[PATCH] hpet: fix HPET_INFO calls from kernel space
[linux-2.6] / drivers / char / ser_a2232.c
1 /* drivers/char/ser_a2232.c */
2
3 /* $Id: ser_a2232.c,v 0.4 2000/01/25 12:00:00 ehaase Exp $ */
4
5 /* Linux serial driver for the Amiga A2232 board */
6
7 /* This driver is MAINTAINED. Before applying any changes, please contact
8  * the author.
9  */
10
11 /* Copyright (c) 2000-2001 Enver Haase    <ehaase@inf.fu-berlin.de>
12  *                   alias The A2232 driver project <A2232@gmx.net>
13  * All rights reserved.
14  *
15  *   This program is free software; you can redistribute it and/or modify
16  *   it under the terms of the GNU General Public License as published by
17  *   the Free Software Foundation; either version 2 of the License, or
18  *   (at your option) any later version.
19  *
20  *   This program is distributed in the hope that it will be useful,
21  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
22  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
23  *   GNU General Public License for more details.
24  *
25  *   You should have received a copy of the GNU General Public License
26  *   along with this program; if not, write to the Free Software
27  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28  *
29  */
30 /***************************** Documentation ************************/
31 /*
32  * This driver is in EXPERIMENTAL state. That means I could not find
33  * someone with five A2232 boards with 35 ports running at 19200 bps
34  * at the same time and test the machine's behaviour.
35  * However, I know that you can performance-tweak this driver (see
36  * the source code).
37  * One thing to consider is the time this driver consumes during the
38  * Amiga's vertical blank interrupt. Everything that is to be done
39  * _IS DONE_ when entering the vertical blank interrupt handler of
40  * this driver.
41  * However, it would be more sane to only do the job for only ONE card
42  * instead of ALL cards at a time; or, more generally, to handle only
43  * SOME ports instead of ALL ports at a time.
44  * However, as long as no-one runs into problems I guess I shouldn't
45  * change the driver as it runs fine for me :) .
46  *
47  * Version history of this file:
48  * 0.4  Resolved licensing issues.
49  * 0.3  Inclusion in the Linux/m68k tree, small fixes.
50  * 0.2  Added documentation, minor typo fixes.
51  * 0.1  Initial release.
52  *
53  * TO DO:
54  * -    Handle incoming BREAK events. I guess "Stevens: Advanced
55  *      Programming in the UNIX(R) Environment" is a good reference
56  *      on what is to be done.
57  * -    When installing as a module, don't simply 'printk' text, but
58  *      send it to the TTY used by the user.
59  *
60  * THANKS TO:
61  * -    Jukka Marin (65EC02 code).
62  * -    The other NetBSD developers on whose A2232 driver I had a
63  *      pretty close look. However, I didn't copy any code so it
64  *      is okay to put my code under the GPL and include it into
65  *      Linux.
66  */
67 /***************************** End of Documentation *****************/
68
69 /***************************** Defines ******************************/
70 /*
71  * Enables experimental 115200 (normal) 230400 (turbo) baud rate.
72  * The A2232 specification states it can only operate at speeds up to
73  * 19200 bits per second, and I was not able to send a file via
74  * "sz"/"rz" and a null-modem cable from one A2232 port to another
75  * at 115200 bits per second.
76  * However, this might work for you.
77  */
78 #undef A2232_SPEEDHACK
79 /*
80  * Default is not to use RTS/CTS so you could be talked to death.
