1 /*
2 * linux/drivers/char/amiserial.c
3 *
4 * Serial driver for the amiga builtin port.
5 *
6 * This code was created by taking serial.c version 4.30 from kernel
7 * release 2.3.22, replacing all hardware related stuff with the
8 * corresponding amiga hardware actions, and removing all irrelevant
9 * code. As a consequence, it uses many of the constants and names
10 * associated with the registers and bits of 16550 compatible UARTS -
11 * but only to keep track of status, etc in the state variables. It
12 * was done this was to make it easier to keep the code in line with
13 * (non hardware specific) changes to serial.c.
14 *
15 * The port is registered with the tty driver as minor device 64, and
16 * therefore other ports should should only use 65 upwards.
17 *
18 * Richard Lucock 28/12/99
19 *
20 * Copyright (C) 1991, 1992 Linus Torvalds
21 * Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997,
22 * 1998, 1999 Theodore Ts'o
23 *
24 */
25
26 /*
27 * Serial driver configuration section. Here are the various options:
28 *
29 * SERIAL_PARANOIA_CHECK
30 * Check the magic number for the async_structure where
31 * ever possible.
32 */
33
34 #include <linux/delay.h>
35
36 #undef SERIAL_PARANOIA_CHECK
37 #define SERIAL_DO_RESTART
38
39 /* Set of debugging defines */
40
41 #undef SERIAL_DEBUG_INTR
42 #undef SERIAL_DEBUG_OPEN
43 #undef SERIAL_DEBUG_FLOW
44 #undef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
45
46 /* Sanity checks */
47
48 #if defined(MODULE) && defined(SERIAL_DEBUG_MCOUNT)
49 #define DBG_CNT(s) printk("(%s): [%x] refc=%d, serc=%d, ttyc=%d -> %s\n", \
50 tty->name, (info->flags), serial_driver->refcount,info->count,tty->count,s)
51 #else
52 #define DBG_CNT(s)
53 #endif
54
55 /*
56 * End of serial driver configuration section.
57 */
58
59 #include <linux/module.h>
60
61 #include <linux/types.h>
62 #include <linux/serial.h>
63 #include <linux/serialP.h>
64 #include <linux/serial_reg.h>
65 static char *serial_version = "4.30";
66
67 #include <linux/errno.h>
68 #include <linux/signal.h>
69 #include <linux/sched.h>
70 #include <linux/kernel.h>
71 #include <linux/timer.h>
72 #include <linux/interrupt.h>
73 #include <linux/tty.h>
74 #include <linux/tty_flip.h>
75 #include <linux/console.h>
76 #include <linux/major.h>
77 #include <linux/string.h>
78 #include <linux/fcntl.h>
79 #include <linux/ptrace.h>
80 #include <linux/ioport.h>
81 #include <linux/mm.h>
82 #include <linux/slab.h>
83 #include <linux/init.h>
84 #include <linux/bitops.h>
85
86 #include <asm/setup.h>
87
88 #include <asm/system.h>
89
90 #include <asm/irq.h>
91
92 #include <asm/amigahw.h>
93 #include <asm/amigaints.h>
94
95 #define custom amiga_custom
96 static char *serial_name = "Amiga-builtin serial driver";
97
98 static struct tty_driver *serial_driver;
99
100 /* number of characters left in xmit buffer before we ask for more */
101 #define WAKEUP_CHARS 256
102
103 static struct async_struct *IRQ_ports;
104
105 static unsigned char current_ctl_bits;
106
107 static void change_speed(struct async_struct *info, struct ktermios *old);
108 static void rs_wait_until_sent(struct tty_struct *tty, int timeout);
109
110
111 static struct serial_state rs_table[1];
112
113 #define NR_PORTS ARRAY_SIZE(rs_table)
114
115 #include <asm/uaccess.h>
116
117 #define serial_isroot() (capable(CAP_SYS_ADMIN))
118
119
serial_paranoia_check(struct async_struct * info,char * name,const char * routine)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
rtsdtr_ctrl(int bits)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 */
rs_stop(struct tty_struct * tty)171 static void rs_stop(struct tty_struct *tty)
172 {
173 struct async_struct *info = 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
rs_start(struct tty_struct * tty)191 static void rs_start(struct tty_struct *tty)
192 {
193 struct async_struct *info = 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 */
rs_sched_event(struct async_struct * info,int event)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
receive_chars(struct async_struct * info)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
transmit_chars(struct async_struct * info)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
check_modem_status(struct async_struct * info)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
ser_vbl_int(int irq,void * data)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
ser_rx_int(int irq,void * dev_id)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
ser_tx_int(int irq,void * dev_id)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
do_softint(unsigned long private_)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
startup(struct async_struct * info)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 */
shutdown(struct async_struct * info)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 */
change_speed(struct async_struct * info,struct ktermios * old_termios)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
rs_put_char(struct tty_struct * tty,unsigned char ch)835 static int rs_put_char(struct tty_struct *tty, unsigned char ch)
836 {
837 struct async_struct *info;
838 unsigned long flags;
839
840 info = tty->driver_data;
841
842 if (serial_paranoia_check(info, tty->name, "rs_put_char"))
843 return 0;
844
845 if (!info->xmit.buf)
846 return 0;
847
848 local_irq_save(flags);
849 if (CIRC_SPACE(info->xmit.head,
850 info->xmit.tail,
851 SERIAL_XMIT_SIZE) == 0) {
852 local_irq_restore(flags);
853 return 0;
854 }
855
856 info->xmit.buf[info->xmit.head++] = ch;
857 info->xmit.head &= SERIAL_XMIT_SIZE-1;
858 local_irq_restore(flags);
859 return 1;
860 }
861
rs_flush_chars(struct tty_struct * tty)862 static void rs_flush_chars(struct tty_struct *tty)
