tty: Remove some pointless casts
[linux-3.10.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 <linux/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 #include <linux/spinlock.h>
51
52 #include <linux/uaccess.h>
53
54 #include "riscom8.h"
55 #include "riscom8_reg.h"
56
57 /* Am I paranoid or not ? ;-) */
58 #define RISCOM_PARANOIA_CHECK
59
60 /*
61  * Crazy InteliCom/8 boards sometimes have swapped CTS & DSR signals.
62  * You can slightly speed up things by #undefing the following option,
63  * if you are REALLY sure that your board is correct one.
64  */
65
66 #define RISCOM_BRAIN_DAMAGED_CTS
67
68 /*
69  * The following defines are mostly for testing purposes. But if you need
70  * some nice reporting in your syslog, you can define them also.
71  */
72 #undef RC_REPORT_FIFO
73 #undef RC_REPORT_OVERRUN
74
75
76 #define RISCOM_LEGAL_FLAGS \
77         (ASYNC_HUP_NOTIFY   | ASYNC_SAK          | ASYNC_SPLIT_TERMIOS   | \
78          ASYNC_SPD_HI       | ASYNC_SPEED_VHI    | ASYNC_SESSION_LOCKOUT | \
79          ASYNC_PGRP_LOCKOUT | ASYNC_CALLOUT_NOHUP)
80
81 static struct tty_driver *riscom_driver;
82
83 static DEFINE_SPINLOCK(riscom_lock);
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 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,
162                                                         unsigned short reg)
163 {
164         return inb(bp->base + RC_TO_ISA(reg));
165 }
166
167 /* Output Byte to CL CD180 register */
168 static inline void rc_out(struct riscom_board const *bp, unsigned short reg,
169                           unsigned char val)
170 {
171         outb(val, bp->base + RC_TO_ISA(reg));
172 }
173
174 /* Wait for Channel Command Register ready */
175 static void rc_wait_CCR(struct riscom_board const *bp)
176 {
177         unsigned long delay;
178
179         /* FIXME: need something more descriptive then 100000 :) */
180         for (delay = 100000; delay; delay--)
181                 if (!rc_in(bp, CD180_CCR))
182                         return;
183
184         printk(KERN_INFO "rc%d: Timeout waiting for CCR.\n", board_No(bp));
185 }
186
187 /*
188  *  RISCom/8 probe functions.
189  */
190
191 static int rc_request_io_range(struct riscom_board * const bp)
192 {
193         int i;
194
195         for (i = 0; i < RC_NIOPORT; i++)
196                 if (!request_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1,
197                                    "RISCom/8"))  {
198                         goto out_release;
199                 }
200         return 0;
201 out_release:
202         printk(KERN_INFO "rc%d: Skipping probe at 0x%03x. IO address in use.\n",
203                          board_No(bp), bp->base);
204         while (--i >= 0)
205                 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
206         return 1;
207 }
208
209 static void rc_release_io_range(struct riscom_board * const bp)
210 {
211         int i;
212
213         for (i = 0; i < RC_NIOPORT; i++)
214                 release_region(RC_TO_ISA(rc_ioport[i]) + bp->base, 1);
215 }
216
217 /* Reset and setup CD180 chip */
218 static void __init rc_init_CD180(struct riscom_board const *bp)
219 {
220         unsigned long flags;
221
222         spin_lock_irqsave(&riscom_lock, flags);
223
224         rc_out(bp, RC_CTOUT, 0);                   /* Clear timeout        */
225         rc_wait_CCR(bp);                           /* Wait for CCR ready   */
226         rc_out(bp, CD180_CCR, CCR_HARDRESET);      /* Reset CD180 chip     */
227         spin_unlock_irqrestore(&riscom_lock, flags);
228         msleep(50);                                /* Delay 0.05 sec       */
229         spin_lock_irqsave(&riscom_lock, flags);
230         rc_out(bp, CD180_GIVR, RC_ID);             /* Set ID for this chip */
231         rc_out(bp, CD180_GICR, 0);                 /* Clear all bits       */
232         rc_out(bp, CD180_PILR1, RC_ACK_MINT);      /* Prio for modem intr  */
233         rc_out(bp, CD180_PILR2, RC_ACK_TINT);      /* Prio for tx intr     */
234         rc_out(bp, CD180_PILR3, RC_ACK_RINT);      /* Prio for rx intr     */
235
236         /* Setting up prescaler. We need 4 ticks per 1 ms */
237         rc_out(bp, CD180_PPRH, (RC_OSCFREQ/(1000000/RISCOM_TPS)) >> 8);
238         rc_out(bp, CD180_PPRL, (RC_OSCFREQ/(1000000/RISCOM_TPS)) & 0xff);
239
240         spin_unlock_irqrestore(&riscom_lock, flags);
241 }
242
243 /* Main probing routine, also sets irq. */
244 static int __init rc_probe(struct riscom_board *bp)
245 {
246         unsigned char val1, val2;
247         int irqs = 0;
248         int retries;
249
250         bp->irq = 0;
251
252         if (rc_request_io_range(bp))
253                 return 1;
254
255         /* Are the I/O ports here ? */
256         rc_out(bp, CD180_PPRL, 0x5a);
257         outb(0xff, 0x80);
258         val1 = rc_in(bp, CD180_PPRL);
259         rc_out(bp, CD180_PPRL, 0xa5);
260         outb(0x00, 0x80);
261         val2 = rc_in(bp, CD180_PPRL);
262
263         if ((val1 != 0x5a) || (val2 != 0xa5))  {
264                 printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not found.\n",
265                        board_No(bp), bp->base);
266                 goto out_release;
267         }
268
269         /* It's time to find IRQ for this board */
270         for (retries = 0; retries < 5 && irqs <= 0; retries++) {
271                 irqs = probe_irq_on();
272                 rc_init_CD180(bp);               /* Reset CD180 chip         */
273                 rc_out(bp, CD180_CAR, 2);        /* Select port 2            */
274                 rc_wait_CCR(bp);
275                 rc_out(bp, CD180_CCR, CCR_TXEN); /* Enable transmitter       */
276                 rc_out(bp, CD180_IER, IER_TXRDY);/* Enable tx empty intr     */
277                 msleep(50);
278                 irqs = probe_irq_off(irqs);
279                 val1 = rc_in(bp, RC_BSR);       /* Get Board Status reg      */
280                 val2 = rc_in(bp, RC_ACK_TINT);  /* ACK interrupt             */
281                 rc_init_CD180(bp);              /* Reset CD180 again         */
282
283                 if ((val1 & RC_BSR_TINT) || (val2 != (RC_ID | GIVR_IT_TX)))  {
284                         printk(KERN_ERR "rc%d: RISCom/8 Board at 0x%03x not "
285                                         "found.\n", board_No(bp), bp->base);
286                         goto out_release;
287                 }
288         }
289
290         if (irqs <= 0)  {
291                 printk(KERN_ERR "rc%d: Can't find IRQ for RISCom/8 board "
292                                 "at 0x%03x.\n", board_No(bp), bp->base);
293                 goto out_release;
294         }
295         bp->irq = irqs;
296         bp->flags |= RC_BOARD_PRESENT;
297
298         printk(KERN_INFO "rc%d: RISCom/8 Rev. %c board detected at "
299                          "0x%03x, IRQ %d.\n",
300                board_No(bp),
301                (rc_in(bp, CD180_GFRCR) & 0x0f) + 'A',   /* Board revision */
302                bp->base, bp->irq);
303
304         return 0;
305 out_release:
306         rc_release_io_range(bp);
307         return 1;
308 }
309
310 /*
311  *
312  *  Interrupt processing routines.
