1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * das16.c
4 * DAS16 driver
5 *
6 * COMEDI - Linux Control and Measurement Device Interface
7 * Copyright (C) 2000 David A. Schleef <ds@schleef.org>
8 * Copyright (C) 2000 Chris R. Baugher <baugher@enteract.com>
9 * Copyright (C) 2001,2002 Frank Mori Hess <fmhess@users.sourceforge.net>
10 */
11
12 /*
13 * Driver: das16
14 * Description: DAS16 compatible boards
15 * Author: Sam Moore, Warren Jasper, ds, Chris Baugher, Frank Hess, Roman Fietze
16 * Devices: [Keithley Metrabyte] DAS-16 (das-16), DAS-16G (das-16g),
17 * DAS-16F (das-16f), DAS-1201 (das-1201), DAS-1202 (das-1202),
18 * DAS-1401 (das-1401), DAS-1402 (das-1402), DAS-1601 (das-1601),
19 * DAS-1602 (das-1602),
20 * [ComputerBoards] PC104-DAS16/JR (pc104-das16jr),
21 * PC104-DAS16JR/16 (pc104-das16jr/16), CIO-DAS16 (cio-das16),
22 * CIO-DAS16F (cio-das16/f), CIO-DAS16/JR (cio-das16/jr),
23 * CIO-DAS16JR/16 (cio-das16jr/16), CIO-DAS1401/12 (cio-das1401/12),
24 * CIO-DAS1402/12 (cio-das1402/12), CIO-DAS1402/16 (cio-das1402/16),
25 * CIO-DAS1601/12 (cio-das1601/12), CIO-DAS1602/12 (cio-das1602/12),
26 * CIO-DAS1602/16 (cio-das1602/16), CIO-DAS16/330 (cio-das16/330)
27 * Status: works
28 * Updated: 2003-10-12
29 *
30 * A rewrite of the das16 and das1600 drivers.
31 *
32 * Options:
33 * [0] - base io address
34 * [1] - irq (does nothing, irq is not used anymore)
35 * [2] - dma channel (optional, required for comedi_command support)
36 * [3] - master clock speed in MHz (optional, 1 or 10, ignored if
37 * board can probe clock, defaults to 1)
38 * [4] - analog input range lowest voltage in microvolts (optional,
39 * only useful if your board does not have software
40 * programmable gain)
41 * [5] - analog input range highest voltage in microvolts (optional,
42 * only useful if board does not have software programmable
43 * gain)
44 * [6] - analog output range lowest voltage in microvolts (optional)
45 * [7] - analog output range highest voltage in microvolts (optional)
46 *
47 * Passing a zero for an option is the same as leaving it unspecified.
48 */
49
50 /*
51 * Testing and debugging help provided by Daniel Koch.
52 *
53 * Keithley Manuals:
54 * 2309.PDF (das16)
55 * 4919.PDF (das1400, 1600)
56 * 4922.PDF (das-1400)
57 * 4923.PDF (das1200, 1400, 1600)
58 *
59 * Computer boards manuals also available from their website
60 * www.measurementcomputing.com
61 */
62
63 #include <linux/module.h>
64 #include <linux/slab.h>
65 #include <linux/interrupt.h>
66 #include <linux/comedi/comedidev.h>
67 #include <linux/comedi/comedi_8255.h>
68 #include <linux/comedi/comedi_8254.h>
69 #include <linux/comedi/comedi_isadma.h>
70
71 #define DAS16_DMA_SIZE 0xff00 /* size in bytes of allocated dma buffer */
72
73 /*
74 * Register I/O map
75 */
76 #define DAS16_TRIG_REG 0x00
77 #define DAS16_AI_LSB_REG 0x00
78 #define DAS16_AI_MSB_REG 0x01
79 #define DAS16_MUX_REG 0x02
80 #define DAS16_DIO_REG 0x03
81 #define DAS16_AO_LSB_REG(x) ((x) ? 0x06 : 0x04)
82 #define DAS16_AO_MSB_REG(x) ((x) ? 0x07 : 0x05)
83 #define DAS16_STATUS_REG 0x08
84 #define DAS16_STATUS_BUSY BIT(7)
85 #define DAS16_STATUS_UNIPOLAR BIT(6)
86 #define DAS16_STATUS_MUXBIT BIT(5)
87 #define DAS16_STATUS_INT BIT(4)
88 #define DAS16_CTRL_REG 0x09
89 #define DAS16_CTRL_INTE BIT(7)
90 #define DAS16_CTRL_IRQ(x) (((x) & 0x7) << 4)
91 #define DAS16_CTRL_DMAE BIT(2)
92 #define DAS16_CTRL_PACING_MASK (3 << 0)
93 #define DAS16_CTRL_INT_PACER (3 << 0)
94 #define DAS16_CTRL_EXT_PACER (2 << 0)
95 #define DAS16_CTRL_SOFT_PACER (0 << 0)
96 #define DAS16_PACER_REG 0x0a
97 #define DAS16_PACER_BURST_LEN(x) (((x) & 0xf) << 4)
98 #define DAS16_PACER_CTR0 BIT(1)
99 #define DAS16_PACER_TRIG0 BIT(0)
100 #define DAS16_GAIN_REG 0x0b
101 #define DAS16_TIMER_BASE_REG 0x0c /* to 0x0f */
102
103 #define DAS1600_CONV_REG 0x404
