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staging: comedi: das16: introduce das16_ai_set_mux_range()
[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_ai_setup_dma(struct comedi_device *dev,
452 struct comedi_subdevice *s,
453 unsigned int unread_samples)
454 {
455 struct das16_private_struct *devpriv = dev->private;
456 struct comedi_isadma *dma = devpriv->dma;
457 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
458 unsigned int max_samples = comedi_bytes_to_samples(s, desc->maxsize);
459 unsigned int nsamples;
460
461 /*
462 * Determine dma size based on the buffer size plus the number of
463 * unread samples and the number of samples remaining in the command.
464 */
465 nsamples = comedi_nsamples_left(s, max_samples + unread_samples);
466 if (nsamples > unread_samples) {
467 nsamples -= unread_samples;
468 desc->size = comedi_samples_to_bytes(s, nsamples);
469 comedi_isadma_program(desc);
470 }
471 }
472
473 static void das16_interrupt(struct comedi_device *dev)
474 {
475 struct das16_private_struct *devpriv = dev->private;
476 struct comedi_subdevice *s = dev->read_subdev;
477 struct comedi_async *async = s->async;
478 struct comedi_cmd *cmd = &async->cmd;
479 struct comedi_isadma *dma = devpriv->dma;
480 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
481 unsigned long spin_flags;
482 unsigned int residue;
483 unsigned int nbytes;
484 unsigned int nsamples;
485
486 spin_lock_irqsave(&dev->spinlock, spin_flags);
487 if (!(devpriv->ctrl_reg & DAS16_CTRL_DMAE)) {
488 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
489 return;
490 }
491
492 /*
493 * The pc104-das16jr (at least) has problems if the dma
494 * transfer is interrupted in the middle of transferring
495 * a 16 bit sample.
496 */
497 residue = comedi_isadma_disable_on_sample(desc->chan,
498 comedi_bytes_per_sample(s));
499
500 /* figure out how many samples to read */
501 if (residue > desc->size) {
502 dev_err(dev->class_dev, "residue > transfer size!\n");
503 async->events |= COMEDI_CB_ERROR;
504 nbytes = 0;
505 } else {
506 nbytes = desc->size - residue;
507 }
508 nsamples = comedi_bytes_to_samples(s, nbytes);
509
510 /* restart DMA if more samples are needed */
511 if (nsamples) {
512 dma->cur_dma = 1 - dma->cur_dma;
513 das16_ai_setup_dma(dev, s, nsamples);
514 }
515
516 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
517
518 comedi_buf_write_samples(s, desc->virt_addr, nsamples);
519
520 if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg)
521 async->events |= COMEDI_CB_EOA;
522
523 comedi_handle_events(dev, s);
524 }
525
526 static void das16_timer_interrupt(unsigned long arg)
527 {
528 struct comedi_device *dev = (struct comedi_device *)arg;
529 struct das16_private_struct *devpriv = dev->private;
530 unsigned long flags;
531
532 das16_interrupt(dev);
533
534 spin_lock_irqsave(&dev->spinlock, flags);
535 if (devpriv->timer_running)
536 mod_timer(&devpriv->timer, jiffies + timer_period());
537 spin_unlock_irqrestore(&dev->spinlock, flags);
538 }
539
540 static void das16_ai_set_mux_range(struct comedi_device *dev,
541 unsigned int first_chan,
542 unsigned int last_chan,
543 unsigned int range)
544 {
545 const struct das16_board *board = dev->board_ptr;
546
547 /* set multiplexer */
548 outb(first_chan | (last_chan << 4), dev->iobase + DAS16_MUX_REG);
549
550 /* some boards do not have programmable gain */
551 if (board->ai_pg == das16_pg_none)
552 return;
553
554 /*
555 * Set gain (this is also burst rate register but according to
556 * computer boards manual, burst rate does nothing, even on
557 * keithley cards).
