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[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_8254.h"
80 #include "8255.h"
81
82 #define DAS16_DMA_SIZE 0xff00 /* size in bytes of allocated dma buffer */
83
84 /*
85 * Register I/O map
86 */
87 #define DAS16_TRIG_REG 0x00
88 #define DAS16_AI_LSB_REG 0x00
89 #define DAS16_AI_MSB_REG 0x01
90 #define DAS16_MUX_REG 0x02
91 #define DAS16_DIO_REG 0x03
92 #define DAS16_AO_LSB_REG(x) ((x) ? 0x06 : 0x04)
93 #define DAS16_AO_MSB_REG(x) ((x) ? 0x07 : 0x05)
94 #define DAS16_STATUS_REG 0x08
95 #define DAS16_STATUS_BUSY (1 << 7)
96 #define DAS16_STATUS_UNIPOLAR (1 << 6)
97 #define DAS16_STATUS_MUXBIT (1 << 5)
98 #define DAS16_STATUS_INT (1 << 4)
99 #define DAS16_CTRL_REG 0x09
100 #define DAS16_CTRL_INTE (1 << 7)
101 #define DAS16_CTRL_IRQ(x) (((x) & 0x7) << 4)
102 #define DAS16_CTRL_DMAE (1 << 2)
103 #define DAS16_CTRL_PACING_MASK (3 << 0)
104 #define DAS16_CTRL_INT_PACER (3 << 0)
105 #define DAS16_CTRL_EXT_PACER (2 << 0)
106 #define DAS16_CTRL_SOFT_PACER (0 << 0)
107 #define DAS16_PACER_REG 0x0a
108 #define DAS16_PACER_BURST_LEN(x) (((x) & 0xf) << 4)
109 #define DAS16_PACER_CTR0 (1 << 1)
110 #define DAS16_PACER_TRIG0 (1 << 0)
111 #define DAS16_GAIN_REG 0x0b
112 #define DAS16_TIMER_BASE_REG 0x0c /* to 0x0f */
113
114 #define DAS1600_CONV_REG 0x404
115 #define DAS1600_CONV_DISABLE (1 << 6)
116 #define DAS1600_BURST_REG 0x405
117 #define DAS1600_BURST_VAL (1 << 6)
118 #define DAS1600_ENABLE_REG 0x406
119 #define DAS1600_ENABLE_VAL (1 << 6)
120 #define DAS1600_STATUS_REG 0x407
121 #define DAS1600_STATUS_BME (1 << 6)
122 #define DAS1600_STATUS_ME (1 << 5)
123 #define DAS1600_STATUS_CD (1 << 4)
124 #define DAS1600_STATUS_WS (1 << 1)
125 #define DAS1600_STATUS_CLK_10MHZ (1 << 0)
126
127 static const struct comedi_lrange range_das1x01_bip = {
128 4, {
129 BIP_RANGE(10),
130 BIP_RANGE(1),
131 BIP_RANGE(0.1),
132 BIP_RANGE(0.01)
133 }
134 };
135
136 static const struct comedi_lrange range_das1x01_unip = {
137 4, {
138 UNI_RANGE(10),
139 UNI_RANGE(1),
140 UNI_RANGE(0.1),
141 UNI_RANGE(0.01)
142 }
143 };
144
145 static const struct comedi_lrange range_das1x02_bip = {
146 4, {
147 BIP_RANGE(10),
148 BIP_RANGE(5),
149 BIP_RANGE(2.5),
150 BIP_RANGE(1.25)
151 }
152 };
153
154 static const struct comedi_lrange range_das1x02_unip = {
155 4, {
156 UNI_RANGE(10),
157 UNI_RANGE(5),
158 UNI_RANGE(2.5),
159 UNI_RANGE(1.25)
160 }
161 };
162
163 static const struct comedi_lrange range_das16jr = {
164 9, {
165 BIP_RANGE(10),
166 BIP_RANGE(5),
167 BIP_RANGE(2.5),
168 BIP_RANGE(1.25),
169 BIP_RANGE(0.625),
170 UNI_RANGE(10),
171 UNI_RANGE(5),
172 UNI_RANGE(2.5),
173 UNI_RANGE(1.25)
174 }
175 };
176
177 static const struct comedi_lrange range_das16jr_16 = {
178 8, {
179 BIP_RANGE(10),
180 BIP_RANGE(5),
181 BIP_RANGE(2.5),
182 BIP_RANGE(1.25),
183 UNI_RANGE(10),
184 UNI_RANGE(5),
185 UNI_RANGE(2.5),
186 UNI_RANGE(1.25)
187 }
188 };
189
190 static const int das16jr_gainlist[] = { 8, 0, 1, 2, 3, 4, 5, 6, 7 };
191 static const int das16jr_16_gainlist[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
192 static const int das1600_gainlist[] = { 0, 1, 2, 3 };
193
194 enum {
195 das16_pg_none = 0,
196 das16_pg_16jr,
197 das16_pg_16jr_16,
198 das16_pg_1601,
199 das16_pg_1602,
200 };
201 static const int *const das16_gainlists[] = {
202 NULL,
203 das16jr_gainlist,
204 das16jr_16_gainlist,
205 das1600_gainlist,
206 das1600_gainlist,
207 };
208
