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staging: comedi: das16m1: remove subdevice pointer math
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / comedi / drivers / das1800.c
1 /*
2 comedi/drivers/das1800.c
3 Driver for Keitley das1700/das1800 series boards
4 Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net>
5
6 COMEDI - Linux Control and Measurement Device Interface
7 Copyright (C) 2000 David A. Schleef <ds@schleef.org>
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22
23 ************************************************************************
24 */
25 /*
26 Driver: das1800
27 Description: Keithley Metrabyte DAS1800 (& compatibles)
28 Author: Frank Mori Hess <fmhess@users.sourceforge.net>
29 Devices: [Keithley Metrabyte] DAS-1701ST (das-1701st),
30 DAS-1701ST-DA (das-1701st-da), DAS-1701/AO (das-1701ao),
31 DAS-1702ST (das-1702st), DAS-1702ST-DA (das-1702st-da),
32 DAS-1702HR (das-1702hr), DAS-1702HR-DA (das-1702hr-da),
33 DAS-1702/AO (das-1702ao), DAS-1801ST (das-1801st),
34 DAS-1801ST-DA (das-1801st-da), DAS-1801HC (das-1801hc),
35 DAS-1801AO (das-1801ao), DAS-1802ST (das-1802st),
36 DAS-1802ST-DA (das-1802st-da), DAS-1802HR (das-1802hr),
37 DAS-1802HR-DA (das-1802hr-da), DAS-1802HC (das-1802hc),
38 DAS-1802AO (das-1802ao)
39 Status: works
40
41 The waveform analog output on the 'ao' cards is not supported.
42 If you need it, send me (Frank Hess) an email.
43
44 Configuration options:
45 [0] - I/O port base address
46 [1] - IRQ (optional, required for timed or externally triggered conversions)
47 [2] - DMA0 (optional, requires irq)
48 [3] - DMA1 (optional, requires irq and dma0)
49 */
50 /*
51
52 This driver supports the following Keithley boards:
53
54 das-1701st
55 das-1701st-da
56 das-1701ao
57 das-1702st
58 das-1702st-da
59 das-1702hr
60 das-1702hr-da
61 das-1702ao
62 das-1801st
63 das-1801st-da
64 das-1801hc
65 das-1801ao
66 das-1802st
67 das-1802st-da
68 das-1802hr
69 das-1802hr-da
70 das-1802hc
71 das-1802ao
72
73 Options:
74 [0] - base io address
75 [1] - irq (optional, required for timed or externally triggered conversions)
76 [2] - dma0 (optional, requires irq)
77 [3] - dma1 (optional, requires irq and dma0)
78
79 irq can be omitted, although the cmd interface will not work without it.
80
81 analog input cmd triggers supported:
82 start_src: TRIG_NOW | TRIG_EXT
83 scan_begin_src: TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT
84 scan_end_src: TRIG_COUNT
85 convert_src: TRIG_TIMER | TRIG_EXT (TRIG_EXT requires scan_begin_src == TRIG_FOLLOW)
86 stop_src: TRIG_COUNT | TRIG_EXT | TRIG_NONE
87
88 scan_begin_src triggers TRIG_TIMER and TRIG_EXT use the card's
89 'burst mode' which limits the valid conversion time to 64 microseconds
90 (convert_arg <= 64000). This limitation does not apply if scan_begin_src
91 is TRIG_FOLLOW.
92
93 NOTES:
94 Only the DAS-1801ST has been tested by me.
95 Unipolar and bipolar ranges cannot be mixed in the channel/gain list.
96
97 TODO:
98 Make it automatically allocate irq and dma channels if they are not specified
99 Add support for analog out on 'ao' cards
100 read insn for analog out
101 */
102
103 #include <linux/interrupt.h>
104 #include <linux/slab.h>
105 #include <linux/io.h>
106 #include "../comedidev.h"
107
108 #include <linux/ioport.h>
109 #include <asm/dma.h>
110
111 #include "8253.h"
112 #include "comedi_fc.h"
113
114 /* misc. defines */
115 #define DAS1800_SIZE 16 /* uses 16 io addresses */
116 #define FIFO_SIZE 1024 /* 1024 sample fifo */
117 #define TIMER_BASE 200 /* 5 Mhz master clock */
118 #define UNIPOLAR 0x4 /* bit that determines whether input range is uni/bipolar */
119 #define DMA_BUF_SIZE 0x1ff00 /* size in bytes of dma buffers */
120
121 /* Registers for the das1800 */
122 #define DAS1800_FIFO 0x0
123 #define DAS1800_QRAM 0x0
124 #define DAS1800_DAC 0x0
125 #define DAS1800_SELECT 0x2
126 #define ADC 0x0
127 #define QRAM 0x1
128 #define DAC(a) (0x2 + a)
129 #define DAS1800_DIGITAL 0x3
130 #define DAS1800_CONTROL_A 0x4
131 #define FFEN 0x1
132 #define CGEN 0x4
133 #define CGSL 0x8
134 #define TGEN 0x10
135 #define TGSL 0x20
136 #define ATEN 0x80
137 #define DAS1800_CONTROL_B 0x5
138 #define DMA_CH5 0x1
139 #define DMA_CH6 0x2
140 #define DMA_CH7 0x3
141 #define DMA_CH5_CH6 0x5
142 #define DMA_CH6_CH7 0x6
143 #define DMA_CH7_CH5 0x7
144 #define DMA_ENABLED 0x3 /* mask used to determine if dma is enabled */
145 #define DMA_DUAL 0x4
146 #define IRQ3 0x8
147 #define IRQ5 0x10
148 #define IRQ7 0x18
149 #define IRQ10 0x28
150 #define IRQ11 0x30
151 #define IRQ15 0x38
152 #define FIMD 0x40
153 #define DAS1800_CONTROL_C 0X6
154 #define IPCLK 0x1
155 #define XPCLK 0x3
156 #define BMDE 0x4
157 #define CMEN 0x8
158 #define UQEN 0x10
159 #define SD 0x40
160 #define UB 0x80
161 #define DAS1800_STATUS 0x7
162 /* bits that prevent interrupt status bits (and CVEN) from being cleared on write */
163 #define CLEAR_INTR_MASK (CVEN_MASK | 0x1f)
164 #define INT 0x1
165 #define DMATC 0x2
166 #define CT0TC 0x8
167 #define OVF 0x10
168 #define FHF 0x20
169 #define FNE 0x40
170 #define CVEN_MASK 0x40 /* masks CVEN on write */
171 #define CVEN 0x80
172 #define DAS1800_BURST_LENGTH 0x8
173 #define DAS1800_BURST_RATE 0x9
174 #define DAS1800_QRAM_ADDRESS 0xa
175 #define DAS1800_COUNTER 0xc
176
177 #define IOBASE2 0x400 /* offset of additional ioports used on 'ao' cards */
178
179 enum {
180 das1701st, das1701st_da, das1702st, das1702st_da, das1702hr,
181 das1702hr_da,
182 das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da,
183 das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao
184 };
185
186 /* analog input ranges */
187 static const struct comedi_lrange range_ai_das1801 = {
188 8,
189 {
190 RANGE(-5, 5),
191 RANGE(-1, 1),
192 RANGE(-0.1, 0.1),
193 RANGE(-0.02, 0.02),
194 RANGE(0, 5),
195 RANGE(0, 1),
196 RANGE(0, 0.1),
197 RANGE(0, 0.02),
198 }
199 };
200
201 static const struct comedi_lrange range_ai_das1802 = {
202 8,
203 {
204 RANGE(-10, 10),
205 RANGE(-5, 5),
206 RANGE(-2.5, 2.5),
207 RANGE(-1.25, 1.25),
208 RANGE(0, 10),
209 RANGE(0, 5),
210 RANGE(0, 2.5),
211 RANGE(0, 1.25),
212 }
213 };
214
215 struct das1800_board {
216 const char *name;
217 int ai_speed; /* max conversion period in nanoseconds */
218 int resolution; /* bits of ai resolution */
219 int qram_len; /* length of card's channel / gain queue */
220 int common; /* supports AREF_COMMON flag */
221 int do_n_chan; /* number of digital output channels */
222 int ao_ability; /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */
223 int ao_n_chan; /* number of analog out channels */
224 const struct comedi_lrange *range_ai; /* available input ranges */
225 };
226
227 /* Warning: the maximum conversion speeds listed below are
228 * not always achievable depending on board setup (see
229 * user manual.)
