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a69cc3a9
FMH		 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/*
26Driver: das1800
27Description: Keithley Metrabyte DAS1800 (& compatibles)
28Author: Frank Mori Hess <fmhess@users.sourceforge.net>
29Devices: [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)
39Status: works
40
41The waveform analog output on the 'ao' cards is not supported.
42If you need it, send me (Frank Hess) an email.
43
44Configuration 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
52This driver supports the following Keithley boards:
53
54das-1701st
55das-1701st-da
56das-1701ao
57das-1702st
58das-1702st-da
59das-1702hr
60das-1702hr-da
61das-1702ao
62das-1801st
63das-1801st-da
64das-1801hc
65das-1801ao
66das-1802st
67das-1802st-da
68das-1802hr
69das-1802hr-da
70das-1802hc
71das-1802ao
72
73Options:
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
79irq can be omitted, although the cmd interface will not work without it.
80
81analog 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
88scan_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
91is TRIG_FOLLOW.
92
93NOTES:
94Only the DAS-1801ST has been tested by me.
95Unipolar and bipolar ranges cannot be mixed in the channel/gain list.
96
97TODO:
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
25436dc9 103#include <linux/interrupt.h>
5a0e3ad6 104#include <linux/slab.h>
a69cc3a9
FMH		 105#include "../comedidev.h"
106
107#include <linux/ioport.h>
108#include <asm/dma.h>
109
110#include "8253.h"
111#include "comedi_fc.h"
112
a351ecf3
BP		 113/* misc. defines */
114#define DAS1800_SIZE 16 /* uses 16 io addresses */
115#define FIFO_SIZE 1024 /* 1024 sample fifo */
116#define TIMER_BASE 200 /* 5 Mhz master clock */
117#define UNIPOLAR 0x4 /* bit that determines whether input range is uni/bipolar */
118#define DMA_BUF_SIZE 0x1ff00 /* size in bytes of dma buffers */
a69cc3a9
FMH		 119
120/* Registers for the das1800 */
121#define DAS1800_FIFO 0x0
122#define DAS1800_QRAM 0x0
123#define DAS1800_DAC 0x0
124#define DAS1800_SELECT 0x2
125#define ADC 0x0
126#define QRAM 0x1
127#define DAC(a) (0x2 + a)
128#define DAS1800_DIGITAL 0x3
129#define DAS1800_CONTROL_A 0x4
130#define FFEN 0x1
131#define CGEN 0x4
132#define CGSL 0x8
133#define TGEN 0x10
134#define TGSL 0x20
135#define ATEN 0x80
136#define DAS1800_CONTROL_B 0x5
137#define DMA_CH5 0x1
138#define DMA_CH6 0x2
139#define DMA_CH7 0x3
140#define DMA_CH5_CH6 0x5
141#define DMA_CH6_CH7 0x6
142#define DMA_CH7_CH5 0x7
a351ecf3 143#define DMA_ENABLED 0x3 /* mask used to determine if dma is enabled */
a69cc3a9
FMH		 144#define DMA_DUAL 0x4
145#define IRQ3 0x8
146#define IRQ5 0x10
147#define IRQ7 0x18
148#define IRQ10 0x28
149#define IRQ11 0x30
150#define IRQ15 0x38
151#define FIMD 0x40
152#define DAS1800_CONTROL_C 0X6
153#define IPCLK 0x1
154#define XPCLK 0x3
155#define BMDE 0x4
156#define CMEN 0x8
157#define UQEN 0x10
158#define SD 0x40
159#define UB 0x80
160#define DAS1800_STATUS 0x7
a351ecf3 161/* bits that prevent interrupt status bits (and CVEN) from being cleared on write */
a69cc3a9
FMH		 162#define CLEAR_INTR_MASK (CVEN_MASK | 0x1f)
163#define INT 0x1
164#define DMATC 0x2
165#define CT0TC 0x8
166#define OVF 0x10
167#define FHF 0x20
168#define FNE 0x40
a351ecf3 169#define CVEN_MASK 0x40 /* masks CVEN on write */
a69cc3a9
FMH		 170#define CVEN 0x80
171#define DAS1800_BURST_LENGTH 0x8
172#define DAS1800_BURST_RATE 0x9
173#define DAS1800_QRAM_ADDRESS 0xa
174#define DAS1800_COUNTER 0xc
175
a351ecf3 176#define IOBASE2 0x400 /* offset of additional ioports used on 'ao' cards */
a69cc3a9
FMH		 177
178enum {
179 das1701st, das1701st_da, das1702st, das1702st_da, das1702hr,
180 das1702hr_da,
181 das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da,
182 das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao
183};
184
0a85b6f0
MT		 185static int das1800_attach(struct comedi_device *dev,
186 struct comedi_devconfig *it);
814900c9
BP		 187static int das1800_detach(struct comedi_device *dev);
188static int das1800_probe(struct comedi_device *dev);
0a85b6f0
MT		 189static int das1800_cancel(struct comedi_device *dev,
190 struct comedi_subdevice *s);
70265d24 191static irqreturn_t das1800_interrupt(int irq, void *d);
0a85b6f0
MT		 192static int das1800_ai_poll(struct comedi_device *dev,
193 struct comedi_subdevice *s);
814900c9 194static void das1800_ai_handler(struct comedi_device *dev);
0a85b6f0
MT		 195static void das1800_handle_dma(struct comedi_device *dev,
196 struct comedi_subdevice *s, unsigned int status);
197static void das1800_flush_dma(struct comedi_device *dev,
198 struct comedi_subdevice *s);
199static void das1800_flush_dma_channel(struct comedi_device *dev,
200 struct comedi_subdevice *s,
201 unsigned int channel, uint16_t * buffer);
814900c9 202static void das1800_handle_fifo_half_full(struct comedi_device *dev,
0a85b6f0 203 struct comedi_subdevice *s);
814900c9 204static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
0a85b6f0
MT		 205 struct comedi_subdevice *s);
206static int das1800_ai_do_cmdtest(struct comedi_device *dev,
207 struct comedi_subdevice *s,
208 struct comedi_cmd *cmd);
209static int das1800_ai_do_cmd(struct comedi_device *dev,
210 struct comedi_subdevice *s);
211static int das1800_ai_rinsn(struct comedi_device *dev,
212 struct comedi_subdevice *s,
213 struct comedi_insn *insn, unsigned int *data);
214static int das1800_ao_winsn(struct comedi_device *dev,
215 struct comedi_subdevice *s,
216 struct comedi_insn *insn, unsigned int *data);
217static int das1800_di_rbits(struct comedi_device *dev,
218 struct comedi_subdevice *s,
219 struct comedi_insn *insn, unsigned int *data);
220static int das1800_do_wbits(struct comedi_device *dev,
221 struct comedi_subdevice *s,
222 struct comedi_insn *insn, unsigned int *data);
814900c9
BP		 223
224static int das1800_set_frequency(struct comedi_device *dev);
a69cc3a9 225static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode);
814900c9 226static unsigned int suggest_transfer_size(struct comedi_cmd *cmd);
a69cc3a9 227
a351ecf3 228/* analog input ranges */
9ced1de6 229static const struct comedi_lrange range_ai_das1801 = {
a69cc3a9
FMH		 230 8,
231 {
0a85b6f0
MT		 232 RANGE(-5, 5),
233 RANGE(-1, 1),
234 RANGE(-0.1, 0.1),
235 RANGE(-0.02, 0.02),
236 RANGE(0, 5),
237 RANGE(0, 1),
238 RANGE(0, 0.1),
239 RANGE(0, 0.02),
240 }
a69cc3a9
FMH		 241};
242
9ced1de6 243static const struct comedi_lrange range_ai_das1802 = {
a69cc3a9
FMH		 244 8,
245 {
0a85b6f0
MT		 246 RANGE(-10, 10),
247 RANGE(-5, 5),
248 RANGE(-2.5, 2.5),
249 RANGE(-1.25, 1.25),
250 RANGE(0, 10),
251 RANGE(0, 5),
252 RANGE(0, 2.5),
253 RANGE(0, 1.25),
254 }
a69cc3a9
FMH		 255};
256
ce422cf3 257struct das1800_board {
a69cc3a9
FMH		 258 const char *name;
259 int ai_speed; /* max conversion period in nanoseconds */
260 int resolution; /* bits of ai resolution */
261 int qram_len; /* length of card's channel / gain queue */
262 int common; /* supports AREF_COMMON flag */
263 int do_n_chan; /* number of digital output channels */
264 int ao_ability; /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */
265 int ao_n_chan; /* number of analog out channels */
9ced1de6 266 const struct comedi_lrange *range_ai; /* available input ranges */
ce422cf3 267};
a69cc3a9
FMH		 268
269/* Warning: the maximum conversion speeds listed below are
270 * not always achievable depending on board setup (see
271 * user manual.)