313  *
314  */
315
316 static struct riscom_port *rc_get_port(struct riscom_board const *bp,
317                                                unsigned char const *what)
318 {
319         unsigned char channel;
320         struct riscom_port *port;
321
322         channel = rc_in(bp, CD180_GICR) >> GICR_CHAN_OFF;
323         if (channel < CD180_NCH)  {
324                 port = &rc_port[board_No(bp) * RC_NPORT + channel];
325                 if (port->port.flags & ASYNC_INITIALIZED)
326                         return port;
327         }
328         printk(KERN_ERR "rc%d: %s interrupt from invalid port %d\n",
329                board_No(bp), what, channel);
330         return NULL;
331 }
332
333 static void rc_receive_exc(struct riscom_board const *bp)
334 {
335         struct riscom_port *port;
336         struct tty_struct *tty;
337         unsigned char status;
338         unsigned char ch, flag;
339
340         port = rc_get_port(bp, "Receive");
341         if (port == NULL)
342                 return;
343
344         tty = port->port.tty;
345
346 #ifdef RC_REPORT_OVERRUN
347         status = rc_in(bp, CD180_RCSR);
348         if (status & RCSR_OE)
349                 port->overrun++;
350         status &= port->mark_mask;
351 #else
352         status = rc_in(bp, CD180_RCSR) & port->mark_mask;
353 #endif
354         ch = rc_in(bp, CD180_RDR);
355         if (!status)
356                 return;
357         if (status & RCSR_TOUT)  {
358                 printk(KERN_WARNING "rc%d: port %d: Receiver timeout. "
359                                     "Hardware problems ?\n",
360                        board_No(bp), port_No(port));
361                 return;
362
363         } else if (status & RCSR_BREAK)  {
364                 printk(KERN_INFO "rc%d: port %d: Handling break...\n",
365                        board_No(bp), port_No(port));
366                 flag = TTY_BREAK;
367                 if (port->port.flags & ASYNC_SAK)
368                         do_SAK(tty);
369
370         } else if (status & RCSR_PE)
371                 flag = TTY_PARITY;
372
373         else if (status & RCSR_FE)
374                 flag = TTY_FRAME;
375
376         else if (status & RCSR_OE)
377                 flag = TTY_OVERRUN;
378         else
379                 flag = TTY_NORMAL;
380
381         tty_insert_flip_char(tty, ch, flag);
382         tty_flip_buffer_push(tty);
383 }
384
385 static void rc_receive(struct riscom_board const *bp)
386 {
387         struct riscom_port *port;
388         struct tty_struct *tty;
389         unsigned char count;
390
391         port = rc_get_port(bp, "Receive");
392         if (port == NULL)
393                 return;
394
395         tty = port->port.tty;
396
397         count = rc_in(bp, CD180_RDCR);
398
399 #ifdef RC_REPORT_FIFO
400         port->hits[count > 8 ? 9 : count]++;
401 #endif
402
403         while (count--)  {
404                 if (tty_buffer_request_room(tty, 1) == 0)  {
405                         printk(KERN_WARNING "rc%d: port %d: Working around "
406                                             "flip buffer overflow.\n",
407                                board_No(bp), port_No(port));
408                         break;
409                 }
410                 tty_insert_flip_char(tty, rc_in(bp, CD180_RDR), TTY_NORMAL);
411         }
412         tty_flip_buffer_push(tty);
413 }
414
415 static void rc_transmit(struct riscom_board const *bp)
416 {
417         struct riscom_port *port;
418         struct tty_struct *tty;
419         unsigned char count;
420
421         port = rc_get_port(bp, "Transmit");
422         if (port == NULL)
423                 return;
424
425         tty = port->port.tty;
426
427         if (port->IER & IER_TXEMPTY) {
428                 /* FIFO drained */
429                 rc_out(bp, CD180_CAR, port_No(port));
430                 port->IER &= ~IER_TXEMPTY;
431                 rc_out(bp, CD180_IER, port->IER);
432                 return;
433         }
434
435         if ((port->xmit_cnt <= 0 && !port->break_length)
436             || tty->stopped || tty->hw_stopped)  {
437                 rc_out(bp, CD180_CAR, port_No(port));
438                 port->IER &= ~IER_TXRDY;
439                 rc_out(bp, CD180_IER, port->IER);
440                 return;
441         }
442
443         if (port->break_length)  {
444                 if (port->break_length > 0)  {
445                         if (port->COR2 & COR2_ETC)  {
446                                 rc_out(bp, CD180_TDR, CD180_C_ESC);
447                                 rc_out(bp, CD180_TDR, CD180_C_SBRK);
448                                 port->COR2 &= ~COR2_ETC;
449                         }
450                         count = min_t(int, port->break_length, 0xff);
451                         rc_out(bp, CD180_TDR, CD180_C_ESC);
452                         rc_out(bp, CD180_TDR, CD180_C_DELAY);
453                         rc_out(bp, CD180_TDR, count);
454                         port->break_length -= count;
455                         if (port->break_length == 0)
456                                 port->break_length--;
457                 } else  {
458                         rc_out(bp, CD180_TDR, CD180_C_ESC);
459                         rc_out(bp, CD180_TDR, CD180_C_EBRK);
460                         rc_out(bp, CD180_COR2, port->COR2);
461                         rc_wait_CCR(bp);
462                         rc_out(bp, CD180_CCR, CCR_CORCHG2);
463                         port->break_length = 0;
464                 }
465                 return;
466         }
467
468         count = CD180_NFIFO;
469         do {
470                 rc_out(bp, CD180_TDR, port->port.xmit_buf[port->xmit_tail++]);
471                 port->xmit_tail = port->xmit_tail & (SERIAL_XMIT_SIZE-1);
472                 if (--port->xmit_cnt <= 0)
473                         break;
474         } while (--count > 0);
475
476         if (port->xmit_cnt <= 0)  {
477                 rc_out(bp, CD180_CAR, port_No(port));
478                 port->IER &= ~IER_TXRDY;
479                 rc_out(bp, CD180_IER, port->IER);
480         }
481         if (port->xmit_cnt <= port->wakeup_chars)
482                 tty_wakeup(tty);
483 }
484
485 static void rc_check_modem(struct riscom_board const *bp)
486 {
487         struct riscom_port *port;
488         struct tty_struct *tty;
489         unsigned char mcr;
490
491         port = rc_get_port(bp, "Modem");
492         if (port == NULL)
493                 return;
494
495         tty = port->port.tty;
496
497         mcr = rc_in(bp, CD180_MCR);
498         if (mcr & MCR_CDCHG) {
499                 if (rc_in(bp, CD180_MSVR) & MSVR_CD)
500                         wake_up_interruptible(&port->port.open_wait);
501                 else
