags(flags);
935 }
936
937 static int rs_write(struct tty_struct * tty, int from_user,
938                     const unsigned char *buf, int count)
939 {
940         int     c, ret = 0;
941         struct async_struct *info = (struct async_struct *)tty->driver_data;
942         unsigned long flags;
943
944         if (serial_paranoia_check(info, tty->device, "rs_write"))
945                 return 0;
946
947         if (!tty || !info->xmit.buf || !tmp_buf)
948                 return 0;
949
950         save_flags(flags);
951         if (from_user) {
952                 down(&tmp_buf_sem);
953                 while (1) {
954                         int c1;
955                         c = CIRC_SPACE_TO_END(info->xmit.head,
956                                               info->xmit.tail,
957                                               SERIAL_XMIT_SIZE);
958                         if (count < c)
959                                 c = count;
960
961                         c -= copy_from_user(tmp_buf, buf, c);
962                         if (!c) {
963                                 if (!ret)
964                                         ret = -EFAULT;
965                                 break;
966                         }
967                         cli();
968                         c1 = CIRC_SPACE_TO_END(info->xmit.head,
969                                                info->xmit.tail,
970                                                SERIAL_XMIT_SIZE);
971                         if (c1 < c)
972                                 c = c1;
973                         memcpy(info->xmit.buf + info->xmit.head, tmp_buf, c);
974                         info->xmit.head = ((info->xmit.head + c) &
975                                            (SERIAL_XMIT_SIZE-1));
976                         restore_flags(flags);
977                         buf += c;
978                         count -= c;
979                         ret += c;
980                 }
981                 up(&tmp_buf_sem);
982         } else {
983                 cli();
984                 while (1) {
985                         c = CIRC_SPACE_TO_END(info->xmit.head,
986                                               info->xmit.tail,
987                                               SERIAL_XMIT_SIZE);
988                         if (count < c)
989                                 c = count;
990                         if (c <= 0) {
991                                 break;
992                         }
993                         memcpy(info->xmit.buf + info->xmit.head, buf, c);
994                         info->xmit.head = ((info->xmit.head + c) &
995                                            (SERIAL_XMIT_SIZE-1));
996                         buf += c;
997                         count -= c;
998                         ret += c;
999                 }
1000                 restore_flags(flags);
1001         }
1002         if (info->xmit.head != info->xmit.tail
1003             && !tty->stopped
1004             && !tty->hw_stopped
1005             && !(info->IER & UART_IER_THRI)) {
1006                 info->IER |= UART_IER_THRI;
1007                 cli();
1008                 custom.intena = IF_SETCLR | IF_TBE;
1009                 mb();
1010                 /* set a pending Tx Interrupt, transmitter should restart now */
1011                 custom.intreq = IF_SETCLR | IF_TBE;
1012                 mb();
1013                 restore_flags(flags);
1014         }
1015         return ret;
1016 }
1017
1018 static int rs_write_room(struct tty_struct *tty)
1019 {
1020         struct async_struct *info = (struct async_struct *)tty->driver_data;
1021
1022         if (serial_paranoia_check(info, tty->device, "rs_write_room"))
1023                 return 0;
1024         return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
1025 }
1026
1027 static int rs_chars_in_buffer(struct tty_struct *tty)
1028 {
1029         struct async_struct *info = (struct async_struct *)tty->driver_data;
1030
1031         if (serial_paranoia_check(info, tty->device, "rs_chars_in_buffer"))
1032                 return 0;
1033         return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
1034 }
1035
1036 static void rs_flush_buffer(struct tty_struct *tty)
1037 {
1038         struct async_struct *info = (struct async_struct *)tty->driver_data;
1039         unsigned long flags;
1040
1041         if (serial_paranoia_check(info, tty->device, "rs_flush_buffer"))
1042                 return;
1043         save_flags(flags); cli();
1044         info->xmit.head = info->xmit.tail = 0;
1045         restore_flags(flags);
1046         wake_up_interruptible(&tty->write_wait);
1047         if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
1048             tty->ldisc.write_wakeup)
1049                 (tty->ldisc.write_wakeup)(tty);
1050 }
1051
1052 /*
1053  * This function is used to send a high-priority XON/XOFF character to
1054  * the device
1055  */
1056 static void rs_send_xchar(struct tty_struct *tty, char ch)
1057 {
1058         struct async_struct *info = (struct async_struct *)tty->driver_data;
1059         unsigned long flags;
1060
1061         if (serial_paranoia_check(info, tty->device, "rs_send_char"))
1062                 return;
1063
1064         info->x_char = ch;
1065         if (ch) {
1066                 /* Make sure transmit interrupts are on */
1067
1068                 /* Check this ! */
1069                 save_flags(flags);
1070                 cli();
1071                 if(!(custom.intenar & IF_TBE)) {
1072                     custom.intena = IF_SETCLR | IF_TBE;
1073                     mb();
1074                     /* set a pending Tx Interrupt, transmitter should restart now */
1075                     custom.intreq = IF_SETCLR | IF_TBE;
1076                     mb();
1077                 }
1078                 restore_flags(flags);
1079
1080                 info->IER |= UART_IER_THRI;
1081         }
1082 }
1083
1084 /*
1085  * ------------------------------------------------------------
1086  * rs_throttle()
1087  * 
1088  * This routine is called by the upper-layer tty layer to signal that
1089  * incoming characters should be throttled.
