ia64/linux-2.6.18-xen.hg

view drivers/char/dtlk.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
1 /* -*- linux-c -*-
2 * dtlk.c - DoubleTalk PC driver for Linux
3 *
4 * Original author: Chris Pallotta <chris@allmedia.com>
5 * Current maintainer: Jim Van Zandt <jrv@vanzandt.mv.com>
6 *
7 * 2000-03-18 Jim Van Zandt: Fix polling.
8 * Eliminate dtlk_timer_active flag and separate dtlk_stop_timer
9 * function. Don't restart timer in dtlk_timer_tick. Restart timer
10 * in dtlk_poll after every poll. dtlk_poll returns mask (duh).
11 * Eliminate unused function dtlk_write_byte. Misc. code cleanups.
12 */
14 /* This driver is for the DoubleTalk PC, a speech synthesizer
15 manufactured by RC Systems (http://www.rcsys.com/). It was written
16 based on documentation in their User's Manual file and Developer's
17 Tools disk.
19 The DoubleTalk PC contains four voice synthesizers: text-to-speech
20 (TTS), linear predictive coding (LPC), PCM/ADPCM, and CVSD. It
21 also has a tone generator. Output data for LPC are written to the
22 LPC port, and output data for the other modes are written to the
23 TTS port.
25 Two kinds of data can be read from the DoubleTalk: status
26 information (in response to the "\001?" interrogation command) is
27 read from the TTS port, and index markers (which mark the progress
28 of the speech) are read from the LPC port. Not all models of the
29 DoubleTalk PC implement index markers. Both the TTS and LPC ports
30 can also display status flags.
32 The DoubleTalk PC generates no interrupts.
34 These characteristics are mapped into the Unix stream I/O model as
35 follows:
37 "write" sends bytes to the TTS port. It is the responsibility of
38 the user program to switch modes among TTS, PCM/ADPCM, and CVSD.
39 This driver was written for use with the text-to-speech
40 synthesizer. If LPC output is needed some day, other minor device
41 numbers can be used to select among output modes.
43 "read" gets index markers from the LPC port. If the device does
44 not implement index markers, the read will fail with error EINVAL.
46 Status information is available using the DTLK_INTERROGATE ioctl.
48 */
50 #include <linux/module.h>
52 #define KERNEL
53 #include <linux/types.h>
54 #include <linux/fs.h>
55 #include <linux/mm.h>
56 #include <linux/errno.h> /* for -EBUSY */
57 #include <linux/ioport.h> /* for request_region */
58 #include <linux/delay.h> /* for loops_per_jiffy */
59 #include <asm/io.h> /* for inb_p, outb_p, inb, outb, etc. */
60 #include <asm/uaccess.h> /* for get_user, etc. */
61 #include <linux/wait.h> /* for wait_queue */
62 #include <linux/init.h> /* for __init, module_{init,exit} */
63 #include <linux/poll.h> /* for POLLIN, etc. */
64 #include <linux/dtlk.h> /* local header file for DoubleTalk values */
65 #include <linux/smp_lock.h>
67 #ifdef TRACING
68 #define TRACE_TEXT(str) printk(str);
69 #define TRACE_RET printk(")")
70 #else /* !TRACING */
71 #define TRACE_TEXT(str) ((void) 0)
72 #define TRACE_RET ((void) 0)
73 #endif /* TRACING */
76 static int dtlk_major;
77 static int dtlk_port_lpc;
78 static int dtlk_port_tts;
79 static int dtlk_busy;
80 static int dtlk_has_indexing;
81 static unsigned int dtlk_portlist[] =
82 {0x25e, 0x29e, 0x2de, 0x31e, 0x35e, 0x39e, 0};
83 static wait_queue_head_t dtlk_process_list;
84 static struct timer_list dtlk_timer;
86 /* prototypes for file_operations struct */
87 static ssize_t dtlk_read(struct file *, char __user *,
88 size_t nbytes, loff_t * ppos);