104 #define DAS1600_CONV_DISABLE BIT(6)
105 #define DAS1600_BURST_REG 0x405
106 #define DAS1600_BURST_VAL BIT(6)
107 #define DAS1600_ENABLE_REG 0x406
108 #define DAS1600_ENABLE_VAL BIT(6)
109 #define DAS1600_STATUS_REG 0x407
110 #define DAS1600_STATUS_BME BIT(6)
111 #define DAS1600_STATUS_ME BIT(5)
112 #define DAS1600_STATUS_CD BIT(4)
113 #define DAS1600_STATUS_WS BIT(1)
114 #define DAS1600_STATUS_CLK_10MHZ BIT(0)
115
116 static const struct comedi_lrange range_das1x01_bip = {
117 4, {
118 BIP_RANGE(10),
119 BIP_RANGE(1),
120 BIP_RANGE(0.1),
121 BIP_RANGE(0.01)
122 }
123 };
124
125 static const struct comedi_lrange range_das1x01_unip = {
126 4, {
127 UNI_RANGE(10),
128 UNI_RANGE(1),
129 UNI_RANGE(0.1),
130 UNI_RANGE(0.01)
131 }
132 };
133
134 static const struct comedi_lrange range_das1x02_bip = {
135 4, {
136 BIP_RANGE(10),
137 BIP_RANGE(5),
138 BIP_RANGE(2.5),
139 BIP_RANGE(1.25)
140 }
141 };
142
143 static const struct comedi_lrange range_das1x02_unip = {
144 4, {
145 UNI_RANGE(10),
146 UNI_RANGE(5),
147 UNI_RANGE(2.5),
148 UNI_RANGE(1.25)
149 }
150 };
151
152 static const struct comedi_lrange range_das16jr = {
153 9, {
154 BIP_RANGE(10),
155 BIP_RANGE(5),
156 BIP_RANGE(2.5),
157 BIP_RANGE(1.25),
158 BIP_RANGE(0.625),
159 UNI_RANGE(10),
160 UNI_RANGE(5),
161 UNI_RANGE(2.5),
162 UNI_RANGE(1.25)
163 }
164 };
165
166 static const struct comedi_lrange range_das16jr_16 = {
167 8, {
168 BIP_RANGE(10),
169 BIP_RANGE(5),
170 BIP_RANGE(2.5),
171 BIP_RANGE(1.25),
172 UNI_RANGE(10),
173 UNI_RANGE(5),
174 UNI_RANGE(2.5),
175 UNI_RANGE(1.25)
176 }
177 };
178
179 static const int das16jr_gainlist[] = { 8, 0, 1, 2, 3, 4, 5, 6, 7 };
180 static const int das16jr_16_gainlist[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
181 static const int das1600_gainlist[] = { 0, 1, 2, 3 };
182
183 enum {
184 das16_pg_none = 0,
185 das16_pg_16jr,
186 das16_pg_16jr_16,
187 das16_pg_1601,
188 das16_pg_1602,
189 };
190
191 static const int *const das16_gainlists[] = {
192 NULL,
193 das16jr_gainlist,
194 das16jr_16_gainlist,
195 das1600_gainlist,
196 das1600_gainlist,
197 };
198
199 static const struct comedi_lrange *const das16_ai_uni_lranges[] = {
200 &range_unknown,
201 &range_das16jr,
202 &range_das16jr_16,
203 &range_das1x01_unip,
204 &range_das1x02_unip,
205 };
206
207 static const struct comedi_lrange *const das16_ai_bip_lranges[] = {
208 &range_unknown,
209 &range_das16jr,
210 &range_das16jr_16,
211 &range_das1x01_bip,
212 &range_das1x02_bip,
213 };
214
215 struct das16_board {
216 const char *name;
217 unsigned int ai_maxdata;
218 unsigned int ai_speed; /* max conversion speed in nanosec */
219 unsigned int ai_pg;
220 unsigned int has_ao:1;
221 unsigned int has_8255:1;
222
223 unsigned int i8255_offset;
224
225 unsigned int size;
226 unsigned int id;
227 };
228
229 static const struct das16_board das16_boards[] = {
230 {
231 .name = "das-16",
232 .ai_maxdata = 0x0fff,
233 .ai_speed = 15000,
234 .ai_pg = das16_pg_none,
235 .has_ao = 1,
236 .has_8255 = 1,
237 .i8255_offset = 0x10,
238 .size = 0x14,
239 .id = 0x00,
240 }, {
241 .name = "das-16g",
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-16f",
252 .ai_maxdata = 0x0fff,
253 .ai_speed = 8500,
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 = "cio-das16",
262 .ai_maxdata = 0x0fff,
263 .ai_speed = 20000,
264 .ai_pg = das16_pg_none,
265 .has_ao = 1,
266 .has_8255 = 1,
267 .i8255_offset = 0x10,
268 .size = 0x14,
269 .id = 0x80,
270 }, {
271 .name = "cio-das16/f",
272 .ai_maxdata = 0x0fff,
273 .ai_speed = 10000,
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/jr",
282 .ai_maxdata = 0x0fff,
283 .ai_speed = 7692,
284 .ai_pg = das16_pg_16jr,
285 .size = 0x10,
286 .id = 0x00,
287 }, {
288 .name = "pc104-das16jr",
289 .ai_maxdata = 0x0fff,
290 .ai_speed = 3300,
