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Linux 3.9-rc5
[deliverable/linux.git] / drivers / staging / comedi / drivers / das1800.c
1 /*
2 comedi/drivers/das1800.c
3 Driver for Keitley das1700/das1800 series boards
4 Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net>
5
6 COMEDI - Linux Control and Measurement Device Interface
7 Copyright (C) 2000 David A. Schleef <ds@schleef.org>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22
23 ************************************************************************
24 */
25 /*
26 Driver: das1800
27 Description: Keithley Metrabyte DAS1800 (& compatibles)
28 Author: Frank Mori Hess <fmhess@users.sourceforge.net>
29 Devices: [Keithley Metrabyte] DAS-1701ST (das-1701st),
30 DAS-1701ST-DA (das-1701st-da), DAS-1701/AO (das-1701ao),
31 DAS-1702ST (das-1702st), DAS-1702ST-DA (das-1702st-da),
32 DAS-1702HR (das-1702hr), DAS-1702HR-DA (das-1702hr-da),
33 DAS-1702/AO (das-1702ao), DAS-1801ST (das-1801st),
34 DAS-1801ST-DA (das-1801st-da), DAS-1801HC (das-1801hc),
35 DAS-1801AO (das-1801ao), DAS-1802ST (das-1802st),
36 DAS-1802ST-DA (das-1802st-da), DAS-1802HR (das-1802hr),
37 DAS-1802HR-DA (das-1802hr-da), DAS-1802HC (das-1802hc),
38 DAS-1802AO (das-1802ao)
39 Status: works
40
41 The waveform analog output on the 'ao' cards is not supported.
42 If you need it, send me (Frank Hess) an email.
43
44 Configuration options:
45 [0] - I/O port base address
46 [1] - IRQ (optional, required for timed or externally triggered conversions)
47 [2] - DMA0 (optional, requires irq)
48 [3] - DMA1 (optional, requires irq and dma0)
49 */
50 /*
51
52 This driver supports the following Keithley boards:
53
54 das-1701st
55 das-1701st-da
56 das-1701ao
57 das-1702st
58 das-1702st-da
59 das-1702hr
60 das-1702hr-da
61 das-1702ao
62 das-1801st
63 das-1801st-da
64 das-1801hc
65 das-1801ao
66 das-1802st
67 das-1802st-da
68 das-1802hr
69 das-1802hr-da
70 das-1802hc
71 das-1802ao
72
73 Options:
74 [0] - base io address
75 [1] - irq (optional, required for timed or externally triggered conversions)
76 [2] - dma0 (optional, requires irq)
77 [3] - dma1 (optional, requires irq and dma0)
78
79 irq can be omitted, although the cmd interface will not work without it.
80
81 analog input cmd triggers supported:
82 start_src: TRIG_NOW | TRIG_EXT
83 scan_begin_src: TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT
84 scan_end_src: TRIG_COUNT
85 convert_src: TRIG_TIMER | TRIG_EXT (TRIG_EXT requires scan_begin_src == TRIG_FOLLOW)
86 stop_src: TRIG_COUNT | TRIG_EXT | TRIG_NONE
87
88 scan_begin_src triggers TRIG_TIMER and TRIG_EXT use the card's
89 'burst mode' which limits the valid conversion time to 64 microseconds
90 (convert_arg <= 64000). This limitation does not apply if scan_begin_src
91 is TRIG_FOLLOW.
92
93 NOTES:
94 Only the DAS-1801ST has been tested by me.
95 Unipolar and bipolar ranges cannot be mixed in the channel/gain list.
96
97 TODO:
98 Make it automatically allocate irq and dma channels if they are not specified
99 Add support for analog out on 'ao' cards
100 read insn for analog out
101 */
102
103 #include <linux/interrupt.h>
104 #include <linux/slab.h>
105 #include <linux/io.h>
106 #include "../comedidev.h"
107
108 #include <linux/ioport.h>
109 #include <asm/dma.h>
110
111 #include "8253.h"
112 #include "comedi_fc.h"
113
114 /* misc. defines */
115 #define DAS1800_SIZE 16 /* uses 16 io addresses */
116 #define FIFO_SIZE 1024 /* 1024 sample fifo */
117 #define TIMER_BASE 200 /* 5 Mhz master clock */
118 #define UNIPOLAR 0x4 /* bit that determines whether input range is uni/bipolar */
119 #define DMA_BUF_SIZE 0x1ff00 /* size in bytes of dma buffers */
120
121 /* Registers for the das1800 */
122 #define DAS1800_FIFO 0x0
123 #define DAS1800_QRAM 0x0
124 #define DAS1800_DAC 0x0
125 #define DAS1800_SELECT 0x2
126 #define ADC 0x0
127 #define QRAM 0x1
128 #define DAC(a) (0x2 + a)
129 #define DAS1800_DIGITAL 0x3
130 #define DAS1800_CONTROL_A 0x4
131 #define FFEN 0x1
132 #define CGEN 0x4
133 #define CGSL 0x8
134 #define TGEN 0x10
135 #define TGSL 0x20
136 #define ATEN 0x80
137 #define DAS1800_CONTROL_B 0x5
138 #define DMA_CH5 0x1
139 #define DMA_CH6 0x2
140 #define DMA_CH7 0x3
141 #define DMA_CH5_CH6 0x5
142 #define DMA_CH6_CH7 0x6
143 #define DMA_CH7_CH5 0x7
144 #define DMA_ENABLED 0x3 /* mask used to determine if dma is enabled */
145 #define DMA_DUAL 0x4
146 #define IRQ3 0x8
147 #define IRQ5 0x10
148 #define IRQ7 0x18
149 #define IRQ10 0x28
150 #define IRQ11 0x30
151 #define IRQ15 0x38
152 #define FIMD 0x40
153 #define DAS1800_CONTROL_C 0X6
154 #define IPCLK 0x1
155 #define XPCLK 0x3
156 #define BMDE 0x4
157 #define CMEN 0x8
158 #define UQEN 0x10
159 #define SD 0x40
160 #define UB 0x80
161 #define DAS1800_STATUS 0x7
162 /* bits that prevent interrupt status bits (and CVEN) from being cleared on write */
163 #define CLEAR_INTR_MASK (CVEN_MASK | 0x1f)
164 #define INT 0x1
165 #define DMATC 0x2
166 #define CT0TC 0x8
167 #define OVF 0x10
168 #define FHF 0x20
169 #define FNE 0x40
170 #define CVEN_MASK 0x40 /* masks CVEN on write */
171 #define CVEN 0x80
172 #define DAS1800_BURST_LENGTH 0x8
173 #define DAS1800_BURST_RATE 0x9
174 #define DAS1800_QRAM_ADDRESS 0xa
175 #define DAS1800_COUNTER 0xc
176
177 #define IOBASE2 0x400 /* offset of additional ioports used on 'ao' cards */
178
179 enum {
180 das1701st, das1701st_da, das1702st, das1702st_da, das1702hr,
181 das1702hr_da,
182 das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da,
183 das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao
184 };
185
186 /* analog input ranges */
187 static const struct comedi_lrange range_ai_das1801 = {
188 8,
189 {
190 RANGE(-5, 5),
191 RANGE(-1, 1),
192 RANGE(-0.1, 0.1),
193 RANGE(-0.02, 0.02),
194 RANGE(0, 5),
195 RANGE(0, 1),
196 RANGE(0, 0.1),
197 RANGE(0, 0.02),
198 }
199 };
200
201 static const struct comedi_lrange range_ai_das1802 = {
202 8,
203 {
204 RANGE(-10, 10),
205 RANGE(-5, 5),
206 RANGE(-2.5, 2.5),
207 RANGE(-1.25, 1.25),
208 RANGE(0, 10),
209 RANGE(0, 5),
210 RANGE(0, 2.5),
211 RANGE(0, 1.25),
212 }
213 };
214
215 struct das1800_board {
216 const char *name;
217 int ai_speed; /* max conversion period in nanoseconds */
218 int resolution; /* bits of ai resolution */
219 int qram_len; /* length of card's channel / gain queue */
220 int common; /* supports AREF_COMMON flag */
221 int do_n_chan; /* number of digital output channels */
222 int ao_ability; /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */
223 int ao_n_chan; /* number of analog out channels */
224 const struct comedi_lrange *range_ai; /* available input ranges */
225 };
226
227 /* Warning: the maximum conversion speeds listed below are
228 * not always achievable depending on board setup (see
229 * user manual.)
