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Staging: comedi: remove RT code
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / staging / comedi / drivers / das1800.c
bloba3434088c9e64691f25405b5a0166f0d7126ad3b
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 "../comedidev.h"
105
106 #include <linux/ioport.h>
107 #include <asm/dma.h>
108
109 #include "8253.h"
110 #include "comedi_fc.h"
111
112 /* misc. defines */
113 #define DAS1800_SIZE 16 /* uses 16 io addresses */
114 #define FIFO_SIZE 1024 /* 1024 sample fifo */
115 #define TIMER_BASE 200 /* 5 Mhz master clock */
116 #define UNIPOLAR 0x4 /* bit that determines whether input range is uni/bipolar */
117 #define DMA_BUF_SIZE 0x1ff00 /* size in bytes of dma buffers */
118
119 /* Registers for the das1800 */
120 #define DAS1800_FIFO 0x0
121 #define DAS1800_QRAM 0x0
122 #define DAS1800_DAC 0x0
123 #define DAS1800_SELECT 0x2
124 #define ADC 0x0
125 #define QRAM 0x1
126 #define DAC(a) (0x2 + a)
127 #define DAS1800_DIGITAL 0x3
128 #define DAS1800_CONTROL_A 0x4
129 #define FFEN 0x1
130 #define CGEN 0x4
131 #define CGSL 0x8
132 #define TGEN 0x10
133 #define TGSL 0x20
134 #define ATEN 0x80
135 #define DAS1800_CONTROL_B 0x5
136 #define DMA_CH5 0x1
137 #define DMA_CH6 0x2
138 #define DMA_CH7 0x3
139 #define DMA_CH5_CH6 0x5
140 #define DMA_CH6_CH7 0x6
141 #define DMA_CH7_CH5 0x7
142 #define DMA_ENABLED 0x3 /* mask used to determine if dma is enabled */
143 #define DMA_DUAL 0x4
144 #define IRQ3 0x8
145 #define IRQ5 0x10
146 #define IRQ7 0x18
147 #define IRQ10 0x28
148 #define IRQ11 0x30
149 #define IRQ15 0x38
150 #define FIMD 0x40
151 #define DAS1800_CONTROL_C 0X6
152 #define IPCLK 0x1
153 #define XPCLK 0x3
154 #define BMDE 0x4
155 #define CMEN 0x8
156 #define UQEN 0x10
157 #define SD 0x40
158 #define UB 0x80
159 #define DAS1800_STATUS 0x7
160 /* bits that prevent interrupt status bits (and CVEN) from being cleared on write */
161 #define CLEAR_INTR_MASK (CVEN_MASK | 0x1f)
162 #define INT 0x1
163 #define DMATC 0x2
164 #define CT0TC 0x8
165 #define OVF 0x10
166 #define FHF 0x20
167 #define FNE 0x40
168 #define CVEN_MASK 0x40 /* masks CVEN on write */
169 #define CVEN 0x80
170 #define DAS1800_BURST_LENGTH 0x8
171 #define DAS1800_BURST_RATE 0x9
172 #define DAS1800_QRAM_ADDRESS 0xa
173 #define DAS1800_COUNTER 0xc
174
175 #define IOBASE2 0x400 /* offset of additional ioports used on 'ao' cards */
176
177 enum {
178 das1701st, das1701st_da, das1702st, das1702st_da, das1702hr,
179 das1702hr_da,
180 das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da,
181 das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao
182 };
183
184 static int das1800_attach(struct comedi_device *dev, struct comedi_devconfig *it);
185 static int das1800_detach(struct comedi_device *dev);
186 static int das1800_probe(struct comedi_device *dev);
187 static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
188 static irqreturn_t das1800_interrupt(int irq, void *d);
189 static int das1800_ai_poll(struct comedi_device *dev, struct comedi_subdevice *s);
190 static void das1800_ai_handler(struct comedi_device *dev);
191 static void das1800_handle_dma(struct comedi_device *dev, struct comedi_subdevice *s,
192 unsigned int status);
193 static void das1800_flush_dma(struct comedi_device *dev, struct comedi_subdevice *s);
194 static void das1800_flush_dma_channel(struct comedi_device *dev, struct comedi_subdevice *s,
195 unsigned int channel, uint16_t *buffer);
196 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
197 struct comedi_subdevice *s);
198 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
199 struct comedi_subdevice *s);
200 static int das1800_ai_do_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
201 struct comedi_cmd *cmd);
202 static int das1800_ai_do_cmd(struct comedi_device *dev, struct comedi_subdevice *s);
203 static int das1800_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
204 struct comedi_insn *insn, unsigned int *data);
205 static int das1800_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
206 struct comedi_insn *insn, unsigned int *data);
207 static int das1800_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
208 struct comedi_insn *insn, unsigned int *data);
209 static int das1800_do_wbits(struct comedi_device *dev, struct comedi_subdevice *s,
210 struct comedi_insn *insn, unsigned int *data);
211
212 static int das1800_set_frequency(struct comedi_device *dev);
213 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode);
214 static unsigned int suggest_transfer_size(struct comedi_cmd *cmd);
215
216 /* analog input ranges */
217 static const struct comedi_lrange range_ai_das1801 = {
218 8,
219 {
220 RANGE(-5, 5),
221 RANGE(-1, 1),
222 RANGE(-0.1, 0.1),
223 RANGE(-0.02, 0.02),
224 RANGE(0, 5),
225 RANGE(0, 1),
226 RANGE(0, 0.1),
227 RANGE(0, 0.02),
228 }
229 };
230
231 static const struct comedi_lrange range_ai_das1802 = {
232 8,
233 {
234 RANGE(-10, 10),
235 RANGE(-5, 5),
236 RANGE(-2.5, 2.5),
237 RANGE(-1.25, 1.25),
238 RANGE(0, 10),
239 RANGE(0, 5),
240 RANGE(0, 2.5),
241 RANGE(0, 1.25),
242 }
243 };
244
245 struct das1800_board {
246 const char *name;
247 int ai_speed; /* max conversion period in nanoseconds */
248 int resolution; /* bits of ai resolution */
249 int qram_len; /* length of card's channel / gain queue */
250 int common; /* supports AREF_COMMON flag */
251 int do_n_chan; /* number of digital output channels */
252 int ao_ability; /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */
253 int ao_n_chan; /* number of analog out channels */
254 const struct comedi_lrange *range_ai; /* available input ranges */
255 };
256
257 /* Warning: the maximum conversion speeds listed below are
258 * not always achievable depending on board setup (see
259 * user manual.)