272 */
ce422cf3 273static const struct das1800_board das1800_boards[] = {
a69cc3a9 274 {
0a85b6f0
MT		 275 .name = "das-1701st",
276 .ai_speed = 6250,
277 .resolution = 12,
278 .qram_len = 256,
279 .common = 1,
280 .do_n_chan = 4,
281 .ao_ability = 0,
282 .ao_n_chan = 0,
283 .range_ai = &range_ai_das1801,
284 },
a69cc3a9 285 {
0a85b6f0
MT		 286 .name = "das-1701st-da",
287 .ai_speed = 6250,
288 .resolution = 12,
289 .qram_len = 256,
290 .common = 1,
291 .do_n_chan = 4,
292 .ao_ability = 1,
293 .ao_n_chan = 4,
294 .range_ai = &range_ai_das1801,
295 },
a69cc3a9 296 {
0a85b6f0
MT		 297 .name = "das-1702st",
298 .ai_speed = 6250,
299 .resolution = 12,
300 .qram_len = 256,
301 .common = 1,
302 .do_n_chan = 4,
303 .ao_ability = 0,
304 .ao_n_chan = 0,
305 .range_ai = &range_ai_das1802,
306 },
a69cc3a9 307 {
0a85b6f0
MT		 308 .name = "das-1702st-da",
309 .ai_speed = 6250,
310 .resolution = 12,
311 .qram_len = 256,
312 .common = 1,
313 .do_n_chan = 4,
314 .ao_ability = 1,
315 .ao_n_chan = 4,
316 .range_ai = &range_ai_das1802,
317 },
a69cc3a9 318 {
0a85b6f0
MT		 319 .name = "das-1702hr",
320 .ai_speed = 20000,
321 .resolution = 16,
322 .qram_len = 256,
323 .common = 1,
324 .do_n_chan = 4,
325 .ao_ability = 0,
326 .ao_n_chan = 0,
327 .range_ai = &range_ai_das1802,
328 },
a69cc3a9 329 {
0a85b6f0
MT		 330 .name = "das-1702hr-da",
331 .ai_speed = 20000,
332 .resolution = 16,
333 .qram_len = 256,
334 .common = 1,
335 .do_n_chan = 4,
336 .ao_ability = 1,
337 .ao_n_chan = 2,
338 .range_ai = &range_ai_das1802,
339 },
a69cc3a9 340 {
0a85b6f0
MT		 341 .name = "das-1701ao",
342 .ai_speed = 6250,
343 .resolution = 12,
344 .qram_len = 256,
345 .common = 1,
346 .do_n_chan = 4,
347 .ao_ability = 2,
348 .ao_n_chan = 2,
349 .range_ai = &range_ai_das1801,
350 },
a69cc3a9 351 {
0a85b6f0
MT		 352 .name = "das-1702ao",
353 .ai_speed = 6250,
354 .resolution = 12,
355 .qram_len = 256,
356 .common = 1,
357 .do_n_chan = 4,
358 .ao_ability = 2,
359 .ao_n_chan = 2,
360 .range_ai = &range_ai_das1802,
361 },
a69cc3a9 362 {
0a85b6f0
MT		 363 .name = "das-1801st",
364 .ai_speed = 3000,
365 .resolution = 12,
366 .qram_len = 256,
367 .common = 1,
368 .do_n_chan = 4,
369 .ao_ability = 0,
370 .ao_n_chan = 0,
371 .range_ai = &range_ai_das1801,
372 },
a69cc3a9 373 {
0a85b6f0
MT		 374 .name = "das-1801st-da",
375 .ai_speed = 3000,
376 .resolution = 12,
377 .qram_len = 256,
378 .common = 1,
379 .do_n_chan = 4,
380 .ao_ability = 0,
381 .ao_n_chan = 4,
382 .range_ai = &range_ai_das1801,
383 },
a69cc3a9 384 {
0a85b6f0
MT		 385 .name = "das-1802st",
386 .ai_speed = 3000,
387 .resolution = 12,
388 .qram_len = 256,
389 .common = 1,
390 .do_n_chan = 4,
391 .ao_ability = 0,
392 .ao_n_chan = 0,
393 .range_ai = &range_ai_das1802,
394 },
a69cc3a9 395 {
0a85b6f0
MT		 396 .name = "das-1802st-da",
397 .ai_speed = 3000,
398 .resolution = 12,
399 .qram_len = 256,
400 .common = 1,
401 .do_n_chan = 4,
402 .ao_ability = 1,
403 .ao_n_chan = 4,
404 .range_ai = &range_ai_das1802,
405 },
a69cc3a9 406 {
0a85b6f0
MT		 407 .name = "das-1802hr",
408 .ai_speed = 10000,
409 .resolution = 16,
410 .qram_len = 256,
411 .common = 1,
412 .do_n_chan = 4,
413 .ao_ability = 0,
414 .ao_n_chan = 0,
415 .range_ai = &range_ai_das1802,
416 },
a69cc3a9 417 {
0a85b6f0
MT		 418 .name = "das-1802hr-da",
419 .ai_speed = 10000,
420 .resolution = 16,
421 .qram_len = 256,
422 .common = 1,
423 .do_n_chan = 4,
424 .ao_ability = 1,
425 .ao_n_chan = 2,
426 .range_ai = &range_ai_das1802,
427 },
a69cc3a9 428 {
0a85b6f0
MT		 429 .name = "das-1801hc",
430 .ai_speed = 3000,
431 .resolution = 12,
432 .qram_len = 64,
433 .common = 0,
434 .do_n_chan = 8,
435 .ao_ability = 1,
436 .ao_n_chan = 2,
437 .range_ai = &range_ai_das1801,
438 },
a69cc3a9 439 {
0a85b6f0
MT		 440 .name = "das-1802hc",
441 .ai_speed = 3000,
442 .resolution = 12,
443 .qram_len = 64,
444 .common = 0,
445 .do_n_chan = 8,
446 .ao_ability = 1,
447 .ao_n_chan = 2,
448 .range_ai = &range_ai_das1802,
449 },
a69cc3a9 450 {
0a85b6f0
MT		 451 .name = "das-1801ao",
452 .ai_speed = 3000,
453 .resolution = 12,
454 .qram_len = 256,
455 .common = 1,
456 .do_n_chan = 4,
457 .ao_ability = 2,
458 .ao_n_chan = 2,
459 .range_ai = &range_ai_das1801,
460 },
a69cc3a9 461 {
0a85b6f0
MT		 462 .name = "das-1802ao",
463 .ai_speed = 3000,
464 .resolution = 12,
465 .qram_len = 256,
466 .common = 1,
467 .do_n_chan = 4,
468 .ao_ability = 2,
469 .ao_n_chan = 2,
470 .range_ai = &range_ai_das1802,
471 },
a69cc3a9
FMH		 472};
473
474/*
475 * Useful for shorthand access to the particular board structure
476 */
ce422cf3 477#define thisboard ((const struct das1800_board *)dev->board_ptr)
a69cc3a9 478
0c5a144d 479struct das1800_private {
a69cc3a9
FMH		 480 volatile unsigned int count; /* number of data points left to be taken */
481 unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */
482 unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */
483 int do_bits; /* digital output bits */
484 int irq_dma_bits; /* bits for control register b */
485 /* dma bits for control register b, stored so that dma can be
486 * turned on and off */
487 int dma_bits;
488 unsigned int dma0; /* dma channels used */
489 unsigned int dma1;
490 volatile unsigned int dma_current; /* dma channel currently in use */
491 uint16_t *ai_buf0; /* pointers to dma buffers */
492 uint16_t *ai_buf1;
493 uint16_t *dma_current_buf; /* pointer to dma buffer currently being used */
494 unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
495 unsigned long iobase2; /* secondary io address used for analog out on 'ao' boards */
496 short ao_update_bits; /* remembers the last write to the 'update' dac */
0c5a144d 497};
a69cc3a9 498
0c5a144d 499#define devpriv ((struct das1800_private *)dev->private)
a69cc3a9 500
a351ecf3 501/* analog out range for boards with basic analog out */
9ced1de6 502static const struct comedi_lrange range_ao_1 = {
a69cc3a9
FMH		 503 1,
504 {
0a85b6f0
MT		 505 RANGE(-10, 10),
506 }
a69cc3a9
FMH		 507};
508
a351ecf3 509/* analog out range for 'ao' boards */
a69cc3a9 510/*
9ced1de6 511static const struct comedi_lrange range_ao_2 = {
a69cc3a9
FMH		 512 2,
513 {
514 RANGE(-10, 10),
515 RANGE(-5, 5),
516 }
517};
518*/
519
139dfbdf 520static struct comedi_driver driver_das1800 = {
68c3dbff
BP		 521 .driver_name = "das1800",
522 .module = THIS_MODULE,
523 .attach = das1800_attach,
524 .detach = das1800_detach,
8629efa4 525 .num_names = ARRAY_SIZE(das1800_boards),
68c3dbff
BP		 526 .board_name = &das1800_boards[0].name,
527 .offset = sizeof(struct das1800_board),
a69cc3a9
FMH		 528};
529
530/*
531 * A convenient macro that defines init_module() and cleanup_module(),
532 * as necessary.
