projects / deliverable / linux.git / blob
? search:


3a2a6ccffe3fb472c5605255f092b5d9a0f4f087
[deliverable/linux.git] / drivers / staging / comedi / drivers / das16.c
1 /*
2 * das16.c
3 * DAS16 driver
4 *
5 * COMEDI - Linux Control and Measurement Device Interface
6 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
7 * Copyright (C) 2000 Chris R. Baugher <baugher@enteract.com>
8 * Copyright (C) 2001,2002 Frank Mori Hess <fmhess@users.sourceforge.net>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 */
20
21 /*
22 * Driver: das16
23 * Description: DAS16 compatible boards
24 * Author: Sam Moore, Warren Jasper, ds, Chris Baugher, Frank Hess, Roman Fietze
25 * Devices: [Keithley Metrabyte] DAS-16 (das-16), DAS-16G (das-16g),
26 * DAS-16F (das-16f), DAS-1201 (das-1201), DAS-1202 (das-1202),
27 * DAS-1401 (das-1401), DAS-1402 (das-1402), DAS-1601 (das-1601),
28 * DAS-1602 (das-1602),
29 * [ComputerBoards] PC104-DAS16/JR (pc104-das16jr),
30 * PC104-DAS16JR/16 (pc104-das16jr/16), CIO-DAS16 (cio-das16),
31 * CIO-DAS16F (cio-das16/f), CIO-DAS16/JR (cio-das16/jr),
32 * CIO-DAS16JR/16 (cio-das16jr/16), CIO-DAS1401/12 (cio-das1401/12),
33 * CIO-DAS1402/12 (cio-das1402/12), CIO-DAS1402/16 (cio-das1402/16),
34 * CIO-DAS1601/12 (cio-das1601/12), CIO-DAS1602/12 (cio-das1602/12),
35 * CIO-DAS1602/16 (cio-das1602/16), CIO-DAS16/330 (cio-das16/330)
36 * Status: works
37 * Updated: 2003-10-12
38 *
39 * A rewrite of the das16 and das1600 drivers.
40 *
41 * Options:
42 * [0] - base io address
43 * [1] - irq (does nothing, irq is not used anymore)
44 * [2] - dma channel (optional, required for comedi_command support)
45 * [3] - master clock speed in MHz (optional, 1 or 10, ignored if
46 * board can probe clock, defaults to 1)
47 * [4] - analog input range lowest voltage in microvolts (optional,
48 * only useful if your board does not have software
49 * programmable gain)
50 * [5] - analog input range highest voltage in microvolts (optional,
51 * only useful if board does not have software programmable
52 * gain)
53 * [6] - analog output range lowest voltage in microvolts (optional)
54 * [7] - analog output range highest voltage in microvolts (optional)
55 *
56 * Passing a zero for an option is the same as leaving it unspecified.
57 */
58
59 /*
60 * Testing and debugging help provided by Daniel Koch.
61 *
62 * Keithley Manuals:
63 * 2309.PDF (das16)
64 * 4919.PDF (das1400, 1600)
65 * 4922.PDF (das-1400)
66 * 4923.PDF (das1200, 1400, 1600)
67 *
68 * Computer boards manuals also available from their website
69 * www.measurementcomputing.com
70 */
71
72 #include <linux/module.h>
73 #include <linux/slab.h>
74 #include <linux/interrupt.h>
75
76 #include "../comedidev.h"
77
78 #include "comedi_isadma.h"
79 #include "comedi_fc.h"
80 #include "8253.h"
81 #include "8255.h"
82
83 #define DAS16_DMA_SIZE 0xff00 /* size in bytes of allocated dma buffer */
84
85 /*
86 * Register I/O map
87 */
88 #define DAS16_TRIG_REG 0x00
89 #define DAS16_AI_LSB_REG 0x00
90 #define DAS16_AI_MSB_REG 0x01
91 #define DAS16_MUX_REG 0x02
92 #define DAS16_DIO_REG 0x03
93 #define DAS16_AO_LSB_REG(x) ((x) ? 0x06 : 0x04)
94 #define DAS16_AO_MSB_REG(x) ((x) ? 0x07 : 0x05)
95 #define DAS16_STATUS_REG 0x08
96 #define DAS16_STATUS_BUSY (1 << 7)
97 #define DAS16_STATUS_UNIPOLAR (1 << 6)
98 #define DAS16_STATUS_MUXBIT (1 << 5)
99 #define DAS16_STATUS_INT (1 << 4)
100 #define DAS16_CTRL_REG 0x09
101 #define DAS16_CTRL_INTE (1 << 7)
102 #define DAS16_CTRL_IRQ(x) (((x) & 0x7) << 4)
103 #define DAS16_CTRL_DMAE (1 << 2)
104 #define DAS16_CTRL_PACING_MASK (3 << 0)
105 #define DAS16_CTRL_INT_PACER (3 << 0)
106 #define DAS16_CTRL_EXT_PACER (2 << 0)
107 #define DAS16_CTRL_SOFT_PACER (0 << 0)
108 #define DAS16_PACER_REG 0x0a
109 #define DAS16_PACER_BURST_LEN(x) (((x) & 0xf) << 4)
110 #define DAS16_PACER_CTR0 (1 << 1)
111 #define DAS16_PACER_TRIG0 (1 << 0)
112 #define DAS16_GAIN_REG 0x0b
113 #define DAS16_TIMER_BASE_REG 0x0c /* to 0x0f */
114
115 #define DAS1600_CONV_REG 0x404
116 #define DAS1600_CONV_DISABLE (1 << 6)
117 #define DAS1600_BURST_REG 0x405