260 */
261 static const struct das1800_board das1800_boards[] = {
262 {
263 .name = "das-1701st",
264 .ai_speed = 6250,
265 .resolution = 12,
266 .qram_len = 256,
267 .common = 1,
268 .do_n_chan = 4,
269 .ao_ability = 0,
270 .ao_n_chan = 0,
271 .range_ai = &range_ai_das1801,
272 },
273 {
274 .name = "das-1701st-da",
275 .ai_speed = 6250,
276 .resolution = 12,
277 .qram_len = 256,
278 .common = 1,
279 .do_n_chan = 4,
280 .ao_ability = 1,
281 .ao_n_chan = 4,
282 .range_ai = &range_ai_das1801,
283 },
284 {
285 .name = "das-1702st",
286 .ai_speed = 6250,
287 .resolution = 12,
288 .qram_len = 256,
289 .common = 1,
290 .do_n_chan = 4,
291 .ao_ability = 0,
292 .ao_n_chan = 0,
293 .range_ai = &range_ai_das1802,
294 },
295 {
296 .name = "das-1702st-da",
297 .ai_speed = 6250,
298 .resolution = 12,
299 .qram_len = 256,
300 .common = 1,
301 .do_n_chan = 4,
302 .ao_ability = 1,
303 .ao_n_chan = 4,
304 .range_ai = &range_ai_das1802,
305 },
306 {
307 .name = "das-1702hr",
308 .ai_speed = 20000,
309 .resolution = 16,
310 .qram_len = 256,
311 .common = 1,
312 .do_n_chan = 4,
313 .ao_ability = 0,
314 .ao_n_chan = 0,
315 .range_ai = &range_ai_das1802,
316 },
317 {
318 .name = "das-1702hr-da",
319 .ai_speed = 20000,
320 .resolution = 16,
321 .qram_len = 256,
322 .common = 1,
323 .do_n_chan = 4,
324 .ao_ability = 1,
325 .ao_n_chan = 2,
326 .range_ai = &range_ai_das1802,
327 },
328 {
329 .name = "das-1701ao",
330 .ai_speed = 6250,
331 .resolution = 12,
332 .qram_len = 256,
333 .common = 1,
334 .do_n_chan = 4,
335 .ao_ability = 2,
336 .ao_n_chan = 2,
337 .range_ai = &range_ai_das1801,
338 },
339 {
340 .name = "das-1702ao",
341 .ai_speed = 6250,
342 .resolution = 12,
343 .qram_len = 256,
344 .common = 1,
345 .do_n_chan = 4,
346 .ao_ability = 2,
347 .ao_n_chan = 2,
348 .range_ai = &range_ai_das1802,
349 },
350 {
351 .name = "das-1801st",
352 .ai_speed = 3000,
353 .resolution = 12,
354 .qram_len = 256,
355 .common = 1,
356 .do_n_chan = 4,
357 .ao_ability = 0,
358 .ao_n_chan = 0,
359 .range_ai = &range_ai_das1801,
360 },
361 {
362 .name = "das-1801st-da",
363 .ai_speed = 3000,
364 .resolution = 12,
365 .qram_len = 256,
366 .common = 1,
367 .do_n_chan = 4,
368 .ao_ability = 0,
369 .ao_n_chan = 4,
370 .range_ai = &range_ai_das1801,
371 },
372 {
373 .name = "das-1802st",
374 .ai_speed = 3000,
375 .resolution = 12,
376 .qram_len = 256,
377 .common = 1,
378 .do_n_chan = 4,
379 .ao_ability = 0,
380 .ao_n_chan = 0,
381 .range_ai = &range_ai_das1802,
382 },
383 {
384 .name = "das-1802st-da",
385 .ai_speed = 3000,
386 .resolution = 12,
387 .qram_len = 256,
388 .common = 1,
389 .do_n_chan = 4,
390 .ao_ability = 1,
391 .ao_n_chan = 4,
392 .range_ai = &range_ai_das1802,
393 },
394 {
395 .name = "das-1802hr",
396 .ai_speed = 10000,
397 .resolution = 16,
398 .qram_len = 256,
399 .common = 1,
400 .do_n_chan = 4,
401 .ao_ability = 0,
402 .ao_n_chan = 0,
403 .range_ai = &range_ai_das1802,
404 },
405 {
406 .name = "das-1802hr-da",
407 .ai_speed = 10000,
408 .resolution = 16,
409 .qram_len = 256,
410 .common = 1,
411 .do_n_chan = 4,
412 .ao_ability = 1,
413 .ao_n_chan = 2,
414 .range_ai = &range_ai_das1802,
415 },
416 {
417 .name = "das-1801hc",
418 .ai_speed = 3000,
419 .resolution = 12,
420 .qram_len = 64,
421 .common = 0,
422 .do_n_chan = 8,
423 .ao_ability = 1,
424 .ao_n_chan = 2,
425 .range_ai = &range_ai_das1801,
426 },
427 {
428 .name = "das-1802hc",
429 .ai_speed = 3000,
430 .resolution = 12,
431 .qram_len = 64,
432 .common = 0,
433 .do_n_chan = 8,
434 .ao_ability = 1,
435 .ao_n_chan = 2,
436 .range_ai = &range_ai_das1802,
437 },
438 {
439 .name = "das-1801ao",
440 .ai_speed = 3000,
441 .resolution = 12,
442 .qram_len = 256,
443 .common = 1,
444 .do_n_chan = 4,
445 .ao_ability = 2,
446 .ao_n_chan = 2,
447 .range_ai = &range_ai_das1801,
448 },
449 {
450 .name = "das-1802ao",
451 .ai_speed = 3000,
452 .resolution = 12,
453 .qram_len = 256,
454 .common = 1,
455 .do_n_chan = 4,
456 .ao_ability = 2,
457 .ao_n_chan = 2,
458 .range_ai = &range_ai_das1802,
459 },
460 };
461
462 /*
463 * Useful for shorthand access to the particular board structure