291 .ai_pg = das16_pg_16jr,
292 .size = 0x10,
293 .id = 0x00,
294 }, {
295 .name = "cio-das16jr/16",
296 .ai_maxdata = 0xffff,
297 .ai_speed = 10000,
298 .ai_pg = das16_pg_16jr_16,
299 .size = 0x10,
300 .id = 0x00,
301 }, {
302 .name = "pc104-das16jr/16",
303 .ai_maxdata = 0xffff,
304 .ai_speed = 10000,
305 .ai_pg = das16_pg_16jr_16,
306 .size = 0x10,
307 .id = 0x00,
308 }, {
309 .name = "das-1201",
310 .ai_maxdata = 0x0fff,
311 .ai_speed = 20000,
312 .ai_pg = das16_pg_none,
313 .has_8255 = 1,
314 .i8255_offset = 0x400,
315 .size = 0x408,
316 .id = 0x20,
317 }, {
318 .name = "das-1202",
319 .ai_maxdata = 0x0fff,
320 .ai_speed = 10000,
321 .ai_pg = das16_pg_none,
322 .has_8255 = 1,
323 .i8255_offset = 0x400,
324 .size = 0x408,
325 .id = 0x20,
326 }, {
327 .name = "das-1401",
328 .ai_maxdata = 0x0fff,
329 .ai_speed = 10000,
330 .ai_pg = das16_pg_1601,
331 .size = 0x408,
332 .id = 0xc0,
333 }, {
334 .name = "das-1402",
335 .ai_maxdata = 0x0fff,
336 .ai_speed = 10000,
337 .ai_pg = das16_pg_1602,
338 .size = 0x408,
339 .id = 0xc0,
340 }, {
341 .name = "das-1601",
342 .ai_maxdata = 0x0fff,
343 .ai_speed = 10000,
344 .ai_pg = das16_pg_1601,
345 .has_ao = 1,
346 .has_8255 = 1,
347 .i8255_offset = 0x400,
348 .size = 0x408,
349 .id = 0xc0,
350 }, {
351 .name = "das-1602",
352 .ai_maxdata = 0x0fff,
353 .ai_speed = 10000,
354 .ai_pg = das16_pg_1602,
355 .has_ao = 1,
356 .has_8255 = 1,
357 .i8255_offset = 0x400,
358 .size = 0x408,
359 .id = 0xc0,
360 }, {
361 .name = "cio-das1401/12",
362 .ai_maxdata = 0x0fff,
363 .ai_speed = 6250,
364 .ai_pg = das16_pg_1601,
365 .size = 0x408,
366 .id = 0xc0,
367 }, {
368 .name = "cio-das1402/12",
369 .ai_maxdata = 0x0fff,
370 .ai_speed = 6250,
371 .ai_pg = das16_pg_1602,
372 .size = 0x408,
373 .id = 0xc0,
374 }, {
375 .name = "cio-das1402/16",
376 .ai_maxdata = 0xffff,
377 .ai_speed = 10000,
378 .ai_pg = das16_pg_1602,
379 .size = 0x408,
380 .id = 0xc0,
381 }, {
382 .name = "cio-das1601/12",
383 .ai_maxdata = 0x0fff,
384 .ai_speed = 6250,
385 .ai_pg = das16_pg_1601,
386 .has_ao = 1,
387 .has_8255 = 1,
388 .i8255_offset = 0x400,
389 .size = 0x408,
390 .id = 0xc0,
391 }, {
392 .name = "cio-das1602/12",
393 .ai_maxdata = 0x0fff,
394 .ai_speed = 10000,
395 .ai_pg = das16_pg_1602,
396 .has_ao = 1,
397 .has_8255 = 1,
398 .i8255_offset = 0x400,
399 .size = 0x408,
400 .id = 0xc0,
401 }, {
402 .name = "cio-das1602/16",
403 .ai_maxdata = 0xffff,
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-das16/330",
413 .ai_maxdata = 0x0fff,
414 .ai_speed = 3030,
415 .ai_pg = das16_pg_16jr,
416 .size = 0x14,
417 .id = 0xf0,
418 },
419 };
420
421 /*
422 * Period for timer interrupt in jiffies. It's a function
423 * to deal with possibility of dynamic HZ patches
424 */
timer_period(void)425 static inline int timer_period(void)
426 {
427 return HZ / 20;
428 }
429
430 struct das16_private_struct {
431 struct comedi_isadma *dma;
432 struct comedi_device *dev;
433 unsigned int clockbase;
434 unsigned int ctrl_reg;
435 unsigned int divisor1;
436 unsigned int divisor2;
437 struct timer_list timer;
438 unsigned long extra_iobase;
439 unsigned int can_burst:1;
440 unsigned int timer_running:1;
441 };
442
das16_ai_setup_dma(struct comedi_device * dev,struct comedi_subdevice * s,unsigned int unread_samples)443 static void das16_ai_setup_dma(struct comedi_device *dev,
444 struct comedi_subdevice *s,
445 unsigned int unread_samples)
446 {
447 struct das16_private_struct *devpriv = dev->private;
448 struct comedi_isadma *dma = devpriv->dma;
449 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
450 unsigned int max_samples = comedi_bytes_to_samples(s, desc->maxsize);
451 unsigned int nsamples;
452
453 /*
454 * Determine dma size based on the buffer size plus the number of
455 * unread samples and the number of samples remaining in the command.