230 */
231 static const struct das1800_board das1800_boards[] = {
232 {
233 .name = "das-1701st",
234 .ai_speed = 6250,
235 .resolution = 12,
236 .qram_len = 256,
237 .common = 1,
238 .do_n_chan = 4,
239 .ao_ability = 0,
240 .ao_n_chan = 0,
241 .range_ai = &range_ai_das1801,
242 },
243 {
244 .name = "das-1701st-da",
245 .ai_speed = 6250,
246 .resolution = 12,
247 .qram_len = 256,
248 .common = 1,
249 .do_n_chan = 4,
250 .ao_ability = 1,
251 .ao_n_chan = 4,
252 .range_ai = &range_ai_das1801,
253 },
254 {
255 .name = "das-1702st",
256 .ai_speed = 6250,
257 .resolution = 12,
258 .qram_len = 256,
259 .common = 1,
260 .do_n_chan = 4,
261 .ao_ability = 0,
262 .ao_n_chan = 0,
263 .range_ai = &range_ai_das1802,
264 },
265 {
266 .name = "das-1702st-da",
267 .ai_speed = 6250,
268 .resolution = 12,
269 .qram_len = 256,
270 .common = 1,
271 .do_n_chan = 4,
272 .ao_ability = 1,
273 .ao_n_chan = 4,
274 .range_ai = &range_ai_das1802,
275 },
276 {
277 .name = "das-1702hr",
278 .ai_speed = 20000,
279 .resolution = 16,
280 .qram_len = 256,
281 .common = 1,
282 .do_n_chan = 4,
283 .ao_ability = 0,
284 .ao_n_chan = 0,
285 .range_ai = &range_ai_das1802,
286 },
287 {
288 .name = "das-1702hr-da",
289 .ai_speed = 20000,
290 .resolution = 16,
291 .qram_len = 256,
292 .common = 1,
293 .do_n_chan = 4,
294 .ao_ability = 1,
295 .ao_n_chan = 2,
296 .range_ai = &range_ai_das1802,
297 },
298 {
299 .name = "das-1701ao",
300 .ai_speed = 6250,
301 .resolution = 12,
302 .qram_len = 256,
303 .common = 1,
304 .do_n_chan = 4,
305 .ao_ability = 2,
306 .ao_n_chan = 2,
307 .range_ai = &range_ai_das1801,
308 },
309 {
310 .name = "das-1702ao",
311 .ai_speed = 6250,
312 .resolution = 12,
313 .qram_len = 256,
314 .common = 1,
315 .do_n_chan = 4,
316 .ao_ability = 2,
317 .ao_n_chan = 2,
318 .range_ai = &range_ai_das1802,
319 },
320 {
321 .name = "das-1801st",
322 .ai_speed = 3000,
323 .resolution = 12,
324 .qram_len = 256,
325 .common = 1,
326 .do_n_chan = 4,
327 .ao_ability = 0,
328 .ao_n_chan = 0,
329 .range_ai = &range_ai_das1801,
330 },
331 {
332 .name = "das-1801st-da",
333 .ai_speed = 3000,
334 .resolution = 12,
335 .qram_len = 256,
336 .common = 1,
337 .do_n_chan = 4,
338 .ao_ability = 0,
339 .ao_n_chan = 4,
340 .range_ai = &range_ai_das1801,
341 },
342 {
343 .name = "das-1802st",
344 .ai_speed = 3000,
345 .resolution = 12,
346 .qram_len = 256,
347 .common = 1,
348 .do_n_chan = 4,
349 .ao_ability = 0,
350 .ao_n_chan = 0,
351 .range_ai = &range_ai_das1802,
352 },
353 {
354 .name = "das-1802st-da",
355 .ai_speed = 3000,
356 .resolution = 12,
357 .qram_len = 256,
358 .common = 1,
359 .do_n_chan = 4,
360 .ao_ability = 1,
361 .ao_n_chan = 4,
362 .range_ai = &range_ai_das1802,
363 },
364 {
365 .name = "das-1802hr",
366 .ai_speed = 10000,
367 .resolution = 16,
368 .qram_len = 256,
369 .common = 1,
370 .do_n_chan = 4,
371 .ao_ability = 0,
372 .ao_n_chan = 0,
373 .range_ai = &range_ai_das1802,
374 },
375 {
376 .name = "das-1802hr-da",
377 .ai_speed = 10000,
378 .resolution = 16,
379 .qram_len = 256,
380 .common = 1,
381 .do_n_chan = 4,
382 .ao_ability = 1,
383 .ao_n_chan = 2,
384 .range_ai = &range_ai_das1802,
385 },
386 {
387 .name = "das-1801hc",
388 .ai_speed = 3000,
389 .resolution = 12,
390 .qram_len = 64,
391 .common = 0,
392 .do_n_chan = 8,
393 .ao_ability = 1,
394 .ao_n_chan = 2,
395 .range_ai = &range_ai_das1801,
396 },
397 {
398 .name = "das-1802hc",
399 .ai_speed = 3000,
400 .resolution = 12,
401 .qram_len = 64,
402 .common = 0,
403 .do_n_chan = 8,
404 .ao_ability = 1,
405 .ao_n_chan = 2,
406 .range_ai = &range_ai_das1802,
407 },
408 {
409 .name = "das-1801ao",
410 .ai_speed = 3000,
411 .resolution = 12,
412 .qram_len = 256,
413 .common = 1,
414 .do_n_chan = 4,
415 .ao_ability = 2,
416 .ao_n_chan = 2,
417 .range_ai = &range_ai_das1801,
418 },
419 {
420 .name = "das-1802ao",
421 .ai_speed = 3000,
422 .resolution = 12,
423 .qram_len = 256,
424 .common = 1,
425 .do_n_chan = 4,
426 .ao_ability = 2,
427 .ao_n_chan = 2,
428 .range_ai = &range_ai_das1802,
429 },
430 };
431
432 /*
433 * Useful for shorthand access to the particular board structure
434 */
435 #define thisboard ((const struct das1800_board *)dev->board_ptr)
436
437 struct das1800_private {
438 volatile unsigned int count; /* number of data points left to be taken */
439 unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */
440 unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */
441 int do_bits; /* digital output bits */
442 int irq_dma_bits; /* bits for control register b */
443 /* dma bits for control register b, stored so that dma can be
444 * turned on and off */
445 int dma_bits;
446 unsigned int dma0; /* dma channels used */
447 unsigned int dma1;
448 volatile unsigned int dma_current; /* dma channel currently in use */
449 uint16_t *ai_buf0; /* pointers to dma buffers */
450 uint16_t *ai_buf1;
451 uint16_t *dma_current_buf; /* pointer to dma buffer currently being used */
452 unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
453 unsigned long iobase2; /* secondary io address used for analog out on 'ao' boards */
454 short ao_update_bits; /* remembers the last write to the 'update' dac */
455 };
456
457 /* analog out range for boards with basic analog out */
458 static const struct comedi_lrange range_ao_1 = {
459 1,
460 {
461 RANGE(-10, 10),
462 }
463 };
464
465 /* analog out range for 'ao' boards */
466 /*
467 static const struct comedi_lrange range_ao_2 = {
468 2,
469 {
470 RANGE(-10, 10),
471 RANGE(-5, 5),
472 }
473 };
474 */
475
476 static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
477 uint16_t sample)
478 {
479 sample += 1 << (thisboard->resolution - 1);
480 return sample;
481 }
482
483 static void munge_data(struct comedi_device *dev, uint16_t * array,
484 unsigned int num_elements)
485 {
486 unsigned int i;
487 int unipolar;
488
489 /* see if card is using a unipolar or bipolar range so we can munge data correctly */
490 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
491
492 /* convert to unsigned type if we are in a bipolar mode */
493 if (!unipolar) {
494 for (i = 0; i < num_elements; i++)
495 array[i] = munge_bipolar_sample(dev, array[i]);
496 }
497 }
498
499 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
500 struct comedi_subdevice *s)