1090  * ------------------------------------------------------------
1091  */
1092 static void rs_throttle(struct tty_struct * tty)
1093 {
1094         struct async_struct *info = (struct async_struct *)tty->driver_data;
1095         unsigned long flags;
1096 #ifdef SERIAL_DEBUG_THROTTLE
1097         char    buf[64];
1098
1099         printk("throttle %s: %d....\n", tty_name(tty, buf),
1100                tty->ldisc.chars_in_buffer(tty));
1101 #endif
1102
1103         if (serial_paranoia_check(info, tty->device, "rs_throttle"))
1104                 return;
1105
1106         if (I_IXOFF(tty))
1107                 rs_send_xchar(tty, STOP_CHAR(tty));
1108
1109         if (tty->termios->c_cflag & CRTSCTS)
1110                 info->MCR &= ~SER_RTS;
1111
1112         save_flags(flags); cli();
1113         rtsdtr_ctrl(info->MCR);
1114         restore_flags(flags);
1115 }
1116
1117 static void rs_unthrottle(struct tty_struct * tty)
1118 {
1119         struct async_struct *info = (struct async_struct *)tty->driver_data;
1120         unsigned long flags;
1121 #ifdef SERIAL_DEBUG_THROTTLE
1122         char    buf[64];
1123
1124         printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1125                tty->ldisc.chars_in_buffer(tty));
1126 #endif
1127
1128         if (serial_paranoia_check(info, tty->device, "rs_unthrottle"))
1129                 return;
1130
1131         if (I_IXOFF(tty)) {
1132                 if (info->x_char)
1133                         info->x_char = 0;
1134                 else
1135                         rs_send_xchar(tty, START_CHAR(tty));
1136         }
1137         if (tty->termios->c_cflag & CRTSCTS)
1138                 info->MCR |= SER_RTS;
1139         save_flags(flags); cli();
1140         rtsdtr_ctrl(info->MCR);
1141         restore_flags(flags);
1142 }
1143
1144 /*
1145  * ------------------------------------------------------------
1146  * rs_ioctl() and friends
1147  * ------------------------------------------------------------
1148  */
1149
1150 static int get_serial_info(struct async_struct * info,
1151                            struct serial_struct * retinfo)
1152 {
1153         struct serial_struct tmp;
1154         struct serial_state *state = info->state;
1155    
1156         if (!retinfo)
1157                 return -EFAULT;
1158         memset(&tmp, 0, sizeof(tmp));
1159         tmp.type = state->type;
1160         tmp.line = state->line;
1161         tmp.port = state->port;
1162         tmp.irq = state->irq;
1163         tmp.flags = state->flags;
1164         tmp.xmit_fifo_size = state->xmit_fifo_size;
1165         tmp.baud_base = state->baud_base;
1166         tmp.close_delay = state->close_delay;
1167         tmp.closing_wait = state->closing_wait;
1168         tmp.custom_divisor = state->custom_divisor;
1169         if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1170                 return -EFAULT;
1171         return 0;
1172 }
1173
1174 static int set_serial_info(struct async_struct * info,
1175                            struct serial_struct * new_info)
1176 {
1177         struct serial_struct new_serial;
1178         struct serial_state old_state, *state;
1179         unsigned int            change_irq,change_port;
1180         int                     retval = 0;
1181
1182         if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1183                 return -EFAULT;
1184         state = info->state;
1185         old_state = *state;
1186   
1187         change_irq = new_serial.irq != state->irq;
1188         change_port = (new_serial.port != state->port);
1189         if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size))
1190           return -EINVAL;
1191   
1192         if (!serial_isroot()) {
1193                 if ((new_serial.baud_base != state->baud_base) ||
1194                     (new_serial.close_delay != state->close_delay) ||
1195                     (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1196                     ((new_serial.flags & ~ASYNC_USR_MASK) !=
1197                      (state->flags & ~ASYNC_USR_MASK)))
1198                         return -EPERM;
1199                 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1200                                (new_serial.flags & ASYNC_USR_MASK));
1201                 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1202                                (new_serial.flags & ASYNC_USR_MASK));
1203                 state->custom_divisor = new_serial.custom_divisor;
1204                 goto check_and_exit;
1205         }
1206
1207         if (new_serial.baud_base < 9600)
1208                 return -EINVAL;
1209
1210         /*
1211          * OK, past this point, all the error checking has been done.
1212          * At this point, we start making changes.....
1213          */
1214
1215         state->baud_base = new_serial.baud_base;
1216         state->flags = ((state->flags & ~ASYNC_FLAGS) |
1217                         (new_serial.flags & ASYNC_FLAGS));
1218         info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1219                        (info->flags & ASYNC_INTERNAL_FLAGS));
1220         state->custom_divisor = new_serial.custom_divisor;
1221         state->close_delay = new_serial.close_delay * HZ/100;
1222         state->closing_wait = new_serial.closing_wait * HZ/100;
1223         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1224
1225 check_and_exit:
1226         if (info->flags & ASYNC_INITIALIZED) {
1227                 if (((old_state.flags & ASYNC_SPD_MASK) !=
1228                      (state->flags & ASYNC_SPD_MASK)) ||
1229                     (old_state.custom_divisor != state->custom_divisor)) {
1230                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1231                                 info->tty->alt_speed = 57600;
1232                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1233                                 info->tty->alt_speed = 115200;
1234                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1235                                 info->tty->alt_speed = 230400;
1236                         if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1237                                 info->tty->alt_speed = 460800;
1238                         change_speed(info, 0);
1239                 }
1240         } else
1241                 retval = startup(info);
1242         return retval;
1243 }
1244
1245
1246 /*
1247  * get_lsr_info - get line status register info
1248  *
1249  * Purpose: Let user call ioctl() to get info when the UART physically
1250  *          is emptied.  On bus types like RS485, the transmitter must
1251  *          release the bus after transmitting. This must be done when
1252  *          the transmit shift register is empty, not be done when the
1253  *          transmit holding register is empty.  This functionality
1254  *          allows an RS485 driver to be written in user space. 