558 */
559 outb((das16_gainlists[board->ai_pg])[range],
560 dev->iobase + DAS16_GAIN_REG);
561 }
562
563 static int das16_ai_check_chanlist(struct comedi_device *dev,
564 struct comedi_subdevice *s,
565 struct comedi_cmd *cmd)
566 {
567 unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);
568 unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
569 int i;
570
571 for (i = 1; i < cmd->chanlist_len; i++) {
572 unsigned int chan = CR_CHAN(cmd->chanlist[i]);
573 unsigned int range = CR_RANGE(cmd->chanlist[i]);
574
575 if (chan != ((chan0 + i) % s->n_chan)) {
576 dev_dbg(dev->class_dev,
577 "entries in chanlist must be consecutive channels, counting upwards\n");
578 return -EINVAL;
579 }
580
581 if (range != range0) {
582 dev_dbg(dev->class_dev,
583 "entries in chanlist must all have the same gain\n");
584 return -EINVAL;
585 }
586 }
587
588 return 0;
589 }
590
591 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
592 struct comedi_cmd *cmd)
593 {
594 const struct das16_board *board = dev->board_ptr;
595 struct das16_private_struct *devpriv = dev->private;
596 int err = 0;
597 unsigned int trig_mask;
598 unsigned int arg;
599
600 /* Step 1 : check if triggers are trivially valid */
601
602 err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW);
603
604 trig_mask = TRIG_FOLLOW;
605 if (devpriv->can_burst)
606 trig_mask |= TRIG_TIMER | TRIG_EXT;
607 err |= cfc_check_trigger_src(&cmd->scan_begin_src, trig_mask);
608
609 trig_mask = TRIG_TIMER | TRIG_EXT;
610 if (devpriv->can_burst)
611 trig_mask |= TRIG_NOW;
612 err |= cfc_check_trigger_src(&cmd->convert_src, trig_mask);
613
614 err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
615 err |= cfc_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
616
617 if (err)
618 return 1;
619
620 /* Step 2a : make sure trigger sources are unique */
621
622 err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
623 err |= cfc_check_trigger_is_unique(cmd->convert_src);
624 err |= cfc_check_trigger_is_unique(cmd->stop_src);
625
626 /* Step 2b : and mutually compatible */
627
628 /* make sure scan_begin_src and convert_src dont conflict */
629 if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
630 err |= -EINVAL;
631 if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW)
632 err |= -EINVAL;
633
634 if (err)
635 return 2;
636
637 /* Step 3: check if arguments are trivially valid */
638
639 err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
640
641 if (cmd->scan_begin_src == TRIG_FOLLOW) /* internal trigger */
642 err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
643
644 err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
645
646 /* check against maximum frequency */
647 if (cmd->scan_begin_src == TRIG_TIMER)
648 err |= cfc_check_trigger_arg_min(&cmd->scan_begin_arg,
649 board->ai_speed * cmd->chanlist_len);
650
651 if (cmd->convert_src == TRIG_TIMER)
652 err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
653 board->ai_speed);
654
655 if (cmd->stop_src == TRIG_COUNT)
656 err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
657 else /* TRIG_NONE */
658 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
659
660 if (err)