533 */
7114a280
AT		 534static int __init driver_das1800_init_module(void)
535{
536 return comedi_driver_register(&driver_das1800);
537}
538
539static void __exit driver_das1800_cleanup_module(void)
540{
541 comedi_driver_unregister(&driver_das1800);
542}
543
544module_init(driver_das1800_init_module);
545module_exit(driver_das1800_cleanup_module);
a69cc3a9 546
da91b269 547static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
0a85b6f0 548 unsigned int dma1)
a69cc3a9
FMH		 549{
550 unsigned long flags;
551
a351ecf3 552 /* need an irq to do dma */
a69cc3a9 553 if (dev->irq && dma0) {
a351ecf3 554 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
a69cc3a9 555 switch ((dma0 & 0x7) | (dma1 << 4)) {
a351ecf3 556 case 0x5: /* dma0 == 5 */
a69cc3a9
FMH		 557 devpriv->dma_bits |= DMA_CH5;
558 break;
a351ecf3 559 case 0x6: /* dma0 == 6 */
a69cc3a9
FMH		 560 devpriv->dma_bits |= DMA_CH6;
561 break;
a351ecf3 562 case 0x7: /* dma0 == 7 */
a69cc3a9
FMH		 563 devpriv->dma_bits |= DMA_CH7;
564 break;
a351ecf3 565 case 0x65: /* dma0 == 5, dma1 == 6 */
a69cc3a9
FMH		 566 devpriv->dma_bits |= DMA_CH5_CH6;
567 break;
a351ecf3 568 case 0x76: /* dma0 == 6, dma1 == 7 */
a69cc3a9
FMH		 569 devpriv->dma_bits |= DMA_CH6_CH7;
570 break;
a351ecf3 571 case 0x57: /* dma0 == 7, dma1 == 5 */
a69cc3a9
FMH		 572 devpriv->dma_bits |= DMA_CH7_CH5;
573 break;
574 default:
575 printk(" only supports dma channels 5 through 7\n"
0a85b6f0
MT		 576 " Dual dma only allows the following combinations:\n"
577 " dma 5,6 / 6,7 / or 7,5\n");
a69cc3a9
FMH		 578 return -EINVAL;
579 break;
580 }
581 if (request_dma(dma0, driver_das1800.driver_name)) {
582 printk(" failed to allocate dma channel %i\n", dma0);
583 return -EINVAL;
584 }
585 devpriv->dma0 = dma0;
586 devpriv->dma_current = dma0;
587 if (dma1) {
588 if (request_dma(dma1, driver_das1800.driver_name)) {
589 printk(" failed to allocate dma channel %i\n",
0a85b6f0 590 dma1);
a69cc3a9
FMH		 591 return -EINVAL;
592 }
593 devpriv->dma1 = dma1;
594 }
595 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
596 if (devpriv->ai_buf0 == NULL)
597 return -ENOMEM;
598 devpriv->dma_current_buf = devpriv->ai_buf0;
599 if (dma1) {
600 devpriv->ai_buf1 =
0a85b6f0 601 kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
a69cc3a9
FMH		 602 if (devpriv->ai_buf1 == NULL)
603 return -ENOMEM;
604 }
605 flags = claim_dma_lock();
606 disable_dma(devpriv->dma0);
607 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
608 if (dma1) {
609 disable_dma(devpriv->dma1);
610 set_dma_mode(devpriv->dma1, DMA_MODE_READ);
611 }
612 release_dma_lock(flags);
613 }
614 return 0;
615}
616
0a85b6f0
MT		 617static int das1800_attach(struct comedi_device *dev,
618 struct comedi_devconfig *it)
a69cc3a9 619{
34c43922 620 struct comedi_subdevice *s;
a69cc3a9
FMH		 621 unsigned long iobase = it->options[0];
622 unsigned int irq = it->options[1];
623 unsigned int dma0 = it->options[2];
624 unsigned int dma1 = it->options[3];
625 unsigned long iobase2;
626 int board;
627 int retval;
628
629 /* allocate and initialize dev->private */
0c5a144d 630 if (alloc_private(dev, sizeof(struct das1800_private)) < 0)
a69cc3a9
FMH		 631 return -ENOMEM;
632
633 printk("comedi%d: %s: io 0x%lx", dev->minor, driver_das1800.driver_name,
0a85b6f0 634 iobase);
a69cc3a9
FMH		 635 if (irq) {
636 printk(", irq %u", irq);
637 if (dma0) {
638 printk(", dma %u", dma0);
639 if (dma1)
640 printk(" and %u", dma1);
641 }
642 }
643 printk("\n");
644
645 if (iobase == 0) {
646 printk(" io base address required\n");
647 return -EINVAL;
648 }
649
650 /* check if io addresses are available */
651 if (!request_region(iobase, DAS1800_SIZE, driver_das1800.driver_name)) {
0a85b6f0
MT		 652 printk
653 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
654 iobase, iobase + DAS1800_SIZE - 1);
a69cc3a9
FMH		 655 return -EIO;
656 }
657 dev->iobase = iobase;
658
659 board = das1800_probe(dev);
660 if (board < 0) {
661 printk(" unable to determine board type\n");
662 return -ENODEV;
663 }
664
665 dev->board_ptr = das1800_boards + board;
666 dev->board_name = thisboard->name;
667
a351ecf3 668 /* if it is an 'ao' board with fancy analog out then we need extra io ports */
a69cc3a9
FMH		 669 if (thisboard->ao_ability == 2) {
670 iobase2 = iobase + IOBASE2;
671 if (!request_region(iobase2, DAS1800_SIZE,
0a85b6f0
MT		 672 driver_das1800.driver_name)) {
673 printk
674 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
675 iobase2, iobase2 + DAS1800_SIZE - 1);
a69cc3a9
FMH		 676 return -EIO;
677 }
678 devpriv->iobase2 = iobase2;
679 }
680
681 /* grab our IRQ */
682 if (irq) {
5f74ea14 683 if (request_irq(irq, das1800_interrupt, 0,
a69cc3a9
FMH		 684 driver_das1800.driver_name, dev)) {
685 printk(" unable to allocate irq %u\n", irq);
686 return -EINVAL;
687 }
688 }
689 dev->irq = irq;
690
a351ecf3 691 /* set bits that tell card which irq to use */
a69cc3a9
FMH		 692 switch (irq) {
693 case 0:
694 break;
695 case 3:
696 devpriv->irq_dma_bits |= 0x8;
697 break;
698 case 5:
699 devpriv->irq_dma_bits |= 0x10;
700 break;
701 case 7:
702 devpriv->irq_dma_bits |= 0x18;
703 break;
704 case 10:
705 devpriv->irq_dma_bits |= 0x28;
706 break;
707 case 11:
708 devpriv->irq_dma_bits |= 0x30;
709 break;
710 case 15:
711 devpriv->irq_dma_bits |= 0x38;
712 break;
713 default:
714 printk(" irq out of range\n");
715 return -EINVAL;
716 break;
717 }
718
719 retval = das1800_init_dma(dev, dma0, dma1);
720 if (retval < 0)
721 return retval;
722
723 if (devpriv->ai_buf0 == NULL) {
724 devpriv->ai_buf0 =
0a85b6f0 725 kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
a69cc3a9
FMH		 726 if (devpriv->ai_buf0 == NULL)
727 return -ENOMEM;
728 }
729
730 if (alloc_subdevices(dev, 4) < 0)
731 return -ENOMEM;
732
733 /* analog input subdevice */
734 s = dev->subdevices + 0;
735 dev->read_subdev = s;
736 s->type = COMEDI_SUBD_AI;
737 s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
738 if (thisboard->common)
739 s->subdev_flags |= SDF_COMMON;