1255  */
1256 static int get_lsr_info(struct async_struct * info, unsigned int *value)
1257 {
1258         unsigned char status;
1259         unsigned int result;
1260         unsigned long flags;
1261
1262         save_flags(flags); cli();
1263         status = custom.serdatr;
1264         mb();
1265         restore_flags(flags);
1266         result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1267         if (copy_to_user(value, &result, sizeof(int)))
1268                 return -EFAULT;
1269         return 0;
1270 }
1271
1272
1273 static int get_modem_info(struct async_struct * info, unsigned int *value)
1274 {
1275         unsigned char control, status;
1276         unsigned int result;
1277         unsigned long flags;
1278
1279         control = info->MCR;
1280         save_flags(flags); cli();
1281         status = ciab.pra;
1282         restore_flags(flags);
1283         result =  ((control & SER_RTS) ? TIOCM_RTS : 0)
1284                 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1285                 | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1286                 | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1287                 | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1288         if (copy_to_user(value, &result, sizeof(int)))
1289                 return -EFAULT;
1290         return 0;
1291 }
1292
1293 static int set_modem_info(struct async_struct * info, unsigned int cmd,
1294                           unsigned int *value)
1295 {
1296         unsigned int arg;
1297         unsigned long flags;
1298
1299         if (copy_from_user(&arg, value, sizeof(int)))
1300                 return -EFAULT;
1301
1302         switch (cmd) {
1303         case TIOCMBIS: 
1304                 if (arg & TIOCM_RTS)
1305                         info->MCR |= SER_RTS;
1306                 if (arg & TIOCM_DTR)
1307                         info->MCR |= SER_DTR;
1308                 break;
1309         case TIOCMBIC:
1310                 if (arg & TIOCM_RTS)
1311                         info->MCR &= ~SER_RTS;
1312                 if (arg & TIOCM_DTR)
1313                         info->MCR &= ~SER_DTR;
1314                 break;
1315         case TIOCMSET:
1316                 info->MCR = ((info->MCR & ~(SER_RTS | SER_DTR))
1317                              | ((arg & TIOCM_RTS) ? SER_RTS : 0)
1318                              | ((arg & TIOCM_DTR) ? SER_DTR : 0));
1319                 break;
1320         default:
1321                 return -EINVAL;
1322         }
1323         save_flags(flags); cli();
1324         rtsdtr_ctrl(info->MCR);
1325         restore_flags(flags);
1326         return 0;
1327 }
1328
1329 /*
1330  * rs_break() --- routine which turns the break handling on or off
1331  */
1332 static void rs_break(struct tty_struct *tty, int break_state)
1333 {
1334         struct async_struct * info = (struct async_struct *)tty->driver_data;
1335         unsigned long flags;
1336
1337         if (serial_paranoia_check(info, tty->device, "rs_break"))
1338                 return;
1339
1340         save_flags(flags); cli();
1341         if (break_state == -1)
1342           custom.adkcon = AC_SETCLR | AC_UARTBRK;
1343         else
1344           custom.adkcon = AC_UARTBRK;
1345         mb();
1346         restore_flags(flags);
1347 }
1348
1349
1350 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1351                     unsigned int cmd, unsigned long arg)
1352 {
1353         struct async_struct * info = (struct async_struct *)tty->driver_data;
1354         struct async_icount cprev, cnow;        /* kernel counter temps */
1355         struct serial_icounter_struct icount;
1356         unsigned long flags;
1357
1358         if (serial_paranoia_check(info, tty->device, "rs_ioctl"))
1359                 return -ENODEV;
1360
1361         if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1362             (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1363             (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1364                 if (tty->flags & (1 << TTY_IO_ERROR))
1365                     return -EIO;
1366         }
1367
1368         switch (cmd) {
1369                 case TIOCMGET:
1370                         return get_modem_info(info, (unsigned int *) arg);
1371                 case TIOCMBIS:
1372                 case TIOCMBIC:
1373                 case TIOCMSET:
1374                         return set_modem_info(info, cmd, (unsigned int *) arg);
1375                 case TIOCGSERIAL:
1376                         return get_serial_info(info,
1377                                                (struct serial_struct *) arg);
1378                 case TIOCSSERIAL:
1379                         return set_serial_info(info,
1380                                                (struct serial_struct *) arg);
1381                 case TIOCSERCONFIG:
1382                         return 0;
1383
1384                 case TIOCSERGETLSR: /* Get line status register */
1385                         return get_lsr_info(info, (unsigned int *) arg);
1386
1387                 case TIOCSERGSTRUCT:
1388                         if (copy_to_user((struct async_struct *) arg,
1389                                          info, sizeof(struct async_struct)))
1390                                 return -EFAULT;
1391                         return 0;
1392
1393                 /*
1394                  * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1395                  * - mask passed in arg for lines of interest
1396                  *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1397                  * Caller should use TIOCGICOUNT to see which one it was
1398                  */
1399                 case TIOCMIWAIT:
1400                         save_flags(flags); cli();
1401                         /* note the counters on entry */
1402                         cprev = info->state->icount;
1403                         restore_flags(flags);
1404                         while (1) {
1405                                 interruptible_sleep_on(&info->delta_msr_wait);
1406                                 /* see if a signal did it */
1407                                 if (signal_pending(current))
1408                                         return -ERESTARTSYS;
1409                                 save_flags(flags); cli();
1410                                 cnow = info->state->icount; /* atomic copy */
1411                                 restore_flags(flags);
1412                                 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr && 
1413                                     cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1414                                         return -EIO; /* no change => error */
1415                                 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1416                                      ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1417                                      ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1418                                      ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1419                                         return 0;
1420                                 }
1421                                 cprev = cnow;
1422                         }
1423                         /* NOTREACHED */
1424
1425                 /* 
1426                  * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1427                  * Return: write counters to the user passed counter struct
1428                  * NB: both 1->0 and 0->1 transitions are counted except for
1429                  *     RI where only 0->1 is counted.