502                         tty_hangup(tty);
503         }
504
505 #ifdef RISCOM_BRAIN_DAMAGED_CTS
506         if (mcr & MCR_CTSCHG)  {
507                 if (rc_in(bp, CD180_MSVR) & MSVR_CTS)  {
508                         tty->hw_stopped = 0;
509                         port->IER |= IER_TXRDY;
510                         if (port->xmit_cnt <= port->wakeup_chars)
511                                 tty_wakeup(tty);
512                 } else  {
513                         tty->hw_stopped = 1;
514                         port->IER &= ~IER_TXRDY;
515                 }
516                 rc_out(bp, CD180_IER, port->IER);
517         }
518         if (mcr & MCR_DSRCHG)  {
519                 if (rc_in(bp, CD180_MSVR) & MSVR_DSR)  {
520                         tty->hw_stopped = 0;
521                         port->IER |= IER_TXRDY;
522                         if (port->xmit_cnt <= port->wakeup_chars)
523                                 tty_wakeup(tty);
524                 } else  {
525                         tty->hw_stopped = 1;
526                         port->IER &= ~IER_TXRDY;
527                 }
528                 rc_out(bp, CD180_IER, port->IER);
529         }
530 #endif /* RISCOM_BRAIN_DAMAGED_CTS */
531
532         /* Clear change bits */
533         rc_out(bp, CD180_MCR, 0);
534 }
535
536 /* The main interrupt processing routine */
537 static irqreturn_t rc_interrupt(int dummy, void *dev_id)
538 {
539         unsigned char status;
540         unsigned char ack;
541         struct riscom_board *bp = dev_id;
542         unsigned long loop = 0;
543         int handled = 0;
544
545         if (!(bp->flags & RC_BOARD_ACTIVE))
546                 return IRQ_NONE;
547
548         while ((++loop < 16) && ((status = ~(rc_in(bp, RC_BSR))) &
549                                  (RC_BSR_TOUT | RC_BSR_TINT |
550                                   RC_BSR_MINT | RC_BSR_RINT))) {
551                 handled = 1;
552                 if (status & RC_BSR_TOUT)
553                         printk(KERN_WARNING "rc%d: Got timeout. Hardware "
554                                             "error?\n", board_No(bp));
555                 else if (status & RC_BSR_RINT) {
556                         ack = rc_in(bp, RC_ACK_RINT);
557                         if (ack == (RC_ID | GIVR_IT_RCV))
558                                 rc_receive(bp);
559                         else if (ack == (RC_ID | GIVR_IT_REXC))
560                                 rc_receive_exc(bp);
561                         else
562                                 printk(KERN_WARNING "rc%d: Bad receive ack "
563                                                     "0x%02x.\n",
564                                        board_No(bp), ack);
565                 } else if (status & RC_BSR_TINT) {
566                         ack = rc_in(bp, RC_ACK_TINT);
567                         if (ack == (RC_ID | GIVR_IT_TX))
568                                 rc_transmit(bp);
569                         else
570                                 printk(KERN_WARNING "rc%d: Bad transmit ack "
571                                                     "0x%02x.\n",
572                                        board_No(bp), ack);
573                 } else /* if (status & RC_BSR_MINT) */ {
574                         ack = rc_in(bp, RC_ACK_MINT);
575                         if (ack == (RC_ID | GIVR_IT_MODEM))
576                                 rc_check_modem(bp);
577                         else
578                                 printk(KERN_WARNING "rc%d: Bad modem ack "
579                                                     "0x%02x.\n",
580                                        board_No(bp), ack);
581                 }
582                 rc_out(bp, CD180_EOIR, 0);   /* Mark end of interrupt */
583                 rc_out(bp, RC_CTOUT, 0);     /* Clear timeout flag    */
584         }
585         return IRQ_RETVAL(handled);
586 }
587
588 /*
589  *  Routines for open & close processing.
590  */
591
592 /* Called with disabled interrupts */
593 static int rc_setup_board(struct riscom_board *bp)
594 {
595         int error;
596
597         if (bp->flags & RC_BOARD_ACTIVE)
598                 return 0;
599
600         error = request_irq(bp->irq, rc_interrupt, IRQF_DISABLED,
601                             "RISCom/8", bp);
602         if (error)
603                 return error;
604
605         rc_out(bp, RC_CTOUT, 0);                /* Just in case         */
606         bp->DTR = ~0;
607         rc_out(bp, RC_DTR, bp->DTR);            /* Drop DTR on all ports */
608
609         bp->flags |= RC_BOARD_ACTIVE;
610
611         return 0;
612 }
613
614 /* Called with disabled interrupts */
615 static void rc_shutdown_board(struct riscom_board *bp)
616 {
617         if (!(bp->flags & RC_BOARD_ACTIVE))
618                 return;
619
620         bp->flags &= ~RC_BOARD_ACTIVE;
621
622         free_irq(bp->irq, NULL);
623
624         bp->DTR = ~0;
625         rc_out(bp, RC_DTR, bp->DTR);           /* Drop DTR on all ports */
626
627 }
628
629 /*
630  * Setting up port characteristics.
631  * Must be called with disabled interrupts
632  */
633 static void rc_change_speed(struct riscom_board *bp, struct riscom_port *port)
634 {
635         struct tty_struct *tty = port->port.tty;
636         unsigned long baud;
637         long tmp;
638         unsigned char cor1 = 0, cor3 = 0;
639         unsigned char mcor1 = 0, mcor2 = 0;
640
641         port->IER  = 0;
642         port->COR2 = 0;
643         port->MSVR = MSVR_RTS;
644
645         baud = tty_get_baud_rate(tty);
646
647         /* Select port on the board */
648         rc_out(bp, CD180_CAR, port_No(port));
649
650         if (!baud)  {
651                 /* Drop DTR & exit */
652                 bp->DTR |= (1u << port_No(port));
653                 rc_out(bp, RC_DTR, bp->DTR);
654                 return;
655         } else  {
656                 /* Set DTR on */
657                 bp->DTR &= ~(1u << port_No(port));
658                 rc_out(bp, RC_DTR, bp->DTR);
659         }
660
661         /*
662          * Now we must calculate some speed depended things
663          */
664
665         /* Set baud rate for port */
666         tmp = (((RC_OSCFREQ + baud/2) / baud +
667                 CD180_TPC/2) / CD180_TPC);
668
669         rc_out(bp, CD180_RBPRH, (tmp >> 8) & 0xff);
670         rc_out(bp, CD180_TBPRH, (tmp >> 8) & 0xff);
671         rc_out(bp, CD180_RBPRL, tmp & 0xff);
672         rc_out(bp, CD180_TBPRL, tmp & 0xff);
673
674         baud = (baud + 5) / 10;   /* Estimated CPS */
675
676         /* Two timer ticks seems enough to wakeup something like SLIP driver */
677         tmp = ((baud + HZ/2) / HZ) * 2 - CD180_NFIFO;
678         port->wakeup_chars = (tmp < 0) ? 0 : ((tmp >= SERIAL_XMIT_SIZE) ?