209 static const struct comedi_lrange *const das16_ai_uni_lranges[] = {
210 &range_unknown,
211 &range_das16jr,
212 &range_das16jr_16,
213 &range_das1x01_unip,
214 &range_das1x02_unip,
215 };
216
217 static const struct comedi_lrange *const das16_ai_bip_lranges[] = {
218 &range_unknown,
219 &range_das16jr,
220 &range_das16jr_16,
221 &range_das1x01_bip,
222 &range_das1x02_bip,
223 };
224
225 struct das16_board {
226 const char *name;
227 unsigned int ai_maxdata;
228 unsigned int ai_speed; /* max conversion speed in nanosec */
229 unsigned int ai_pg;
230 unsigned int has_ao:1;
231 unsigned int has_8255:1;
232
233 unsigned int i8255_offset;
234
235 unsigned int size;
236 unsigned int id;
237 };
238
239 static const struct das16_board das16_boards[] = {
240 {
241 .name = "das-16",
242 .ai_maxdata = 0x0fff,
243 .ai_speed = 15000,
244 .ai_pg = das16_pg_none,
245 .has_ao = 1,
246 .has_8255 = 1,
247 .i8255_offset = 0x10,
248 .size = 0x14,
249 .id = 0x00,
250 }, {
251 .name = "das-16g",
252 .ai_maxdata = 0x0fff,
253 .ai_speed = 15000,
254 .ai_pg = das16_pg_none,
255 .has_ao = 1,
256 .has_8255 = 1,
257 .i8255_offset = 0x10,
258 .size = 0x14,
259 .id = 0x00,
260 }, {
261 .name = "das-16f",
262 .ai_maxdata = 0x0fff,
263 .ai_speed = 8500,
264 .ai_pg = das16_pg_none,
265 .has_ao = 1,
266 .has_8255 = 1,
267 .i8255_offset = 0x10,
268 .size = 0x14,
269 .id = 0x00,
270 }, {
271 .name = "cio-das16",
272 .ai_maxdata = 0x0fff,
273 .ai_speed = 20000,
274 .ai_pg = das16_pg_none,
275 .has_ao = 1,
276 .has_8255 = 1,
277 .i8255_offset = 0x10,
278 .size = 0x14,
279 .id = 0x80,
280 }, {
281 .name = "cio-das16/f",
282 .ai_maxdata = 0x0fff,
283 .ai_speed = 10000,
284 .ai_pg = das16_pg_none,
285 .has_ao = 1,
286 .has_8255 = 1,
287 .i8255_offset = 0x10,
288 .size = 0x14,
289 .id = 0x80,
290 }, {
291 .name = "cio-das16/jr",
292 .ai_maxdata = 0x0fff,
293 .ai_speed = 7692,
294 .ai_pg = das16_pg_16jr,
295 .size = 0x10,
296 .id = 0x00,
297 }, {
298 .name = "pc104-das16jr",
299 .ai_maxdata = 0x0fff,
300 .ai_speed = 3300,
301 .ai_pg = das16_pg_16jr,
302 .size = 0x10,
303 .id = 0x00,
304 }, {
305 .name = "cio-das16jr/16",
306 .ai_maxdata = 0xffff,
307 .ai_speed = 10000,
308 .ai_pg = das16_pg_16jr_16,
309 .size = 0x10,
310 .id = 0x00,
311 }, {
312 .name = "pc104-das16jr/16",
313 .ai_maxdata = 0xffff,
314 .ai_speed = 10000,
315 .ai_pg = das16_pg_16jr_16,
316 .size = 0x10,
317 .id = 0x00,
318 }, {
319 .name = "das-1201",
320 .ai_maxdata = 0x0fff,
321 .ai_speed = 20000,
322 .ai_pg = das16_pg_none,
323 .has_8255 = 1,
324 .i8255_offset = 0x400,
325 .size = 0x408,
326 .id = 0x20,
327 }, {
328 .name = "das-1202",
329 .ai_maxdata = 0x0fff,
330 .ai_speed = 10000,
331 .ai_pg = das16_pg_none,
332 .has_8255 = 1,
333 .i8255_offset = 0x400,
334 .size = 0x408,
335 .id = 0x20,
336 }, {
337 .name = "das-1401",
338 .ai_maxdata = 0x0fff,
339 .ai_speed = 10000,
340 .ai_pg = das16_pg_1601,
341 .size = 0x408,
342 .id = 0xc0,
343 }, {
344 .name = "das-1402",
345 .ai_maxdata = 0x0fff,
346 .ai_speed = 10000,
347 .ai_pg = das16_pg_1602,
348 .size = 0x408,
349 .id = 0xc0,
350 }, {
351 .name = "das-1601",
352 .ai_maxdata = 0x0fff,
353 .ai_speed = 10000,
354 .ai_pg = das16_pg_1601,
355 .has_ao = 1,
356 .has_8255 = 1,
357 .i8255_offset = 0x400,
358 .size = 0x408,
359 .id = 0xc0,
360 }, {
361 .name = "das-1602",
362 .ai_maxdata = 0x0fff,
363 .ai_speed = 10000,
364 .ai_pg = das16_pg_1602,
365 .has_ao = 1,
366 .has_8255 = 1,