863 {
864 struct async_struct *info = tty->driver_data;
865 unsigned long flags;
866
867 if (serial_paranoia_check(info, tty->name, "rs_flush_chars"))
868 return;
869
870 if (info->xmit.head == info->xmit.tail
871 || tty->stopped
872 || tty->hw_stopped
873 || !info->xmit.buf)
874 return;
875
876 local_irq_save(flags);
877 info->IER |= UART_IER_THRI;
878 custom.intena = IF_SETCLR | IF_TBE;
879 mb();
880 /* set a pending Tx Interrupt, transmitter should restart now */
881 custom.intreq = IF_SETCLR | IF_TBE;
882 mb();
883 local_irq_restore(flags);
884 }
885
rs_write(struct tty_struct * tty,const unsigned char * buf,int count)886 static int rs_write(struct tty_struct * tty, const unsigned char *buf, int count)
887 {
888 int c, ret = 0;
889 struct async_struct *info;
890 unsigned long flags;
891
892 info = tty->driver_data;
893
894 if (serial_paranoia_check(info, tty->name, "rs_write"))
895 return 0;
896
897 if (!info->xmit.buf)
898 return 0;
899
900 local_irq_save(flags);
901 while (1) {
902 c = CIRC_SPACE_TO_END(info->xmit.head,
903 info->xmit.tail,
904 SERIAL_XMIT_SIZE);
905 if (count < c)
906 c = count;
907 if (c <= 0) {
908 break;
909 }
910 memcpy(info->xmit.buf + info->xmit.head, buf, c);
911 info->xmit.head = ((info->xmit.head + c) &
912 (SERIAL_XMIT_SIZE-1));
913 buf += c;
914 count -= c;
915 ret += c;
916 }
917 local_irq_restore(flags);
918
919 if (info->xmit.head != info->xmit.tail
920 && !tty->stopped
921 && !tty->hw_stopped
922 && !(info->IER & UART_IER_THRI)) {
923 info->IER |= UART_IER_THRI;
924 local_irq_disable();
925 custom.intena = IF_SETCLR | IF_TBE;
926 mb();
927 /* set a pending Tx Interrupt, transmitter should restart now */
928 custom.intreq = IF_SETCLR | IF_TBE;
929 mb();
930 local_irq_restore(flags);
931 }
932 return ret;
933 }
934
rs_write_room(struct tty_struct * tty)935 static int rs_write_room(struct tty_struct *tty)
936 {
937 struct async_struct *info = tty->driver_data;
938
939 if (serial_paranoia_check(info, tty->name, "rs_write_room"))
940 return 0;
941 return CIRC_SPACE(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
942 }
943
rs_chars_in_buffer(struct tty_struct * tty)944 static int rs_chars_in_buffer(struct tty_struct *tty)
945 {
946 struct async_struct *info = tty->driver_data;
947
948 if (serial_paranoia_check(info, tty->name, "rs_chars_in_buffer"))
949 return 0;
950 return CIRC_CNT(info->xmit.head, info->xmit.tail, SERIAL_XMIT_SIZE);
951 }
952
rs_flush_buffer(struct tty_struct * tty)953 static void rs_flush_buffer(struct tty_struct *tty)
954 {
955 struct async_struct *info = tty->driver_data;
956 unsigned long flags;
957
958 if (serial_paranoia_check(info, tty->name, "rs_flush_buffer"))
959 return;
960 local_irq_save(flags);
961 info->xmit.head = info->xmit.tail = 0;
962 local_irq_restore(flags);
963 tty_wakeup(tty);
964 }
965
966 /*
967 * This function is used to send a high-priority XON/XOFF character to
968 * the device
969 */
rs_send_xchar(struct tty_struct * tty,char ch)970 static void rs_send_xchar(struct tty_struct *tty, char ch)
971 {
972 struct async_struct *info = tty->driver_data;
973 unsigned long flags;
974
975 if (serial_paranoia_check(info, tty->name, "rs_send_char"))
976 return;
977
978 info->x_char = ch;
979 if (ch) {
980 /* Make sure transmit interrupts are on */
981
982 /* Check this ! */
983 local_irq_save(flags);
984 if(!(custom.intenar & IF_TBE)) {
985 custom.intena = IF_SETCLR | IF_TBE;
986 mb();
987 /* set a pending Tx Interrupt, transmitter should restart now */
988 custom.intreq = IF_SETCLR | IF_TBE;
989 mb();
990 }
991 local_irq_restore(flags);
992
993 info->IER |= UART_IER_THRI;
994 }
995 }
996
997 /*
998 * ------------------------------------------------------------
999 * rs_throttle()
1000 *
1001 * This routine is called by the upper-layer tty layer to signal that
1002 * incoming characters should be throttled.
1003 * ------------------------------------------------------------
1004 */
rs_throttle(struct tty_struct * tty)1005 static void rs_throttle(struct tty_struct * tty)
1006 {
1007 struct async_struct *info = tty->driver_data;
1008 unsigned long flags;
1009 #ifdef SERIAL_DEBUG_THROTTLE
1010 char buf[64];
1011
1012 printk("throttle %s: %d....\n", tty_name(tty, buf),
1013 tty->ldisc.chars_in_buffer(tty));
1014 #endif
1015
1016 if (serial_paranoia_check(info, tty->name, "rs_throttle"))
1017 return;
1018
1019 if (I_IXOFF(tty))
1020 rs_send_xchar(tty, STOP_CHAR(tty));
1021
1022 if (tty->termios->c_cflag & CRTSCTS)
1023 info->MCR &= ~SER_RTS;
1024
1025 local_irq_save(flags);
1026 rtsdtr_ctrl(info->MCR);
1027 local_irq_restore(flags);
1028 }
1029
rs_unthrottle(struct tty_struct * tty)1030 static void rs_unthrottle(struct tty_struct * tty)
1031 {
1032 struct async_struct *info = tty->driver_data;
1033 unsigned long flags;
1034 #ifdef SERIAL_DEBUG_THROTTLE
1035 char buf[64];
1036
1037 printk("unthrottle %s: %d....\n", tty_name(tty, buf),
1038 tty->ldisc.chars_in_buffer(tty));
1039 #endif
1040
1041 if (serial_paranoia_check(info, tty->name, "rs_unthrottle"))
1042 return;
1043
1044 if (I_IXOFF(tty)) {
1045 if (info->x_char)
1046 info->x_char = 0;
1047 else
1048 rs_send_xchar(tty, START_CHAR(tty));
1049 }
1050 if (tty->termios->c_cflag & CRTSCTS)
1051 info->MCR |= SER_RTS;
1052 local_irq_save(flags);
1053 rtsdtr_ctrl(info->MCR);
1054 local_irq_restore(flags);
1055 }
1056
1057 /*
1058 * ------------------------------------------------------------
1059 * rs_ioctl() and friends
1060 * ------------------------------------------------------------
1061 */
1062
get_serial_info(struct async_struct * info,struct serial_struct __user * retinfo)1063 static int get_serial_info(struct async_struct * info,
