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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [char/] [amiserial.c] - Blame information for rev 65

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1 62 marcus.erl
/*
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 void 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;
842
 
843
        info = tty->driver_data;
844
 
845
        if (serial_paranoia_check(info, tty->name, "rs_put_char"))
846
                return;
847
 
848
        if (!info->xmit.buf)
849
                return;
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;
857
        }
858
 
859
        info->xmit.buf[info->xmit.head++] = ch;
860
        info->xmit.head &= SERIAL_XMIT_SIZE-1;
861
        local_irq_restore(flags);
862
}
863
 
864
static void rs_flush_chars(struct tty_struct *tty)
865
{
866
        struct async_struct *info = (struct async_struct *)tty->driver_data;
867
        unsigned long flags;
868
 
869
        if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
870
                return;
871
 
872
        if (info->xmit.head == info->xmit.tail
873
            || tty->stopped
874
            || tty->hw_stopped
875
            || !info->xmit.buf)
876
                return;
877
 
878
        local_irq_save(flags);
879
        info->IER |= UART_IER_THRI;
880
        custom.intena = IF_SETCLR | IF_TBE;
881
        mb();
882
        /* set a pending Tx Interrupt, transmitter should restart now */
883
        custom.intreq = IF_SETCLR | IF_TBE;
884
        mb();
885
        local_irq_restore(flags);
886
}
887
 
888
static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
889
{
890
        int     c, ret = 0;
891
        struct async_struct *info;
892
        unsigned long flags;
893
 
894
        if (!tty)
895
                return 0;
896
 
897
        info = tty->driver_data;
898
 
899
        if (serial_paranoia_check(info, tty->name, "rs_write"))
900
                return 0;
901
 
902
        if (!info->xmit.buf)
903
                return 0;
904
 
905
        local_irq_save(flags);
906
        while (1) {
907
                c = CIRC_SPACE_TO_END(info->xmit.head,
908
                                      info->xmit.tail,
909
                                      SERIAL_XMIT_SIZE);
910
                if (count < c)
911
                        c = count;
912
                if (c <= 0) {
913
                        break;
914
                }
915
                memcpy(info->xmit.buf + info->xmit.head, buf, c);
916
                info->xmit.head = ((info->xmit.head + c) &
917
                                   (SERIAL_XMIT_SIZE-1));
918
                buf += c;
919
                count -= c;
920
                ret += c;
921
        }
922
        local_irq_restore(flags);
923
 
924
        if (info->xmit.head != info->xmit.tail
925
            && !tty->stopped
926
            && !tty->hw_stopped
927
            && !(info->IER & UART_IER_THRI)) {
928
                info->IER |= UART_IER_THRI;
929
                local_irq_disable();
930
                custom.intena = IF_SETCLR | IF_TBE;
931
                mb();
932
                /* set a pending Tx Interrupt, transmitter should restart now */
933
                custom.intreq = IF_SETCLR | IF_TBE;
934
                mb();
935
                local_irq_restore(flags);
936
        }
937
        return ret;
938
}
939
 
940
static int rs_write_room(struct tty_struct *tty)
941
{
942
        struct async_struct *info = (struct async_struct *)tty->driver_data;
943
 
944
        if (serial_paranoia_check(info, tty->name, "rs_write_room"))
945
                return 0;
946
        return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
947
}
948
 
949
static int rs_chars_in_buffer(struct tty_struct *tty)
950
{
951
        struct async_struct *info = (struct async_struct *)tty->driver_data;
952
 
953
        if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
954
                return 0;
955
        return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
956
}
957
 
958
static void rs_flush_buffer(struct tty_struct *tty)
959
{
960
        struct async_struct *info = (struct async_struct *)tty->driver_data;
961
        unsigned long flags;
962
 
963
        if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
964
                return;
965
        local_irq_save(flags);
966
        info->xmit.head = info->xmit.tail = 0;
967
        local_irq_restore(flags);
968
        tty_wakeup(tty);
969
}
970
 
971
/*
972
 * This function is used to send a high-priority XON/XOFF character to
973
 * the device
974
 */
975
static void rs_send_xchar(struct tty_struct *tty, char ch)
976
{
977
        struct async_struct *info = (struct async_struct *)tty->driver_data;
978
        unsigned long flags;
979
 
980
        if (serial_paranoia_check(info, tty->name, "rs_send_char"))
981
                return;
982
 
983
        info->x_char = ch;
984
        if (ch) {
985
                /* Make sure transmit interrupts are on */
986
 
987
                /* Check this ! */
988
                local_irq_save(flags);
989
                if(!(custom.intenar & IF_TBE)) {
990
                    custom.intena = IF_SETCLR | IF_TBE;
991
                    mb();
992
                    /* set a pending Tx Interrupt, transmitter should restart now */
993
                    custom.intreq = IF_SETCLR | IF_TBE;
994
                    mb();
995
                }
996
                local_irq_restore(flags);
997
 
998
                info->IER |= UART_IER_THRI;
999
        }
1000
}
1001
 
1002
/*
1003
 * ------------------------------------------------------------
1004
 * rs_throttle()
1005
 *
1006
 * This routine is called by the upper-layer tty layer to signal that
1007
 * incoming characters should be throttled.
1008
 * ------------------------------------------------------------
1009
 */
1010
static void rs_throttle(struct tty_struct * tty)
1011
{
1012
        struct async_struct *info = (struct async_struct *)tty->driver_data;
1013
        unsigned long flags;
1014
#ifdef SERIAL_DEBUG_THROTTLE
1015
        char    buf[64];
1016
 
1017
        printk("throttle %s: %d....\n", tty_name(tty, buf),
1018
               tty->ldisc.chars_in_buffer(tty));
1019
#endif
1020
 
