ACPICA: Lindent
[linux-2.6.git] / drivers / char / riscom8.c
1 /*
2  *      linux/drivers/char/riscom.c  -- RISCom/8 multiport serial driver.
3  *
4  *      Copyright (C) 1994-1996  Dmitry Gorodchanin (pgmdsg@ibi.com)
5  *
6  *      This code is loosely based on the Linux serial driver, written by
7  *      Linus Torvalds, Theodore T'so and others. The RISCom/8 card 
8  *      programming info was obtained from various drivers for other OSes 
9  *      (FreeBSD, ISC, etc), but no source code from those drivers were 
10  *      directly included in this driver.
11  *
12  *
13  *      This program is free software; you can redistribute it and/or modify
14  *      it under the terms of the GNU General Public License as published by
15  *      the Free Software Foundation; either version 2 of the License, or
16  *      (at your option) any later version.
17  *
18  *      This program is distributed in the hope that it will be useful,
19  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
20  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21  *      GNU General Public License for more details.
22  *
23  *      You should have received a copy of the GNU General Public License
24  *      along with this program; if not, write to the Free Software
25  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26  *
27  *      Revision 1.1
28  *
29  *      ChangeLog:
30  *      Arnaldo Carvalho de Melo <acme@conectiva.com.br> - 27-Jun-2001
31  *      - get rid of check_region and several cleanups
32  */
33
34 #include <linux/module.h>
35
36 #include <asm/io.h>
37 #include <linux/kernel.h>
38 #include <linux/sched.h>
39 #include <linux/ioport.h>
40 #include <linux/interrupt.h>
41 #include <linux/errno.h>
42 #include <linux/tty.h>
43 #include <linux/mm.h>
44 #include <linux/serial.h>
45 #include <linux/fcntl.h>
46 #include <linux/major.h>
47 #include <linux/init.h>
48 #include <linux/delay.h>
49 #include <linux/tty_flip.h>
50
51 #include <asm/uaccess.h>
52
53 #include "riscom8.h"
54 #include "riscom8_reg.h"
55
56 /* Am I paranoid or not ? ;-) */
57 #define RISCOM_PARANOIA_CHECK
58
59 /* 
60  * Crazy InteliCom/8 boards sometimes has swapped CTS & DSR signals.
61  * You can slightly speed up things by #undefing the following option,
62  * if you are REALLY sure that your board is correct one. 
63  */
64
65 #define RISCOM_BRAIN_DAMAGED_CTS
66
67 /* 
68  * The following defines are mostly for testing purposes. But if you need
69  * some nice reporting in your syslog, you can define them also.
70  */
71 #undef RC_REPORT_FIFO
72 #undef RC_REPORT_OVERRUN
73
74
75 #define RISCOM_LEGAL_FLAGS \
76         (ASYNC_HUP_NOTIFY   | ASYNC_SAK          | ASYNC_SPLIT_TERMIOS   | \
77          ASYNC_SPD_HI       | ASYNC_SPEED_VHI    | ASYNC_SESSION_LOCKOUT | \
78          ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP)
79
80 #define RS_EVENT_WRITE_WAKEUP   0
81
82 static struct riscom_board * IRQ_to_board[16];
83 static struct tty_driver *riscom_driver;
84
85 static struct riscom_board rc_board[RC_NBOARD] =  {
86         {
87                 .base   = RC_IOBASE1,
88         },
89         {
90                 .base   = RC_IOBASE2,
91         },
92         {
93                 .base   = RC_IOBASE3,
94         },
95         {
96                 .base   = RC_IOBASE4,
97         },
98 };
99
100 static struct riscom_port rc_port[RC_NBOARD * RC_NPORT];
101
102 /* RISCom/8 I/O ports addresses (without address translation) */
103 static unsigned short rc_ioport[] =  {
104 #if 1
105         0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c,
106 #else
107         0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x09, 0x0a, 0x0b, 0x0c, 0x10,
108         0x11, 0x12, 0x18, 0x28, 0x31, 0x32, 0x39, 0x3a, 0x40, 0x41, 0x61, 0x62,
109         0x63, 0x64, 0x6b, 0x70, 0x71, 0x78, 0x7a, 0x7b, 0x7f, 0x100, 0x101
110 #endif
111 };
112 #define RC_NIOPORT      ARRAY_SIZE(rc_ioport)
113
114
115 static inline int rc_paranoia_check(struct riscom_port const * port,
116                                     char *name, const char *routine)
117 {
118 #ifdef RISCOM_PARANOIA_CHECK
119         static const char badmagic[] = KERN_INFO
120                 "rc: Warning: bad riscom port magic number for device %s in %s\n";
121         static const char badinfo[] = KERN_INFO
122                 "rc: Warning: null riscom port for device %s in %s\n";
123
124         if (!port) {
125                 printk(badinfo, name, routine);
126                 return 1;
127         }
128         if (port->magic != RISCOM8_MAGIC) {
129                 printk(badmagic, name, routine);
130                 return 1;
131         }
132 #endif
133         return 0;
134 }
135
136 /*
137  * 
138  *  Service functions for RISCom/8 driver.
139  * 
140  */
141
142 /* Get board number from pointer */
143 static inline int board_No (struct riscom_board const * bp)
144 {
145         return bp - rc_board;
146 }
147
148 /* Get port number from pointer */
149 static inline int port_No (struct riscom_port const * port)
150 {
151         return RC_PORT(port - rc_port); 
152 }
153
154 /* Get pointer to board from pointer to port */
155 static inline struct riscom_board * port_Board(struct riscom_port const * port)
156 {
157         return &rc_board[RC_BOARD(port - rc_port)];
158 }
159
160 /* Input Byte from CL CD180 register */
161 static inline unsigned char rc_in(struct riscom_board const * bp, unsigned short reg)
162 {
163         return inb(bp->base + RC_TO_ISA(reg));
164 }
165
166 /* Output Byte to CL CD180 register */
167 static inline void rc_out(struct riscom_board const * bp, unsigned short reg,
168                           unsigned char val)
169 {
170         outb(val, bp->base + RC_TO_ISA(reg));
171 }
172
173 /* Wait for Channel Command Register ready */
174 static inline void rc_wait_CCR(struct riscom_board const * bp)
175 {
176         unsigned long delay;
177
178         /* FIXME: need something more descriptive then 100000 :) */
179         for (delay = 100000; delay; delay--) 
180                 if (!rc_in(bp, CD180_CCR))
181                         return;
182         
183         printk(KERN_INFO "rc%d: Timeout waiting for CCR.\n", board_No(bp));
184 }
185
186 /*
187  *  RISCom/8 probe functions.