456 */
457 nsamples = comedi_nsamples_left(s, max_samples + unread_samples);
458 if (nsamples > unread_samples) {
459 nsamples -= unread_samples;
460 desc->size = comedi_samples_to_bytes(s, nsamples);
461 comedi_isadma_program(desc);
462 }
463 }
464
das16_interrupt(struct comedi_device * dev)465 static void das16_interrupt(struct comedi_device *dev)
466 {
467 struct das16_private_struct *devpriv = dev->private;
468 struct comedi_subdevice *s = dev->read_subdev;
469 struct comedi_async *async = s->async;
470 struct comedi_cmd *cmd = &async->cmd;
471 struct comedi_isadma *dma = devpriv->dma;
472 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma];
473 unsigned long spin_flags;
474 unsigned int residue;
475 unsigned int nbytes;
476 unsigned int nsamples;
477
478 spin_lock_irqsave(&dev->spinlock, spin_flags);
479 if (!(devpriv->ctrl_reg & DAS16_CTRL_DMAE)) {
480 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
481 return;
482 }
483
484 /*
485 * The pc104-das16jr (at least) has problems if the dma
486 * transfer is interrupted in the middle of transferring
487 * a 16 bit sample.
488 */
489 residue = comedi_isadma_disable_on_sample(desc->chan,
490 comedi_bytes_per_sample(s));
491
492 /* figure out how many samples to read */
493 if (residue > desc->size) {
494 dev_err(dev->class_dev, "residue > transfer size!\n");
495 async->events |= COMEDI_CB_ERROR;
496 nbytes = 0;
497 } else {
498 nbytes = desc->size - residue;
499 }
500 nsamples = comedi_bytes_to_samples(s, nbytes);
501
502 /* restart DMA if more samples are needed */
503 if (nsamples) {
504 dma->cur_dma = 1 - dma->cur_dma;
505 das16_ai_setup_dma(dev, s, nsamples);
506 }
507
508 spin_unlock_irqrestore(&dev->spinlock, spin_flags);
509
510 comedi_buf_write_samples(s, desc->virt_addr, nsamples);
511
512 if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg)
513 async->events |= COMEDI_CB_EOA;
514
515 comedi_handle_events(dev, s);
516 }
517
das16_timer_interrupt(struct timer_list * t)518 static void das16_timer_interrupt(struct timer_list *t)
519 {
520 struct das16_private_struct *devpriv = from_timer(devpriv, t, timer);
521 struct comedi_device *dev = devpriv->dev;
522 unsigned long flags;
523
524 das16_interrupt(dev);
525
526 spin_lock_irqsave(&dev->spinlock, flags);
527 if (devpriv->timer_running)
528 mod_timer(&devpriv->timer, jiffies + timer_period());
529 spin_unlock_irqrestore(&dev->spinlock, flags);
530 }
531
das16_ai_set_mux_range(struct comedi_device * dev,unsigned int first_chan,unsigned int last_chan,unsigned int range)532 static void das16_ai_set_mux_range(struct comedi_device *dev,
533 unsigned int first_chan,
534 unsigned int last_chan,
535 unsigned int range)
536 {
537 const struct das16_board *board = dev->board_ptr;
538
539 /* set multiplexer */
540 outb(first_chan | (last_chan << 4), dev->iobase + DAS16_MUX_REG);
541
542 /* some boards do not have programmable gain */
543 if (board->ai_pg == das16_pg_none)
544 return;
545
546 /*
547 * Set gain (this is also burst rate register but according to
548 * computer boards manual, burst rate does nothing, even on
549 * keithley cards).