1021
        if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1022
                return;
1023
 
1024
        if (I_IXOFF(tty))
1025
                rs_send_xchar(tty, STOP_CHAR(tty));
1026
 
1027
        if (tty->termios->c_cflag & CRTSCTS)
1028
                info->MCR &= ~SER_RTS;
1029
 
1030
        local_irq_save(flags);
1031
        rtsdtr_ctrl(info->MCR);
1032
        local_irq_restore(flags);
1033
}
1034
 
1035
static void rs_unthrottle(struct tty_struct * tty)
1036
{
1037
        struct async_struct *info = (struct async_struct *)tty->driver_data;
1038
        unsigned long flags;
1039
#ifdef SERIAL_DEBUG_THROTTLE
1040
        char    buf[64];
1041
 
1042
        printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1043
               tty->ldisc.chars_in_buffer(tty));
1044
#endif
1045
 
1046
        if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1047
                return;
1048
 
1049
        if (I_IXOFF(tty)) {
1050
                if (info->x_char)
1051
                        info->x_char = 0;
1052
                else
1053
                        rs_send_xchar(tty, START_CHAR(tty));
1054
        }
1055
        if (tty->termios->c_cflag & CRTSCTS)
1056
                info->MCR |= SER_RTS;
1057
        local_irq_save(flags);
1058
        rtsdtr_ctrl(info->MCR);
1059
        local_irq_restore(flags);
1060
}
1061
 
1062
/*
1063
 * ------------------------------------------------------------
1064
 * rs_ioctl() and friends
1065
 * ------------------------------------------------------------
1066
 */
1067
 
1068
static int get_serial_info(struct async_struct * info,
1069
                           struct serial_struct __user * retinfo)
1070
{
1071
        struct serial_struct tmp;
1072
        struct serial_state *state = info->state;
1073
 
1074
        if (!retinfo)
1075
                return -EFAULT;
1076
        memset(&tmp, 0, sizeof(tmp));
1077
        tmp.type = state->type;
1078
        tmp.line = state->line;
1079
        tmp.port = state->port;
1080
        tmp.irq = state->irq;
1081
        tmp.flags = state->flags;
1082
        tmp.xmit_fifo_size = state->xmit_fifo_size;
1083
        tmp.baud_base = state->baud_base;
1084
        tmp.close_delay = state->close_delay;
1085
        tmp.closing_wait = state->closing_wait;
1086
        tmp.custom_divisor = state->custom_divisor;
1087
        if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1088
                return -EFAULT;
1089
        return 0;
1090
}
1091
 
1092
static int set_serial_info(struct async_struct * info,
1093
                           struct serial_struct __user * new_info)
1094
{
1095
        struct serial_struct new_serial;
1096
        struct serial_state old_state, *state;
1097
        unsigned int            change_irq,change_port;
1098
        int                     retval = 0;
1099
 
1100
        if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1101
                return -EFAULT;
1102
        state = info->state;
1103
        old_state = *state;
1104
 
1105
        change_irq = new_serial.irq != state->irq;
1106
        change_port = (new_serial.port != state->port);
1107
        if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size))
1108
          return -EINVAL;
1109
 
1110
        if (!serial_isroot()) {
1111
                if ((new_serial.baud_base != state->baud_base) ||
1112
                    (new_serial.close_delay != state->close_delay) ||
1113
                    (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1114
                    ((new_serial.flags & ~ASYNC_USR_MASK) !=
1115
                     (state->flags & ~ASYNC_USR_MASK)))
1116
                        return -EPERM;
1117
                state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1118
                               (new_serial.flags & ASYNC_USR_MASK));
1119
                info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1120
                               (new_serial.flags & ASYNC_USR_MASK));
1121
                state->custom_divisor = new_serial.custom_divisor;
1122
                goto check_and_exit;
1123
        }
1124
 
1125
        if (new_serial.baud_base < 9600)
1126
                return -EINVAL;
1127
 
1128
        /*
1129
         * OK, past this point, all the error checking has been done.
1130
         * At this point, we start making changes.....
1131
         */
1132
 
1133
        state->baud_base = new_serial.baud_base;
1134
        state->flags = ((state->flags & ~ASYNC_FLAGS) |
1135
                        (new_serial.flags & ASYNC_FLAGS));
1136
        info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1137
                       (info->flags & ASYNC_INTERNAL_FLAGS));
1138
        state->custom_divisor = new_serial.custom_divisor;
1139
        state->close_delay = new_serial.close_delay * HZ/100;
1140
        state->closing_wait = new_serial.closing_wait * HZ/100;
1141
        info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1142
 
1143
check_and_exit:
1144
        if (info->flags & ASYNC_INITIALIZED) {
1145
                if (((old_state.flags & ASYNC_SPD_MASK) !=
1146
                     (state->flags & ASYNC_SPD_MASK)) ||
1147
                    (old_state.custom_divisor != state->custom_divisor)) {
1148
                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1149
                                info->tty->alt_speed = 57600;
1150
                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1151
                                info->tty->alt_speed = 115200;
1152
                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1153
                                info->tty->alt_speed = 230400;
1154
                        if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1155
                                info->tty->alt_speed = 460800;
1156
                        change_speed(info, NULL);
1157
                }
1158
        } else
1159
                retval = startup(info);
1160
        return retval;
1161
}
1162
 
1163
 
1164
/*
1165
 * get_lsr_info - get line status register info
1166
 *
1167
 * Purpose: Let user call ioctl() to get info when the UART physically
1168
 *          is emptied.  On bus types like RS485, the transmitter must
1169
 *          release the bus after transmitting. This must be done when
1170
 *          the transmit shift register is empty, not be done when the
1171
 *          transmit holding register is empty.  This functionality
1172
 *          allows an RS485 driver to be written in user space.
1173
 */
1174
static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
1175
{
1176
        unsigned char status;
1177
        unsigned int result;
1178
        unsigned long flags;
1179
 