1064 struct serial_struct __user * retinfo)
1065 {
1066 struct serial_struct tmp;
1067 struct serial_state *state = info->state;
1068
1069 if (!retinfo)
1070 return -EFAULT;
1071 memset(&tmp, 0, sizeof(tmp));
1072 lock_kernel();
1073 tmp.type = state->type;
1074 tmp.line = state->line;
1075 tmp.port = state->port;
1076 tmp.irq = state->irq;
1077 tmp.flags = state->flags;
1078 tmp.xmit_fifo_size = state->xmit_fifo_size;
1079 tmp.baud_base = state->baud_base;
1080 tmp.close_delay = state->close_delay;
1081 tmp.closing_wait = state->closing_wait;
1082 tmp.custom_divisor = state->custom_divisor;
1083 unlock_kernel();
1084 if (copy_to_user(retinfo,&tmp,sizeof(*retinfo)))
1085 return -EFAULT;
1086 return 0;
1087 }
1088
set_serial_info(struct async_struct * info,struct serial_struct __user * new_info)1089 static int set_serial_info(struct async_struct * info,
1090 struct serial_struct __user * new_info)
1091 {
1092 struct serial_struct new_serial;
1093 struct serial_state old_state, *state;
1094 unsigned int change_irq,change_port;
1095 int retval = 0;
1096
1097 if (copy_from_user(&new_serial,new_info,sizeof(new_serial)))
1098 return -EFAULT;
1099
1100 lock_kernel();
1101 state = info->state;
1102 old_state = *state;
1103
1104 change_irq = new_serial.irq != state->irq;
1105 change_port = (new_serial.port != state->port);
1106 if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) {
1107 unlock_kernel();
1108 return -EINVAL;
1109 }
1110
1111 if (!serial_isroot()) {
1112 if ((new_serial.baud_base != state->baud_base) ||
1113 (new_serial.close_delay != state->close_delay) ||
1114 (new_serial.xmit_fifo_size != state->xmit_fifo_size) ||
1115 ((new_serial.flags & ~ASYNC_USR_MASK) !=
1116 (state->flags & ~ASYNC_USR_MASK)))
1117 return -EPERM;
1118 state->flags = ((state->flags & ~ASYNC_USR_MASK) |
1119 (new_serial.flags & ASYNC_USR_MASK));
1120 info->flags = ((info->flags & ~ASYNC_USR_MASK) |
1121 (new_serial.flags & ASYNC_USR_MASK));
1122 state->custom_divisor = new_serial.custom_divisor;
1123 goto check_and_exit;
1124 }
1125
1126 if (new_serial.baud_base < 9600) {
1127 unlock_kernel();
1128 return -EINVAL;
1129 }
1130
1131 /*
1132 * OK, past this point, all the error checking has been done.
1133 * At this point, we start making changes.....
1134 */
1135
1136 state->baud_base = new_serial.baud_base;
1137 state->flags = ((state->flags & ~ASYNC_FLAGS) |
1138 (new_serial.flags & ASYNC_FLAGS));
1139 info->flags = ((state->flags & ~ASYNC_INTERNAL_FLAGS) |
1140 (info->flags & ASYNC_INTERNAL_FLAGS));
1141 state->custom_divisor = new_serial.custom_divisor;
1142 state->close_delay = new_serial.close_delay * HZ/100;
1143 state->closing_wait = new_serial.closing_wait * HZ/100;
1144 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1145
1146 check_and_exit:
1147 if (info->flags & ASYNC_INITIALIZED) {
1148 if (((old_state.flags & ASYNC_SPD_MASK) !=
1149 (state->flags & ASYNC_SPD_MASK)) ||
1150 (old_state.custom_divisor != state->custom_divisor)) {
1151 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI)
1152 info->tty->alt_speed = 57600;
1153 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI)
1154 info->tty->alt_speed = 115200;
1155 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_SHI)
1156 info->tty->alt_speed = 230400;
1157 if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_WARP)
1158 info->tty->alt_speed = 460800;
1159 change_speed(info, NULL);
1160 }
1161 } else
1162 retval = startup(info);
1163 unlock_kernel();
1164 return retval;
1165 }
1166
1167
1168 /*
1169 * get_lsr_info - get line status register info
1170 *
1171 * Purpose: Let user call ioctl() to get info when the UART physically
1172 * is emptied. On bus types like RS485, the transmitter must
1173 * release the bus after transmitting. This must be done when
1174 * the transmit shift register is empty, not be done when the
1175 * transmit holding register is empty. This functionality
1176 * allows an RS485 driver to be written in user space.
1177 */
get_lsr_info(struct async_struct * info,unsigned int __user * value)1178 static int get_lsr_info(struct async_struct * info, unsigned int __user *value)
1179 {
1180 unsigned char status;
1181 unsigned int result;
1182 unsigned long flags;
1183
1184 local_irq_save(flags);
1185 status = custom.serdatr;
1186 mb();
1187 local_irq_restore(flags);
1188 result = ((status & SDR_TSRE) ? TIOCSER_TEMT : 0);
1189 if (copy_to_user(value, &result, sizeof(int)))
1190 return -EFAULT;
1191 return 0;
1192 }
1193
1194
rs_tiocmget(struct tty_struct * tty,struct file * file)1195 static int rs_tiocmget(struct tty_struct *tty, struct file *file)
1196 {
1197 struct async_struct * info = tty->driver_data;
1198 unsigned char control, status;
1199 unsigned long flags;
1200
1201 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1202 return -ENODEV;
1203 if (tty->flags & (1 << TTY_IO_ERROR))
1204 return -EIO;
1205
1206 control = info->MCR;
1207 local_irq_save(flags);
1208 status = ciab.pra;
1209 local_irq_restore(flags);
1210 return ((control & SER_RTS) ? TIOCM_RTS : 0)
1211 | ((control & SER_DTR) ? TIOCM_DTR : 0)
1212 | (!(status & SER_DCD) ? TIOCM_CAR : 0)
1213 | (!(status & SER_DSR) ? TIOCM_DSR : 0)
1214 | (!(status & SER_CTS) ? TIOCM_CTS : 0);
1215 }
1216
rs_tiocmset(struct tty_struct * tty,struct file * file,unsigned int set,unsigned int clear)1217 static int rs_tiocmset(struct tty_struct *tty, struct file *file,
1218 unsigned int set, unsigned int clear)
1219 {
1220 struct async_struct * info = tty->driver_data;
1221 unsigned long flags;
1222
1223 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1224 return -ENODEV;
1225 if (tty->flags & (1 << TTY_IO_ERROR))
1226 return -EIO;
1227
1228 local_irq_save(flags);