550 */
551 outb((das16_gainlists[board->ai_pg])[range],
552 dev->iobase + DAS16_GAIN_REG);
553 }
554
das16_ai_check_chanlist(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_cmd * cmd)555 static int das16_ai_check_chanlist(struct comedi_device *dev,
556 struct comedi_subdevice *s,
557 struct comedi_cmd *cmd)
558 {
559 unsigned int chan0 = CR_CHAN(cmd->chanlist[0]);
560 unsigned int range0 = CR_RANGE(cmd->chanlist[0]);
561 int i;
562
563 for (i = 1; i < cmd->chanlist_len; i++) {
564 unsigned int chan = CR_CHAN(cmd->chanlist[i]);
565 unsigned int range = CR_RANGE(cmd->chanlist[i]);
566
567 if (chan != ((chan0 + i) % s->n_chan)) {
568 dev_dbg(dev->class_dev,
569 "entries in chanlist must be consecutive channels, counting upwards\n");
570 return -EINVAL;
571 }
572
573 if (range != range0) {
574 dev_dbg(dev->class_dev,
575 "entries in chanlist must all have the same gain\n");
576 return -EINVAL;
577 }
578 }
579
580 return 0;
581 }
582
das16_cmd_test(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_cmd * cmd)583 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s,
584 struct comedi_cmd *cmd)
585 {
586 const struct das16_board *board = dev->board_ptr;
587 struct das16_private_struct *devpriv = dev->private;
588 int err = 0;
589 unsigned int trig_mask;
590 unsigned int arg;
591
592 /* Step 1 : check if triggers are trivially valid */
593
594 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW);
595
596 trig_mask = TRIG_FOLLOW;
597 if (devpriv->can_burst)
598 trig_mask |= TRIG_TIMER | TRIG_EXT;
599 err |= comedi_check_trigger_src(&cmd->scan_begin_src, trig_mask);
600
601 trig_mask = TRIG_TIMER | TRIG_EXT;
602 if (devpriv->can_burst)
603 trig_mask |= TRIG_NOW;
604 err |= comedi_check_trigger_src(&cmd->convert_src, trig_mask);
605
606 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
607 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE);
608
609 if (err)
610 return 1;
611
612 /* Step 2a : make sure trigger sources are unique */
613
614 err |= comedi_check_trigger_is_unique(cmd->scan_begin_src);
615 err |= comedi_check_trigger_is_unique(cmd->convert_src);
616 err |= comedi_check_trigger_is_unique(cmd->stop_src);
617
618 /* Step 2b : and mutually compatible */
619
620 /* make sure scan_begin_src and convert_src don't conflict */
621 if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW)
622 err |= -EINVAL;
623 if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW)
624 err |= -EINVAL;
625
626 if (err)
627 return 2;
628
629 /* Step 3: check if arguments are trivially valid */
630
631 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0);
632
633 if (cmd->scan_begin_src == TRIG_FOLLOW) /* internal trigger */
634 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0);
635
636 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg,
637 cmd->chanlist_len);
638
639 /* check against maximum frequency */
640 if (cmd->scan_begin_src == TRIG_TIMER) {
641 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg,
642 board->ai_speed *
643 cmd->chanlist_len);
644 }
645
646 if (cmd->convert_src == TRIG_TIMER) {
647 err |= comedi_check_trigger_arg_min(&cmd->convert_arg,
648 board->ai_speed);
649 }
650
651 if (cmd->stop_src == TRIG_COUNT)
652 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1);
653 else /* TRIG_NONE */
654 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0);
655
656 if (err)
657 return 3;
658
659 /* step 4: fix up arguments */
660 if (cmd->scan_begin_src == TRIG_TIMER) {
661 arg = cmd->scan_begin_arg;
662 comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
663 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg);
664 }
665 if (cmd->convert_src == TRIG_TIMER) {
666 arg = cmd->convert_arg;
667 comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags);
668 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg);
669 }
670 if (err)
671 return 4;
672
673 /* Step 5: check channel list if it exists */
674 if (cmd->chanlist && cmd->chanlist_len > 0)
675 err |= das16_ai_check_chanlist(dev, s, cmd);
676
677 if (err)
678 return 5;
679
680 return 0;
681 }
682
das16_set_pacer(struct comedi_device * dev,unsigned int ns,unsigned int flags)683 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns,
684 unsigned int flags)
685 {
686 comedi_8254_cascade_ns_to_timer(dev->pacer, &ns, flags);
687 comedi_8254_update_divisors(dev->pacer);
688 comedi_8254_pacer_enable(dev->pacer, 1, 2, true);
689
690 return ns;
691 }
692
das16_cmd_exec(struct comedi_device * dev,struct comedi_subdevice * s)693 static int das16_cmd_exec(struct comedi_device *dev, struct comedi_subdevice *s)