1180
        local_irq_save(flags);
1181
        status = custom.serdatr;
1182
        mb();
1183
        local_irq_restore(flags);
1184
        result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1185
        if (copy_to_user(value, &result, sizeof(int)))
1186
                return -EFAULT;
1187
        return 0;
1188
}
1189
 
1190
 
1191
static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1192
{
1193
        struct async_struct * info = (struct async_struct *)tty->driver_data;
1194
        unsigned char control, status;
1195
        unsigned long flags;
1196
 
1197
        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1198
                return -ENODEV;
1199
        if (tty->flags & (1 << TTY_IO_ERROR))
1200
                return -EIO;
1201
 
1202
        control = info->MCR;
1203
        local_irq_save(flags);
1204
        status = ciab.pra;
1205
        local_irq_restore(flags);
1206
        return    ((control & SER_RTS) ? TIOCM_RTS : 0)
1207
                | ((control & SER_DTR) ? TIOCM_DTR : 0)
1208
                | (!(status  & SER_DCD) ? TIOCM_CAR : 0)
1209
                | (!(status  & SER_DSR) ? TIOCM_DSR : 0)
1210
                | (!(status  & SER_CTS) ? TIOCM_CTS : 0);
1211
}
1212
 
1213
static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1214
                       unsigned int set, unsigned int clear)
1215
{
1216
        struct async_struct * info = (struct async_struct *)tty->driver_data;
1217
        unsigned long flags;
1218
 
1219
        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1220
                return -ENODEV;
1221
        if (tty->flags & (1 << TTY_IO_ERROR))
1222
                return -EIO;
1223
 
1224
        local_irq_save(flags);
1225
        if (set & TIOCM_RTS)
1226
                info->MCR |= SER_RTS;
1227
        if (set & TIOCM_DTR)
1228
                info->MCR |= SER_DTR;
1229
        if (clear & TIOCM_RTS)
1230
                info->MCR &= ~SER_RTS;
1231
        if (clear & TIOCM_DTR)
1232
                info->MCR &= ~SER_DTR;
1233
        rtsdtr_ctrl(info->MCR);
1234
        local_irq_restore(flags);
1235
        return 0;
1236
}
1237
 
1238
/*
1239
 * rs_break() --- routine which turns the break handling on or off
1240
 */
1241
static void rs_break(struct tty_struct *tty, int break_state)
1242
{
1243
        struct async_struct * info = (struct async_struct *)tty->driver_data;
1244
        unsigned long flags;
1245
 
1246
        if (serial_paranoia_check(info, tty->name, "rs_break"))
1247
                return;
1248
 
1249
        local_irq_save(flags);
1250
        if (break_state == -1)
1251
          custom.adkcon = AC_SETCLR | AC_UARTBRK;
1252
        else
1253
          custom.adkcon = AC_UARTBRK;
1254
        mb();
1255
        local_irq_restore(flags);
1256
}
1257
 
1258
 
1259
static int rs_ioctl(struct tty_struct *tty, struct file * file,
1260
                    unsigned int cmd, unsigned long arg)
1261
{
1262
        struct async_struct * info = (struct async_struct *)tty->driver_data;
1263
        struct async_icount cprev, cnow;        /* kernel counter temps */
1264
        struct serial_icounter_struct icount;
1265
        void __user *argp = (void __user *)arg;
1266
        unsigned long flags;
1267
 
1268
        if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1269
                return -ENODEV;
1270
 
1271
        if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1272
            (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1273
            (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1274
                if (tty->flags & (1 << TTY_IO_ERROR))
1275
                    return -EIO;
1276
        }
1277
 
1278
        switch (cmd) {
1279
                case TIOCGSERIAL:
1280
                        return get_serial_info(info, argp);
1281
                case TIOCSSERIAL:
1282
                        return set_serial_info(info, argp);
1283
                case TIOCSERCONFIG:
1284
                        return 0;
1285
 
1286
                case TIOCSERGETLSR: /* Get line status register */
1287
                        return get_lsr_info(info, argp);
1288
 
1289
                case TIOCSERGSTRUCT:
1290
                        if (copy_to_user(argp,
1291
                                         info, sizeof(struct async_struct)))
1292
                                return -EFAULT;
1293
                        return 0;
1294
 
1295
                /*
1296
                 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1297
                 * - mask passed in arg for lines of interest
1298
                 *   (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1299
                 * Caller should use TIOCGICOUNT to see which one it was
1300
                 */
1301
                case TIOCMIWAIT:
1302
                        local_irq_save(flags);
1303
                        /* note the counters on entry */
1304
                        cprev = info->state->icount;
1305
                        local_irq_restore(flags);
1306
                        while (1) {
1307
                                interruptible_sleep_on(&info->delta_msr_wait);
1308
                                /* see if a signal did it */
1309
                                if (signal_pending(current))
1310
                                        return -ERESTARTSYS;
1311
                                local_irq_save(flags);
1312
                                cnow = info->state->icount; /* atomic copy */
1313
                                local_irq_restore(flags);
1314
                                if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1315
                                    cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1316
                                        return -EIO; /* no change => error */
1317
                                if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1318
                                     ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1319
                                     ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1320
                                     ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1321
                                        return 0;
1322
                                }
1323
                                cprev = cnow;
1324
                        }
1325
                        /* NOTREACHED */
1326
 
