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[net-next-2.6.git] / drivers / staging / comedi / drivers / das1800.c
CommitLineData
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 */
534COMEDI_INITCLEANUP(driver_das1800);
535
da91b269 536static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
0a85b6f0 537 unsigned int dma1)
a69cc3a9
FMH		 538{
539 unsigned long flags;
540
a351ecf3 541 /* need an irq to do dma */
a69cc3a9 542 if (dev->irq && dma0) {
a351ecf3 543 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
a69cc3a9 544 switch ((dma0 & 0x7) | (dma1 << 4)) {
a351ecf3 545 case 0x5: /* dma0 == 5 */
a69cc3a9
FMH		 546 devpriv->dma_bits |= DMA_CH5;
547 break;
a351ecf3 548 case 0x6: /* dma0 == 6 */
a69cc3a9
FMH		 549 devpriv->dma_bits |= DMA_CH6;
550 break;
a351ecf3 551 case 0x7: /* dma0 == 7 */
a69cc3a9
FMH		 552 devpriv->dma_bits |= DMA_CH7;
553 break;
a351ecf3 554 case 0x65: /* dma0 == 5, dma1 == 6 */
a69cc3a9
FMH		 555 devpriv->dma_bits |= DMA_CH5_CH6;
556 break;
a351ecf3 557 case 0x76: /* dma0 == 6, dma1 == 7 */
a69cc3a9
FMH		 558 devpriv->dma_bits |= DMA_CH6_CH7;
559 break;
a351ecf3 560 case 0x57: /* dma0 == 7, dma1 == 5 */
a69cc3a9
FMH		 561 devpriv->dma_bits |= DMA_CH7_CH5;
562 break;
563 default:
564 printk(" only supports dma channels 5 through 7\n"
0a85b6f0
MT		 565 " Dual dma only allows the following combinations:\n"
566 " dma 5,6 / 6,7 / or 7,5\n");
a69cc3a9
FMH		 567 return -EINVAL;
568 break;
569 }
570 if (request_dma(dma0, driver_das1800.driver_name)) {
571 printk(" failed to allocate dma channel %i\n", dma0);
572 return -EINVAL;
573 }
574 devpriv->dma0 = dma0;
575 devpriv->dma_current = dma0;
576 if (dma1) {
577 if (request_dma(dma1, driver_das1800.driver_name)) {
578 printk(" failed to allocate dma channel %i\n",
0a85b6f0 579 dma1);
a69cc3a9
FMH		 580 return -EINVAL;
581 }
582 devpriv->dma1 = dma1;
583 }
584 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
585 if (devpriv->ai_buf0 == NULL)
586 return -ENOMEM;
587 devpriv->dma_current_buf = devpriv->ai_buf0;
588 if (dma1) {
589 devpriv->ai_buf1 =
0a85b6f0 590 kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
a69cc3a9
FMH		 591 if (devpriv->ai_buf1 == NULL)
592 return -ENOMEM;
593 }
594 flags = claim_dma_lock();
595 disable_dma(devpriv->dma0);
596 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
597 if (dma1) {
598 disable_dma(devpriv->dma1);
599 set_dma_mode(devpriv->dma1, DMA_MODE_READ);
600 }
601 release_dma_lock(flags);
602 }
603 return 0;
604}
605
0a85b6f0
MT		 606static int das1800_attach(struct comedi_device *dev,
607 struct comedi_devconfig *it)
a69cc3a9 608{
34c43922 609 struct comedi_subdevice *s;
a69cc3a9
FMH		 610 unsigned long iobase = it->options[0];
611 unsigned int irq = it->options[1];
612 unsigned int dma0 = it->options[2];
613 unsigned int dma1 = it->options[3];
614 unsigned long iobase2;
615 int board;
616 int retval;
617
618 /* allocate and initialize dev->private */
0c5a144d 619 if (alloc_private(dev, sizeof(struct das1800_private)) < 0)
a69cc3a9
FMH		 620 return -ENOMEM;
621
622 printk("comedi%d: %s: io 0x%lx", dev->minor, driver_das1800.driver_name,
0a85b6f0 623 iobase);
a69cc3a9
FMH		 624 if (irq) {
625 printk(", irq %u", irq);
626 if (dma0) {
627 printk(", dma %u", dma0);
628 if (dma1)
629 printk(" and %u", dma1);
630 }
631 }
632 printk("\n");
633
634 if (iobase == 0) {
635 printk(" io base address required\n");
636 return -EINVAL;
637 }
638
639 /* check if io addresses are available */
640 if (!request_region(iobase, DAS1800_SIZE, driver_das1800.driver_name)) {
0a85b6f0
MT		 641 printk
642 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
643 iobase, iobase + DAS1800_SIZE - 1);
a69cc3a9
FMH		 644 return -EIO;
645 }
646 dev->iobase = iobase;
647
648 board = das1800_probe(dev);
649 if (board < 0) {
650 printk(" unable to determine board type\n");
651 return -ENODEV;
652 }
653
654 dev->board_ptr = das1800_boards + board;
655 dev->board_name = thisboard->name;
656
a351ecf3 657 /* if it is an 'ao' board with fancy analog out then we need extra io ports */
a69cc3a9
FMH		 658 if (thisboard->ao_ability == 2) {
659 iobase2 = iobase + IOBASE2;
660 if (!request_region(iobase2, DAS1800_SIZE,
0a85b6f0
MT		 661 driver_das1800.driver_name)) {
662 printk
663 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
664 iobase2, iobase2 + DAS1800_SIZE - 1);
a69cc3a9
FMH		 665 return -EIO;
666 }
667 devpriv->iobase2 = iobase2;
668 }
669
670 /* grab our IRQ */
671 if (irq) {
5f74ea14 672 if (request_irq(irq, das1800_interrupt, 0,
a69cc3a9
FMH		 673 driver_das1800.driver_name, dev)) {
674 printk(" unable to allocate irq %u\n", irq);
675 return -EINVAL;
676 }
677 }
678 dev->irq = irq;
679
a351ecf3 680 /* set bits that tell card which irq to use */
a69cc3a9
FMH		 681 switch (irq) {
682 case 0:
683 break;
684 case 3:
685 devpriv->irq_dma_bits |= 0x8;
686 break;
687 case 5:
688 devpriv->irq_dma_bits |= 0x10;
689 break;
690 case 7:
691 devpriv->irq_dma_bits |= 0x18;
692 break;
693 case 10:
694 devpriv->irq_dma_bits |= 0x28;
695 break;
696 case 11:
697 devpriv->irq_dma_bits |= 0x30;
698 break;
699 case 15:
700 devpriv->irq_dma_bits |= 0x38;
701 break;
702 default:
703 printk(" irq out of range\n");
704 return -EINVAL;
705 break;
706 }
707