367 .i8255_offset = 0x400,
368 .size = 0x408,
369 .id = 0xc0,
370 }, {
371 .name = "cio-das1401/12",
372 .ai_maxdata = 0x0fff,
373 .ai_speed = 6250,
374 .ai_pg = das16_pg_1601,
375 .size = 0x408,
376 .id = 0xc0,
377 }, {
378 .name = "cio-das1402/12",
379 .ai_maxdata = 0x0fff,
380 .ai_speed = 6250,
381 .ai_pg = das16_pg_1602,
382 .size = 0x408,
383 .id = 0xc0,
384 }, {
385 .name = "cio-das1402/16",
386 .ai_maxdata = 0xffff,
387 .ai_speed = 10000,
388 .ai_pg = das16_pg_1602,
389 .size = 0x408,
390 .id = 0xc0,
391 }, {
392 .name = "cio-das1601/12",
393 .ai_maxdata = 0x0fff,
394 .ai_speed = 6250,
395 .ai_pg = das16_pg_1601,
396 .has_ao = 1,
397 .has_8255 = 1,
398 .i8255_offset = 0x400,
399 .size = 0x408,
400 .id = 0xc0,
401 }, {
402 .name = "cio-das1602/12",
403 .ai_maxdata = 0x0fff,
404 .ai_speed = 10000,
405 .ai_pg = das16_pg_1602,
406 .has_ao = 1,
407 .has_8255 = 1,
408 .i8255_offset = 0x400,
409 .size = 0x408,
410 .id = 0xc0,
411 }, {
412 .name = "cio-das1602/16",
413 .ai_maxdata = 0xffff,
414 .ai_speed = 10000,
415 .ai_pg = das16_pg_1602,
416 .has_ao = 1,
417 .has_8255 = 1,
418 .i8255_offset = 0x400,
419 .size = 0x408,
420 .id = 0xc0,
421 }, {
422 .name = "cio-das16/330",
423 .ai_maxdata = 0x0fff,
424 .ai_speed = 3030,
425 .ai_pg = das16_pg_16jr,
426 .size = 0x14,
427 .id = 0xf0,
428 },
429 };
430
431 /* Period for timer interrupt in jiffies. It's a function
432 * to deal with possibility of dynamic HZ patches */
433 static inline int timer_period(void)
434 {
435 return HZ / 20;
436 }
437
438 struct das16_private_struct {
439 struct comedi_isadma *dma;
440 unsigned int clockbase;
441 unsigned int ctrl_reg;
442 unsigned int divisor1;
443 unsigned int divisor2;
444 struct timer_list timer;
445 unsigned long extra_iobase;
446 unsigned int can_burst:1;
447 unsigned int timer_running:1;
448 };
449
450 static void das16_ai_setup_dma(struct comedi_device *dev,
451 struct comedi_subdevice *s,
452 unsigned int unread_samples)
453 {
454 struct das16_private_struct *devpriv = dev->private;
455 struct comedi_isadma *dma = devpriv->dma;
456 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
457 unsigned int max_samples = comedi_bytes_to_samples(s, desc->maxsize);
458 unsigned int nsamples;
459
460 /*
461 * Determine dma size based on the buffer size plus the number of
462 * unread samples and the number of samples remaining in the command.
463 */
464 nsamples = comedi_nsamples_left(s, max_samples + unread_samples);
465 if (nsamples > unread_samples) {
466 nsamples -= unread_samples;
467 desc->size = comedi_samples_to_bytes(s, nsamples);
468 comedi_isadma_program(desc);
469 }
470 }
471
472 static void das16_interrupt(struct comedi_device *dev)
473 {
474 struct das16_private_struct *devpriv = dev->private;
475 struct comedi_subdevice *s = dev->read_subdev;
476 struct comedi_async *async = s->async;
477 struct comedi_cmd *cmd = &async->cmd;
478 struct comedi_isadma *dma = devpriv->dma;
479 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
480 unsigned long spin_flags;
481 unsigned int residue;
482 unsigned int nbytes;
483 unsigned int nsamples;
484
485 spin_lock_irqsave(&dev->spinlock, spin_flags);
486 if (!(devpriv->ctrl_reg & DAS16_CTRL_DMAE)) {
487 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
488 return;
489 }
490
491 /*
492 * The pc104-das16jr (at least) has problems if the dma
493 * transfer is interrupted in the middle of transferring
494 * a 16 bit sample.