679                                               SERIAL_XMIT_SIZE - 1 : tmp);
680
681         /* Receiver timeout will be transmission time for 1.5 chars */
682         tmp = (RISCOM_TPS + RISCOM_TPS/2 + baud/2) / baud;
683         tmp = (tmp > 0xff) ? 0xff : tmp;
684         rc_out(bp, CD180_RTPR, tmp);
685
686         switch (C_CSIZE(tty)) {
687         case CS5:
688                 cor1 |= COR1_5BITS;
689                 break;
690         case CS6:
691                 cor1 |= COR1_6BITS;
692                 break;
693         case CS7:
694                 cor1 |= COR1_7BITS;
695                 break;
696         case CS8:
697                 cor1 |= COR1_8BITS;
698                 break;
699         }
700         if (C_CSTOPB(tty))
701                 cor1 |= COR1_2SB;
702
703         cor1 |= COR1_IGNORE;
704         if (C_PARENB(tty)) {
705                 cor1 |= COR1_NORMPAR;
706                 if (C_PARODD(tty))
707                         cor1 |= COR1_ODDP;
708                 if (I_INPCK(tty))
709                         cor1 &= ~COR1_IGNORE;
710         }
711         /* Set marking of some errors */
712         port->mark_mask = RCSR_OE | RCSR_TOUT;
713         if (I_INPCK(tty))
714                 port->mark_mask |= RCSR_FE | RCSR_PE;
715         if (I_BRKINT(tty) || I_PARMRK(tty))
716                 port->mark_mask |= RCSR_BREAK;
717         if (I_IGNPAR(tty))
718                 port->mark_mask &= ~(RCSR_FE | RCSR_PE);
719         if (I_IGNBRK(tty)) {
720                 port->mark_mask &= ~RCSR_BREAK;
721                 if (I_IGNPAR(tty))
722                         /* Real raw mode. Ignore all */
723                         port->mark_mask &= ~RCSR_OE;
724         }
725         /* Enable Hardware Flow Control */
726         if (C_CRTSCTS(tty))  {
727 #ifdef RISCOM_BRAIN_DAMAGED_CTS
728                 port->IER |= IER_DSR | IER_CTS;
729                 mcor1 |= MCOR1_DSRZD | MCOR1_CTSZD;
730                 mcor2 |= MCOR2_DSROD | MCOR2_CTSOD;
731                 tty->hw_stopped = !(rc_in(bp, CD180_MSVR) &
732                                                 (MSVR_CTS|MSVR_DSR));
733 #else
734                 port->COR2 |= COR2_CTSAE;
735 #endif
736         }
737         /* Enable Software Flow Control. FIXME: I'm not sure about this */
738         /* Some people reported that it works, but I still doubt */
739         if (I_IXON(tty))  {
740                 port->COR2 |= COR2_TXIBE;
741                 cor3 |= (COR3_FCT | COR3_SCDE);
742                 if (I_IXANY(tty))
743                         port->COR2 |= COR2_IXM;
744                 rc_out(bp, CD180_SCHR1, START_CHAR(tty));
745                 rc_out(bp, CD180_SCHR2, STOP_CHAR(tty));
746                 rc_out(bp, CD180_SCHR3, START_CHAR(tty));
747                 rc_out(bp, CD180_SCHR4, STOP_CHAR(tty));
748         }
749         if (!C_CLOCAL(tty))  {
750                 /* Enable CD check */
751                 port->IER |= IER_CD;
752                 mcor1 |= MCOR1_CDZD;
753                 mcor2 |= MCOR2_CDOD;
754         }
755
756         if (C_CREAD(tty))
757                 /* Enable receiver */
758                 port->IER |= IER_RXD;
759
760         /* Set input FIFO size (1-8 bytes) */
761         cor3 |= RISCOM_RXFIFO;
762         /* Setting up CD180 channel registers */
763         rc_out(bp, CD180_COR1, cor1);
764         rc_out(bp, CD180_COR2, port->COR2);
765         rc_out(bp, CD180_COR3, cor3);
766         /* Make CD180 know about registers change */
767         rc_wait_CCR(bp);
768         rc_out(bp, CD180_CCR, CCR_CORCHG1 | CCR_CORCHG2 | CCR_CORCHG3);
769         /* Setting up modem option registers */
770         rc_out(bp, CD180_MCOR1, mcor1);
771         rc_out(bp, CD180_MCOR2, mcor2);
772         /* Enable CD180 transmitter & receiver */
773         rc_wait_CCR(bp);
774         rc_out(bp, CD180_CCR, CCR_TXEN | CCR_RXEN);
775         /* Enable interrupts */
776         rc_out(bp, CD180_IER, port->IER);
777         /* And finally set RTS on */
778         rc_out(bp, CD180_MSVR, port->MSVR);
779 }
780
781 /* Must be called with interrupts enabled */
782 static int rc_setup_port(struct riscom_board *bp, struct riscom_port *port)
783 {
784         unsigned long flags;
785
786         if (port->port.flags & ASYNC_INITIALIZED)
787                 return 0;
788
789         if (tty_port_alloc_xmit_buf(&port->port) < 0)
790                 return -ENOMEM;
791
792         spin_lock_irqsave(&riscom_lock, flags);
793
794         clear_bit(TTY_IO_ERROR, &port->port.tty->flags);
795         if (port->port.count == 1)
796                 bp->count++;
797         port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
798         rc_change_speed(bp, port);
799         port->port.flags |= ASYNC_INITIALIZED;
800
801         spin_unlock_irqrestore(&riscom_lock, flags);
802         return 0;
803 }
804
805 /* Must be called with interrupts disabled */
806 static void rc_shutdown_port(struct tty_struct *tty,
807                         struct riscom_board *bp, struct riscom_port *port)
808 {
809         if (!(port->port.flags & ASYNC_INITIALIZED))
810                 return;
811
812 #ifdef RC_REPORT_OVERRUN
813         printk(KERN_INFO "rc%d: port %d: Total %ld overruns were detected.\n",
814                board_No(bp), port_No(port), port->overrun);
815 #endif
816 #ifdef RC_REPORT_FIFO
817         {
818                 int i;
819
820                 printk(KERN_INFO "rc%d: port %d: FIFO hits [ ",
821                        board_No(bp), port_No(port));
822                 for (i = 0; i < 10; i++)
823                         printk("%ld ", port->hits[i]);
824                 printk("].\n");
825         }
826 #endif
827         tty_port_free_xmit_buf(&port->port);
828         if (C_HUPCL(tty)) {
829                 /* Drop DTR */
830                 bp->DTR |= (1u << port_No(port));
831                 rc_out(bp, RC_DTR, bp->DTR);
832         }
833
834         /* Select port */
835         rc_out(bp, CD180_CAR, port_No(port));
836         /* Reset port */
837         rc_wait_CCR(bp);
838         rc_out(bp, CD180_CCR, CCR_SOFTRESET);
839         /* Disable all interrupts from this port */
840         port->IER = 0;
841         rc_out(bp, CD180_IER, port->IER);
842
843         set_bit(TTY_IO_ERROR, &tty->flags);