501 {
502 struct das1800_private *devpriv = dev->private;
503 int numPoints = 0; /* number of points to read */
504 struct comedi_cmd *cmd = &s->async->cmd;
505
506 numPoints = FIFO_SIZE / 2;
507 /* if we only need some of the points */
508 if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
509 numPoints = devpriv->count;
510 insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
511 munge_data(dev, devpriv->ai_buf0, numPoints);
512 cfc_write_array_to_buffer(s, devpriv->ai_buf0,
513 numPoints * sizeof(devpriv->ai_buf0[0]));
514 if (cmd->stop_src == TRIG_COUNT)
515 devpriv->count -= numPoints;
516 return;
517 }
518
519 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
520 struct comedi_subdevice *s)
521 {
522 struct das1800_private *devpriv = dev->private;
523 short dpnt;
524 int unipolar;
525 struct comedi_cmd *cmd = &s->async->cmd;
526
527 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
528
529 while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
530 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
531 break;
532 dpnt = inw(dev->iobase + DAS1800_FIFO);
533 /* convert to unsigned type if we are in a bipolar mode */
534 if (!unipolar)
535 ;
536 dpnt = munge_bipolar_sample(dev, dpnt);
537 cfc_write_to_buffer(s, dpnt);
538 if (cmd->stop_src == TRIG_COUNT)
539 devpriv->count--;
540 }
541
542 return;
543 }
544
545 /* Utility function used by das1800_flush_dma() and das1800_handle_dma().
546 * Assumes dma lock is held */
547 static void das1800_flush_dma_channel(struct comedi_device *dev,
548 struct comedi_subdevice *s,
549 unsigned int channel, uint16_t *buffer)
550 {
551 struct das1800_private *devpriv = dev->private;
552 unsigned int num_bytes, num_samples;
553 struct comedi_cmd *cmd = &s->async->cmd;
554
555 disable_dma(channel);
556
557 /* clear flip-flop to make sure 2-byte registers
558 * get set correctly */
559 clear_dma_ff(channel);
560
561 /* figure out how many points to read */
562 num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
563 num_samples = num_bytes / sizeof(short);
564
565 /* if we only need some of the points */
566 if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
567 num_samples = devpriv->count;
568
569 munge_data(dev, buffer, num_samples);
570 cfc_write_array_to_buffer(s, buffer, num_bytes);
571 if (s->async->cmd.stop_src == TRIG_COUNT)
572 devpriv->count -= num_samples;
573
574 return;
575 }
576
577 /* flushes remaining data from board when external trigger has stopped acquisition
578 * and we are using dma transfers */
579 static void das1800_flush_dma(struct comedi_device *dev,
580 struct comedi_subdevice *s)
581 {
582 struct das1800_private *devpriv = dev->private;
583 unsigned long flags;
584 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
585
586 flags = claim_dma_lock();
587 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
588 devpriv->dma_current_buf);
589
590 if (dual_dma) {
591 /* switch to other channel and flush it */
592 if (devpriv->dma_current == devpriv->dma0) {
593 devpriv->dma_current = devpriv->dma1;
594 devpriv->dma_current_buf = devpriv->ai_buf1;
595 } else {
596 devpriv->dma_current = devpriv->dma0;
597 devpriv->dma_current_buf = devpriv->ai_buf0;
598 }
599 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
600 devpriv->dma_current_buf);
601 }
602
603 release_dma_lock(flags);
604
605 /* get any remaining samples in fifo */
606 das1800_handle_fifo_not_empty(dev, s);
607
608 return;
609 }
610
611 static void das1800_handle_dma(struct comedi_device *dev,
612 struct comedi_subdevice *s, unsigned int status)
613 {
614 struct das1800_private *devpriv = dev->private;
615 unsigned long flags;
616 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
617
618 flags = claim_dma_lock();
619 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
620 devpriv->dma_current_buf);
621 /* re-enable dma channel */
622 set_dma_addr(devpriv->dma_current,
623 virt_to_bus(devpriv->dma_current_buf));
624 set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
625 enable_dma(devpriv->dma_current);
626 release_dma_lock(flags);
627
628 if (status & DMATC) {
629 /* clear DMATC interrupt bit */
630 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
631 /* switch dma channels for next time, if appropriate */
632 if (dual_dma) {
633 /* read data from the other channel next time */
634 if (devpriv->dma_current == devpriv->dma0) {
635 devpriv->dma_current = devpriv->dma1;
636 devpriv->dma_current_buf = devpriv->ai_buf1;
637 } else {
638 devpriv->dma_current = devpriv->dma0;
639 devpriv->dma_current_buf = devpriv->ai_buf0;
640 }
641 }
642 }
643
644 return;
645 }
646
647 static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
648 {
649 struct das1800_private *devpriv = dev->private;
650
651 outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */
652 outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */
653 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */
654 if (devpriv->dma0)
655 disable_dma(devpriv->dma0);
656 if (devpriv->dma1)
657 disable_dma(devpriv->dma1);
658 return 0;
659 }
660
661 /* the guts of the interrupt handler, that is shared with das1800_ai_poll */
662 static void das1800_ai_handler(struct comedi_device *dev)
663 {
664 struct das1800_private *devpriv = dev->private;
665 struct comedi_subdevice *s = &dev->subdevices[0];
666 struct comedi_async *async = s->async;
667 struct comedi_cmd *cmd = &async->cmd;
668 unsigned int status = inb(dev->iobase + DAS1800_STATUS);
669
670 async->events = 0;
671 /* select adc for base address + 0 */
672 outb(ADC, dev->iobase + DAS1800_SELECT);
673 /* dma buffer full */
674 if (devpriv->irq_dma_bits & DMA_ENABLED) {
675 /* look for data from dma transfer even if dma terminal count hasn't happened yet */
676 das1800_handle_dma(dev, s, status);
677 } else if (status & FHF) { /* if fifo half full */
678 das1800_handle_fifo_half_full(dev, s);
679 } else if (status & FNE) { /* if fifo not empty */
680 das1800_handle_fifo_not_empty(dev, s);
681 }
682
683 async->events |= COMEDI_CB_BLOCK;
684 /* if the card's fifo has overflowed */
685 if (status & OVF) {
686 /* clear OVF interrupt bit */
687 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
688 comedi_error(dev, "DAS1800 FIFO overflow");