740 s->n_chan = thisboard->qram_len;
741 s->len_chanlist = thisboard->qram_len;
742 s->maxdata = (1 << thisboard->resolution) - 1;
743 s->range_table = thisboard->range_ai;
744 s->do_cmd = das1800_ai_do_cmd;
745 s->do_cmdtest = das1800_ai_do_cmdtest;
746 s->insn_read = das1800_ai_rinsn;
747 s->poll = das1800_ai_poll;
748 s->cancel = das1800_cancel;
749
750 /* analog out */
751 s = dev->subdevices + 1;
752 if (thisboard->ao_ability == 1) {
753 s->type = COMEDI_SUBD_AO;
754 s->subdev_flags = SDF_WRITABLE;
755 s->n_chan = thisboard->ao_n_chan;
756 s->maxdata = (1 << thisboard->resolution) - 1;
757 s->range_table = &range_ao_1;
758 s->insn_write = das1800_ao_winsn;
759 } else {
760 s->type = COMEDI_SUBD_UNUSED;
761 }
762
763 /* di */
764 s = dev->subdevices + 2;
765 s->type = COMEDI_SUBD_DI;
766 s->subdev_flags = SDF_READABLE;
767 s->n_chan = 4;
768 s->maxdata = 1;
769 s->range_table = &range_digital;
770 s->insn_bits = das1800_di_rbits;
771
772 /* do */
773 s = dev->subdevices + 3;
774 s->type = COMEDI_SUBD_DO;
775 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
776 s->n_chan = thisboard->do_n_chan;
777 s->maxdata = 1;
778 s->range_table = &range_digital;
779 s->insn_bits = das1800_do_wbits;
780
781 das1800_cancel(dev, dev->read_subdev);
782
a351ecf3 783 /* initialize digital out channels */
a69cc3a9
FMH		 784 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
785
a351ecf3 786 /* initialize analog out channels */
a69cc3a9 787 if (thisboard->ao_ability == 1) {
a351ecf3 788 /* select 'update' dac channel for baseAddress + 0x0 */
a69cc3a9 789 outb(DAC(thisboard->ao_n_chan - 1),
0a85b6f0 790 dev->iobase + DAS1800_SELECT);
a69cc3a9
FMH		 791 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
792 }
793
794 return 0;
795};
796
da91b269 797static int das1800_detach(struct comedi_device *dev)
a69cc3a9
FMH		 798{
799 /* only free stuff if it has been allocated by _attach */
800 if (dev->iobase)
801 release_region(dev->iobase, DAS1800_SIZE);
802 if (dev->irq)
5f74ea14 803 free_irq(dev->irq, dev);
a69cc3a9
FMH		 804 if (dev->private) {
805 if (devpriv->iobase2)
806 release_region(devpriv->iobase2, DAS1800_SIZE);
807 if (devpriv->dma0)
808 free_dma(devpriv->dma0);
809 if (devpriv->dma1)
810 free_dma(devpriv->dma1);
1bf2ee4e
DB		 811 kfree(devpriv->ai_buf0);
812 kfree(devpriv->ai_buf1);
a69cc3a9
FMH		 813 }
814
815 printk("comedi%d: %s: remove\n", dev->minor,
0a85b6f0 816 driver_das1800.driver_name);
a69cc3a9
FMH		 817
818 return 0;
819};
820
821/* probes and checks das-1800 series board type
822 */
da91b269 823static int das1800_probe(struct comedi_device *dev)
a69cc3a9
FMH		 824{
825 int id;
826 int board;
827
828 id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */
0a85b6f0 829 board = ((struct das1800_board *)dev->board_ptr) - das1800_boards;
a69cc3a9
FMH		 830
831 switch (id) {
832 case 0x3:
833 if (board == das1801st_da || board == das1802st_da ||
0a85b6f0 834 board == das1701st_da || board == das1702st_da) {
a69cc3a9 835 printk(" Board model: %s\n",
0a85b6f0 836 das1800_boards[board].name);
a69cc3a9
FMH		 837 return board;
838 }
0a85b6f0
MT		 839 printk
840 (" Board model (probed, not recommended): das-1800st-da series\n");
a69cc3a9
FMH		 841 return das1801st;
842 break;
843 case 0x4:
844 if (board == das1802hr_da || board == das1702hr_da) {
845 printk(" Board model: %s\n",
0a85b6f0 846 das1800_boards[board].name);
a69cc3a9
FMH		 847 return board;
848 }
0a85b6f0
MT		 849 printk
850 (" Board model (probed, not recommended): das-1802hr-da\n");
a69cc3a9
FMH		 851 return das1802hr;
852 break;
853 case 0x5:
854 if (board == das1801ao || board == das1802ao ||
0a85b6f0 855 board == das1701ao || board == das1702ao) {
a69cc3a9 856 printk(" Board model: %s\n",
0a85b6f0 857 das1800_boards[board].name);
a69cc3a9
FMH		 858 return board;
859 }
0a85b6f0
MT		 860 printk
861 (" Board model (probed, not recommended): das-1800ao series\n");
a69cc3a9
FMH		 862 return das1801ao;
863 break;
864 case 0x6:
865 if (board == das1802hr || board == das1702hr) {
866 printk(" Board model: %s\n",
0a85b6f0 867 das1800_boards[board].name);
a69cc3a9
FMH		 868 return board;
869 }
870 printk(" Board model (probed, not recommended): das-1802hr\n");
871 return das1802hr;
872 break;
873 case 0x7:
874 if (board == das1801st || board == das1802st ||
0a85b6f0 875 board == das1701st || board == das1702st) {
a69cc3a9 876 printk(" Board model: %s\n",
0a85b6f0 877 das1800_boards[board].name);
a69cc3a9
FMH		 878 return board;
879 }
0a85b6f0
MT		 880 printk
881 (" Board model (probed, not recommended): das-1800st series\n");
a69cc3a9
FMH		 882 return das1801st;
883 break;
884 case 0x8:
885 if (board == das1801hc || board == das1802hc) {
886 printk(" Board model: %s\n",
0a85b6f0 887 das1800_boards[board].name);
a69cc3a9
FMH		 888 return board;
889 }
0a85b6f0
MT		 890 printk
891 (" Board model (probed, not recommended): das-1800hc series\n");
a69cc3a9
FMH		 892 return das1801hc;
893 break;
894 default:
0a85b6f0
MT		 895 printk
896 (" Board model: probe returned 0x%x (unknown, please report)\n",
897 id);
a69cc3a9
FMH		 898 return board;
899 break;
900 }
901 return -1;
902}
903
0a85b6f0
MT		 904static int das1800_ai_poll(struct comedi_device *dev,
905 struct comedi_subdevice *s)
a69cc3a9
FMH		 906{
907 unsigned long flags;
908
a351ecf3 909 /* prevent race with interrupt handler */
5f74ea14 910 spin_lock_irqsave(&dev->spinlock, flags);
a69cc3a9 911 das1800_ai_handler(dev);
5f74ea14 912 spin_unlock_irqrestore(&dev->spinlock, flags);
a69cc3a9
FMH		 913
914 return s->async->buf_write_count - s->async->buf_read_count;
915}
916
70265d24 917static irqreturn_t das1800_interrupt(int irq, void *d)
a69cc3a9 918{
71b5f4f1 919 struct comedi_device *dev = d;
a69cc3a9
FMH		 920 unsigned int status;
921
922 if (dev->attached == 0) {
923 comedi_error(dev, "premature interrupt");
924 return IRQ_HANDLED;
925 }
926
927 /* Prevent race with das1800_ai_poll() on multi processor systems.