661 return 3;
662
663 /* step 4: fix up arguments */
664 if (cmd->scan_begin_src == TRIG_TIMER) {
665 arg = cmd->scan_begin_arg;
666 i8253_cascade_ns_to_timer(devpriv->clockbase,
667 &devpriv->divisor1,
668 &devpriv->divisor2,
669 &arg, cmd->flags);
670 err |= cfc_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
671 }
672 if (cmd->convert_src == TRIG_TIMER) {
673 arg = cmd->convert_arg;
674 i8253_cascade_ns_to_timer(devpriv->clockbase,
675 &devpriv->divisor1,
676 &devpriv->divisor2,
677 &arg, cmd->flags);
678 err |= cfc_check_trigger_arg_is(&cmd->convert_arg, arg);
679 }
680 if (err)
681 return 4;
682
683 /* Step 5: check channel list if it exists */
684 if (cmd->chanlist && cmd->chanlist_len > 0)
685 err |= das16_ai_check_chanlist(dev, s, cmd);
686
687 if (err)
688 return 5;
689
690 return 0;
691 }
692
693 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
694 unsigned int flags)
695 {
696 struct das16_private_struct *devpriv = dev->private;
697 unsigned long timer_base = dev->iobase + DAS16_TIMER_BASE_REG;
698
699 i8253_cascade_ns_to_timer(devpriv->clockbase,
700 &devpriv->divisor1, &devpriv->divisor2,
701 &ns, flags);
702
703 i8254_set_mode(timer_base, 0, 1, I8254_MODE2 | I8254_BINARY);
704 i8254_set_mode(timer_base, 0, 2, I8254_MODE2 | I8254_BINARY);
705 i8254_write(timer_base, 0, 1, devpriv->divisor1);
706 i8254_write(timer_base, 0, 2, devpriv->divisor2);
707
708 return ns;
709 }
710
711 static int das16_cmd_exec(struct comedi_device *dev, struct comedi_subdevice *s)
712 {
713 struct das16_private_struct *devpriv = dev->private;
714 struct comedi_isadma *dma = devpriv->dma;
715 struct comedi_async *async = s->async;
716 struct comedi_cmd *cmd = &async->cmd;
717 unsigned int first_chan = CR_CHAN(cmd->chanlist[0]);
718 unsigned int last_chan = CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]);
719 unsigned int range = CR_RANGE(cmd->chanlist[0]);
720 unsigned int byte;
721 unsigned long flags;
722
723 if (cmd->flags & CMDF_PRIORITY) {
724 dev_err(dev->class_dev,
725 "isa dma transfers cannot be performed with CMDF_PRIORITY, aborting\n");
726 return -1;
727 }
728
729 if (devpriv->can_burst)
730 outb(DAS1600_CONV_DISABLE, dev->iobase + DAS1600_CONV_REG);
731
732 /* set mux and range for chanlist scan */
733 das16_ai_set_mux_range(dev, first_chan, last_chan, range);
734
735 /* set counter mode and counts */
736 cmd->convert_arg = das16_set_pacer(dev, cmd->convert_arg, cmd->flags);
737
738 /* enable counters */
739 byte = 0;
740 if (devpriv->can_burst) {
741 if (cmd->convert_src == TRIG_NOW) {
742 outb(DAS1600_BURST_VAL,
743 dev->iobase + DAS1600_BURST_REG);
744 /* set burst length */
745 byte |= DAS16_PACER_BURST_LEN(cmd->chanlist_len - 1);
746 } else {
747 outb(0, dev->iobase + DAS1600_BURST_REG);
748 }
749 }
750 outb(byte, dev->iobase + DAS16_PACER_REG);
751
752 /* set up dma transfer */
753 dma->cur_dma = 0;
754 das16_ai_setup_dma(dev, s, 0);
755
756 /* set up timer */
757 spin_lock_irqsave(&dev->spinlock, flags);
758 devpriv->timer_running = 1;
759 devpriv->timer.expires = jiffies + timer_period();
760 add_timer(&devpriv->timer);
761
762 /* enable DMA interrupt with external or internal pacing */