689 das1800_cancel(dev, s);
690 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
691 comedi_event(dev, s);
692 return;
693 }
694 /* stop taking data if appropriate */
695 /* stop_src TRIG_EXT */
696 if (status & CT0TC) {
697 /* clear CT0TC interrupt bit */
698 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
699 /* make sure we get all remaining data from board before quitting */
700 if (devpriv->irq_dma_bits & DMA_ENABLED)
701 das1800_flush_dma(dev, s);
702 else
703 das1800_handle_fifo_not_empty(dev, s);
704 das1800_cancel(dev, s); /* disable hardware conversions */
705 async->events |= COMEDI_CB_EOA;
706 } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */
707 das1800_cancel(dev, s); /* disable hardware conversions */
708 async->events |= COMEDI_CB_EOA;
709 }
710
711 comedi_event(dev, s);
712
713 return;
714 }
715
716 static int das1800_ai_poll(struct comedi_device *dev,
717 struct comedi_subdevice *s)
718 {
719 unsigned long flags;
720
721 /* prevent race with interrupt handler */
722 spin_lock_irqsave(&dev->spinlock, flags);
723 das1800_ai_handler(dev);
724 spin_unlock_irqrestore(&dev->spinlock, flags);
725
726 return s->async->buf_write_count - s->async->buf_read_count;
727 }
728
729 static irqreturn_t das1800_interrupt(int irq, void *d)
730 {
731 struct comedi_device *dev = d;
732 unsigned int status;
733
734 if (dev->attached == 0) {
735 comedi_error(dev, "premature interrupt");
736 return IRQ_HANDLED;
737 }
738
739 /* Prevent race with das1800_ai_poll() on multi processor systems.
740 * Also protects indirect addressing in das1800_ai_handler */
741 spin_lock(&dev->spinlock);
742 status = inb(dev->iobase + DAS1800_STATUS);
743
744 /* if interrupt was not caused by das-1800 */
745 if (!(status & INT)) {
746 spin_unlock(&dev->spinlock);
747 return IRQ_NONE;
748 }
749 /* clear the interrupt status bit INT */
750 outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
751 /* handle interrupt */
752 das1800_ai_handler(dev);
753
754 spin_unlock(&dev->spinlock);
755 return IRQ_HANDLED;
756 }
757
758 /* converts requested conversion timing to timing compatible with
759 * hardware, used only when card is in 'burst mode'
760 */
761 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
762 {
763 unsigned int micro_sec;
764
765 /* in burst mode, the maximum conversion time is 64 microseconds */
766 if (convert_arg > 64000)
767 convert_arg = 64000;
768
769 /* the conversion time must be an integral number of microseconds */
770 switch (round_mode) {
771 case TRIG_ROUND_NEAREST:
772 default:
773 micro_sec = (convert_arg + 500) / 1000;
774 break;
775 case TRIG_ROUND_DOWN:
776 micro_sec = convert_arg / 1000;
777 break;
778 case TRIG_ROUND_UP:
779 micro_sec = (convert_arg - 1) / 1000 + 1;
780 break;
781 }
782
783 /* return number of nanoseconds */
784 return micro_sec * 1000;
785 }
786
787 /* test analog input cmd */
788 static int das1800_ai_do_cmdtest(struct comedi_device *dev,
789 struct comedi_subdevice *s,
790 struct comedi_cmd *cmd)
791 {
792 struct das1800_private *devpriv = dev->private;
793 int err = 0;
794 unsigned int tmp_arg;
795 int i;
796 int unipolar;
797
798 /* Step 1 : check if triggers are trivially valid */
799
800 err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT);
801 err |= cfc_check_trigger_src(&cmd->scan_begin_src,
802 TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT);
803 err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER | TRIG_EXT);
804 err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
805 err |= cfc_check_trigger_src(&cmd->stop_src,
806 TRIG_COUNT | TRIG_EXT | TRIG_NONE);
807
808 if (err)
809 return 1;
810
811 /* Step 2a : make sure trigger sources are unique */
812
813 err |= cfc_check_trigger_is_unique(cmd->start_src);
814 err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
815 err |= cfc_check_trigger_is_unique(cmd->convert_src);
816 err |= cfc_check_trigger_is_unique(cmd->stop_src);
817
818 /* Step 2b : and mutually compatible */
819
820 if (cmd->scan_begin_src != TRIG_FOLLOW &&
821 cmd->convert_src != TRIG_TIMER)
822 err |= -EINVAL;
823
824 if (err)
825 return 2;
826
827 /* Step 3: check if arguments are trivially valid */
828
829 err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
830
831 if (cmd->convert_src == TRIG_TIMER)
832 err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
833 thisboard->ai_speed);
834
835 err |= cfc_check_trigger_arg_min(&cmd->chanlist_len, 1);
836 err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
837
838 switch (cmd->stop_src) {
839 case TRIG_COUNT:
840 err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
841 break;
842 case TRIG_NONE:
843 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
844 break;
845 default:
846 break;
847 }
848
849 if (err)
850 return 3;
851
852 /* step 4: fix up any arguments */
853
854 if (cmd->convert_src == TRIG_TIMER) {
855 /* if we are not in burst mode */
856 if (cmd->scan_begin_src == TRIG_FOLLOW) {
857 tmp_arg = cmd->convert_arg;
858 /* calculate counter values that give desired timing */
859 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
860 &(devpriv->divisor1),
861 &(devpriv->divisor2),
862 &(cmd->convert_arg),
863 cmd->
864 flags & TRIG_ROUND_MASK);
865 if (tmp_arg != cmd->convert_arg)
866 err++;
867 }
868 /* if we are in burst mode */
869 else {
870 /* check that convert_arg is compatible */
871 tmp_arg = cmd->convert_arg;
872 cmd->convert_arg =
873 burst_convert_arg(cmd->convert_arg,
874 cmd->flags & TRIG_ROUND_MASK);
875 if (tmp_arg != cmd->convert_arg)
876 err++;
877
878 if (cmd->scan_begin_src == TRIG_TIMER) {
879 /* if scans are timed faster than conversion rate allows */
880 if (cmd->convert_arg * cmd->chanlist_len >
881 cmd->scan_begin_arg) {
882 cmd->scan_begin_arg =
883 cmd->convert_arg *
884 cmd->chanlist_len;
885 err++;
886 }
887 tmp_arg = cmd->scan_begin_arg;
888 /* calculate counter values that give desired timing */
889 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
890 &(devpriv->
891 divisor1),
892 &(devpriv->
893 divisor2),
894 &(cmd->
895 scan_begin_arg),
896 cmd->
897 flags &
898 TRIG_ROUND_MASK);
899 if (tmp_arg != cmd->scan_begin_arg)
900 err++;
901 }
902 }
903 }
904
905 if (err)
906 return 4;
907