89 static ssize_t dtlk_write(struct file *, const char __user *,
90 size_t nbytes, loff_t * ppos);
91 static unsigned int dtlk_poll(struct file *, poll_table *);
92 static int dtlk_open(struct inode *, struct file *);
93 static int dtlk_release(struct inode *, struct file *);
94 static int dtlk_ioctl(struct inode *inode, struct file *file,
95 unsigned int cmd, unsigned long arg);
97 static const struct file_operations dtlk_fops =
98 {
99 .owner = THIS_MODULE,
100 .read = dtlk_read,
101 .write = dtlk_write,
102 .poll = dtlk_poll,
103 .ioctl = dtlk_ioctl,
104 .open = dtlk_open,
105 .release = dtlk_release,
106 };
108 /* local prototypes */
109 static int dtlk_dev_probe(void);
110 static struct dtlk_settings *dtlk_interrogate(void);
111 static int dtlk_readable(void);
112 static char dtlk_read_lpc(void);
113 static char dtlk_read_tts(void);
114 static int dtlk_writeable(void);
115 static char dtlk_write_bytes(const char *buf, int n);
116 static char dtlk_write_tts(char);
117 /*
118 static void dtlk_handle_error(char, char, unsigned int);
119 */
120 static void dtlk_timer_tick(unsigned long data);
122 static ssize_t dtlk_read(struct file *file, char __user *buf,
123 size_t count, loff_t * ppos)
124 {
125 unsigned int minor = iminor(file->f_dentry->d_inode);
126 char ch;
127 int i = 0, retries;
129 TRACE_TEXT("(dtlk_read");
130 /* printk("DoubleTalk PC - dtlk_read()\n"); */
132 if (minor != DTLK_MINOR || !dtlk_has_indexing)
133 return -EINVAL;
135 for (retries = 0; retries < loops_per_jiffy; retries++) {
136 while (i < count && dtlk_readable()) {
137 ch = dtlk_read_lpc();
138 /* printk("dtlk_read() reads 0x%02x\n", ch); */
139 if (put_user(ch, buf++))
140 return -EFAULT;
141 i++;
142 }
143 if (i)
144 return i;
145 if (file->f_flags & O_NONBLOCK)
146 break;
147 msleep_interruptible(100);
148 }
149 if (retries == loops_per_jiffy)
150 printk(KERN_ERR "dtlk_read times out\n");
151 TRACE_RET;
152 return -EAGAIN;
153 }
155 static ssize_t dtlk_write(struct file *file, const char __user *buf,
156 size_t count, loff_t * ppos)
157 {
158 int i = 0, retries = 0, ch;
160 TRACE_TEXT("(dtlk_write");
161 #ifdef TRACING
162 printk(" \"");
163 {
164 int i, ch;
165 for (i = 0; i < count; i++) {
166 if (get_user(ch, buf + i))
167 return -EFAULT;
168 if (' ' <= ch && ch <= '~')
169 printk("%c", ch);
170 else
171 printk("\\%03o", ch);
172 }
173 printk("\"");
174 }
175 #endif
177 if (iminor(file->f_dentry->d_inode) != DTLK_MINOR)
178 return -EINVAL;
180 while (1) {
181 while (i < count && !get_user(ch, buf) &&
182 (ch == DTLK_CLEAR || dtlk_writeable())) {
183 dtlk_write_tts(ch);
184 buf++;
185 i++;
186 if (i % 5 == 0)
187 /* We yield our time until scheduled
188 again. This reduces the transfer
189 rate to 500 bytes/sec, but that's
190 still enough to keep up with the
191 speech synthesizer. */
192 msleep_interruptible(1);
193 else {
194 /* the RDY bit goes zero 2-3 usec
195 after writing, and goes 1 again
196 180-190 usec later. Here, we wait
197 up to 250 usec for the RDY bit to
198 go nonzero. */
199 for (retries = 0;
200 retries < loops_per_jiffy / (4000/HZ);
201 retries++)
202 if (inb_p(dtlk_port_tts) &
203 TTS_WRITABLE)
204 break;
205 }
206 retries = 0;
207 }
208 if (i == count)
209 return i;
210 if (file->f_flags & O_NONBLOCK)
211 break;
213 msleep_interruptible(1);
215 if (++retries > 10 * HZ) { /* wait no more than 10 sec
216 from last write */
217 printk("dtlk: write timeout. "
218 "inb_p(dtlk_port_tts) = 0x%02x\n",
219 inb_p(dtlk_port_tts));