1327
                /*
1328
                 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1329
                 * Return: write counters to the user passed counter struct
1330
                 * NB: both 1->0 and 0->1 transitions are counted except for
1331
                 *     RI where only 0->1 is counted.
1332
                 */
1333
                case TIOCGICOUNT:
1334
                        local_irq_save(flags);
1335
                        cnow = info->state->icount;
1336
                        local_irq_restore(flags);
1337
                        icount.cts = cnow.cts;
1338
                        icount.dsr = cnow.dsr;
1339
                        icount.rng = cnow.rng;
1340
                        icount.dcd = cnow.dcd;
1341
                        icount.rx = cnow.rx;
1342
                        icount.tx = cnow.tx;
1343
                        icount.frame = cnow.frame;
1344
                        icount.overrun = cnow.overrun;
1345
                        icount.parity = cnow.parity;
1346
                        icount.brk = cnow.brk;
1347
                        icount.buf_overrun = cnow.buf_overrun;
1348
 
1349
                        if (copy_to_user(argp, &icount, sizeof(icount)))
1350
                                return -EFAULT;
1351
                        return 0;
1352
                case TIOCSERGWILD:
1353
                case TIOCSERSWILD:
1354
                        /* "setserial -W" is called in Debian boot */
1355
                        printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1356
                        return 0;
1357
 
1358
                default:
1359
                        return -ENOIOCTLCMD;
1360
                }
1361
        return 0;
1362
}
1363
 
1364
static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1365
{
1366
        struct async_struct *info = (struct async_struct *)tty->driver_data;
1367
        unsigned long flags;
1368
        unsigned int cflag = tty->termios->c_cflag;
1369
 
1370
        change_speed(info, old_termios);
1371
 
1372
        /* Handle transition to B0 status */
1373
        if ((old_termios->c_cflag & CBAUD) &&
1374
            !(cflag & CBAUD)) {
1375
                info->MCR &= ~(SER_DTR|SER_RTS);
1376
                local_irq_save(flags);
1377
                rtsdtr_ctrl(info->MCR);
1378
                local_irq_restore(flags);
1379
        }
1380
 
1381
        /* Handle transition away from B0 status */
1382
        if (!(old_termios->c_cflag & CBAUD) &&
1383
            (cflag & CBAUD)) {
1384
                info->MCR |= SER_DTR;
1385
                if (!(tty->termios->c_cflag & CRTSCTS) ||
1386
                    !test_bit(TTY_THROTTLED, &tty->flags)) {
1387
                        info->MCR |= SER_RTS;
1388
                }
1389
                local_irq_save(flags);
1390
                rtsdtr_ctrl(info->MCR);
1391
                local_irq_restore(flags);
1392
        }
1393
 
1394
        /* Handle turning off CRTSCTS */
1395
        if ((old_termios->c_cflag & CRTSCTS) &&
1396
            !(tty->termios->c_cflag & CRTSCTS)) {
1397
                tty->hw_stopped = 0;
1398
                rs_start(tty);
1399
        }
1400
 
1401
#if 0
1402
        /*
1403
         * No need to wake up processes in open wait, since they
1404
         * sample the CLOCAL flag once, and don't recheck it.
1405
         * XXX  It's not clear whether the current behavior is correct
1406
         * or not.  Hence, this may change.....
1407
         */
1408
        if (!(old_termios->c_cflag & CLOCAL) &&
1409
            (tty->termios->c_cflag & CLOCAL))
1410
                wake_up_interruptible(&info->open_wait);
1411
#endif
1412
}
1413
 
1414
/*
1415
 * ------------------------------------------------------------
1416
 * rs_close()
1417
 *
1418
 * This routine is called when the serial port gets closed.  First, we
1419
 * wait for the last remaining data to be sent.  Then, we unlink its
1420
 * async structure from the interrupt chain if necessary, and we free
1421
 * that IRQ if nothing is left in the chain.
1422
 * ------------------------------------------------------------
1423
 */
1424
static void rs_close(struct tty_struct *tty, struct file * filp)
1425
{
1426
        struct async_struct * info = (struct async_struct *)tty->driver_data;
1427
        struct serial_state *state;
1428
        unsigned long flags;
1429
 
1430
        if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1431
                return;
1432
 
1433
        state = info->state;
1434
 
1435
        local_irq_save(flags);
1436
 
1437
        if (tty_hung_up_p(filp)) {
1438
                DBG_CNT("before DEC-hung");
1439
                local_irq_restore(flags);
1440
                return;
1441
        }
1442
 
1443
#ifdef SERIAL_DEBUG_OPEN
1444
        printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1445
#endif
1446
        if ((tty->count == 1) && (state->count != 1)) {
1447
                /*
1448
                 * Uh, oh.  tty->count is 1, which means that the tty
1449
                 * structure will be freed.  state->count should always
1450
                 * be one in these conditions.  If it's greater than
1451
                 * one, we've got real problems, since it means the
1452
                 * serial port won't be shutdown.
1453
                 */
1454
                printk("rs_close: bad serial port count; tty->count is 1, "
1455
                       "state->count is %d\n", state->count);
1456
                state->count = 1;
1457
        }
1458
        if (--state->count < 0) {
1459
                printk("rs_close: bad serial port count for ttys%d: %d\n",
1460
                       info->line, state->count);
1461
                state->count = 0;
1462
        }
1463
        if (state->count) {
1464
                DBG_CNT("before DEC-2");
1465
                local_irq_restore(flags);
1466
                return;
1467
        }
1468
        info->flags |= ASYNC_CLOSING;
1469
        /*
1470
         * Now we wait for the transmit buffer to clear; and we notify
1471
         * the line discipline to only process XON/XOFF characters.
1472
         */
1473
        tty->closing = 1;
1474
        if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1475
                tty_wait_until_sent(tty, info->closing_wait);
1476
        /*
1477
         * At this point we stop accepting input.  To do this, we
1478
         * disable the receive line status interrupts, and tell the
1479
         * interrupt driver to stop checking the data ready bit in the
1480
         * line status register.
1481
         */
1482
        info->read_status_mask &= ~UART_LSR_DR;
1483
        if (info->flags & ASYNC_INITIALIZED) {
1484
                /* disable receive interrupts */
1485
                custom.intena = IF_RBF;
1486
                mb();
1487
                /* clear any pending receive interrupt */
1488
                custom.intreq = IF_RBF;
1489
                mb();
1490
 