1430                  */
1431                 case TIOCGICOUNT:
1432                         save_flags(flags); cli();
1433                         cnow = info->state->icount;
1434                         restore_flags(flags);
1435                         icount.cts = cnow.cts;
1436                         icount.dsr = cnow.dsr;
1437                         icount.rng = cnow.rng;
1438                         icount.dcd = cnow.dcd;
1439                         icount.rx = cnow.rx;
1440                         icount.tx = cnow.tx;
1441                         icount.frame = cnow.frame;
1442                         icount.overrun = cnow.overrun;
1443                         icount.parity = cnow.parity;
1444                         icount.brk = cnow.brk;
1445                         icount.buf_overrun = cnow.buf_overrun;
1446
1447                         if (copy_to_user((void *)arg, &icount, sizeof(icount)))
1448                                 return -EFAULT;
1449                         return 0;
1450                 case TIOCSERGWILD:
1451                 case TIOCSERSWILD:
1452                         /* "setserial -W" is called in Debian boot */
1453                         printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1454                         return 0;
1455
1456                 default:
1457                         return -ENOIOCTLCMD;
1458                 }
1459         return 0;
1460 }
1461
1462 static void rs_set_termios(struct tty_struct *tty, struct termios *old_termios)
1463 {
1464         struct async_struct *info = (struct async_struct *)tty->driver_data;
1465         unsigned long flags;
1466         unsigned int cflag = tty->termios->c_cflag;
1467
1468         if (   (cflag == old_termios->c_cflag)
1469             && (   RELEVANT_IFLAG(tty->termios->c_iflag) 
1470                 == RELEVANT_IFLAG(old_termios->c_iflag)))
1471           return;
1472
1473         change_speed(info, old_termios);
1474
1475         /* Handle transition to B0 status */
1476         if ((old_termios->c_cflag & CBAUD) &&
1477             !(cflag & CBAUD)) {
1478                 info->MCR &= ~(SER_DTR|SER_RTS);
1479                 save_flags(flags); cli();
1480                 rtsdtr_ctrl(info->MCR);
1481                 restore_flags(flags);
1482         }
1483
1484         /* Handle transition away from B0 status */
1485         if (!(old_termios->c_cflag & CBAUD) &&
1486             (cflag & CBAUD)) {
1487                 info->MCR |= SER_DTR;
1488                 if (!(tty->termios->c_cflag & CRTSCTS) || 
1489                     !test_bit(TTY_THROTTLED, &tty->flags)) {
1490                         info->MCR |= SER_RTS;
1491                 }
1492                 save_flags(flags); cli();
1493                 rtsdtr_ctrl(info->MCR);
1494                 restore_flags(flags);
1495         }
1496
1497         /* Handle turning off CRTSCTS */
1498         if ((old_termios->c_cflag & CRTSCTS) &&
1499             !(tty->termios->c_cflag & CRTSCTS)) {
1500                 tty->hw_stopped = 0;
1501                 rs_start(tty);
1502         }
1503
1504 #if 0
1505         /*
1506          * No need to wake up processes in open wait, since they
1507          * sample the CLOCAL flag once, and don't recheck it.
1508          * XXX  It's not clear whether the current behavior is correct
1509          * or not.  Hence, this may change.....
1510          */
1511         if (!(old_termios->c_cflag & CLOCAL) &&
1512             (tty->termios->c_cflag & CLOCAL))
1513                 wake_up_interruptible(&info->open_wait);
1514 #endif
1515 }
1516
1517 /*
1518  * ------------------------------------------------------------
1519  * rs_close()
1520  * 
1521  * This routine is called when the serial port gets closed.  First, we
1522  * wait for the last remaining data to be sent.  Then, we unlink its
1523  * async structure from the interrupt chain if necessary, and we free
1524  * that IRQ if nothing is left in the chain.
1525  * ------------------------------------------------------------
1526  */
1527 static void rs_close(struct tty_struct *tty, struct file * filp)
1528 {
1529         struct async_struct * info = (struct async_struct *)tty->driver_data;
1530         struct serial_state *state;
1531         unsigned long flags;
1532
1533         if (!info || serial_paranoia_check(info, tty->device, "rs_close"))
1534                 return;
1535
1536         state = info->state;
1537
1538         save_flags(flags); cli();
1539
1540         if (tty_hung_up_p(filp)) {
1541                 DBG_CNT("before DEC-hung");
1542                 MOD_DEC_USE_COUNT;
1543                 restore_flags(flags);
1544                 return;
1545         }
1546
1547 #ifdef SERIAL_DEBUG_OPEN
1548         printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1549 #endif
1550         if ((tty->count == 1) && (state->count != 1)) {
1551                 /*
1552                  * Uh, oh.  tty->count is 1, which means that the tty
1553                  * structure will be freed.  state->count should always
1554                  * be one in these conditions.  If it's greater than
1555                  * one, we've got real problems, since it means the
1556                  * serial port won't be shutdown.
1557                  */
1558                 printk("rs_close: bad serial port count; tty->count is 1, "
1559                        "state->count is %d\n", state->count);
1560                 state->count = 1;
1561         }
1562         if (--state->count < 0) {
1563                 printk("rs_close: bad serial port count for ttys%d: %d\n",
1564                        info->line, state->count);
1565                 state->count = 0;
1566         }
1567         if (state->count) {
1568                 DBG_CNT("before DEC-2");
1569                 MOD_DEC_USE_COUNT;
1570                 restore_flags(flags);
1571                 return;
1572         }
1573         info->flags |= ASYNC_CLOSING;
1574         /*
1575          * Save the termios structure, since this port may have
1576          * separate termios for callout and dialin.
1577          */
1578         if (info->flags & ASYNC_NORMAL_ACTIVE)
1579                 info->state->normal_termios = *tty->termios;
1580         if (info->flags & ASYNC_CALLOUT_ACTIVE)
1581                 info->state->callout_termios = *tty->termios;
1582         /*
1583          * Now we wait for the transmit buffer to clear; and we notify 
1584          * the line discipline to only process XON/XOFF characters.
1585          */
1586         tty->closing = 1;
1587         if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1588                 tty_wait_until_sent(tty, info->closing_wait);
1589         /*
1590          * At this point we stop accepting input.  To do this, we
1591          * disable the receive line status interrupts, and tell the
1592          * interrupt driver to stop checking the data ready bit in the
1593          * line status register.
1594          */
1595         info->read_status_mask &= ~UART_LSR_DR;
1596         if (info->flags & ASYNC_INITIALIZED) {
1597                 /* disable receive interrupts */
1598                 custom.intena = IF_RBF;
1599                 mb();
1600                 /* clear any pending receive interrupt */
1601                 custom.intreq = IF_RBF;
1602                 mb();
1603
1604                 /*
1605                  * Before we drop DTR, make sure the UART transmitter
1606                  * has completely drained; this is especially
1607                  * important if there is a transmit FIFO!