694 {
695 struct das16_private_struct *devpriv = dev->private;
696 struct comedi_isadma *dma = devpriv->dma;
697 struct comedi_async *async = s->async;
698 struct comedi_cmd *cmd = &async->cmd;
699 unsigned int first_chan = CR_CHAN(cmd->chanlist[0]);
700 unsigned int last_chan = CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]);
701 unsigned int range = CR_RANGE(cmd->chanlist[0]);
702 unsigned int byte;
703 unsigned long flags;
704
705 if (cmd->flags & CMDF_PRIORITY) {
706 dev_err(dev->class_dev,
707 "isa dma transfers cannot be performed with CMDF_PRIORITY, aborting\n");
708 return -1;
709 }
710
711 if (devpriv->can_burst)
712 outb(DAS1600_CONV_DISABLE, dev->iobase + DAS1600_CONV_REG);
713
714 /* set mux and range for chanlist scan */
715 das16_ai_set_mux_range(dev, first_chan, last_chan, range);
716
717 /* set counter mode and counts */
718 cmd->convert_arg = das16_set_pacer(dev, cmd->convert_arg, cmd->flags);
719
720 /* enable counters */
721 byte = 0;
722 if (devpriv->can_burst) {
723 if (cmd->convert_src == TRIG_NOW) {
724 outb(DAS1600_BURST_VAL,
725 dev->iobase + DAS1600_BURST_REG);
726 /* set burst length */
727 byte |= DAS16_PACER_BURST_LEN(cmd->chanlist_len - 1);
728 } else {
729 outb(0, dev->iobase + DAS1600_BURST_REG);
730 }
731 }
732 outb(byte, dev->iobase + DAS16_PACER_REG);
733
734 /* set up dma transfer */
735 dma->cur_dma = 0;
736 das16_ai_setup_dma(dev, s, 0);
737
738 /* set up timer */
739 spin_lock_irqsave(&dev->spinlock, flags);
740 devpriv->timer_running = 1;
741 devpriv->timer.expires = jiffies + timer_period();
742 add_timer(&devpriv->timer);
743
744 /* enable DMA interrupt with external or internal pacing */
745 devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_PACING_MASK);
746 devpriv->ctrl_reg |= DAS16_CTRL_DMAE;
747 if (cmd->convert_src == TRIG_EXT)
748 devpriv->ctrl_reg |= DAS16_CTRL_EXT_PACER;
749 else
750 devpriv->ctrl_reg |= DAS16_CTRL_INT_PACER;
751 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
752
753 if (devpriv->can_burst)
754 outb(0, dev->iobase + DAS1600_CONV_REG);
755 spin_unlock_irqrestore(&dev->spinlock, flags);
756
757 return 0;
758 }
759
das16_cancel(struct comedi_device * dev,struct comedi_subdevice * s)760 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
761 {
762 struct das16_private_struct *devpriv = dev->private;
763 struct comedi_isadma *dma = devpriv->dma;
764 unsigned long flags;
765
766 spin_lock_irqsave(&dev->spinlock, flags);
767
768 /* disable interrupts, dma and pacer clocked conversions */
769 devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_DMAE |
770 DAS16_CTRL_PACING_MASK);
771 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
772
773 comedi_isadma_disable(dma->chan);
774
775 /* disable SW timer */
776 if (devpriv->timer_running) {
777 devpriv->timer_running = 0;
778 del_timer(&devpriv->timer);
779 }
780
781 if (devpriv->can_burst)
782 outb(0, dev->iobase + DAS1600_BURST_REG);
783
784 spin_unlock_irqrestore(&dev->spinlock, flags);
785
786 return 0;
787 }
788
das16_ai_munge(struct comedi_device * dev,struct comedi_subdevice * s,void * array,unsigned int num_bytes,unsigned int start_chan_index)789 static void das16_ai_munge(struct comedi_device *dev,
790 struct comedi_subdevice *s, void *array,
791 unsigned int num_bytes,
792 unsigned int start_chan_index)
793 {
794 unsigned short *data = array;
795 unsigned int num_samples = comedi_bytes_to_samples(s, num_bytes);
796 unsigned int i;
797 __le16 *buf = array;
798
799 for (i = 0; i < num_samples; i++) {
800 data[i] = le16_to_cpu(buf[i]);
801 if (s->maxdata == 0x0fff)
802 data[i] >>= 4;
803 data[i] &= s->maxdata;
804 }
805 }
806
das16_ai_eoc(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_insn * insn,unsigned long context)807 static int das16_ai_eoc(struct comedi_device *dev,
808 struct comedi_subdevice *s,
809 struct comedi_insn *insn,
810 unsigned long context)
811 {
812 unsigned int status;
813
814 status = inb(dev->iobase + DAS16_STATUS_REG);
815 if ((status & DAS16_STATUS_BUSY) == 0)
816 return 0;
817 return -EBUSY;
818 }
819
das16_ai_insn_read(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_insn * insn,unsigned int * data)820 static int das16_ai_insn_read(struct comedi_device *dev,
821 struct comedi_subdevice *s,
822 struct comedi_insn *insn,
823 unsigned int *data)
824 {
825 unsigned int chan = CR_CHAN(insn->chanspec);
826 unsigned int range = CR_RANGE(insn->chanspec);
827 unsigned int val;
828 int ret;