763 devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_PACING_MASK);
764 devpriv->ctrl_reg |= DAS16_CTRL_DMAE;
765 if (cmd->convert_src == TRIG_EXT)
766 devpriv->ctrl_reg |= DAS16_CTRL_EXT_PACER;
767 else
768 devpriv->ctrl_reg |= DAS16_CTRL_INT_PACER;
769 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
770
771 if (devpriv->can_burst)
772 outb(0, dev->iobase + DAS1600_CONV_REG);
773 spin_unlock_irqrestore(&dev->spinlock, flags);
774
775 return 0;
776 }
777
778 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
779 {
780 struct das16_private_struct *devpriv = dev->private;
781 struct comedi_isadma *dma = devpriv->dma;
782 unsigned long flags;
783
784 spin_lock_irqsave(&dev->spinlock, flags);
785
786 /* disable interrupts, dma and pacer clocked conversions */
787 devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_DMAE |
788 DAS16_CTRL_PACING_MASK);
789 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
790
791 comedi_isadma_disable(dma->chan);
792
793 /* disable SW timer */
794 if (devpriv->timer_running) {
795 devpriv->timer_running = 0;
796 del_timer(&devpriv->timer);
797 }
798
799 if (devpriv->can_burst)
800 outb(0, dev->iobase + DAS1600_BURST_REG);
801
802 spin_unlock_irqrestore(&dev->spinlock, flags);
803
804 return 0;
805 }
806
807 static void das16_ai_munge(struct comedi_device *dev,
808 struct comedi_subdevice *s, void *array,
809 unsigned int num_bytes,
810 unsigned int start_chan_index)
811 {
812 unsigned short *data = array;
813 unsigned int num_samples = comedi_bytes_to_samples(s, num_bytes);
814 unsigned int i;
815
816 for (i = 0; i < num_samples; i++) {
817 data[i] = le16_to_cpu(data[i]);
818 if (s->maxdata == 0x0fff)
819 data[i] >>= 4;
820 data[i] &= s->maxdata;
821 }
822 }
823
824 static int das16_ai_eoc(struct comedi_device *dev,
825 struct comedi_subdevice *s,
826 struct comedi_insn *insn,
827 unsigned long context)
828 {
829 unsigned int status;
830
831 status = inb(dev->iobase + DAS16_STATUS_REG);
832 if ((status & DAS16_STATUS_BUSY) == 0)
833 return 0;
834 return -EBUSY;
835 }
836
837 static int das16_ai_insn_read(struct comedi_device *dev,
838 struct comedi_subdevice *s,
839 struct comedi_insn *insn,
840 unsigned int *data)
841 {
842 unsigned int chan = CR_CHAN(insn->chanspec);
843 unsigned int range = CR_RANGE(insn->chanspec);
844 unsigned int val;
845 int ret;
846 int i;
847
848 /* set mux and range for single channel */
849 das16_ai_set_mux_range(dev, chan, chan, range);
850
851 for (i = 0; i < insn->n; i++) {
852 /* trigger conversion */
853 outb_p(0, dev->iobase + DAS16_TRIG_REG);
854
855 ret = comedi_timeout(dev, s, insn, das16_ai_eoc, 0);
856 if (ret)
857 return ret;
858
859 val = inb(dev->iobase + DAS16_AI_MSB_REG) << 8;
860 val |= inb(dev->iobase + DAS16_AI_LSB_REG);
861 if (s->maxdata == 0x0fff)
862 val >>= 4;
863 val &= s->maxdata;
864
865 data[i] = val;
866 }
867
868 return insn->n;
869 }
870
871 static int das16_ao_insn_write(struct comedi_device *dev,
872 struct comedi_subdevice *s,
873 struct comedi_insn *insn,
874 unsigned int *data)
875 {
876 unsigned int chan = CR_CHAN(insn->chanspec);
877 int i;
878
879 for (i = 0; i < insn->n; i++) {