464 */
465 #define thisboard ((const struct das1800_board *)dev->board_ptr)
466
467 struct das1800_private {
468 volatile unsigned int count; /* number of data points left to be taken */
469 unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */
470 unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */
471 int do_bits; /* digital output bits */
472 int irq_dma_bits; /* bits for control register b */
473 /* dma bits for control register b, stored so that dma can be
474 * turned on and off */
475 int dma_bits;
476 unsigned int dma0; /* dma channels used */
477 unsigned int dma1;
478 volatile unsigned int dma_current; /* dma channel currently in use */
479 uint16_t *ai_buf0; /* pointers to dma buffers */
480 uint16_t *ai_buf1;
481 uint16_t *dma_current_buf; /* pointer to dma buffer currently being used */
482 unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
483 unsigned long iobase2; /* secondary io address used for analog out on 'ao' boards */
484 short ao_update_bits; /* remembers the last write to the 'update' dac */
485 };
486
487 #define devpriv ((struct das1800_private *)dev->private)
488
489 /* analog out range for boards with basic analog out */
490 static const struct comedi_lrange range_ao_1 = {
491 1,
492 {
493 RANGE(-10, 10),
494 }
495 };
496
497 /* analog out range for 'ao' boards */
498 /*
499 static const struct comedi_lrange range_ao_2 = {
500 2,
501 {
502 RANGE(-10, 10),
503 RANGE(-5, 5),
504 }
505 };
506 */
507
508 static struct comedi_driver driver_das1800 = {
509 .driver_name = "das1800",
510 .module = THIS_MODULE,
511 .attach = das1800_attach,
512 .detach = das1800_detach,
513 .num_names = ARRAY_SIZE(das1800_boards),
514 .board_name = &das1800_boards[0].name,
515 .offset = sizeof(struct das1800_board),
516 };
517
518 /*
519 * A convenient macro that defines init_module() and cleanup_module(),
520 * as necessary.
521 */
522 COMEDI_INITCLEANUP(driver_das1800);
523
524 static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
525 unsigned int dma1)
526 {
527 unsigned long flags;
528
529 /* need an irq to do dma */
530 if (dev->irq && dma0) {
531 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
532 switch ((dma0 & 0x7) | (dma1 << 4)) {
533 case 0x5: /* dma0 == 5 */
534 devpriv->dma_bits |= DMA_CH5;
535 break;
536 case 0x6: /* dma0 == 6 */
537 devpriv->dma_bits |= DMA_CH6;
538 break;
539 case 0x7: /* dma0 == 7 */
540 devpriv->dma_bits |= DMA_CH7;
541 break;
542 case 0x65: /* dma0 == 5, dma1 == 6 */
543 devpriv->dma_bits |= DMA_CH5_CH6;
544 break;
545 case 0x76: /* dma0 == 6, dma1 == 7 */
546 devpriv->dma_bits |= DMA_CH6_CH7;
547 break;
548 case 0x57: /* dma0 == 7, dma1 == 5 */
549 devpriv->dma_bits |= DMA_CH7_CH5;
550 break;
551 default:
552 printk(" only supports dma channels 5 through 7\n"
553 " Dual dma only allows the following combinations:\n"
554 " dma 5,6 / 6,7 / or 7,5\n");
555 return -EINVAL;
556 break;
557 }
558 if (request_dma(dma0, driver_das1800.driver_name)) {
559 printk(" failed to allocate dma channel %i\n", dma0);
560 return -EINVAL;
561 }
562 devpriv->dma0 = dma0;
563 devpriv->dma_current = dma0;
564 if (dma1) {
565 if (request_dma(dma1, driver_das1800.driver_name)) {
566 printk(" failed to allocate dma channel %i\n",
567 dma1);
568 return -EINVAL;
569 }
570 devpriv->dma1 = dma1;
571 }
572 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
573 if (devpriv->ai_buf0 == NULL)
574 return -ENOMEM;
575 devpriv->dma_current_buf = devpriv->ai_buf0;
576 if (dma1) {
577 devpriv->ai_buf1 =
578 kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
579 if (devpriv->ai_buf1 == NULL)
580 return -ENOMEM;
581 }
582 flags = claim_dma_lock();
583 disable_dma(devpriv->dma0);
584 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
585 if (dma1) {
586 disable_dma(devpriv->dma1);
587 set_dma_mode(devpriv->dma1, DMA_MODE_READ);
588 }
589 release_dma_lock(flags);
590 }
591 return 0;
592 }
593
594 static int das1800_attach(struct comedi_device *dev, struct comedi_devconfig *it)
595 {
596 struct comedi_subdevice *s;
597 unsigned long iobase = it->options[0];