928 * Also protects indirect addressing in das1800_ai_handler */
929 spin_lock(&dev->spinlock);
930 status = inb(dev->iobase + DAS1800_STATUS);
931
932 /* if interrupt was not caused by das-1800 */
933 if (!(status & INT)) {
934 spin_unlock(&dev->spinlock);
935 return IRQ_NONE;
936 }
937 /* clear the interrupt status bit INT */
938 outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
a351ecf3 939 /* handle interrupt */
a69cc3a9
FMH		 940 das1800_ai_handler(dev);
941
942 spin_unlock(&dev->spinlock);
943 return IRQ_HANDLED;
944}
945
a351ecf3 946/* the guts of the interrupt handler, that is shared with das1800_ai_poll */
da91b269 947static void das1800_ai_handler(struct comedi_device *dev)
a69cc3a9 948{
34c43922 949 struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */
d163679c 950 struct comedi_async *async = s->async;
ea6d0d4c 951 struct comedi_cmd *cmd = &async->cmd;
a69cc3a9
FMH		 952 unsigned int status = inb(dev->iobase + DAS1800_STATUS);
953
954 async->events = 0;
a351ecf3 955 /* select adc for base address + 0 */
a69cc3a9 956 outb(ADC, dev->iobase + DAS1800_SELECT);
a351ecf3 957 /* dma buffer full */
a69cc3a9 958 if (devpriv->irq_dma_bits & DMA_ENABLED) {
a351ecf3 959 /* look for data from dma transfer even if dma terminal count hasn't happened yet */
a69cc3a9 960 das1800_handle_dma(dev, s, status);
a351ecf3 961 } else if (status & FHF) { /* if fifo half full */
a69cc3a9 962 das1800_handle_fifo_half_full(dev, s);
a351ecf3 963 } else if (status & FNE) { /* if fifo not empty */
a69cc3a9
FMH		 964 das1800_handle_fifo_not_empty(dev, s);
965 }
966
967 async->events |= COMEDI_CB_BLOCK;
968 /* if the card's fifo has overflowed */
969 if (status & OVF) {
a351ecf3 970 /* clear OVF interrupt bit */
a69cc3a9
FMH		 971 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
972 comedi_error(dev, "DAS1800 FIFO overflow");
973 das1800_cancel(dev, s);
974 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
975 comedi_event(dev, s);
976 return;
977 }
a351ecf3 978 /* stop taking data if appropriate */
a69cc3a9
FMH		 979 /* stop_src TRIG_EXT */
980 if (status & CT0TC) {
a351ecf3 981 /* clear CT0TC interrupt bit */
a69cc3a9 982 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
a351ecf3 983 /* make sure we get all remaining data from board before quitting */
a69cc3a9
FMH		 984 if (devpriv->irq_dma_bits & DMA_ENABLED)
985 das1800_flush_dma(dev, s);
986 else
987 das1800_handle_fifo_not_empty(dev, s);
988 das1800_cancel(dev, s); /* disable hardware conversions */
989 async->events |= COMEDI_CB_EOA;
a351ecf3 990 } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */
a69cc3a9
FMH		 991 das1800_cancel(dev, s); /* disable hardware conversions */
992 async->events |= COMEDI_CB_EOA;
993 }
994
995 comedi_event(dev, s);
996
997 return;
998}
999
0a85b6f0
MT		 1000static void das1800_handle_dma(struct comedi_device *dev,
1001 struct comedi_subdevice *s, unsigned int status)
a69cc3a9
FMH		 1002{
1003 unsigned long flags;
1004 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1005
1006 flags = claim_dma_lock();
1007 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
0a85b6f0 1008 devpriv->dma_current_buf);
a351ecf3 1009 /* re-enable dma channel */
a69cc3a9 1010 set_dma_addr(devpriv->dma_current,
0a85b6f0 1011 virt_to_bus(devpriv->dma_current_buf));
a69cc3a9
FMH		 1012 set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
1013 enable_dma(devpriv->dma_current);
1014 release_dma_lock(flags);
1015
1016 if (status & DMATC) {
a351ecf3 1017 /* clear DMATC interrupt bit */
a69cc3a9 1018 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
a351ecf3 1019 /* switch dma channels for next time, if appropriate */
a69cc3a9 1020 if (dual_dma) {
a351ecf3 1021 /* read data from the other channel next time */
a69cc3a9
FMH		 1022 if (devpriv->dma_current == devpriv->dma0) {
1023 devpriv->dma_current = devpriv->dma1;
1024 devpriv->dma_current_buf = devpriv->ai_buf1;
1025 } else {
1026 devpriv->dma_current = devpriv->dma0;
1027 devpriv->dma_current_buf = devpriv->ai_buf0;
1028 }
1029 }
1030 }
1031
1032 return;
1033}
1034
da91b269 1035static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
0a85b6f0 1036 uint16_t sample)
a69cc3a9
FMH		 1037{
1038 sample += 1 << (thisboard->resolution - 1);
1039 return sample;
1040}
1041
0a85b6f0
MT		 1042static void munge_data(struct comedi_device *dev, uint16_t * array,
1043 unsigned int num_elements)
a69cc3a9
FMH		 1044{
1045 unsigned int i;
1046 int unipolar;
1047
1048 /* see if card is using a unipolar or bipolar range so we can munge data correctly */
1049 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1050
1051 /* convert to unsigned type if we are in a bipolar mode */
1052 if (!unipolar) {
1053 for (i = 0; i < num_elements; i++) {
1054 array[i] = munge_bipolar_sample(dev, array[i]);
1055 }
1056 }
1057}
1058
1059/* Utility function used by das1800_flush_dma() and das1800_handle_dma().
1060 * Assumes dma lock is held */
0a85b6f0
MT		 1061static void das1800_flush_dma_channel(struct comedi_device *dev,
1062 struct comedi_subdevice *s,
1063 unsigned int channel, uint16_t * buffer)
a69cc3a9
FMH		 1064{
1065 unsigned int num_bytes, num_samples;
ea6d0d4c 1066 struct comedi_cmd *cmd = &s->async->cmd;
a69cc3a9
FMH		 1067
1068 disable_dma(channel);
1069
1070 /* clear flip-flop to make sure 2-byte registers
1071 * get set correctly */
1072 clear_dma_ff(channel);
1073
a351ecf3 1074 /* figure out how many points to read */
a69cc3a9 1075 num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
790c5541 1076 num_samples = num_bytes / sizeof(short);
a69cc3a9
FMH		 1077
1078 /* if we only need some of the points */
1079 if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
1080 num_samples = devpriv->count;
1081
1082 munge_data(dev, buffer, num_samples);
1083 cfc_write_array_to_buffer(s, buffer, num_bytes);
1084 if (s->async->cmd.stop_src == TRIG_COUNT)
1085 devpriv->count -= num_samples;
1086
1087 return;
1088}
1089
25985edc 1090/* flushes remaining data from board when external trigger has stopped acquisition
a69cc3a9 1091 * and we are using dma transfers */
0a85b6f0
MT		 1092static void das1800_flush_dma(struct comedi_device *dev,
1093 struct comedi_subdevice *s)
a69cc3a9
FMH		 1094{
1095 unsigned long flags;
1096 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1097
1098 flags = claim_dma_lock();
1099 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
0a85b6f0 1100 devpriv->dma_current_buf);
a69cc3a9
FMH		 1101
1102 if (dual_dma) {
a351ecf3 1103 /* switch to other channel and flush it */
a69cc3a9
FMH		 1104 if (devpriv->dma_current == devpriv->dma0) {
1105 devpriv->dma_current = devpriv->dma1;
1106 devpriv->dma_current_buf = devpriv->ai_buf1;
1107 } else {
1108 devpriv->dma_current = devpriv->dma0;
1109 devpriv->dma_current_buf = devpriv->ai_buf0;
1110 }
1111 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
0a85b6f0 1112 devpriv->dma_current_buf);
a69cc3a9
FMH		 1113 }
1114
1115 release_dma_lock(flags);
1116
a351ecf3 1117 /* get any remaining samples in fifo */
a69cc3a9
FMH		 1118 das1800_handle_fifo_not_empty(dev, s);
1119
1120 return;
1121}
1122
da91b269 1123static void das1800_handle_fifo_half_full(struct comedi_device *dev,
0a85b6f0 1124 struct comedi_subdevice *s)
a69cc3a9
FMH		 1125{
1126 int numPoints = 0; /* number of points to read */
ea6d0d4c 1127 struct comedi_cmd *cmd = &s->async->cmd;
a69cc3a9
FMH		 1128
1129 numPoints = FIFO_SIZE / 2;
1130 /* if we only need some of the points */
1131 if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
1132 numPoints = devpriv->count;
1133 insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
1134 munge_data(dev, devpriv->ai_buf0, numPoints);
1135 cfc_write_array_to_buffer(s, devpriv->ai_buf0,
0a85b6f0 1136 numPoints * sizeof(devpriv->ai_buf0[0]));
a69cc3a9
FMH		 1137 if (cmd->stop_src == TRIG_COUNT)
1138 devpriv->count -= numPoints;
1139 return;
1140}
1141
da91b269 1142static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
0a85b6f0 1143 struct comedi_subdevice *s)
a69cc3a9 1144{
790c5541 1145 short dpnt;
a69cc3a9 1146 int unipolar;
ea6d0d4c 1147 struct comedi_cmd *cmd = &s->async->cmd;
a69cc3a9
FMH		 1148
1149 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1150
1151 while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
1152 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
1153 break;