708 retval = das1800_init_dma(dev, dma0, dma1);
709 if (retval < 0)
710 return retval;
711
712 if (devpriv->ai_buf0 == NULL) {
713 devpriv->ai_buf0 =
0a85b6f0 714 kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
a69cc3a9
FMH		 715 if (devpriv->ai_buf0 == NULL)
716 return -ENOMEM;
717 }
718
719 if (alloc_subdevices(dev, 4) < 0)
720 return -ENOMEM;
721
722 /* analog input subdevice */
723 s = dev->subdevices + 0;
724 dev->read_subdev = s;
725 s->type = COMEDI_SUBD_AI;
726 s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
727 if (thisboard->common)
728 s->subdev_flags |= SDF_COMMON;
729 s->n_chan = thisboard->qram_len;
730 s->len_chanlist = thisboard->qram_len;
731 s->maxdata = (1 << thisboard->resolution) - 1;
732 s->range_table = thisboard->range_ai;
733 s->do_cmd = das1800_ai_do_cmd;
734 s->do_cmdtest = das1800_ai_do_cmdtest;
735 s->insn_read = das1800_ai_rinsn;
736 s->poll = das1800_ai_poll;
737 s->cancel = das1800_cancel;
738
739 /* analog out */
740 s = dev->subdevices + 1;
741 if (thisboard->ao_ability == 1) {
742 s->type = COMEDI_SUBD_AO;
743 s->subdev_flags = SDF_WRITABLE;
744 s->n_chan = thisboard->ao_n_chan;
745 s->maxdata = (1 << thisboard->resolution) - 1;
746 s->range_table = &range_ao_1;
747 s->insn_write = das1800_ao_winsn;
748 } else {
749 s->type = COMEDI_SUBD_UNUSED;
750 }
751
752 /* di */
753 s = dev->subdevices + 2;
754 s->type = COMEDI_SUBD_DI;
755 s->subdev_flags = SDF_READABLE;
756 s->n_chan = 4;
757 s->maxdata = 1;
758 s->range_table = &range_digital;
759 s->insn_bits = das1800_di_rbits;
760
761 /* do */
762 s = dev->subdevices + 3;
763 s->type = COMEDI_SUBD_DO;
764 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
765 s->n_chan = thisboard->do_n_chan;
766 s->maxdata = 1;
767 s->range_table = &range_digital;
768 s->insn_bits = das1800_do_wbits;
769
770 das1800_cancel(dev, dev->read_subdev);
771
a351ecf3 772 /* initialize digital out channels */
a69cc3a9
FMH		 773 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
774
a351ecf3 775 /* initialize analog out channels */
a69cc3a9 776 if (thisboard->ao_ability == 1) {
a351ecf3 777 /* select 'update' dac channel for baseAddress + 0x0 */
a69cc3a9 778 outb(DAC(thisboard->ao_n_chan - 1),
0a85b6f0 779 dev->iobase + DAS1800_SELECT);
a69cc3a9
FMH		 780 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
781 }
782
783 return 0;
784};
785
da91b269 786static int das1800_detach(struct comedi_device *dev)
a69cc3a9
FMH		 787{
788 /* only free stuff if it has been allocated by _attach */
789 if (dev->iobase)
790 release_region(dev->iobase, DAS1800_SIZE);
791 if (dev->irq)
5f74ea14 792 free_irq(dev->irq, dev);
a69cc3a9
FMH		 793 if (dev->private) {
794 if (devpriv->iobase2)
795 release_region(devpriv->iobase2, DAS1800_SIZE);
796 if (devpriv->dma0)
797 free_dma(devpriv->dma0);
798 if (devpriv->dma1)
799 free_dma(devpriv->dma1);
800 if (devpriv->ai_buf0)
801 kfree(devpriv->ai_buf0);
802 if (devpriv->ai_buf1)
803 kfree(devpriv->ai_buf1);
804 }
805
806 printk("comedi%d: %s: remove\n", dev->minor,
0a85b6f0 807 driver_das1800.driver_name);
a69cc3a9
FMH		 808
809 return 0;
810};
811
812/* probes and checks das-1800 series board type
813 */
da91b269 814static int das1800_probe(struct comedi_device *dev)
a69cc3a9
FMH		 815{
816 int id;
817 int board;
818
819 id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */
0a85b6f0 820 board = ((struct das1800_board *)dev->board_ptr) - das1800_boards;
a69cc3a9
FMH		 821
822 switch (id) {
823 case 0x3:
824 if (board == das1801st_da || board == das1802st_da ||
0a85b6f0 825 board == das1701st_da || board == das1702st_da) {
a69cc3a9 826 printk(" Board model: %s\n",
0a85b6f0 827 das1800_boards[board].name);
a69cc3a9
FMH		 828 return board;
829 }
0a85b6f0
MT		 830 printk
831 (" Board model (probed, not recommended): das-1800st-da series\n");
a69cc3a9
FMH		 832 return das1801st;
833 break;
834 case 0x4:
835 if (board == das1802hr_da || board == das1702hr_da) {
836 printk(" Board model: %s\n",
0a85b6f0 837 das1800_boards[board].name);
a69cc3a9
FMH		 838 return board;
839 }
0a85b6f0
MT		 840 printk
841 (" Board model (probed, not recommended): das-1802hr-da\n");
a69cc3a9
FMH		 842 return das1802hr;
843 break;
844 case 0x5:
845 if (board == das1801ao || board == das1802ao ||
0a85b6f0 846 board == das1701ao || board == das1702ao) {
a69cc3a9 847 printk(" Board model: %s\n",
0a85b6f0 848 das1800_boards[board].name);
a69cc3a9
FMH		 849 return board;
850 }
0a85b6f0
MT		 851 printk
852 (" Board model (probed, not recommended): das-1800ao series\n");
a69cc3a9
FMH		 853 return das1801ao;
854 break;
855 case 0x6:
856 if (board == das1802hr || board == das1702hr) {
857 printk(" Board model: %s\n",
0a85b6f0 858 das1800_boards[board].name);
a69cc3a9
FMH		 859 return board;
860 }
861 printk(" Board model (probed, not recommended): das-1802hr\n");
862 return das1802hr;
863 break;
864 case 0x7:
865 if (board == das1801st || board == das1802st ||
0a85b6f0 866 board == das1701st || board == das1702st) {
a69cc3a9 867 printk(" Board model: %s\n",
0a85b6f0 868 das1800_boards[board].name);
a69cc3a9
FMH		 869 return board;
870 }
0a85b6f0
MT		 871 printk
872 (" Board model (probed, not recommended): das-1800st series\n");
a69cc3a9
FMH		 873 return das1801st;
874 break;
875 case 0x8:
876 if (board == das1801hc || board == das1802hc) {
877 printk(" Board model: %s\n",
0a85b6f0 878 das1800_boards[board].name);
a69cc3a9
FMH		 879 return board;
880 }
0a85b6f0
MT		 881 printk
882 (" Board model (probed, not recommended): das-1800hc series\n");
a69cc3a9
FMH		 883 return das1801hc;
884 break;
885 default:
0a85b6f0
MT		 886 printk
887 (" Board model: probe returned 0x%x (unknown, please report)\n",
888 id);
a69cc3a9
FMH		 889 return board;
890 break;
891 }
892 return -1;
893}
894
0a85b6f0
MT		 895static int das1800_ai_poll(struct comedi_device *dev,
896 struct comedi_subdevice *s)
a69cc3a9
FMH		 897{
898 unsigned long flags;
899
a351ecf3 900 /* prevent race with interrupt handler */
5f74ea14 901 spin_lock_irqsave(&dev->spinlock, flags);
a69cc3a9 902 das1800_ai_handler(dev);
5f74ea14 903 spin_unlock_irqrestore(&dev->spinlock, flags);
a69cc3a9
FMH		 904
905 return s->async->buf_write_count - s->async->buf_read_count;
906}
907
70265d24 908static irqreturn_t das1800_interrupt(int irq, void *d)
a69cc3a9 909{
71b5f4f1 910 struct comedi_device *dev = d;
a69cc3a9
FMH		 911 unsigned int status;
912
913 if (dev->attached == 0) {
914 comedi_error(dev, "premature interrupt");
915 return IRQ_HANDLED;
916 }
917
918 /* Prevent race with das1800_ai_poll() on multi processor systems.
919 * Also protects indirect addressing in das1800_ai_handler */
920 spin_lock(&dev->spinlock);
921 status = inb(dev->iobase + DAS1800_STATUS);
922
923 /* if interrupt was not caused by das-1800 */
924 if (!(status & INT)) {
925 spin_unlock(&dev->spinlock);
926 return IRQ_NONE;
927 }
928 /* clear the interrupt status bit INT */
929 outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
a351ecf3 930 /* handle interrupt */
a69cc3a9
FMH		 931 das1800_ai_handler(dev);
932
933 spin_unlock(&dev->spinlock);
934 return IRQ_HANDLED;
935}
936
a351ecf3 937/* the guts of the interrupt handler, that is shared with das1800_ai_poll */
da91b269 938static void das1800_ai_handler(struct comedi_device *dev)
a69cc3a9 939{
34c43922 940 struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */
d163679c 941 struct comedi_async *async = s->async;
ea6d0d4c 942 struct comedi_cmd *cmd = &async->cmd;
a69cc3a9
FMH		 943 unsigned int status = inb(dev->iobase + DAS1800_STATUS);
944
945 async->events = 0;
a351ecf3 946 /* select adc for base address + 0 */
a69cc3a9 947 outb(ADC, dev->iobase + DAS1800_SELECT);
a351ecf3 948 /* dma buffer full */
a69cc3a9 949 if (devpriv->irq_dma_bits & DMA_ENABLED) {
a351ecf3 950 /* look for data from dma transfer even if dma terminal count hasn't happened yet */
a69cc3a9 951 das1800_handle_dma(dev, s, status);
a351ecf3 952 } else if (status & FHF) { /* if fifo half full */
a69cc3a9 953 das1800_handle_fifo_half_full(dev, s);
a351ecf3 954 } else if (status & FNE) { /* if fifo not empty */
a69cc3a9
FMH		 955 das1800_handle_fifo_not_empty(dev, s);
956 }
957
958 async->events |= COMEDI_CB_BLOCK;
959 /* if the card's fifo has overflowed */
960 if (status & OVF) {
a351ecf3 961 /* clear OVF interrupt bit */
a69cc3a9
FMH		 962 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
963 comedi_error(dev, "DAS1800 FIFO overflow");
964 das1800_cancel(dev, s);
965 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
966 comedi_event(dev, s);
967 return;
968 }
a351ecf3 969 /* stop taking data if appropriate */
a69cc3a9
FMH		 970 /* stop_src TRIG_EXT */
971 if (status & CT0TC) {
a351ecf3 972 /* clear CT0TC interrupt bit */
a69cc3a9 973 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
a351ecf3 974 /* make sure we get all remaining data from board before quitting */
a69cc3a9
FMH		 975 if (devpriv->irq_dma_bits & DMA_ENABLED)
976 das1800_flush_dma(dev, s);
977 else
978 das1800_handle_fifo_not_empty(dev, s);
979 das1800_cancel(dev, s); /* disable hardware conversions */
980 async->events |= COMEDI_CB_EOA;
a351ecf3 981 } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */
a69cc3a9
FMH		 982 das1800_cancel(dev, s); /* disable hardware conversions */
983 async->events |= COMEDI_CB_EOA;
984 }
985
986 comedi_event(dev, s);
987
988 return;
989}
990
0a85b6f0
MT		 991static void das1800_handle_dma(struct comedi_device *dev,
992 struct comedi_subdevice *s, unsigned int status)
a69cc3a9
FMH		 993{
994 unsigned long flags;
995 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
996
997 flags = claim_dma_lock();
998 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
0a85b6f0 999 devpriv->dma_current_buf);
a351ecf3 1000 /* re-enable dma channel */
a69cc3a9 1001 set_dma_addr(devpriv->dma_current,
0a85b6f0 1002 virt_to_bus(devpriv->dma_current_buf));
a69cc3a9
FMH		 1003 set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
1004 enable_dma(devpriv->dma_current);
1005 release_dma_lock(flags);
1006
1007 if (status & DMATC) {
a351ecf3 1008 /* clear DMATC interrupt bit */
a69cc3a9 1009 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
a351ecf3 1010 /* switch dma channels for next time, if appropriate */
a69cc3a9 1011 if (dual_dma) {
a351ecf3 1012 /* read data from the other channel next time */
a69cc3a9
FMH		 1013 if (devpriv->dma_current == devpriv->dma0) {
1014 devpriv->dma_current = devpriv->dma1;
1015 devpriv->dma_current_buf = devpriv->ai_buf1;
1016 } else {
1017 devpriv->dma_current = devpriv->dma0;