81  */
82 #define A2232_SUPPRESS_RTSCTS_WARNING
83 /************************* End of Defines ***************************/
84
85 /***************************** Includes *****************************/
86 #include <linux/module.h>
87
88 #include <linux/types.h>
89 #include <linux/sched.h>
90 #include <linux/interrupt.h>
91 #include <linux/kernel.h>
92 #include <linux/errno.h>
93 #include <linux/tty.h>
94
95 #include <asm/setup.h>
96 #include <asm/amigaints.h>
97 #include <asm/amigahw.h>
98 #include <linux/zorro.h>
99 #include <asm/irq.h>
100 #include <asm/semaphore.h>
101
102 #include <linux/delay.h>
103
104 #include <linux/serial.h>
105 #include <linux/generic_serial.h>
106
107 #include "ser_a2232.h"
108 #include "ser_a2232fw.h"
109 /************************* End of Includes **************************/
110
111 /***************************** Prototypes ***************************/
112 /* The interrupt service routine */
113 static irqreturn_t a2232_vbl_inter(int irq, void *data, struct pt_regs *fp);
114 /* Initialize the port structures */
115 static void a2232_init_portstructs(void);
116 /* Initialize and register TTY drivers. */
117 /* returns 0 IFF successful */
118 static int a2232_init_drivers(void); 
119
120 /* BEGIN GENERIC_SERIAL PROTOTYPES */
121 static void a2232_disable_tx_interrupts(void *ptr);
122 static void a2232_enable_tx_interrupts(void *ptr);
123 static void a2232_disable_rx_interrupts(void *ptr);
124 static void a2232_enable_rx_interrupts(void *ptr);
125 static int  a2232_get_CD(void *ptr);
126 static void a2232_shutdown_port(void *ptr);
127 static int  a2232_set_real_termios(void *ptr);
128 static int  a2232_chars_in_buffer(void *ptr);
129 static void a2232_close(void *ptr);
130 static void a2232_hungup(void *ptr);
131 /* static void a2232_getserial (void *ptr, struct serial_struct *sp); */
132 /* END GENERIC_SERIAL PROTOTYPES */
133
134 /* Functions that the TTY driver struct expects */
135 static int  a2232_ioctl(struct tty_struct *tty, struct file *file,
136                                                                                 unsigned int cmd, unsigned long arg);
137 static void a2232_throttle(struct tty_struct *tty);
138 static void a2232_unthrottle(struct tty_struct *tty);
139 static int  a2232_open(struct tty_struct * tty, struct file * filp);
140 /************************* End of Prototypes ************************/
141
142 /***************************** Global variables *********************/
143 /*---------------------------------------------------------------------------
144  * Interface from generic_serial.c back here
145  *--------------------------------------------------------------------------*/
146 static struct real_driver a2232_real_driver = {
147         a2232_disable_tx_interrupts,
148         a2232_enable_tx_interrupts,
149         a2232_disable_rx_interrupts,
150         a2232_enable_rx_interrupts,
151         a2232_get_CD,
152         a2232_shutdown_port,
153         a2232_set_real_termios,
154         a2232_chars_in_buffer,
155         a2232_close,
156         a2232_hungup,
157         NULL    /* a2232_getserial */
158 };
159
160 static void *a2232_driver_ID = &a2232_driver_ID; // Some memory address WE own.
161
162 /* Ports structs */
163 static struct a2232_port a2232_ports[MAX_A2232_BOARDS*NUMLINES];
164
165 /* TTY driver structs */
166 static struct tty_driver *a2232_driver;
167
168 /* nr of cards completely (all ports) and correctly configured */
169 static int nr_a2232; 
170
171 /* zorro_dev structs for the A2232's */
172 static struct zorro_dev *zd_a2232[MAX_A2232_BOARDS]; 
173 /***************************** End of Global variables **************/
174
175 /* Helper functions */
176
177 static inline volatile struct a2232memory *a2232mem(unsigned int board)
178 {
179         return (volatile struct a2232memory *)ZTWO_VADDR(zd_a2232[board]->resource.start);
180 }
181
182 static inline volatile struct a2232status *a2232stat(unsigned int board,
183                                                      unsigned int portonboard)
184 {
185         volatile struct a2232memory *mem = a2232mem(board);
186         return &(mem->Status[portonboard]);
187 }
188
189 static inline void a2232_receive_char(struct a2232_port *port, int ch, int err)
190 {
191 /*      Mostly stolen from other drivers.
192         Maybe one could implement a more efficient version by not only
193         transferring one character at a time.