1608                  */
1609                 rs_wait_until_sent(tty, info->timeout);
1610         }
1611         shutdown(info);
1612         if (tty->driver.flush_buffer)
1613                 tty->driver.flush_buffer(tty);
1614         if (tty->ldisc.flush_buffer)
1615                 tty->ldisc.flush_buffer(tty);
1616         tty->closing = 0;
1617         info->event = 0;
1618         info->tty = 0;
1619         if (info->blocked_open) {
1620                 if (info->close_delay) {
1621                         current->state = TASK_INTERRUPTIBLE;
1622                         schedule_timeout(info->close_delay);
1623                 }
1624                 wake_up_interruptible(&info->open_wait);
1625         }
1626         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE|
1627                          ASYNC_CLOSING);
1628         wake_up_interruptible(&info->close_wait);
1629         MOD_DEC_USE_COUNT;
1630         restore_flags(flags);
1631 }
1632
1633 /*
1634  * rs_wait_until_sent() --- wait until the transmitter is empty
1635  */
1636 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1637 {
1638         struct async_struct * info = (struct async_struct *)tty->driver_data;
1639         unsigned long orig_jiffies, char_time;
1640         int lsr;
1641
1642         if (serial_paranoia_check(info, tty->device, "rs_wait_until_sent"))
1643                 return;
1644
1645         if (info->xmit_fifo_size == 0)
1646                 return; /* Just in case.... */
1647
1648         orig_jiffies = jiffies;
1649         /*
1650          * Set the check interval to be 1/5 of the estimated time to
1651          * send a single character, and make it at least 1.  The check
1652          * interval should also be less than the timeout.
1653          * 
1654          * Note: we have to use pretty tight timings here to satisfy
1655          * the NIST-PCTS.
1656          */
1657         char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1658         char_time = char_time / 5;
1659         if (char_time == 0)
1660                 char_time = 1;
1661         if (timeout)
1662           char_time = MIN(char_time, timeout);
1663         /*
1664          * If the transmitter hasn't cleared in twice the approximate
1665          * amount of time to send the entire FIFO, it probably won't
1666          * ever clear.  This assumes the UART isn't doing flow
1667          * control, which is currently the case.  Hence, if it ever
1668          * takes longer than info->timeout, this is probably due to a
1669          * UART bug of some kind.  So, we clamp the timeout parameter at
1670          * 2*info->timeout.
1671          */
1672         if (!timeout || timeout > 2*info->timeout)
1673                 timeout = 2*info->timeout;
1674 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1675         printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1676         printk("jiff=%lu...", jiffies);
1677 #endif
1678         while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1679 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1680                 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1681 #endif
1682                 current->state = TASK_INTERRUPTIBLE;
1683                 schedule_timeout(char_time);
1684                 if (signal_pending(current))
1685                         break;
1686                 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1687                         break;
1688         }
1689         current->state = TASK_RUNNING;
1690 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1691         printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1692 #endif
1693 }
1694
1695 /*
1696  * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1697  */
1698 static void rs_hangup(struct tty_struct *tty)
1699 {
1700         struct async_struct * info = (struct async_struct *)tty->driver_data;
1701         struct serial_state *state = info->state;
1702
1703         if (serial_paranoia_check(info, tty->device, "rs_hangup"))
1704                 return;
1705
1706         state = info->state;
1707
1708         rs_flush_buffer(tty);
1709         shutdown(info);
1710         info->event = 0;
1711         state->count = 0;
1712         info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CALLOUT_ACTIVE);
1713         info->tty = 0;
1714         wake_up_interruptible(&info->open_wait);
1715 }
1716
1717 /*
1718  * ------------------------------------------------------------
1719  * rs_open() and friends
1720  * ------------------------------------------------------------
1721  */
1722 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1723                            struct async_struct *info)
1724 {
1725 #ifdef DECLARE_WAITQUEUE
1726         DECLARE_WAITQUEUE(wait, current);
1727 #else
1728         struct wait_queue wait = { current, NULL };
1729 #endif
1730         struct serial_state *state = info->state;
1731         int             retval;
1732         int             do_clocal = 0, extra_count = 0;
1733         unsigned long   flags;
1734
1735         /*
1736          * If the device is in the middle of being closed, then block
1737          * until it's done, and then try again.
1738          */
1739         if (tty_hung_up_p(filp) ||
1740             (info->flags & ASYNC_CLOSING)) {
1741                 if (info->flags & ASYNC_CLOSING)
1742                         interruptible_sleep_on(&info->close_wait);
1743 #ifdef SERIAL_DO_RESTART
1744                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1745                         -EAGAIN : -ERESTARTSYS);
1746 #else
1747                 return -EAGAIN;
1748 #endif
1749         }
1750
1751         /*
1752          * If this is a callout device, then just make sure the normal
1753          * device isn't being used.
1754          */
1755         if (tty->driver.subtype == SERIAL_TYPE_CALLOUT) {
1756                 if (info->flags & ASYNC_NORMAL_ACTIVE)
1757                         return -EBUSY;
1758                 if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
1759                     (info->flags & ASYNC_SESSION_LOCKOUT) &&
1760                     (info->session != current->session))
1761                     return -EBUSY;
1762                 if ((info->flags & ASYNC_CALLOUT_ACTIVE) &&
1763                     (info->flags & ASYNC_PGRP_LOCKOUT) &&
1764                     (info->pgrp != current->pgrp))
1765                     return -EBUSY;
1766                 info->flags |= ASYNC_CALLOUT_ACTIVE;
1767                 return 0;
1768         }
1769
1770         /*
1771          * If non-blocking mode is set, or the port is not enabled,
1772          * then make the check up front and then exit.
1773          */
1774         if ((filp->f_flags & O_NONBLOCK) ||
1775             (tty->flags & (1 << TTY_IO_ERROR))) {
1776                 if (info->flags & ASYNC_CALLOUT_ACTIVE)
1777                         return -EBUSY;
1778                 info->flags |= ASYNC_NORMAL_ACTIVE;
1779                 return 0;
1780         }
1781
1782         if (info->flags & ASYNC_CALLOUT_ACTIVE) {
1783                 if (state->normal_termios.c_cflag & CLOCAL)
1784                         do_clocal = 1;
1785         } else {
1786                 if (tty->termios->c_cflag & CLOCAL)
1787                         do_clocal = 1;
1788         }
1789
1790         /*
1791          * Block waiting for the carrier detect and the line to become
1792          * free (i.e., not in use by the callout).  While we are in
1793          * this loop, state->count is dropped by one, so that
1794          * rs_close() knows when to free things.  We restore it upon
1795          * exit, either normal or abnormal.