598 unsigned int irq = it->options[1];
599 unsigned int dma0 = it->options[2];
600 unsigned int dma1 = it->options[3];
601 unsigned long iobase2;
602 int board;
603 int retval;
604
605 /* allocate and initialize dev->private */
606 if (alloc_private(dev, sizeof(struct das1800_private)) < 0)
607 return -ENOMEM;
608
609 printk("comedi%d: %s: io 0x%lx", dev->minor, driver_das1800.driver_name,
610 iobase);
611 if (irq) {
612 printk(", irq %u", irq);
613 if (dma0) {
614 printk(", dma %u", dma0);
615 if (dma1)
616 printk(" and %u", dma1);
617 }
618 }
619 printk("\n");
620
621 if (iobase == 0) {
622 printk(" io base address required\n");
623 return -EINVAL;
624 }
625
626 /* check if io addresses are available */
627 if (!request_region(iobase, DAS1800_SIZE, driver_das1800.driver_name)) {
628 printk(" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", iobase, iobase + DAS1800_SIZE - 1);
629 return -EIO;
630 }
631 dev->iobase = iobase;
632
633 board = das1800_probe(dev);
634 if (board < 0) {
635 printk(" unable to determine board type\n");
636 return -ENODEV;
637 }
638
639 dev->board_ptr = das1800_boards + board;
640 dev->board_name = thisboard->name;
641
642 /* if it is an 'ao' board with fancy analog out then we need extra io ports */
643 if (thisboard->ao_ability == 2) {
644 iobase2 = iobase + IOBASE2;
645 if (!request_region(iobase2, DAS1800_SIZE,
646 driver_das1800.driver_name)) {
647 printk(" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", iobase2, iobase2 + DAS1800_SIZE - 1);
648 return -EIO;
649 }
650 devpriv->iobase2 = iobase2;
651 }
652
653 /* grab our IRQ */
654 if (irq) {
655 if (request_irq(irq, das1800_interrupt, 0,
656 driver_das1800.driver_name, dev)) {
657 printk(" unable to allocate irq %u\n", irq);
658 return -EINVAL;
659 }
660 }
661 dev->irq = irq;
662
663 /* set bits that tell card which irq to use */
664 switch (irq) {
665 case 0:
666 break;
667 case 3:
668 devpriv->irq_dma_bits |= 0x8;
669 break;
670 case 5:
671 devpriv->irq_dma_bits |= 0x10;
672 break;
673 case 7:
674 devpriv->irq_dma_bits |= 0x18;
675 break;
676 case 10:
677 devpriv->irq_dma_bits |= 0x28;
678 break;
679 case 11:
680 devpriv->irq_dma_bits |= 0x30;
681 break;
682 case 15:
683 devpriv->irq_dma_bits |= 0x38;
684 break;
685 default:
686 printk(" irq out of range\n");
687 return -EINVAL;
688 break;
689 }
690
691 retval = das1800_init_dma(dev, dma0, dma1);
692 if (retval < 0)
693 return retval;
694
695 if (devpriv->ai_buf0 == NULL) {
696 devpriv->ai_buf0 =
697 kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
698 if (devpriv->ai_buf0 == NULL)
699 return -ENOMEM;
700 }
701
702 if (alloc_subdevices(dev, 4) < 0)
703 return -ENOMEM;
704
705 /* analog input subdevice */
706 s = dev->subdevices + 0;
707 dev->read_subdev = s;
708 s->type = COMEDI_SUBD_AI;
709 s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
710 if (thisboard->common)
711 s->subdev_flags |= SDF_COMMON;
712 s->n_chan = thisboard->qram_len;
713 s->len_chanlist = thisboard->qram_len;
714 s->maxdata = (1 << thisboard->resolution) - 1;
715 s->range_table = thisboard->range_ai;
716 s->do_cmd = das1800_ai_do_cmd;
717 s->do_cmdtest = das1800_ai_do_cmdtest;
718 s->insn_read = das1800_ai_rinsn;
719 s->poll = das1800_ai_poll;
720 s->cancel = das1800_cancel;
721
722 /* analog out */
723 s = dev->subdevices + 1;
724 if (thisboard->ao_ability == 1) {
725 s->type = COMEDI_SUBD_AO;
726 s->subdev_flags = SDF_WRITABLE;
727 s->n_chan = thisboard->ao_n_chan;
728 s->maxdata = (1 << thisboard->resolution) - 1;
729 s->range_table = &range_ao_1;
730 s->insn_write = das1800_ao_winsn;
731 } else {
732 s->type = COMEDI_SUBD_UNUSED;
733 }
734
735 /* di */
736 s = dev->subdevices + 2;
737 s->type = COMEDI_SUBD_DI;
738 s->subdev_flags = SDF_READABLE;
739 s->n_chan = 4;
740 s->maxdata = 1;
741 s->range_table = &range_digital;
742 s->insn_bits = das1800_di_rbits;
743
744 /* do */
745 s = dev->subdevices + 3;
746 s->type = COMEDI_SUBD_DO;
747 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
748 s->n_chan = thisboard->do_n_chan;
749 s->maxdata = 1;
750 s->range_table = &range_digital;