194 */
195         struct tty_struct *tty = port->gs.tty;
196
197         if (tty->flip.count >= TTY_FLIPBUF_SIZE)
198                 return;
199
200         tty->flip.count++;
201
202 #if 0
203         switch(err) {
204         case TTY_BREAK:
205                 break;
206         case TTY_PARITY:
207                 break;
208         case TTY_OVERRUN:
209                 break;
210         case TTY_FRAME:
211                 break;
212         }
213 #endif
214
215         *tty->flip.flag_buf_ptr++ = err;
216         *tty->flip.char_buf_ptr++ = ch;
217         tty_flip_buffer_push(tty);
218 }
219
220 /***************************** Functions ****************************/
221 /*** BEGIN OF REAL_DRIVER FUNCTIONS ***/
222
223 static void a2232_disable_tx_interrupts(void *ptr)
224 {
225         struct a2232_port *port;
226         volatile struct a2232status *stat;
227         unsigned long flags;
228   
229         port = ptr;
230         stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
231         stat->OutDisable = -1;
232
233         /* Does this here really have to be? */
234         local_irq_save(flags);
235         port->gs.flags &= ~GS_TX_INTEN;
236         local_irq_restore(flags);
237 }
238
239 static void a2232_enable_tx_interrupts(void *ptr)
240 {
241         struct a2232_port *port;
242         volatile struct a2232status *stat;
243         unsigned long flags;
244
245         port = ptr;
246         stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
247         stat->OutDisable = 0;
248
249         /* Does this here really have to be? */
250         local_irq_save(flags);
251         port->gs.flags |= GS_TX_INTEN;
252         local_irq_restore(flags);
253 }
254
255 static void a2232_disable_rx_interrupts(void *ptr)
256 {
257         struct a2232_port *port;
258         port = ptr;
259         port->disable_rx = -1;
260 }
261
262 static void a2232_enable_rx_interrupts(void *ptr)
263 {
264         struct a2232_port *port;
265         port = ptr;
266         port->disable_rx = 0;
267 }
268
269 static int  a2232_get_CD(void *ptr)
270 {
271         return ((struct a2232_port *) ptr)->cd_status;
272 }
273
274 static void a2232_shutdown_port(void *ptr)
275 {
276         struct a2232_port *port;
277         volatile struct a2232status *stat;
278         unsigned long flags;
279
280         port = ptr;
281         stat = a2232stat(port->which_a2232, port->which_port_on_a2232);
282
283         local_irq_save(flags);
284
285         port->gs.flags &= ~GS_ACTIVE;
286         
287         if (port->gs.tty && port->gs.tty->termios->c_cflag & HUPCL) {
288                 /* Set DTR and RTS to Low, flush output.
289                    The NetBSD driver "msc.c" does it this way. */
290                 stat->Command = (       (stat->Command & ~A2232CMD_CMask) | 
291                                         A2232CMD_Close );
292                 stat->OutFlush = -1;
293                 stat->Setup = -1;
294         }
295
296         local_irq_restore(flags);
297         
298         /* After analyzing control flow, I think a2232_shutdown_port
299                 is actually the last call from the system when at application
300                 level someone issues a "echo Hello >>/dev/ttyY0".
301                 Therefore I think the MOD_DEC_USE_COUNT should be here and
302                 not in "a2232_close()". See the comment in "sx.c", too.
303                 If you run into problems, compile this driver into the
304                 kernel instead of compiling it as a module. */
305 }
306
307 static int  a2232_set_real_termios(void *ptr)
308 {
309         unsigned int cflag, baud, chsize, stopb, parity, softflow;
310         int rate;
311         int a2232_param, a2232_cmd;
312         unsigned long flags;
313         unsigned int i;
314         struct a2232_port *port = ptr;
315         volatile struct a2232status *status;
316         volatile struct a2232memory *mem;
317
318         if (!port->gs.tty || !port->gs.tty->termios) return 0;
319
320         status = a2232stat(port->which_a2232, port->which_port_on_a2232);
321         mem = a2232mem(port->which_a2232);
322         
323         a2232_param = a2232_cmd = 0;
324
325         // get baud rate
326         baud = port->gs.baud;
327         if (baud == 0) {
328                 /* speed == 0 -> drop DTR, do nothing else */
329                 local_irq_save(flags);
330                 // Clear DTR (and RTS... mhhh).