495 */
496 residue = comedi_isadma_disable_on_sample(desc->chan,
497 comedi_bytes_per_sample(s));
498
499 /* figure out how many samples to read */
500 if (residue > desc->size) {
501 dev_err(dev->class_dev, "residue > transfer size!\n");
502 async->events |= COMEDI_CB_ERROR;
503 nbytes = 0;
504 } else {
505 nbytes = desc->size - residue;
506 }
507 nsamples = comedi_bytes_to_samples(s, nbytes);
508
509 /* restart DMA if more samples are needed */
510 if (nsamples) {
511 dma->cur_dma = 1 - dma->cur_dma;
512 das16_ai_setup_dma(dev, s, nsamples);
513 }
514
515 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
516
517 comedi_buf_write_samples(s, desc->virt_addr, nsamples);
518
519 if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg)
520 async->events |= COMEDI_CB_EOA;
521
522 comedi_handle_events(dev, s);
523 }
524
525 static void das16_timer_interrupt(unsigned long arg)
526 {
527 struct comedi_device *dev = (struct comedi_device *)arg;
528 struct das16_private_struct *devpriv = dev->private;
529 unsigned long flags;
530
531 das16_interrupt(dev);
532
533 spin_lock_irqsave(&dev->spinlock, flags);
534 if (devpriv->timer_running)
535 mod_timer(&devpriv->timer, jiffies + timer_period());
536 spin_unlock_irqrestore(&dev->spinlock, flags);
537 }
538
539 static void das16_ai_set_mux_range(struct comedi_device *dev,
540 unsigned int first_chan,
541 unsigned int last_chan,
542 unsigned int range)
543 {
544 const struct das16_board *board = dev->board_ptr;
545
546 /* set multiplexer */
547 outb(first_chan | (last_chan << 4), dev->iobase + DAS16_MUX_REG);
548
549 /* some boards do not have programmable gain */
550 if (board->ai_pg == das16_pg_none)
551 return;
552
553 /*
554 * Set gain (this is also burst rate register but according to
555 * computer boards manual, burst rate does nothing, even on
556 * keithley cards).
557 */
558 outb((das16_gainlists[board->ai_pg])[range],
559 dev->iobase + DAS16_GAIN_REG);
560 }
561
562 static int das16_ai_check_chanlist(struct comedi_device *dev,
563 struct comedi_subdevice *s,
564 struct comedi_cmd *cmd)
565 {
566 unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);
567 unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
568 int i;
569
570 for (i = 1; i < cmd->chanlist_len; i++) {
571 unsigned int chan = CR_CHAN(cmd->chanlist[i]);
572 unsigned int range = CR_RANGE(cmd->chanlist[i]);
573
574 if (chan != ((chan0 + i) % s->n_chan)) {
575 dev_dbg(dev->class_dev,
576 "entries in chanlist must be consecutive channels, counting upwards\n");
577 return -EINVAL;
578 }
579
580 if (range != range0) {
581 dev_dbg(dev->class_dev,
582 "entries in chanlist must all have the same gain\n");
583 return -EINVAL;
584 }
585 }
586
587 return 0;
588 }
589
590 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
591 struct comedi_cmd *cmd)
592 {
593 const struct das16_board *board = dev->board_ptr;
594 struct das16_private_struct *devpriv = dev->private;
595 int err = 0;
596 unsigned int trig_mask;
597 unsigned int arg;
598
599 /* Step 1 : check if triggers are trivially valid */
600
601 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
602
603 trig_mask = TRIG_FOLLOW;
604 if (devpriv->can_burst)
605 trig_mask |= TRIG_TIMER | TRIG_EXT;
606 err |= comedi_check_trigger_src(&cmd->scan_begin_src, trig_mask);
607
608 trig_mask = TRIG_TIMER | TRIG_EXT;
609 if (devpriv->can_burst)
610 trig_mask |= TRIG_NOW;
611 err |= comedi_check_trigger_src(&cmd->convert_src, trig_mask);
612
613 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
614 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
615
616 if (err)
617 return 1;
618
619 /* Step 2a : make sure trigger sources are unique */
620
621 err |= comedi_check_trigger_is_unique(cmd->scan_begin_src);
622 err |= comedi_check_trigger_is_unique(cmd->convert_src);
623 err |= comedi_check_trigger_is_unique(cmd->stop_src);
624
625 /* Step 2b : and mutually compatible */
626
627 /* make sure scan_begin_src and convert_src dont conflict */
628 if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
629 err |= -EINVAL;