844         port->port.flags &= ~ASYNC_INITIALIZED;
845
846         if (--bp->count < 0)  {
847                 printk(KERN_INFO "rc%d: rc_shutdown_port: "
848                                  "bad board count: %d\n",
849                        board_No(bp), bp->count);
850                 bp->count = 0;
851         }
852         /*
853          * If this is the last opened port on the board
854          * shutdown whole board
855          */
856         if (!bp->count)
857                 rc_shutdown_board(bp);
858 }
859
860 static int carrier_raised(struct tty_port *port)
861 {
862         struct riscom_port *p = container_of(port, struct riscom_port, port);
863         struct riscom_board *bp = port_Board(p);
864         unsigned long flags;
865         int CD;
866         
867         spin_lock_irqsave(&riscom_lock, flags);
868         rc_out(bp, CD180_CAR, port_No(p));
869         CD = rc_in(bp, CD180_MSVR) & MSVR_CD;
870         rc_out(bp, CD180_MSVR, MSVR_RTS);
871         bp->DTR &= ~(1u << port_No(p));
872         rc_out(bp, RC_DTR, bp->DTR);
873         spin_unlock_irqrestore(&riscom_lock, flags);
874         return CD;
875 }
876
877 static int rc_open(struct tty_struct *tty, struct file *filp)
878 {
879         int board;
880         int error;
881         struct riscom_port *port;
882         struct riscom_board *bp;
883
884         board = RC_BOARD(tty->index);
885         if (board >= RC_NBOARD || !(rc_board[board].flags & RC_BOARD_PRESENT))
886                 return -ENODEV;
887
888         bp = &rc_board[board];
889         port = rc_port + board * RC_NPORT + RC_PORT(tty->index);
890         if (rc_paranoia_check(port, tty->name, "rc_open"))
891                 return -ENODEV;
892
893         error = rc_setup_board(bp);
894         if (error)
895                 return error;
896
897         port->port.count++;
898         tty->driver_data = port;
899         port->port.tty = tty;
900
901         error = rc_setup_port(bp, port);
902         if (error == 0)
903                 error = tty_port_block_til_ready(&port->port, tty, filp);
904         return error;
905 }
906
907 static void rc_flush_buffer(struct tty_struct *tty)
908 {
909         struct riscom_port *port = tty->driver_data;
910         unsigned long flags;
911
912         if (rc_paranoia_check(port, tty->name, "rc_flush_buffer"))
913                 return;
914
915         spin_lock_irqsave(&riscom_lock, flags);
916         port->xmit_cnt = port->xmit_head = port->xmit_tail = 0;
917         spin_unlock_irqrestore(&riscom_lock, flags);
918
919         tty_wakeup(tty);
920 }
921
922 static void rc_close(struct tty_struct *tty, struct file *filp)
923 {
924         struct riscom_port *port = tty->driver_data;
925         struct riscom_board *bp;
926         unsigned long flags;
927         unsigned long timeout;
928
929         if (!port || rc_paranoia_check(port, tty->name, "close"))
930                 return;
931
932         bp = port_Board(port);
933         
934         if (tty_port_close_start(&port->port, tty, filp) == 0)
935                 return;
936         
937         /*
938          * At this point we stop accepting input.  To do this, we
939          * disable the receive line status interrupts, and tell the
940          * interrupt driver to stop checking the data ready bit in the
941          * line status register.
942          */
943
944         spin_lock_irqsave(&riscom_lock, flags);
945         port->IER &= ~IER_RXD;
946         if (port->port.flags & ASYNC_INITIALIZED) {
947                 port->IER &= ~IER_TXRDY;
948                 port->IER |= IER_TXEMPTY;
949                 rc_out(bp, CD180_CAR, port_No(port));
950                 rc_out(bp, CD180_IER, port->IER);
951                 /*
952                  * Before we drop DTR, make sure the UART transmitter
953                  * has completely drained; this is especially
954                  * important if there is a transmit FIFO!
955                  */
956                 timeout = jiffies + HZ;
957                 while (port->IER & IER_TXEMPTY) {
958                         spin_unlock_irqrestore(&riscom_lock, flags);
959                         msleep_interruptible(jiffies_to_msecs(port->timeout));
960                         spin_lock_irqsave(&riscom_lock, flags);
961                         if (time_after(jiffies, timeout))
962                                 break;
963                 }
964         }
965         rc_shutdown_port(tty, bp, port);
966         rc_flush_buffer(tty);
967         spin_unlock_irqrestore(&riscom_lock, flags);
968
969         tty_port_close_end(&port->port, tty);
970 }
971
972 static int rc_write(struct tty_struct *tty,
973                     const unsigned char *buf, int count)
974 {
975         struct riscom_port *port = tty->driver_data;
976         struct riscom_board *bp;
977         int c, total = 0;
978         unsigned long flags;
979
980         if (rc_paranoia_check(port, tty->name, "rc_write"))
981                 return 0;
982
983         bp = port_Board(port);
984
985         while (1) {
986                 spin_lock_irqsave(&riscom_lock, flags);
987
988                 c = min_t(int, count, min(SERIAL_XMIT_SIZE - port->xmit_cnt - 1,
989                                           SERIAL_XMIT_SIZE - port->xmit_head));
990                 if (c <= 0)
991                         break;  /* lock continues to be held */
992
993                 memcpy(port->port.xmit_buf + port->xmit_head, buf, c);
994                 port->xmit_head = (port->xmit_head + c) & (SERIAL_XMIT_SIZE-1);
995                 port->xmit_cnt += c;
996
997                 spin_unlock_irqrestore(&riscom_lock, flags);
998
999                 buf += c;
1000                 count -= c;
1001                 total += c;
1002         }
1003
1004         if (port->xmit_cnt && !tty->stopped && !tty->hw_stopped &&
1005             !(port->IER & IER_TXRDY)) {
1006                 port->IER |= IER_TXRDY;
1007                 rc_out(bp, CD180_CAR, port_No(port));
1008                 rc_out(bp, CD180_IER, port->IER);
1009         }
1010
1011         spin_unlock_irqrestore(&riscom_lock, flags);
1012
1013         return total;
1014 }
1015
1016 static int rc_put_char(struct tty_struct *tty, unsigned char ch)
1017 {
1018         struct riscom_port *port = tty->driver_data;