1018 devpriv->dma_current_buf = devpriv->ai_buf0;
1019 }
1020 }
1021 }
1022
1023 return;
1024}
1025
da91b269 1026static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
0a85b6f0 1027 uint16_t sample)
a69cc3a9
FMH		 1028{
1029 sample += 1 << (thisboard->resolution - 1);
1030 return sample;
1031}
1032
0a85b6f0
MT		 1033static void munge_data(struct comedi_device *dev, uint16_t * array,
1034 unsigned int num_elements)
a69cc3a9
FMH		 1035{
1036 unsigned int i;
1037 int unipolar;
1038
1039 /* see if card is using a unipolar or bipolar range so we can munge data correctly */
1040 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1041
1042 /* convert to unsigned type if we are in a bipolar mode */
1043 if (!unipolar) {
1044 for (i = 0; i < num_elements; i++) {
1045 array[i] = munge_bipolar_sample(dev, array[i]);
1046 }
1047 }
1048}
1049
1050/* Utility function used by das1800_flush_dma() and das1800_handle_dma().
1051 * Assumes dma lock is held */
0a85b6f0
MT		 1052static void das1800_flush_dma_channel(struct comedi_device *dev,
1053 struct comedi_subdevice *s,
1054 unsigned int channel, uint16_t * buffer)
a69cc3a9
FMH		 1055{
1056 unsigned int num_bytes, num_samples;
ea6d0d4c 1057 struct comedi_cmd *cmd = &s->async->cmd;
a69cc3a9
FMH		 1058
1059 disable_dma(channel);
1060
1061 /* clear flip-flop to make sure 2-byte registers
1062 * get set correctly */
1063 clear_dma_ff(channel);
1064
a351ecf3 1065 /* figure out how many points to read */
a69cc3a9 1066 num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
790c5541 1067 num_samples = num_bytes / sizeof(short);
a69cc3a9
FMH		 1068
1069 /* if we only need some of the points */
1070 if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
1071 num_samples = devpriv->count;
1072
1073 munge_data(dev, buffer, num_samples);
1074 cfc_write_array_to_buffer(s, buffer, num_bytes);
1075 if (s->async->cmd.stop_src == TRIG_COUNT)
1076 devpriv->count -= num_samples;
1077
1078 return;
1079}
1080
1081/* flushes remaining data from board when external trigger has stopped aquisition
1082 * and we are using dma transfers */
0a85b6f0
MT		 1083static void das1800_flush_dma(struct comedi_device *dev,
1084 struct comedi_subdevice *s)
a69cc3a9
FMH		 1085{
1086 unsigned long flags;
1087 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1088
1089 flags = claim_dma_lock();
1090 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
0a85b6f0 1091 devpriv->dma_current_buf);
a69cc3a9
FMH		 1092
1093 if (dual_dma) {
a351ecf3 1094 /* switch to other channel and flush it */
a69cc3a9
FMH		 1095 if (devpriv->dma_current == devpriv->dma0) {
1096 devpriv->dma_current = devpriv->dma1;
1097 devpriv->dma_current_buf = devpriv->ai_buf1;
1098 } else {
1099 devpriv->dma_current = devpriv->dma0;
1100 devpriv->dma_current_buf = devpriv->ai_buf0;
1101 }
1102 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
0a85b6f0 1103 devpriv->dma_current_buf);
a69cc3a9
FMH		 1104 }
1105
1106 release_dma_lock(flags);
1107
a351ecf3 1108 /* get any remaining samples in fifo */
a69cc3a9
FMH		 1109 das1800_handle_fifo_not_empty(dev, s);
1110
1111 return;
1112}
1113
da91b269 1114static void das1800_handle_fifo_half_full(struct comedi_device *dev,
0a85b6f0 1115 struct comedi_subdevice *s)
a69cc3a9
FMH		 1116{
1117 int numPoints = 0; /* number of points to read */
ea6d0d4c 1118 struct comedi_cmd *cmd = &s->async->cmd;
a69cc3a9
FMH		 1119
1120 numPoints = FIFO_SIZE / 2;
1121 /* if we only need some of the points */
1122 if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
1123 numPoints = devpriv->count;
1124 insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
1125 munge_data(dev, devpriv->ai_buf0, numPoints);
1126 cfc_write_array_to_buffer(s, devpriv->ai_buf0,
0a85b6f0 1127 numPoints * sizeof(devpriv->ai_buf0[0]));
a69cc3a9
FMH		 1128 if (cmd->stop_src == TRIG_COUNT)
1129 devpriv->count -= numPoints;
1130 return;
1131}
1132
da91b269 1133static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
0a85b6f0 1134 struct comedi_subdevice *s)
a69cc3a9 1135{
790c5541 1136 short dpnt;
a69cc3a9 1137 int unipolar;
ea6d0d4c 1138 struct comedi_cmd *cmd = &s->async->cmd;
a69cc3a9
FMH		 1139
1140 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1141
1142 while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
1143 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
1144 break;
1145 dpnt = inw(dev->iobase + DAS1800_FIFO);
1146 /* convert to unsigned type if we are in a bipolar mode */
1147 if (!unipolar) ;
1148 dpnt = munge_bipolar_sample(dev, dpnt);
1149 cfc_write_to_buffer(s, dpnt);
1150 if (cmd->stop_src == TRIG_COUNT)
1151 devpriv->count--;
1152 }
1153
1154 return;
1155}
1156
da91b269 1157static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
a69cc3a9
FMH		 1158{
1159 outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */
1160 outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */
1161 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */
1162 if (devpriv->dma0)
1163 disable_dma(devpriv->dma0);
1164 if (devpriv->dma1)
1165 disable_dma(devpriv->dma1);
1166 return 0;
1167}
1168
1169/* test analog input cmd */
0a85b6f0
MT		 1170static int das1800_ai_do_cmdtest(struct comedi_device *dev,
1171 struct comedi_subdevice *s,
1172 struct comedi_cmd *cmd)
a69cc3a9