630 if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW)
631 err |= -EINVAL;
632
633 if (err)
634 return 2;
635
636 /* Step 3: check if arguments are trivially valid */
637
638 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
639
640 if (cmd->scan_begin_src == TRIG_FOLLOW) /* internal trigger */
641 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
642
643 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
644 cmd->chanlist_len);
645
646 /* check against maximum frequency */
647 if (cmd->scan_begin_src == TRIG_TIMER) {
648 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
649 board->ai_speed *
650 cmd->chanlist_len);
651 }
652
653 if (cmd->convert_src == TRIG_TIMER) {
654 err |= comedi_check_trigger_arg_min(&cmd->convert_arg,
655 board->ai_speed);
656 }
657
658 if (cmd->stop_src == TRIG_COUNT)
659 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
660 else /* TRIG_NONE */
661 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
662
663 if (err)
664 return 3;
665
666 /* step 4: fix up arguments */
667 if (cmd->scan_begin_src == TRIG_TIMER) {
668 arg = cmd->scan_begin_arg;
669 comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
670 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
671 }
672 if (cmd->convert_src == TRIG_TIMER) {
673 arg = cmd->convert_arg;
674 comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
675 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
676 }
677 if (err)
678 return 4;
679
680 /* Step 5: check channel list if it exists */
681 if (cmd->chanlist && cmd->chanlist_len > 0)
682 err |= das16_ai_check_chanlist(dev, s, cmd);
683
684 if (err)
685 return 5;
686
687 return 0;
688 }
689
690 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
691 unsigned int flags)
692 {
693 comedi_8254_cascade_ns_to_timer(dev->pacer, &ns, flags);
694 comedi_8254_update_divisors(dev->pacer);
695 comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
696
697 return ns;
698 }
699
700 static int das16_cmd_exec(struct comedi_device *dev, struct comedi_subdevice *s)
701 {
702 struct das16_private_struct *devpriv = dev->private;
703 struct comedi_isadma *dma = devpriv->dma;
704 struct comedi_async *async = s->async;
705 struct comedi_cmd *cmd = &async->cmd;
706 unsigned int first_chan = CR_CHAN(cmd->chanlist[0]);
707 unsigned int last_chan = CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]);
708 unsigned int range = CR_RANGE(cmd->chanlist[0]);
709 unsigned int byte;
710 unsigned long flags;
711
712 if (cmd->flags & CMDF_PRIORITY) {
713 dev_err(dev->class_dev,
714 "isa dma transfers cannot be performed with CMDF_PRIORITY, aborting\n");
715 return -1;
716 }
717
718 if (devpriv->can_burst)
719 outb(DAS1600_CONV_DISABLE, dev->iobase + DAS1600_CONV_REG);
720
721 /* set mux and range for chanlist scan */
722 das16_ai_set_mux_range(dev, first_chan, last_chan, range);
723
724 /* set counter mode and counts */
725 cmd->convert_arg = das16_set_pacer(dev, cmd->convert_arg, cmd->flags);
726
727 /* enable counters */
728 byte = 0;
729 if (devpriv->can_burst) {
730 if (cmd->convert_src == TRIG_NOW) {
731 outb(DAS1600_BURST_VAL,
732 dev->iobase + DAS1600_BURST_REG);
733 /* set burst length */
734 byte |= DAS16_PACER_BURST_LEN(cmd->chanlist_len - 1);
735 } else {
736 outb(0, dev->iobase + DAS1600_BURST_REG);
737 }
738 }
739 outb(byte, dev->iobase + DAS16_PACER_REG);
740
741 /* set up dma transfer */
742 dma->cur_dma = 0;
743 das16_ai_setup_dma(dev, s, 0);
744
745 /* set up timer */
746 spin_lock_irqsave(&dev->spinlock, flags);
747 devpriv->timer_running = 1;
748 devpriv->timer.expires = jiffies + timer_period();
749 add_timer(&devpriv->timer);
750
751 /* enable DMA interrupt with external or internal pacing */
752 devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_PACING_MASK);
753 devpriv->ctrl_reg |= DAS16_CTRL_DMAE;
754 if (cmd->convert_src == TRIG_EXT)
755 devpriv->ctrl_reg |= DAS16_CTRL_EXT_PACER;
756 else
757 devpriv->ctrl_reg |= DAS16_CTRL_INT_PACER;
758 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
759
760 if (devpriv->can_burst)