1019         unsigned long flags;
1020         int ret = 0;
1021
1022         if (rc_paranoia_check(port, tty->name, "rc_put_char"))
1023                 return 0;
1024
1025         spin_lock_irqsave(&riscom_lock, flags);
1026
1027         if (port->xmit_cnt >= SERIAL_XMIT_SIZE - 1)
1028                 goto out;
1029
1030         port->port.xmit_buf[port->xmit_head++] = ch;
1031         port->xmit_head &= SERIAL_XMIT_SIZE - 1;
1032         port->xmit_cnt++;
1033         ret = 1;
1034
1035 out:
1036         spin_unlock_irqrestore(&riscom_lock, flags);
1037         return ret;
1038 }
1039
1040 static void rc_flush_chars(struct tty_struct *tty)
1041 {
1042         struct riscom_port *port = tty->driver_data;
1043         unsigned long flags;
1044
1045         if (rc_paranoia_check(port, tty->name, "rc_flush_chars"))
1046                 return;
1047
1048         if (port->xmit_cnt <= 0 || tty->stopped || tty->hw_stopped)
1049                 return;
1050
1051         spin_lock_irqsave(&riscom_lock, flags);
1052
1053         port->IER |= IER_TXRDY;
1054         rc_out(port_Board(port), CD180_CAR, port_No(port));
1055         rc_out(port_Board(port), CD180_IER, port->IER);
1056
1057         spin_unlock_irqrestore(&riscom_lock, flags);
1058 }
1059
1060 static int rc_write_room(struct tty_struct *tty)
1061 {
1062         struct riscom_port *port = tty->driver_data;
1063         int     ret;
1064
1065         if (rc_paranoia_check(port, tty->name, "rc_write_room"))
1066                 return 0;
1067
1068         ret = SERIAL_XMIT_SIZE - port->xmit_cnt - 1;
1069         if (ret < 0)
1070                 ret = 0;
1071         return ret;
1072 }
1073
1074 static int rc_chars_in_buffer(struct tty_struct *tty)
1075 {
1076         struct riscom_port *port = tty->driver_data;
1077
1078         if (rc_paranoia_check(port, tty->name, "rc_chars_in_buffer"))
1079                 return 0;
1080
1081         return port->xmit_cnt;
1082 }
1083
1084 static int rc_tiocmget(struct tty_struct *tty, struct file *file)
1085 {
1086         struct riscom_port *port = tty->driver_data;
1087         struct riscom_board *bp;
1088         unsigned char status;
1089         unsigned int result;
1090         unsigned long flags;
1091
1092         if (rc_paranoia_check(port, tty->name, __func__))
1093                 return -ENODEV;
1094
1095         bp = port_Board(port);
1096
1097         spin_lock_irqsave(&riscom_lock, flags);
1098
1099         rc_out(bp, CD180_CAR, port_No(port));
1100         status = rc_in(bp, CD180_MSVR);
1101         result = rc_in(bp, RC_RI) & (1u << port_No(port)) ? 0 : TIOCM_RNG;
1102
1103         spin_unlock_irqrestore(&riscom_lock, flags);
1104
1105         result |= ((status & MSVR_RTS) ? TIOCM_RTS : 0)
1106                 | ((status & MSVR_DTR) ? TIOCM_DTR : 0)
1107                 | ((status & MSVR_CD)  ? TIOCM_CAR : 0)
1108                 | ((status & MSVR_DSR) ? TIOCM_DSR : 0)
1109                 | ((status & MSVR_CTS) ? TIOCM_CTS : 0);
1110         return result;
1111 }
1112
1113 static int rc_tiocmset(struct tty_struct *tty, struct file *file,
1114                        unsigned int set, unsigned int clear)
1115 {
1116         struct riscom_port *port = tty->driver_data;
1117         unsigned long flags;
1118         struct riscom_board *bp;
1119
1120         if (rc_paranoia_check(port, tty->name, __func__))
1121                 return -ENODEV;
1122
1123         bp = port_Board(port);
1124
1125         spin_lock_irqsave(&riscom_lock, flags);
1126
1127         if (set & TIOCM_RTS)
1128                 port->MSVR |= MSVR_RTS;
1129         if (set & TIOCM_DTR)
1130                 bp->DTR &= ~(1u << port_No(port));
1131
1132         if (clear & TIOCM_RTS)
1133                 port->MSVR &= ~MSVR_RTS;
1134         if (clear & TIOCM_DTR)
1135                 bp->DTR |= (1u << port_No(port));
1136
1137         rc_out(bp, CD180_CAR, port_No(port));
1138         rc_out(bp, CD180_MSVR, port->MSVR);
1139         rc_out(bp, RC_DTR, bp->DTR);
1140
1141         spin_unlock_irqrestore(&riscom_lock, flags);
1142
1143         return 0;
1144 }
1145
1146 static int rc_send_break(struct tty_struct *tty, int length)
1147 {
1148         struct riscom_port *port = tty->driver_data;
1149         struct riscom_board *bp = port_Board(port);
1150         unsigned long flags;
1151
1152         if (length == 0 || length == -1)
1153                 return -EOPNOTSUPP;
1154
1155         spin_lock_irqsave(&riscom_lock, flags);
1156
1157         port->break_length = RISCOM_TPS / HZ * length;
1158         port->COR2 |= COR2_ETC;
1159         port->IER  |= IER_TXRDY;
1160         rc_out(bp, CD180_CAR, port_No(port));
1161         rc_out(bp, CD180_COR2, port->COR2);
1162         rc_out(bp, CD180_IER, port->IER);
1163         rc_wait_CCR(bp);
1164         rc_out(bp, CD180_CCR, CCR_CORCHG2);
1165         rc_wait_CCR(bp);
1166
1167         spin_unlock_irqrestore(&riscom_lock, flags);
1168         return 0;
1169 }
1170
1171 static int rc_set_serial_info(struct riscom_port *port,
1172                                      struct serial_struct __user *newinfo)
1173 {
1174         struct serial_struct tmp;
1175         struct riscom_board *bp = port_Board(port);
1176         int change_speed;
1177
1178         if (copy_from_user(&tmp, newinfo, sizeof(tmp)))
1179                 return -EFAULT;
1180
1181 #if 0
1182         if ((tmp.irq != bp->irq) ||
1183             (tmp.port != bp->base) ||
1184             (tmp.type != PORT_CIRRUS) ||
1185             (tmp.baud_base != (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC) ||
1186             (tmp.custom_divisor != 0) ||
1187             (tmp.xmit_fifo_size != CD180_NFIFO) ||
1188             (tmp.flags & ~RISCOM_LEGAL_FLAGS))
1189                 return -EINVAL;
1190 #endif
1191
1192         change_speed = ((port->port.flags & ASYNC_SPD_MASK) !=
1193                         (tmp.flags & ASYNC_SPD_MASK));
1194
1195         if (!capable(CAP_SYS_ADMIN)) {
1196                 if ((tmp.close_delay != port->port.close_delay) ||
1197                     (tmp.closing_wait != port->port.closing_wait) ||
1198                     ((tmp.flags & ~ASYNC_USR_MASK) !=
1199                      (port->port.flags & ~ASYNC_USR_MASK)))
1200                         return -EPERM;