331                 status->Command = (     (status->Command & ~A2232CMD_CMask) |
332                                         A2232CMD_Close );
333                 status->OutFlush = -1;
334                 status->Setup = -1;
335                 
336                 local_irq_restore(flags);
337                 return 0;
338         }
339         
340         rate = A2232_BAUD_TABLE_NOAVAIL;
341         for (i=0; i < A2232_BAUD_TABLE_NUM_RATES * 3; i += 3){
342                 if (a2232_baud_table[i] == baud){
343                         if (mem->Common.Crystal == A2232_TURBO) rate = a2232_baud_table[i+2];
344                         else                                    rate = a2232_baud_table[i+1];
345                 }
346         }
347         if (rate == A2232_BAUD_TABLE_NOAVAIL){
348                 printk("a2232: Board %d Port %d unsupported baud rate: %d baud. Using another.\n",port->which_a2232,port->which_port_on_a2232,baud);
349                 // This is useful for both (turbo or normal) Crystal versions.
350                 rate = A2232PARAM_B9600;
351         }
352         a2232_param |= rate;
353
354         cflag  = port->gs.tty->termios->c_cflag;
355
356         // get character size
357         chsize = cflag & CSIZE;
358         switch (chsize){
359                 case CS8:       a2232_param |= A2232PARAM_8Bit; break;
360                 case CS7:       a2232_param |= A2232PARAM_7Bit; break;
361                 case CS6:       a2232_param |= A2232PARAM_6Bit; break;
362                 case CS5:       a2232_param |= A2232PARAM_5Bit; break;
363                 default:        printk("a2232: Board %d Port %d unsupported character size: %d. Using 8 data bits.\n",
364                                         port->which_a2232,port->which_port_on_a2232,chsize);
365                                 a2232_param |= A2232PARAM_8Bit; break;
366         }
367
368         // get number of stop bits
369         stopb  = cflag & CSTOPB;
370         if (stopb){ // two stop bits instead of one
371                 printk("a2232: Board %d Port %d 2 stop bits unsupported. Using 1 stop bit.\n",
372                         port->which_a2232,port->which_port_on_a2232);
373         }
374
375         // Warn if RTS/CTS not wanted
376         if (!(cflag & CRTSCTS)){
377 #ifndef A2232_SUPPRESS_RTSCTS_WARNING
378                 printk("a2232: Board %d Port %d cannot switch off firmware-implemented RTS/CTS hardware flow control.\n",
379                         port->which_a2232,port->which_port_on_a2232);
380 #endif
381         }
382
383         /*      I think this is correct.
384                 However, IXOFF means _input_ flow control and I wonder
385                 if one should care about IXON _output_ flow control,
386                 too. If this makes problems, one should turn the A2232
387                 firmware XON/XOFF "SoftFlow" flow control off and use
388                 the conventional way of inserting START/STOP characters
389                 by hand in throttle()/unthrottle().
390         */
391         softflow = !!( port->gs.tty->termios->c_iflag & IXOFF );
392
393         // get Parity (Enabled/Disabled? If Enabled, Odd or Even?)
394         parity = cflag & (PARENB | PARODD);
395         if (parity & PARENB){
396                 if (parity & PARODD){
397                         a2232_cmd |= A2232CMD_OddParity;
398                 }
399                 else{
400                         a2232_cmd |= A2232CMD_EvenParity;
401                 }
402         }
403         else a2232_cmd |= A2232CMD_NoParity;
404
405
406         /*      Hmm. Maybe an own a2232_port structure
407                 member would be cleaner?        */
408         if (cflag & CLOCAL)
409                 port->gs.flags &= ~ASYNC_CHECK_CD;
410         else
411                 port->gs.flags |= ASYNC_CHECK_CD;
412
413
414         /* Now we have all parameters and can go to set them: */
415         local_irq_save(flags);
416
417         status->Param = a2232_param | A2232PARAM_RcvBaud;
418         status->Command = a2232_cmd | A2232CMD_Open |  A2232CMD_Enable;
419         status->SoftFlow = softflow;
420         status->OutDisable = 0;
421         status->Setup = -1;
422
423         local_irq_restore(flags);
424         return 0;
425 }
426
427 static int  a2232_chars_in_buffer(void *ptr)
428 {
429         struct a2232_port *port;
430         volatile struct a2232status *status; 
431         unsigned char ret; /* we need modulo-256 arithmetics */
432         port = ptr;
433         status = a2232stat(port->which_a2232, port->which_port_on_a2232);
434 #if A2232_IOBUFLEN != 256
435 #error "Re-Implement a2232_chars_in_buffer()!"