1796          */
1797         retval = 0;
1798         add_wait_queue(&info->open_wait, &wait);
1799 #ifdef SERIAL_DEBUG_OPEN
1800         printk("block_til_ready before block: ttys%d, count = %d\n",
1801                state->line, state->count);
1802 #endif
1803         save_flags(flags); cli();
1804         if (!tty_hung_up_p(filp)) {
1805                 extra_count = 1;
1806                 state->count--;
1807         }
1808         restore_flags(flags);
1809         info->blocked_open++;
1810         while (1) {
1811                 save_flags(flags); cli();
1812                 if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
1813                     (tty->termios->c_cflag & CBAUD))
1814                         rtsdtr_ctrl(SER_DTR|SER_RTS);
1815                 restore_flags(flags);
1816                 set_current_state(TASK_INTERRUPTIBLE);
1817                 if (tty_hung_up_p(filp) ||
1818                     !(info->flags & ASYNC_INITIALIZED)) {
1819 #ifdef SERIAL_DO_RESTART
1820                         if (info->flags & ASYNC_HUP_NOTIFY)
1821                                 retval = -EAGAIN;
1822                         else
1823                                 retval = -ERESTARTSYS;
1824 #else
1825                         retval = -EAGAIN;
1826 #endif
1827                         break;
1828                 }
1829                 if (!(info->flags & ASYNC_CALLOUT_ACTIVE) &&
1830                     !(info->flags & ASYNC_CLOSING) &&
1831                     (do_clocal || (!(ciab.pra & SER_DCD)) ))
1832                         break;
1833                 if (signal_pending(current)) {
1834                         retval = -ERESTARTSYS;
1835                         break;
1836                 }
1837 #ifdef SERIAL_DEBUG_OPEN
1838                 printk("block_til_ready blocking: ttys%d, count = %d\n",
1839                        info->line, state->count);
1840 #endif
1841                 schedule();
1842         }
1843         current->state = TASK_RUNNING;
1844         remove_wait_queue(&info->open_wait, &wait);
1845         if (extra_count)
1846                 state->count++;
1847         info->blocked_open--;
1848 #ifdef SERIAL_DEBUG_OPEN
1849         printk("block_til_ready after blocking: ttys%d, count = %d\n",
1850                info->line, state->count);
1851 #endif
1852         if (retval)
1853                 return retval;
1854         info->flags |= ASYNC_NORMAL_ACTIVE;
1855         return 0;
1856 }
1857
1858 static int get_async_struct(int line, struct async_struct **ret_info)
1859 {
1860         struct async_struct *info;
1861         struct serial_state *sstate;
1862
1863         sstate = rs_table + line;
1864         sstate->count++;
1865         if (sstate->info) {
1866                 *ret_info = sstate->info;
1867                 return 0;
1868         }
1869         info = kmalloc(sizeof(struct async_struct), GFP_KERNEL);
1870         if (!info) {
1871                 sstate->count--;
1872                 return -ENOMEM;
1873         }
1874         memset(info, 0, sizeof(struct async_struct));
1875 #ifdef DECLARE_WAITQUEUE
1876         init_waitqueue_head(&info->open_wait);
1877         init_waitqueue_head(&info->close_wait);
1878         init_waitqueue_head(&info->delta_msr_wait);
1879 #endif
1880         info->magic = SERIAL_MAGIC;
1881         info->port = sstate->port;
1882         info->flags = sstate->flags;
1883         info->xmit_fifo_size = sstate->xmit_fifo_size;
1884         info->line = line;
1885         info->tqueue.routine = do_softint;
1886         info->tqueue.data = info;
1887         info->state = sstate;
1888         if (sstate->info) {
1889                 kfree(info);
1890                 *ret_info = sstate->info;
1891                 return 0;
1892         }
1893         *ret_info = sstate->info = info;
1894         return 0;
1895 }
1896
1897 /*
1898  * This routine is called whenever a serial port is opened.  It
1899  * enables interrupts for a serial port, linking in its async structure into
1900  * the IRQ chain.   It also performs the serial-specific
1901  * initialization for the tty structure.
1902  */
1903 static int rs_open(struct tty_struct *tty, struct file * filp)
1904 {
1905         struct async_struct     *info;
1906         int                     retval, line;
1907         unsigned long           page;
1908
1909         MOD_INC_USE_COUNT;
1910         line = MINOR(tty->device) - tty->driver.minor_start;
1911         if ((line < 0) || (line >= NR_PORTS)) {
1912                 MOD_DEC_USE_COUNT;
1913                 return -ENODEV;
1914         }
1915         retval = get_async_struct(line, &info);
1916         if (retval) {
1917                 MOD_DEC_USE_COUNT;
1918                 return retval;
1919         }
1920         tty->driver_data = info;
1921         info->tty = tty;
1922         if (serial_paranoia_check(info, tty->device, "rs_open"))
1923                 return -ENODEV;
1924
1925 #ifdef SERIAL_DEBUG_OPEN
1926         printk("rs_open %s%d, count = %d\n", tty->driver.name, info->line,
1927                info->state->count);
1928 #endif
1929         info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1930
1931         if (!tmp_buf) {
1932                 page = get_free_page(GFP_KERNEL);
1933                 if (!page) {
1934                         return -ENOMEM;
1935                 }
1936                 if (tmp_buf)
1937                         free_page(page);
1938                 else
1939                         tmp_buf = (unsigned char *) page;
1940         }
1941
1942         /*
1943          * If the port is the middle of closing, bail out now
1944          */
1945         if (tty_hung_up_p(filp) ||
1946             (info->flags & ASYNC_CLOSING)) {
1947                 if (info->flags & ASYNC_CLOSING)
1948                         interruptible_sleep_on(&info->close_wait);
1949 #ifdef SERIAL_DO_RESTART
1950                 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1951                         -EAGAIN : -ERESTARTSYS);
1952 #else
1953                 return -EAGAIN;
1954 #endif
1955         }
1956
1957         /*
1958          * Start up serial port
1959          */
1960         retval = startup(info);
1961         if (retval) {
1962                 return retval;
1963         }
1964
1965         retval = block_til_ready(tty, filp, info);
1966         if (retval) {
1967 #ifdef SERIAL_DEBUG_OPEN
1968                 printk("rs_open returning after block_til_ready with %d\n",
1969                        retval);
1970 #endif
1971                 return retval;
1972         }
1973
1974         if ((info->state->count == 1) &&
1975             (info->flags & ASYNC_SPLIT_TERMIOS)) {
1976                 if (tty->driver.subtype == SERIAL_TYPE_NORMAL)
1977                         *tty->termios = info->state->normal_termios;
1978                 else 
1979                         *tty->termios = info->state->callout_termios;
1980                 change_speed(info, 0);
1981         }
1982         info->session = current->session;
1983         info->pgrp = current->pgrp;
1984
1985 #ifdef SERIAL_DEBUG_OPEN
1986         printk("rs_open ttys%d successful...", info->line);
1987 #endif
1988         return 0;
1989 }
1990
1991 /*
1992  * /proc fs routines....