761 outb(0, dev->iobase + DAS1600_CONV_REG);
762 spin_unlock_irqrestore(&dev->spinlock, flags);
763
764 return 0;
765 }
766
767 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
768 {
769 struct das16_private_struct *devpriv = dev->private;
770 struct comedi_isadma *dma = devpriv->dma;
771 unsigned long flags;
772
773 spin_lock_irqsave(&dev->spinlock, flags);
774
775 /* disable interrupts, dma and pacer clocked conversions */
776 devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_DMAE |
777 DAS16_CTRL_PACING_MASK);
778 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
779
780 comedi_isadma_disable(dma->chan);
781
782 /* disable SW timer */
783 if (devpriv->timer_running) {
784 devpriv->timer_running = 0;
785 del_timer(&devpriv->timer);
786 }
787
788 if (devpriv->can_burst)
789 outb(0, dev->iobase + DAS1600_BURST_REG);
790
791 spin_unlock_irqrestore(&dev->spinlock, flags);
792
793 return 0;
794 }
795
796 static void das16_ai_munge(struct comedi_device *dev,
797 struct comedi_subdevice *s, void *array,
798 unsigned int num_bytes,
799 unsigned int start_chan_index)
800 {
801 unsigned short *data = array;
802 unsigned int num_samples = comedi_bytes_to_samples(s, num_bytes);
803 unsigned int i;
804
805 for (i = 0; i < num_samples; i++) {
806 data[i] = le16_to_cpu(data[i]);
807 if (s->maxdata == 0x0fff)
808 data[i] >>= 4;
809 data[i] &= s->maxdata;
810 }
811 }
812
813 static int das16_ai_eoc(struct comedi_device *dev,
814 struct comedi_subdevice *s,
815 struct comedi_insn *insn,
816 unsigned long context)
817 {
818 unsigned int status;
819
820 status = inb(dev->iobase + DAS16_STATUS_REG);
821 if ((status & DAS16_STATUS_BUSY) == 0)
822 return 0;
823 return -EBUSY;
824 }
825
826 static int das16_ai_insn_read(struct comedi_device *dev,
827 struct comedi_subdevice *s,
828 struct comedi_insn *insn,
829 unsigned int *data)
830 {
831 unsigned int chan = CR_CHAN(insn->chanspec);
832 unsigned int range = CR_RANGE(insn->chanspec);
833 unsigned int val;
834 int ret;
835 int i;
836
837 /* set mux and range for single channel */
838 das16_ai_set_mux_range(dev, chan, chan, range);
839
840 for (i = 0; i < insn->n; i++) {
841 /* trigger conversion */
842 outb_p(0, dev->iobase + DAS16_TRIG_REG);
843
844 ret = comedi_timeout(dev, s, insn, das16_ai_eoc, 0);
845 if (ret)
846 return ret;
847
848 val = inb(dev->iobase + DAS16_AI_MSB_REG) << 8;
849 val |= inb(dev->iobase + DAS16_AI_LSB_REG);
850 if (s->maxdata == 0x0fff)
851 val >>= 4;
852 val &= s->maxdata;
853
854 data[i] = val;
855 }
856
857 return insn->n;
858 }
859
860 static int das16_ao_insn_write(struct comedi_device *dev,
861 struct comedi_subdevice *s,
862 struct comedi_insn *insn,
863 unsigned int *data)
864 {
865 unsigned int chan = CR_CHAN(insn->chanspec);
866 int i;
867
868 for (i = 0; i < insn->n; i++) {
869 unsigned int val = data[i];
870
871 s->readback[chan] = val;
872
873 val <<= 4;
874
875 outb(val & 0xff, dev->iobase + DAS16_AO_LSB_REG(chan));
876 outb((val >> 8) & 0xff, dev->iobase + DAS16_AO_MSB_REG(chan));
877 }
878
879 return insn->n;
880 }
881
882 static int das16_di_insn_bits(struct comedi_device *dev,
883 struct comedi_subdevice *s,
884 struct comedi_insn *insn,
885 unsigned int *data)
886 {
887 data[1] = inb(dev->iobase + DAS16_DIO_REG) & 0xf;
888
889 return insn->n;
890 }
891
892 static int das16_do_insn_bits(struct comedi_device *dev,
893 struct comedi_subdevice *s,
894 struct comedi_insn *insn,
895 unsigned int *data)
896 {
897 if (comedi_dio_update_state(s, data))
898 outb(s->state, dev->iobase + DAS16_DIO_REG);
899
900 data[1] = s->state;
901
902 return insn->n;
903 }
904
905 static int das16_probe(struct comedi_device *dev, struct comedi_devconfig *it)
906 {
907 const struct das16_board *board = dev->board_ptr;
908 int diobits;
909
910 /* diobits indicates boards */
911 diobits = inb(dev->iobase + DAS16_DIO_REG) & 0xf0;
912 if (board->id != diobits) {
913 dev_err(dev->class_dev,
914 "requested board's id bits are incorrect (0x%x != 0x%x)\n",
915 board->id, diobits);
916 return -EINVAL;
917 }
918
919 return 0;
920 }