FMH		 1173{
1174 int err = 0;
1175 int tmp;
1176 unsigned int tmp_arg;
1177 int i;
1178 int unipolar;
1179
1180 /* step 1: make sure trigger sources are trivially valid */
1181
1182 tmp = cmd->start_src;
1183 cmd->start_src &= TRIG_NOW | TRIG_EXT;
1184 if (!cmd->start_src || tmp != cmd->start_src)
1185 err++;
1186
1187 tmp = cmd->scan_begin_src;
1188 cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT;
1189 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
1190 err++;
1191
1192 tmp = cmd->convert_src;
1193 cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
1194 if (!cmd->convert_src || tmp != cmd->convert_src)
1195 err++;
1196
1197 tmp = cmd->scan_end_src;
1198 cmd->scan_end_src &= TRIG_COUNT;
1199 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
1200 err++;
1201
1202 tmp = cmd->stop_src;
1203 cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE;
1204 if (!cmd->stop_src || tmp != cmd->stop_src)
1205 err++;
1206
1207 if (err)
1208 return 1;
1209
1210 /* step 2: make sure trigger sources are unique and mutually compatible */
1211
a351ecf3 1212 /* uniqueness check */
a69cc3a9
FMH		 1213 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
1214 err++;
1215 if (cmd->scan_begin_src != TRIG_FOLLOW &&
0a85b6f0
MT		 1216 cmd->scan_begin_src != TRIG_TIMER &&
1217 cmd->scan_begin_src != TRIG_EXT)
a69cc3a9
FMH		 1218 err++;
1219 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
1220 err++;
1221 if (cmd->stop_src != TRIG_COUNT &&
0a85b6f0 1222 cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT)
a69cc3a9 1223 err++;
a351ecf3 1224 /* compatibility check */
a69cc3a9 1225 if (cmd->scan_begin_src != TRIG_FOLLOW &&
0a85b6f0 1226 cmd->convert_src != TRIG_TIMER)
a69cc3a9
FMH		 1227 err++;
1228
1229 if (err)
1230 return 2;
1231
1232 /* step 3: make sure arguments are trivially compatible */
1233
1234 if (cmd->start_arg != 0) {
1235 cmd->start_arg = 0;
1236 err++;
1237 }
1238 if (cmd->convert_src == TRIG_TIMER) {
1239 if (cmd->convert_arg < thisboard->ai_speed) {
1240 cmd->convert_arg = thisboard->ai_speed;
1241 err++;
1242 }
1243 }
1244 if (!cmd->chanlist_len) {
1245 cmd->chanlist_len = 1;
1246 err++;
1247 }
1248 if (cmd->scan_end_arg != cmd->chanlist_len) {
1249 cmd->scan_end_arg = cmd->chanlist_len;
1250 err++;
1251 }
1252
1253 switch (cmd->stop_src) {
1254 case TRIG_COUNT:
1255 if (!cmd->stop_arg) {
1256 cmd->stop_arg = 1;
1257 err++;
1258 }
1259 break;
1260 case TRIG_NONE:
1261 if (cmd->stop_arg != 0) {
1262 cmd->stop_arg = 0;
1263 err++;
1264 }
1265 break;
1266 default:
1267 break;
1268 }
1269
1270 if (err)
1271 return 3;
1272
1273 /* step 4: fix up any arguments */
1274
1275 if (cmd->convert_src == TRIG_TIMER) {
a351ecf3 1276 /* if we are not in burst mode */
a69cc3a9
FMH		 1277 if (cmd->scan_begin_src == TRIG_FOLLOW) {
1278 tmp_arg = cmd->convert_arg;
1279 /* calculate counter values that give desired timing */
1280 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
0a85b6f0
MT		 1281 &(devpriv->divisor1),
1282 &(devpriv->divisor2),
1283 &(cmd->convert_arg),
1284 cmd->
1285 flags & TRIG_ROUND_MASK);
a69cc3a9
FMH		 1286 if (tmp_arg != cmd->convert_arg)
1287 err++;
1288 }
a351ecf3 1289 /* if we are in burst mode */
a69cc3a9 1290 else {
a351ecf3 1291 /* check that convert_arg is compatible */
a69cc3a9
FMH		 1292 tmp_arg = cmd->convert_arg;
1293 cmd->convert_arg =
0a85b6f0
MT		 1294 burst_convert_arg(cmd->convert_arg,
1295 cmd->flags & TRIG_ROUND_MASK);
a69cc3a9
FMH		 1296 if (tmp_arg != cmd->convert_arg)
1297 err++;
1298
1299 if (cmd->scan_begin_src == TRIG_TIMER) {
a351ecf3 1300 /* if scans are timed faster than conversion rate allows */
a69cc3a9 1301 if (cmd->convert_arg * cmd->chanlist_len >
0a85b6f0 1302 cmd->scan_begin_arg) {
a69cc3a9 1303 cmd->scan_begin_arg =
0a85b6f0
MT		 1304 cmd->convert_arg *
1305 cmd->chanlist_len;
a69cc3a9
FMH		 1306 err++;
1307 }
1308 tmp_arg = cmd->scan_begin_arg;
1309 /* calculate counter values that give desired timing */
1310 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
0a85b6f0
MT		 1311 &(devpriv->
1312 divisor1),
1313 &(devpriv->
1314 divisor2),
1315 &(cmd->
1316 scan_begin_arg),
1317 cmd->
1318 flags &
1319 TRIG_ROUND_MASK);
a69cc3a9
FMH		 1320 if (tmp_arg != cmd->scan_begin_arg)
1321 err++;
1322 }
1323 }
1324 }
1325
1326 if (err)
1327 return 4;
1328
a351ecf3 1329 /* make sure user is not trying to mix unipolar and bipolar ranges */
a69cc3a9
FMH		 1330 if (cmd->chanlist) {
1331 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
1332 for (i = 1; i < cmd->chanlist_len; i++) {
1333 if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
1334 comedi_error(dev,
0a85b6f0 1335 "unipolar and bipolar ranges cannot be mixed in the chanlist");
a69cc3a9
FMH		 1336 err++;
1337 break;
1338 }
1339 }
1340 }
1341
1342 if (err)
1343 return 5;
1344
1345 return 0;
1346}
1347
1348/* analog input cmd interface */
1349
a351ecf3 1350/* first, some utility functions used in the main ai_do_cmd() */
a69cc3a9 1351
a351ecf3 1352/* returns appropriate bits for control register a, depending on command */
ea6d0d4c 1353static int control_a_bits(struct comedi_cmd cmd)
a69cc3a9
FMH		 1354{
1355 int control_a;
1356
a351ecf3 1357 control_a = FFEN; /* enable fifo */
a69cc3a9
FMH		 1358 if (cmd.stop_src == TRIG_EXT) {
1359 control_a |= ATEN;