436 #endif
437         ret = (status->OutHead - status->OutTail);
438         return ret;
439 }
440
441 static void a2232_close(void *ptr)
442 {
443         a2232_disable_tx_interrupts(ptr);
444         a2232_disable_rx_interrupts(ptr);
445         /* see the comment in a2232_shutdown_port above. */
446 }
447
448 static void a2232_hungup(void *ptr)
449 {
450         a2232_close(ptr);
451 }
452 /*** END   OF REAL_DRIVER FUNCTIONS ***/
453
454 /*** BEGIN  FUNCTIONS EXPECTED BY TTY DRIVER STRUCTS ***/
455 static int a2232_ioctl( struct tty_struct *tty, struct file *file,
456                         unsigned int cmd, unsigned long arg)
457 {
458         return -ENOIOCTLCMD;
459 }
460
461 static void a2232_throttle(struct tty_struct *tty)
462 {
463 /* Throttle: System cannot take another chars: Drop RTS or
464              send the STOP char or whatever.
465    The A2232 firmware does RTS/CTS anyway, and XON/XOFF
466    if switched on. So the only thing we can do at this
467    layer here is not taking any characters out of the
468    A2232 buffer any more. */
469         struct a2232_port *port = (struct a2232_port *) tty->driver_data;
470         port->throttle_input = -1;
471 }
472
473 static void a2232_unthrottle(struct tty_struct *tty)
474 {
475 /* Unthrottle: dual to "throttle()" above. */
476         struct a2232_port *port = (struct a2232_port *) tty->driver_data;
477         port->throttle_input = 0;
478 }
479
480 static int  a2232_open(struct tty_struct * tty, struct file * filp)
481 {
482 /* More or less stolen from other drivers. */
483         int line;
484         int retval;
485         struct a2232_port *port;
486
487         line = tty->index;
488         port = &a2232_ports[line];
489         
490         tty->driver_data = port;
491         port->gs.tty = tty;
492         port->gs.count++;
493         retval = gs_init_port(&port->gs);
494         if (retval) {
495                 port->gs.count--;
496                 return retval;
497         }
498         port->gs.flags |= GS_ACTIVE;
499         retval = gs_block_til_ready(port, filp);
500
501         if (retval) {
502                 port->gs.count--;
503                 return retval;
504         }
505
506         a2232_enable_rx_interrupts(port);
507         
508         return 0;
509 }
510 /*** END OF FUNCTIONS EXPECTED BY TTY DRIVER STRUCTS ***/
511
512 static irqreturn_t a2232_vbl_inter(int irq, void *data, struct pt_regs *fp)
513 {
514 #if A2232_IOBUFLEN != 256
515 #error "Re-Implement a2232_vbl_inter()!"