188  */
189
190 static inline int rc_request_io_range(struct riscom_board * const bp)
191 {
192         int i;
193         
194         for (i = 0; i < RC_NIOPORT; i++)  
195                 if (!request_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1,
196                                    "RISCom/8"))  {
197                         goto out_release;
198                 }
199         return 0;
200 out_release:
201         printk(KERN_INFO "rc%d: Skipping probe at 0x%03x. IO address in use.\n",
202                          board_No(bp), bp->base);
203         while(--i >= 0)
204                 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
205         return 1;
206 }
207
208 static inline void rc_release_io_range(struct riscom_board * const bp)
209 {
210         int i;
211         
212         for (i = 0; i < RC_NIOPORT; i++)  
213                 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
214 }
215         
216 /* Must be called with enabled interrupts */
217 static inline void rc_long_delay(unsigned long delay)
218 {
219         unsigned long i;
220         
221         for (i = jiffies + delay; time_after(i,jiffies); ) ;
222 }
223
224 /* Reset and setup CD180 chip */
225 static void __init rc_init_CD180(struct riscom_board const * bp)
226 {
227         unsigned long flags;
228         
229         save_flags(flags); cli();
230         rc_out(bp, RC_CTOUT, 0);                   /* Clear timeout             */
231         rc_wait_CCR(bp);                           /* Wait for CCR ready        */
232         rc_out(bp, CD180_CCR, CCR_HARDRESET);      /* Reset CD180 chip          */
233         sti();
234         rc_long_delay(HZ/20);                      /* Delay 0.05 sec            */
235         cli();
236         rc_out(bp, CD180_GIVR, RC_ID);             /* Set ID for this chip      */
237         rc_out(bp, CD180_GICR, 0);                 /* Clear all bits            */
238         rc_out(bp, CD180_PILR1, RC_ACK_MINT);      /* Prio for modem intr       */
239         rc_out(bp, CD180_PILR2, RC_ACK_TINT);      /* Prio for transmitter intr */
240         rc_out(bp, CD180_PILR3, RC_ACK_RINT);      /* Prio for receiver intr    */
241         
242         /* Setting up prescaler. We need 4 ticks per 1 ms */
243         rc_out(bp, CD180_PPRH, (RC_OSCFREQ/(1000000/RISCOM_TPS)) >> 8);
244         rc_out(bp, CD180_PPRL, (RC_OSCFREQ/(1000000/RISCOM_TPS)) & 0xff);
245         
246         restore_flags(flags);
247 }
248
249 /* Main probing routine, also sets irq. */
250 static int __init rc_probe(struct riscom_board *bp)
251 {
252         unsigned char val1, val2;
253         int irqs = 0;
254         int retries;
255         
256         bp->irq = 0;
257
258         if (rc_request_io_range(bp))
259                 return 1;
260         
261         /* Are the I/O ports here ? */
262         rc_out(bp, CD180_PPRL, 0x5a);
263         outb(0xff, 0x80);
264         val1 = rc_in(bp, CD180_PPRL);
265         rc_out(bp, CD180_PPRL, 0xa5);
266         outb(0x00, 0x80);
267         val2 = rc_in(bp, CD180_PPRL);
268         
269         if ((val1 != 0x5a) || (val2 != 0xa5))  {
270                 printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not found.\n",
271                        board_No(bp), bp->base);
272                 goto out_release;
273         }
274         
275         /* It's time to find IRQ for this board */
276         for (retries = 0; retries < 5 && irqs <= 0; retries++)  {
277                 irqs = probe_irq_on();
278                 rc_init_CD180(bp);                      /* Reset CD180 chip       */
279                 rc_out(bp, CD180_CAR, 2);               /* Select port 2          */
280                 rc_wait_CCR(bp);
281                 rc_out(bp, CD180_CCR, CCR_TXEN);        /* Enable transmitter     */
282                 rc_out(bp, CD180_IER, IER_TXRDY);       /* Enable tx empty intr   */
283                 rc_long_delay(HZ/20);                   
284                 irqs = probe_irq_off(irqs);
285                 val1 = rc_in(bp, RC_BSR);               /* Get Board Status reg   */
286                 val2 = rc_in(bp, RC_ACK_TINT);          /* ACK interrupt          */
287                 rc_init_CD180(bp);                      /* Reset CD180 again      */
288         
289                 if ((val1 & RC_BSR_TINT) || (val2 != (RC_ID | GIVR_IT_TX)))  {
290                         printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not "
291                                         "found.\n", board_No(bp), bp->base);
292                         goto out_release;
293                 }
294         }
295         
296         if (irqs <= 0)  {
297                 printk(KERN_ERR "rc%d: Can't find IRQ for RISCom/8 board "
298                                 "at 0x%03x.\n", board_No(bp), bp->base);
299                 goto out_release;
300         }
301         bp->irq = irqs;
302         bp->flags |= RC_BOARD_PRESENT;
303         
304         printk(KERN_INFO "rc%d: RISCom/8 Rev. %c board detected at "
305                          "0x%03x, IRQ %d.\n",
306                board_No(bp),
307                (rc_in(bp, CD180_GFRCR) & 0x0f) + 'A',   /* Board revision */
308                bp->base, bp->irq);
309         
310         return 0;
311 out_release:
312         rc_release_io_range(bp);
313         return 1;
314 }
315
316 /* 
317  * 
318  *  Interrupt processing routines.
319  * 
320  */
321
322 static inline void rc_mark_event(struct riscom_port * port, int event)
323 {
324         set_bit(event, &port->event);
325         schedule_work(&port->tqueue);
326 }
327
328 static inline struct riscom_port * rc_get_port(struct riscom_board const * bp,
329                                                unsigned char const * what)
330 {
331         unsigned char channel;
332         struct riscom_port * port;
333         
334         channel = rc_in(bp, CD180_GICR) >> GICR_CHAN_OFF;
335         if (channel < CD180_NCH)  {
336                 port = &rc_port[board_No(bp) * RC_NPORT + channel];
337                 if (port->flags & ASYNC_INITIALIZED)  {
338                         return port;
339                 }
340         }
341         printk(KERN_ERR "rc%d: %s interrupt from invalid port %d\n", 
342                board_No(bp), what, channel);
343         return NULL;
344 }
345
346 static inline void rc_receive_exc(struct riscom_board const * bp)
347 {
348         struct riscom_port *port;
349         struct tty_struct *tty;
350         unsigned char status;
351         unsigned char ch, flag;
352         
353         if (!(port = rc_get_port(bp, "Receive")))
354                 return;
355
356         tty = port->tty;
357         
358 #ifdef RC_REPORT_OVERRUN        
359         status = rc_in(bp, CD180_RCSR);
360         if (status & RCSR_OE)
361                 port->overrun++;
362         status &= port->mark_mask;
363 #else   
364         status = rc_in(bp, CD180_RCSR) & port->mark_mask;
365 #endif  
366         ch = rc_in(bp, CD180_RDR);
367         if (!status)  {
368                 return;
369         }
370         if (status & RCSR_TOUT)  {
371                 printk(KERN_WARNING "rc%d: port %d: Receiver timeout. "
372                                     "Hardware problems ?\n", 
373                        board_No(bp), port_No(port));
374                 return;
375                 
376         } else if (status & RCSR_BREAK)  {
377                 printk(KERN_INFO "rc%d: port %d: Handling break...\n",
378                        board_No(bp), port_No(port));
379                 flag = TTY_BREAK;
380                 if (port->flags & ASYNC_SAK)
381                         do_SAK(tty);
382                 
383         } else if (status & RCSR_PE) 
384                 flag = TTY_PARITY;
385         
386         else if (status & RCSR_FE) 
387                 flag = TTY_FRAME;
388         
389         else if (status & RCSR_OE)
390                 flag = TTY_OVERRUN;
391         
392         else
393                 flag = TTY_NORMAL;
394         
395         tty_insert_flip_char(tty, ch, flag);
396         tty_flip_buffer_push(tty);
397 }
398
399 static inline void rc_receive(struct riscom_board const * bp)
400 {
401         struct riscom_port *port;
402         struct tty_struct *tty;
403         unsigned char count;
404         
405         if (!(port = rc_get_port(bp, "Receive")))
406                 return;
407         
408         tty = port->tty;
409         
410         count = rc_in(bp, CD180_RDCR);
411         
412 #ifdef RC_REPORT_FIFO
413         port->hits[count > 8 ? 9 : count]++;
414 #endif  
415         
416         while (count--)  {
417                 if (tty_buffer_request_room(tty, 1) == 0)  {
418                         printk(KERN_WARNING "rc%d: port %d: Working around "
419                                             "flip buffer overflow.\n",
420                                board_No(bp), port_No(port));
421                         break;
422                 }
423                 tty_insert_flip_char(tty, rc_in(bp, CD180_RDR), TTY_NORMAL);