921
922 static void das16_reset(struct comedi_device *dev)
923 {
924 outb(0, dev->iobase + DAS16_STATUS_REG);
925 outb(0, dev->iobase + DAS16_CTRL_REG);
926 outb(0, dev->iobase + DAS16_PACER_REG);
927 }
928
929 static void das16_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
930 {
931 struct das16_private_struct *devpriv = dev->private;
932
933 /* only DMA channels 3 and 1 are valid */
934 if (!(dma_chan == 1 || dma_chan == 3))
935 return;
936
937 /* DMA uses two buffers */
938 devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan, dma_chan,
939 DAS16_DMA_SIZE, COMEDI_ISADMA_READ);
940 if (devpriv->dma) {
941 setup_timer(&devpriv->timer, das16_timer_interrupt,
942 (unsigned long)dev);
943 }
944 }
945
946 static void das16_free_dma(struct comedi_device *dev)
947 {
948 struct das16_private_struct *devpriv = dev->private;
949
950 if (devpriv) {
951 if (devpriv->timer.data)
952 del_timer_sync(&devpriv->timer);
953 comedi_isadma_free(devpriv->dma);
954 }
955 }
956
957 static const struct comedi_lrange *das16_ai_range(struct comedi_device *dev,
958 struct comedi_subdevice *s,
959 struct comedi_devconfig *it,
960 unsigned int pg_type,
961 unsigned int status)
962 {
963 unsigned int min = it->options[4];
964 unsigned int max = it->options[5];
965
966 /* get any user-defined input range */
967 if (pg_type == das16_pg_none && (min || max)) {
968 struct comedi_lrange *lrange;
969 struct comedi_krange *krange;
970
971 /* allocate single-range range table */
972 lrange = comedi_alloc_spriv(s,
973 sizeof(*lrange) + sizeof(*krange));
974 if (!lrange)
975 return &range_unknown;
976
977 /* initialize ai range */
978 lrange->length = 1;
979 krange = lrange->range;
980 krange->min = min;
981 krange->max = max;
982 krange->flags = UNIT_volt;
983
984 return lrange;
985 }
986
987 /* use software programmable range */
988 if (status & DAS16_STATUS_UNIPOLAR)
989 return das16_ai_uni_lranges[pg_type];
990 return das16_ai_bip_lranges[pg_type];
991 }
992
993 static const struct comedi_lrange *das16_ao_range(struct comedi_device *dev,
994 struct comedi_subdevice *s,
995 struct comedi_devconfig *it)
996 {
997 unsigned int min = it->options[6];
998 unsigned int max = it->options[7];
999
1000 /* get any user-defined output range */
1001 if (min || max) {
1002 struct comedi_lrange *lrange;
1003 struct comedi_krange *krange;
1004
1005 /* allocate single-range range table */
1006 lrange = comedi_alloc_spriv(s,
1007 sizeof(*lrange) + sizeof(*krange));
1008 if (!lrange)
1009 return &range_unknown;
1010
1011 /* initialize ao range */
1012 lrange->length = 1;
1013 krange = lrange->range;
1014 krange->min = min;
1015 krange->max = max;
1016 krange->flags = UNIT_volt;
1017
1018 return lrange;
1019 }
1020
1021 return &range_unknown;
1022 }
1023
1024 static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1025 {
1026 const struct das16_board *board = dev->board_ptr;
1027 struct das16_private_struct *devpriv;
1028 struct comedi_subdevice *s;
1029 unsigned int osc_base;
1030 unsigned int status;
1031 int ret;
1032
1033 /* check that clock setting is valid */
1034 if (it->options[3]) {
1035 if (it->options[3] != 1 && it->options[3] != 10) {
1036 dev_err(dev->class_dev,
1037 "Invalid option. Master clock must be set to 1 or 10 (MHz)\n");
1038 return -EINVAL;
1039 }
1040 }
1041
1042 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
1043 if (!devpriv)
1044 return -ENOMEM;
1045
1046 if (board->size < 0x400) {
1047 ret = comedi_request_region(dev, it->options[0], board->size);
1048 if (ret)
1049 return ret;
1050 } else {
1051 ret = comedi_request_region(dev, it->options[0], 0x10);
1052 if (ret)
1053 return ret;
1054 /* Request an additional region for the 8255 */
1055 ret = __comedi_request_region(dev, dev->iobase + 0x400,
1056 board->size & 0x3ff);
1057 if (ret)
1058 return ret;
1059 devpriv->extra_iobase = dev->iobase + 0x400;
1060 devpriv->can_burst = 1;
1061 }
1062
1063 /* probe id bits to make sure they are consistent */
1064 if (das16_probe(dev, it))
1065 return -EINVAL;
1066
1067 /* get master clock speed */