880 unsigned int val = data[i];
881
882 s->readback[chan] = val;
883
884 val <<= 4;
885
886 outb(val & 0xff, dev->iobase + DAS16_AO_LSB_REG(chan));
887 outb((val >> 8) & 0xff, dev->iobase + DAS16_AO_MSB_REG(chan));
888 }
889
890 return insn->n;
891 }
892
893 static int das16_di_insn_bits(struct comedi_device *dev,
894 struct comedi_subdevice *s,
895 struct comedi_insn *insn,
896 unsigned int *data)
897 {
898 data[1] = inb(dev->iobase + DAS16_DIO_REG) & 0xf;
899
900 return insn->n;
901 }
902
903 static int das16_do_insn_bits(struct comedi_device *dev,
904 struct comedi_subdevice *s,
905 struct comedi_insn *insn,
906 unsigned int *data)
907 {
908 if (comedi_dio_update_state(s, data))
909 outb(s->state, dev->iobase + DAS16_DIO_REG);
910
911 data[1] = s->state;
912
913 return insn->n;
914 }
915
916 static int das16_probe(struct comedi_device *dev, struct comedi_devconfig *it)
917 {
918 const struct das16_board *board = dev->board_ptr;
919 int diobits;
920
921 /* diobits indicates boards */
922 diobits = inb(dev->iobase + DAS16_DIO_REG) & 0xf0;
923 if (board->id != diobits) {
924 dev_err(dev->class_dev,
925 "requested board's id bits are incorrect (0x%x != 0x%x)\n",
926 board->id, diobits);
927 return -EINVAL;
928 }
929
930 return 0;
931 }
932
933 static void das16_reset(struct comedi_device *dev)
934 {
935 outb(0, dev->iobase + DAS16_STATUS_REG);
936 outb(0, dev->iobase + DAS16_CTRL_REG);
937 outb(0, dev->iobase + DAS16_PACER_REG);
938 outb(0, dev->iobase + DAS16_TIMER_BASE_REG + i8254_control_reg);
939 }
940
941 static void das16_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
942 {
943 struct das16_private_struct *devpriv = dev->private;
944
945 /* only DMA channels 3 and 1 are valid */
946 if (!(dma_chan == 1 || dma_chan == 3))
947 return;
948
949 /* DMA uses two buffers */
950 devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan, dma_chan,
951 DAS16_DMA_SIZE, COMEDI_ISADMA_READ);
952 if (devpriv->dma) {
953 init_timer(&devpriv->timer);
954 devpriv->timer.function = das16_timer_interrupt;
955 devpriv->timer.data = (unsigned long)dev;
956 }
957 }
958
959 static void das16_free_dma(struct comedi_device *dev)
960 {
961 struct das16_private_struct *devpriv = dev->private;
962
963 if (devpriv) {
964 if (devpriv->timer.data)
965 del_timer_sync(&devpriv->timer);
966 comedi_isadma_free(devpriv->dma);
967 }
968 }
969
970 static const struct comedi_lrange *das16_ai_range(struct comedi_device *dev,
971 struct comedi_subdevice *s,
972 struct comedi_devconfig *it,
973 unsigned int pg_type,
974 unsigned int status)
975 {
976 unsigned int min = it->options[4];
977 unsigned int max = it->options[5];
978
979 /* get any user-defined input range */
980 if (pg_type == das16_pg_none && (min || max)) {
981 struct comedi_lrange *lrange;
982 struct comedi_krange *krange;
983
984 /* allocate single-range range table */
985 lrange = comedi_alloc_spriv(s,
986 sizeof(*lrange) + sizeof(*krange));
987 if (!lrange)
988 return &range_unknown;
989
990 /* initialize ai range */
991 lrange->length = 1;
992 krange = lrange->range;
993 krange->min = min;
994 krange->max = max;
995 krange->flags = UNIT_volt;
996