1229 if (set & TIOCM_RTS)
1230 info->MCR |= SER_RTS;
1231 if (set & TIOCM_DTR)
1232 info->MCR |= SER_DTR;
1233 if (clear & TIOCM_RTS)
1234 info->MCR &= ~SER_RTS;
1235 if (clear & TIOCM_DTR)
1236 info->MCR &= ~SER_DTR;
1237 rtsdtr_ctrl(info->MCR);
1238 local_irq_restore(flags);
1239 return 0;
1240 }
1241
1242 /*
1243 * rs_break() --- routine which turns the break handling on or off
1244 */
rs_break(struct tty_struct * tty,int break_state)1245 static int rs_break(struct tty_struct *tty, int break_state)
1246 {
1247 struct async_struct * info = tty->driver_data;
1248 unsigned long flags;
1249
1250 if (serial_paranoia_check(info, tty->name, "rs_break"))
1251 return -EINVAL;
1252
1253 local_irq_save(flags);
1254 if (break_state == -1)
1255 custom.adkcon = AC_SETCLR | AC_UARTBRK;
1256 else
1257 custom.adkcon = AC_UARTBRK;
1258 mb();
1259 local_irq_restore(flags);
1260 return 0;
1261 }
1262
1263
rs_ioctl(struct tty_struct * tty,struct file * file,unsigned int cmd,unsigned long arg)1264 static int rs_ioctl(struct tty_struct *tty, struct file * file,
1265 unsigned int cmd, unsigned long arg)
1266 {
1267 struct async_struct * info = tty->driver_data;
1268 struct async_icount cprev, cnow; /* kernel counter temps */
1269 struct serial_icounter_struct icount;
1270 void __user *argp = (void __user *)arg;
1271 unsigned long flags;
1272
1273 if (serial_paranoia_check(info, tty->name, "rs_ioctl"))
1274 return -ENODEV;
1275
1276 if ((cmd != TIOCGSERIAL) && (cmd != TIOCSSERIAL) &&
1277 (cmd != TIOCSERCONFIG) && (cmd != TIOCSERGSTRUCT) &&
1278 (cmd != TIOCMIWAIT) && (cmd != TIOCGICOUNT)) {
1279 if (tty->flags & (1 << TTY_IO_ERROR))
1280 return -EIO;
1281 }
1282
1283 switch (cmd) {
1284 case TIOCGSERIAL:
1285 return get_serial_info(info, argp);
1286 case TIOCSSERIAL:
1287 return set_serial_info(info, argp);
1288 case TIOCSERCONFIG:
1289 return 0;
1290
1291 case TIOCSERGETLSR: /* Get line status register */
1292 return get_lsr_info(info, argp);
1293
1294 case TIOCSERGSTRUCT:
1295 if (copy_to_user(argp,
1296 info, sizeof(struct async_struct)))
1297 return -EFAULT;
1298 return 0;
1299
1300 /*
1301 * Wait for any of the 4 modem inputs (DCD,RI,DSR,CTS) to change
1302 * - mask passed in arg for lines of interest
1303 * (use |'ed TIOCM_RNG/DSR/CD/CTS for masking)
1304 * Caller should use TIOCGICOUNT to see which one it was
1305 */
1306 case TIOCMIWAIT:
1307 local_irq_save(flags);
1308 /* note the counters on entry */
1309 cprev = info->state->icount;
1310 local_irq_restore(flags);
1311 while (1) {
1312 interruptible_sleep_on(&info->delta_msr_wait);
1313 /* see if a signal did it */
1314 if (signal_pending(current))
1315 return -ERESTARTSYS;
1316 local_irq_save(flags);
1317 cnow = info->state->icount; /* atomic copy */
1318 local_irq_restore(flags);
1319 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1320 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1321 return -EIO; /* no change => error */
1322 if ( ((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1323 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1324 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
1325 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1326 return 0;
1327 }
1328 cprev = cnow;
1329 }
1330 /* NOTREACHED */
1331
1332 /*
1333 * Get counter of input serial line interrupts (DCD,RI,DSR,CTS)
1334 * Return: write counters to the user passed counter struct
1335 * NB: both 1->0 and 0->1 transitions are counted except for
1336 * RI where only 0->1 is counted.
1337 */
1338 case TIOCGICOUNT:
1339 local_irq_save(flags);
1340 cnow = info->state->icount;
1341 local_irq_restore(flags);
1342 icount.cts = cnow.cts;
1343 icount.dsr = cnow.dsr;
1344 icount.rng = cnow.rng;
1345 icount.dcd = cnow.dcd;
1346 icount.rx = cnow.rx;
1347 icount.tx = cnow.tx;
1348 icount.frame = cnow.frame;
1349 icount.overrun = cnow.overrun;
1350 icount.parity = cnow.parity;
1351 icount.brk = cnow.brk;
1352 icount.buf_overrun = cnow.buf_overrun;
1353
1354 if (copy_to_user(argp, &icount, sizeof(icount)))
1355 return -EFAULT;
1356 return 0;
1357 case TIOCSERGWILD:
1358 case TIOCSERSWILD:
1359 /* "setserial -W" is called in Debian boot */
1360 printk ("TIOCSER?WILD ioctl obsolete, ignored.\n");
1361 return 0;
1362
1363 default:
1364 return -ENOIOCTLCMD;
1365 }
1366 return 0;
1367 }
1368
rs_set_termios(struct tty_struct * tty,struct ktermios * old_termios)1369 static void rs_set_termios(struct tty_struct *tty, struct ktermios *old_termios)
1370 {
1371 struct async_struct *info = tty->driver_data;
1372 unsigned long flags;
1373 unsigned int cflag = tty->termios->c_cflag;
1374
1375 change_speed(info, old_termios);
1376
1377 /* Handle transition to B0 status */
1378 if ((old_termios->c_cflag & CBAUD) &&
1379 !(cflag & CBAUD)) {
1380 info->MCR &= ~(SER_DTR|SER_RTS);
1381 local_irq_save(flags);
1382 rtsdtr_ctrl(info->MCR);
1383 local_irq_restore(flags);
1384 }
1385
1386 /* Handle transition away from B0 status */
1387 if (!(old_termios->c_cflag & CBAUD) &&
1388 (cflag & CBAUD)) {
1389 info->MCR |= SER_DTR;
1390 if (!(tty->termios->c_cflag & CRTSCTS) ||
1391 !test_bit(TTY_THROTTLED, &tty->flags)) {
1392 info->MCR |= SER_RTS;
1393 }
1394 local_irq_save(flags);
1395 rtsdtr_ctrl(info->MCR);
1396 local_irq_restore(flags);
1397 }
1398
1399 /* Handle turning off CRTSCTS */
1400 if ((old_termios->c_cflag & CRTSCTS) &&
1401 !(tty->termios->c_cflag & CRTSCTS)) {
1402 tty->hw_stopped = 0;
1403 rs_start(tty);
1404 }
1405
1406 #if 0
1407 /*
1408 * No need to wake up processes in open wait, since they
1409 * sample the CLOCAL flag once, and don't recheck it.
1410 * XXX It's not clear whether the current behavior is correct
1411 * or not. Hence, this may change.....