118 #define DAS1600_BURST_VAL (1 << 6)
119 #define DAS1600_ENABLE_REG 0x406
120 #define DAS1600_ENABLE_VAL (1 << 6)
121 #define DAS1600_STATUS_REG 0x407
122 #define DAS1600_STATUS_BME (1 << 6)
123 #define DAS1600_STATUS_ME (1 << 5)
124 #define DAS1600_STATUS_CD (1 << 4)
125 #define DAS1600_STATUS_WS (1 << 1)
126 #define DAS1600_STATUS_CLK_10MHZ (1 << 0)
127
128 static const struct comedi_lrange range_das1x01_bip = {
129 4, {
130 BIP_RANGE(10),
131 BIP_RANGE(1),
132 BIP_RANGE(0.1),
133 BIP_RANGE(0.01)
134 }
135 };
136
137 static const struct comedi_lrange range_das1x01_unip = {
138 4, {
139 UNI_RANGE(10),
140 UNI_RANGE(1),
141 UNI_RANGE(0.1),
142 UNI_RANGE(0.01)
143 }
144 };
145
146 static const struct comedi_lrange range_das1x02_bip = {
147 4, {
148 BIP_RANGE(10),
149 BIP_RANGE(5),
150 BIP_RANGE(2.5),
151 BIP_RANGE(1.25)
152 }
153 };
154
155 static const struct comedi_lrange range_das1x02_unip = {
156 4, {
157 UNI_RANGE(10),
158 UNI_RANGE(5),
159 UNI_RANGE(2.5),
160 UNI_RANGE(1.25)
161 }
162 };
163
164 static const struct comedi_lrange range_das16jr = {
165 9, {
166 BIP_RANGE(10),
167 BIP_RANGE(5),
168 BIP_RANGE(2.5),
169 BIP_RANGE(1.25),
170 BIP_RANGE(0.625),
171 UNI_RANGE(10),
172 UNI_RANGE(5),
173 UNI_RANGE(2.5),
174 UNI_RANGE(1.25)
175 }
176 };
177
178 static const struct comedi_lrange range_das16jr_16 = {
179 8, {
180 BIP_RANGE(10),
181 BIP_RANGE(5),
182 BIP_RANGE(2.5),
183 BIP_RANGE(1.25),
184 UNI_RANGE(10),
185 UNI_RANGE(5),
186 UNI_RANGE(2.5),
187 UNI_RANGE(1.25)
188 }
189 };
190
191 static const int das16jr_gainlist[] = { 8, 0, 1, 2, 3, 4, 5, 6, 7 };
192 static const int das16jr_16_gainlist[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
193 static const int das1600_gainlist[] = { 0, 1, 2, 3 };
194
195 enum {
196 das16_pg_none = 0,
197 das16_pg_16jr,
198 das16_pg_16jr_16,
199 das16_pg_1601,
200 das16_pg_1602,
201 };
202 static const int *const das16_gainlists[] = {
203 NULL,
204 das16jr_gainlist,
205 das16jr_16_gainlist,
206 das1600_gainlist,
207 das1600_gainlist,
208 };
209
210 static const struct comedi_lrange *const das16_ai_uni_lranges[] = {
211 &range_unknown,
212 &range_das16jr,
213 &range_das16jr_16,
214 &range_das1x01_unip,
215 &range_das1x02_unip,
216 };
217
218 static const struct comedi_lrange *const das16_ai_bip_lranges[] = {
219 &range_unknown,
220 &range_das16jr,
221 &range_das16jr_16,
222 &range_das1x01_bip,
223 &range_das1x02_bip,
224 };
225
226 struct das16_board {
227 const char *name;
228 unsigned int ai_maxdata;
229 unsigned int ai_speed; /* max conversion speed in nanosec */
230 unsigned int ai_pg;
231 unsigned int has_ao:1;
232 unsigned int has_8255:1;
233
234 unsigned int i8255_offset;
235
236 unsigned int size;
237 unsigned int id;
238 };
239
240 static const struct das16_board das16_boards[] = {
241 {
242 .name = "das-16",
243 .ai_maxdata = 0x0fff,
244 .ai_speed = 15000,
245 .ai_pg = das16_pg_none,
246 .has_ao = 1,
247 .has_8255 = 1,
248 .i8255_offset = 0x10,
249 .size = 0x14,
250 .id = 0x00,
251 }, {
252 .name = "das-16g",
253 .ai_maxdata = 0x0fff,
254 .ai_speed = 15000,
255 .ai_pg = das16_pg_none,
256 .has_ao = 1,
257 .has_8255 = 1,
258 .i8255_offset = 0x10,
259 .size = 0x14,
260 .id = 0x00,
261 }, {
262 .name = "das-16f",
263 .ai_maxdata = 0x0fff,
264 .ai_speed = 8500,
265 .ai_pg = das16_pg_none,
266 .has_ao = 1,
267 .has_8255 = 1,
268 .i8255_offset = 0x10,
269 .size = 0x14,
270 .id = 0x00,
271 }, {
272 .name = "cio-das16",
273 .ai_maxdata = 0x0fff,
274 .ai_speed = 20000,
275 .ai_pg = das16_pg_none,
276 .has_ao = 1,
277 .has_8255 = 1,
278 .i8255_offset = 0x10,
279 .size = 0x14,
280 .id = 0x80,
281 }, {
282 .name = "cio-das16/f",
283 .ai_maxdata = 0x0fff,
284 .ai_speed = 10000,
285 .ai_pg = das16_pg_none,
286 .has_ao = 1,
287 .has_8255 = 1,
288 .i8255_offset = 0x10,
289 .size = 0x14,
290 .id = 0x80,
291 }, {
292 .name = "cio-das16/jr",
293 .ai_maxdata = 0x0fff,
294 .ai_speed = 7692,
295 .ai_pg = das16_pg_16jr,
296 .size = 0x10,
297 .id = 0x00,
298 }, {
299 .name = "pc104-das16jr",
300 .ai_maxdata = 0x0fff,