997 return lrange;
998 }
999
1000 /* use software programmable range */
1001 if (status & DAS16_STATUS_UNIPOLAR)
1002 return das16_ai_uni_lranges[pg_type];
1003 return das16_ai_bip_lranges[pg_type];
1004 }
1005
1006 static const struct comedi_lrange *das16_ao_range(struct comedi_device *dev,
1007 struct comedi_subdevice *s,
1008 struct comedi_devconfig *it)
1009 {
1010 unsigned int min = it->options[6];
1011 unsigned int max = it->options[7];
1012
1013 /* get any user-defined output range */
1014 if (min || max) {
1015 struct comedi_lrange *lrange;
1016 struct comedi_krange *krange;
1017
1018 /* allocate single-range range table */
1019 lrange = comedi_alloc_spriv(s,
1020 sizeof(*lrange) + sizeof(*krange));
1021 if (!lrange)
1022 return &range_unknown;
1023
1024 /* initialize ao range */
1025 lrange->length = 1;
1026 krange = lrange->range;
1027 krange->min = min;
1028 krange->max = max;
1029 krange->flags = UNIT_volt;
1030
1031 return lrange;
1032 }
1033
1034 return &range_unknown;
1035 }
1036
1037 static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it)
1038 {
1039 const struct das16_board *board = dev->board_ptr;
1040 struct das16_private_struct *devpriv;
1041 struct comedi_subdevice *s;
1042 unsigned int status;
1043 int ret;
1044
1045 /* check that clock setting is valid */
1046 if (it->options[3]) {
1047 if (it->options[3] != 0 &&
1048 it->options[3] != 1 && it->options[3] != 10) {
1049 dev_err(dev->class_dev,
1050 "Invalid option. Master clock must be set to 1 or 10 (MHz)\n");
1051 return -EINVAL;
1052 }
1053 }
1054
1055 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
1056 if (!devpriv)
1057 return -ENOMEM;
1058
1059 if (board->size < 0x400) {
1060 ret = comedi_request_region(dev, it->options[0], board->size);
1061 if (ret)
1062 return ret;
1063 } else {
1064 ret = comedi_request_region(dev, it->options[0], 0x10);
1065 if (ret)
1066 return ret;
1067 /* Request an additional region for the 8255 */
1068 ret = __comedi_request_region(dev, dev->iobase + 0x400,
1069 board->size & 0x3ff);
1070 if (ret)
1071 return ret;
1072 devpriv->extra_iobase = dev->iobase + 0x400;
1073 devpriv->can_burst = 1;
1074 }
1075
1076 /* probe id bits to make sure they are consistent */
1077 if (das16_probe(dev, it))
1078 return -EINVAL;
1079
1080 /* get master clock speed */
1081 if (devpriv->can_burst) {
1082 status = inb(dev->iobase + DAS1600_STATUS_REG);
1083
1084 if (status & DAS1600_STATUS_CLK_10MHZ)
1085 devpriv->clockbase = I8254_OSC_BASE_10MHZ;
1086 else
1087 devpriv->clockbase = I8254_OSC_BASE_1MHZ;
1088 } else {
1089 if (it->options[3])
1090 devpriv->clockbase = I8254_OSC_BASE_1MHZ /
1091 it->options[3];
1092 else
1093 devpriv->clockbase = I8254_OSC_BASE_1MHZ;
1094 }
1095
1096 das16_alloc_dma(dev, it->options[2]);
1097
1098 ret = comedi_alloc_subdevices(dev, 4 + board->has_8255);
1099 if (ret)
1100 return ret;
1101
1102 status = inb(dev->iobase + DAS16_STATUS_REG);
1103
1104 /* Analog Input subdevice */
1105 s = &dev->subdevices[0];
1106 s->type = COMEDI_SUBD_AI;
1107 s->subdev_flags = SDF_READABLE;
1108 if (status & DAS16_STATUS_MUXBIT) {
1109 s->subdev_flags |= SDF_GROUND;
1110 s->n_chan = 16;