829 int i;
830
831 /* set mux and range for single channel */
832 das16_ai_set_mux_range(dev, chan, chan, range);
833
834 for (i = 0; i < insn->n; i++) {
835 /* trigger conversion */
836 outb_p(0, dev->iobase + DAS16_TRIG_REG);
837
838 ret = comedi_timeout(dev, s, insn, das16_ai_eoc, 0);
839 if (ret)
840 return ret;
841
842 val = inb(dev->iobase + DAS16_AI_MSB_REG) << 8;
843 val |= inb(dev->iobase + DAS16_AI_LSB_REG);
844 if (s->maxdata == 0x0fff)
845 val >>= 4;
846 val &= s->maxdata;
847
848 data[i] = val;
849 }
850
851 return insn->n;
852 }
853
das16_ao_insn_write(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_insn * insn,unsigned int * data)854 static int das16_ao_insn_write(struct comedi_device *dev,
855 struct comedi_subdevice *s,
856 struct comedi_insn *insn,
857 unsigned int *data)
858 {
859 unsigned int chan = CR_CHAN(insn->chanspec);
860 int i;
861
862 for (i = 0; i < insn->n; i++) {
863 unsigned int val = data[i];
864
865 s->readback[chan] = val;
866
867 val <<= 4;
868
869 outb(val & 0xff, dev->iobase + DAS16_AO_LSB_REG(chan));
870 outb((val >> 8) & 0xff, dev->iobase + DAS16_AO_MSB_REG(chan));
871 }
872
873 return insn->n;
874 }
875
das16_di_insn_bits(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_insn * insn,unsigned int * data)876 static int das16_di_insn_bits(struct comedi_device *dev,
877 struct comedi_subdevice *s,
878 struct comedi_insn *insn,
879 unsigned int *data)
880 {
881 data[1] = inb(dev->iobase + DAS16_DIO_REG) & 0xf;
882
883 return insn->n;
884 }
885
das16_do_insn_bits(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_insn * insn,unsigned int * data)886 static int das16_do_insn_bits(struct comedi_device *dev,
887 struct comedi_subdevice *s,
888 struct comedi_insn *insn,
889 unsigned int *data)
890 {
891 if (comedi_dio_update_state(s, data))
892 outb(s->state, dev->iobase + DAS16_DIO_REG);
893
894 data[1] = s->state;
895
896 return insn->n;
897 }
898
das16_probe(struct comedi_device * dev,struct comedi_devconfig * it)899 static int das16_probe(struct comedi_device *dev, struct comedi_devconfig *it)
900 {
901 const struct das16_board *board = dev->board_ptr;
902 int diobits;
903
904 /* diobits indicates boards */
905 diobits = inb(dev->iobase + DAS16_DIO_REG) & 0xf0;
906 if (board->id != diobits) {
907 dev_err(dev->class_dev,
908 "requested board's id bits are incorrect (0x%x != 0x%x)\n",
909 board->id, diobits);
910 return -EINVAL;
911 }
912
913 return 0;
914 }
915
das16_reset(struct comedi_device * dev)916 static void das16_reset(struct comedi_device *dev)
917 {
918 outb(0, dev->iobase + DAS16_STATUS_REG);
919 outb(0, dev->iobase + DAS16_CTRL_REG);
920 outb(0, dev->iobase + DAS16_PACER_REG);
921 }
922
das16_alloc_dma(struct comedi_device * dev,unsigned int dma_chan)923 static void das16_alloc_dma(struct comedi_device *dev, unsigned int dma_chan)
924 {
925 struct das16_private_struct *devpriv = dev->private;
926
927 timer_setup(&devpriv->timer, das16_timer_interrupt, 0);
928
929 /* only DMA channels 3 and 1 are valid */
930 if (!(dma_chan == 1 || dma_chan == 3))
931 return;
932
933 /* DMA uses two buffers */
934 devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan, dma_chan,
935 DAS16_DMA_SIZE, COMEDI_ISADMA_READ);
936 }
937
das16_free_dma(struct comedi_device * dev)938 static void das16_free_dma(struct comedi_device *dev)
939 {
940 struct das16_private_struct *devpriv = dev->private;
941
942 if (devpriv) {
943 del_timer_sync(&devpriv->timer);
944 comedi_isadma_free(devpriv->dma);
945 }
946 }
947
das16_ai_range(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_devconfig * it,unsigned int pg_type,unsigned int status)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 struct_size(lrange, range, 1));
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
das16_ao_range(struct comedi_device * dev,struct comedi_subdevice * s,struct comedi_devconfig * it)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 struct_size(lrange, range, 1));
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
das16_attach(struct comedi_device * dev,struct comedi_devconfig * it)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 osc_base;
1021 unsigned int status;
1022 int ret;
1023
1024 /* check that clock setting is valid */
1025 if (it->options[3]) {
1026 if (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 devpriv->dev = dev;
1037
1038 if (board->size < 0x400) {
1039 ret = comedi_request_region(dev, it->options[0], board->size);
1040 if (ret)
1041 return ret;
1042 } else {