424         }
425         tty_flip_buffer_push(tty);
426 }
427
428 static inline void rc_transmit(struct riscom_board const * bp)
429 {
430         struct riscom_port *port;
431         struct tty_struct *tty;
432         unsigned char count;
433         
434         
435         if (!(port = rc_get_port(bp, "Transmit")))
436                 return;
437         
438         tty = port->tty;
439         
440         if (port->IER & IER_TXEMPTY)  {
441                 /* FIFO drained */
442                 rc_out(bp, CD180_CAR, port_No(port));
443                 port->IER &= ~IER_TXEMPTY;
444                 rc_out(bp, CD180_IER, port->IER);
445                 return;
446         }
447         
448         if ((port->xmit_cnt <= 0 && !port->break_length)
449             || tty->stopped || tty->hw_stopped)  {
450                 rc_out(bp, CD180_CAR, port_No(port));
451                 port->IER &= ~IER_TXRDY;
452                 rc_out(bp, CD180_IER, port->IER);
453                 return;
454         }
455         
456         if (port->break_length)  {
457                 if (port->break_length > 0)  {
458                         if (port->COR2 & COR2_ETC)  {
459                                 rc_out(bp, CD180_TDR, CD180_C_ESC);
460                                 rc_out(bp, CD180_TDR, CD180_C_SBRK);
461                                 port->COR2 &= ~COR2_ETC;
462                         }
463                         count = min_t(int, port->break_length, 0xff);
464                         rc_out(bp, CD180_TDR, CD180_C_ESC);
465                         rc_out(bp, CD180_TDR, CD180_C_DELAY);
466                         rc_out(bp, CD180_TDR, count);
467                         if (!(port->break_length -= count))
468                                 port->break_length--;
469                 } else  {
470                         rc_out(bp, CD180_TDR, CD180_C_ESC);
471                         rc_out(bp, CD180_TDR, CD180_C_EBRK);
472                         rc_out(bp, CD180_COR2, port->COR2);
473                         rc_wait_CCR(bp);
474                         rc_out(bp, CD180_CCR, CCR_CORCHG2);
475                         port->break_length = 0;
476                 }
477                 return;
478         }
479         
480         count = CD180_NFIFO;
481         do {
482                 rc_out(bp, CD180_TDR, port->xmit_buf[port->xmit_tail++]);
483                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
484                 if (--port->xmit_cnt <= 0)
485                         break;
486         } while (--count > 0);
487         
488         if (port->xmit_cnt <= 0)  {
489                 rc_out(bp, CD180_CAR, port_No(port));
490                 port->IER &= ~IER_TXRDY;
491                 rc_out(bp, CD180_IER, port->IER);
492         }
493         if (port->xmit_cnt <= port->wakeup_chars)
494                 rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
495 }
496
497 static inline void rc_check_modem(struct riscom_board const * bp)
498 {
499         struct riscom_port *port;
500         struct tty_struct *tty;
501         unsigned char mcr;
502         
503         if (!(port = rc_get_port(bp, "Modem")))
504                 return;
505         
506         tty = port->tty;
507         
508         mcr = rc_in(bp, CD180_MCR);
509         if (mcr & MCR_CDCHG)  {
510                 if (rc_in(bp, CD180_MSVR) & MSVR_CD) 
511                         wake_up_interruptible(&port->open_wait);
512                 else
513                         schedule_work(&port->tqueue_hangup);
514         }
515         
516 #ifdef RISCOM_BRAIN_DAMAGED_CTS
517         if (mcr & MCR_CTSCHG)  {
518                 if (rc_in(bp, CD180_MSVR) & MSVR_CTS)  {
519                         tty->hw_stopped = 0;
520                         port->IER |= IER_TXRDY;
521                         if (port->xmit_cnt <= port->wakeup_chars)
522                                 rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
523                 } else  {
524                         tty->hw_stopped = 1;
525                         port->IER &= ~IER_TXRDY;
526                 }
527                 rc_out(bp, CD180_IER, port->IER);
528         }
529         if (mcr & MCR_DSRCHG)  {
530                 if (rc_in(bp, CD180_MSVR) & MSVR_DSR)  {
531                         tty->hw_stopped = 0;
532                         port->IER |= IER_TXRDY;
533                         if (port->xmit_cnt <= port->wakeup_chars)
534                                 rc_mark_event(port, RS_EVENT_WRITE_WAKEUP);
535                 } else  {
536                         tty->hw_stopped = 1;
537                         port->IER &= ~IER_TXRDY;
538                 }
539                 rc_out(bp, CD180_IER, port->IER);
540         }
541 #endif /* RISCOM_BRAIN_DAMAGED_CTS */
542         
543         /* Clear change bits */
544         rc_out(bp, CD180_MCR, 0);
545 }
546
547 /* The main interrupt processing routine */
548 static irqreturn_t rc_interrupt(int irq, void * dev_id)
549 {
550         unsigned char status;
551         unsigned char ack;
552         struct riscom_board *bp;
553         unsigned long loop = 0;
554         int handled = 0;
555
556         bp = IRQ_to_board[irq];
557
558         if (!(bp->flags & RC_BOARD_ACTIVE))
559                 return IRQ_NONE;
560
561         while ((++loop < 16) && ((status = ~(rc_in(bp, RC_BSR))) &
562                                  (RC_BSR_TOUT | RC_BSR_TINT |
563                                   RC_BSR_MINT | RC_BSR_RINT))) {
564                 handled = 1;
565                 if (status & RC_BSR_TOUT) 
566                         printk(KERN_WARNING "rc%d: Got timeout. Hardware "
567                                             "error?\n", board_No(bp));
568                 
569                 else if (status & RC_BSR_RINT) {
570                         ack = rc_in(bp, RC_ACK_RINT);
571                 
572                         if (ack == (RC_ID | GIVR_IT_RCV))
573                                 rc_receive(bp);
574                         else if (ack == (RC_ID | GIVR_IT_REXC))
575                                 rc_receive_exc(bp);
576                         else
577                                 printk(KERN_WARNING "rc%d: Bad receive ack "
578                                                     "0x%02x.\n",
579                                        board_No(bp), ack);
580                 
581                 } else if (status & RC_BSR_TINT) {
582                         ack = rc_in(bp, RC_ACK_TINT);
583                 
584                         if (ack == (RC_ID | GIVR_IT_TX))
585                                 rc_transmit(bp);
586                         else
587                                 printk(KERN_WARNING "rc%d: Bad transmit ack "
588                                                     "0x%02x.\n",
589                                        board_No(bp), ack);
590                 
591                 } else /* if (status & RC_BSR_MINT) */ {
592                         ack = rc_in(bp, RC_ACK_MINT);
593                 
594                         if (ack == (RC_ID | GIVR_IT_MODEM)) 
595                                 rc_check_modem(bp);
596                         else
597                                 printk(KERN_WARNING "rc%d: Bad modem ack "
598                                                     "0x%02x.\n",
599                                        board_No(bp), ack);
600                 
601                 } 
602
603                 rc_out(bp, CD180_EOIR, 0);   /* Mark end of interrupt */
604                 rc_out(bp, RC_CTOUT, 0);     /* Clear timeout flag    */
605         }
606         return IRQ_RETVAL(handled);
607 }
608
609 /*
610  *  Routines for open & close processing.
611  */
612
613 /* Called with disabled interrupts */
614 static inline int rc_setup_board(struct riscom_board * bp)
615 {
616         int error;
617
618         if (bp->flags & RC_BOARD_ACTIVE) 
619                 return 0;
620         
621         error = request_irq(bp->irq, rc_interrupt, IRQF_DISABLED,
622                             "RISCom/8", NULL);
623         if (error) 
624                 return error;
625         
626         rc_out(bp, RC_CTOUT, 0);                /* Just in case         */
627         bp->DTR = ~0;
628         rc_out(bp, RC_DTR, bp->DTR);            /* Drop DTR on all ports */
629         
630         IRQ_to_board[bp->irq] = bp;
631         bp->flags |= RC_BOARD_ACTIVE;
632         
633         return 0;
634 }
635
636 /* Called with disabled interrupts */
637 static inline void rc_shutdown_board(struct riscom_board *bp)
638 {
639         if (!(bp->flags & RC_BOARD_ACTIVE))
640                 return;
641         
642         bp->flags &= ~RC_BOARD_ACTIVE;
643         
644         free_irq(bp->irq, NULL);
645         IRQ_to_board[bp->irq] = NULL;
646         
647         bp->DTR = ~0;
648         rc_out(bp, RC_DTR, bp->DTR);           /* Drop DTR on all ports */
649         
650 }
651
652 /*
653  * Setting up port characteristics. 