230 */
231 static const struct das1800_board das1800_boards[] = {
232 {
233 .name = "das-1701st",
234 .ai_speed = 6250,
235 .resolution = 12,
236 .qram_len = 256,
237 .common = 1,
238 .do_n_chan = 4,
239 .ao_ability = 0,
240 .ao_n_chan = 0,
241 .range_ai = &range_ai_das1801,
242 },
243 {
244 .name = "das-1701st-da",
245 .ai_speed = 6250,
246 .resolution = 12,
247 .qram_len = 256,
248 .common = 1,
249 .do_n_chan = 4,
250 .ao_ability = 1,
251 .ao_n_chan = 4,
252 .range_ai = &range_ai_das1801,
253 },
254 {
255 .name = "das-1702st",
256 .ai_speed = 6250,
257 .resolution = 12,
258 .qram_len = 256,
259 .common = 1,
260 .do_n_chan = 4,
261 .ao_ability = 0,
262 .ao_n_chan = 0,
263 .range_ai = &range_ai_das1802,
264 },
265 {
266 .name = "das-1702st-da",
267 .ai_speed = 6250,
268 .resolution = 12,
269 .qram_len = 256,
270 .common = 1,
271 .do_n_chan = 4,
272 .ao_ability = 1,
273 .ao_n_chan = 4,
274 .range_ai = &range_ai_das1802,
275 },
276 {
277 .name = "das-1702hr",
278 .ai_speed = 20000,
279 .resolution = 16,
280 .qram_len = 256,
281 .common = 1,
282 .do_n_chan = 4,
283 .ao_ability = 0,
284 .ao_n_chan = 0,
285 .range_ai = &range_ai_das1802,
286 },
287 {
288 .name = "das-1702hr-da",
289 .ai_speed = 20000,
290 .resolution = 16,
291 .qram_len = 256,
292 .common = 1,
293 .do_n_chan = 4,
294 .ao_ability = 1,
295 .ao_n_chan = 2,
296 .range_ai = &range_ai_das1802,
297 },
298 {
299 .name = "das-1701ao",
300 .ai_speed = 6250,
301 .resolution = 12,
302 .qram_len = 256,
303 .common = 1,
304 .do_n_chan = 4,
305 .ao_ability = 2,
306 .ao_n_chan = 2,
307 .range_ai = &range_ai_das1801,
308 },
309 {
310 .name = "das-1702ao",
311 .ai_speed = 6250,
312 .resolution = 12,
313 .qram_len = 256,
314 .common = 1,
315 .do_n_chan = 4,
316 .ao_ability = 2,
317 .ao_n_chan = 2,
318 .range_ai = &range_ai_das1802,
319 },
320 {
321 .name = "das-1801st",
322 .ai_speed = 3000,
323 .resolution = 12,
324 .qram_len = 256,
325 .common = 1,
326 .do_n_chan = 4,
327 .ao_ability = 0,
328 .ao_n_chan = 0,
329 .range_ai = &range_ai_das1801,
330 },
331 {
332 .name = "das-1801st-da",
333 .ai_speed = 3000,
334 .resolution = 12,
335 .qram_len = 256,
336 .common = 1,
337 .do_n_chan = 4,
338 .ao_ability = 0,
339 .ao_n_chan = 4,
340 .range_ai = &range_ai_das1801,
341 },
342 {
343 .name = "das-1802st",
344 .ai_speed = 3000,
345 .resolution = 12,
346 .qram_len = 256,
347 .common = 1,
348 .do_n_chan = 4,
349 .ao_ability = 0,
350 .ao_n_chan = 0,
351 .range_ai = &range_ai_das1802,
352 },
353 {
354 .name = "das-1802st-da",
355 .ai_speed = 3000,
356 .resolution = 12,
357 .qram_len = 256,
358 .common = 1,
359 .do_n_chan = 4,
360 .ao_ability = 1,
361 .ao_n_chan = 4,
362 .range_ai = &range_ai_das1802,
363 },
364 {
365 .name = "das-1802hr",
366 .ai_speed = 10000,
367 .resolution = 16,
368 .qram_len = 256,
369 .common = 1,
370 .do_n_chan = 4,
371 .ao_ability = 0,
372 .ao_n_chan = 0,
373 .range_ai = &range_ai_das1802,
374 },
375 {
376 .name = "das-1802hr-da",
377 .ai_speed = 10000,
378 .resolution = 16,
379 .qram_len = 256,
380 .common = 1,
381 .do_n_chan = 4,
382 .ao_ability = 1,
383 .ao_n_chan = 2,
384 .range_ai = &range_ai_das1802,
385 },
386 {
387 .name = "das-1801hc",
388 .ai_speed = 3000,
389 .resolution = 12,
390 .qram_len = 64,
391 .common = 0,
392 .do_n_chan = 8,
393 .ao_ability = 1,
394 .ao_n_chan = 2,
395 .range_ai = &range_ai_das1801,
396 },
397 {
398 .name = "das-1802hc",
399 .ai_speed = 3000,
400 .resolution = 12,
401 .qram_len = 64,
402 .common = 0,
403 .do_n_chan = 8,
404 .ao_ability = 1,
405 .ao_n_chan = 2,
406 .range_ai = &range_ai_das1802,
407 },
408 {
409 .name = "das-1801ao",
410 .ai_speed = 3000,
411 .resolution = 12,
412 .qram_len = 256,
413 .common = 1,
414 .do_n_chan = 4,
415 .ao_ability = 2,
416 .ao_n_chan = 2,
417 .range_ai = &range_ai_das1801,
418 },
419 {
420 .name = "das-1802ao",
421 .ai_speed = 3000,
422 .resolution = 12,
423 .qram_len = 256,
424 .common = 1,
425 .do_n_chan = 4,
426 .ao_ability = 2,
427 .ao_n_chan = 2,
428 .range_ai = &range_ai_das1802,
429 },
430 };
431
432 /*
433 * Useful for shorthand access to the particular board structure
434 */
435 #define thisboard ((const struct das1800_board *)dev->board_ptr)
436
437 struct das1800_private {
438 volatile unsigned int count; /* number of data points left to be taken */
439 unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */
440 unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */
441 int do_bits; /* digital output bits */
442 int irq_dma_bits; /* bits for control register b */
443 /* dma bits for control register b, stored so that dma can be
444 * turned on and off */
445 int dma_bits;
446 unsigned int dma0; /* dma channels used */
447 unsigned int dma1;
448 volatile unsigned int dma_current; /* dma channel currently in use */
449 uint16_t *ai_buf0; /* pointers to dma buffers */
450 uint16_t *ai_buf1;
451 uint16_t *dma_current_buf; /* pointer to dma buffer currently being used */
452 unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
453 unsigned long iobase2; /* secondary io address used for analog out on 'ao' boards */
454 short ao_update_bits; /* remembers the last write to the 'update' dac */
455 };
456
457 #define devpriv ((struct das1800_private *)dev->private)
458
459 /* analog out range for boards with basic analog out */
460 static const struct comedi_lrange range_ao_1 = {
461 1,
462 {
463 RANGE(-10, 10),
464 }
465 };
466
467 /* analog out range for 'ao' boards */
468 /*
469 static const struct comedi_lrange range_ao_2 = {
470 2,
471 {
472 RANGE(-10, 10),
473 RANGE(-5, 5),
474 }
475 };
476 */
477
478 static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
479 uint16_t sample)
480 {
481 sample += 1 << (thisboard->resolution - 1);
482 return sample;
483 }
484
485 static void munge_data(struct comedi_device *dev, uint16_t * array,
486 unsigned int num_elements)
487 {
488 unsigned int i;
489 int unipolar;
490
491 /* see if card is using a unipolar or bipolar range so we can munge data correctly */
492 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
493
494 /* convert to unsigned type if we are in a bipolar mode */
495 if (!unipolar) {
496 for (i = 0; i < num_elements; i++)
497 array[i] = munge_bipolar_sample(dev, array[i]);
498 }
499 }
500
501 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
502 struct comedi_subdevice *s)
503 {
504 int numPoints = 0; /* number of points to read */
505 struct comedi_cmd *cmd = &s->async->cmd;
506
507 numPoints = FIFO_SIZE / 2;
508 /* if we only need some of the points */