301 .ai_speed = 3300,
302 .ai_pg = das16_pg_16jr,
303 .size = 0x10,
304 .id = 0x00,
305 }, {
306 .name = "cio-das16jr/16",
307 .ai_maxdata = 0xffff,
308 .ai_speed = 10000,
309 .ai_pg = das16_pg_16jr_16,
310 .size = 0x10,
311 .id = 0x00,
312 }, {
313 .name = "pc104-das16jr/16",
314 .ai_maxdata = 0xffff,
315 .ai_speed = 10000,
316 .ai_pg = das16_pg_16jr_16,
317 .size = 0x10,
318 .id = 0x00,
319 }, {
320 .name = "das-1201",
321 .ai_maxdata = 0x0fff,
322 .ai_speed = 20000,
323 .ai_pg = das16_pg_none,
324 .has_8255 = 1,
325 .i8255_offset = 0x400,
326 .size = 0x408,
327 .id = 0x20,
328 }, {
329 .name = "das-1202",
330 .ai_maxdata = 0x0fff,
331 .ai_speed = 10000,
332 .ai_pg = das16_pg_none,
333 .has_8255 = 1,
334 .i8255_offset = 0x400,
335 .size = 0x408,
336 .id = 0x20,
337 }, {
338 .name = "das-1401",
339 .ai_maxdata = 0x0fff,
340 .ai_speed = 10000,
341 .ai_pg = das16_pg_1601,
342 .size = 0x408,
343 .id = 0xc0,
344 }, {
345 .name = "das-1402",
346 .ai_maxdata = 0x0fff,
347 .ai_speed = 10000,
348 .ai_pg = das16_pg_1602,
349 .size = 0x408,
350 .id = 0xc0,
351 }, {
352 .name = "das-1601",
353 .ai_maxdata = 0x0fff,
354 .ai_speed = 10000,
355 .ai_pg = das16_pg_1601,
356 .has_ao = 1,
357 .has_8255 = 1,
358 .i8255_offset = 0x400,
359 .size = 0x408,
360 .id = 0xc0,
361 }, {
362 .name = "das-1602",
363 .ai_maxdata = 0x0fff,
364 .ai_speed = 10000,
365 .ai_pg = das16_pg_1602,
366 .has_ao = 1,
367 .has_8255 = 1,
368 .i8255_offset = 0x400,
369 .size = 0x408,
370 .id = 0xc0,
371 }, {
372 .name = "cio-das1401/12",
373 .ai_maxdata = 0x0fff,
374 .ai_speed = 6250,
375 .ai_pg = das16_pg_1601,
376 .size = 0x408,
377 .id = 0xc0,
378 }, {
379 .name = "cio-das1402/12",
380 .ai_maxdata = 0x0fff,
381 .ai_speed = 6250,
382 .ai_pg = das16_pg_1602,
383 .size = 0x408,
384 .id = 0xc0,
385 }, {
386 .name = "cio-das1402/16",
387 .ai_maxdata = 0xffff,
388 .ai_speed = 10000,
389 .ai_pg = das16_pg_1602,
390 .size = 0x408,
391 .id = 0xc0,
392 }, {
393 .name = "cio-das1601/12",
394 .ai_maxdata = 0x0fff,
395 .ai_speed = 6250,
396 .ai_pg = das16_pg_1601,
397 .has_ao = 1,
398 .has_8255 = 1,
399 .i8255_offset = 0x400,
400 .size = 0x408,
401 .id = 0xc0,
402 }, {
403 .name = "cio-das1602/12",
404 .ai_maxdata = 0x0fff,
405 .ai_speed = 10000,
406 .ai_pg = das16_pg_1602,
407 .has_ao = 1,
408 .has_8255 = 1,
409 .i8255_offset = 0x400,
410 .size = 0x408,
411 .id = 0xc0,
412 }, {
413 .name = "cio-das1602/16",
414 .ai_maxdata = 0xffff,
415 .ai_speed = 10000,
416 .ai_pg = das16_pg_1602,
417 .has_ao = 1,
418 .has_8255 = 1,
419 .i8255_offset = 0x400,
420 .size = 0x408,
421 .id = 0xc0,
422 }, {
423 .name = "cio-das16/330",
424 .ai_maxdata = 0x0fff,
425 .ai_speed = 3030,
426 .ai_pg = das16_pg_16jr,
427 .size = 0x14,
428 .id = 0xf0,
429 },
430 };
431
432 /* Period for timer interrupt in jiffies. It's a function
433 * to deal with possibility of dynamic HZ patches */
434 static inline int timer_period(void)
435 {
436 return HZ / 20;
437 }
438
439 struct das16_private_struct {
440 struct comedi_isadma *dma;
441 unsigned int clockbase;
442 unsigned int ctrl_reg;
443 unsigned int divisor1;
444 unsigned int divisor2;
445 struct timer_list timer;
446 unsigned long extra_iobase;
447 unsigned int can_burst:1;
448 unsigned int timer_running:1;
449 };
450
451 static void das16_interrupt(struct comedi_device *dev)
452 {
453 struct das16_private_struct *devpriv = dev->private;
454 struct comedi_subdevice *s = dev->read_subdev;
455 struct comedi_async *async = s->async;
456 struct comedi_cmd *cmd = &async->cmd;
457 struct comedi_isadma *dma = devpriv->dma;
458 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
459 unsigned long spin_flags;
460 unsigned int residue;
461 unsigned int nbytes;
462 unsigned int nsamples;
463
464 spin_lock_irqsave(&dev->spinlock, spin_flags);
465 if (!(devpriv->ctrl_reg & DAS16_CTRL_DMAE)) {
466 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
467 return;
468 }
469
470 /*
471 * The pc104-das16jr (at least) has problems if the dma
472 * transfer is interrupted in the middle of transferring
473 * a 16 bit sample.