1491
                /*
1492
                 * Before we drop DTR, make sure the UART transmitter
1493
                 * has completely drained; this is especially
1494
                 * important if there is a transmit FIFO!
1495
                 */
1496
                rs_wait_until_sent(tty, info->timeout);
1497
        }
1498
        shutdown(info);
1499
        if (tty->driver->flush_buffer)
1500
                tty->driver->flush_buffer(tty);
1501
 
1502
        tty_ldisc_flush(tty);
1503
        tty->closing = 0;
1504
        info->event = 0;
1505
        info->tty = NULL;
1506
        if (info->blocked_open) {
1507
                if (info->close_delay) {
1508
                        msleep_interruptible(jiffies_to_msecs(info->close_delay));
1509
                }
1510
                wake_up_interruptible(&info->open_wait);
1511
        }
1512
        info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1513
        wake_up_interruptible(&info->close_wait);
1514
        local_irq_restore(flags);
1515
}
1516
 
1517
/*
1518
 * rs_wait_until_sent() --- wait until the transmitter is empty
1519
 */
1520
static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1521
{
1522
        struct async_struct * info = (struct async_struct *)tty->driver_data;
1523
        unsigned long orig_jiffies, char_time;
1524
        int lsr;
1525
 
1526
        if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1527
                return;
1528
 
1529
        if (info->xmit_fifo_size == 0)
1530
                return; /* Just in case.... */
1531
 
1532
        orig_jiffies = jiffies;
1533
        /*
1534
         * Set the check interval to be 1/5 of the estimated time to
1535
         * send a single character, and make it at least 1.  The check
1536
         * interval should also be less than the timeout.
1537
         *
1538
         * Note: we have to use pretty tight timings here to satisfy
1539
         * the NIST-PCTS.
1540
         */
1541
        char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1542
        char_time = char_time / 5;
1543
        if (char_time == 0)
1544
                char_time = 1;
1545
        if (timeout)
1546
          char_time = min_t(unsigned long, char_time, timeout);
1547
        /*
1548
         * If the transmitter hasn't cleared in twice the approximate
1549
         * amount of time to send the entire FIFO, it probably won't
1550
         * ever clear.  This assumes the UART isn't doing flow
1551
         * control, which is currently the case.  Hence, if it ever
1552
         * takes longer than info->timeout, this is probably due to a
1553
         * UART bug of some kind.  So, we clamp the timeout parameter at
1554
         * 2*info->timeout.
1555
         */
1556
        if (!timeout || timeout > 2*info->timeout)
1557
                timeout = 2*info->timeout;
1558
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1559
        printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1560
        printk("jiff=%lu...", jiffies);
1561
#endif
1562
        while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1563
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1564
                printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1565
#endif
1566
                msleep_interruptible(jiffies_to_msecs(char_time));
1567
                if (signal_pending(current))
1568
                        break;
1569
                if (timeout && time_after(jiffies, orig_jiffies + timeout))
1570
                        break;
1571
        }
1572
        __set_current_state(TASK_RUNNING);
1573
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1574
        printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1575
#endif
1576
}
1577
 
1578
/*
1579
 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1580
 */
1581
static void rs_hangup(struct tty_struct *tty)
1582
{
1583
        struct async_struct * info = (struct async_struct *)tty->driver_data;
1584
        struct serial_state *state = info->state;
1585
 
1586
        if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1587
                return;
1588
 
1589
        state = info->state;
1590
 
1591
        rs_flush_buffer(tty);
1592
        shutdown(info);
1593
        info->event = 0;
1594
        state->count = 0;
1595
        info->flags &= ~ASYNC_NORMAL_ACTIVE;
1596
        info->tty = NULL;
1597
        wake_up_interruptible(&info->open_wait);
1598
}
1599
 
1600
/*
1601
 * ------------------------------------------------------------
1602
 * rs_open() and friends
1603
 * ------------------------------------------------------------
1604
 */
1605
static int block_til_ready(struct tty_struct *tty, struct file * filp,
1606
                           struct async_struct *info)
1607
{
1608
#ifdef DECLARE_WAITQUEUE
1609
        DECLARE_WAITQUEUE(wait, current);
1610
#else
1611
        struct wait_queue wait = { current, NULL };
1612
#endif
1613
        struct serial_state *state = info->state;
1614
        int             retval;
1615
        int             do_clocal = 0, extra_count = 0;
1616
        unsigned long   flags;
1617
 
1618
        /*
1619
         * If the device is in the middle of being closed, then block
1620
         * until it's done, and then try again.
1621
         */
1622
        if (tty_hung_up_p(filp) ||
1623
            (info->flags & ASYNC_CLOSING)) {
1624
                if (info->flags & ASYNC_CLOSING)
1625
                        interruptible_sleep_on(&info->close_wait);
1626
#ifdef SERIAL_DO_RESTART
1627
                return ((info->flags & ASYNC_HUP_NOTIFY) ?
1628
                        -EAGAIN : -ERESTARTSYS);
1629
#else
1630
                return -EAGAIN;
1631
#endif
1632
        }
1633
 