1360 }
1361 switch (cmd.start_src) {
1362 case TRIG_EXT:
1363 control_a |= TGEN | CGSL;
1364 break;
1365 case TRIG_NOW:
1366 control_a |= CGEN;
1367 break;
1368 default:
1369 break;
1370 }
1371
1372 return control_a;
1373}
1374
a351ecf3 1375/* returns appropriate bits for control register c, depending on command */
ea6d0d4c 1376static int control_c_bits(struct comedi_cmd cmd)
a69cc3a9
FMH		 1377{
1378 int control_c;
1379 int aref;
1380
1381 /* set clock source to internal or external, select analog reference,
1382 * select unipolar / bipolar
1383 */
1384 aref = CR_AREF(cmd.chanlist[0]);
a351ecf3 1385 control_c = UQEN; /* enable upper qram addresses */
a69cc3a9
FMH		 1386 if (aref != AREF_DIFF)
1387 control_c |= SD;
1388 if (aref == AREF_COMMON)
1389 control_c |= CMEN;
1390 /* if a unipolar range was selected */
1391 if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR)
1392 control_c |= UB;
1393 switch (cmd.scan_begin_src) {
a351ecf3 1394 case TRIG_FOLLOW: /* not in burst mode */
a69cc3a9
FMH		 1395 switch (cmd.convert_src) {
1396 case TRIG_TIMER:
1397 /* trig on cascaded counters */
1398 control_c |= IPCLK;
1399 break;
1400 case TRIG_EXT:
1401 /* trig on falling edge of external trigger */
1402 control_c |= XPCLK;
1403 break;
1404 default:
1405 break;
1406 }
1407 break;
1408 case TRIG_TIMER:
a351ecf3 1409 /* burst mode with internal pacer clock */
a69cc3a9
FMH		 1410 control_c |= BMDE | IPCLK;
1411 break;
1412 case TRIG_EXT:
a351ecf3 1413 /* burst mode with external trigger */
a69cc3a9
FMH		 1414 control_c |= BMDE | XPCLK;
1415 break;
1416 default:
1417 break;
1418 }
1419
1420 return control_c;
1421}
1422
a351ecf3 1423/* sets up counters */
da91b269 1424static int setup_counters(struct comedi_device *dev, struct comedi_cmd cmd)
a69cc3a9 1425{
a351ecf3 1426 /* setup cascaded counters for conversion/scan frequency */
a69cc3a9 1427 switch (cmd.scan_begin_src) {
a351ecf3 1428 case TRIG_FOLLOW: /* not in burst mode */
a69cc3a9
FMH		 1429 if (cmd.convert_src == TRIG_TIMER) {
1430 /* set conversion frequency */
1431 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
0a85b6f0
MT		 1432 &(devpriv->divisor1),
1433 &(devpriv->divisor2),
1434 &(cmd.convert_arg),
1435 cmd.
1436 flags & TRIG_ROUND_MASK);
a69cc3a9
FMH		 1437 if (das1800_set_frequency(dev) < 0) {
1438 return -1;
1439 }
1440 }
1441 break;
a351ecf3 1442 case TRIG_TIMER: /* in burst mode */
a69cc3a9
FMH		 1443 /* set scan frequency */
1444 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1),
0a85b6f0
MT		 1445 &(devpriv->divisor2),
1446 &(cmd.scan_begin_arg),
1447 cmd.flags & TRIG_ROUND_MASK);
a69cc3a9
FMH		 1448 if (das1800_set_frequency(dev) < 0) {
1449 return -1;
1450 }
1451 break;
1452 default:
1453 break;
1454 }
1455
a351ecf3 1456 /* setup counter 0 for 'about triggering' */
a69cc3a9 1457 if (cmd.stop_src == TRIG_EXT) {
a351ecf3 1458 /* load counter 0 in mode 0 */
a69cc3a9
FMH		 1459 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1460 }
1461
1462 return 0;
1463}
1464
a351ecf3 1465/* sets up dma */
da91b269 1466static void setup_dma(struct comedi_device *dev, struct comedi_cmd cmd)
a69cc3a9
FMH		 1467{
1468 unsigned long lock_flags;
1469 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1470
1471 if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1472 return;
1473
1474 /* determine a reasonable dma transfer size */
1475 devpriv->dma_transfer_size = suggest_transfer_size(&cmd);
1476 lock_flags = claim_dma_lock();
1477 disable_dma(devpriv->dma0);
1478 /* clear flip-flop to make sure 2-byte registers for
1479 * count and address get set correctly */
1480 clear_dma_ff(devpriv->dma0);
1481 set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
a351ecf3 1482 /* set appropriate size of transfer */
a69cc3a9
FMH		 1483 set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1484 devpriv->dma_current = devpriv->dma0;
1485 devpriv->dma_current_buf = devpriv->ai_buf0;
1486 enable_dma(devpriv->dma0);
a351ecf3 1487 /* set up dual dma if appropriate */
a69cc3a9
FMH		 1488 if (dual_dma) {
1489 disable_dma(devpriv->dma1);
1490 /* clear flip-flop to make sure 2-byte registers for
1491 * count and address get set correctly */
1492 clear_dma_ff(devpriv->dma1);
1493 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
a351ecf3 1494 /* set appropriate size of transfer */
a69cc3a9
FMH		 1495 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1496 enable_dma(devpriv->dma1);
1497 }
1498 release_dma_lock(lock_flags);
1499
1500 return;
1501}
1502
a351ecf3 1503/* programs channel/gain list into card */
da91b269 1504static void program_chanlist(struct comedi_device *dev, struct comedi_cmd cmd)
a69cc3a9
FMH		 1505{
1506 int i, n, chan_range;
1507 unsigned long irq_flags;
a351ecf3 1508 const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */
a69cc3a9
FMH		 1509 const int range_bitshift = 8;
1510
1511 n = cmd.chanlist_len;
a351ecf3 1512 /* spinlock protects indirect addressing */
5f74ea14 1513 spin_lock_irqsave(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1514 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1515 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */
1516 /* make channel / gain list */
1517 for (i = 0; i < n; i++) {
1518 chan_range =
0a85b6f0
MT		 1519 CR_CHAN(cmd.