474 */
475 residue = comedi_isadma_disable_on_sample(desc->chan,
476 comedi_bytes_per_sample(s));
477
478 /* figure out how many samples to read */
479 if (residue > desc->size) {
480 dev_err(dev->class_dev, "residue > transfer size!\n");
481 async->events |= COMEDI_CB_ERROR;
482 nbytes = 0;
483 } else {
484 nbytes = desc->size - residue;
485 }
486 nsamples = comedi_bytes_to_samples(s, nbytes);
487
488 /* restart DMA if more samples are needed */
489 if (nsamples && nsamples < comedi_nsamples_left(s, nsamples + 1)) {
490 struct comedi_isadma_desc *nxt_desc;
491
492 dma->cur_dma = 1 - dma->cur_dma;
493 nxt_desc = &dma->desc[dma->cur_dma];
494 nxt_desc->size = nxt_desc->maxsize;
495 comedi_isadma_program(nxt_desc);
496 }
497
498 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
499
500 comedi_buf_write_samples(s, desc->virt_addr, nsamples);
501
502 if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg)
503 async->events |= COMEDI_CB_EOA;
504
505 comedi_handle_events(dev, s);
506 }
507
508 static void das16_timer_interrupt(unsigned long arg)
509 {
510 struct comedi_device *dev = (struct comedi_device *)arg;
511 struct das16_private_struct *devpriv = dev->private;
512 unsigned long flags;
513
514 das16_interrupt(dev);
515
516 spin_lock_irqsave(&dev->spinlock, flags);
517 if (devpriv->timer_running)
518 mod_timer(&devpriv->timer, jiffies + timer_period());
519 spin_unlock_irqrestore(&dev->spinlock, flags);
520 }
521
522 static int das16_ai_check_chanlist(struct comedi_device *dev,
523 struct comedi_subdevice *s,
524 struct comedi_cmd *cmd)
525 {
526 unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);
527 unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
528 int i;
529
530 for (i = 1; i < cmd->chanlist_len; i++) {
531 unsigned int chan = CR_CHAN(cmd->chanlist[i]);
532 unsigned int range = CR_RANGE(cmd->chanlist[i]);
533
534 if (chan != ((chan0 + i) % s->n_chan)) {
535 dev_dbg(dev->class_dev,
536 "entries in chanlist must be consecutive channels, counting upwards\n");
537 return -EINVAL;
538 }
539
540 if (range != range0) {
541 dev_dbg(dev->class_dev,
542 "entries in chanlist must all have the same gain\n");
543 return -EINVAL;
544 }
545 }
546
547 return 0;
548 }
549
550 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
551 struct comedi_cmd *cmd)
552 {
553 const struct das16_board *board = dev->board_ptr;
554 struct das16_private_struct *devpriv = dev->private;
555 int err = 0;
556 unsigned int trig_mask;
557 unsigned int arg;
558
559 /* Step 1 : check if triggers are trivially valid */
560
561 err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
562
563 trig_mask = TRIG_FOLLOW;
564 if (devpriv->can_burst)
565 trig_mask |= TRIG_TIMER | TRIG_EXT;
566 err |= cfc_check_trigger_src(&cmd->scan_begin_src, trig_mask);
567
568 trig_mask = TRIG_TIMER | TRIG_EXT;
569 if (devpriv->can_burst)
570 trig_mask |= TRIG_NOW;
571 err |= cfc_check_trigger_src(&cmd->convert_src, trig_mask);
572
573 err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
574 err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
575
576 if (err)
577 return 1;
578
579 /* Step 2a : make sure trigger sources are unique */
580
581 err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
582 err |= cfc_check_trigger_is_unique(cmd->convert_src);
583 err |= cfc_check_trigger_is_unique(cmd->stop_src);
584
585 /* Step 2b : and mutually compatible */
586
587 /* make sure scan_begin_src and convert_src dont conflict */
588 if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
589 err |= -EINVAL;
590 if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW)
591 err |= -EINVAL;
592
593 if (err)
594 return 2;
595
596 /* Step 3: check if arguments are trivially valid */
597
598 err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
599
600 if (cmd->scan_begin_src == TRIG_FOLLOW) /* internal trigger */
601 err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
602
603 err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
604
605 /* check against maximum frequency */
606 if (cmd->scan_begin_src == TRIG_TIMER)
607 err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
608 board->ai_speed * cmd->chanlist_len);