509 if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
510 numPoints = devpriv->count;
511 insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
512 munge_data(dev, devpriv->ai_buf0, numPoints);
513 cfc_write_array_to_buffer(s, devpriv->ai_buf0,
514 numPoints * sizeof(devpriv->ai_buf0[0]));
515 if (cmd->stop_src == TRIG_COUNT)
516 devpriv->count -= numPoints;
517 return;
518 }
519
520 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
521 struct comedi_subdevice *s)
522 {
523 short dpnt;
524 int unipolar;
525 struct comedi_cmd *cmd = &s->async->cmd;
526
527 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
528
529 while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
530 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
531 break;
532 dpnt = inw(dev->iobase + DAS1800_FIFO);
533 /* convert to unsigned type if we are in a bipolar mode */
534 if (!unipolar)
535 ;
536 dpnt = munge_bipolar_sample(dev, dpnt);
537 cfc_write_to_buffer(s, dpnt);
538 if (cmd->stop_src == TRIG_COUNT)
539 devpriv->count--;
540 }
541
542 return;
543 }
544
545 /* Utility function used by das1800_flush_dma() and das1800_handle_dma().
546 * Assumes dma lock is held */
547 static void das1800_flush_dma_channel(struct comedi_device *dev,
548 struct comedi_subdevice *s,
549 unsigned int channel, uint16_t *buffer)
550 {
551 unsigned int num_bytes, num_samples;
552 struct comedi_cmd *cmd = &s->async->cmd;
553
554 disable_dma(channel);
555
556 /* clear flip-flop to make sure 2-byte registers
557 * get set correctly */
558 clear_dma_ff(channel);
559
560 /* figure out how many points to read */
561 num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
562 num_samples = num_bytes / sizeof(short);
563
564 /* if we only need some of the points */
565 if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
566 num_samples = devpriv->count;
567
568 munge_data(dev, buffer, num_samples);
569 cfc_write_array_to_buffer(s, buffer, num_bytes);
570 if (s->async->cmd.stop_src == TRIG_COUNT)
571 devpriv->count -= num_samples;
572
573 return;
574 }
575
576 /* flushes remaining data from board when external trigger has stopped acquisition
577 * and we are using dma transfers */
578 static void das1800_flush_dma(struct comedi_device *dev,
579 struct comedi_subdevice *s)
580 {
581 unsigned long flags;
582 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
583
584 flags = claim_dma_lock();
585 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
586 devpriv->dma_current_buf);
587
588 if (dual_dma) {
589 /* switch to other channel and flush it */
590 if (devpriv->dma_current == devpriv->dma0) {
591 devpriv->dma_current = devpriv->dma1;
592 devpriv->dma_current_buf = devpriv->ai_buf1;
593 } else {
594 devpriv->dma_current = devpriv->dma0;
595 devpriv->dma_current_buf = devpriv->ai_buf0;
596 }
597 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
598 devpriv->dma_current_buf);
599 }
600
601 release_dma_lock(flags);
602
603 /* get any remaining samples in fifo */
604 das1800_handle_fifo_not_empty(dev, s);
605
606 return;
607 }
608
609 static void das1800_handle_dma(struct comedi_device *dev,
610 struct comedi_subdevice *s, unsigned int status)
611 {
612 unsigned long flags;
613 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
614
615 flags = claim_dma_lock();
616 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
617 devpriv->dma_current_buf);
618 /* re-enable dma channel */
619 set_dma_addr(devpriv->dma_current,
620 virt_to_bus(devpriv->dma_current_buf));
621 set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
622 enable_dma(devpriv->dma_current);
623 release_dma_lock(flags);
624
625 if (status & DMATC) {
626 /* clear DMATC interrupt bit */
627 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
628 /* switch dma channels for next time, if appropriate */
629 if (dual_dma) {
630 /* read data from the other channel next time */
631 if (devpriv->dma_current == devpriv->dma0) {
632 devpriv->dma_current = devpriv->dma1;
633 devpriv->dma_current_buf = devpriv->ai_buf1;
634 } else {
635 devpriv->dma_current = devpriv->dma0;
636 devpriv->dma_current_buf = devpriv->ai_buf0;
637 }
638 }
639 }
640
641 return;
642 }
643
644 static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
645 {
646 outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */
647 outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */
648 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */
649 if (devpriv->dma0)
650 disable_dma(devpriv->dma0);
651 if (devpriv->dma1)
652 disable_dma(devpriv->dma1);
653 return 0;
654 }
655
656 /* the guts of the interrupt handler, that is shared with das1800_ai_poll */
657 static void das1800_ai_handler(struct comedi_device *dev)
658 {
659 struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */
660 struct comedi_async *async = s->async;
661 struct comedi_cmd *cmd = &async->cmd;
662 unsigned int status = inb(dev->iobase + DAS1800_STATUS);
663
664 async->events = 0;
665 /* select adc for base address + 0 */
666 outb(ADC, dev->iobase + DAS1800_SELECT);
667 /* dma buffer full */
668 if (devpriv->irq_dma_bits & DMA_ENABLED) {
669 /* look for data from dma transfer even if dma terminal count hasn't happened yet */
670 das1800_handle_dma(dev, s, status);
671 } else if (status & FHF) { /* if fifo half full */
672 das1800_handle_fifo_half_full(dev, s);
673 } else if (status & FNE) { /* if fifo not empty */
674 das1800_handle_fifo_not_empty(dev, s);
675 }
676
677 async->events |= COMEDI_CB_BLOCK;
678 /* if the card's fifo has overflowed */
679 if (status & OVF) {
680 /* clear OVF interrupt bit */
681 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
682 comedi_error(dev, "DAS1800 FIFO overflow");
683 das1800_cancel(dev, s);
684 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
685 comedi_event(dev, s);
686 return;
687 }
688 /* stop taking data if appropriate */
689 /* stop_src TRIG_EXT */
690 if (status & CT0TC) {
691 /* clear CT0TC interrupt bit */
692 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
693 /* make sure we get all remaining data from board before quitting */
694 if (devpriv->irq_dma_bits & DMA_ENABLED)
695 das1800_flush_dma(dev, s);
696 else
697 das1800_handle_fifo_not_empty(dev, s);
698 das1800_cancel(dev, s); /* disable hardware conversions */
699 async->events |= COMEDI_CB_EOA;
700 } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */
701 das1800_cancel(dev, s); /* disable hardware conversions */
702 async->events |= COMEDI_CB_EOA;
703 }
704
705 comedi_event(dev, s);
706
707 return;
708 }
709