654  * Must be called with disabled interrupts
655  */
656 static void rc_change_speed(struct riscom_board *bp, struct riscom_port *port)
657 {
658         struct tty_struct *tty;
659         unsigned long baud;
660         long tmp;
661         unsigned char cor1 = 0, cor3 = 0;
662         unsigned char mcor1 = 0, mcor2 = 0;
663         
664         if (!(tty = port->tty) || !tty->termios)
665                 return;
666
667         port->IER  = 0;
668         port->COR2 = 0;
669         port->MSVR = MSVR_RTS;
670         
671         baud = tty_get_baud_rate(tty);
672         
673         /* Select port on the board */
674         rc_out(bp, CD180_CAR, port_No(port));
675         
676         if (!baud)  {
677                 /* Drop DTR & exit */
678                 bp->DTR |= (1u << port_No(port));
679                 rc_out(bp, RC_DTR, bp->DTR);
680                 return;
681         } else  {
682                 /* Set DTR on */
683                 bp->DTR &= ~(1u << port_No(port));
684                 rc_out(bp, RC_DTR, bp->DTR);
685         }
686         
687         /*
688          * Now we must calculate some speed depended things 
689          */
690         
691         /* Set baud rate for port */
692         tmp = (((RC_OSCFREQ + baud/2) / baud +
693                 CD180_TPC/2) / CD180_TPC);
694
695         rc_out(bp, CD180_RBPRH, (tmp >> 8) & 0xff); 
696         rc_out(bp, CD180_TBPRH, (tmp >> 8) & 0xff); 
697         rc_out(bp, CD180_RBPRL, tmp & 0xff); 
698         rc_out(bp, CD180_TBPRL, tmp & 0xff);
699         
700         baud = (baud + 5) / 10;   /* Estimated CPS */
701         
702         /* Two timer ticks seems enough to wakeup something like SLIP driver */
703         tmp = ((baud + HZ/2) / HZ) * 2 - CD180_NFIFO;           
704         port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
705                                               SERIAL_XMIT_SIZE - 1 : tmp);
706         
707         /* Receiver timeout will be transmission time for 1.5 chars */
708         tmp = (RISCOM_TPS + RISCOM_TPS/2 + baud/2) / baud;
709         tmp = (tmp > 0xff) ? 0xff : tmp;
710         rc_out(bp, CD180_RTPR, tmp);
711         
712         switch (C_CSIZE(tty))  {
713          case CS5:
714                 cor1 |= COR1_5BITS;
715                 break;
716          case CS6:
717                 cor1 |= COR1_6BITS;
718                 break;
719          case CS7:
720                 cor1 |= COR1_7BITS;
721                 break;
722          case CS8:
723                 cor1 |= COR1_8BITS;
724                 break;
725         }
726         
727         if (C_CSTOPB(tty)) 
728                 cor1 |= COR1_2SB;
729         
730         cor1 |= COR1_IGNORE;
731         if (C_PARENB(tty))  {
732                 cor1 |= COR1_NORMPAR;
733                 if (C_PARODD(tty)) 
734                         cor1 |= COR1_ODDP;
735                 if (I_INPCK(tty)) 
736                         cor1 &= ~COR1_IGNORE;
737         }
738         /* Set marking of some errors */
739         port->mark_mask = RCSR_OE | RCSR_TOUT;
740         if (I_INPCK(tty)) 
741                 port->mark_mask |= RCSR_FE | RCSR_PE;
742         if (I_BRKINT(tty) || I_PARMRK(tty)) 
743                 port->mark_mask |= RCSR_BREAK;
744         if (I_IGNPAR(tty)) 
745                 port->mark_mask &= ~(RCSR_FE | RCSR_PE);
746         if (I_IGNBRK(tty))  {
747                 port->mark_mask &= ~RCSR_BREAK;
748                 if (I_IGNPAR(tty)) 
749                         /* Real raw mode. Ignore all */
750                         port->mark_mask &= ~RCSR_OE;
751         }
752         /* Enable Hardware Flow Control */
753         if (C_CRTSCTS(tty))  {
754 #ifdef RISCOM_BRAIN_DAMAGED_CTS
755                 port->IER |= IER_DSR | IER_CTS;
756                 mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
757                 mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
758                 tty->hw_stopped = !(rc_in(bp, CD180_MSVR) & (MSVR_CTS|MSVR_DSR));
759 #else
760                 port->COR2 |= COR2_CTSAE;
761 #endif
762         }
763         /* Enable Software Flow Control. FIXME: I'm not sure about this */
764         /* Some people reported that it works, but I still doubt */
765         if (I_IXON(tty))  {
766                 port->COR2 |= COR2_TXIBE;
767                 cor3 |= (COR3_FCT | COR3_SCDE);
768                 if (I_IXANY(tty))
769                         port->COR2 |= COR2_IXM;
770                 rc_out(bp, CD180_SCHR1, START_CHAR(tty));
771                 rc_out(bp, CD180_SCHR2, STOP_CHAR(tty));
772                 rc_out(bp, CD180_SCHR3, START_CHAR(tty));
773                 rc_out(bp, CD180_SCHR4, STOP_CHAR(tty));
774         }
775         if (!C_CLOCAL(tty))  {
776                 /* Enable CD check */
777                 port->IER |= IER_CD;
778                 mcor1 |= MCOR1_CDZD;
779                 mcor2 |= MCOR2_CDOD;
780         }
781         
782         if (C_CREAD(tty)) 
783                 /* Enable receiver */
784                 port->IER |= IER_RXD;
785         
786         /* Set input FIFO size (1-8 bytes) */
787         cor3 |= RISCOM_RXFIFO; 
788         /* Setting up CD180 channel registers */
789         rc_out(bp, CD180_COR1, cor1);
790         rc_out(bp, CD180_COR2, port->COR2);
791         rc_out(bp, CD180_COR3, cor3);
792         /* Make CD180 know about registers change */
793         rc_wait_CCR(bp);
794         rc_out(bp, CD180_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3);
795         /* Setting up modem option registers */
796         rc_out(bp, CD180_MCOR1, mcor1);
797         rc_out(bp, CD180_MCOR2, mcor2);
798         /* Enable CD180 transmitter & receiver */
799         rc_wait_CCR(bp);
800         rc_out(bp, CD180_CCR, CCR_TXEN | CCR_RXEN);
801         /* Enable interrupts */
802         rc_out(bp, CD180_IER, port->IER);
803         /* And finally set RTS on */
804         rc_out(bp, CD180_MSVR, port->MSVR);
805 }
806
807 /* Must be called with interrupts enabled */
808 static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port)
809 {
810         unsigned long flags;
811         
812         if (port->flags & ASYNC_INITIALIZED)
813                 return 0;
814         
815         if (!port->xmit_buf) {
816                 /* We may sleep in get_zeroed_page() */
817                 unsigned long tmp;
818                 
819                 if (!(tmp = get_zeroed_page(GFP_KERNEL)))
820                         return -ENOMEM;
821                     
822                 if (port->xmit_buf) {
823                         free_page(tmp);
824                         return -ERESTARTSYS;
825                 }
826                 port->xmit_buf = (unsigned char *) tmp;
827         }
828                 
829         save_flags(flags); cli();
830                 
831         if (port->tty) 
832                 clear_bit(TTY_IO_ERROR, &port->tty->flags);
833                 
834         if (port->count == 1) 
835                 bp->count++;
836                 
837         port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
838         rc_change_speed(bp, port);
839         port->flags |= ASYNC_INITIALIZED;
840                 
841         restore_flags(flags);
842         return 0;
843 }
844
845 /* Must be called with interrupts disabled */
846 static void rc_shutdown_port(struct riscom_board *bp, struct riscom_port *port)
847 {
848         struct tty_struct *tty;
849         
850         if (!(port->flags & ASYNC_INITIALIZED)) 
851                 return;
852         
853 #ifdef RC_REPORT_OVERRUN
854         printk(KERN_INFO "rc%d: port %d: Total %ld overruns were detected.\n",
855                board_No(bp), port_No(port), port->overrun);
856 #endif  
857 #ifdef RC_REPORT_FIFO
858         {
859                 int i;
860                 
861                 printk(KERN_INFO "rc%d: port %d: FIFO hits [ ",
862                        board_No(bp), port_No(port));
863                 for (i = 0; i < 10; i++)  {
864                         printk("%ld ", port->hits[i]);
865                 }
866                 printk("].\n");
867         }
868 #endif  
869         if (port->xmit_buf)  {
870                 free_page((unsigned long) port->xmit_buf);
871                 port->xmit_buf = NULL;
872         }
873
874         if (!(tty = port->tty) || C_HUPCL(tty))  {
875                 /* Drop DTR */
876                 bp->DTR |= (1u << port_No(port));
877                 rc_out(bp, RC_DTR, bp->DTR);
878         }
879         
880         /* Select port */
881         rc_out(bp, CD180_CAR, port_No(port));
882         /* Reset port */
883         rc_wait_CCR(bp);
884         rc_out(bp, CD180_CCR, CCR_SOFTRESET);
885         /* Disable all interrupts from this port */
886         port->IER = 0;
887         rc_out(bp, CD180_IER, port->IER);
888         
889         if (tty)  
890                 set_bit(TTY_IO_ERROR, &tty->flags);
891         port->flags &= ~ASYNC_INITIALIZED;
892         
893         if (--bp->count < 0)  {
894                 printk(KERN_INFO "rc%d: rc_shutdown_port: "
895                                  "bad board count: %d\n",
896                        board_No(bp), bp->count);
897                 bp->count = 0;
898         }
899         
900         /*
901          * If this is the last opened port on the board
902          * shutdown whole board
903          */
904         if (!bp->count) 
905                 rc_shutdown_board(bp);
906 }
907
908         
909 static int block_til_ready(struct tty_struct *tty, struct file * filp,
910                            struct riscom_port *port)
911 {
912         DECLARE_WAITQUEUE(wait, current);
913         struct riscom_board *bp = port_Board(port);
914         int    retval;
915         int    do_clocal = 0;
916         int    CD;
917
918         /*
919          * If the device is in the middle of being closed, then block
920          * until it's done, and then try again.