609
610 if (cmd->convert_src == TRIG_TIMER)
611 err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
612 board->ai_speed);
613
614 if (cmd->stop_src == TRIG_COUNT)
615 err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
616 else /* TRIG_NONE */
617 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
618
619 if (err)
620 return 3;
621
622 /* step 4: fix up arguments */
623 if (cmd->scan_begin_src == TRIG_TIMER) {
624 arg = cmd->scan_begin_arg;
625 i8253_cascade_ns_to_timer(devpriv->clockbase,
626 &devpriv->divisor1,
627 &devpriv->divisor2,
628 &arg, cmd->flags);
629 err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
630 }
631 if (cmd->convert_src == TRIG_TIMER) {
632 arg = cmd->convert_arg;
633 i8253_cascade_ns_to_timer(devpriv->clockbase,
634 &devpriv->divisor1,
635 &devpriv->divisor2,
636 &arg, cmd->flags);
637 err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
638 }
639 if (err)
640 return 4;
641
642 /* Step 5: check channel list if it exists */
643 if (cmd->chanlist && cmd->chanlist_len > 0)
644 err |= das16_ai_check_chanlist(dev, s, cmd);
645
646 if (err)
647 return 5;
648
649 return 0;
650 }
651
652 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
653 unsigned int flags)
654 {
655 struct das16_private_struct *devpriv = dev->private;
656 unsigned long timer_base = dev->iobase + DAS16_TIMER_BASE_REG;
657
658 i8253_cascade_ns_to_timer(devpriv->clockbase,
659 &devpriv->divisor1, &devpriv->divisor2,
660 &ns, flags);
661
662 i8254_set_mode(timer_base, 0, 1, I8254_MODE2 | I8254_BINARY);
663 i8254_set_mode(timer_base, 0, 2, I8254_MODE2 | I8254_BINARY);
664 i8254_write(timer_base, 0, 1, devpriv->divisor1);
665 i8254_write(timer_base, 0, 2, devpriv->divisor2);
666
667 return ns;
668 }
669
670 static int das16_cmd_exec(struct comedi_device *dev, struct comedi_subdevice *s)
671 {
672 const struct das16_board *board = dev->board_ptr;
673 struct das16_private_struct *devpriv = dev->private;
674 struct comedi_isadma *dma = devpriv->dma;
675 struct comedi_isadma_desc *desc = &dma->desc[0];
676 struct comedi_async *async = s->async;
677 struct comedi_cmd *cmd = &async->cmd;
678 unsigned int byte;
679 unsigned long flags;
680 int range;
681
682 if (cmd->flags & CMDF_PRIORITY) {
683 dev_err(dev->class_dev,
684 "isa dma transfers cannot be performed with CMDF_PRIORITY, aborting\n");
685 return -1;
686 }
687
688 if (devpriv->can_burst)
689 outb(DAS1600_CONV_DISABLE, dev->iobase + DAS1600_CONV_REG);
690
691 /* set scan limits */
692 byte = CR_CHAN(cmd->chanlist[0]);
693 byte |= CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]) << 4;
694 outb(byte, dev->iobase + DAS16_MUX_REG);
695
696 /* set gain (this is also burst rate register but according to
697 * computer boards manual, burst rate does nothing, even on
698 * keithley cards) */
699 if (board->ai_pg != das16_pg_none) {
700 range = CR_RANGE(cmd->chanlist[0]);
701 outb((das16_gainlists[board->ai_pg])[range],
702 dev->iobase + DAS16_GAIN_REG);
703 }
704
705 /* set counter mode and counts */
706 cmd->convert_arg = das16_set_pacer(dev, cmd->convert_arg, cmd->flags);
707
708 /* enable counters */
709 byte = 0;
710 if (devpriv->can_burst) {
711 if (cmd->convert_src == TRIG_NOW) {
712 outb(DAS1600_BURST_VAL,
713 dev->iobase + DAS1600_BURST_REG);
714 /* set burst length */
715 byte |= DAS16_PACER_BURST_LEN(cmd->chanlist_len - 1);
716 } else {
717 outb(0, dev->iobase + DAS1600_BURST_REG);
718 }
719 }
720 outb(byte, dev->iobase + DAS16_PACER_REG);
721
722 /* set up dma transfer */
723 dma->cur_dma = 0;
724 desc->size = desc->maxsize;
725 comedi_isadma_program(desc);
726
727 /* set up timer */
728 spin_lock_irqsave(&dev->spinlock, flags);
729 devpriv->timer_running = 1;
730 devpriv->timer.expires = jiffies + timer_period();
731 add_timer(&devpriv->timer);
732
733 /* enable DMA interrupt with external or internal pacing */
734 devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_PACING_MASK);
735 devpriv->ctrl_reg |= DAS16_CTRL_DMAE;
736 if (cmd->convert_src == TRIG_EXT)
737 devpriv->ctrl_reg |= DAS16_CTRL_EXT_PACER;
738 else
739 devpriv->ctrl_reg |= DAS16_CTRL_INT_PACER;
740 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