908 /* make sure user is not trying to mix unipolar and bipolar ranges */
909 if (cmd->chanlist) {
910 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
911 for (i = 1; i < cmd->chanlist_len; i++) {
912 if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
913 comedi_error(dev,
914 "unipolar and bipolar ranges cannot be mixed in the chanlist");
915 err++;
916 break;
917 }
918 }
919 }
920
921 if (err)
922 return 5;
923
924 return 0;
925 }
926
927 /* returns appropriate bits for control register a, depending on command */
928 static int control_a_bits(const struct comedi_cmd *cmd)
929 {
930 int control_a;
931
932 control_a = FFEN; /* enable fifo */
933 if (cmd->stop_src == TRIG_EXT)
934 control_a |= ATEN;
935 switch (cmd->start_src) {
936 case TRIG_EXT:
937 control_a |= TGEN | CGSL;
938 break;
939 case TRIG_NOW:
940 control_a |= CGEN;
941 break;
942 default:
943 break;
944 }
945
946 return control_a;
947 }
948
949 /* returns appropriate bits for control register c, depending on command */
950 static int control_c_bits(const struct comedi_cmd *cmd)
951 {
952 int control_c;
953 int aref;
954
955 /* set clock source to internal or external, select analog reference,
956 * select unipolar / bipolar
957 */
958 aref = CR_AREF(cmd->chanlist[0]);
959 control_c = UQEN; /* enable upper qram addresses */
960 if (aref != AREF_DIFF)
961 control_c |= SD;
962 if (aref == AREF_COMMON)
963 control_c |= CMEN;
964 /* if a unipolar range was selected */
965 if (CR_RANGE(cmd->chanlist[0]) & UNIPOLAR)
966 control_c |= UB;
967 switch (cmd->scan_begin_src) {
968 case TRIG_FOLLOW: /* not in burst mode */
969 switch (cmd->convert_src) {
970 case TRIG_TIMER:
971 /* trig on cascaded counters */
972 control_c |= IPCLK;
973 break;
974 case TRIG_EXT:
975 /* trig on falling edge of external trigger */
976 control_c |= XPCLK;
977 break;
978 default:
979 break;
980 }
981 break;
982 case TRIG_TIMER:
983 /* burst mode with internal pacer clock */
984 control_c |= BMDE | IPCLK;
985 break;
986 case TRIG_EXT:
987 /* burst mode with external trigger */
988 control_c |= BMDE | XPCLK;
989 break;
990 default:
991 break;
992 }
993
994 return control_c;
995 }
996
997 /* loads counters with divisor1, divisor2 from private structure */
998 static int das1800_set_frequency(struct comedi_device *dev)
999 {
1000 struct das1800_private *devpriv = dev->private;
1001 int err = 0;
1002
1003 /* counter 1, mode 2 */
1004 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
1005 2))
1006 err++;
1007 /* counter 2, mode 2 */
1008 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
1009 2))
1010 err++;
1011 if (err)
1012 return -1;
1013
1014 return 0;
1015 }
1016
1017 /* sets up counters */
1018 static int setup_counters(struct comedi_device *dev,
1019 const struct comedi_cmd *cmd)
1020 {
1021 struct das1800_private *devpriv = dev->private;
1022 unsigned int period;
1023
1024 /* setup cascaded counters for conversion/scan frequency */
1025 switch (cmd->scan_begin_src) {
1026 case TRIG_FOLLOW: /* not in burst mode */
1027 if (cmd->convert_src == TRIG_TIMER) {
1028 /* set conversion frequency */
1029 period = cmd->convert_arg;
1030 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1031 &devpriv->divisor1,
1032 &devpriv->divisor2,
1033 &period,
1034 cmd->flags &
1035 TRIG_ROUND_MASK);
1036 if (das1800_set_frequency(dev) < 0)
1037 return -1;
1038 }
1039 break;
1040 case TRIG_TIMER: /* in burst mode */
1041 /* set scan frequency */
1042 period = cmd->scan_begin_arg;
1043 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &devpriv->divisor1,
1044 &devpriv->divisor2, &period,
1045 cmd->flags & TRIG_ROUND_MASK);
1046 if (das1800_set_frequency(dev) < 0)
1047 return -1;
1048 break;
1049 default:
1050 break;
1051 }
1052
1053 /* setup counter 0 for 'about triggering' */
1054 if (cmd->stop_src == TRIG_EXT) {
1055 /* load counter 0 in mode 0 */
1056 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1057 }
1058
1059 return 0;
1060 }
1061
1062 /* utility function that suggests a dma transfer size based on the conversion period 'ns' */
1063 static unsigned int suggest_transfer_size(const struct comedi_cmd *cmd)
1064 {
1065 unsigned int size = DMA_BUF_SIZE;
1066 static const int sample_size = 2; /* size in bytes of one sample from board */
1067 unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */
1068 unsigned int max_size; /* maximum size we will allow for a transfer */
1069
1070 /* make dma buffer fill in 0.3 seconds for timed modes */
1071 switch (cmd->scan_begin_src) {
1072 case TRIG_FOLLOW: /* not in burst mode */
1073 if (cmd->convert_src == TRIG_TIMER)
1074 size = (fill_time / cmd->convert_arg) * sample_size;
1075 break;
1076 case TRIG_TIMER:
1077 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
1078 sample_size;
1079 break;
1080 default:
1081 size = DMA_BUF_SIZE;
1082 break;
1083 }
1084
1085 /* set a minimum and maximum size allowed */
1086 max_size = DMA_BUF_SIZE;
1087 /* if we are taking limited number of conversions, limit transfer size to that */
1088 if (cmd->stop_src == TRIG_COUNT &&
1089 cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
1090 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1091
1092 if (size > max_size)
1093 size = max_size;
1094 if (size < sample_size)
1095 size = sample_size;
1096
1097 return size;
1098 }
1099
1100 /* sets up dma */
1101 static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd)
1102 {
1103 struct das1800_private *devpriv = dev->private;
1104 unsigned long lock_flags;
1105 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1106
1107 if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1108 return;
1109
1110 /* determine a reasonable dma transfer size */
1111 devpriv->dma_transfer_size = suggest_transfer_size(cmd);
1112 lock_flags = claim_dma_lock();
1113 disable_dma(devpriv->dma0);
1114 /* clear flip-flop to make sure 2-byte registers for
1115 * count and address get set correctly */
1116 clear_dma_ff(devpriv->dma0);
1117 set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
1118 /* set appropriate size of transfer */
1119 set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1120 devpriv->dma_current = devpriv->dma0;
1121 devpriv->dma_current_buf = devpriv->ai_buf0;
1122 enable_dma(devpriv->dma0);