516 #endif
517
518 struct a2232_port *port;
519 volatile struct a2232memory *mem;
520 volatile struct a2232status *status;
521 unsigned char newhead;
522 unsigned char bufpos; /* Must be unsigned char. We need the modulo-256 arithmetics */
523 unsigned char ncd, ocd, ccd; /* names consistent with the NetBSD driver */
524 volatile u_char *ibuf, *cbuf, *obuf;
525 int ch, err, n, p;
526         for (n = 0; n < nr_a2232; n++){         /* for every completely initialized A2232 board */
527                 mem = a2232mem(n);
528                 for (p = 0; p < NUMLINES; p++){ /* for every port on this board */
529                         err = 0;
530                         port = &a2232_ports[n*NUMLINES+p];
531                         if ( port->gs.flags & GS_ACTIVE ){ /* if the port is used */
532
533                                 status = a2232stat(n,p);
534
535                                 if (!port->disable_rx && !port->throttle_input){ /* If input is not disabled */
536                                         newhead = status->InHead;               /* 65EC02 write pointer */
537                                         bufpos = status->InTail;
538
539                                         /* check for input for this port */
540                                         if (newhead != bufpos) {
541                                                 /* buffer for input chars/events */
542                                                 ibuf = mem->InBuf[p];
543  
544                                                 /* data types of bytes in ibuf */
545                                                 cbuf = mem->InCtl[p];
546  
547                                                 /* do for all chars */
548                                                 while (bufpos != newhead) {
549                                                         /* which type of input data? */
550                                                         switch (cbuf[bufpos]) {
551                                                                 /* switch on input event (CD, BREAK, etc.) */
552                                                         case A2232INCTL_EVENT:
553                                                                 switch (ibuf[bufpos++]) {
554                                                                 case A2232EVENT_Break:
555                                                                         /* TODO: Handle BREAK signal */
556                                                                         break;
557                                                                         /*      A2232EVENT_CarrierOn and A2232EVENT_CarrierOff are
558                                                                                 handled in a separate queue and should not occur here. */
559                                                                 case A2232EVENT_Sync:
560                                                                         printk("A2232: 65EC02 software sent SYNC event, don't know what to do. Ignoring.");
561                                                                         break;
562                                                                 default:
563                                                                         printk("A2232: 65EC02 software broken, unknown event type %d occurred.\n",ibuf[bufpos-1]);
564                                                                 } /* event type switch */
565                                                                 break;
566                                                         case A2232INCTL_CHAR:
567                                                                 /* Receive incoming char */
568                                                                 a2232_receive_char(port, ibuf[bufpos], err);
569                                                                 bufpos++;
570                                                                 break;
571                                                         default:
572                                                                 printk("A2232: 65EC02 software broken, unknown data type %d occurred.\n",cbuf[bufpos]);
573                                                                 bufpos++;
574                                                         } /* switch on input data type */
575                                                 } /* while there's something in the buffer */
576
577                                                 status->InTail = bufpos;            /* tell 65EC02 what we've read */
578                                                 
579                                         } /* if there was something in the buffer */                          
580                                 } /* If input is not disabled */
581
582                                 /* Now check if there's something to output */
583                                 obuf = mem->OutBuf[p];
584                                 bufpos = status->OutHead;
585                                 while ( (port->gs.xmit_cnt > 0)         &&
586                                         (!port->gs.tty->stopped)        &&
587                                         (!port->gs.tty->hw_stopped) ){  /* While there are chars to transmit */
588                                         if (((bufpos+1) & A2232_IOBUFLENMASK) != status->OutTail) { /* If the A2232 buffer is not full */
589                                                 ch = port->gs.xmit_buf[port->gs.xmit_tail];                                     /* get the next char to transmit */
590                                                 port->gs.xmit_tail = (port->gs.xmit_tail+1) & (SERIAL_XMIT_SIZE-1); /* modulo-addition for the gs.xmit_buf ring-buffer */
591                                                 obuf[bufpos++] = ch;                                                                                                                            /* put it into the A2232 buffer */
592                                                 port->gs.xmit_cnt--;
593                                         }
594                                         else{                                                                                                                                                                                                   /* If A2232 the buffer is full */
595                                                 break;                                                                                                                                                                                  /* simply stop filling it. */
596                                         }                                                                                                       
597                                 }                                       
598                                 status->OutHead = bufpos;
599                                         
600                                 /* WakeUp if output buffer runs low */
601                                 if ((port->gs.xmit_cnt <= port->gs.wakeup_chars) && port->gs.tty) {
602                                         tty_wakeup(port->gs.tty);
603                                 }
604                         } // if the port is used
605                 } // for every port on the board
606                         
607                 /* Now check the CD message queue */
608                 newhead = mem->Common.CDHead;
609                 bufpos = mem->Common.CDTail;
610                 if (newhead != bufpos){                         /* There are CD events in queue */
611                         ocd = mem->Common.CDStatus;             /* get old status bits */
612                         while (newhead != bufpos){              /* read all events */
613                                 ncd = mem->CDBuf[bufpos++];     /* get one event */
614                                 ccd = ncd ^ ocd;                /* mask of changed lines */
615                                 ocd = ncd;                      /* save new status bits */
616                                 for(p=0; p < NUMLINES; p++){    /* for all ports */
617                                         if (ccd & 1){           /* this one changed */
618
619                                                 struct a2232_port *port = &a2232_ports[n*7+p];
620                                                 port->cd_status = !(ncd & 1); /* ncd&1 <=> CD is now off */
621
622                                                 if (!(port->gs.flags & ASYNC_CHECK_CD))
623                                                         ;       /* Don't report DCD changes */
624                                                 else if (port->cd_status) { // if DCD on: DCD went UP!