751 s->insn_bits = das1800_do_wbits;
752
753 das1800_cancel(dev, dev->read_subdev);
754
755 /* initialize digital out channels */
756 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
757
758 /* initialize analog out channels */
759 if (thisboard->ao_ability == 1) {
760 /* select 'update' dac channel for baseAddress + 0x0 */
761 outb(DAC(thisboard->ao_n_chan - 1),
762 dev->iobase + DAS1800_SELECT);
763 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
764 }
765
766 return 0;
767 };
768
769 static int das1800_detach(struct comedi_device *dev)
770 {
771 /* only free stuff if it has been allocated by _attach */
772 if (dev->iobase)
773 release_region(dev->iobase, DAS1800_SIZE);
774 if (dev->irq)
775 free_irq(dev->irq, dev);
776 if (dev->private) {
777 if (devpriv->iobase2)
778 release_region(devpriv->iobase2, DAS1800_SIZE);
779 if (devpriv->dma0)
780 free_dma(devpriv->dma0);
781 if (devpriv->dma1)
782 free_dma(devpriv->dma1);
783 if (devpriv->ai_buf0)
784 kfree(devpriv->ai_buf0);
785 if (devpriv->ai_buf1)
786 kfree(devpriv->ai_buf1);
787 }
788
789 printk("comedi%d: %s: remove\n", dev->minor,
790 driver_das1800.driver_name);
791
792 return 0;
793 };
794
795 /* probes and checks das-1800 series board type
796 */
797 static int das1800_probe(struct comedi_device *dev)
798 {
799 int id;
800 int board;
801
802 id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */
803 board = ((struct das1800_board *) dev->board_ptr) - das1800_boards;
804
805 switch (id) {
806 case 0x3:
807 if (board == das1801st_da || board == das1802st_da ||
808 board == das1701st_da || board == das1702st_da) {
809 printk(" Board model: %s\n",
810 das1800_boards[board].name);
811 return board;
812 }
813 printk(" Board model (probed, not recommended): das-1800st-da series\n");
814 return das1801st;
815 break;
816 case 0x4:
817 if (board == das1802hr_da || board == das1702hr_da) {
818 printk(" Board model: %s\n",
819 das1800_boards[board].name);
820 return board;
821 }
822 printk(" Board model (probed, not recommended): das-1802hr-da\n");
823 return das1802hr;
824 break;
825 case 0x5:
826 if (board == das1801ao || board == das1802ao ||
827 board == das1701ao || board == das1702ao) {
828 printk(" Board model: %s\n",
829 das1800_boards[board].name);
830 return board;
831 }
832 printk(" Board model (probed, not recommended): das-1800ao series\n");
833 return das1801ao;
834 break;
835 case 0x6:
836 if (board == das1802hr || board == das1702hr) {
837 printk(" Board model: %s\n",
838 das1800_boards[board].name);
839 return board;
840 }
841 printk(" Board model (probed, not recommended): das-1802hr\n");
842 return das1802hr;
843 break;
844 case 0x7:
845 if (board == das1801st || board == das1802st ||
846 board == das1701st || board == das1702st) {
847 printk(" Board model: %s\n",
848 das1800_boards[board].name);
849 return board;
850 }
851 printk(" Board model (probed, not recommended): das-1800st series\n");
852 return das1801st;
853 break;
854 case 0x8:
855 if (board == das1801hc || board == das1802hc) {
856 printk(" Board model: %s\n",
857 das1800_boards[board].name);
858 return board;
859 }
860 printk(" Board model (probed, not recommended): das-1800hc series\n");
861 return das1801hc;
862 break;
863 default:
864 printk(" Board model: probe returned 0x%x (unknown, please report)\n", id);
865 return board;
866 break;
867 }
868 return -1;
869 }
870
871 static int das1800_ai_poll(struct comedi_device *dev, struct comedi_subdevice *s)
872 {
873 unsigned long flags;
874
875 /* prevent race with interrupt handler */
876 spin_lock_irqsave(&dev->spinlock, flags);
877 das1800_ai_handler(dev);
878 spin_unlock_irqrestore(&dev->spinlock, flags);
879
880 return s->async->buf_write_count - s->async->buf_read_count;
881 }
882
883 static irqreturn_t das1800_interrupt(int irq, void *d)
884 {
885 struct comedi_device *dev = d;
886 unsigned int status;
887
888 if (dev->attached == 0) {
889 comedi_error(dev, "premature interrupt");
890 return IRQ_HANDLED;
891 }
892
893 /* Prevent race with das1800_ai_poll() on multi processor systems.