1412 */
1413 if (!(old_termios->c_cflag & CLOCAL) &&
1414 (tty->termios->c_cflag & CLOCAL))
1415 wake_up_interruptible(&info->open_wait);
1416 #endif
1417 }
1418
1419 /*
1420 * ------------------------------------------------------------
1421 * rs_close()
1422 *
1423 * This routine is called when the serial port gets closed. First, we
1424 * wait for the last remaining data to be sent. Then, we unlink its
1425 * async structure from the interrupt chain if necessary, and we free
1426 * that IRQ if nothing is left in the chain.
1427 * ------------------------------------------------------------
1428 */
rs_close(struct tty_struct * tty,struct file * filp)1429 static void rs_close(struct tty_struct *tty, struct file * filp)
1430 {
1431 struct async_struct * info = tty->driver_data;
1432 struct serial_state *state;
1433 unsigned long flags;
1434
1435 if (!info || serial_paranoia_check(info, tty->name, "rs_close"))
1436 return;
1437
1438 state = info->state;
1439
1440 local_irq_save(flags);
1441
1442 if (tty_hung_up_p(filp)) {
1443 DBG_CNT("before DEC-hung");
1444 local_irq_restore(flags);
1445 return;
1446 }
1447
1448 #ifdef SERIAL_DEBUG_OPEN
1449 printk("rs_close ttys%d, count = %d\n", info->line, state->count);
1450 #endif
1451 if ((tty->count == 1) && (state->count != 1)) {
1452 /*
1453 * Uh, oh. tty->count is 1, which means that the tty
1454 * structure will be freed. state->count should always
1455 * be one in these conditions. If it's greater than
1456 * one, we've got real problems, since it means the
1457 * serial port won't be shutdown.
1458 */
1459 printk("rs_close: bad serial port count; tty->count is 1, "
1460 "state->count is %d\n", state->count);
1461 state->count = 1;
1462 }
1463 if (--state->count < 0) {
1464 printk("rs_close: bad serial port count for ttys%d: %d\n",
1465 info->line, state->count);
1466 state->count = 0;
1467 }
1468 if (state->count) {
1469 DBG_CNT("before DEC-2");
1470 local_irq_restore(flags);
1471 return;
1472 }
1473 info->flags |= ASYNC_CLOSING;
1474 /*
1475 * Now we wait for the transmit buffer to clear; and we notify
1476 * the line discipline to only process XON/XOFF characters.
1477 */
1478 tty->closing = 1;
1479 if (info->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1480 tty_wait_until_sent(tty, info->closing_wait);
1481 /*
1482 * At this point we stop accepting input. To do this, we
1483 * disable the receive line status interrupts, and tell the
1484 * interrupt driver to stop checking the data ready bit in the
1485 * line status register.
1486 */
1487 info->read_status_mask &= ~UART_LSR_DR;
1488 if (info->flags & ASYNC_INITIALIZED) {
1489 /* disable receive interrupts */
1490 custom.intena = IF_RBF;
1491 mb();
1492 /* clear any pending receive interrupt */
1493 custom.intreq = IF_RBF;
1494 mb();
1495
1496 /*
1497 * Before we drop DTR, make sure the UART transmitter
1498 * has completely drained; this is especially
1499 * important if there is a transmit FIFO!
1500 */
1501 rs_wait_until_sent(tty, info->timeout);
1502 }
1503 shutdown(info);
1504 rs_flush_buffer(tty);
1505
1506 tty_ldisc_flush(tty);
1507 tty->closing = 0;
1508 info->event = 0;
1509 info->tty = NULL;
1510 if (info->blocked_open) {
1511 if (info->close_delay) {
1512 msleep_interruptible(jiffies_to_msecs(info->close_delay));
1513 }
1514 wake_up_interruptible(&info->open_wait);
1515 }
1516 info->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1517 wake_up_interruptible(&info->close_wait);
1518 local_irq_restore(flags);
1519 }
1520
1521 /*
1522 * rs_wait_until_sent() --- wait until the transmitter is empty
1523 */
rs_wait_until_sent(struct tty_struct * tty,int timeout)1524 static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
1525 {
1526 struct async_struct * info = tty->driver_data;
1527 unsigned long orig_jiffies, char_time;
1528 int lsr;
1529
1530 if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
1531 return;
1532
1533 if (info->xmit_fifo_size == 0)
1534 return; /* Just in case.... */
1535
1536 orig_jiffies = jiffies;
1537
1538 lock_kernel();
1539 /*
1540 * Set the check interval to be 1/5 of the estimated time to
1541 * send a single character, and make it at least 1. The check
1542 * interval should also be less than the timeout.
1543 *
1544 * Note: we have to use pretty tight timings here to satisfy
1545 * the NIST-PCTS.
1546 */
1547 char_time = (info->timeout - HZ/50) / info->xmit_fifo_size;
1548 char_time = char_time / 5;
1549 if (char_time == 0)
1550 char_time = 1;
1551 if (timeout)
1552 char_time = min_t(unsigned long, char_time, timeout);
1553 /*
1554 * If the transmitter hasn't cleared in twice the approximate
1555 * amount of time to send the entire FIFO, it probably won't
1556 * ever clear. This assumes the UART isn't doing flow
1557 * control, which is currently the case. Hence, if it ever
1558 * takes longer than info->timeout, this is probably due to a
1559 * UART bug of some kind. So, we clamp the timeout parameter at
1560 * 2*info->timeout.
1561 */
1562 if (!timeout || timeout > 2*info->timeout)
1563 timeout = 2*info->timeout;
1564 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1565 printk("In rs_wait_until_sent(%d) check=%lu...", timeout, char_time);
1566 printk("jiff=%lu...", jiffies);
1567 #endif
1568 while(!((lsr = custom.serdatr) & SDR_TSRE)) {
1569 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1570 printk("serdatr = %d (jiff=%lu)...", lsr, jiffies);
1571 #endif
1572 msleep_interruptible(jiffies_to_msecs(char_time));
1573 if (signal_pending(current))
1574 break;
1575 if (timeout && time_after(jiffies, orig_jiffies + timeout))
1576 break;
1577 }
1578 __set_current_state(TASK_RUNNING);
1579 unlock_kernel();
1580 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
1581 printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
1582 #endif
1583 }
1584
1585 /*
1586 * rs_hangup() --- called by tty_hangup() when a hangup is signaled.