921          */
922         if (tty_hung_up_p(filp) || port->flags & ASYNC_CLOSING) {
923                 interruptible_sleep_on(&port->close_wait);
924                 if (port->flags & ASYNC_HUP_NOTIFY)
925                         return -EAGAIN;
926                 else
927                         return -ERESTARTSYS;
928         }
929
930         /*
931          * If non-blocking mode is set, or the port is not enabled,
932          * then make the check up front and then exit.
933          */
934         if ((filp->f_flags & O_NONBLOCK) ||
935             (tty->flags & (1 << TTY_IO_ERROR))) {
936                 port->flags |= ASYNC_NORMAL_ACTIVE;
937                 return 0;
938         }
939
940         if (C_CLOCAL(tty))  
941                 do_clocal = 1;
942
943         /*
944          * Block waiting for the carrier detect and the line to become
945          * free (i.e., not in use by the callout).  While we are in
946          * this loop, info->count is dropped by one, so that
947          * rs_close() knows when to free things.  We restore it upon
948          * exit, either normal or abnormal.
949          */
950         retval = 0;
951         add_wait_queue(&port->open_wait, &wait);
952         cli();
953         if (!tty_hung_up_p(filp))
954                 port->count--;
955         sti();
956         port->blocked_open++;
957         while (1) {
958                 cli();
959                 rc_out(bp, CD180_CAR, port_No(port));
960                 CD = rc_in(bp, CD180_MSVR) & MSVR_CD;
961                 rc_out(bp, CD180_MSVR, MSVR_RTS);
962                 bp->DTR &= ~(1u << port_No(port));
963                 rc_out(bp, RC_DTR, bp->DTR);
964                 sti();
965                 set_current_state(TASK_INTERRUPTIBLE);
966                 if (tty_hung_up_p(filp) ||
967                     !(port->flags & ASYNC_INITIALIZED)) {
968                         if (port->flags & ASYNC_HUP_NOTIFY)
969                                 retval = -EAGAIN;
970                         else
971                                 retval = -ERESTARTSYS;  
972                         break;
973                 }
974                 if (!(port->flags & ASYNC_CLOSING) &&
975                     (do_clocal || CD))
976                         break;
977                 if (signal_pending(current)) {
978                         retval = -ERESTARTSYS;
979                         break;
980                 }
981                 schedule();
982         }
983         __set_current_state(TASK_RUNNING);
984         remove_wait_queue(&port->open_wait, &wait);
985         if (!tty_hung_up_p(filp))
986                 port->count++;
987         port->blocked_open--;
988         if (retval)
989                 return retval;
990         
991         port->flags |= ASYNC_NORMAL_ACTIVE;
992         return 0;
993 }       
994
995 static int rc_open(struct tty_struct * tty, struct file * filp)
996 {
997         int board;
998         int error;
999         struct riscom_port * port;
1000         struct riscom_board * bp;
1001         
1002         board = RC_BOARD(tty->index);
1003         if (board >= RC_NBOARD || !(rc_board[board].flags & RC_BOARD_PRESENT))
1004                 return -ENODEV;
1005         
1006         bp = &rc_board[board];
1007         port = rc_port + board * RC_NPORT + RC_PORT(tty->index);
1008         if (rc_paranoia_check(port, tty->name, "rc_open"))
1009                 return -ENODEV;
1010         
1011         if ((error = rc_setup_board(bp))) 
1012                 return error;
1013                 
1014         port->count++;
1015         tty->driver_data = port;
1016         port->tty = tty;
1017         
1018         if ((error = rc_setup_port(bp, port))) 
1019                 return error;
1020         
1021         if ((error = block_til_ready(tty, filp, port)))
1022                 return error;
1023         
1024         return 0;
1025 }
1026
1027 static void rc_close(struct tty_struct * tty, struct file * filp)
1028 {
1029         struct riscom_port *port = (struct riscom_port *) tty->driver_data;
1030         struct riscom_board *bp;
1031         unsigned long flags;
1032         unsigned long timeout;
1033         
1034         if (!port || rc_paranoia_check(port, tty->name, "close"))
1035                 return;
1036         
1037         save_flags(flags); cli();
1038         if (tty_hung_up_p(filp))
1039                 goto out;
1040         
1041         bp = port_Board(port);
1042         if ((tty->count == 1) && (port->count != 1))  {
1043                 printk(KERN_INFO "rc%d: rc_close: bad port count;"
1044                        " tty->count is 1, port count is %d\n",
1045                        board_No(bp), port->count);
1046                 port->count = 1;
1047         }
1048         if (--port->count < 0)  {
1049                 printk(KERN_INFO "rc%d: rc_close: bad port count "
1050                                  "for tty%d: %d\n",
1051                        board_No(bp), port_No(port), port->count);
1052                 port->count = 0;
1053         }
1054         if (port->count)
1055                 goto out;
1056         port->flags |= ASYNC_CLOSING;
1057         /*
1058          * Now we wait for the transmit buffer to clear; and we notify 
1059          * the line discipline to only process XON/XOFF characters.
1060          */
1061         tty->closing = 1;
1062         if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
1063                 tty_wait_until_sent(tty, port->closing_wait);
1064         /*
1065          * At this point we stop accepting input.  To do this, we
1066          * disable the receive line status interrupts, and tell the
1067          * interrupt driver to stop checking the data ready bit in the
1068          * line status register.
1069          */
1070         port->IER &= ~IER_RXD;
1071         if (port->flags & ASYNC_INITIALIZED) {
1072                 port->IER &= ~IER_TXRDY;
1073                 port->IER |= IER_TXEMPTY;
1074                 rc_out(bp, CD180_CAR, port_No(port));
1075                 rc_out(bp, CD180_IER, port->IER);
1076                 /*
1077                  * Before we drop DTR, make sure the UART transmitter
1078                  * has completely drained; this is especially
1079                  * important if there is a transmit FIFO!