710 static int das1800_ai_poll(struct comedi_device *dev,
711 struct comedi_subdevice *s)
712 {
713 unsigned long flags;
714
715 /* prevent race with interrupt handler */
716 spin_lock_irqsave(&dev->spinlock, flags);
717 das1800_ai_handler(dev);
718 spin_unlock_irqrestore(&dev->spinlock, flags);
719
720 return s->async->buf_write_count - s->async->buf_read_count;
721 }
722
723 static irqreturn_t das1800_interrupt(int irq, void *d)
724 {
725 struct comedi_device *dev = d;
726 unsigned int status;
727
728 if (dev->attached == 0) {
729 comedi_error(dev, "premature interrupt");
730 return IRQ_HANDLED;
731 }
732
733 /* Prevent race with das1800_ai_poll() on multi processor systems.
734 * Also protects indirect addressing in das1800_ai_handler */
735 spin_lock(&dev->spinlock);
736 status = inb(dev->iobase + DAS1800_STATUS);
737
738 /* if interrupt was not caused by das-1800 */
739 if (!(status & INT)) {
740 spin_unlock(&dev->spinlock);
741 return IRQ_NONE;
742 }
743 /* clear the interrupt status bit INT */
744 outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
745 /* handle interrupt */
746 das1800_ai_handler(dev);
747
748 spin_unlock(&dev->spinlock);
749 return IRQ_HANDLED;
750 }
751
752 /* converts requested conversion timing to timing compatible with
753 * hardware, used only when card is in 'burst mode'
754 */
755 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
756 {
757 unsigned int micro_sec;
758
759 /* in burst mode, the maximum conversion time is 64 microseconds */
760 if (convert_arg > 64000)
761 convert_arg = 64000;
762
763 /* the conversion time must be an integral number of microseconds */
764 switch (round_mode) {
765 case TRIG_ROUND_NEAREST:
766 default:
767 micro_sec = (convert_arg + 500) / 1000;
768 break;
769 case TRIG_ROUND_DOWN:
770 micro_sec = convert_arg / 1000;
771 break;
772 case TRIG_ROUND_UP:
773 micro_sec = (convert_arg - 1) / 1000 + 1;
774 break;
775 }
776
777 /* return number of nanoseconds */
778 return micro_sec * 1000;
779 }
780
781 /* test analog input cmd */
782 static int das1800_ai_do_cmdtest(struct comedi_device *dev,
783 struct comedi_subdevice *s,
784 struct comedi_cmd *cmd)
785 {
786 int err = 0;
787 int tmp;
788 unsigned int tmp_arg;
789 int i;
790 int unipolar;
791
792 /* step 1: make sure trigger sources are trivially valid */
793
794 tmp = cmd->start_src;
795 cmd->start_src &= TRIG_NOW | TRIG_EXT;
796 if (!cmd->start_src || tmp != cmd->start_src)
797 err++;
798
799 tmp = cmd->scan_begin_src;
800 cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT;
801 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
802 err++;
803
804 tmp = cmd->convert_src;
805 cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
806 if (!cmd->convert_src || tmp != cmd->convert_src)
807 err++;
808
809 tmp = cmd->scan_end_src;
810 cmd->scan_end_src &= TRIG_COUNT;
811 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
812 err++;
813
814 tmp = cmd->stop_src;
815 cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE;
816 if (!cmd->stop_src || tmp != cmd->stop_src)
817 err++;
818
819 if (err)
820 return 1;
821
822 /* step 2: make sure trigger sources are unique and mutually compatible */
823
824 /* uniqueness check */
825 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
826 err++;
827 if (cmd->scan_begin_src != TRIG_FOLLOW &&
828 cmd->scan_begin_src != TRIG_TIMER &&
829 cmd->scan_begin_src != TRIG_EXT)
830 err++;
831 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
832 err++;
833 if (cmd->stop_src != TRIG_COUNT &&
834 cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT)
835 err++;
836 /* compatibility check */
837 if (cmd->scan_begin_src != TRIG_FOLLOW &&
838 cmd->convert_src != TRIG_TIMER)
839 err++;
840
841 if (err)
842 return 2;
843
844 /* step 3: make sure arguments are trivially compatible */
845
846 if (cmd->start_arg != 0) {
847 cmd->start_arg = 0;
848 err++;
849 }
850 if (cmd->convert_src == TRIG_TIMER) {
851 if (cmd->convert_arg < thisboard->ai_speed) {
852 cmd->convert_arg = thisboard->ai_speed;
853 err++;
854 }
855 }
856 if (!cmd->chanlist_len) {
857 cmd->chanlist_len = 1;
858 err++;
859 }
860 if (cmd->scan_end_arg != cmd->chanlist_len) {
861 cmd->scan_end_arg = cmd->chanlist_len;
862 err++;
863 }
864
865 switch (cmd->stop_src) {
866 case TRIG_COUNT:
867 if (!cmd->stop_arg) {
868 cmd->stop_arg = 1;
869 err++;
870 }
871 break;
872 case TRIG_NONE:
873 if (cmd->stop_arg != 0) {
874 cmd->stop_arg = 0;
875 err++;
876 }
877 break;
878 default:
879 break;
880 }
881
882 if (err)
883 return 3;
884
885 /* step 4: fix up any arguments */
886
887 if (cmd->convert_src == TRIG_TIMER) {
888 /* if we are not in burst mode */
889 if (cmd->scan_begin_src == TRIG_FOLLOW) {
890 tmp_arg = cmd->convert_arg;
891 /* calculate counter values that give desired timing */
892 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
893 &(devpriv->divisor1),
894 &(devpriv->divisor2),
895 &(cmd->convert_arg),
896 cmd->
897 flags & TRIG_ROUND_MASK);
898 if (tmp_arg != cmd->convert_arg)
899 err++;
900 }
901 /* if we are in burst mode */
902 else {
903 /* check that convert_arg is compatible */
904 tmp_arg = cmd->convert_arg;
905 cmd->convert_arg =
906 burst_convert_arg(cmd->convert_arg,
907 cmd->flags & TRIG_ROUND_MASK);
908 if (tmp_arg != cmd->convert_arg)
909 err++;
910
911 if (cmd->scan_begin_src == TRIG_TIMER) {
912 /* if scans are timed faster than conversion rate allows */
913 if (cmd->convert_arg * cmd->chanlist_len >
914 cmd->scan_begin_arg) {
915 cmd->scan_begin_arg =
916 cmd->convert_arg *
917 cmd->chanlist_len;
918 err++;
919 }
920 tmp_arg = cmd->scan_begin_arg;
921 /* calculate counter values that give desired timing */
922 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
923 &(devpriv->
924 divisor1),
925 &(devpriv->
926 divisor2),
927 &(cmd->
928 scan_begin_arg),
929 cmd->
930 flags &
931 TRIG_ROUND_MASK);
932 if (tmp_arg != cmd->scan_begin_arg)
933 err++;
934 }
935 }
936 }
937
938 if (err)
939 return 4;
940
941 /* make sure user is not trying to mix unipolar and bipolar ranges */
942 if (cmd->chanlist) {
943 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
944 for (i = 1; i < cmd->chanlist_len; i++) {
945 if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
946 comedi_error(dev,
947 "unipolar and bipolar ranges cannot be mixed in the chanlist");
948 err++;
949 break;
950 }
951 }
952 }
953
954 if (err)
955 return 5;
956
957 return 0;
958 }
959
960 /* returns appropriate bits for control register a, depending on command */