1587 */
rs_hangup(struct tty_struct * tty)1588 static void rs_hangup(struct tty_struct *tty)
1589 {
1590 struct async_struct * info = tty->driver_data;
1591 struct serial_state *state = info->state;
1592
1593 if (serial_paranoia_check(info, tty->name, "rs_hangup"))
1594 return;
1595
1596 state = info->state;
1597
1598 rs_flush_buffer(tty);
1599 shutdown(info);
1600 info->event = 0;
1601 state->count = 0;
1602 info->flags &= ~ASYNC_NORMAL_ACTIVE;
1603 info->tty = NULL;
1604 wake_up_interruptible(&info->open_wait);
1605 }
1606
1607 /*
1608 * ------------------------------------------------------------
1609 * rs_open() and friends
1610 * ------------------------------------------------------------
1611 */
block_til_ready(struct tty_struct * tty,struct file * filp,struct async_struct * info)1612 static int block_til_ready(struct tty_struct *tty, struct file * filp,
1613 struct async_struct *info)
1614 {
1615 #ifdef DECLARE_WAITQUEUE
1616 DECLARE_WAITQUEUE(wait, current);
1617 #else
1618 struct wait_queue wait = { current, NULL };
1619 #endif
1620 struct serial_state *state = info->state;
1621 int retval;
1622 int do_clocal = 0, extra_count = 0;
1623 unsigned long flags;
1624
1625 /*
1626 * If the device is in the middle of being closed, then block
1627 * until it's done, and then try again.
1628 */
1629 if (tty_hung_up_p(filp) ||
1630 (info->flags & ASYNC_CLOSING)) {
1631 if (info->flags & ASYNC_CLOSING)
1632 interruptible_sleep_on(&info->close_wait);
1633 #ifdef SERIAL_DO_RESTART
1634 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1635 -EAGAIN : -ERESTARTSYS);
1636 #else
1637 return -EAGAIN;
1638 #endif
1639 }
1640
1641 /*
1642 * If non-blocking mode is set, or the port is not enabled,
1643 * then make the check up front and then exit.
1644 */
1645 if ((filp->f_flags & O_NONBLOCK) ||
1646 (tty->flags & (1 << TTY_IO_ERROR))) {
1647 info->flags |= ASYNC_NORMAL_ACTIVE;
1648 return 0;
1649 }
1650
1651 if (tty->termios->c_cflag & CLOCAL)
1652 do_clocal = 1;
1653
1654 /*
1655 * Block waiting for the carrier detect and the line to become
1656 * free (i.e., not in use by the callout). While we are in
1657 * this loop, state->count is dropped by one, so that
1658 * rs_close() knows when to free things. We restore it upon
1659 * exit, either normal or abnormal.
1660 */
1661 retval = 0;
1662 add_wait_queue(&info->open_wait, &wait);
1663 #ifdef SERIAL_DEBUG_OPEN
1664 printk("block_til_ready before block: ttys%d, count = %d\n",
1665 state->line, state->count);
1666 #endif
1667 local_irq_save(flags);
1668 if (!tty_hung_up_p(filp)) {
1669 extra_count = 1;
1670 state->count--;
1671 }
1672 local_irq_restore(flags);
1673 info->blocked_open++;
1674 while (1) {
1675 local_irq_save(flags);
1676 if (tty->termios->c_cflag & CBAUD)
1677 rtsdtr_ctrl(SER_DTR|SER_RTS);
1678 local_irq_restore(flags);
1679 set_current_state(TASK_INTERRUPTIBLE);
1680 if (tty_hung_up_p(filp) ||
1681 !(info->flags & ASYNC_INITIALIZED)) {
1682 #ifdef SERIAL_DO_RESTART
1683 if (info->flags & ASYNC_HUP_NOTIFY)
1684 retval = -EAGAIN;
1685 else
1686 retval = -ERESTARTSYS;
1687 #else
1688 retval = -EAGAIN;
1689 #endif
1690 break;
1691 }
1692 if (!(info->flags & ASYNC_CLOSING) &&
1693 (do_clocal || (!(ciab.pra & SER_DCD)) ))
1694 break;
1695 if (signal_pending(current)) {
1696 retval = -ERESTARTSYS;
1697 break;
1698 }
1699 #ifdef SERIAL_DEBUG_OPEN
1700 printk("block_til_ready blocking: ttys%d, count = %d\n",
1701 info->line, state->count);
1702 #endif
1703 schedule();
1704 }
1705 __set_current_state(TASK_RUNNING);
1706 remove_wait_queue(&info->open_wait, &wait);
1707 if (extra_count)
1708 state->count++;
1709 info->blocked_open--;
1710 #ifdef SERIAL_DEBUG_OPEN
1711 printk("block_til_ready after blocking: ttys%d, count = %d\n",
1712 info->line, state->count);
1713 #endif
1714 if (retval)
1715 return retval;
1716 info->flags |= ASYNC_NORMAL_ACTIVE;
1717 return 0;
1718 }
1719
get_async_struct(int line,struct async_struct ** ret_info)1720 static int get_async_struct(int line, struct async_struct **ret_info)
1721 {
1722 struct async_struct *info;
1723 struct serial_state *sstate;
1724
1725 sstate = rs_table + line;
1726 sstate->count++;
1727 if (sstate->info) {
1728 *ret_info = sstate->info;
1729 return 0;
1730 }
1731 info = kzalloc(sizeof(struct async_struct), GFP_KERNEL);
1732 if (!info) {
1733 sstate->count--;
1734 return -ENOMEM;
1735 }
1736 #ifdef DECLARE_WAITQUEUE
1737 init_waitqueue_head(&info->open_wait);
1738 init_waitqueue_head(&info->close_wait);
1739 init_waitqueue_head(&info->delta_msr_wait);
1740 #endif
1741 info->magic = SERIAL_MAGIC;
1742 info->port = sstate->port;
1743 info->flags = sstate->flags;
1744 info->xmit_fifo_size = sstate->xmit_fifo_size;
1745 info->line = line;
1746 tasklet_init(&info->tlet, do_softint, (unsigned long)info);
1747 info->state = sstate;
1748 if (sstate->info) {
1749 kfree(info);
1750 *ret_info = sstate->info;
1751 return 0;
1752 }
1753 *ret_info = sstate->info = info;
1754 return 0;
1755 }
1756
1757 /*
1758 * This routine is called whenever a serial port is opened. It
1759 * enables interrupts for a serial port, linking in its async structure into
1760 * the IRQ chain. It also performs the serial-specific
1761 * initialization for the tty structure.