1201                 port->port.flags = ((port->port.flags & ~ASYNC_USR_MASK) |
1202                                (tmp.flags & ASYNC_USR_MASK));
1203         } else  {
1204                 port->port.flags = ((port->port.flags & ~ASYNC_FLAGS) |
1205                                (tmp.flags & ASYNC_FLAGS));
1206                 port->port.close_delay = tmp.close_delay;
1207                 port->port.closing_wait = tmp.closing_wait;
1208         }
1209         if (change_speed)  {
1210                 unsigned long flags;
1211
1212                 spin_lock_irqsave(&riscom_lock, flags);
1213                 rc_change_speed(bp, port);
1214                 spin_unlock_irqrestore(&riscom_lock, flags);
1215         }
1216         return 0;
1217 }
1218
1219 static int rc_get_serial_info(struct riscom_port *port,
1220                                      struct serial_struct __user *retinfo)
1221 {
1222         struct serial_struct tmp;
1223         struct riscom_board *bp = port_Board(port);
1224
1225         memset(&tmp, 0, sizeof(tmp));
1226         tmp.type = PORT_CIRRUS;
1227         tmp.line = port - rc_port;
1228         tmp.port = bp->base;
1229         tmp.irq  = bp->irq;
1230         tmp.flags = port->port.flags;
1231         tmp.baud_base = (RC_OSCFREQ + CD180_TPC/2) / CD180_TPC;
1232         tmp.close_delay = port->port.close_delay * HZ/100;
1233         tmp.closing_wait = port->port.closing_wait * HZ/100;
1234         tmp.xmit_fifo_size = CD180_NFIFO;
1235         return copy_to_user(retinfo, &tmp, sizeof(tmp)) ? -EFAULT : 0;
1236 }
1237
1238 static int rc_ioctl(struct tty_struct *tty, struct file *filp,
1239                     unsigned int cmd, unsigned long arg)
1240 {
1241         struct riscom_port *port = tty->driver_data;
1242         void __user *argp = (void __user *)arg;
1243         int retval;
1244
1245         if (rc_paranoia_check(port, tty->name, "rc_ioctl"))
1246                 return -ENODEV;
1247
1248         switch (cmd) {
1249         case TIOCGSERIAL:
1250                 lock_kernel();
1251                 retval = rc_get_serial_info(port, argp);
1252                 unlock_kernel();
1253                 break;
1254         case TIOCSSERIAL:
1255                 lock_kernel();
1256                 retval = rc_set_serial_info(port, argp);
1257                 unlock_kernel();
1258                 break;
1259         default:
1260                 retval = -ENOIOCTLCMD;
1261         }
1262         return retval;
1263 }
1264
1265 static void rc_throttle(struct tty_struct *tty)
1266 {
1267         struct riscom_port *port = tty->driver_data;
1268         struct riscom_board *bp;
1269         unsigned long flags;
1270
1271         if (rc_paranoia_check(port, tty->name, "rc_throttle"))
1272                 return;
1273         bp = port_Board(port);
1274
1275         spin_lock_irqsave(&riscom_lock, flags);
1276         port->MSVR &= ~MSVR_RTS;
1277         rc_out(bp, CD180_CAR, port_No(port));
1278         if (I_IXOFF(tty)) {
1279                 rc_wait_CCR(bp);
1280                 rc_out(bp, CD180_CCR, CCR_SSCH2);
1281                 rc_wait_CCR(bp);
1282         }
1283         rc_out(bp, CD180_MSVR, port->MSVR);
1284         spin_unlock_irqrestore(&riscom_lock, flags);
1285 }
1286
1287 static void rc_unthrottle(struct tty_struct *tty)
1288 {
1289         struct riscom_port *port = tty->driver_data;
1290         struct riscom_board *bp;
1291         unsigned long flags;
1292
1293         if (rc_paranoia_check(port, tty->name, "rc_unthrottle"))
1294                 return;
1295         bp = port_Board(port);
1296
1297         spin_lock_irqsave(&riscom_lock, flags);
1298         port->MSVR |= MSVR_RTS;
1299         rc_out(bp, CD180_CAR, port_No(port));
1300         if (I_IXOFF(tty))  {
1301                 rc_wait_CCR(bp);
1302                 rc_out(bp, CD180_CCR, CCR_SSCH1);
1303                 rc_wait_CCR(bp);
1304         }
1305         rc_out(bp, CD180_MSVR, port->MSVR);
1306         spin_unlock_irqrestore(&riscom_lock, flags);
1307 }
1308
1309 static void rc_stop(struct tty_struct *tty)
1310 {
1311         struct riscom_port *port = tty->driver_data;
1312         struct riscom_board *bp;
1313         unsigned long flags;
1314
1315         if (rc_paranoia_check(port, tty->name, "rc_stop"))
1316                 return;
1317
1318         bp = port_Board(port);
1319
1320         spin_lock_irqsave(&riscom_lock, flags);
1321         port->IER &= ~IER_TXRDY;
1322         rc_out(bp, CD180_CAR, port_No(port));
1323         rc_out(bp, CD180_IER, port->IER);
1324         spin_unlock_irqrestore(&riscom_lock, flags);
1325 }
1326
1327 static void rc_start(struct tty_struct *tty)
1328 {
1329         struct riscom_port *port = tty->driver_data;
1330         struct riscom_board *bp;
1331         unsigned long flags;
1332
1333         if (rc_paranoia_check(port, tty->name, "rc_start"))
1334                 return;
1335
1336         bp = port_Board(port);
1337
1338         spin_lock_irqsave(&riscom_lock, flags);
1339
1340         if (port->xmit_cnt && port->port.xmit_buf && !(port->IER & IER_TXRDY)) {
1341                 port->IER |= IER_TXRDY;
1342                 rc_out(bp, CD180_CAR, port_No(port));
1343                 rc_out(bp, CD180_IER, port->IER);
1344         }
1345         spin_unlock_irqrestore(&riscom_lock, flags);
1346 }
1347
1348 static void rc_hangup(struct tty_struct *tty)
1349 {
1350         struct riscom_port *port = tty->driver_data;
1351         struct riscom_board *bp;
1352         unsigned long flags;
1353
1354         if (rc_paranoia_check(port, tty->name, "rc_hangup"))
1355                 return;
1356
1357         bp = port_Board(port);
1358
1359         rc_shutdown_port(tty, bp, port);
1360         spin_lock_irqsave(&port->port.lock, flags);
1361         port->port.count = 0;
1362         port->port.flags &= ~ASYNC_NORMAL_ACTIVE;
1363         port->port.tty = NULL;
1364         wake_up_interruptible(&port->port.open_wait);
1365         spin_unlock_irqrestore(&port->port.lock, flags);
1366 }
1367
1368 static void rc_set_termios(struct tty_struct *tty,
1369                                         struct ktermios *old_termios)
1370 {
1371         struct riscom_port *port = tty->driver_data;
1372         unsigned long flags;
1373
1374         if (rc_paranoia_check(port, tty->name, "rc_set_termios"))