894 * Also protects indirect addressing in das1800_ai_handler */
895 spin_lock(&dev->spinlock);
896 status = inb(dev->iobase + DAS1800_STATUS);
897
898 /* if interrupt was not caused by das-1800 */
899 if (!(status & INT)) {
900 spin_unlock(&dev->spinlock);
901 return IRQ_NONE;
902 }
903 /* clear the interrupt status bit INT */
904 outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
905 /* handle interrupt */
906 das1800_ai_handler(dev);
907
908 spin_unlock(&dev->spinlock);
909 return IRQ_HANDLED;
910 }
911
912 /* the guts of the interrupt handler, that is shared with das1800_ai_poll */
913 static void das1800_ai_handler(struct comedi_device *dev)
914 {
915 struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */
916 struct comedi_async *async = s->async;
917 struct comedi_cmd *cmd = &async->cmd;
918 unsigned int status = inb(dev->iobase + DAS1800_STATUS);
919
920 async->events = 0;
921 /* select adc for base address + 0 */
922 outb(ADC, dev->iobase + DAS1800_SELECT);
923 /* dma buffer full */
924 if (devpriv->irq_dma_bits & DMA_ENABLED) {
925 /* look for data from dma transfer even if dma terminal count hasn't happened yet */
926 das1800_handle_dma(dev, s, status);
927 } else if (status & FHF) { /* if fifo half full */
928 das1800_handle_fifo_half_full(dev, s);
929 } else if (status & FNE) { /* if fifo not empty */
930 das1800_handle_fifo_not_empty(dev, s);
931 }
932
933 async->events |= COMEDI_CB_BLOCK;
934 /* if the card's fifo has overflowed */
935 if (status & OVF) {
936 /* clear OVF interrupt bit */
937 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
938 comedi_error(dev, "DAS1800 FIFO overflow");
939 das1800_cancel(dev, s);
940 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
941 comedi_event(dev, s);
942 return;
943 }
944 /* stop taking data if appropriate */
945 /* stop_src TRIG_EXT */
946 if (status & CT0TC) {
947 /* clear CT0TC interrupt bit */
948 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
949 /* make sure we get all remaining data from board before quitting */
950 if (devpriv->irq_dma_bits & DMA_ENABLED)
951 das1800_flush_dma(dev, s);
952 else
953 das1800_handle_fifo_not_empty(dev, s);
954 das1800_cancel(dev, s); /* disable hardware conversions */
955 async->events |= COMEDI_CB_EOA;
956 } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */
957 das1800_cancel(dev, s); /* disable hardware conversions */
958 async->events |= COMEDI_CB_EOA;
959 }
960
961 comedi_event(dev, s);
962
963 return;
964 }
965
966 static void das1800_handle_dma(struct comedi_device *dev, struct comedi_subdevice *s,
967 unsigned int status)
968 {
969 unsigned long flags;
970 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
971
972 flags = claim_dma_lock();
973 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
974 devpriv->dma_current_buf);
975 /* re-enable dma channel */
976 set_dma_addr(devpriv->dma_current,
977 virt_to_bus(devpriv->dma_current_buf));
978 set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
979 enable_dma(devpriv->dma_current);
980 release_dma_lock(flags);
981
982 if (status & DMATC) {
983 /* clear DMATC interrupt bit */
984 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
985 /* switch dma channels for next time, if appropriate */
986 if (dual_dma) {
987 /* read data from the other channel next time */
988 if (devpriv->dma_current == devpriv->dma0) {
989 devpriv->dma_current = devpriv->dma1;
990 devpriv->dma_current_buf = devpriv->ai_buf1;
991 } else {
992 devpriv->dma_current = devpriv->dma0;
993 devpriv->dma_current_buf = devpriv->ai_buf0;
994 }
995 }
996 }
997
998 return;
999 }
1000
1001 static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
1002 uint16_t sample)
1003 {
1004 sample += 1 << (thisboard->resolution - 1);
1005 return sample;
1006 }
1007
1008 static void munge_data(struct comedi_device *dev, uint16_t *array,
1009 unsigned int num_elements)
1010 {
1011 unsigned int i;
1012 int unipolar;
1013
1014 /* see if card is using a unipolar or bipolar range so we can munge data correctly */
1015 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1016
1017 /* convert to unsigned type if we are in a bipolar mode */
1018 if (!unipolar) {
1019 for (i = 0; i < num_elements; i++) {
1020 array[i] = munge_bipolar_sample(dev, array[i]);
1021 }
1022 }
1023 }
1024
1025 /* Utility function used by das1800_flush_dma() and das1800_handle_dma().
1026 * Assumes dma lock is held */
1027 static void das1800_flush_dma_channel(struct comedi_device *dev, struct comedi_subdevice *s,
1028 unsigned int channel, uint16_t *buffer)
1029 {
1030 unsigned int num_bytes, num_samples;
1031 struct comedi_cmd *cmd = &s->async->cmd;
1032
1033 disable_dma(channel);
1034
1035 /* clear flip-flop to make sure 2-byte registers
1036 * get set correctly */
1037 clear_dma_ff(channel);
1038
1039 /* figure out how many points to read */
1040 num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
1041 num_samples = num_bytes / sizeof(short);
1042
1043 /* if we only need some of the points */
1044 if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
1045 num_samples = devpriv->count;
1046
1047 munge_data(dev, buffer, num_samples);
1048 cfc_write_array_to_buffer(s, buffer, num_bytes);
1049 if (s->async->cmd.stop_src == TRIG_COUNT)
1050 devpriv->count -= num_samples;
1051
1052 return;
1053 }
1054
1055 /* flushes remaining data from board when external trigger has stopped aquisition