220 TRACE_RET;
221 return -EBUSY;
222 }
223 }
224 TRACE_RET;
225 return -EAGAIN;
226 }
228 static unsigned int dtlk_poll(struct file *file, poll_table * wait)
229 {
230 int mask = 0;
231 unsigned long expires;
233 TRACE_TEXT(" dtlk_poll");
234 /*
235 static long int j;
236 printk(".");
237 printk("<%ld>", jiffies-j);
238 j=jiffies;
239 */
240 poll_wait(file, &dtlk_process_list, wait);
242 if (dtlk_has_indexing && dtlk_readable()) {
243 del_timer(&dtlk_timer);
244 mask = POLLIN | POLLRDNORM;
245 }
246 if (dtlk_writeable()) {
247 del_timer(&dtlk_timer);
248 mask |= POLLOUT | POLLWRNORM;
249 }
250 /* there are no exception conditions */
252 /* There won't be any interrupts, so we set a timer instead. */
253 expires = jiffies + 3*HZ / 100;
254 mod_timer(&dtlk_timer, expires);
256 return mask;
257 }
259 static void dtlk_timer_tick(unsigned long data)
260 {
261 TRACE_TEXT(" dtlk_timer_tick");
262 wake_up_interruptible(&dtlk_process_list);
263 }
265 static int dtlk_ioctl(struct inode *inode,
266 struct file *file,
267 unsigned int cmd,
268 unsigned long arg)
269 {
270 char __user *argp = (char __user *)arg;
271 struct dtlk_settings *sp;
272 char portval;
273 TRACE_TEXT(" dtlk_ioctl");
275 switch (cmd) {
277 case DTLK_INTERROGATE:
278 sp = dtlk_interrogate();
279 if (copy_to_user(argp, sp, sizeof(struct dtlk_settings)))
280 return -EINVAL;
281 return 0;
283 case DTLK_STATUS:
284 portval = inb_p(dtlk_port_tts);
285 return put_user(portval, argp);
287 default:
288 return -EINVAL;
289 }
290 }
292 static int dtlk_open(struct inode *inode, struct file *file)
293 {
294 TRACE_TEXT("(dtlk_open");
296 nonseekable_open(inode, file);
297 switch (iminor(inode)) {
298 case DTLK_MINOR:
299 if (dtlk_busy)
300 return -EBUSY;
301 return nonseekable_open(inode, file);
303 default:
304 return -ENXIO;
305 }
306 }
308 static int dtlk_release(struct inode *inode, struct file *file)
309 {
310 TRACE_TEXT("(dtlk_release");
312 switch (iminor(inode)) {
313 case DTLK_MINOR:
314 break;
316 default:
317 break;
318 }
319 TRACE_RET;
321 del_timer(&dtlk_timer);
323 return 0;
324 }
326 static int __init dtlk_init(void)
327 {
328 dtlk_port_lpc = 0;
329 dtlk_port_tts = 0;
330 dtlk_busy = 0;
331 dtlk_major = register_chrdev(0, "dtlk", &dtlk_fops);
332 if (dtlk_major == 0) {
333 printk(KERN_ERR "DoubleTalk PC - cannot register device\n");
334 return 0;
335 }
336 if (dtlk_dev_probe() == 0)
337 printk(", MAJOR %d\n", dtlk_major);
339 init_timer(&dtlk_timer);
340 dtlk_timer.function = dtlk_timer_tick;
341 init_waitqueue_head(&dtlk_process_list);
343 return 0;
344 }
346 static void __exit dtlk_cleanup (void)
347 {
348 dtlk_write_bytes("goodbye", 8);
349 msleep_interruptible(500); /* nap 0.50 sec but
350 could be awakened
351 earlier by
352 signals... */
354 dtlk_write_tts(DTLK_CLEAR);
355 unregister_chrdev(dtlk_major, "dtlk");
356 release_region(dtlk_port_lpc, DTLK_IO_EXTENT);
357 }
359 module_init(dtlk_init);
360 module_exit(dtlk_cleanup);
362 /* ------------------------------------------------------------------------ */
364 static int dtlk_readable(void)
365 {
366 #ifdef TRACING
367 printk(" dtlk_readable=%u@%u", inb_p(dtlk_port_lpc) != 0x7f, jiffies);
368 #endif
369 return inb_p(dtlk_port_lpc) != 0x7f;
370 }
372 static int dtlk_writeable(void)
373 {
374 /* TRACE_TEXT(" dtlk_writeable"); */
375 #ifdef TRACINGMORE
376 printk(" dtlk_writeable=%u", (inb_p(dtlk_port_tts) & TTS_WRITABLE)!=0);
377 #endif
378 return inb_p(dtlk_port_tts) & TTS_WRITABLE;
379 }