741
742 if (devpriv->can_burst)
743 outb(0, dev->iobase + DAS1600_CONV_REG);
744 spin_unlock_irqrestore(&dev->spinlock, flags);
745
746 return 0;
747 }
748
749 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
750 {
751 struct das16_private_struct *devpriv = dev->private;
752 struct comedi_isadma *dma = devpriv->dma;
753 unsigned long flags;
754
755 spin_lock_irqsave(&dev->spinlock, flags);
756
757 /* disable interrupts, dma and pacer clocked conversions */
758 devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_DMAE |
759 DAS16_CTRL_PACING_MASK);
760 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
761
762 comedi_isadma_disable(dma->chan);
763
764 /* disable SW timer */
765 if (devpriv->timer_running) {
766 devpriv->timer_running = 0;
767 del_timer(&devpriv->timer);
768 }
769
770 if (devpriv->can_burst)
771 outb(0, dev->iobase + DAS1600_BURST_REG);
772
773 spin_unlock_irqrestore(&dev->spinlock, flags);
774
775 return 0;
776 }
777
778 static void das16_ai_munge(struct comedi_device *dev,
779 struct comedi_subdevice *s, void *array,
780 unsigned int num_bytes,
781 unsigned int start_chan_index)
782 {
783 unsigned short *data = array;
784 unsigned int num_samples = comedi_bytes_to_samples(s, num_bytes);
785 unsigned int i;
786
787 for (i = 0; i < num_samples; i++) {
788 data[i] = le16_to_cpu(data[i]);
789 if (s->maxdata == 0x0fff)
790 data[i] >>= 4;
791 data[i] &= s->maxdata;
792 }
793 }
794
795 static int das16_ai_eoc(struct comedi_device *dev,
796 struct comedi_subdevice *s,
797 struct comedi_insn *insn,
798 unsigned long context)
799 {
800 unsigned int status;
801
802 status = inb(dev->iobase + DAS16_STATUS_REG);
803 if ((status & DAS16_STATUS_BUSY) == 0)
804 return 0;
805 return -EBUSY;
806 }
807
808 static int das16_ai_insn_read(struct comedi_device *dev,
809 struct comedi_subdevice *s,
810 struct comedi_insn *insn,
811 unsigned int *data)
812 {
813 const struct das16_board *board = dev->board_ptr;
814 unsigned int chan = CR_CHAN(insn->chanspec);
815 unsigned int range = CR_RANGE(insn->chanspec);
816 unsigned int val;
817 int ret;
818 int i;
819
820 /* set multiplexer */
821 outb(chan | (chan << 4), dev->iobase + DAS16_MUX_REG);
822
823 /* set gain */
824 if (board->ai_pg != das16_pg_none) {
825 outb((das16_gainlists[board->ai_pg])[range],
826 dev->iobase + DAS16_GAIN_REG);
827 }
828
829 for (i = 0; i < insn->n; i++) {
830 /* trigger conversion */
831 outb_p(0, dev->iobase + DAS16_TRIG_REG);
832
833 ret = comedi_timeout(dev, s, insn, das16_ai_eoc, 0);
834 if (ret)
835 return ret;
836
837 val = inb(dev->iobase + DAS16_AI_MSB_REG) << 8;
838 val |= inb(dev->iobase + DAS16_AI_LSB_REG);
839 if (s->maxdata == 0x0fff)
840 val >>= 4;
841 val &= s->maxdata;
842
843 data[i] = val;
844 }
845
846 return insn->n;
847 }
848
849 static int das16_ao_insn_write(struct comedi_device *dev,
850 struct comedi_subdevice *s,
851 struct comedi_insn *insn,
852 unsigned int *data)
853 {
854 unsigned int chan = CR_CHAN(insn->chanspec);
855 int i;
856
857 for (i = 0; i < insn->n; i++) {
858 unsigned int val = data[i];
859
860 s->readback[chan] = val;
861
862 val <<= 4;
863
864 outb(val & 0xff, dev->iobase + DAS16_AO_LSB_REG(chan));
865 outb((val >> 8) & 0xff, dev->iobase + DAS16_AO_MSB_REG(chan));
866 }
867
868 return insn->n;
869 }
870
871 static int das16_di_insn_bits(struct comedi_device *dev,
872 struct comedi_subdevice *s,
873 struct comedi_insn *insn,
874 unsigned int *data)
875 {
876 data[1] = inb(dev->iobase + DAS16_DIO_REG) & 0xf;
877
878 return insn->n;
879 }
880
881 static int das16_do_insn_bits(struct comedi_device *dev,
882 struct comedi_subdevice *s,
883 struct comedi_insn *insn,
884 unsigned int *data)
885 {
886 if (comedi_dio_update_state(s, data))
887 outb(s->state, dev->iobase + DAS16_DIO_REG);
888
889 data[1] = s->state;
890
891 return insn->n;
892 }
893
894 static int das16_probe(struct comedi_device *dev, struct comedi_devconfig *it)
895 {
896 const struct das16_board *board = dev->board_ptr;
897 int diobits;
898
899 /* diobits indicates boards */
900 diobits = inb(dev->iobase + DAS16_DIO_REG) & 0xf0;
901 if (board->id != diobits) {
902 dev_err(dev->class_dev,