961 static int control_a_bits(struct comedi_cmd cmd)
962 {
963 int control_a;
964
965 control_a = FFEN; /* enable fifo */
966 if (cmd.stop_src == TRIG_EXT)
967 control_a |= ATEN;
968 switch (cmd.start_src) {
969 case TRIG_EXT:
970 control_a |= TGEN | CGSL;
971 break;
972 case TRIG_NOW:
973 control_a |= CGEN;
974 break;
975 default:
976 break;
977 }
978
979 return control_a;
980 }
981
982 /* returns appropriate bits for control register c, depending on command */
983 static int control_c_bits(struct comedi_cmd cmd)
984 {
985 int control_c;
986 int aref;
987
988 /* set clock source to internal or external, select analog reference,
989 * select unipolar / bipolar
990 */
991 aref = CR_AREF(cmd.chanlist[0]);
992 control_c = UQEN; /* enable upper qram addresses */
993 if (aref != AREF_DIFF)
994 control_c |= SD;
995 if (aref == AREF_COMMON)
996 control_c |= CMEN;
997 /* if a unipolar range was selected */
998 if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR)
999 control_c |= UB;
1000 switch (cmd.scan_begin_src) {
1001 case TRIG_FOLLOW: /* not in burst mode */
1002 switch (cmd.convert_src) {
1003 case TRIG_TIMER:
1004 /* trig on cascaded counters */
1005 control_c |= IPCLK;
1006 break;
1007 case TRIG_EXT:
1008 /* trig on falling edge of external trigger */
1009 control_c |= XPCLK;
1010 break;
1011 default:
1012 break;
1013 }
1014 break;
1015 case TRIG_TIMER:
1016 /* burst mode with internal pacer clock */
1017 control_c |= BMDE | IPCLK;
1018 break;
1019 case TRIG_EXT:
1020 /* burst mode with external trigger */
1021 control_c |= BMDE | XPCLK;
1022 break;
1023 default:
1024 break;
1025 }
1026
1027 return control_c;
1028 }
1029
1030 /* loads counters with divisor1, divisor2 from private structure */
1031 static int das1800_set_frequency(struct comedi_device *dev)
1032 {
1033 int err = 0;
1034
1035 /* counter 1, mode 2 */
1036 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
1037 2))
1038 err++;
1039 /* counter 2, mode 2 */
1040 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
1041 2))
1042 err++;
1043 if (err)
1044 return -1;
1045
1046 return 0;
1047 }
1048
1049 /* sets up counters */
1050 static int setup_counters(struct comedi_device *dev, struct comedi_cmd cmd)
1051 {
1052 /* setup cascaded counters for conversion/scan frequency */
1053 switch (cmd.scan_begin_src) {
1054 case TRIG_FOLLOW: /* not in burst mode */
1055 if (cmd.convert_src == TRIG_TIMER) {
1056 /* set conversion frequency */
1057 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1058 &(devpriv->divisor1),
1059 &(devpriv->divisor2),
1060 &(cmd.convert_arg),
1061 cmd.
1062 flags & TRIG_ROUND_MASK);
1063 if (das1800_set_frequency(dev) < 0)
1064 return -1;
1065 }
1066 break;
1067 case TRIG_TIMER: /* in burst mode */
1068 /* set scan frequency */
1069 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1),
1070 &(devpriv->divisor2),
1071 &(cmd.scan_begin_arg),
1072 cmd.flags & TRIG_ROUND_MASK);
1073 if (das1800_set_frequency(dev) < 0)
1074 return -1;
1075 break;
1076 default:
1077 break;
1078 }
1079
1080 /* setup counter 0 for 'about triggering' */
1081 if (cmd.stop_src == TRIG_EXT) {
1082 /* load counter 0 in mode 0 */
1083 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1084 }
1085
1086 return 0;
1087 }
1088
1089 /* utility function that suggests a dma transfer size based on the conversion period 'ns' */
1090 static unsigned int suggest_transfer_size(struct comedi_cmd *cmd)
1091 {
1092 unsigned int size = DMA_BUF_SIZE;
1093 static const int sample_size = 2; /* size in bytes of one sample from board */
1094 unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */
1095 unsigned int max_size; /* maximum size we will allow for a transfer */
1096
1097 /* make dma buffer fill in 0.3 seconds for timed modes */
1098 switch (cmd->scan_begin_src) {
1099 case TRIG_FOLLOW: /* not in burst mode */
1100 if (cmd->convert_src == TRIG_TIMER)
1101 size = (fill_time / cmd->convert_arg) * sample_size;
1102 break;
1103 case TRIG_TIMER:
1104 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
1105 sample_size;
1106 break;
1107 default:
1108 size = DMA_BUF_SIZE;
1109 break;
1110 }
1111
1112 /* set a minimum and maximum size allowed */
1113 max_size = DMA_BUF_SIZE;
1114 /* if we are taking limited number of conversions, limit transfer size to that */
1115 if (cmd->stop_src == TRIG_COUNT &&
1116 cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
1117 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1118
1119 if (size > max_size)
1120 size = max_size;
1121 if (size < sample_size)
1122 size = sample_size;
1123
1124 return size;
1125 }
1126
1127 /* sets up dma */
1128 static void setup_dma(struct comedi_device *dev, struct comedi_cmd cmd)
1129 {
1130 unsigned long lock_flags;
1131 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1132
1133 if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1134 return;
1135
1136 /* determine a reasonable dma transfer size */
1137 devpriv->dma_transfer_size = suggest_transfer_size(&cmd);
1138 lock_flags = claim_dma_lock();
1139 disable_dma(devpriv->dma0);
1140 /* clear flip-flop to make sure 2-byte registers for
1141 * count and address get set correctly */
1142 clear_dma_ff(devpriv->dma0);
1143 set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
1144 /* set appropriate size of transfer */
1145 set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1146 devpriv->dma_current = devpriv->dma0;
1147 devpriv->dma_current_buf = devpriv->ai_buf0;
1148 enable_dma(devpriv->dma0);
1149 /* set up dual dma if appropriate */
1150 if (dual_dma) {
1151 disable_dma(devpriv->dma1);
1152 /* clear flip-flop to make sure 2-byte registers for
1153 * count and address get set correctly */
1154 clear_dma_ff(devpriv->dma1);
1155 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
1156 /* set appropriate size of transfer */
1157 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1158 enable_dma(devpriv->dma1);
1159 }
1160 release_dma_lock(lock_flags);
1161
1162 return;
1163 }
1164
1165 /* programs channel/gain list into card */
1166 static void program_chanlist(struct comedi_device *dev, struct comedi_cmd cmd)
1167 {
1168 int i, n, chan_range;
1169 unsigned long irq_flags;
1170 const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */
1171 const int range_bitshift = 8;
1172
1173 n = cmd.chanlist_len;
1174 /* spinlock protects indirect addressing */
1175 spin_lock_irqsave(&dev->spinlock, irq_flags);
1176 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1177 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */
1178 /* make channel / gain list */
1179 for (i = 0; i < n; i++) {
1180 chan_range =
1181 CR_CHAN(cmd.
1182 chanlist[i]) | ((CR_RANGE(cmd.chanlist[i]) &
1183 range_mask) << range_bitshift);
1184 outw(chan_range, dev->iobase + DAS1800_QRAM);
1185 }
1186 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1187 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1188
1189 return;
1190 }
1191
1192 /* analog input do_cmd */
1193 static int das1800_ai_do_cmd(struct comedi_device *dev,
1194 struct comedi_subdevice *s)
1195 {
1196 int ret;
1197 int control_a, control_c;
1198 struct comedi_async *async = s->async;
1199 struct comedi_cmd cmd = async->cmd;
1200
1201 if (!dev->irq) {
1202 comedi_error(dev,
1203 "no irq assigned for das-1800, cannot do hardware conversions");
1204 return -1;
1205 }
1206
1207 /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1208 * (because dma in handler is unsafe at hard real-time priority) */
1209 if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT))
1210 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1211 else
1212 devpriv->irq_dma_bits |= devpriv->dma_bits;
1213 /* interrupt on end of conversion for TRIG_WAKE_EOS */
1214 if (cmd.flags & TRIG_WAKE_EOS) {
1215 /* interrupt fifo not empty */
1216 devpriv->irq_dma_bits &= ~FIMD;
1217 } else {
1218 /* interrupt fifo half full */
1219 devpriv->irq_dma_bits |= FIMD;
1220 }
1221 /* determine how many conversions we need */
1222 if (cmd.stop_src == TRIG_COUNT)
1223 devpriv->count = cmd.stop_arg * cmd.chanlist_len;
1224
1225 das1800_cancel(dev, s);
1226
1227 /* determine proper bits for control registers */
1228 control_a = control_a_bits(cmd);
1229 control_c = control_c_bits(cmd);
1230
1231 /* setup card and start */
1232 program_chanlist(dev, cmd);
1233 ret = setup_counters(dev, cmd);
1234 if (ret < 0) {
1235 comedi_error(dev, "Error setting up counters");
1236 return ret;
1237 }
1238 setup_dma(dev, cmd);
1239 outb(control_c, dev->iobase + DAS1800_CONTROL_C);
1240 /* set conversion rate and length for burst mode */
1241 if (control_c & BMDE) {
1242 /* program conversion period with number of microseconds minus 1 */
1243 outb(cmd.convert_arg / 1000 - 1,
1244 dev->iobase + DAS1800_BURST_RATE);
1245 outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1246 }
1247 outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */
1248 outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */
1249 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1250
1251 return 0;
1252 }
1253
1254 /* read analog input */
1255 static int das1800_ai_rinsn(struct comedi_device *dev,
1256 struct comedi_subdevice *s,
1257 struct comedi_insn *insn, unsigned int *data)
1258 {
1259 int i, n;
1260 int chan, range, aref, chan_range;
1261 int timeout = 1000;
1262 short dpnt;
1263 int conv_flags = 0;
1264 unsigned long irq_flags;
1265
1266 /* set up analog reference and unipolar / bipolar mode */
1267 aref = CR_AREF(insn->chanspec);
1268 conv_flags |= UQEN;
1269 if (aref != AREF_DIFF)
1270 conv_flags |= SD;
1271 if (aref == AREF_COMMON)
1272 conv_flags |= CMEN;
1273 /* if a unipolar range was selected */
1274 if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1275 conv_flags |= UB;
1276
1277 outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */
1278 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1279 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */
1280 outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1281
1282 chan = CR_CHAN(insn->chanspec);
1283 /* mask of unipolar/bipolar bit from range */
1284 range = CR_RANGE(insn->chanspec) & 0x3;
1285 chan_range = chan | (range << 8);
1286 spin_lock_irqsave(&dev->spinlock, irq_flags);
1287 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1288 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */
1289 outw(chan_range, dev->iobase + DAS1800_QRAM);
1290 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1291 outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */
1292
1293 for (n = 0; n < insn->n; n++) {
1294 /* trigger conversion */
1295 outb(0, dev->iobase + DAS1800_FIFO);
1296 for (i = 0; i < timeout; i++) {
1297 if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1298 break;
1299 }
1300 if (i == timeout) {
1301 comedi_error(dev, "timeout");
1302 n = -ETIME;
1303 goto exit;
1304 }
1305 dpnt = inw(dev->iobase + DAS1800_FIFO);
1306 /* shift data to offset binary for bipolar ranges */
1307 if ((conv_flags & UB) == 0)
1308 dpnt += 1 << (thisboard->resolution - 1);
1309 data[n] = dpnt;
1310 }
1311 exit:
1312 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1313
1314 return n;
1315 }
1316
1317 /* writes to an analog output channel */
1318 static int das1800_ao_winsn(struct comedi_device *dev,
1319 struct comedi_subdevice *s,
1320 struct comedi_insn *insn, unsigned int *data)
1321 {
1322 int chan = CR_CHAN(insn->chanspec);
1323 /* int range = CR_RANGE(insn->chanspec); */
1324 int update_chan = thisboard->ao_n_chan - 1;
1325 short output;
1326 unsigned long irq_flags;
1327
1328 /* card expects two's complement data */
1329 output = data[0] - (1 << (thisboard->resolution - 1));
1330 /* if the write is to the 'update' channel, we need to remember its value */
1331 if (chan == update_chan)
1332 devpriv->ao_update_bits = output;
1333 /* write to channel */
1334 spin_lock_irqsave(&dev->spinlock, irq_flags);
1335 outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */
1336 outw(output, dev->iobase + DAS1800_DAC);
1337 /* now we need to write to 'update' channel to update all dac channels */
1338 if (chan != update_chan) {
1339 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */
1340 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1341 }
1342 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1343
1344 return 1;