1056 * and we are using dma transfers */
1057 static void das1800_flush_dma(struct comedi_device *dev, struct comedi_subdevice *s)
1058 {
1059 unsigned long flags;
1060 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1061
1062 flags = claim_dma_lock();
1063 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1064 devpriv->dma_current_buf);
1065
1066 if (dual_dma) {
1067 /* switch to other channel and flush it */
1068 if (devpriv->dma_current == devpriv->dma0) {
1069 devpriv->dma_current = devpriv->dma1;
1070 devpriv->dma_current_buf = devpriv->ai_buf1;
1071 } else {
1072 devpriv->dma_current = devpriv->dma0;
1073 devpriv->dma_current_buf = devpriv->ai_buf0;
1074 }
1075 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1076 devpriv->dma_current_buf);
1077 }
1078
1079 release_dma_lock(flags);
1080
1081 /* get any remaining samples in fifo */
1082 das1800_handle_fifo_not_empty(dev, s);
1083
1084 return;
1085 }
1086
1087 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
1088 struct comedi_subdevice *s)
1089 {
1090 int numPoints = 0; /* number of points to read */
1091 struct comedi_cmd *cmd = &s->async->cmd;
1092
1093 numPoints = FIFO_SIZE / 2;
1094 /* if we only need some of the points */
1095 if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
1096 numPoints = devpriv->count;
1097 insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
1098 munge_data(dev, devpriv->ai_buf0, numPoints);
1099 cfc_write_array_to_buffer(s, devpriv->ai_buf0,
1100 numPoints * sizeof(devpriv->ai_buf0[0]));
1101 if (cmd->stop_src == TRIG_COUNT)
1102 devpriv->count -= numPoints;
1103 return;
1104 }
1105
1106 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
1107 struct comedi_subdevice *s)
1108 {
1109 short dpnt;
1110 int unipolar;
1111 struct comedi_cmd *cmd = &s->async->cmd;
1112
1113 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1114
1115 while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
1116 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
1117 break;
1118 dpnt = inw(dev->iobase + DAS1800_FIFO);
1119 /* convert to unsigned type if we are in a bipolar mode */
1120 if (!unipolar) ;
1121 dpnt = munge_bipolar_sample(dev, dpnt);
1122 cfc_write_to_buffer(s, dpnt);
1123 if (cmd->stop_src == TRIG_COUNT)
1124 devpriv->count--;
1125 }
1126
1127 return;
1128 }
1129
1130 static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1131 {
1132 outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */
1133 outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */
1134 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */
1135 if (devpriv->dma0)
1136 disable_dma(devpriv->dma0);
1137 if (devpriv->dma1)
1138 disable_dma(devpriv->dma1);
1139 return 0;
1140 }
1141
1142 /* test analog input cmd */
1143 static int das1800_ai_do_cmdtest(struct comedi_device *dev, struct comedi_subdevice *s,
1144 struct comedi_cmd *cmd)
1145 {
1146 int err = 0;
1147 int tmp;
1148 unsigned int tmp_arg;
1149 int i;
1150 int unipolar;
1151
1152 /* step 1: make sure trigger sources are trivially valid */
1153
1154 tmp = cmd->start_src;
1155 cmd->start_src &= TRIG_NOW | TRIG_EXT;
1156 if (!cmd->start_src || tmp != cmd->start_src)
1157 err++;
1158
1159 tmp = cmd->scan_begin_src;
1160 cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT;
1161 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
1162 err++;
1163
1164 tmp = cmd->convert_src;
1165 cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
1166 if (!cmd->convert_src || tmp != cmd->convert_src)
1167 err++;
1168
1169 tmp = cmd->scan_end_src;
1170 cmd->scan_end_src &= TRIG_COUNT;
1171 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
1172 err++;
1173
1174 tmp = cmd->stop_src;
1175 cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE;
1176 if (!cmd->stop_src || tmp != cmd->stop_src)
1177 err++;
1178
1179 if (err)
1180 return 1;
1181
1182 /* step 2: make sure trigger sources are unique and mutually compatible */
1183
1184 /* uniqueness check */
1185 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
1186 err++;
1187 if (cmd->scan_begin_src != TRIG_FOLLOW &&
1188 cmd->scan_begin_src != TRIG_TIMER &&
1189 cmd->scan_begin_src != TRIG_EXT)
1190 err++;
1191 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
1192 err++;
1193 if (cmd->stop_src != TRIG_COUNT &&
1194 cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT)
1195 err++;
1196 /* compatibility check */
1197 if (cmd->scan_begin_src != TRIG_FOLLOW &&
1198 cmd->convert_src != TRIG_TIMER)
1199 err++;
1200
1201 if (err)
1202 return 2;
1203
1204 /* step 3: make sure arguments are trivially compatible */
1205
1206 if (cmd->start_arg != 0) {
1207 cmd->start_arg = 0;
1208 err++;
1209 }
1210 if (cmd->convert_src == TRIG_TIMER) {
1211 if (cmd->convert_arg < thisboard->ai_speed) {
1212 cmd->convert_arg = thisboard->ai_speed;
1213 err++;
1214 }
1215 }
1216 if (!cmd->chanlist_len) {
1217 cmd->chanlist_len = 1;
1218 err++;
1219 }
1220 if (cmd->scan_end_arg != cmd->chanlist_len) {
1221 cmd->scan_end_arg = cmd->chanlist_len;
1222 err++;
1223 }
1224
1225 switch (cmd->stop_src) {
1226 case TRIG_COUNT:
1227 if (!cmd->stop_arg) {
1228 cmd->stop_arg = 1;
1229 err++;
1230 }
1231 break;
1232 case TRIG_NONE:
1233 if (cmd->stop_arg != 0) {
1234 cmd->stop_arg = 0;
1235 err++;
1236 }
1237 break;
1238 default:
1239 break;
1240 }
1241
1242 if (err)
1243 return 3;