903 "requested board's id bits are incorrect (0x%x != 0x%x)\n",
904 board->id, diobits);
905 return -EINVAL;
906 }
907
908 return 0;
909 }
910
911 static void das16_reset(struct comedi_device *dev)
912 {
913 outb(0, dev->iobase + DAS16_STATUS_REG);
914 outb(0, dev->iobase + DAS16_CTRL_REG);
915 outb(0, dev->iobase + DAS16_PACER_REG);
916 outb(0, dev->iobase + DAS16_TIMER_BASE_REG + i8254_control_reg);
917 }
918
919 static void das16_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
920 {
921 struct das16_private_struct *devpriv = dev->private;
922
923 /* only DMA channels 3 and 1 are valid */
924 if (!(dma_chan == 1 || dma_chan == 3))
925 return;
926
927 /* DMA uses two buffers */
928 devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan, dma_chan,
929 DAS16_DMA_SIZE, COMEDI_ISADMA_READ);
930 if (devpriv->dma) {
931 init_timer(&devpriv->timer);
932 devpriv->timer.function = das16_timer_interrupt;
933 devpriv->timer.data = (unsigned long)dev;
934 }
935 }
936
937 static void das16_free_dma(struct comedi_device *dev)
938 {
939 struct das16_private_struct *devpriv = dev->private;
940
941 if (devpriv) {
942 if (devpriv->timer.data)
943 del_timer_sync(&devpriv->timer);
944 comedi_isadma_free(devpriv->dma);
945 }
946 }
947
948 static const struct comedi_lrange *das16_ai_range(struct comedi_device *dev,
949 struct comedi_subdevice *s,
950 struct comedi_devconfig *it,
951 unsigned int pg_type,
952 unsigned int status)
953 {
954 unsigned int min = it->options[4];
955 unsigned int max = it->options[5];
956
957 /* get any user-defined input range */
958 if (pg_type == das16_pg_none && (min || max)) {
959 struct comedi_lrange *lrange;
960 struct comedi_krange *krange;
961
962 /* allocate single-range range table */
963 lrange = comedi_alloc_spriv(s,
964 sizeof(*lrange) + sizeof(*krange));
965 if (!lrange)
966 return &range_unknown;
967
968 /* initialize ai range */
969 lrange->length = 1;
970 krange = lrange->range;
971 krange->min = min;
972 krange->max = max;
973 krange->flags = UNIT_volt;
974
975 return lrange;
976 }
977
978 /* use software programmable range */
979 if (status & DAS16_STATUS_UNIPOLAR)
980 return das16_ai_uni_lranges[pg_type];
981 return das16_ai_bip_lranges[pg_type];
982 }
983
984 static const struct comedi_lrange *das16_ao_range(struct comedi_device *dev,
985 struct comedi_subdevice *s,
986 struct comedi_devconfig *it)
987 {
988 unsigned int min = it->options[6];
989 unsigned int max = it->options[7];
990
991 /* get any user-defined output range */
992 if (min || max) {
993 struct comedi_lrange *lrange;
994 struct comedi_krange *krange;
995
996 /* allocate single-range range table */
997 lrange = comedi_alloc_spriv(s,
998 sizeof(*lrange) + sizeof(*krange));
999 if (!lrange)
1000 return &range_unknown;
1001
1002 /* initialize ao range */
1003 lrange->length = 1;
1004 krange = lrange->range;
1005 krange->min = min;
1006 krange->max = max;
1007 krange->flags = UNIT_volt;
1008
1009 return lrange;
1010 }
1011
1012 return &range_unknown;
1013 }
1014
1015 static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1016 {
1017 const struct das16_board *board = dev->board_ptr;
1018 struct das16_private_struct *devpriv;
1019 struct comedi_subdevice *s;
1020 unsigned int status;
1021 int ret;
1022
1023 /* check that clock setting is valid */
1024 if (it->options[3]) {
1025 if (it->options[3] != 0 &&
1026 it->options[3] != 1 && it->options[3] != 10) {
1027 dev_err(dev->class_dev,
1028 "Invalid option. Master clock must be set to 1 or 10 (MHz)\n");
1029 return -EINVAL;
1030 }
1031 }
1032
1033 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
1034 if (!devpriv)
1035 return -ENOMEM;
1036
1037 if (board->size < 0x400) {
1038 ret = comedi_request_region(dev, it->options[0], board->size);
1039 if (ret)
1040 return ret;
1041 } else {
1042 ret = comedi_request_region(dev, it->options[0], 0x10);
1043 if (ret)
1044 return ret;
1045 /* Request an additional region for the 8255 */
1046 ret = __comedi_request_region(dev, dev->iobase + 0x400,
1047 board->size & 0x3ff);
1048 if (ret)
1049 return ret;
1050 devpriv->extra_iobase = dev->iobase + 0x400;
1051 devpriv->can_burst = 1;
1052 }
1053