1345 }
1346
1347 /* reads from digital input channels */
1348 static int das1800_di_rbits(struct comedi_device *dev,
1349 struct comedi_subdevice *s,
1350 struct comedi_insn *insn, unsigned int *data)
1351 {
1352
1353 data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1354 data[0] = 0;
1355
1356 return insn->n;
1357 }
1358
1359 /* writes to digital output channels */
1360 static int das1800_do_wbits(struct comedi_device *dev,
1361 struct comedi_subdevice *s,
1362 struct comedi_insn *insn, unsigned int *data)
1363 {
1364 unsigned int wbits;
1365
1366 /* only set bits that have been masked */
1367 data[0] &= (1 << s->n_chan) - 1;
1368 wbits = devpriv->do_bits;
1369 wbits &= ~data[0];
1370 wbits |= data[0] & data[1];
1371 devpriv->do_bits = wbits;
1372
1373 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1374
1375 data[1] = devpriv->do_bits;
1376
1377 return insn->n;
1378 }
1379
1380 static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
1381 unsigned int dma1)
1382 {
1383 unsigned long flags;
1384
1385 /* need an irq to do dma */
1386 if (dev->irq && dma0) {
1387 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
1388 switch ((dma0 & 0x7) | (dma1 << 4)) {
1389 case 0x5: /* dma0 == 5 */
1390 devpriv->dma_bits |= DMA_CH5;
1391 break;
1392 case 0x6: /* dma0 == 6 */
1393 devpriv->dma_bits |= DMA_CH6;
1394 break;
1395 case 0x7: /* dma0 == 7 */
1396 devpriv->dma_bits |= DMA_CH7;
1397 break;
1398 case 0x65: /* dma0 == 5, dma1 == 6 */
1399 devpriv->dma_bits |= DMA_CH5_CH6;
1400 break;
1401 case 0x76: /* dma0 == 6, dma1 == 7 */
1402 devpriv->dma_bits |= DMA_CH6_CH7;
1403 break;
1404 case 0x57: /* dma0 == 7, dma1 == 5 */
1405 devpriv->dma_bits |= DMA_CH7_CH5;
1406 break;
1407 default:
1408 dev_err(dev->class_dev,
1409 "only supports dma channels 5 through 7\n");
1410 dev_err(dev->class_dev,
1411 "Dual dma only allows the following combinations:\n");
1412 dev_err(dev->class_dev,
1413 "dma 5,6 / 6,7 / or 7,5\n");
1414 return -EINVAL;
1415 break;
1416 }
1417 if (request_dma(dma0, dev->driver->driver_name)) {
1418 dev_err(dev->class_dev,
1419 "failed to allocate dma channel %i\n", dma0);
1420 return -EINVAL;
1421 }
1422 devpriv->dma0 = dma0;
1423 devpriv->dma_current = dma0;
1424 if (dma1) {
1425 if (request_dma(dma1, dev->driver->driver_name)) {
1426 dev_err(dev->class_dev,
1427 "failed to allocate dma channel %i\n",
1428 dma1);
1429 return -EINVAL;
1430 }
1431 devpriv->dma1 = dma1;
1432 }
1433 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1434 if (devpriv->ai_buf0 == NULL)
1435 return -ENOMEM;
1436 devpriv->dma_current_buf = devpriv->ai_buf0;
1437 if (dma1) {
1438 devpriv->ai_buf1 =
1439 kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1440 if (devpriv->ai_buf1 == NULL)
1441 return -ENOMEM;
1442 }
1443 flags = claim_dma_lock();
1444 disable_dma(devpriv->dma0);
1445 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
1446 if (dma1) {
1447 disable_dma(devpriv->dma1);
1448 set_dma_mode(devpriv->dma1, DMA_MODE_READ);
1449 }
1450 release_dma_lock(flags);
1451 }
1452 return 0;
1453 }
1454
1455 static int das1800_probe(struct comedi_device *dev)
1456 {
1457 int id;
1458 int board;
1459
1460 id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */
1461 board = ((struct das1800_board *)dev->board_ptr) - das1800_boards;
1462
1463 switch (id) {
1464 case 0x3:
1465 if (board == das1801st_da || board == das1802st_da ||
1466 board == das1701st_da || board == das1702st_da) {
1467 dev_dbg(dev->class_dev, "Board model: %s\n",
1468 das1800_boards[board].name);
1469 return board;
1470 }
1471 printk
1472 (" Board model (probed, not recommended): das-1800st-da series\n");
1473 return das1801st;
1474 break;
1475 case 0x4:
1476 if (board == das1802hr_da || board == das1702hr_da) {
1477 dev_dbg(dev->class_dev, "Board model: %s\n",
1478 das1800_boards[board].name);
1479 return board;
1480 }
1481 printk
1482 (" Board model (probed, not recommended): das-1802hr-da\n");
1483 return das1802hr;
1484 break;
1485 case 0x5:
1486 if (board == das1801ao || board == das1802ao ||
1487 board == das1701ao || board == das1702ao) {
1488 dev_dbg(dev->class_dev, "Board model: %s\n",
1489 das1800_boards[board].name);
1490 return board;
1491 }
1492 printk
1493 (" Board model (probed, not recommended): das-1800ao series\n");
1494 return das1801ao;
1495 break;
1496 case 0x6:
1497 if (board == das1802hr || board == das1702hr) {
1498 dev_dbg(dev->class_dev, "Board model: %s\n",
1499 das1800_boards[board].name);
1500 return board;
1501 }
1502 printk
1503 (" Board model (probed, not recommended): das-1802hr\n");
1504 return das1802hr;
1505 break;
1506 case 0x7:
1507 if (board == das1801st || board == das1802st ||
1508 board == das1701st || board == das1702st) {
1509 dev_dbg(dev->class_dev, "Board model: %s\n",
1510 das1800_boards[board].name);
1511 return board;
1512 }
1513 printk
1514 (" Board model (probed, not recommended): das-1800st series\n");
1515 return das1801st;
1516 break;
1517 case 0x8:
1518 if (board == das1801hc || board == das1802hc) {
1519 dev_dbg(dev->class_dev, "Board model: %s\n",
1520 das1800_boards[board].name);
1521 return board;
1522 }
1523 printk
1524 (" Board model (probed, not recommended): das-1800hc series\n");
1525 return das1801hc;
1526 break;
1527 default:
1528 printk
1529 (" Board model: probe returned 0x%x (unknown, please report)\n",
1530 id);
1531 return board;
1532 break;
1533 }
1534 return -1;
1535 }
1536
1537 static int das1800_attach(struct comedi_device *dev,
1538 struct comedi_devconfig *it)
1539 {
1540 struct comedi_subdevice *s;
1541 unsigned long iobase = it->options[0];
1542 unsigned int irq = it->options[1];
1543 unsigned int dma0 = it->options[2];
1544 unsigned int dma1 = it->options[3];
1545 unsigned long iobase2;
1546 int board;