1634
        /*
1635
         * If non-blocking mode is set, or the port is not enabled,
1636
         * then make the check up front and then exit.
1637
         */
1638
        if ((filp->f_flags & O_NONBLOCK) ||
1639
            (tty->flags & (1 << TTY_IO_ERROR))) {
1640
                info->flags |= ASYNC_NORMAL_ACTIVE;
1641
                return 0;
1642
        }
1643
 
1644
        if (tty->termios->c_cflag & CLOCAL)
1645
                do_clocal = 1;
1646
 
1647
        /*
1648
         * Block waiting for the carrier detect and the line to become
1649
         * free (i.e., not in use by the callout).  While we are in
1650
         * this loop, state->count is dropped by one, so that
1651
         * rs_close() knows when to free things.  We restore it upon
1652
         * exit, either normal or abnormal.
1653
         */
1654
        retval = 0;
1655
        add_wait_queue(&info->open_wait, &wait);
1656
#ifdef SERIAL_DEBUG_OPEN
1657
        printk("block_til_ready before block: ttys%d, count = %d\n",
1658
               state->line, state->count);
1659
#endif
1660
        local_irq_save(flags);
1661
        if (!tty_hung_up_p(filp)) {
1662
                extra_count = 1;
1663
                state->count--;
1664
        }
1665
        local_irq_restore(flags);
1666
        info->blocked_open++;
1667
        while (1) {
1668
                local_irq_save(flags);
1669
                if (tty->termios->c_cflag & CBAUD)
1670
                        rtsdtr_ctrl(SER_DTR|SER_RTS);
1671
                local_irq_restore(flags);
1672
                set_current_state(TASK_INTERRUPTIBLE);
1673
                if (tty_hung_up_p(filp) ||
1674
                    !(info->flags & ASYNC_INITIALIZED)) {
1675
#ifdef SERIAL_DO_RESTART
1676
                        if (info->flags & ASYNC_HUP_NOTIFY)
1677
                                retval = -EAGAIN;
1678
                        else
1679
                                retval = -ERESTARTSYS;
1680
#else
1681
                        retval = -EAGAIN;
1682
#endif
1683
                        break;
1684
                }
1685
                if (!(info->flags & ASYNC_CLOSING) &&
1686
                    (do_clocal || (!(ciab.pra & SER_DCD)) ))
1687
                        break;
1688
                if (signal_pending(current)) {
1689
                        retval = -ERESTARTSYS;
1690
                        break;
1691
                }
1692
#ifdef SERIAL_DEBUG_OPEN
1693
                printk("block_til_ready blocking: ttys%d, count = %d\n",
1694
                       info->line, state->count);
1695
#endif
1696
                schedule();
1697
        }
1698
        __set_current_state(TASK_RUNNING);
1699
        remove_wait_queue(&info->open_wait, &wait);
1700
        if (extra_count)
1701
                state->count++;
1702
        info->blocked_open--;
1703
#ifdef SERIAL_DEBUG_OPEN
1704
        printk("block_til_ready after blocking: ttys%d, count = %d\n",
1705
               info->line, state->count);
1706
#endif
1707
        if (retval)
1708
                return retval;
1709
        info->flags |= ASYNC_NORMAL_ACTIVE;
1710
        return 0;
1711
}
1712
 
1713
static int get_async_struct(int line, struct async_struct **ret_info)
1714
{
1715
        struct async_struct *info;
1716
        struct serial_state *sstate;
1717
 
1718
        sstate = rs_table + line;
1719
        sstate->count++;
1720
        if (sstate->info) {
1721
                *ret_info = sstate->info;
1722
                return 0;
1723
        }
1724
        info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1725
        if (!info) {
1726
                sstate->count--;
1727
                return -ENOMEM;
1728
        }
1729
#ifdef DECLARE_WAITQUEUE
1730
        init_waitqueue_head(&info->open_wait);
1731
        init_waitqueue_head(&info->close_wait);
1732
        init_waitqueue_head(&info->delta_msr_wait);
1733
#endif
1734
        info->magic = SERIAL_MAGIC;
1735
        info->port = sstate->port;
1736
        info->flags = sstate->flags;
1737
        info->xmit_fifo_size = sstate->xmit_fifo_size;
1738
        info->line = line;
1739
        tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1740
        info->state = sstate;
1741
        if (sstate->info) {
1742
                kfree(info);
1743
                *ret_info = sstate->info;
1744
                return 0;
1745
        }
1746
        *ret_info = sstate->info = info;
1747
        return 0;
1748
}
1749
 
1750
/*
1751
 * This routine is called whenever a serial port is opened.  It
1752
 * enables interrupts for a serial port, linking in its async structure into
1753
 * the IRQ chain.   It also performs the serial-specific
1754
 * initialization for the tty structure.
1755
 */
1756
static int rs_open(struct tty_struct *tty, struct file * filp)
1757
{
1758
        struct async_struct     *info;
1759
        int                     retval, line;
1760
 
1761
        line = tty->index;
1762
        if ((line < 0) || (line >= NR_PORTS)) {
1763
                return -ENODEV;
1764
        }
1765
        retval = get_async_struct(line, &info);
1766
        if (retval) {
1767
                return retval;
1768
        }
1769
        tty->driver_data = info;
1770
        info->tty = tty;
1771
        if (serial_paranoia_check(info, tty->name, "rs_open"))
1772
                return -ENODEV;
1773
 
1774
#ifdef SERIAL_DEBUG_OPEN
1775
        printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1776
#endif
1777
        info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1778
 