1080                  */
1081                 timeout = jiffies+HZ;
1082                 while(port->IER & IER_TXEMPTY)  {
1083                         msleep_interruptible(jiffies_to_msecs(port->timeout));
1084                         if (time_after(jiffies, timeout))
1085                                 break;
1086                 }
1087         }
1088         rc_shutdown_port(bp, port);
1089         if (tty->driver->flush_buffer)
1090                 tty->driver->flush_buffer(tty);
1091         tty_ldisc_flush(tty);
1092
1093         tty->closing = 0;
1094         port->event = 0;
1095         port->tty = NULL;
1096         if (port->blocked_open) {
1097                 if (port->close_delay) {
1098                         msleep_interruptible(jiffies_to_msecs(port->close_delay));
1099                 }
1100                 wake_up_interruptible(&port->open_wait);
1101         }
1102         port->flags &= ~(ASYNC_NORMAL_ACTIVE|ASYNC_CLOSING);
1103         wake_up_interruptible(&port->close_wait);
1104 out:    restore_flags(flags);
1105 }
1106
1107 static int rc_write(struct tty_struct * tty, 
1108                     const unsigned char *buf, int count)
1109 {
1110         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1111         struct riscom_board *bp;
1112         int c, total = 0;
1113         unsigned long flags;
1114                                 
1115         if (rc_paranoia_check(port, tty->name, "rc_write"))
1116                 return 0;
1117         
1118         bp = port_Board(port);
1119
1120         if (!tty || !port->xmit_buf)
1121                 return 0;
1122
1123         save_flags(flags);
1124         while (1) {
1125                 cli();          
1126                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
1127                                           SERIAL_XMIT_SIZE - port->xmit_head));
1128                 if (c <= 0) {
1129                         restore_flags(flags);
1130                         break;
1131                 }
1132
1133                 memcpy(port->xmit_buf + port->xmit_head, buf, c);
1134                 port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
1135                 port->xmit_cnt += c;
1136                 restore_flags(flags);
1137
1138                 buf += c;
1139                 count -= c;
1140                 total += c;
1141         }
1142
1143         cli();
1144         if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
1145             !(port->IER & IER_TXRDY)) {
1146                 port->IER |= IER_TXRDY;
1147                 rc_out(bp, CD180_CAR, port_No(port));
1148                 rc_out(bp, CD180_IER, port->IER);
1149         }
1150         restore_flags(flags);
1151
1152         return total;
1153 }
1154
1155 static void rc_put_char(struct tty_struct * tty, unsigned char ch)
1156 {
1157         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1158         unsigned long flags;
1159
1160         if (rc_paranoia_check(port, tty->name, "rc_put_char"))
1161                 return;
1162
1163         if (!tty || !port->xmit_buf)
1164                 return;
1165
1166         save_flags(flags); cli();
1167         
1168         if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1169                 goto out;
1170
1171         port->xmit_buf[port->xmit_head++] = ch;
1172         port->xmit_head &= SERIAL_XMIT_SIZE - 1;
1173         port->xmit_cnt++;
1174 out:    restore_flags(flags);
1175 }
1176
1177 static void rc_flush_chars(struct tty_struct * tty)
1178 {
1179         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1180         unsigned long flags;
1181                                 
1182         if (rc_paranoia_check(port, tty->name, "rc_flush_chars"))
1183                 return;
1184         
1185         if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped ||
1186             !port->xmit_buf)
1187                 return;
1188
1189         save_flags(flags); cli();
1190         port->IER |= IER_TXRDY;
1191         rc_out(port_Board(port), CD180_CAR, port_No(port));
1192         rc_out(port_Board(port), CD180_IER, port->IER);
1193         restore_flags(flags);
1194 }
1195
1196 static int rc_write_room(struct tty_struct * tty)
1197 {
1198         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1199         int     ret;
1200                                 
1201         if (rc_paranoia_check(port, tty->name, "rc_write_room"))
1202                 return 0;
1203
1204         ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
1205         if (ret < 0)
1206                 ret = 0;
1207         return ret;
1208 }
1209
1210 static int rc_chars_in_buffer(struct tty_struct *tty)
1211 {
1212         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1213                                 
1214         if (rc_paranoia_check(port, tty->name, "rc_chars_in_buffer"))
1215                 return 0;
1216         
1217         return port->xmit_cnt;
1218 }
1219
1220 static void rc_flush_buffer(struct tty_struct *tty)
1221 {
1222         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1223         unsigned long flags;
1224                                 
1225         if (rc_paranoia_check(port, tty->name, "rc_flush_buffer"))
1226                 return;
1227
1228         save_flags(flags); cli();
1229         port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
1230         restore_flags(flags);
1231         
1232         tty_wakeup(tty);
1233 }
1234
1235 static int rc_tiocmget(struct tty_struct *tty, struct file *file)
1236 {
1237         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1238         struct riscom_board * bp;
1239         unsigned char status;
1240         unsigned int result;
1241         unsigned long flags;
1242
1243         if (rc_paranoia_check(port, tty->name, __FUNCTION__))
1244                 return -ENODEV;
1245
1246         bp = port_Board(port);
1247         save_flags(flags); cli();
1248         rc_out(bp, CD180_CAR, port_No(port));
1249         status = rc_in(bp, CD180_MSVR);
1250         result = rc_in(bp, RC_RI) & (1u << port_No(port)) ? 0 : TIOCM_RNG;
1251         restore_flags(flags);
1252         result |= ((status & MSVR_RTS) ? TIOCM_RTS : 0)
1253                 | ((status & MSVR_DTR) ? TIOCM_DTR : 0)
1254                 | ((status & MSVR_CD)  ? TIOCM_CAR : 0)
1255                 | ((status & MSVR_DSR) ? TIOCM_DSR : 0)
1256                 | ((status & MSVR_CTS) ? TIOCM_CTS : 0);
1257         return result;
1258 }
1259
1260 static int rc_tiocmset(struct tty_struct *tty, struct file *file,
1261                        unsigned int set, unsigned int clear)
1262 {
1263         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1264         unsigned long flags;
1265         struct riscom_board *bp;
1266
1267         if (rc_paranoia_check(port, tty->name, __FUNCTION__))
1268                 return -ENODEV;
1269
1270         bp = port_Board(port);
1271
1272         save_flags(flags); cli();
1273         if (set & TIOCM_RTS)
1274                 port->MSVR |= MSVR_RTS;
1275         if (set & TIOCM_DTR)
1276                 bp->DTR &= ~(1u << port_No(port));
1277
1278         if (clear & TIOCM_RTS)
1279                 port->MSVR &= ~MSVR_RTS;
1280         if (clear & TIOCM_DTR)
1281                 bp->DTR |= (1u << port_No(port));
1282
1283         rc_out(bp, CD180_CAR, port_No(port));
1284         rc_out(bp, CD180_MSVR, port->MSVR);
1285         rc_out(bp, RC_DTR, bp->DTR);
1286         restore_flags(flags);
1287         return 0;
1288 }
1289
1290 static inline void rc_send_break(struct riscom_port * port, unsigned long length)
1291 {
1292         struct riscom_board *bp = port_Board(port);
1293         unsigned long flags;
1294         
1295         save_flags(flags); cli();
1296         port->break_length = RISCOM_TPS / HZ * length;
1297         port->COR2 |= COR2_ETC;
1298         port->IER  |= IER_TXRDY;
1299         rc_out(bp, CD180_CAR, port_No(port));
1300         rc_out(bp, CD180_COR2, port->COR2);
1301         rc_out(bp, CD180_IER, port->IER);
1302         rc_wait_CCR(bp);
1303         rc_out(bp, CD180_CCR, CCR_CORCHG2);
1304         rc_wait_CCR(bp);
1305         restore_flags(flags);
1306 }
1307
1308 static inline int rc_set_serial_info(struct riscom_port * port,