1123 /* set up dual dma if appropriate */
1124 if (dual_dma) {
1125 disable_dma(devpriv->dma1);
1126 /* clear flip-flop to make sure 2-byte registers for
1127 * count and address get set correctly */
1128 clear_dma_ff(devpriv->dma1);
1129 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
1130 /* set appropriate size of transfer */
1131 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1132 enable_dma(devpriv->dma1);
1133 }
1134 release_dma_lock(lock_flags);
1135
1136 return;
1137 }
1138
1139 /* programs channel/gain list into card */
1140 static void program_chanlist(struct comedi_device *dev,
1141 const struct comedi_cmd *cmd)
1142 {
1143 int i, n, chan_range;
1144 unsigned long irq_flags;
1145 const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */
1146 const int range_bitshift = 8;
1147
1148 n = cmd->chanlist_len;
1149 /* spinlock protects indirect addressing */
1150 spin_lock_irqsave(&dev->spinlock, irq_flags);
1151 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1152 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */
1153 /* make channel / gain list */
1154 for (i = 0; i < n; i++) {
1155 chan_range =
1156 CR_CHAN(cmd->chanlist[i]) |
1157 ((CR_RANGE(cmd->chanlist[i]) & range_mask) <<
1158 range_bitshift);
1159 outw(chan_range, dev->iobase + DAS1800_QRAM);
1160 }
1161 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1162 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1163
1164 return;
1165 }
1166
1167 /* analog input do_cmd */
1168 static int das1800_ai_do_cmd(struct comedi_device *dev,
1169 struct comedi_subdevice *s)
1170 {
1171 struct das1800_private *devpriv = dev->private;
1172 int ret;
1173 int control_a, control_c;
1174 struct comedi_async *async = s->async;
1175 const struct comedi_cmd *cmd = &async->cmd;
1176
1177 if (!dev->irq) {
1178 comedi_error(dev,
1179 "no irq assigned for das-1800, cannot do hardware conversions");
1180 return -1;
1181 }
1182
1183 /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1184 * (because dma in handler is unsafe at hard real-time priority) */
1185 if (cmd->flags & (TRIG_WAKE_EOS | TRIG_RT))
1186 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1187 else
1188 devpriv->irq_dma_bits |= devpriv->dma_bits;
1189 /* interrupt on end of conversion for TRIG_WAKE_EOS */
1190 if (cmd->flags & TRIG_WAKE_EOS) {
1191 /* interrupt fifo not empty */
1192 devpriv->irq_dma_bits &= ~FIMD;
1193 } else {
1194 /* interrupt fifo half full */
1195 devpriv->irq_dma_bits |= FIMD;
1196 }
1197 /* determine how many conversions we need */
1198 if (cmd->stop_src == TRIG_COUNT)
1199 devpriv->count = cmd->stop_arg * cmd->chanlist_len;
1200
1201 das1800_cancel(dev, s);
1202
1203 /* determine proper bits for control registers */
1204 control_a = control_a_bits(cmd);
1205 control_c = control_c_bits(cmd);
1206
1207 /* setup card and start */
1208 program_chanlist(dev, cmd);
1209 ret = setup_counters(dev, cmd);
1210 if (ret < 0) {
1211 comedi_error(dev, "Error setting up counters");
1212 return ret;
1213 }
1214 setup_dma(dev, cmd);
1215 outb(control_c, dev->iobase + DAS1800_CONTROL_C);
1216 /* set conversion rate and length for burst mode */
1217 if (control_c & BMDE) {
1218 /* program conversion period with number of microseconds minus 1 */
1219 outb(cmd->convert_arg / 1000 - 1,
1220 dev->iobase + DAS1800_BURST_RATE);
1221 outb(cmd->chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1222 }
1223 outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */
1224 outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */
1225 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1226
1227 return 0;
1228 }
1229
1230 /* read analog input */
1231 static int das1800_ai_rinsn(struct comedi_device *dev,
1232 struct comedi_subdevice *s,
1233 struct comedi_insn *insn, unsigned int *data)
1234 {
1235 int i, n;
1236 int chan, range, aref, chan_range;
1237 int timeout = 1000;
1238 short dpnt;
1239 int conv_flags = 0;
1240 unsigned long irq_flags;
1241
1242 /* set up analog reference and unipolar / bipolar mode */
1243 aref = CR_AREF(insn->chanspec);
1244 conv_flags |= UQEN;
1245 if (aref != AREF_DIFF)
1246 conv_flags |= SD;
1247 if (aref == AREF_COMMON)
1248 conv_flags |= CMEN;
1249 /* if a unipolar range was selected */
1250 if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1251 conv_flags |= UB;
1252
1253 outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */
1254 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1255 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */
1256 outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1257
1258 chan = CR_CHAN(insn->chanspec);
1259 /* mask of unipolar/bipolar bit from range */
1260 range = CR_RANGE(insn->chanspec) & 0x3;
1261 chan_range = chan | (range << 8);
1262 spin_lock_irqsave(&dev->spinlock, irq_flags);
1263 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1264 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */
1265 outw(chan_range, dev->iobase + DAS1800_QRAM);
1266 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1267 outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */
1268
1269 for (n = 0; n < insn->n; n++) {
1270 /* trigger conversion */
1271 outb(0, dev->iobase + DAS1800_FIFO);
1272 for (i = 0; i < timeout; i++) {
1273 if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1274 break;
1275 }
1276 if (i == timeout) {
1277 comedi_error(dev, "timeout");
1278 n = -ETIME;
1279 goto exit;
1280 }
1281 dpnt = inw(dev->iobase + DAS1800_FIFO);
1282 /* shift data to offset binary for bipolar ranges */
1283 if ((conv_flags & UB) == 0)
1284 dpnt += 1 << (thisboard->resolution - 1);
1285 data[n] = dpnt;
1286 }
1287 exit:
1288 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1289
1290 return n;
1291 }
1292
1293 /* writes to an analog output channel */
1294 static int das1800_ao_winsn(struct comedi_device *dev,
1295 struct comedi_subdevice *s,
1296 struct comedi_insn *insn, unsigned int *data)
1297 {
1298 struct das1800_private *devpriv = dev->private;
1299 int chan = CR_CHAN(insn->chanspec);
1300 /* int range = CR_RANGE(insn->chanspec); */
1301 int update_chan = thisboard->ao_n_chan - 1;
1302 short output;
1303 unsigned long irq_flags;
1304
1305 /* card expects two's complement data */