1068 osc_base = I8254_OSC_BASE_1MHZ;
1069 if (devpriv->can_burst) {
1070 status = inb(dev->iobase + DAS1600_STATUS_REG);
1071 if (status & DAS1600_STATUS_CLK_10MHZ)
1072 osc_base = I8254_OSC_BASE_10MHZ;
1073 } else {
1074 if (it->options[3])
1075 osc_base = I8254_OSC_BASE_1MHZ / it->options[3];
1076 }
1077
1078 dev->pacer = comedi_8254_init(dev->iobase + DAS16_TIMER_BASE_REG,
1079 osc_base, I8254_IO8, 0);
1080 if (!dev->pacer)
1081 return -ENOMEM;
1082
1083 das16_alloc_dma(dev, it->options[2]);
1084
1085 ret = comedi_alloc_subdevices(dev, 4 + board->has_8255);
1086 if (ret)
1087 return ret;
1088
1089 status = inb(dev->iobase + DAS16_STATUS_REG);
1090
1091 /* Analog Input subdevice */
1092 s = &dev->subdevices[0];
1093 s->type = COMEDI_SUBD_AI;
1094 s->subdev_flags = SDF_READABLE;
1095 if (status & DAS16_STATUS_MUXBIT) {
1096 s->subdev_flags |= SDF_GROUND;
1097 s->n_chan = 16;
1098 } else {
1099 s->subdev_flags |= SDF_DIFF;
1100 s->n_chan = 8;
1101 }
1102 s->len_chanlist = s->n_chan;
1103 s->maxdata = board->ai_maxdata;
1104 s->range_table = das16_ai_range(dev, s, it, board->ai_pg, status);
1105 s->insn_read = das16_ai_insn_read;
1106 if (devpriv->dma) {
1107 dev->read_subdev = s;
1108 s->subdev_flags |= SDF_CMD_READ;
1109 s->do_cmdtest = das16_cmd_test;
1110 s->do_cmd = das16_cmd_exec;
1111 s->cancel = das16_cancel;
1112 s->munge = das16_ai_munge;
1113 }
1114
1115 /* Analog Output subdevice */
1116 s = &dev->subdevices[1];
1117 if (board->has_ao) {
1118 s->type = COMEDI_SUBD_AO;
1119 s->subdev_flags = SDF_WRITABLE;
1120 s->n_chan = 2;
1121 s->maxdata = 0x0fff;
1122 s->range_table = das16_ao_range(dev, s, it);
1123 s->insn_write = das16_ao_insn_write;
1124
1125 ret = comedi_alloc_subdev_readback(s);
1126 if (ret)
1127 return ret;
1128 } else {
1129 s->type = COMEDI_SUBD_UNUSED;
1130 }
1131
1132 /* Digital Input subdevice */
1133 s = &dev->subdevices[2];
1134 s->type = COMEDI_SUBD_DI;
1135 s->subdev_flags = SDF_READABLE;
1136 s->n_chan = 4;
1137 s->maxdata = 1;
1138 s->range_table = &range_digital;
1139 s->insn_bits = das16_di_insn_bits;
1140
1141 /* Digital Output subdevice */
1142 s = &dev->subdevices[3];
1143 s->type = COMEDI_SUBD_DO;
1144 s->subdev_flags = SDF_WRITABLE;
1145 s->n_chan = 4;
1146 s->maxdata = 1;
1147 s->range_table = &range_digital;
1148 s->insn_bits = das16_do_insn_bits;
1149
1150 /* initialize digital output lines */
1151 outb(s->state, dev->iobase + DAS16_DIO_REG);
1152
1153 /* 8255 Digital I/O subdevice */
1154 if (board->has_8255) {
1155 s = &dev->subdevices[4];
1156 ret = subdev_8255_init(dev, s, NULL, board->i8255_offset);
1157 if (ret)
1158 return ret;
1159 }
1160
1161 das16_reset(dev);
1162 /* set the interrupt level */
1163 devpriv->ctrl_reg = DAS16_CTRL_IRQ(dev->irq);
1164 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
1165
1166 if (devpriv->can_burst) {
1167 outb(DAS1600_ENABLE_VAL, dev->iobase + DAS1600_ENABLE_REG);
1168 outb(0, dev->iobase + DAS1600_CONV_REG);
1169 outb(0, dev->iobase + DAS1600_BURST_REG);
1170 }
1171
1172 return 0;
1173 }
1174
1175 static void das16_detach(struct comedi_device *dev)
1176 {
1177 const struct das16_board *board = dev->board_ptr;
1178 struct das16_private_struct *devpriv = dev->private;
1179
1180 if (devpriv) {
1181 if (dev->iobase)
1182 das16_reset(dev);
1183 das16_free_dma(dev);
1184
1185 if (devpriv->extra_iobase)
1186 release_region(devpriv->extra_iobase,
1187 board->size & 0x3ff);
1188 }
1189
1190 comedi_legacy_detach(dev);
1191 }
1192
1193 static struct comedi_driver das16_driver = {
1194 .driver_name = "das16",
1195 .module = THIS_MODULE,
1196 .attach = das16_attach,
1197 .detach = das16_detach,
1198 .board_name = &das16_boards[0].name,
1199 .num_names = ARRAY_SIZE(das16_boards),
1200 .offset = sizeof(das16_boards[0]),
1201 };
1202 module_comedi_driver(das16_driver);
1203
1204 MODULE_AUTHOR("Comedi http://www.comedi.org");
1205 MODULE_DESCRIPTION("Comedi driver for DAS16 compatible boards");
1206 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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