625                                                         
626                                                         /* Are we blocking in open?*/
627                                                         wake_up_interruptible(&port->gs.open_wait);
628                                                 }
629                                                 else { // if DCD off: DCD went DOWN!
630                                                         if (port->gs.tty)
631                                                                 tty_hangup (port->gs.tty);
632                                                 }
633                                                 
634                                         } // if CD changed for this port
635                                         ccd >>= 1;
636                                         ncd >>= 1;                                                                      /* Shift bits for next line */
637                                 } // for every port
638                         } // while CD events in queue
639                         mem->Common.CDStatus = ocd; /* save new status */
640                         mem->Common.CDTail = bufpos; /* remove events */
641                 } // if events in CD queue
642                 
643         } // for every completely initialized A2232 board
644         return IRQ_HANDLED;
645 }
646
647 static void a2232_init_portstructs(void)
648 {
649         struct a2232_port *port;
650         int i;
651
652         for (i = 0; i < MAX_A2232_BOARDS*NUMLINES; i++) {
653                 port = a2232_ports + i;
654                 port->which_a2232 = i/NUMLINES;
655                 port->which_port_on_a2232 = i%NUMLINES;
656                 port->disable_rx = port->throttle_input = port->cd_status = 0;
657                 port->gs.magic = A2232_MAGIC;
658                 port->gs.close_delay = HZ/2;
659                 port->gs.closing_wait = 30 * HZ;
660                 port->gs.rd = &a2232_real_driver;
661 #ifdef NEW_WRITE_LOCKING
662                 init_MUTEX(&(port->gs.port_write_sem));
663 #endif
664                 init_waitqueue_head(&port->gs.open_wait);
665                 init_waitqueue_head(&port->gs.close_wait);
666         }
667 }
668
669 static struct tty_operations a2232_ops = {
670         .open = a2232_open,
671         .close = gs_close,
672         .write = gs_write,
673         .put_char = gs_put_char,
674         .flush_chars = gs_flush_chars,
675         .write_room = gs_write_room,
676         .chars_in_buffer = gs_chars_in_buffer,
677         .flush_buffer = gs_flush_buffer,
678         .ioctl = a2232_ioctl,
679         .throttle = a2232_throttle,
680         .unthrottle = a2232_unthrottle,
681         .set_termios = gs_set_termios,
682         .stop = gs_stop,
683         .start = gs_start,
684         .hangup = gs_hangup,
685 };
686
687 static int a2232_init_drivers(void)
688 {
689         int error;
690
691         a2232_driver = alloc_tty_driver(NUMLINES * nr_a2232);
692         if (!a2232_driver)
693                 return -ENOMEM;
694         a2232_driver->owner = THIS_MODULE;
695         a2232_driver->driver_name = "commodore_a2232";
696         a2232_driver->name = "ttyY";
697         a2232_driver->major = A2232_NORMAL_MAJOR;
698         a2232_driver->type = TTY_DRIVER_TYPE_SERIAL;
699         a2232_driver->subtype = SERIAL_TYPE_NORMAL;
700         a2232_driver->init_termios = tty_std_termios;
701         a2232_driver->init_termios.c_cflag =
702                 B9600 | CS8 | CREAD | HUPCL | CLOCAL;
703         a2232_driver->flags = TTY_DRIVER_REAL_RAW;
704         tty_set_operations(a2232_driver, &a2232_ops);
705         if ((error = tty_register_driver(a2232_driver))) {
706                 printk(KERN_ERR "A2232: Couldn't register A2232 driver, error = %d\n",
707                        error);
708                 put_tty_driver(a2232_driver);
709                 return 1;
710         }
711         return 0;
712 }
713
714 static int __init a2232board_init(void)
715 {
716         struct zorro_dev *z;
717
718         unsigned int boardaddr;
719         int bcount;
720         short start;
721         u_char *from;