1154 dpnt = inw(dev->iobase + DAS1800_FIFO);
1155 /* convert to unsigned type if we are in a bipolar mode */
1156 if (!unipolar) ;
1157 dpnt = munge_bipolar_sample(dev, dpnt);
1158 cfc_write_to_buffer(s, dpnt);
1159 if (cmd->stop_src == TRIG_COUNT)
1160 devpriv->count--;
1161 }
1162
1163 return;
1164}
1165
da91b269 1166static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
a69cc3a9
FMH		 1167{
1168 outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */
1169 outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */
1170 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */
1171 if (devpriv->dma0)
1172 disable_dma(devpriv->dma0);
1173 if (devpriv->dma1)
1174 disable_dma(devpriv->dma1);
1175 return 0;
1176}
1177
1178/* test analog input cmd */
0a85b6f0
MT		 1179static int das1800_ai_do_cmdtest(struct comedi_device *dev,
1180 struct comedi_subdevice *s,
1181 struct comedi_cmd *cmd)
a69cc3a9
FMH		 1182{
1183 int err = 0;
1184 int tmp;
1185 unsigned int tmp_arg;
1186 int i;
1187 int unipolar;
1188
1189 /* step 1: make sure trigger sources are trivially valid */
1190
1191 tmp = cmd->start_src;
1192 cmd->start_src &= TRIG_NOW | TRIG_EXT;
1193 if (!cmd->start_src || tmp != cmd->start_src)
1194 err++;
1195
1196 tmp = cmd->scan_begin_src;
1197 cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT;
1198 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
1199 err++;
1200
1201 tmp = cmd->convert_src;
1202 cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
1203 if (!cmd->convert_src || tmp != cmd->convert_src)
1204 err++;
1205
1206 tmp = cmd->scan_end_src;
1207 cmd->scan_end_src &= TRIG_COUNT;
1208 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
1209 err++;
1210
1211 tmp = cmd->stop_src;
1212 cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE;
1213 if (!cmd->stop_src || tmp != cmd->stop_src)
1214 err++;
1215
1216 if (err)
1217 return 1;
1218
1219 /* step 2: make sure trigger sources are unique and mutually compatible */
1220
a351ecf3 1221 /* uniqueness check */
a69cc3a9
FMH		 1222 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
1223 err++;
1224 if (cmd->scan_begin_src != TRIG_FOLLOW &&
0a85b6f0
MT		 1225 cmd->scan_begin_src != TRIG_TIMER &&
1226 cmd->scan_begin_src != TRIG_EXT)
a69cc3a9
FMH		 1227 err++;
1228 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
1229 err++;
1230 if (cmd->stop_src != TRIG_COUNT &&
0a85b6f0 1231 cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT)
a69cc3a9 1232 err++;
a351ecf3 1233 /* compatibility check */
a69cc3a9 1234 if (cmd->scan_begin_src != TRIG_FOLLOW &&
0a85b6f0 1235 cmd->convert_src != TRIG_TIMER)
a69cc3a9
FMH		 1236 err++;
1237
1238 if (err)
1239 return 2;
1240
1241 /* step 3: make sure arguments are trivially compatible */
1242
1243 if (cmd->start_arg != 0) {
1244 cmd->start_arg = 0;
1245 err++;
1246 }
1247 if (cmd->convert_src == TRIG_TIMER) {
1248 if (cmd->convert_arg < thisboard->ai_speed) {
1249 cmd->convert_arg = thisboard->ai_speed;
1250 err++;
1251 }
1252 }
1253 if (!cmd->chanlist_len) {
1254 cmd->chanlist_len = 1;
1255 err++;
1256 }
1257 if (cmd->scan_end_arg != cmd->chanlist_len) {
1258 cmd->scan_end_arg = cmd->chanlist_len;
1259 err++;
1260 }
1261
1262 switch (cmd->stop_src) {
1263 case TRIG_COUNT:
1264 if (!cmd->stop_arg) {
1265 cmd->stop_arg = 1;
1266 err++;
1267 }
1268 break;
1269 case TRIG_NONE:
1270 if (cmd->stop_arg != 0) {
1271 cmd->stop_arg = 0;
1272 err++;
1273 }
1274 break;
1275 default:
1276 break;
1277 }
1278
1279 if (err)
1280 return 3;
1281
1282 /* step 4: fix up any arguments */
1283
1284 if (cmd->convert_src == TRIG_TIMER) {
a351ecf3 1285 /* if we are not in burst mode */
a69cc3a9
FMH		 1286 if (cmd->scan_begin_src == TRIG_FOLLOW) {
1287 tmp_arg = cmd->convert_arg;
1288 /* calculate counter values that give desired timing */
1289 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
0a85b6f0
MT		 1290 &(devpriv->divisor1),
1291 &(devpriv->divisor2),
1292 &(cmd->convert_arg),
1293 cmd->
1294 flags & TRIG_ROUND_MASK);
a69cc3a9
FMH		 1295 if (tmp_arg != cmd->convert_arg)
1296 err++;
1297 }
a351ecf3 1298 /* if we are in burst mode */
a69cc3a9 1299 else {
a351ecf3 1300 /* check that convert_arg is compatible */
a69cc3a9
FMH		 1301 tmp_arg = cmd->convert_arg;
1302 cmd->convert_arg =
0a85b6f0
MT		 1303 burst_convert_arg(cmd->convert_arg,
1304 cmd->flags & TRIG_ROUND_MASK);
a69cc3a9
FMH		 1305 if (tmp_arg != cmd->convert_arg)
1306 err++;
1307
1308 if (cmd->scan_begin_src == TRIG_TIMER) {
a351ecf3 1309 /* if scans are timed faster than conversion rate allows */
a69cc3a9 1310 if (cmd->convert_arg * cmd->chanlist_len >
0a85b6f0 1311 cmd->scan_begin_arg) {
a69cc3a9 1312 cmd->scan_begin_arg =
0a85b6f0
MT		 1313 cmd->convert_arg *
1314 cmd->chanlist_len;
a69cc3a9
FMH		 1315 err++;
1316 }
1317 tmp_arg = cmd->scan_begin_arg;
1318 /* calculate counter values that give desired timing */
1319 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
0a85b6f0
MT		 1320 &(devpriv->
1321 divisor1),
1322 &(devpriv->
1323 divisor2),
1324 &(cmd->
1325 scan_begin_arg),
1326 cmd->
1327 flags &
1328 TRIG_ROUND_MASK);
a69cc3a9
FMH		 1329 if (tmp_arg != cmd->scan_begin_arg)
1330 err++;
1331 }
1332 }
1333 }
1334
1335 if (err)
1336 return 4;
1337
a351ecf3 1338 /* make sure user is not trying to mix unipolar and bipolar ranges */
a69cc3a9
FMH		 1339 if (cmd->chanlist) {
1340 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
1341 for (i = 1; i < cmd->chanlist_len; i++) {
1342 if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
1343 comedi_error(dev,
0a85b6f0 1344 "unipolar and bipolar ranges cannot be mixed in the chanlist");
a69cc3a9
FMH		 1345 err++;
1346 break;
1347 }
1348 }
1349 }
1350
1351 if (err)
1352 return 5;
1353
1354 return 0;
1355}
1356
1357/* analog input cmd interface */
1358
a351ecf3 1359/* first, some utility functions used in the main ai_do_cmd() */
a69cc3a9 1360
a351ecf3 1361/* returns appropriate bits for control register a, depending on command */
ea6d0d4c 1362static int control_a_bits(struct comedi_cmd cmd)
a69cc3a9
FMH		 1363{
1364 int control_a;
1365
a351ecf3 1366 control_a = FFEN; /* enable fifo */
a69cc3a9
FMH		 1367 if (cmd.stop_src == TRIG_EXT) {
1368 control_a |= ATEN;
1369 }
1370 switch (cmd.start_src) {
1371 case TRIG_EXT:
1372 control_a |= TGEN | CGSL;
1373 break;
1374 case TRIG_NOW:
1375 control_a |= CGEN;
1376 break;
1377 default:
1378 break;
1379 }
1380
1381 return control_a;
1382}
1383
a351ecf3 1384/* returns appropriate bits for control register c, depending on command */
ea6d0d4c 1385static int control_c_bits(struct comedi_cmd cmd)
a69cc3a9
FMH		 1386{
1387 int control_c;
1388 int aref;
1389
1390 /* set clock source to internal or external, select analog reference,
1391 * select unipolar / bipolar
1392 */
1393 aref = CR_AREF(cmd.chanlist[0]);
a351ecf3 1394 control_c = UQEN; /* enable upper qram addresses */
a69cc3a9
FMH		 1395 if (aref != AREF_DIFF)
1396 control_c |= SD;
1397 if (aref == AREF_COMMON)
1398 control_c |= CMEN;
1399 /* if a unipolar range was selected */
1400 if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR)
1401 control_c |= UB;
1402 switch (cmd.scan_begin_src) {
a351ecf3 1403 case TRIG_FOLLOW: /* not in burst mode */
a69cc3a9
FMH		 1404 switch (cmd.convert_src) {
1405 case TRIG_TIMER:
1406 /* trig on cascaded counters */
1407 control_c |= IPCLK;
1408 break;
1409 case TRIG_EXT:
1410 /* trig on falling edge of external trigger */
1411 control_c |= XPCLK;
1412 break;
1413 default:
1414 break;
1415 }
1416 break;
1417 case TRIG_TIMER:
a351ecf3 1418 /* burst mode with internal pacer clock */
a69cc3a9
FMH		 1419 control_c |= BMDE | IPCLK;
1420 break;
1421 case TRIG_EXT:
a351ecf3 1422 /* burst mode with external trigger */
a69cc3a9
FMH		 1423 control_c |= BMDE | XPCLK;
1424 break;
1425 default:
1426 break;
1427 }
1428
1429 return control_c;
1430}
1431
a351ecf3 1432/* sets up counters */
da91b269 1433static int setup_counters(struct comedi_device *dev, struct comedi_cmd cmd)
a69cc3a9 1434{
a351ecf3 1435 /* setup cascaded counters for conversion/scan frequency */
a69cc3a9 1436 switch (cmd.scan_begin_src) {
a351ecf3 1437 case TRIG_FOLLOW: /* not in burst mode */
a69cc3a9
FMH		 1438 if (cmd.convert_src == TRIG_TIMER) {
1439 /* set conversion frequency */
1440 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
0a85b6f0
MT		 1441 &(devpriv->divisor1),
1442 &(devpriv->divisor2),
1443 &(cmd.convert_arg),
1444 cmd.