1520 chanlist[i]) | ((CR_RANGE(cmd.chanlist[i]) &
1521 range_mask) << range_bitshift);
a69cc3a9
FMH		 1522 outw(chan_range, dev->iobase + DAS1800_QRAM);
1523 }
1524 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
5f74ea14 1525 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1526
1527 return;
1528}
1529
a351ecf3 1530/* analog input do_cmd */
0a85b6f0
MT		 1531static int das1800_ai_do_cmd(struct comedi_device *dev,
1532 struct comedi_subdevice *s)
a69cc3a9
FMH		 1533{
1534 int ret;
1535 int control_a, control_c;
d163679c 1536 struct comedi_async *async = s->async;
ea6d0d4c 1537 struct comedi_cmd cmd = async->cmd;
a69cc3a9
FMH		 1538
1539 if (!dev->irq) {
1540 comedi_error(dev,
0a85b6f0 1541 "no irq assigned for das-1800, cannot do hardware conversions");
a69cc3a9
FMH		 1542 return -1;
1543 }
1544
1545 /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1546 * (because dma in handler is unsafe at hard real-time priority) */
1547 if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT)) {
1548 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1549 } else {
1550 devpriv->irq_dma_bits |= devpriv->dma_bits;
1551 }
a351ecf3 1552 /* interrupt on end of conversion for TRIG_WAKE_EOS */
a69cc3a9 1553 if (cmd.flags & TRIG_WAKE_EOS) {
a351ecf3 1554 /* interrupt fifo not empty */
a69cc3a9
FMH		 1555 devpriv->irq_dma_bits &= ~FIMD;
1556 } else {
a351ecf3 1557 /* interrupt fifo half full */
a69cc3a9
FMH		 1558 devpriv->irq_dma_bits |= FIMD;
1559 }
a351ecf3 1560 /* determine how many conversions we need */
a69cc3a9
FMH		 1561 if (cmd.stop_src == TRIG_COUNT) {
1562 devpriv->count = cmd.stop_arg * cmd.chanlist_len;
1563 }
1564
1565 das1800_cancel(dev, s);
1566
a351ecf3 1567 /* determine proper bits for control registers */
a69cc3a9
FMH		 1568 control_a = control_a_bits(cmd);
1569 control_c = control_c_bits(cmd);
1570
1571 /* setup card and start */
1572 program_chanlist(dev, cmd);
1573 ret = setup_counters(dev, cmd);
1574 if (ret < 0) {
1575 comedi_error(dev, "Error setting up counters");
1576 return ret;
1577 }
1578 setup_dma(dev, cmd);
1579 outb(control_c, dev->iobase + DAS1800_CONTROL_C);
a351ecf3 1580 /* set conversion rate and length for burst mode */
a69cc3a9 1581 if (control_c & BMDE) {
a351ecf3 1582 /* program conversion period with number of microseconds minus 1 */
a69cc3a9 1583 outb(cmd.convert_arg / 1000 - 1,
0a85b6f0 1584 dev->iobase + DAS1800_BURST_RATE);
a69cc3a9
FMH		 1585 outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1586 }
a351ecf3 1587 outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */
a69cc3a9
FMH		 1588 outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */
1589 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1590
1591 return 0;
1592}
1593
1594/* read analog input */
0a85b6f0
MT		 1595static int das1800_ai_rinsn(struct comedi_device *dev,
1596 struct comedi_subdevice *s,
1597 struct comedi_insn *insn, unsigned int *data)
a69cc3a9
FMH		 1598{
1599 int i, n;
1600 int chan, range, aref, chan_range;
1601 int timeout = 1000;
1602 short dpnt;
1603 int conv_flags = 0;
1604 unsigned long irq_flags;
1605
1606 /* set up analog reference and unipolar / bipolar mode */
1607 aref = CR_AREF(insn->chanspec);
1608 conv_flags |= UQEN;
1609 if (aref != AREF_DIFF)
1610 conv_flags |= SD;
1611 if (aref == AREF_COMMON)
1612 conv_flags |= CMEN;
1613 /* if a unipolar range was selected */
1614 if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1615 conv_flags |= UB;
1616
1617 outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */
1618 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1619 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */
1620 outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1621
1622 chan = CR_CHAN(insn->chanspec);
1623 /* mask of unipolar/bipolar bit from range */
1624 range = CR_RANGE(insn->chanspec) & 0x3;
1625 chan_range = chan | (range << 8);
5f74ea14 1626 spin_lock_irqsave(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1627 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1628 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */
1629 outw(chan_range, dev->iobase + DAS1800_QRAM);
1630 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1631 outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */
1632
1633 for (n = 0; n < insn->n; n++) {
1634 /* trigger conversion */
1635 outb(0, dev->iobase + DAS1800_FIFO);
1636 for (i = 0; i < timeout; i++) {
1637 if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1638 break;
1639 }
1640 if (i == timeout) {
1641 comedi_error(dev, "timeout");
1642 return -ETIME;
1643 }
1644 dpnt = inw(dev->iobase + DAS1800_FIFO);
1645 /* shift data to offset binary for bipolar ranges */
1646 if ((conv_flags & UB) == 0)
1647 dpnt += 1 << (thisboard->resolution - 1);
1648 data[n] = dpnt;
1649 }
5f74ea14 1650 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1651
1652 return n;
1653}
1654
1655/* writes to an analog output channel */
0a85b6f0
MT		 1656static int das1800_ao_winsn(struct comedi_device *dev,
1657 struct comedi_subdevice *s,
1658 struct comedi_insn *insn, unsigned int *data)
a69cc3a9
FMH		 1659{