1309                                      struct serial_struct __user * newinfo)
1310 {
1311         struct serial_struct tmp;
1312         struct riscom_board *bp = port_Board(port);
1313         int change_speed;
1314         unsigned long flags;
1315         
1316         if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
1317                 return -EFAULT;
1318         
1319 #if 0   
1320         if ((tmp.irq != bp->irq) ||
1321             (tmp.port != bp->base) ||
1322             (tmp.type != PORT_CIRRUS) ||
1323             (tmp.baud_base != (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC) ||
1324             (tmp.custom_divisor != 0) ||
1325             (tmp.xmit_fifo_size != CD180_NFIFO) ||
1326             (tmp.flags & ~RISCOM_LEGAL_FLAGS))
1327                 return -EINVAL;
1328 #endif  
1329         
1330         change_speed = ((port->flags & ASYNC_SPD_MASK) !=
1331                         (tmp.flags & ASYNC_SPD_MASK));
1332         
1333         if (!capable(CAP_SYS_ADMIN)) {
1334                 if ((tmp.close_delay != port->close_delay) ||
1335                     (tmp.closing_wait != port->closing_wait) ||
1336                     ((tmp.flags & ~ASYNC_USR_MASK) !=
1337                      (port->flags & ~ASYNC_USR_MASK)))  
1338                         return -EPERM;
1339                 port->flags = ((port->flags & ~ASYNC_USR_MASK) |
1340                                (tmp.flags & ASYNC_USR_MASK));
1341         } else  {
1342                 port->flags = ((port->flags & ~ASYNC_FLAGS) |
1343                                (tmp.flags & ASYNC_FLAGS));
1344                 port->close_delay = tmp.close_delay;
1345                 port->closing_wait = tmp.closing_wait;
1346         }
1347         if (change_speed)  {
1348                 save_flags(flags); cli();
1349                 rc_change_speed(bp, port);
1350                 restore_flags(flags);
1351         }
1352         return 0;
1353 }
1354
1355 static inline int rc_get_serial_info(struct riscom_port * port,
1356                                      struct serial_struct __user *retinfo)
1357 {
1358         struct serial_struct tmp;
1359         struct riscom_board *bp = port_Board(port);
1360         
1361         memset(&tmp, 0, sizeof(tmp));
1362         tmp.type = PORT_CIRRUS;
1363         tmp.line = port - rc_port;
1364         tmp.port = bp->base;
1365         tmp.irq  = bp->irq;
1366         tmp.flags = port->flags;
1367         tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC;
1368         tmp.close_delay = port->close_delay * HZ/100;
1369         tmp.closing_wait = port->closing_wait * HZ/100;
1370         tmp.xmit_fifo_size = CD180_NFIFO;
1371         return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0;
1372 }
1373
1374 static int rc_ioctl(struct tty_struct * tty, struct file * filp, 
1375                     unsigned int cmd, unsigned long arg)
1376                     
1377 {
1378         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1379         void __user *argp = (void __user *)arg;
1380         int retval;
1381                                 
1382         if (rc_paranoia_check(port, tty->name, "rc_ioctl"))
1383                 return -ENODEV;
1384         
1385         switch (cmd) {
1386          case TCSBRK:   /* SVID version: non-zero arg --> no break */
1387                 retval = tty_check_change(tty);
1388                 if (retval)
1389                         return retval;
1390                 tty_wait_until_sent(tty, 0);
1391                 if (!arg)
1392                         rc_send_break(port, HZ/4);      /* 1/4 second */
1393                 break;
1394          case TCSBRKP:  /* support for POSIX tcsendbreak() */
1395                 retval = tty_check_change(tty);
1396                 if (retval)
1397                         return retval;
1398                 tty_wait_until_sent(tty, 0);
1399                 rc_send_break(port, arg ? arg*(HZ/10) : HZ/4);
1400                 break;
1401          case TIOCGSOFTCAR:
1402                 return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned __user *)argp);
1403          case TIOCSSOFTCAR:
1404                 if (get_user(arg,(unsigned __user *) argp))
1405                         return -EFAULT;
1406                 tty->termios->c_cflag =
1407                         ((tty->termios->c_cflag & ~CLOCAL) |
1408                         (arg ? CLOCAL : 0));
1409                 break;
1410          case TIOCGSERIAL:      
1411                 return rc_get_serial_info(port, argp);
1412          case TIOCSSERIAL:      
1413                 return rc_set_serial_info(port, argp);
1414          default:
1415                 return -ENOIOCTLCMD;
1416         }
1417         return 0;
1418 }
1419
1420 static void rc_throttle(struct tty_struct * tty)
1421 {
1422         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1423         struct riscom_board *bp;
1424         unsigned long flags;
1425                                 
1426         if (rc_paranoia_check(port, tty->name, "rc_throttle"))
1427                 return;
1428         
1429         bp = port_Board(port);
1430         
1431         save_flags(flags); cli();
1432         port->MSVR &= ~MSVR_RTS;
1433         rc_out(bp, CD180_CAR, port_No(port));
1434         if (I_IXOFF(tty))  {
1435                 rc_wait_CCR(bp);
1436                 rc_out(bp, CD180_CCR, CCR_SSCH2);
1437                 rc_wait_CCR(bp);
1438         }
1439         rc_out(bp, CD180_MSVR, port->MSVR);
1440         restore_flags(flags);
1441 }
1442
1443 static void rc_unthrottle(struct tty_struct * tty)
1444 {
1445         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1446         struct riscom_board *bp;
1447         unsigned long flags;
1448                                 
1449         if (rc_paranoia_check(port, tty->name, "rc_unthrottle"))
1450                 return;
1451         
1452         bp = port_Board(port);
1453         
1454         save_flags(flags); cli();
1455         port->MSVR |= MSVR_RTS;
1456         rc_out(bp, CD180_CAR, port_No(port));
1457         if (I_IXOFF(tty))  {
1458                 rc_wait_CCR(bp);
1459                 rc_out(bp, CD180_CCR, CCR_SSCH1);
1460                 rc_wait_CCR(bp);
1461         }
1462         rc_out(bp, CD180_MSVR, port->MSVR);
1463         restore_flags(flags);
1464 }
1465
1466 static void rc_stop(struct tty_struct * tty)
1467 {
1468         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1469         struct riscom_board *bp;
1470         unsigned long flags;
1471                                 
1472         if (rc_paranoia_check(port, tty->name, "rc_stop"))
1473                 return;
1474         
1475         bp = port_Board(port);
1476         
1477         save_flags(flags); cli();
1478         port->IER &= ~IER_TXRDY;
1479         rc_out(bp, CD180_CAR, port_No(port));
1480         rc_out(bp, CD180_IER, port->IER);
1481         restore_flags(flags);
1482 }
1483
1484 static void rc_start(struct tty_struct * tty)
1485 {
1486         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1487         struct riscom_board *bp;
1488         unsigned long flags;
1489                                 
1490         if (rc_paranoia_check(port, tty->name, "rc_start"))
1491                 return;
1492         
1493         bp = port_Board(port);
1494         
1495         save_flags(flags); cli();
1496         if (port->xmit_cnt && port->xmit_buf && !(port->IER & IER_TXRDY))  {
1497                 port->IER |= IER_TXRDY;
1498                 rc_out(bp, CD180_CAR, port_No(port));
1499                 rc_out(bp, CD180_IER, port->IER);
1500         }
1501         restore_flags(flags);
1502 }
1503
1504 /*
1505  * This routine is called from the work queue when the interrupt
1506  * routine has signalled that a hangup has occurred.  The path of
1507  * hangup processing is:
1508  *
1509  *      serial interrupt routine -> (workqueue) ->
1510  *      do_rc_hangup() -> tty->hangup() -> rc_hangup()
1511  * 
1512  */
1513 static void do_rc_hangup(struct work_struct *ugly_api)
1514 {
1515         struct riscom_port      *port = container_of(ugly_api, struct riscom_port, tqueue_hangup);
1516         struct tty_struct       *tty;
1517         