1779
        /*
1780
         * If the port is the middle of closing, bail out now
1781
         */
1782
        if (tty_hung_up_p(filp) ||
1783
            (info->flags & ASYNC_CLOSING)) {
1784
                if (info->flags & ASYNC_CLOSING)
1785
                        interruptible_sleep_on(&info->close_wait);
1786
#ifdef SERIAL_DO_RESTART
1787
                return ((info->flags & ASYNC_HUP_NOTIFY) ?
1788
                        -EAGAIN : -ERESTARTSYS);
1789
#else
1790
                return -EAGAIN;
1791
#endif
1792
        }
1793
 
1794
        /*
1795
         * Start up serial port
1796
         */
1797
        retval = startup(info);
1798
        if (retval) {
1799
                return retval;
1800
        }
1801
 
1802
        retval = block_til_ready(tty, filp, info);
1803
        if (retval) {
1804
#ifdef SERIAL_DEBUG_OPEN
1805
                printk("rs_open returning after block_til_ready with %d\n",
1806
                       retval);
1807
#endif
1808
                return retval;
1809
        }
1810
 
1811
#ifdef SERIAL_DEBUG_OPEN
1812
        printk("rs_open %s successful...", tty->name);
1813
#endif
1814
        return 0;
1815
}
1816
 
1817
/*
1818
 * /proc fs routines....
1819
 */
1820
 
1821
static inline int line_info(char *buf, struct serial_state *state)
1822
{
1823
        struct async_struct *info = state->info, scr_info;
1824
        char    stat_buf[30], control, status;
1825
        int     ret;
1826
        unsigned long flags;
1827
 
1828
        ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1829
 
1830
        /*
1831
         * Figure out the current RS-232 lines
1832
         */
1833
        if (!info) {
1834
                info = &scr_info;       /* This is just for serial_{in,out} */
1835
 
1836
                info->magic = SERIAL_MAGIC;
1837
                info->flags = state->flags;
1838
                info->quot = 0;
1839
                info->tty = NULL;
1840
        }
1841
        local_irq_save(flags);
1842
        status = ciab.pra;
1843
        control = info ? info->MCR : status;
1844
        local_irq_restore(flags);
1845
 
1846
        stat_buf[0] = 0;
1847
        stat_buf[1] = 0;
1848
        if(!(control & SER_RTS))
1849
                strcat(stat_buf, "|RTS");
1850
        if(!(status & SER_CTS))
1851
                strcat(stat_buf, "|CTS");
1852
        if(!(control & SER_DTR))
1853
                strcat(stat_buf, "|DTR");
1854
        if(!(status & SER_DSR))
1855
                strcat(stat_buf, "|DSR");
1856
        if(!(status & SER_DCD))
1857
                strcat(stat_buf, "|CD");
1858
 
1859
        if (info->quot) {
1860
                ret += sprintf(buf+ret, " baud:%d",
1861
                               state->baud_base / info->quot);
1862
        }
1863
 
1864
        ret += sprintf(buf+ret, " tx:%d rx:%d",
1865
                      state->icount.tx, state->icount.rx);
1866
 
1867
        if (state->icount.frame)
1868
                ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1869
 
1870
        if (state->icount.parity)
1871
                ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1872
 
1873
        if (state->icount.brk)
1874
                ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1875
 
1876
        if (state->icount.overrun)
1877
                ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1878
 
1879
        /*
1880
         * Last thing is the RS-232 status lines
1881
         */
1882
        ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1883
        return ret;
1884
}
1885
 
1886
static int rs_read_proc(char *page, char **start, off_t off, int count,
1887
                        int *eof, void *data)
1888
{
1889
        int len = 0, l;
1890
        off_t   begin = 0;
1891
 
1892
        len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1893
        l = line_info(page + len, &rs_table[0]);
1894
        len += l;
1895
        if (len+begin > off+count)
1896
          goto done;
1897
        if (len+begin < off) {
1898
          begin += len;
1899
          len = 0;
1900
        }
1901
        *eof = 1;
1902
done:
1903
        if (off >= len+begin)
1904
                return 0;
1905
        *start = page + (off-begin);
1906
        return ((count < begin+len-off) ? count : begin+len-off);
1907
}
1908
 
1909
/*
1910
 * ---------------------------------------------------------------------
1911
 * rs_init() and friends
1912
 *
1913
 * rs_init() is called at boot-time to initialize the serial driver.
1914
 * ---------------------------------------------------------------------
1915
 */
1916
 
1917
/*
1918
 * This routine prints out the appropriate serial driver version
1919
 * number, and identifies which options were configured into this
1920
 * driver.
1921
 */
1922
static void show_serial_version(void)
1923
{
1924
        printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1925
}
1926
 
1927
 
1928
static const struct tty_operations serial_ops = {
1929
        .open = rs_open,
1930
        .close = rs_close,
1931
        .write = rs_write,
1932
        .put_char = rs_put_char,
1933
        .flush_chars = rs_flush_chars,
1934
        .write_room = rs_write_room,
1935
        .chars_in_buffer = rs_chars_in_buffer,
1936
        .flush_buffer = rs_flush_buffer,
1937
        .ioctl = rs_ioctl,
1938
        .throttle = rs_throttle,
1939
        .unthrottle = rs_unthrottle,
1940
        .set_termios = rs_set_termios,
1941
        .stop = rs_stop,
1942
        .start = rs_start,
1943
        .hangup = rs_hangup,
1944
        .break_ctl = rs_break,
1945
        .send_xchar = rs_send_xchar,
1946
        .wait_until_sent = rs_wait_until_sent,
1947
        .read_proc = rs_read_proc,
1948
        .tiocmget = rs_tiocmget,
1949
        .tiocmset = rs_tiocmset,
1950
};
1951
 
1952
/*
1953
 * The serial driver boot-time initialization code!
1954
 */
1955
static int __init rs_init(void)
1956
{
1957
        unsigned long flags;
1958
        struct serial_state * state;
1959
 