1445 flags & TRIG_ROUND_MASK);
a69cc3a9
FMH		 1446 if (das1800_set_frequency(dev) < 0) {
1447 return -1;
1448 }
1449 }
1450 break;
a351ecf3 1451 case TRIG_TIMER: /* in burst mode */
a69cc3a9
FMH		 1452 /* set scan frequency */
1453 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1),
0a85b6f0
MT		 1454 &(devpriv->divisor2),
1455 &(cmd.scan_begin_arg),
1456 cmd.flags & TRIG_ROUND_MASK);
a69cc3a9
FMH		 1457 if (das1800_set_frequency(dev) < 0) {
1458 return -1;
1459 }
1460 break;
1461 default:
1462 break;
1463 }
1464
a351ecf3 1465 /* setup counter 0 for 'about triggering' */
a69cc3a9 1466 if (cmd.stop_src == TRIG_EXT) {
a351ecf3 1467 /* load counter 0 in mode 0 */
a69cc3a9
FMH		 1468 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1469 }
1470
1471 return 0;
1472}
1473
a351ecf3 1474/* sets up dma */
da91b269 1475static void setup_dma(struct comedi_device *dev, struct comedi_cmd cmd)
a69cc3a9
FMH		 1476{
1477 unsigned long lock_flags;
1478 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1479
1480 if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1481 return;
1482
1483 /* determine a reasonable dma transfer size */
1484 devpriv->dma_transfer_size = suggest_transfer_size(&cmd);
1485 lock_flags = claim_dma_lock();
1486 disable_dma(devpriv->dma0);
1487 /* clear flip-flop to make sure 2-byte registers for
1488 * count and address get set correctly */
1489 clear_dma_ff(devpriv->dma0);
1490 set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
a351ecf3 1491 /* set appropriate size of transfer */
a69cc3a9
FMH		 1492 set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1493 devpriv->dma_current = devpriv->dma0;
1494 devpriv->dma_current_buf = devpriv->ai_buf0;
1495 enable_dma(devpriv->dma0);
a351ecf3 1496 /* set up dual dma if appropriate */
a69cc3a9
FMH		 1497 if (dual_dma) {
1498 disable_dma(devpriv->dma1);
1499 /* clear flip-flop to make sure 2-byte registers for
1500 * count and address get set correctly */
1501 clear_dma_ff(devpriv->dma1);
1502 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
a351ecf3 1503 /* set appropriate size of transfer */
a69cc3a9
FMH		 1504 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1505 enable_dma(devpriv->dma1);
1506 }
1507 release_dma_lock(lock_flags);
1508
1509 return;
1510}
1511
a351ecf3 1512/* programs channel/gain list into card */
da91b269 1513static void program_chanlist(struct comedi_device *dev, struct comedi_cmd cmd)
a69cc3a9
FMH		 1514{
1515 int i, n, chan_range;
1516 unsigned long irq_flags;
a351ecf3 1517 const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */
a69cc3a9
FMH		 1518 const int range_bitshift = 8;
1519
1520 n = cmd.chanlist_len;
a351ecf3 1521 /* spinlock protects indirect addressing */
5f74ea14 1522 spin_lock_irqsave(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1523 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1524 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */
1525 /* make channel / gain list */
1526 for (i = 0; i < n; i++) {
1527 chan_range =
0a85b6f0
MT		 1528 CR_CHAN(cmd.
1529 chanlist[i]) | ((CR_RANGE(cmd.chanlist[i]) &
1530 range_mask) << range_bitshift);
a69cc3a9
FMH		 1531 outw(chan_range, dev->iobase + DAS1800_QRAM);
1532 }
1533 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
5f74ea14 1534 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1535
1536 return;
1537}
1538
a351ecf3 1539/* analog input do_cmd */
0a85b6f0
MT		 1540static int das1800_ai_do_cmd(struct comedi_device *dev,
1541 struct comedi_subdevice *s)
a69cc3a9
FMH		 1542{
1543 int ret;
1544 int control_a, control_c;
d163679c 1545 struct comedi_async *async = s->async;
ea6d0d4c 1546 struct comedi_cmd cmd = async->cmd;
a69cc3a9
FMH		 1547
1548 if (!dev->irq) {
1549 comedi_error(dev,
0a85b6f0 1550 "no irq assigned for das-1800, cannot do hardware conversions");
a69cc3a9
FMH		 1551 return -1;
1552 }
1553
1554 /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1555 * (because dma in handler is unsafe at hard real-time priority) */
1556 if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT)) {
1557 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1558 } else {
1559 devpriv->irq_dma_bits |= devpriv->dma_bits;
1560 }
a351ecf3 1561 /* interrupt on end of conversion for TRIG_WAKE_EOS */
a69cc3a9 1562 if (cmd.flags & TRIG_WAKE_EOS) {
a351ecf3 1563 /* interrupt fifo not empty */
a69cc3a9
FMH		 1564 devpriv->irq_dma_bits &= ~FIMD;
1565 } else {
a351ecf3 1566 /* interrupt fifo half full */
a69cc3a9
FMH		 1567 devpriv->irq_dma_bits |= FIMD;
1568 }
a351ecf3 1569 /* determine how many conversions we need */
a69cc3a9
FMH		 1570 if (cmd.stop_src == TRIG_COUNT) {
1571 devpriv->count = cmd.stop_arg * cmd.chanlist_len;
1572 }
1573
1574 das1800_cancel(dev, s);
1575
a351ecf3 1576 /* determine proper bits for control registers */
a69cc3a9
FMH		 1577 control_a = control_a_bits(cmd);
1578 control_c = control_c_bits(cmd);
1579
1580 /* setup card and start */
1581 program_chanlist(dev, cmd);
1582 ret = setup_counters(dev, cmd);
1583 if (ret < 0) {
1584 comedi_error(dev, "Error setting up counters");
1585 return ret;
1586 }
1587 setup_dma(dev, cmd);
1588 outb(control_c, dev->iobase + DAS1800_CONTROL_C);
a351ecf3 1589 /* set conversion rate and length for burst mode */
a69cc3a9 1590 if (control_c & BMDE) {
a351ecf3 1591 /* program conversion period with number of microseconds minus 1 */
a69cc3a9 1592 outb(cmd.convert_arg / 1000 - 1,
0a85b6f0 1593 dev->iobase + DAS1800_BURST_RATE);
a69cc3a9
FMH		 1594 outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1595 }
a351ecf3 1596 outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */
a69cc3a9
FMH		 1597 outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */
1598 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1599
1600 return 0;
1601}
1602
1603/* read analog input */
0a85b6f0
MT		 1604static int das1800_ai_rinsn(struct comedi_device *dev,
1605 struct comedi_subdevice *s,
1606 struct comedi_insn *insn, unsigned int *data)
a69cc3a9
FMH		 1607{
1608 int i, n;
1609 int chan, range, aref, chan_range;
1610 int timeout = 1000;
1611 short dpnt;
1612 int conv_flags = 0;
1613 unsigned long irq_flags;
1614
1615 /* set up analog reference and unipolar / bipolar mode */
1616 aref = CR_AREF(insn->chanspec);
1617 conv_flags |= UQEN;
1618 if (aref != AREF_DIFF)
1619 conv_flags |= SD;
1620 if (aref == AREF_COMMON)
1621 conv_flags |= CMEN;
1622 /* if a unipolar range was selected */
1623 if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1624 conv_flags |= UB;
1625
1626 outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */
1627 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1628 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */
1629 outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1630