1306 output = data[0] - (1 << (thisboard->resolution - 1));
1307 /* if the write is to the 'update' channel, we need to remember its value */
1308 if (chan == update_chan)
1309 devpriv->ao_update_bits = output;
1310 /* write to channel */
1311 spin_lock_irqsave(&dev->spinlock, irq_flags);
1312 outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */
1313 outw(output, dev->iobase + DAS1800_DAC);
1314 /* now we need to write to 'update' channel to update all dac channels */
1315 if (chan != update_chan) {
1316 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */
1317 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1318 }
1319 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1320
1321 return 1;
1322 }
1323
1324 /* reads from digital input channels */
1325 static int das1800_di_rbits(struct comedi_device *dev,
1326 struct comedi_subdevice *s,
1327 struct comedi_insn *insn, unsigned int *data)
1328 {
1329
1330 data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1331 data[0] = 0;
1332
1333 return insn->n;
1334 }
1335
1336 /* writes to digital output channels */
1337 static int das1800_do_wbits(struct comedi_device *dev,
1338 struct comedi_subdevice *s,
1339 struct comedi_insn *insn, unsigned int *data)
1340 {
1341 struct das1800_private *devpriv = dev->private;
1342 unsigned int wbits;
1343
1344 /* only set bits that have been masked */
1345 data[0] &= (1 << s->n_chan) - 1;
1346 wbits = devpriv->do_bits;
1347 wbits &= ~data[0];
1348 wbits |= data[0] & data[1];
1349 devpriv->do_bits = wbits;
1350
1351 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1352
1353 data[1] = devpriv->do_bits;
1354
1355 return insn->n;
1356 }
1357
1358 static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
1359 unsigned int dma1)
1360 {
1361 struct das1800_private *devpriv = dev->private;
1362 unsigned long flags;
1363
1364 /* need an irq to do dma */
1365 if (dev->irq && dma0) {
1366 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
1367 switch ((dma0 & 0x7) | (dma1 << 4)) {
1368 case 0x5: /* dma0 == 5 */
1369 devpriv->dma_bits |= DMA_CH5;
1370 break;
1371 case 0x6: /* dma0 == 6 */
1372 devpriv->dma_bits |= DMA_CH6;
1373 break;
1374 case 0x7: /* dma0 == 7 */
1375 devpriv->dma_bits |= DMA_CH7;
1376 break;
1377 case 0x65: /* dma0 == 5, dma1 == 6 */
1378 devpriv->dma_bits |= DMA_CH5_CH6;
1379 break;
1380 case 0x76: /* dma0 == 6, dma1 == 7 */
1381 devpriv->dma_bits |= DMA_CH6_CH7;
1382 break;
1383 case 0x57: /* dma0 == 7, dma1 == 5 */
1384 devpriv->dma_bits |= DMA_CH7_CH5;
1385 break;
1386 default:
1387 dev_err(dev->class_dev,
1388 "only supports dma channels 5 through 7\n");
1389 dev_err(dev->class_dev,
1390 "Dual dma only allows the following combinations:\n");
1391 dev_err(dev->class_dev,
1392 "dma 5,6 / 6,7 / or 7,5\n");
1393 return -EINVAL;
1394 break;
1395 }
1396 if (request_dma(dma0, dev->driver->driver_name)) {
1397 dev_err(dev->class_dev,
1398 "failed to allocate dma channel %i\n", dma0);
1399 return -EINVAL;
1400 }
1401 devpriv->dma0 = dma0;
1402 devpriv->dma_current = dma0;
1403 if (dma1) {
1404 if (request_dma(dma1, dev->driver->driver_name)) {
1405 dev_err(dev->class_dev,
1406 "failed to allocate dma channel %i\n",
1407 dma1);
1408 return -EINVAL;
1409 }
1410 devpriv->dma1 = dma1;
1411 }
1412 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1413 if (devpriv->ai_buf0 == NULL)
1414 return -ENOMEM;
1415 devpriv->dma_current_buf = devpriv->ai_buf0;
1416 if (dma1) {
1417 devpriv->ai_buf1 =
1418 kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1419 if (devpriv->ai_buf1 == NULL)
1420 return -ENOMEM;
1421 }
1422 flags = claim_dma_lock();
1423 disable_dma(devpriv->dma0);
1424 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
1425 if (dma1) {
1426 disable_dma(devpriv->dma1);
1427 set_dma_mode(devpriv->dma1, DMA_MODE_READ);
1428 }
1429 release_dma_lock(flags);
1430 }
1431 return 0;
1432 }
1433
1434 static int das1800_probe(struct comedi_device *dev)
1435 {
1436 int id;
1437 int board;
1438
1439 id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */
1440 board = ((struct das1800_board *)dev->board_ptr) - das1800_boards;
1441
1442 switch (id) {
1443 case 0x3:
1444 if (board == das1801st_da || board == das1802st_da ||
1445 board == das1701st_da || board == das1702st_da) {
1446 dev_dbg(dev->class_dev, "Board model: %s\n",
1447 das1800_boards[board].name);
1448 return board;
1449 }
1450 printk
1451 (" Board model (probed, not recommended): das-1800st-da series\n");
1452 return das1801st;
1453 break;
1454 case 0x4:
1455 if (board == das1802hr_da || board == das1702hr_da) {
1456 dev_dbg(dev->class_dev, "Board model: %s\n",
1457 das1800_boards[board].name);
1458 return board;
1459 }
1460 printk
1461 (" Board model (probed, not recommended): das-1802hr-da\n");
1462 return das1802hr;
1463 break;
1464 case 0x5:
1465 if (board == das1801ao || board == das1802ao ||
1466 board == das1701ao || board == das1702ao) {
1467 dev_dbg(dev->class_dev, "Board model: %s\n",
1468 das1800_boards[board].name);
1469 return board;
1470 }
1471 printk
1472 (" Board model (probed, not recommended): das-1800ao series\n");
1473 return das1801ao;
1474 break;
1475 case 0x6:
1476 if (board == das1802hr || board == das1702hr) {
1477 dev_dbg(dev->class_dev, "Board model: %s\n",
1478 das1800_boards[board].name);
1479 return board;
1480 }
1481 printk
1482 (" Board model (probed, not recommended): das-1802hr\n");
1483 return das1802hr;
1484 break;
1485 case 0x7:
1486 if (board == das1801st || board == das1802st ||
1487 board == das1701st || board == das1702st) {
1488 dev_dbg(dev->class_dev, "Board model: %s\n",
1489 das1800_boards[board].name);
1490 return board;
1491 }
1492 printk
1493 (" Board model (probed, not recommended): das-1800st series\n");
1494 return das1801st;
1495 break;
1496 case 0x8:
1497 if (board == das1801hc || board == das1802hc) {
1498 dev_dbg(dev->class_dev, "Board model: %s\n",
1499 das1800_boards[board].name);
1500 return board;
1501 }
1502 printk
1503 (" Board model (probed, not recommended): das-1800hc series\n");
1504 return das1801hc;
1505 break;
1506 default:
1507 printk
1508 (" Board model: probe returned 0x%x (unknown, please report)\n",
1509 id);
1510 return board;
1511 break;
1512 }
1513 return -1;
1514 }
1515