1762 */
rs_open(struct tty_struct * tty,struct file * filp)1763 static int rs_open(struct tty_struct *tty, struct file * filp)
1764 {
1765 struct async_struct *info;
1766 int retval, line;
1767
1768 line = tty->index;
1769 if ((line < 0) || (line >= NR_PORTS)) {
1770 return -ENODEV;
1771 }
1772 retval = get_async_struct(line, &info);
1773 if (retval) {
1774 return retval;
1775 }
1776 tty->driver_data = info;
1777 info->tty = tty;
1778 if (serial_paranoia_check(info, tty->name, "rs_open"))
1779 return -ENODEV;
1780
1781 #ifdef SERIAL_DEBUG_OPEN
1782 printk("rs_open %s, count = %d\n", tty->name, info->state->count);
1783 #endif
1784 info->tty->low_latency = (info->flags & ASYNC_LOW_LATENCY) ? 1 : 0;
1785
1786 /*
1787 * If the port is the middle of closing, bail out now
1788 */
1789 if (tty_hung_up_p(filp) ||
1790 (info->flags & ASYNC_CLOSING)) {
1791 if (info->flags & ASYNC_CLOSING)
1792 interruptible_sleep_on(&info->close_wait);
1793 #ifdef SERIAL_DO_RESTART
1794 return ((info->flags & ASYNC_HUP_NOTIFY) ?
1795 -EAGAIN : -ERESTARTSYS);
1796 #else
1797 return -EAGAIN;
1798 #endif
1799 }
1800
1801 /*
1802 * Start up serial port
1803 */
1804 retval = startup(info);
1805 if (retval) {
1806 return retval;
1807 }
1808
1809 retval = block_til_ready(tty, filp, info);
1810 if (retval) {
1811 #ifdef SERIAL_DEBUG_OPEN
1812 printk("rs_open returning after block_til_ready with %d\n",
1813 retval);
1814 #endif
1815 return retval;
1816 }
1817
1818 #ifdef SERIAL_DEBUG_OPEN
1819 printk("rs_open %s successful...", tty->name);
1820 #endif
1821 return 0;
1822 }
1823
1824 /*
1825 * /proc fs routines....
1826 */
1827
line_info(char * buf,struct serial_state * state)1828 static inline int line_info(char *buf, struct serial_state *state)
1829 {
1830 struct async_struct *info = state->info, scr_info;
1831 char stat_buf[30], control, status;
1832 int ret;
1833 unsigned long flags;
1834
1835 ret = sprintf(buf, "%d: uart:amiga_builtin",state->line);
1836
1837 /*
1838 * Figure out the current RS-232 lines
1839 */
1840 if (!info) {
1841 info = &scr_info; /* This is just for serial_{in,out} */
1842
1843 info->magic = SERIAL_MAGIC;
1844 info->flags = state->flags;
1845 info->quot = 0;
1846 info->tty = NULL;
1847 }
1848 local_irq_save(flags);
1849 status = ciab.pra;
1850 control = info ? info->MCR : status;
1851 local_irq_restore(flags);
1852
1853 stat_buf[0] = 0;
1854 stat_buf[1] = 0;
1855 if(!(control & SER_RTS))
1856 strcat(stat_buf, "|RTS");
1857 if(!(status & SER_CTS))
1858 strcat(stat_buf, "|CTS");
1859 if(!(control & SER_DTR))
1860 strcat(stat_buf, "|DTR");
1861 if(!(status & SER_DSR))
1862 strcat(stat_buf, "|DSR");
1863 if(!(status & SER_DCD))
1864 strcat(stat_buf, "|CD");
1865
1866 if (info->quot) {
1867 ret += sprintf(buf+ret, " baud:%d",
1868 state->baud_base / info->quot);
1869 }
1870
1871 ret += sprintf(buf+ret, " tx:%d rx:%d",
1872 state->icount.tx, state->icount.rx);
1873
1874 if (state->icount.frame)
1875 ret += sprintf(buf+ret, " fe:%d", state->icount.frame);
1876
1877 if (state->icount.parity)
1878 ret += sprintf(buf+ret, " pe:%d", state->icount.parity);
1879
1880 if (state->icount.brk)
1881 ret += sprintf(buf+ret, " brk:%d", state->icount.brk);
1882
1883 if (state->icount.overrun)
1884 ret += sprintf(buf+ret, " oe:%d", state->icount.overrun);
1885
1886 /*
1887 * Last thing is the RS-232 status lines
1888 */
1889 ret += sprintf(buf+ret, " %s\n", stat_buf+1);
1890 return ret;
1891 }
1892
rs_read_proc(char * page,char ** start,off_t off,int count,int * eof,void * data)1893 static int rs_read_proc(char *page, char **start, off_t off, int count,
1894 int *eof, void *data)
1895 {
1896 int len = 0, l;
1897 off_t begin = 0;
1898
1899 len += sprintf(page, "serinfo:1.0 driver:%s\n", serial_version);
1900 l = line_info(page + len, &rs_table[0]);
1901 len += l;
1902 if (len+begin > off+count)
1903 goto done;
1904 if (len+begin < off) {
1905 begin += len;
1906 len = 0;
1907 }
1908 *eof = 1;
1909 done:
1910 if (off >= len+begin)
1911 return 0;
1912 *start = page + (off-begin);
1913 return ((count < begin+len-off) ? count : begin+len-off);
1914 }
1915
1916 /*
1917 * ---------------------------------------------------------------------
1918 * rs_init() and friends
1919 *
1920 * rs_init() is called at boot-time to initialize the serial driver.
1921 * ---------------------------------------------------------------------
1922 */
1923
1924 /*
1925 * This routine prints out the appropriate serial driver version
1926 * number, and identifies which options were configured into this
1927 * driver.
1928 */
show_serial_version(void)1929 static void show_serial_version(void)
1930 {
1931 printk(KERN_INFO "%s version %s\n", serial_name, serial_version);
1932 }
1933
1934
1935 static const struct tty_operations serial_ops = {
1936 .open = rs_open,
1937 .close = rs_close,
1938 .write = rs_write,
1939 .put_char = rs_put_char,
1940 .flush_chars = rs_flush_chars,
1941 .write_room = rs_write_room,
1942 .chars_in_buffer = rs_chars_in_buffer,
1943 .flush_buffer = rs_flush_buffer,
1944 .ioctl = rs_ioctl,
1945 .throttle = rs_throttle,
1946 .unthrottle = rs_unthrottle,
1947 .set_termios = rs_set_termios,
1948 .stop = rs_stop,
1949 .start = rs_start,
1950 .hangup = rs_hangup,
1951 .break_ctl = rs_break,
1952 .send_xchar = rs_send_xchar,
1953 .wait_until_sent = rs_wait_until_sent,
1954 .read_proc = rs_read_proc,
1955 .tiocmget = rs_tiocmget,
1956 .tiocmset = rs_tiocmset,
1957 };
1958
1959 /*
1960 * The serial driver boot-time initialization code!