1631 chan = CR_CHAN(insn->chanspec);
1632 /* mask of unipolar/bipolar bit from range */
1633 range = CR_RANGE(insn->chanspec) & 0x3;
1634 chan_range = chan | (range << 8);
5f74ea14 1635 spin_lock_irqsave(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1636 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1637 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */
1638 outw(chan_range, dev->iobase + DAS1800_QRAM);
1639 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1640 outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */
1641
1642 for (n = 0; n < insn->n; n++) {
1643 /* trigger conversion */
1644 outb(0, dev->iobase + DAS1800_FIFO);
1645 for (i = 0; i < timeout; i++) {
1646 if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1647 break;
1648 }
1649 if (i == timeout) {
1650 comedi_error(dev, "timeout");
d18c5906
GKH		 1651 n = -ETIME;
1652 goto exit;
a69cc3a9
FMH		 1653 }
1654 dpnt = inw(dev->iobase + DAS1800_FIFO);
1655 /* shift data to offset binary for bipolar ranges */
1656 if ((conv_flags & UB) == 0)
1657 dpnt += 1 << (thisboard->resolution - 1);
1658 data[n] = dpnt;
1659 }
d18c5906 1660exit:
5f74ea14 1661 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1662
1663 return n;
1664}
1665
1666/* writes to an analog output channel */
0a85b6f0
MT		 1667static int das1800_ao_winsn(struct comedi_device *dev,
1668 struct comedi_subdevice *s,
1669 struct comedi_insn *insn, unsigned int *data)
a69cc3a9
FMH		 1670{
1671 int chan = CR_CHAN(insn->chanspec);
a351ecf3 1672/* int range = CR_RANGE(insn->chanspec); */
a69cc3a9
FMH		 1673 int update_chan = thisboard->ao_n_chan - 1;
1674 short output;
1675 unsigned long irq_flags;
1676
a351ecf3 1677 /* card expects two's complement data */
a69cc3a9 1678 output = data[0] - (1 << (thisboard->resolution - 1));
a351ecf3 1679 /* if the write is to the 'update' channel, we need to remember its value */
a69cc3a9
FMH		 1680 if (chan == update_chan)
1681 devpriv->ao_update_bits = output;
a351ecf3 1682 /* write to channel */
5f74ea14 1683 spin_lock_irqsave(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1684 outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */
1685 outw(output, dev->iobase + DAS1800_DAC);
a351ecf3 1686 /* now we need to write to 'update' channel to update all dac channels */
a69cc3a9
FMH		 1687 if (chan != update_chan) {
1688 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */
1689 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1690 }
5f74ea14 1691 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1692
1693 return 1;
1694}
1695
1696/* reads from digital input channels */
0a85b6f0
MT		 1697static int das1800_di_rbits(struct comedi_device *dev,
1698 struct comedi_subdevice *s,
1699 struct comedi_insn *insn, unsigned int *data)
a69cc3a9
FMH		 1700{
1701
1702 data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1703 data[0] = 0;
1704
1705 return 2;
1706}
1707
1708/* writes to digital output channels */
0a85b6f0
MT		 1709static int das1800_do_wbits(struct comedi_device *dev,
1710 struct comedi_subdevice *s,
1711 struct comedi_insn *insn, unsigned int *data)
a69cc3a9 1712{
790c5541 1713 unsigned int wbits;
a69cc3a9 1714
a351ecf3 1715 /* only set bits that have been masked */
a69cc3a9
FMH		 1716 data[0] &= (1 << s->n_chan) - 1;
1717 wbits = devpriv->do_bits;
1718 wbits &= ~data[0];
1719 wbits |= data[0] & data[1];
1720 devpriv->do_bits = wbits;
1721
1722 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1723
1724 data[1] = devpriv->do_bits;
1725
1726 return 2;
1727}
1728
1729/* loads counters with divisor1, divisor2 from private structure */
da91b269 1730static int das1800_set_frequency(struct comedi_device *dev)
a69cc3a9
FMH		 1731{
1732 int err = 0;
1733
a351ecf3 1734 /* counter 1, mode 2 */
a69cc3a9 1735 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
0a85b6f0 1736 2))
a69cc3a9 1737 err++;
a351ecf3 1738 /* counter 2, mode 2 */
a69cc3a9 1739 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
0a85b6f0 1740 2))
a69cc3a9
FMH		 1741 err++;
1742 if (err)
1743 return -1;
1744
1745 return 0;
1746}
1747
1748/* converts requested conversion timing to timing compatible with
1749 * hardware, used only when card is in 'burst mode'
1750 */
1751static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
1752{
1753 unsigned int micro_sec;
1754
a351ecf3 1755 /* in burst mode, the maximum conversion time is 64 microseconds */
a69cc3a9
FMH		 1756 if (convert_arg > 64000)
1757 convert_arg = 64000;
1758
a351ecf3 1759 /* the conversion time must be an integral number of microseconds */
a69cc3a9
FMH		 1760 switch (round_mode) {
1761 case TRIG_ROUND_NEAREST:
1762 default:
1763 micro_sec = (convert_arg + 500) / 1000;
1764 break;
1765 case TRIG_ROUND_DOWN:
1766 micro_sec = convert_arg / 1000;
1767 break;
1768 case TRIG_ROUND_UP:
1769 micro_sec = (convert_arg - 1) / 1000 + 1;
1770 break;
1771 }
1772
a351ecf3 1773 /* return number of nanoseconds */
a69cc3a9
FMH		 1774 return micro_sec * 1000;
1775}
1776
a351ecf3 1777/* utility function that suggests a dma transfer size based on the conversion period 'ns' */
da91b269 1778static unsigned int suggest_transfer_size(struct comedi_cmd *cmd)
a69cc3a9
FMH		 1779{
1780 unsigned int size = DMA_BUF_SIZE;
a351ecf3
BP		 1781 static const int sample_size = 2; /* size in bytes of one sample from board */
1782 unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */
1783 unsigned int max_size; /* maximum size we will allow for a transfer */
a69cc3a9 1784
a351ecf3 1785 /* make dma buffer fill in 0.3 seconds for timed modes */
a69cc3a9 1786 switch (cmd->scan_begin_src) {
a351ecf3 1787 case TRIG_FOLLOW: /* not in burst mode */
a69cc3a9
FMH		 1788 if (cmd->convert_src == TRIG_TIMER)
1789 size = (fill_time / cmd->convert_arg) * sample_size;
1790 break;
1791 case TRIG_TIMER:
1792 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
0a85b6f0 1793 sample_size;
a69cc3a9
FMH		 1794 break;
1795 default:
1796 size = DMA_BUF_SIZE;
1797 break;
1798 }
1799
a351ecf3 1800 /* set a minimum and maximum size allowed */
a69cc3a9 1801 max_size = DMA_BUF_SIZE;
a351ecf3 1802 /* if we are taking limited number of conversions, limit transfer size to that */
a69cc3a9 1803 if (cmd->stop_src == TRIG_COUNT &&
0a85b6f0 1804 cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
a69cc3a9
FMH		 1805 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1806
1807 if (size > max_size)
1808 size = max_size;
1809 if (size < sample_size)
1810 size = sample_size;
1811
1812 return size;
1813}
90f703d3
AT		 1814
1815MODULE_AUTHOR("Comedi http://www.comedi.org");
1816MODULE_DESCRIPTION("Comedi low-level driver");
1817MODULE_LICENSE("GPL");
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