1993  */
1994
1995 static inline int line_info(char *buf, struct serial_state *state)
1996 {
1997         struct async_struct *info = state->info, scr_info;
1998         char    stat_buf[30], control, status;
1999         int     ret;
2000         unsigned long flags;
2001
2002         ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
2003
2004         /*
2005          * Figure out the current RS-232 lines
2006          */
2007         if (!info) {
2008                 info = &scr_info;       /* This is just for serial_{in,out} */
2009
2010                 info->magic = SERIAL_MAGIC;
2011                 info->flags = state->flags;
2012                 info->quot = 0;
2013                 info->tty = 0;
2014         }
2015         save_flags(flags); cli();
2016         status = ciab.pra;
2017         control = info ? info->MCR : status;
2018         restore_flags(flags); 
2019
2020         stat_buf[0] = 0;
2021         stat_buf[1] = 0;
2022         if(!(control & SER_RTS))
2023                 strcat(stat_buf, "|RTS");
2024         if(!(status & SER_CTS))
2025                 strcat(stat_buf, "|CTS");
2026         if(!(control & SER_DTR))
2027                 strcat(stat_buf, "|DTR");
2028         if(!(status & SER_DSR))
2029                 strcat(stat_buf, "|DSR");
2030         if(!(status & SER_DCD))
2031                 strcat(stat_buf, "|CD");
2032
2033         if (info->quot) {
2034                 ret += sprintf(buf+ret, " baud:%d",
2035                                state->baud_base / info->quot);
2036         }
2037
2038         ret += sprintf(buf+ret, " tx:%d rx:%d",
2039                       state->icount.tx, state->icount.rx);
2040
2041         if (state->icount.frame)
2042                 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
2043
2044         if (state->icount.parity)
2045                 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
2046
2047         if (state->icount.brk)
2048                 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
2049
2050         if (state->icount.overrun)
2051                 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
2052
2053         /*
2054          * Last thing is the RS-232 status lines
2055          */
2056         ret += sprintf(buf+ret, " %s\n", stat_buf+1);
2057         return ret;
2058 }
2059
2060 int rs_read_proc(char *page, char **start, off_t off, int count,
2061                  int *eof, void *data)
2062 {
2063         int len = 0, l;
2064         off_t   begin = 0;
2065
2066         len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
2067         l = line_info(page + len, &rs_table[0]);
2068         len += l;
2069         if (len+begin > off+count)
2070           goto done;
2071         if (len+begin < off) {
2072           begin += len;
2073           len = 0;
2074         }
2075         *eof = 1;
2076 done:
2077         if (off >= len+begin)
2078                 return 0;
2079         *start = page + (off-begin);
2080         return ((count < begin+len-off) ? count : begin+len-off);
2081 }
2082
2083 /*
2084  * ---------------------------------------------------------------------
2085  * rs_init() and friends
2086  *
2087  * rs_init() is called at boot-time to initialize the serial driver.
2088  * ---------------------------------------------------------------------
2089  */
2090
2091 /*
2092  * This routine prints out the appropriate serial driver version
2093  * number, and identifies which options were configured into this
2094  * driver.
2095  */
2096 static _INLINE_ void show_serial_version(void)
2097 {
2098         printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
2099 }
2100
2101
2102 int register_serial(struct serial_struct *req);
2103 void unregister_serial(int line);
2104
2105
2106 /*
2107  * The serial driver boot-time initialization code!
2108  */
2109 static int __init rs_init(void)
2110 {
2111         unsigned long flags;
2112         struct serial_state * state;
2113
2114         if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
2115                 return -ENODEV;
2116
2117         /*
2118          *  We request SERDAT and SERPER only, because the serial registers are
2119          *  too spreaded over the custom register space
2120          */
2121         if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
2122                 return -EBUSY;
2123
2124         init_bh(SERIAL_BH, do_serial_bh);
2125
2126         IRQ_ports = NULL;
2127
2128         show_serial_version();
2129
2130         /* Initialize the tty_driver structure */
2131
2132         memset(&serial_driver, 0, sizeof(struct tty_driver));
2133         serial_driver.magic = TTY_DRIVER_MAGIC;
2134         serial_driver.driver_name = "amiserial";
2135         serial_driver.name = "ttyS";
2136         serial_driver.major = TTY_MAJOR;
2137         serial_driver.minor_start = 64;
2138         serial_driver.num = 1;
2139         serial_driver.type = TTY_DRIVER_TYPE_SERIAL;
2140         serial_driver.subtype = SERIAL_TYPE_NORMAL;
2141         serial_driver.init_termios = tty_std_termios;
2142         serial_driver.init_termios.c_cflag =
2143                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2144         serial_driver.flags = TTY_DRIVER_REAL_RAW;
2145         serial_driver.refcount = &serial_refcount;
2146         serial_driver.table = serial_table;
2147         serial_driver.termios = serial_termios;
2148         serial_driver.termios_locked = serial_termios_locked;
2149
2150         serial_driver.open = rs_open;
2151         serial_driver.close = rs_close;
2152         serial_driver.write = rs_write;
2153         serial_driver.put_char = rs_put_char;
2154         serial_driver.flush_chars = rs_flush_chars;
2155         serial_driver.write_room = rs_write_room;
2156         serial_driver.chars_in_buffer = rs_chars_in_buffer;
2157         serial_driver.flush_buffer = rs_flush_buffer;
2158         serial_driver.ioctl = rs_ioctl;
2159         serial_driver.throttle = rs_throttle;
2160         serial_driver.unthrottle = rs_unthrottle;
2161         serial_driver.set_termios = rs_set_termios;
2162         serial_driver.stop = rs_stop;
2163         serial_driver.start = rs_start;
2164         serial_driver.hangup = rs_hangup;
2165         serial_driver.break_ctl = rs_break;
2166         serial_driver.send_xchar = rs_send_xchar;
2167         serial_driver.wait_until_sent = rs_wait_until_sent;
2168         serial_driver.read_proc = rs_read_proc;
2169
2170         /*
2171          * The callout device is just like normal device except for
2172          * major number and the subtype code.