381 static int __init dtlk_dev_probe(void)
382 {
383 unsigned int testval = 0;
384 int i = 0;
385 struct dtlk_settings *sp;
387 if (dtlk_port_lpc | dtlk_port_tts)
388 return -EBUSY;
390 for (i = 0; dtlk_portlist[i]; i++) {
391 #if 0
392 printk("DoubleTalk PC - Port %03x = %04x\n",
393 dtlk_portlist[i], (testval = inw_p(dtlk_portlist[i])));
394 #endif
396 if (!request_region(dtlk_portlist[i], DTLK_IO_EXTENT,
397 "dtlk"))
398 continue;
399 testval = inw_p(dtlk_portlist[i]);
400 if ((testval &= 0xfbff) == 0x107f) {
401 dtlk_port_lpc = dtlk_portlist[i];
402 dtlk_port_tts = dtlk_port_lpc + 1;
404 sp = dtlk_interrogate();
405 printk("DoubleTalk PC at %03x-%03x, "
406 "ROM version %s, serial number %u",
407 dtlk_portlist[i], dtlk_portlist[i] +
408 DTLK_IO_EXTENT - 1,
409 sp->rom_version, sp->serial_number);
411 /* put LPC port into known state, so
412 dtlk_readable() gives valid result */
413 outb_p(0xff, dtlk_port_lpc);
415 /* INIT string and index marker */
416 dtlk_write_bytes("\036\1@\0\0012I\r", 8);
417 /* posting an index takes 18 msec. Here, we
418 wait up to 100 msec to see whether it
419 appears. */
420 msleep_interruptible(100);
421 dtlk_has_indexing = dtlk_readable();
422 #ifdef TRACING
423 printk(", indexing %d\n", dtlk_has_indexing);
424 #endif
425 #ifdef INSCOPE
426 {
427 /* This macro records ten samples read from the LPC port, for later display */
428 #define LOOK \
429 for (i = 0; i < 10; i++) \
430 { \
431 buffer[b++] = inb_p(dtlk_port_lpc); \
432 __delay(loops_per_jiffy/(1000000/HZ)); \
433 }
434 char buffer[1000];
435 int b = 0, i, j;
437 LOOK
438 outb_p(0xff, dtlk_port_lpc);
439 buffer[b++] = 0;
440 LOOK
441 dtlk_write_bytes("\0012I\r", 4);
442 buffer[b++] = 0;
443 __delay(50 * loops_per_jiffy / (1000/HZ));
444 outb_p(0xff, dtlk_port_lpc);
445 buffer[b++] = 0;
446 LOOK
448 printk("\n");
449 for (j = 0; j < b; j++)
450 printk(" %02x", buffer[j]);
451 printk("\n");
452 }
453 #endif /* INSCOPE */
455 #ifdef OUTSCOPE
456 {
457 /* This macro records ten samples read from the TTS port, for later display */
458 #define LOOK \
459 for (i = 0; i < 10; i++) \
460 { \
461 buffer[b++] = inb_p(dtlk_port_tts); \
462 __delay(loops_per_jiffy/(1000000/HZ)); /* 1 us */ \
463 }
464 char buffer[1000];
465 int b = 0, i, j;
467 mdelay(10); /* 10 ms */
468 LOOK
469 outb_p(0x03, dtlk_port_tts);
470 buffer[b++] = 0;
471 LOOK
472 LOOK
474 printk("\n");
475 for (j = 0; j < b; j++)
476 printk(" %02x", buffer[j]);
477 printk("\n");
478 }
479 #endif /* OUTSCOPE */
481 dtlk_write_bytes("Double Talk found", 18);
483 return 0;
484 }
485 release_region(dtlk_portlist[i], DTLK_IO_EXTENT);
486 }
488 printk(KERN_INFO "DoubleTalk PC - not found\n");
489 return -ENODEV;
490 }
492 /*
493 static void dtlk_handle_error(char op, char rc, unsigned int minor)
494 {
495 printk(KERN_INFO"\nDoubleTalk PC - MINOR: %d, OPCODE: %d, ERROR: %d\n",
496 minor, op, rc);
497 return;
498 }
499 */
501 /* interrogate the DoubleTalk PC and return its settings */
502 static struct dtlk_settings *dtlk_interrogate(void)
503 {
504 unsigned char *t;
505 static char buf[sizeof(struct dtlk_settings) + 1];
506 int total, i;
507 static struct dtlk_settings status;
508 TRACE_TEXT("(dtlk_interrogate");
509 dtlk_write_bytes("\030\001?", 3);
510 for (total = 0, i = 0; i < 50; i++) {
511 buf[total] = dtlk_read_tts();
512 if (total > 2 && buf[total] == 0x7f)
513 break;
514 if (total < sizeof(struct dtlk_settings))
515 total++;
516 }
517 /*
518 if (i==50) printk("interrogate() read overrun\n");