1054 /* probe id bits to make sure they are consistent */
1055 if (das16_probe(dev, it))
1056 return -EINVAL;
1057
1058 /* get master clock speed */
1059 if (devpriv->can_burst) {
1060 status = inb(dev->iobase + DAS1600_STATUS_REG);
1061
1062 if (status & DAS1600_STATUS_CLK_10MHZ)
1063 devpriv->clockbase = I8254_OSC_BASE_10MHZ;
1064 else
1065 devpriv->clockbase = I8254_OSC_BASE_1MHZ;
1066 } else {
1067 if (it->options[3])
1068 devpriv->clockbase = I8254_OSC_BASE_1MHZ /
1069 it->options[3];
1070 else
1071 devpriv->clockbase = I8254_OSC_BASE_1MHZ;
1072 }
1073
1074 das16_alloc_dma(dev, it->options[2]);
1075
1076 ret = comedi_alloc_subdevices(dev, 4 + board->has_8255);
1077 if (ret)
1078 return ret;
1079
1080 status = inb(dev->iobase + DAS16_STATUS_REG);
1081
1082 /* Analog Input subdevice */
1083 s = &dev->subdevices[0];
1084 s->type = COMEDI_SUBD_AI;
1085 s->subdev_flags = SDF_READABLE;
1086 if (status & DAS16_STATUS_MUXBIT) {
1087 s->subdev_flags |= SDF_GROUND;
1088 s->n_chan = 16;
1089 } else {
1090 s->subdev_flags |= SDF_DIFF;
1091 s->n_chan = 8;
1092 }
1093 s->len_chanlist = s->n_chan;
1094 s->maxdata = board->ai_maxdata;
1095 s->range_table = das16_ai_range(dev, s, it, board->ai_pg, status);
1096 s->insn_read = das16_ai_insn_read;
1097 if (devpriv->dma) {
1098 dev->read_subdev = s;
1099 s->subdev_flags |= SDF_CMD_READ;
1100 s->do_cmdtest = das16_cmd_test;
1101 s->do_cmd = das16_cmd_exec;
1102 s->cancel = das16_cancel;
1103 s->munge = das16_ai_munge;
1104 }
1105
1106 /* Analog Output subdevice */
1107 s = &dev->subdevices[1];
1108 if (board->has_ao) {
1109 s->type = COMEDI_SUBD_AO;
1110 s->subdev_flags = SDF_WRITABLE;
1111 s->n_chan = 2;
1112 s->maxdata = 0x0fff;
1113 s->range_table = das16_ao_range(dev, s, it);
1114 s->insn_write = das16_ao_insn_write;
1115
1116 ret = comedi_alloc_subdev_readback(s);
1117 if (ret)
1118 return ret;
1119 } else {
1120 s->type = COMEDI_SUBD_UNUSED;
1121 }
1122
1123 /* Digital Input subdevice */
1124 s = &dev->subdevices[2];
1125 s->type = COMEDI_SUBD_DI;
1126 s->subdev_flags = SDF_READABLE;
1127 s->n_chan = 4;
1128 s->maxdata = 1;
1129 s->range_table = &range_digital;
1130 s->insn_bits = das16_di_insn_bits;
1131
1132 /* Digital Output subdevice */
1133 s = &dev->subdevices[3];
1134 s->type = COMEDI_SUBD_DO;
1135 s->subdev_flags = SDF_WRITABLE;
1136 s->n_chan = 4;
1137 s->maxdata = 1;
1138 s->range_table = &range_digital;
1139 s->insn_bits = das16_do_insn_bits;
1140
1141 /* initialize digital output lines */
1142 outb(s->state, dev->iobase + DAS16_DIO_REG);
1143
1144 /* 8255 Digital I/O subdevice */
1145 if (board->has_8255) {
1146 s = &dev->subdevices[4];
1147 ret = subdev_8255_init(dev, s, NULL, board->i8255_offset);
1148 if (ret)
1149 return ret;
1150 }
1151
1152 das16_reset(dev);
1153 /* set the interrupt level */
1154 devpriv->ctrl_reg = DAS16_CTRL_IRQ(dev->irq);
1155 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
1156
1157 if (devpriv->can_burst) {
1158 outb(DAS1600_ENABLE_VAL, dev->iobase + DAS1600_ENABLE_REG);
1159 outb(0, dev->iobase + DAS1600_CONV_REG);
1160 outb(0, dev->iobase + DAS1600_BURST_REG);
1161 }
1162
1163 return 0;
1164 }
1165
1166 static void das16_detach(struct comedi_device *dev)
1167 {
1168 const struct das16_board *board = dev->board_ptr;
1169 struct das16_private_struct *devpriv = dev->private;
1170
1171 if (devpriv) {
1172 if (dev->iobase)
1173 das16_reset(dev);
1174 das16_free_dma(dev);
1175
1176 if (devpriv->extra_iobase)
1177 release_region(devpriv->extra_iobase,
1178 board->size & 0x3ff);
1179 }
1180
1181 comedi_legacy_detach(dev);
1182 }
1183
1184 static struct comedi_driver das16_driver = {
1185 .driver_name = "das16",
1186 .module = THIS_MODULE,
1187 .attach = das16_attach,
1188 .detach = das16_detach,
1189 .board_name = &das16_boards[0].name,
1190 .num_names = ARRAY_SIZE(das16_boards),
1191 .offset = sizeof(das16_boards[0]),
1192 };
1193 module_comedi_driver(das16_driver);
1194
1195 MODULE_AUTHOR("Comedi http://www.comedi.org");
1196 MODULE_DESCRIPTION("Comedi driver for DAS16 compatible boards");
1197 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
This page took 0.056551 seconds and 4 git commands to generate.