1547 int retval;
1548
1549 /* allocate and initialize dev->private */
1550 if (alloc_private(dev, sizeof(struct das1800_private)) < 0)
1551 return -ENOMEM;
1552
1553 printk(KERN_DEBUG "comedi%d: %s: io 0x%lx", dev->minor,
1554 dev->driver->driver_name, iobase);
1555 if (irq) {
1556 printk(KERN_CONT ", irq %u", irq);
1557 if (dma0) {
1558 printk(KERN_CONT ", dma %u", dma0);
1559 if (dma1)
1560 printk(KERN_CONT " and %u", dma1);
1561 }
1562 }
1563 printk(KERN_CONT "\n");
1564
1565 if (iobase == 0) {
1566 dev_err(dev->class_dev, "io base address required\n");
1567 return -EINVAL;
1568 }
1569
1570 /* check if io addresses are available */
1571 if (!request_region(iobase, DAS1800_SIZE, dev->driver->driver_name)) {
1572 printk
1573 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
1574 iobase, iobase + DAS1800_SIZE - 1);
1575 return -EIO;
1576 }
1577 dev->iobase = iobase;
1578
1579 board = das1800_probe(dev);
1580 if (board < 0) {
1581 dev_err(dev->class_dev, "unable to determine board type\n");
1582 return -ENODEV;
1583 }
1584
1585 dev->board_ptr = das1800_boards + board;
1586 dev->board_name = thisboard->name;
1587
1588 /* if it is an 'ao' board with fancy analog out then we need extra io ports */
1589 if (thisboard->ao_ability == 2) {
1590 iobase2 = iobase + IOBASE2;
1591 if (!request_region(iobase2, DAS1800_SIZE,
1592 dev->driver->driver_name)) {
1593 printk
1594 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
1595 iobase2, iobase2 + DAS1800_SIZE - 1);
1596 return -EIO;
1597 }
1598 devpriv->iobase2 = iobase2;
1599 }
1600
1601 /* grab our IRQ */
1602 if (irq) {
1603 if (request_irq(irq, das1800_interrupt, 0,
1604 dev->driver->driver_name, dev)) {
1605 dev_dbg(dev->class_dev, "unable to allocate irq %u\n",
1606 irq);
1607 return -EINVAL;
1608 }
1609 }
1610 dev->irq = irq;
1611
1612 /* set bits that tell card which irq to use */
1613 switch (irq) {
1614 case 0:
1615 break;
1616 case 3:
1617 devpriv->irq_dma_bits |= 0x8;
1618 break;
1619 case 5:
1620 devpriv->irq_dma_bits |= 0x10;
1621 break;
1622 case 7:
1623 devpriv->irq_dma_bits |= 0x18;
1624 break;
1625 case 10:
1626 devpriv->irq_dma_bits |= 0x28;
1627 break;
1628 case 11:
1629 devpriv->irq_dma_bits |= 0x30;
1630 break;
1631 case 15:
1632 devpriv->irq_dma_bits |= 0x38;
1633 break;
1634 default:
1635 dev_err(dev->class_dev, "irq out of range\n");
1636 return -EINVAL;
1637 break;
1638 }
1639
1640 retval = das1800_init_dma(dev, dma0, dma1);
1641 if (retval < 0)
1642 return retval;
1643
1644 if (devpriv->ai_buf0 == NULL) {
1645 devpriv->ai_buf0 =
1646 kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
1647 if (devpriv->ai_buf0 == NULL)
1648 return -ENOMEM;
1649 }
1650
1651 retval = comedi_alloc_subdevices(dev, 4);
1652 if (retval)
1653 return retval;
1654
1655 /* analog input subdevice */
1656 s = dev->subdevices + 0;
1657 dev->read_subdev = s;
1658 s->type = COMEDI_SUBD_AI;
1659 s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
1660 if (thisboard->common)
1661 s->subdev_flags |= SDF_COMMON;
1662 s->n_chan = thisboard->qram_len;
1663 s->len_chanlist = thisboard->qram_len;
1664 s->maxdata = (1 << thisboard->resolution) - 1;
1665 s->range_table = thisboard->range_ai;
1666 s->do_cmd = das1800_ai_do_cmd;
1667 s->do_cmdtest = das1800_ai_do_cmdtest;
1668 s->insn_read = das1800_ai_rinsn;
1669 s->poll = das1800_ai_poll;
1670 s->cancel = das1800_cancel;
1671
1672 /* analog out */
1673 s = dev->subdevices + 1;
1674 if (thisboard->ao_ability == 1) {
1675 s->type = COMEDI_SUBD_AO;
1676 s->subdev_flags = SDF_WRITABLE;
1677 s->n_chan = thisboard->ao_n_chan;
1678 s->maxdata = (1 << thisboard->resolution) - 1;
1679 s->range_table = &range_ao_1;
1680 s->insn_write = das1800_ao_winsn;
1681 } else {
1682 s->type = COMEDI_SUBD_UNUSED;
1683 }
1684
1685 /* di */
1686 s = dev->subdevices + 2;
1687 s->type = COMEDI_SUBD_DI;
1688 s->subdev_flags = SDF_READABLE;
1689 s->n_chan = 4;
1690 s->maxdata = 1;
1691 s->range_table = &range_digital;
1692 s->insn_bits = das1800_di_rbits;
1693
1694 /* do */
1695 s = dev->subdevices + 3;
1696 s->type = COMEDI_SUBD_DO;
1697 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
1698 s->n_chan = thisboard->do_n_chan;
1699 s->maxdata = 1;
1700 s->range_table = &range_digital;
1701 s->insn_bits = das1800_do_wbits;
1702
1703 das1800_cancel(dev, dev->read_subdev);
1704
1705 /* initialize digital out channels */
1706 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1707
1708 /* initialize analog out channels */
1709 if (thisboard->ao_ability == 1) {
1710 /* select 'update' dac channel for baseAddress + 0x0 */
1711 outb(DAC(thisboard->ao_n_chan - 1),
1712 dev->iobase + DAS1800_SELECT);
1713 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1714 }
1715
1716 return 0;
1717 };
1718
1719 static void das1800_detach(struct comedi_device *dev)
1720 {
1721 if (dev->iobase)
1722 release_region(dev->iobase, DAS1800_SIZE);
1723 if (dev->irq)
1724 free_irq(dev->irq, dev);
1725 if (dev->private) {
1726 if (devpriv->iobase2)
1727 release_region(devpriv->iobase2, DAS1800_SIZE);
1728 if (devpriv->dma0)
1729 free_dma(devpriv->dma0);
1730 if (devpriv->dma1)
1731 free_dma(devpriv->dma1);
1732 kfree(devpriv->ai_buf0);
1733 kfree(devpriv->ai_buf1);
1734 }
1735 };
1736
1737 static struct comedi_driver das1800_driver = {
1738 .driver_name = "das1800",
1739 .module = THIS_MODULE,
1740 .attach = das1800_attach,
1741 .detach = das1800_detach,
1742 .num_names = ARRAY_SIZE(das1800_boards),
1743 .board_name = &das1800_boards[0].name,
1744 .offset = sizeof(struct das1800_board),
1745 };
1746 module_comedi_driver(das1800_driver);
1747
1748 MODULE_AUTHOR("Comedi http://www.comedi.org");
1749 MODULE_DESCRIPTION("Comedi low-level driver");
1750 MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)