1516 static int das1800_attach(struct comedi_device *dev,
1517 struct comedi_devconfig *it)
1518 {
1519 struct das1800_private *devpriv;
1520 struct comedi_subdevice *s;
1521 unsigned long iobase = it->options[0];
1522 unsigned int irq = it->options[1];
1523 unsigned int dma0 = it->options[2];
1524 unsigned int dma1 = it->options[3];
1525 unsigned long iobase2;
1526 int board;
1527 int retval;
1528
1529 devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
1530 if (!devpriv)
1531 return -ENOMEM;
1532 dev->private = devpriv;
1533
1534 printk(KERN_DEBUG "comedi%d: %s: io 0x%lx", dev->minor,
1535 dev->driver->driver_name, iobase);
1536 if (irq) {
1537 printk(KERN_CONT ", irq %u", irq);
1538 if (dma0) {
1539 printk(KERN_CONT ", dma %u", dma0);
1540 if (dma1)
1541 printk(KERN_CONT " and %u", dma1);
1542 }
1543 }
1544 printk(KERN_CONT "\n");
1545
1546 if (iobase == 0) {
1547 dev_err(dev->class_dev, "io base address required\n");
1548 return -EINVAL;
1549 }
1550
1551 /* check if io addresses are available */
1552 if (!request_region(iobase, DAS1800_SIZE, dev->driver->driver_name)) {
1553 printk
1554 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
1555 iobase, iobase + DAS1800_SIZE - 1);
1556 return -EIO;
1557 }
1558 dev->iobase = iobase;
1559
1560 board = das1800_probe(dev);
1561 if (board < 0) {
1562 dev_err(dev->class_dev, "unable to determine board type\n");
1563 return -ENODEV;
1564 }
1565
1566 dev->board_ptr = das1800_boards + board;
1567 dev->board_name = thisboard->name;
1568
1569 /* if it is an 'ao' board with fancy analog out then we need extra io ports */
1570 if (thisboard->ao_ability == 2) {
1571 iobase2 = iobase + IOBASE2;
1572 if (!request_region(iobase2, DAS1800_SIZE,
1573 dev->driver->driver_name)) {
1574 printk
1575 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
1576 iobase2, iobase2 + DAS1800_SIZE - 1);
1577 return -EIO;
1578 }
1579 devpriv->iobase2 = iobase2;
1580 }
1581
1582 /* grab our IRQ */
1583 if (irq) {
1584 if (request_irq(irq, das1800_interrupt, 0,
1585 dev->driver->driver_name, dev)) {
1586 dev_dbg(dev->class_dev, "unable to allocate irq %u\n",
1587 irq);
1588 return -EINVAL;
1589 }
1590 }
1591 dev->irq = irq;
1592
1593 /* set bits that tell card which irq to use */
1594 switch (irq) {
1595 case 0:
1596 break;
1597 case 3:
1598 devpriv->irq_dma_bits |= 0x8;
1599 break;
1600 case 5:
1601 devpriv->irq_dma_bits |= 0x10;
1602 break;
1603 case 7:
1604 devpriv->irq_dma_bits |= 0x18;
1605 break;
1606 case 10:
1607 devpriv->irq_dma_bits |= 0x28;
1608 break;
1609 case 11:
1610 devpriv->irq_dma_bits |= 0x30;
1611 break;
1612 case 15:
1613 devpriv->irq_dma_bits |= 0x38;
1614 break;
1615 default:
1616 dev_err(dev->class_dev, "irq out of range\n");
1617 return -EINVAL;
1618 break;
1619 }
1620
1621 retval = das1800_init_dma(dev, dma0, dma1);
1622 if (retval < 0)
1623 return retval;
1624
1625 if (devpriv->ai_buf0 == NULL) {
1626 devpriv->ai_buf0 =
1627 kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
1628 if (devpriv->ai_buf0 == NULL)
1629 return -ENOMEM;
1630 }
1631
1632 retval = comedi_alloc_subdevices(dev, 4);
1633 if (retval)
1634 return retval;
1635
1636 /* analog input subdevice */
1637 s = &dev->subdevices[0];
1638 dev->read_subdev = s;
1639 s->type = COMEDI_SUBD_AI;
1640 s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
1641 if (thisboard->common)
1642 s->subdev_flags |= SDF_COMMON;
1643 s->n_chan = thisboard->qram_len;
1644 s->len_chanlist = thisboard->qram_len;
1645 s->maxdata = (1 << thisboard->resolution) - 1;
1646 s->range_table = thisboard->range_ai;
1647 s->do_cmd = das1800_ai_do_cmd;
1648 s->do_cmdtest = das1800_ai_do_cmdtest;
1649 s->insn_read = das1800_ai_rinsn;
1650 s->poll = das1800_ai_poll;
1651 s->cancel = das1800_cancel;
1652
1653 /* analog out */
1654 s = &dev->subdevices[1];
1655 if (thisboard->ao_ability == 1) {
1656 s->type = COMEDI_SUBD_AO;
1657 s->subdev_flags = SDF_WRITABLE;
1658 s->n_chan = thisboard->ao_n_chan;
1659 s->maxdata = (1 << thisboard->resolution) - 1;
1660 s->range_table = &range_ao_1;
1661 s->insn_write = das1800_ao_winsn;
1662 } else {
1663 s->type = COMEDI_SUBD_UNUSED;
1664 }
1665
1666 /* di */
1667 s = &dev->subdevices[2];
1668 s->type = COMEDI_SUBD_DI;
1669 s->subdev_flags = SDF_READABLE;
1670 s->n_chan = 4;
1671 s->maxdata = 1;
1672 s->range_table = &range_digital;
1673 s->insn_bits = das1800_di_rbits;
1674
1675 /* do */
1676 s = &dev->subdevices[3];
1677 s->type = COMEDI_SUBD_DO;
1678 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
1679 s->n_chan = thisboard->do_n_chan;
1680 s->maxdata = 1;
1681 s->range_table = &range_digital;
1682 s->insn_bits = das1800_do_wbits;
1683
1684 das1800_cancel(dev, dev->read_subdev);
1685
1686 /* initialize digital out channels */
1687 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1688
1689 /* initialize analog out channels */
1690 if (thisboard->ao_ability == 1) {
1691 /* select 'update' dac channel for baseAddress + 0x0 */
1692 outb(DAC(thisboard->ao_n_chan - 1),
1693 dev->iobase + DAS1800_SELECT);
1694 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1695 }
1696
1697 return 0;
1698 };
1699
1700 static void das1800_detach(struct comedi_device *dev)
1701 {
1702 struct das1800_private *devpriv = dev->private;
1703
1704 if (dev->iobase)
1705 release_region(dev->iobase, DAS1800_SIZE);
1706 if (dev->irq)
1707 free_irq(dev->irq, dev);
1708 if (devpriv) {
1709 if (devpriv->iobase2)
1710 release_region(devpriv->iobase2, DAS1800_SIZE);
1711 if (devpriv->dma0)
1712 free_dma(devpriv->dma0);
1713 if (devpriv->dma1)
1714 free_dma(devpriv->dma1);
1715 kfree(devpriv->ai_buf0);
1716 kfree(devpriv->ai_buf1);
1717 }
1718 };
1719
1720 static struct comedi_driver das1800_driver = {
1721 .driver_name = "das1800",
1722 .module = THIS_MODULE,
1723 .attach = das1800_attach,
1724 .detach = das1800_detach,
1725 .num_names = ARRAY_SIZE(das1800_boards),
1726 .board_name = &das1800_boards[0].name,
1727 .offset = sizeof(struct das1800_board),
1728 };
1729 module_comedi_driver(das1800_driver);
1730
1731 MODULE_AUTHOR("Comedi http://www.comedi.org");
1732 MODULE_DESCRIPTION("Comedi low-level driver");
1733 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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