2173          */
2174         callout_driver = serial_driver;
2175         callout_driver.name = "cua";
2176         callout_driver.major = TTYAUX_MAJOR;
2177         callout_driver.subtype = SERIAL_TYPE_CALLOUT;
2178         callout_driver.read_proc = 0;
2179         callout_driver.proc_entry = 0;
2180
2181         if (tty_register_driver(&serial_driver))
2182                 panic("Couldn't register serial driver\n");
2183         if (tty_register_driver(&callout_driver))
2184                 panic("Couldn't register callout driver\n");
2185
2186         state = rs_table;
2187         state->magic = SSTATE_MAGIC;
2188         state->port = (int)&custom.serdatr; /* Just to give it a value */
2189         state->line = 0;
2190         state->custom_divisor = 0;
2191         state->close_delay = 5*HZ/10;
2192         state->closing_wait = 30*HZ;
2193         state->callout_termios = callout_driver.init_termios;
2194         state->normal_termios = serial_driver.init_termios;
2195         state->icount.cts = state->icount.dsr = 
2196           state->icount.rng = state->icount.dcd = 0;
2197         state->icount.rx = state->icount.tx = 0;
2198         state->icount.frame = state->icount.parity = 0;
2199         state->icount.overrun = state->icount.brk = 0;
2200         /*
2201         if(state->port && check_region(state->port,REGION_LENGTH(state)))
2202           continue;
2203         */
2204
2205         printk(KERN_INFO "ttyS%02d is the amiga builtin serial port\n",
2206                        state->line);
2207
2208         /* Hardware set up */
2209
2210         state->baud_base = amiga_colorclock;
2211         state->xmit_fifo_size = 1;
2212
2213         save_flags (flags);
2214         cli();
2215
2216         /* set ISRs, and then disable the rx interrupts */
2217         request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2218         request_irq(IRQ_AMIGA_RBF, ser_rx_int, SA_INTERRUPT, "serial RX", state);
2219
2220         /* turn off Rx and Tx interrupts */
2221         custom.intena = IF_RBF | IF_TBE;
2222         mb();
2223
2224         /* clear any pending interrupt */
2225         custom.intreq = IF_RBF | IF_TBE;
2226         mb();
2227
2228         restore_flags (flags);
2229
2230         /*
2231          * set the appropriate directions for the modem control flags,
2232          * and clear RTS and DTR
2233          */
2234         ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
2235         ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
2236
2237         return 0;
2238 }
2239
2240 static __exit void rs_exit(void) 
2241 {
2242         unsigned long flags;
2243         int e1, e2;
2244         struct async_struct *info;
2245
2246         /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2247         save_flags(flags);
2248         cli();
2249         remove_bh(SERIAL_BH);
2250         if ((e1 = tty_unregister_driver(&serial_driver)))
2251                 printk("SERIAL: failed to unregister serial driver (%d)\n",
2252                        e1);
2253         if ((e2 = tty_unregister_driver(&callout_driver)))
2254                 printk("SERIAL: failed to unregister callout driver (%d)\n", 
2255                        e2);
2256         restore_flags(flags);
2257
2258         info = rs_table[0].info;
2259         if (info) {
2260           rs_table[0].info = NULL;
2261           kfree(info);
2262         }
2263
2264         if (tmp_buf) {
2265                 free_page((unsigned long) tmp_buf);
2266                 tmp_buf = NULL;
2267         }
2268
2269         release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2270 }
2271
2272 module_init(rs_init)
2273 module_exit(rs_exit)
2274
2275
2276 /*
2277  * ------------------------------------------------------------
2278  * Serial console driver
2279  * ------------------------------------------------------------
2280  */
2281 #ifdef CONFIG_SERIAL_CONSOLE
2282
2283 static void amiga_serial_putc(char c)
2284 {
2285         custom.serdat = (unsigned char)c | 0x100;
2286         while (!(custom.serdatr & 0x2000))
2287                 barrier();
2288 }
2289
2290 /*
2291  *      Print a string to the serial port trying not to disturb
2292  *      any possible real use of the port...
2293  *
2294  *      The console_lock must be held when we get here.
2295  */
2296 static void serial_console_write(struct console *co, const char *s,
2297                                 unsigned count)
2298 {
2299         unsigned short intena = custom.intenar;
2300
2301         custom.intena = IF_TBE;
2302
2303         while (count--) {
2304                 if (*s == '\n')
2305                         amiga_serial_putc('\r');
2306                 amiga_serial_putc(*s++);
2307         }
2308
2309         custom.intena = IF_SETCLR | (intena & IF_TBE);
2310 }
2311
2312 /*
2313  *      Receive character from the serial port
2314  */
2315 static int serial_console_wait_key(struct console *co)
2316 {
2317         unsigned short intena = custom.intenar;
2318         int ch;
2319
2320         custom.intena = IF_RBF;
2321
2322         while (!(custom.intreqr & IF_RBF))
2323                 barrier();
2324         ch = custom.serdatr & 0xff;
2325         custom.intreq = IF_RBF;
2326
2327         custom.intena = IF_SETCLR | (intena & IF_RBF);
2328
2329         return ch;
2330 }
2331
2332 static kdev_t serial_console_device(struct console *c)
2333 {
2334         return MKDEV(TTY_MAJOR, 64);
2335 }
2336
2337 static struct console sercons = {
2338         "ttyS",
2339         serial_console_write,
2340         NULL,
2341         serial_console_device,
2342         serial_console_wait_key,
2343         NULL,
2344         NULL,
2345         CON_PRINTBUFFER,
2346         -1,
2347         0,
2348         NULL
2349 };
2350
2351 /*
2352  *      Register console.
2353  */
2354 void __init serial_console_init(void)
2355 {
2356         register_console(&sercons);
2357 }
2358 #endif