722         volatile u_char *to;
723         volatile struct a2232memory *mem;
724
725 #ifdef CONFIG_SMP
726         return -ENODEV; /* This driver is not SMP aware. Is there an SMP ZorroII-bus-machine? */
727 #endif
728
729         if (!MACH_IS_AMIGA){
730                 return -ENODEV;
731         }
732
733         printk("Commodore A2232 driver initializing.\n"); /* Say that we're alive. */
734
735         z = NULL;
736         nr_a2232 = 0;
737         while ( (z = zorro_find_device(ZORRO_WILDCARD, z)) ){
738                 if (    (z->id != ZORRO_PROD_CBM_A2232_PROTOTYPE) && 
739                         (z->id != ZORRO_PROD_CBM_A2232) ){
740                         continue;       // The board found was no A2232
741                 }
742                 if (!zorro_request_device(z,"A2232 driver"))
743                         continue;
744
745                 printk("Commodore A2232 found (#%d).\n",nr_a2232);
746
747                 zd_a2232[nr_a2232] = z;
748
749                 boardaddr = ZTWO_VADDR( z->resource.start );
750                 printk("Board is located at address 0x%x, size is 0x%x.\n", boardaddr, (unsigned int) ((z->resource.end+1) - (z->resource.start)));
751
752                 mem = (volatile struct a2232memory *) boardaddr;
753
754                 (void) mem->Enable6502Reset;   /* copy the code across to the board */
755                 to = (u_char *)mem;  from = a2232_65EC02code; bcount = sizeof(a2232_65EC02code) - 2;
756                 start = *(short *)from;
757                 from += sizeof(start);
758                 to += start;
759                 while(bcount--) *to++ = *from++;
760                 printk("65EC02 software uploaded to the A2232 memory.\n");
761   
762                 mem->Common.Crystal = A2232_UNKNOWN;  /* use automatic speed check */
763   
764                 /* start 6502 running */
765                 (void) mem->ResetBoard;
766                 printk("A2232's 65EC02 CPU up and running.\n");
767   
768                 /* wait until speed detector has finished */
769                 for (bcount = 0; bcount < 2000; bcount++) {
770                         udelay(1000);
771                         if (mem->Common.Crystal)
772                                 break;
773                 }
774                 printk((mem->Common.Crystal?"A2232 oscillator crystal detected by 65EC02 software: ":"65EC02 software could not determine A2232 oscillator crystal: "));
775                 switch (mem->Common.Crystal){
776                 case A2232_UNKNOWN:
777                         printk("Unknown crystal.\n");
778                         break;
779                 case A2232_NORMAL:
780                         printk ("Normal crystal.\n");
781                         break;
782                 case A2232_TURBO:
783                         printk ("Turbo crystal.\n");
784                         break;
785                 default:
786                         printk ("0x%x. Huh?\n",mem->Common.Crystal);
787                 }
788
789                 nr_a2232++;
790
791         }       
792
793         printk("Total: %d A2232 boards initialized.\n", nr_a2232); /* Some status report if no card was found */
794
795         a2232_init_portstructs();
796
797         /*
798                 a2232_init_drivers also registers the drivers. Must be here because all boards
799                 have to be detected first.
800         */
801         if (a2232_init_drivers()) return -ENODEV; // maybe we should use a different -Exxx?
802
803         request_irq(IRQ_AMIGA_VERTB, a2232_vbl_inter, 0, "A2232 serial VBL", a2232_driver_ID);
804         return 0;
805 }
806
807 static void __exit a2232board_exit(void)
808 {
809         int i;
810
811         for (i = 0; i < nr_a2232; i++) {
812                 zorro_release_device(zd_a2232[i]);
813         }
814
815         tty_unregister_driver(a2232_driver);
816         put_tty_driver(a2232_driver);
817         free_irq(IRQ_AMIGA_VERTB, a2232_driver_ID);
818 }
819
820 module_init(a2232board_init);
821 module_exit(a2232board_exit);
822
823 MODULE_AUTHOR("Enver Haase");
824 MODULE_DESCRIPTION("Amiga A2232 multi-serial board driver");
825 MODULE_LICENSE("GPL");