1518         tty = port->tty;
1519         if (tty)
1520                 tty_hangup(tty);        /* FIXME: module removal race still here */
1521 }
1522
1523 static void rc_hangup(struct tty_struct * tty)
1524 {
1525         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1526         struct riscom_board *bp;
1527                                 
1528         if (rc_paranoia_check(port, tty->name, "rc_hangup"))
1529                 return;
1530         
1531         bp = port_Board(port);
1532         
1533         rc_shutdown_port(bp, port);
1534         port->event = 0;
1535         port->count = 0;
1536         port->flags &= ~ASYNC_NORMAL_ACTIVE;
1537         port->tty = NULL;
1538         wake_up_interruptible(&port->open_wait);
1539 }
1540
1541 static void rc_set_termios(struct tty_struct * tty, struct ktermios * old_termios)
1542 {
1543         struct riscom_port *port = (struct riscom_port *)tty->driver_data;
1544         unsigned long flags;
1545                                 
1546         if (rc_paranoia_check(port, tty->name, "rc_set_termios"))
1547                 return;
1548         
1549         if (tty->termios->c_cflag == old_termios->c_cflag &&
1550             tty->termios->c_iflag == old_termios->c_iflag)
1551                 return;
1552
1553         save_flags(flags); cli();
1554         rc_change_speed(port_Board(port), port);
1555         restore_flags(flags);
1556
1557         if ((old_termios->c_cflag & CRTSCTS) &&
1558             !(tty->termios->c_cflag & CRTSCTS)) {
1559                 tty->hw_stopped = 0;
1560                 rc_start(tty);
1561         }
1562 }
1563
1564 static void do_softint(struct work_struct *ugly_api)
1565 {
1566         struct riscom_port      *port = container_of(ugly_api, struct riscom_port, tqueue);
1567         struct tty_struct       *tty;
1568         
1569         if(!(tty = port->tty)) 
1570                 return;
1571
1572         if (test_and_clear_bit(RS_EVENT_WRITE_WAKEUP, &port->event))
1573                 tty_wakeup(tty);
1574 }
1575
1576 static const struct tty_operations riscom_ops = {
1577         .open  = rc_open,
1578         .close = rc_close,
1579         .write = rc_write,
1580         .put_char = rc_put_char,
1581         .flush_chars = rc_flush_chars,
1582         .write_room = rc_write_room,
1583         .chars_in_buffer = rc_chars_in_buffer,
1584         .flush_buffer = rc_flush_buffer,
1585         .ioctl = rc_ioctl,
1586         .throttle = rc_throttle,
1587         .unthrottle = rc_unthrottle,
1588         .set_termios = rc_set_termios,
1589         .stop = rc_stop,
1590         .start = rc_start,
1591         .hangup = rc_hangup,
1592         .tiocmget = rc_tiocmget,
1593         .tiocmset = rc_tiocmset,
1594 };
1595
1596 static inline int rc_init_drivers(void)
1597 {
1598         int error;
1599         int i;
1600
1601         riscom_driver = alloc_tty_driver(RC_NBOARD * RC_NPORT);
1602         if (!riscom_driver)     
1603                 return -ENOMEM;
1604         
1605         memset(IRQ_to_board, 0, sizeof(IRQ_to_board));
1606         riscom_driver->owner = THIS_MODULE;
1607         riscom_driver->name = "ttyL";
1608         riscom_driver->major = RISCOM8_NORMAL_MAJOR;
1609         riscom_driver->type = TTY_DRIVER_TYPE_SERIAL;
1610         riscom_driver->subtype = SERIAL_TYPE_NORMAL;
1611         riscom_driver->init_termios = tty_std_termios;
1612         riscom_driver->init_termios.c_cflag =
1613                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1614         riscom_driver->init_termios.c_ispeed = 9600;
1615         riscom_driver->init_termios.c_ospeed = 9600;
1616         riscom_driver->flags = TTY_DRIVER_REAL_RAW;
1617         tty_set_operations(riscom_driver, &riscom_ops);
1618         if ((error = tty_register_driver(riscom_driver)))  {
1619                 put_tty_driver(riscom_driver);
1620                 printk(KERN_ERR "rc: Couldn't register RISCom/8 driver, "
1621                                 "error = %d\n",
1622                        error);
1623                 return 1;
1624         }
1625
1626         memset(rc_port, 0, sizeof(rc_port));
1627         for (i = 0; i < RC_NPORT * RC_NBOARD; i++)  {
1628                 rc_port[i].magic = RISCOM8_MAGIC;
1629                 INIT_WORK(&rc_port[i].tqueue, do_softint);
1630                 INIT_WORK(&rc_port[i].tqueue_hangup, do_rc_hangup);
1631                 rc_port[i].close_delay = 50 * HZ/100;
1632                 rc_port[i].closing_wait = 3000 * HZ/100;
1633                 init_waitqueue_head(&rc_port[i].open_wait);
1634                 init_waitqueue_head(&rc_port[i].close_wait);
1635         }
1636         
1637         return 0;
1638 }
1639
1640 static void rc_release_drivers(void)
1641 {
1642         unsigned long flags;
1643
1644         save_flags(flags);
1645         cli();
1646         tty_unregister_driver(riscom_driver);
1647         put_tty_driver(riscom_driver);
1648         restore_flags(flags);
1649 }
1650
1651 #ifndef MODULE
1652 /*
1653  * Called at boot time.
1654  * 
1655  * You can specify IO base for up to RC_NBOARD cards,
1656  * using line "riscom8=0xiobase1,0xiobase2,.." at LILO prompt.
1657  * Note that there will be no probing at default
1658  * addresses in this case.
1659  *
1660  */ 
1661 static int __init riscom8_setup(char *str)
1662 {
1663         int ints[RC_NBOARD];
1664         int i;
1665
1666         str = get_options(str, ARRAY_SIZE(ints), ints);
1667
1668         for (i = 0; i < RC_NBOARD; i++) {
1669                 if (i < ints[0])
1670                         rc_board[i].base = ints[i+1];
1671                 else 
1672                         rc_board[i].base = 0;
1673         }
1674         return 1;
1675 }
1676
1677 __setup("riscom8=", riscom8_setup);
1678 #endif
1679
1680 static char banner[] __initdata =
1681         KERN_INFO "rc: SDL RISCom/8 card driver v1.1, (c) D.Gorodchanin "
1682                   "1994-1996.\n";
1683 static char no_boards_msg[] __initdata =
1684         KERN_INFO "rc: No RISCom/8 boards detected.\n";
1685
1686 /* 
1687  * This routine must be called by kernel at boot time 
1688  */
1689 static int __init riscom8_init(void)
1690 {
1691         int i;
1692         int found = 0;
1693
1694         printk(banner);
1695
1696         if (rc_init_drivers()) 
1697                 return -EIO;
1698
1699         for (i = 0; i < RC_NBOARD; i++) 
1700                 if (rc_board[i].base && !rc_probe(&rc_board[i]))  
1701                         found++;
1702         
1703         if (!found)  {
1704                 rc_release_drivers();
1705                 printk(no_boards_msg);
1706                 return -EIO;
1707         }
1708         return 0;
1709 }
1710
1711 #ifdef MODULE
1712 static int iobase;
1713 static int iobase1;
1714 static int iobase2;
1715 static int iobase3;
1716 module_param(iobase, int, 0);
1717 module_param(iobase1, int, 0);
1718 module_param(iobase2, int, 0);
1719 module_param(iobase3, int, 0);
1720
1721 MODULE_LICENSE("GPL");
1722 #endif /* MODULE */
1723
1724 /*
1725  * You can setup up to 4 boards (current value of RC_NBOARD)
1726  * by specifying "iobase=0xXXX iobase1=0xXXX ..." as insmod parameter.
1727  *
1728  */
1729 static int __init riscom8_init_module (void)
1730 {
1731 #ifdef MODULE
1732         int i;
1733
1734         if (iobase || iobase1 || iobase2 || iobase3) {
1735                 for(i = 0; i < RC_NBOARD; i++)
1736                         rc_board[0].base = 0;
1737         }
1738
1739         if (iobase)
1740                 rc_board[0].base = iobase;
1741         if (iobase1)
1742                 rc_board[1].base = iobase1;
1743         if (iobase2)
1744                 rc_board[2].base = iobase2;
1745         if (iobase3)
1746                 rc_board[3].base = iobase3;
1747 #endif /* MODULE */
1748
1749         return riscom8_init();
1750 }
1751         
1752 static void __exit riscom8_exit_module (void)
1753 {
1754         int i;
1755         
1756         rc_release_drivers();
1757         for (i = 0; i < RC_NBOARD; i++)  
1758                 if (rc_board[i].flags & RC_BOARD_PRESENT) 
1759                         rc_release_io_range(&rc_board[i]);
1760         
1761 }
1762
1763 module_init(riscom8_init_module);
1764 module_exit(riscom8_exit_module);
1765