1043 ret = comedi_request_region(dev, it->options[0], 0x10);
1044 if (ret)
1045 return ret;
1046 /* Request an additional region for the 8255 */
1047 ret = __comedi_request_region(dev, dev->iobase + 0x400,
1048 board->size & 0x3ff);
1049 if (ret)
1050 return ret;
1051 devpriv->extra_iobase = dev->iobase + 0x400;
1052 devpriv->can_burst = 1;
1053 }
1054
1055 /* probe id bits to make sure they are consistent */
1056 if (das16_probe(dev, it))
1057 return -EINVAL;
1058
1059 /* get master clock speed */
1060 osc_base = I8254_OSC_BASE_1MHZ;
1061 if (devpriv->can_burst) {
1062 status = inb(dev->iobase + DAS1600_STATUS_REG);
1063 if (status & DAS1600_STATUS_CLK_10MHZ)
1064 osc_base = I8254_OSC_BASE_10MHZ;
1065 } else {
1066 if (it->options[3])
1067 osc_base = I8254_OSC_BASE_1MHZ / it->options[3];
1068 }
1069
1070 dev->pacer = comedi_8254_init(dev->iobase + DAS16_TIMER_BASE_REG,
1071 osc_base, I8254_IO8, 0);
1072 if (!dev->pacer)
1073 return -ENOMEM;
1074
1075 das16_alloc_dma(dev, it->options[2]);
1076
1077 ret = comedi_alloc_subdevices(dev, 4 + board->has_8255);
1078 if (ret)
1079 return ret;
1080
1081 status = inb(dev->iobase + DAS16_STATUS_REG);
1082
1083 /* Analog Input subdevice */
1084 s = &dev->subdevices[0];
1085 s->type = COMEDI_SUBD_AI;
1086 s->subdev_flags = SDF_READABLE;
1087 if (status & DAS16_STATUS_MUXBIT) {
1088 s->subdev_flags |= SDF_GROUND;
1089 s->n_chan = 16;
1090 } else {
1091 s->subdev_flags |= SDF_DIFF;
1092 s->n_chan = 8;
1093 }
1094 s->len_chanlist = s->n_chan;
1095 s->maxdata = board->ai_maxdata;
1096 s->range_table = das16_ai_range(dev, s, it, board->ai_pg, status);
1097 s->insn_read = das16_ai_insn_read;
1098 if (devpriv->dma) {
1099 dev->read_subdev = s;
1100 s->subdev_flags |= SDF_CMD_READ;
1101 s->do_cmdtest = das16_cmd_test;
1102 s->do_cmd = das16_cmd_exec;
1103 s->cancel = das16_cancel;
1104 s->munge = das16_ai_munge;
1105 }
1106
1107 /* Analog Output subdevice */
1108 s = &dev->subdevices[1];
1109 if (board->has_ao) {
1110 s->type = COMEDI_SUBD_AO;
1111 s->subdev_flags = SDF_WRITABLE;
1112 s->n_chan = 2;
1113 s->maxdata = 0x0fff;
1114 s->range_table = das16_ao_range(dev, s, it);
1115 s->insn_write = das16_ao_insn_write;
1116
1117 ret = comedi_alloc_subdev_readback(s);
1118 if (ret)
1119 return ret;
1120 } else {
1121 s->type = COMEDI_SUBD_UNUSED;
1122 }
1123
1124 /* Digital Input subdevice */
1125 s = &dev->subdevices[2];
1126 s->type = COMEDI_SUBD_DI;
1127 s->subdev_flags = SDF_READABLE;
1128 s->n_chan = 4;
1129 s->maxdata = 1;
1130 s->range_table = &range_digital;
1131 s->insn_bits = das16_di_insn_bits;
1132
1133 /* Digital Output subdevice */
1134 s = &dev->subdevices[3];
1135 s->type = COMEDI_SUBD_DO;
1136 s->subdev_flags = SDF_WRITABLE;
1137 s->n_chan = 4;
1138 s->maxdata = 1;
1139 s->range_table = &range_digital;
1140 s->insn_bits = das16_do_insn_bits;
1141
1142 /* initialize digital output lines */
1143 outb(s->state, dev->iobase + DAS16_DIO_REG);
1144
1145 /* 8255 Digital I/O subdevice */
1146 if (board->has_8255) {
1147 s = &dev->subdevices[4];
1148 ret = subdev_8255_init(dev, s, NULL, board->i8255_offset);
1149 if (ret)
1150 return ret;
1151 }
1152
1153 das16_reset(dev);
1154 /* set the interrupt level */
1155 devpriv->ctrl_reg = DAS16_CTRL_IRQ(dev->irq);
1156 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG);
1157
1158 if (devpriv->can_burst) {
1159 outb(DAS1600_ENABLE_VAL, dev->iobase + DAS1600_ENABLE_REG);
1160 outb(0, dev->iobase + DAS1600_CONV_REG);
1161 outb(0, dev->iobase + DAS1600_BURST_REG);
1162 }
1163
1164 return 0;
1165 }
1166
das16_detach(struct comedi_device * dev)1167 static void das16_detach(struct comedi_device *dev)
1168 {
1169 const struct das16_board *board = dev->board_ptr;
1170 struct das16_private_struct *devpriv = dev->private;
1171
1172 if (devpriv) {
1173 if (dev->iobase)
1174 das16_reset(dev);
1175 das16_free_dma(dev);
1176
1177 if (devpriv->extra_iobase)
1178 release_region(devpriv->extra_iobase,
1179 board->size & 0x3ff);
1180 }
1181
1182 comedi_legacy_detach(dev);
1183 }
1184
1185 static struct comedi_driver das16_driver = {
1186 .driver_name = "das16",
1187 .module = THIS_MODULE,
1188 .attach = das16_attach,
1189 .detach = das16_detach,
1190 .board_name = &das16_boards[0].name,
1191 .num_names = ARRAY_SIZE(das16_boards),
1192 .offset = sizeof(das16_boards[0]),
1193 };
1194 module_comedi_driver(das16_driver);
1195
1196 MODULE_AUTHOR("Comedi https://www.comedi.org");
1197 MODULE_DESCRIPTION("Comedi driver for DAS16 compatible boards");
1198 MODULE_LICENSE("GPL");
1199