1111 } else {
1112 s->subdev_flags |= SDF_DIFF;
1113 s->n_chan = 8;
1114 }
1115 s->len_chanlist = s->n_chan;
1116 s->maxdata = board->ai_maxdata;
1117 s->range_table = das16_ai_range(dev, s, it, board->ai_pg, status);
1118 s->insn_read = das16_ai_insn_read;
1119 if (devpriv->dma) {
1120 dev->read_subdev = s;
1121 s->subdev_flags |= SDF_CMD_READ;
1122 s->do_cmdtest = das16_cmd_test;
1123 s->do_cmd = das16_cmd_exec;
1124 s->cancel = das16_cancel;
1125 s->munge = das16_ai_munge;
1126 }
1127
1128 /* Analog Output subdevice */
1129 s = &dev->subdevices[1];
1130 if (board->has_ao) {
1131 s->type = COMEDI_SUBD_AO;
1132 s->subdev_flags = SDF_WRITABLE;
1133 s->n_chan = 2;
1134 s->maxdata = 0x0fff;
1135 s->range_table = das16_ao_range(dev, s, it);
1136 s->insn_write = das16_ao_insn_write;
1137
1138 ret = comedi_alloc_subdev_readback(s);
1139 if (ret)
1140 return ret;
1141 } else {
1142 s->type = COMEDI_SUBD_UNUSED;
1143 }
1144
1145 /* Digital Input subdevice */
1146 s = &dev->subdevices[2];
1147 s->type = COMEDI_SUBD_DI;
1148 s->subdev_flags = SDF_READABLE;
1149 s->n_chan = 4;
1150 s->maxdata = 1;
1151 s->range_table = &range_digital;
1152 s->insn_bits = das16_di_insn_bits;
1153
1154 /* Digital Output subdevice */
1155 s = &dev->subdevices[3];
1156 s->type = COMEDI_SUBD_DO;
1157 s->subdev_flags = SDF_WRITABLE;
1158 s->n_chan = 4;
1159 s->maxdata = 1;
1160 s->range_table = &range_digital;
1161 s->insn_bits = das16_do_insn_bits;
1162
1163 /* initialize digital output lines */
1164 outb(s->state, dev->iobase + DAS16_DIO_REG);
1165
1166 /* 8255 Digital I/O subdevice */
1167 if (board->has_8255) {
1168 s = &dev->subdevices[4];
1169 ret = subdev_8255_init(dev, s, NULL, board->i8255_offset);
1170 if (ret)
1171 return ret;
1172 }
1173
1174 das16_reset(dev);
1175 /* set the interrupt level */
1176 devpriv->ctrl_reg = DAS16_CTRL_IRQ(dev->irq);
1177 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
1178
1179 if (devpriv->can_burst) {
1180 outb(DAS1600_ENABLE_VAL, dev->iobase + DAS1600_ENABLE_REG);
1181 outb(0, dev->iobase + DAS1600_CONV_REG);
1182 outb(0, dev->iobase + DAS1600_BURST_REG);
1183 }
1184
1185 return 0;
1186 }
1187
1188 static void das16_detach(struct comedi_device *dev)
1189 {
1190 const struct das16_board *board = dev->board_ptr;
1191 struct das16_private_struct *devpriv = dev->private;
1192
1193 if (devpriv) {
1194 if (dev->iobase)
1195 das16_reset(dev);
1196 das16_free_dma(dev);
1197
1198 if (devpriv->extra_iobase)
1199 release_region(devpriv->extra_iobase,
1200 board->size & 0x3ff);
1201 }
1202
1203 comedi_legacy_detach(dev);
1204 }
1205
1206 static struct comedi_driver das16_driver = {
1207 .driver_name = "das16",
1208 .module = THIS_MODULE,
1209 .attach = das16_attach,
1210 .detach = das16_detach,
1211 .board_name = &das16_boards[0].name,
1212 .num_names = ARRAY_SIZE(das16_boards),
1213 .offset = sizeof(das16_boards[0]),
1214 };
1215 module_comedi_driver(das16_driver);
1216
1217 MODULE_AUTHOR("Comedi http://www.comedi.org");
1218 MODULE_DESCRIPTION("Comedi driver for DAS16 compatible boards");
1219 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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