1961 */
rs_init(void)1962 static int __init rs_init(void)
1963 {
1964 unsigned long flags;
1965 struct serial_state * state;
1966 int error;
1967
1968 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_SERIAL))
1969 return -ENODEV;
1970
1971 serial_driver = alloc_tty_driver(1);
1972 if (!serial_driver)
1973 return -ENOMEM;
1974
1975 /*
1976 * We request SERDAT and SERPER only, because the serial registers are
1977 * too spreaded over the custom register space
1978 */
1979 if (!request_mem_region(CUSTOM_PHYSADDR+0x30, 4,
1980 "amiserial [Paula]")) {
1981 error = -EBUSY;
1982 goto fail_put_tty_driver;
1983 }
1984
1985 IRQ_ports = NULL;
1986
1987 show_serial_version();
1988
1989 /* Initialize the tty_driver structure */
1990
1991 serial_driver->owner = THIS_MODULE;
1992 serial_driver->driver_name = "amiserial";
1993 serial_driver->name = "ttyS";
1994 serial_driver->major = TTY_MAJOR;
1995 serial_driver->minor_start = 64;
1996 serial_driver->type = TTY_DRIVER_TYPE_SERIAL;
1997 serial_driver->subtype = SERIAL_TYPE_NORMAL;
1998 serial_driver->init_termios = tty_std_termios;
1999 serial_driver->init_termios.c_cflag =
2000 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
2001 serial_driver->flags = TTY_DRIVER_REAL_RAW;
2002 tty_set_operations(serial_driver, &serial_ops);
2003
2004 error = tty_register_driver(serial_driver);
2005 if (error)
2006 goto fail_release_mem_region;
2007
2008 state = rs_table;
2009 state->magic = SSTATE_MAGIC;
2010 state->port = (int)&custom.serdatr; /* Just to give it a value */
2011 state->line = 0;
2012 state->custom_divisor = 0;
2013 state->close_delay = 5*HZ/10;
2014 state->closing_wait = 30*HZ;
2015 state->icount.cts = state->icount.dsr =
2016 state->icount.rng = state->icount.dcd = 0;
2017 state->icount.rx = state->icount.tx = 0;
2018 state->icount.frame = state->icount.parity = 0;
2019 state->icount.overrun = state->icount.brk = 0;
2020
2021 printk(KERN_INFO "ttyS%d is the amiga builtin serial port\n",
2022 state->line);
2023
2024 /* Hardware set up */
2025
2026 state->baud_base = amiga_colorclock;
2027 state->xmit_fifo_size = 1;
2028
2029 local_irq_save(flags);
2030
2031 /* set ISRs, and then disable the rx interrupts */
2032 error = request_irq(IRQ_AMIGA_TBE, ser_tx_int, 0, "serial TX", state);
2033 if (error)
2034 goto fail_unregister;
2035
2036 error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED,
2037 "serial RX", state);
2038 if (error)
2039 goto fail_free_irq;
2040
2041 /* turn off Rx and Tx interrupts */
2042 custom.intena = IF_RBF | IF_TBE;
2043 mb();
2044
2045 /* clear any pending interrupt */
2046 custom.intreq = IF_RBF | IF_TBE;
2047 mb();
2048
2049 local_irq_restore(flags);
2050
2051 /*
2052 * set the appropriate directions for the modem control flags,
2053 * and clear RTS and DTR
2054 */
2055 ciab.ddra |= (SER_DTR | SER_RTS); /* outputs */
2056 ciab.ddra &= ~(SER_DCD | SER_CTS | SER_DSR); /* inputs */
2057
2058 return 0;
2059
2060 fail_free_irq:
2061 free_irq(IRQ_AMIGA_TBE, state);
2062 fail_unregister:
2063 tty_unregister_driver(serial_driver);
2064 fail_release_mem_region:
2065 release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2066 fail_put_tty_driver:
2067 put_tty_driver(serial_driver);
2068 return error;
2069 }
2070
rs_exit(void)2071 static __exit void rs_exit(void)
2072 {
2073 int error;
2074 struct async_struct *info = rs_table[0].info;
2075
2076 /* printk("Unloading %s: version %s\n", serial_name, serial_version); */
2077 tasklet_kill(&info->tlet);
2078 if ((error = tty_unregister_driver(serial_driver)))
2079 printk("SERIAL: failed to unregister serial driver (%d)\n",
2080 error);
2081 put_tty_driver(serial_driver);
2082
2083 if (info) {
2084 rs_table[0].info = NULL;
2085 kfree(info);
2086 }
2087
2088 free_irq(IRQ_AMIGA_TBE, rs_table);
2089 free_irq(IRQ_AMIGA_RBF, rs_table);
2090
2091 release_mem_region(CUSTOM_PHYSADDR+0x30, 4);
2092 }
2093
2094 module_init(rs_init)
module_exit(rs_exit)2095 module_exit(rs_exit)
2096
2097
2098 #if defined(CONFIG_SERIAL_CONSOLE) && !defined(MODULE)
2099
2100 /*
2101 * ------------------------------------------------------------
2102 * Serial console driver
2103 * ------------------------------------------------------------
2104 */
2105
2106 static void amiga_serial_putc(char c)
2107 {
2108 custom.serdat = (unsigned char)c | 0x100;
2109 while (!(custom.serdatr & 0x2000))
2110 barrier();
2111 }
2112
2113 /*
2114 * Print a string to the serial port trying not to disturb
2115 * any possible real use of the port...
2116 *
2117 * The console must be locked when we get here.
2118 */
serial_console_write(struct console * co,const char * s,unsigned count)2119 static void serial_console_write(struct console *co, const char *s,
2120 unsigned count)
2121 {
2122 unsigned short intena = custom.intenar;
2123
2124 custom.intena = IF_TBE;
2125
2126 while (count--) {
2127 if (*s == '\n')
2128 amiga_serial_putc('\r');
2129 amiga_serial_putc(*s++);
2130 }
2131
2132 custom.intena = IF_SETCLR | (intena & IF_TBE);
2133 }
2134
serial_console_device(struct console * c,int * index)2135 static struct tty_driver *serial_console_device(struct console *c, int *index)
2136 {
2137 *index = 0;
2138 return serial_driver;
2139 }
2140
2141 static struct console sercons = {
2142 .name = "ttyS",
2143 .write = serial_console_write,
2144 .device = serial_console_device,
2145 .flags = CON_PRINTBUFFER,
2146 .index = -1,
2147 };
2148
2149 /*
2150 * Register console.
2151 */
amiserial_console_init(void)2152 static int __init amiserial_console_init(void)
2153 {
2154 register_console(&sercons);
2155 return 0;
2156 }
2157 console_initcall(amiserial_console_init);
2158
2159 #endif /* CONFIG_SERIAL_CONSOLE && !MODULE */
2160
2161 MODULE_LICENSE("GPL");
2162