519 for (i=0; i<sizeof(buf); i++)
520 printk(" %02x", buf[i]);
521 printk("\n");
522 */
523 t = buf;
524 status.serial_number = t[0] + t[1] * 256; /* serial number is
525 little endian */
526 t += 2;
528 i = 0;
529 while (*t != '\r') {
530 status.rom_version[i] = *t;
531 if (i < sizeof(status.rom_version) - 1)
532 i++;
533 t++;
534 }
535 status.rom_version[i] = 0;
536 t++;
538 status.mode = *t++;
539 status.punc_level = *t++;
540 status.formant_freq = *t++;
541 status.pitch = *t++;
542 status.speed = *t++;
543 status.volume = *t++;
544 status.tone = *t++;
545 status.expression = *t++;
546 status.ext_dict_loaded = *t++;
547 status.ext_dict_status = *t++;
548 status.free_ram = *t++;
549 status.articulation = *t++;
550 status.reverb = *t++;
551 status.eob = *t++;
552 status.has_indexing = dtlk_has_indexing;
553 TRACE_RET;
554 return &status;
555 }
557 static char dtlk_read_tts(void)
558 {
559 int portval, retries = 0;
560 char ch;
561 TRACE_TEXT("(dtlk_read_tts");
563 /* verify DT is ready, read char, wait for ACK */
564 do {
565 portval = inb_p(dtlk_port_tts);
566 } while ((portval & TTS_READABLE) == 0 &&
567 retries++ < DTLK_MAX_RETRIES);
568 if (retries == DTLK_MAX_RETRIES)
569 printk(KERN_ERR "dtlk_read_tts() timeout\n");
571 ch = inb_p(dtlk_port_tts); /* input from TTS port */
572 ch &= 0x7f;
573 outb_p(ch, dtlk_port_tts);
575 retries = 0;
576 do {
577 portval = inb_p(dtlk_port_tts);
578 } while ((portval & TTS_READABLE) != 0 &&
579 retries++ < DTLK_MAX_RETRIES);
580 if (retries == DTLK_MAX_RETRIES)
581 printk(KERN_ERR "dtlk_read_tts() timeout\n");
583 TRACE_RET;
584 return ch;
585 }
587 static char dtlk_read_lpc(void)
588 {
589 int retries = 0;
590 char ch;
591 TRACE_TEXT("(dtlk_read_lpc");
593 /* no need to test -- this is only called when the port is readable */
595 ch = inb_p(dtlk_port_lpc); /* input from LPC port */
597 outb_p(0xff, dtlk_port_lpc);
599 /* acknowledging a read takes 3-4
600 usec. Here, we wait up to 20 usec
601 for the acknowledgement */
602 retries = (loops_per_jiffy * 20) / (1000000/HZ);
603 while (inb_p(dtlk_port_lpc) != 0x7f && --retries > 0);
604 if (retries == 0)
605 printk(KERN_ERR "dtlk_read_lpc() timeout\n");
607 TRACE_RET;
608 return ch;
609 }
611 /* write n bytes to tts port */
612 static char dtlk_write_bytes(const char *buf, int n)
613 {
614 char val = 0;
615 /* printk("dtlk_write_bytes(\"%-*s\", %d)\n", n, buf, n); */
616 TRACE_TEXT("(dtlk_write_bytes");
617 while (n-- > 0)
618 val = dtlk_write_tts(*buf++);
619 TRACE_RET;
620 return val;
621 }
623 static char dtlk_write_tts(char ch)
624 {
625 int retries = 0;
626 #ifdef TRACINGMORE
627 printk(" dtlk_write_tts(");
628 if (' ' <= ch && ch <= '~')
629 printk("'%c'", ch);
630 else
631 printk("0x%02x", ch);
632 #endif
633 if (ch != DTLK_CLEAR) /* no flow control for CLEAR command */
634 while ((inb_p(dtlk_port_tts) & TTS_WRITABLE) == 0 &&
635 retries++ < DTLK_MAX_RETRIES) /* DT ready? */
636 ;
637 if (retries == DTLK_MAX_RETRIES)
638 printk(KERN_ERR "dtlk_write_tts() timeout\n");
640 outb_p(ch, dtlk_port_tts); /* output to TTS port */
641 /* the RDY bit goes zero 2-3 usec after writing, and goes
642 1 again 180-190 usec later. Here, we wait up to 10
643 usec for the RDY bit to go zero. */
644 for (retries = 0; retries < loops_per_jiffy / (100000/HZ); retries++)
645 if ((inb_p(dtlk_port_tts) & TTS_WRITABLE) == 0)
646 break;
648 #ifdef TRACINGMORE
649 printk(")\n");
650 #endif
651 return 0;
652 }
654 MODULE_LICENSE("GPL");