1660 int chan = CR_CHAN(insn->chanspec);
a351ecf3 1661/* int range = CR_RANGE(insn->chanspec); */
a69cc3a9
FMH		 1662 int update_chan = thisboard->ao_n_chan - 1;
1663 short output;
1664 unsigned long irq_flags;
1665
a351ecf3 1666 /* card expects two's complement data */
a69cc3a9 1667 output = data[0] - (1 << (thisboard->resolution - 1));
a351ecf3 1668 /* if the write is to the 'update' channel, we need to remember its value */
a69cc3a9
FMH		 1669 if (chan == update_chan)
1670 devpriv->ao_update_bits = output;
a351ecf3 1671 /* write to channel */
5f74ea14 1672 spin_lock_irqsave(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1673 outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */
1674 outw(output, dev->iobase + DAS1800_DAC);
a351ecf3 1675 /* now we need to write to 'update' channel to update all dac channels */
a69cc3a9
FMH		 1676 if (chan != update_chan) {
1677 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */
1678 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1679 }
5f74ea14 1680 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
a69cc3a9
FMH		 1681
1682 return 1;
1683}
1684
1685/* reads from digital input channels */
0a85b6f0
MT		 1686static int das1800_di_rbits(struct comedi_device *dev,
1687 struct comedi_subdevice *s,
1688 struct comedi_insn *insn, unsigned int *data)
a69cc3a9
FMH		 1689{
1690
1691 data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1692 data[0] = 0;
1693
1694 return 2;
1695}
1696
1697/* writes to digital output channels */
0a85b6f0
MT		 1698static int das1800_do_wbits(struct comedi_device *dev,
1699 struct comedi_subdevice *s,
1700 struct comedi_insn *insn, unsigned int *data)
a69cc3a9 1701{
790c5541 1702 unsigned int wbits;
a69cc3a9 1703
a351ecf3 1704 /* only set bits that have been masked */
a69cc3a9
FMH		 1705 data[0] &= (1 << s->n_chan) - 1;
1706 wbits = devpriv->do_bits;
1707 wbits &= ~data[0];
1708 wbits |= data[0] & data[1];
1709 devpriv->do_bits = wbits;
1710
1711 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1712
1713 data[1] = devpriv->do_bits;
1714
1715 return 2;
1716}
1717
1718/* loads counters with divisor1, divisor2 from private structure */
da91b269 1719static int das1800_set_frequency(struct comedi_device *dev)
a69cc3a9
FMH		 1720{
1721 int err = 0;
1722
a351ecf3 1723 /* counter 1, mode 2 */
a69cc3a9 1724 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
0a85b6f0 1725 2))
a69cc3a9 1726 err++;
a351ecf3 1727 /* counter 2, mode 2 */
a69cc3a9 1728 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
0a85b6f0 1729 2))
a69cc3a9
FMH		 1730 err++;
1731 if (err)
1732 return -1;
1733
1734 return 0;
1735}
1736
1737/* converts requested conversion timing to timing compatible with
1738 * hardware, used only when card is in 'burst mode'
1739 */
1740static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
1741{
1742 unsigned int micro_sec;
1743
a351ecf3 1744 /* in burst mode, the maximum conversion time is 64 microseconds */
a69cc3a9
FMH		 1745 if (convert_arg > 64000)
1746 convert_arg = 64000;
1747
a351ecf3 1748 /* the conversion time must be an integral number of microseconds */
a69cc3a9
FMH		 1749 switch (round_mode) {
1750 case TRIG_ROUND_NEAREST:
1751 default:
1752 micro_sec = (convert_arg + 500) / 1000;
1753 break;
1754 case TRIG_ROUND_DOWN:
1755 micro_sec = convert_arg / 1000;
1756 break;
1757 case TRIG_ROUND_UP:
1758 micro_sec = (convert_arg - 1) / 1000 + 1;
1759 break;
1760 }
1761
a351ecf3 1762 /* return number of nanoseconds */
a69cc3a9
FMH		 1763 return micro_sec * 1000;
1764}
1765
a351ecf3 1766/* utility function that suggests a dma transfer size based on the conversion period 'ns' */
da91b269 1767static unsigned int suggest_transfer_size(struct comedi_cmd *cmd)
a69cc3a9
FMH		 1768{
1769 unsigned int size = DMA_BUF_SIZE;
a351ecf3
BP		 1770 static const int sample_size = 2; /* size in bytes of one sample from board */
1771 unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */
1772 unsigned int max_size; /* maximum size we will allow for a transfer */
a69cc3a9 1773
a351ecf3 1774 /* make dma buffer fill in 0.3 seconds for timed modes */
a69cc3a9 1775 switch (cmd->scan_begin_src) {
a351ecf3 1776 case TRIG_FOLLOW: /* not in burst mode */
a69cc3a9
FMH		 1777 if (cmd->convert_src == TRIG_TIMER)
1778 size = (fill_time / cmd->convert_arg) * sample_size;
1779 break;
1780 case TRIG_TIMER:
1781 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
0a85b6f0 1782 sample_size;
a69cc3a9
FMH		 1783 break;
1784 default:
1785 size = DMA_BUF_SIZE;
1786 break;
1787 }
1788
a351ecf3 1789 /* set a minimum and maximum size allowed */
a69cc3a9 1790 max_size = DMA_BUF_SIZE;
a351ecf3 1791 /* if we are taking limited number of conversions, limit transfer size to that */
a69cc3a9 1792 if (cmd->stop_src == TRIG_COUNT &&
0a85b6f0 1793 cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
a69cc3a9
FMH		 1794 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1795
1796 if (size > max_size)
1797 size = max_size;
1798 if (size < sample_size)
1799 size = sample_size;
1800
1801 return size;
1802}
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