1375                 return;
1376
1377         spin_lock_irqsave(&riscom_lock, flags);
1378         rc_change_speed(port_Board(port), port);
1379         spin_unlock_irqrestore(&riscom_lock, flags);
1380
1381         if ((old_termios->c_cflag & CRTSCTS) &&
1382             !(tty->termios->c_cflag & CRTSCTS)) {
1383                 tty->hw_stopped = 0;
1384                 rc_start(tty);
1385         }
1386 }
1387
1388 static const struct tty_operations riscom_ops = {
1389         .open  = rc_open,
1390         .close = rc_close,
1391         .write = rc_write,
1392         .put_char = rc_put_char,
1393         .flush_chars = rc_flush_chars,
1394         .write_room = rc_write_room,
1395         .chars_in_buffer = rc_chars_in_buffer,
1396         .flush_buffer = rc_flush_buffer,
1397         .ioctl = rc_ioctl,
1398         .throttle = rc_throttle,
1399         .unthrottle = rc_unthrottle,
1400         .set_termios = rc_set_termios,
1401         .stop = rc_stop,
1402         .start = rc_start,
1403         .hangup = rc_hangup,
1404         .tiocmget = rc_tiocmget,
1405         .tiocmset = rc_tiocmset,
1406         .break_ctl = rc_send_break,
1407 };
1408
1409 static const struct tty_port_operations riscom_port_ops = {
1410         .carrier_raised = carrier_raised,
1411 };
1412
1413
1414 static int __init rc_init_drivers(void)
1415 {
1416         int error;
1417         int i;
1418
1419         riscom_driver = alloc_tty_driver(RC_NBOARD * RC_NPORT);
1420         if (!riscom_driver)
1421                 return -ENOMEM;
1422
1423         riscom_driver->owner = THIS_MODULE;
1424         riscom_driver->name = "ttyL";
1425         riscom_driver->major = RISCOM8_NORMAL_MAJOR;
1426         riscom_driver->type = TTY_DRIVER_TYPE_SERIAL;
1427         riscom_driver->subtype = SERIAL_TYPE_NORMAL;
1428         riscom_driver->init_termios = tty_std_termios;
1429         riscom_driver->init_termios.c_cflag =
1430                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
1431         riscom_driver->init_termios.c_ispeed = 9600;
1432         riscom_driver->init_termios.c_ospeed = 9600;
1433         riscom_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_HARDWARE_BREAK;
1434         tty_set_operations(riscom_driver, &riscom_ops);
1435         error = tty_register_driver(riscom_driver);
1436         if (error != 0) {
1437                 put_tty_driver(riscom_driver);
1438                 printk(KERN_ERR "rc: Couldn't register RISCom/8 driver, "
1439                                 "error = %d\n", error);
1440                 return 1;
1441         }
1442         memset(rc_port, 0, sizeof(rc_port));
1443         for (i = 0; i < RC_NPORT * RC_NBOARD; i++)  {
1444                 tty_port_init(&rc_port[i].port);
1445                 rc_port[i].port.ops = &riscom_port_ops;
1446                 rc_port[i].magic = RISCOM8_MAGIC;
1447         }
1448         return 0;
1449 }
1450
1451 static void rc_release_drivers(void)
1452 {
1453         tty_unregister_driver(riscom_driver);
1454         put_tty_driver(riscom_driver);
1455 }
1456
1457 #ifndef MODULE
1458 /*
1459  * Called at boot time.
1460  *
1461  * You can specify IO base for up to RC_NBOARD cards,
1462  * using line "riscom8=0xiobase1,0xiobase2,.." at LILO prompt.
1463  * Note that there will be no probing at default
1464  * addresses in this case.
1465  *
1466  */
1467 static int __init riscom8_setup(char *str)
1468 {
1469         int ints[RC_NBOARD];
1470         int i;
1471
1472         str = get_options(str, ARRAY_SIZE(ints), ints);
1473
1474         for (i = 0; i < RC_NBOARD; i++) {
1475                 if (i < ints[0])
1476                         rc_board[i].base = ints[i+1];
1477                 else
1478                         rc_board[i].base = 0;
1479         }
1480         return 1;
1481 }
1482
1483 __setup("riscom8=", riscom8_setup);
1484 #endif
1485
1486 static char banner[] __initdata =
1487         KERN_INFO "rc: SDL RISCom/8 card driver v1.1, (c) D.Gorodchanin "
1488                   "1994-1996.\n";
1489 static char no_boards_msg[] __initdata =
1490         KERN_INFO "rc: No RISCom/8 boards detected.\n";
1491
1492 /*
1493  * This routine must be called by kernel at boot time
1494  */
1495 static int __init riscom8_init(void)
1496 {
1497         int i;
1498         int found = 0;
1499
1500         printk(banner);
1501
1502         if (rc_init_drivers())
1503                 return -EIO;
1504
1505         for (i = 0; i < RC_NBOARD; i++)
1506                 if (rc_board[i].base && !rc_probe(&rc_board[i]))
1507                         found++;
1508         if (!found)  {
1509                 rc_release_drivers();
1510                 printk(no_boards_msg);
1511                 return -EIO;
1512         }
1513         return 0;
1514 }
1515
1516 #ifdef MODULE
1517 static int iobase;
1518 static int iobase1;
1519 static int iobase2;
1520 static int iobase3;
1521 module_param(iobase, int, 0);
1522 module_param(iobase1, int, 0);
1523 module_param(iobase2, int, 0);
1524 module_param(iobase3, int, 0);
1525
1526 MODULE_LICENSE("GPL");
1527 #endif /* MODULE */
1528
1529 /*
1530  * You can setup up to 4 boards (current value of RC_NBOARD)
1531  * by specifying "iobase=0xXXX iobase1=0xXXX ..." as insmod parameter.
1532  *
1533  */
1534 static int __init riscom8_init_module(void)
1535 {
1536 #ifdef MODULE
1537         int i;
1538
1539         if (iobase || iobase1 || iobase2 || iobase3) {
1540                 for (i = 0; i < RC_NBOARD; i++)
1541                         rc_board[i].base = 0;
1542         }
1543
1544         if (iobase)
1545                 rc_board[0].base = iobase;
1546         if (iobase1)
1547                 rc_board[1].base = iobase1;
1548         if (iobase2)
1549                 rc_board[2].base = iobase2;
1550         if (iobase3)
1551                 rc_board[3].base = iobase3;
1552 #endif /* MODULE */
1553
1554         return riscom8_init();
1555 }
1556
1557 static void __exit riscom8_exit_module(void)
1558 {
1559         int i;
1560
1561         rc_release_drivers();
1562         for (i = 0; i < RC_NBOARD; i++)
1563                 if (rc_board[i].flags & RC_BOARD_PRESENT)
1564                         rc_release_io_range(&rc_board[i]);
1565
1566 }
1567
1568 module_init(riscom8_init_module);
1569 module_exit(riscom8_exit_module);