1960
        if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
1961
                return -ENODEV;
1962
 
1963
        serial_driver = alloc_tty_driver(1);
1964
        if (!serial_driver)
1965
                return -ENOMEM;
1966
 
1967
        /*
1968
         *  We request SERDAT and SERPER only, because the serial registers are
1969
         *  too spreaded over the custom register space
1970
         */
1971
        if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4, "amiserial [Paula]"))
1972
                return -EBUSY;
1973
 
1974
        IRQ_ports = NULL;
1975
 
1976
        show_serial_version();
1977
 
1978
        /* Initialize the tty_driver structure */
1979
 
1980
        serial_driver->owner = THIS_MODULE;
1981
        serial_driver->driver_name = "amiserial";
1982
        serial_driver->name = "ttyS";
1983
        serial_driver->major = TTY_MAJOR;
1984
        serial_driver->minor_start = 64;
1985
        serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1986
        serial_driver->subtype = SERIAL_TYPE_NORMAL;
1987
        serial_driver->init_termios = tty_std_termios;
1988
        serial_driver->init_termios.c_cflag =
1989
                B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1990
        serial_driver->flags = TTY_DRIVER_REAL_RAW;
1991
        tty_set_operations(serial_driver, &serial_ops);
1992
 
1993
        if (tty_register_driver(serial_driver))
1994
                panic("Couldn't register serial driver\n");
1995
 
1996
        state = rs_table;
1997
        state->magic = SSTATE_MAGIC;
1998
        state->port = (int)&custom.serdatr; /* Just to give it a value */
1999
        state->line = 0;
2000
        state->custom_divisor = 0;
2001
        state->close_delay = 5*HZ/10;
2002
        state->closing_wait = 30*HZ;
2003
        state->icount.cts = state->icount.dsr =
2004
          state->icount.rng = state->icount.dcd = 0;
2005
        state->icount.rx = state->icount.tx = 0;
2006
        state->icount.frame = state->icount.parity = 0;
2007
        state->icount.overrun = state->icount.brk = 0;
2008
 
2009
        printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2010
                       state->line);
2011
 
2012
        /* Hardware set up */
2013
 
2014
        state->baud_base = amiga_colorclock;
2015
        state->xmit_fifo_size = 1;
2016
 
2017
        local_irq_save(flags);
2018
 
2019
        /* set ISRs, and then disable the rx interrupts */
2020
        request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2021
        request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED, "serial RX", state);
2022
 
2023
        /* turn off Rx and Tx interrupts */
2024
        custom.intena = IF_RBF | IF_TBE;
2025
        mb();
2026
 
2027
        /* clear any pending interrupt */
2028
        custom.intreq = IF_RBF | IF_TBE;
2029
        mb();
2030
 
2031
        local_irq_restore(flags);
2032
 
2033
        /*
2034
         * set the appropriate directions for the modem control flags,
2035
         * and clear RTS and DTR
2036
         */
2037
        ciab.ddra |= (SER_DTR | SER_RTS);   /* outputs */
2038
        ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR);  /* inputs */
2039
 
2040
        return 0;
2041
}
2042
 
2043
static __exit void rs_exit(void)
2044
{
2045
        int error;
2046
        struct async_struct *info = rs_table[0].info;
2047
 
2048
        /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2049
        tasklet_kill(&info->tlet);
2050
        if ((error = tty_unregister_driver(serial_driver)))
2051
                printk("SERIAL: failed to unregister serial driver (%d)\n",
2052
                       error);
2053
        put_tty_driver(serial_driver);
2054
 
2055
        if (info) {
2056
          rs_table[0].info = NULL;
2057
          kfree(info);
2058
        }
2059
 
2060
        release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2061
}
2062
 
2063
module_init(rs_init)
2064
module_exit(rs_exit)
2065
 
2066
 
2067
/*
2068
 * ------------------------------------------------------------
2069
 * Serial console driver
2070
 * ------------------------------------------------------------
2071
 */
2072
#ifdef CONFIG_SERIAL_CONSOLE
2073
 
2074
static void amiga_serial_putc(char c)
2075
{
2076
        custom.serdat = (unsigned char)c | 0x100;
2077
        while (!(custom.serdatr & 0x2000))
2078
                barrier();
2079
}
2080
 
2081
/*
2082
 *      Print a string to the serial port trying not to disturb
2083
 *      any possible real use of the port...
2084
 *
2085
 *      The console must be locked when we get here.
2086
 */
2087
static void serial_console_write(struct console *co, const char *s,
2088
                                unsigned count)
2089
{
2090
        unsigned short intena = custom.intenar;
2091
 
2092
        custom.intena = IF_TBE;
2093
 
2094
        while (count--) {
2095
                if (*s == '\n')
2096
                        amiga_serial_putc('\r');
2097
                amiga_serial_putc(*s++);
2098
        }
2099
 
2100
        custom.intena = IF_SETCLR | (intena & IF_TBE);
2101
}
2102
 
2103
static struct tty_driver *serial_console_device(struct console *c, int *index)
2104
{
2105
        *index = 0;
2106
        return serial_driver;
2107
}
2108
 
2109
static struct console sercons = {
2110
        .name =         "ttyS",
2111
        .write =        serial_console_write,
2112
        .device =       serial_console_device,
2113
        .flags =        CON_PRINTBUFFER,
2114
        .index =        -1,
2115
};
2116
 
2117
/*
2118
 *      Register console.
2119
 */
2120
static int __init amiserial_console_init(void)
2121
{
2122
        register_console(&sercons);
2123
        return 0;
2124
}
2125
console_initcall(amiserial_console_init);
2126
#endif
2127
 
2128
MODULE_LICENSE("GPL");

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