1244
1245 /* step 4: fix up any arguments */
1246
1247 if (cmd->convert_src == TRIG_TIMER) {
1248 /* if we are not in burst mode */
1249 if (cmd->scan_begin_src == TRIG_FOLLOW) {
1250 tmp_arg = cmd->convert_arg;
1251 /* calculate counter values that give desired timing */
1252 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1253 &(devpriv->divisor1), &(devpriv->divisor2),
1254 &(cmd->convert_arg),
1255 cmd->flags & TRIG_ROUND_MASK);
1256 if (tmp_arg != cmd->convert_arg)
1257 err++;
1258 }
1259 /* if we are in burst mode */
1260 else {
1261 /* check that convert_arg is compatible */
1262 tmp_arg = cmd->convert_arg;
1263 cmd->convert_arg =
1264 burst_convert_arg(cmd->convert_arg,
1265 cmd->flags & TRIG_ROUND_MASK);
1266 if (tmp_arg != cmd->convert_arg)
1267 err++;
1268
1269 if (cmd->scan_begin_src == TRIG_TIMER) {
1270 /* if scans are timed faster than conversion rate allows */
1271 if (cmd->convert_arg * cmd->chanlist_len >
1272 cmd->scan_begin_arg) {
1273 cmd->scan_begin_arg =
1274 cmd->convert_arg *
1275 cmd->chanlist_len;
1276 err++;
1277 }
1278 tmp_arg = cmd->scan_begin_arg;
1279 /* calculate counter values that give desired timing */
1280 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1281 &(devpriv->divisor1),
1282 &(devpriv->divisor2),
1283 &(cmd->scan_begin_arg),
1284 cmd->flags & TRIG_ROUND_MASK);
1285 if (tmp_arg != cmd->scan_begin_arg)
1286 err++;
1287 }
1288 }
1289 }
1290
1291 if (err)
1292 return 4;
1293
1294 /* make sure user is not trying to mix unipolar and bipolar ranges */
1295 if (cmd->chanlist) {
1296 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
1297 for (i = 1; i < cmd->chanlist_len; i++) {
1298 if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
1299 comedi_error(dev,
1300 "unipolar and bipolar ranges cannot be mixed in the chanlist");
1301 err++;
1302 break;
1303 }
1304 }
1305 }
1306
1307 if (err)
1308 return 5;
1309
1310 return 0;
1311 }
1312
1313 /* analog input cmd interface */
1314
1315 /* first, some utility functions used in the main ai_do_cmd() */
1316
1317 /* returns appropriate bits for control register a, depending on command */
1318 static int control_a_bits(struct comedi_cmd cmd)
1319 {
1320 int control_a;
1321
1322 control_a = FFEN; /* enable fifo */
1323 if (cmd.stop_src == TRIG_EXT) {
1324 control_a |= ATEN;
1325 }
1326 switch (cmd.start_src) {
1327 case TRIG_EXT:
1328 control_a |= TGEN | CGSL;
1329 break;
1330 case TRIG_NOW:
1331 control_a |= CGEN;
1332 break;
1333 default:
1334 break;
1335 }
1336
1337 return control_a;
1338 }
1339
1340 /* returns appropriate bits for control register c, depending on command */
1341 static int control_c_bits(struct comedi_cmd cmd)
1342 {
1343 int control_c;
1344 int aref;
1345
1346 /* set clock source to internal or external, select analog reference,
1347 * select unipolar / bipolar
1348 */
1349 aref = CR_AREF(cmd.chanlist[0]);
1350 control_c = UQEN; /* enable upper qram addresses */
1351 if (aref != AREF_DIFF)
1352 control_c |= SD;
1353 if (aref == AREF_COMMON)
1354 control_c |= CMEN;
1355 /* if a unipolar range was selected */
1356 if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR)
1357 control_c |= UB;
1358 switch (cmd.scan_begin_src) {
1359 case TRIG_FOLLOW: /* not in burst mode */
1360 switch (cmd.convert_src) {
1361 case TRIG_TIMER:
1362 /* trig on cascaded counters */
1363 control_c |= IPCLK;
1364 break;
1365 case TRIG_EXT:
1366 /* trig on falling edge of external trigger */
1367 control_c |= XPCLK;
1368 break;
1369 default:
1370 break;
1371 }
1372 break;
1373 case TRIG_TIMER:
1374 /* burst mode with internal pacer clock */
1375 control_c |= BMDE | IPCLK;
1376 break;
1377 case TRIG_EXT:
1378 /* burst mode with external trigger */
1379 control_c |= BMDE | XPCLK;
1380 break;
1381 default:
1382 break;
1383 }
1384
1385 return control_c;
1386 }
1387
1388 /* sets up counters */
1389 static int setup_counters(struct comedi_device *dev, struct comedi_cmd cmd)
1390 {
1391 /* setup cascaded counters for conversion/scan frequency */
1392 switch (cmd.scan_begin_src) {
1393 case TRIG_FOLLOW: /* not in burst mode */
1394 if (cmd.convert_src == TRIG_TIMER) {
1395 /* set conversion frequency */
1396 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1397 &(devpriv->divisor1), &(devpriv->divisor2),
1398 &(cmd.convert_arg),
1399 cmd.flags & TRIG_ROUND_MASK);
1400 if (das1800_set_frequency(dev) < 0) {
1401 return -1;
1402 }
1403 }
1404 break;
1405 case TRIG_TIMER: /* in burst mode */
1406 /* set scan frequency */
1407 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1),
1408 &(devpriv->divisor2), &(cmd.scan_begin_arg),
1409 cmd.flags & TRIG_ROUND_MASK);
1410 if (das1800_set_frequency(dev) < 0) {
1411 return -1;
1412 }
1413 break;
1414 default:
1415 break;
1416 }
1417
1418 /* setup counter 0 for 'about triggering' */
1419 if (cmd.stop_src == TRIG_EXT) {
1420 /* load counter 0 in mode 0 */
1421 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1422 }
1423
1424 return 0;
1425 }
1426
1427 /* sets up dma */
1428 static void setup_dma(struct comedi_device *dev, struct comedi_cmd cmd)
1429 {
1430 unsigned long lock_flags;
1431 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1432
1433 if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1434 return;
1435
1436 /* determine a reasonable dma transfer size */
1437 devpriv->dma_transfer_size = suggest_transfer_size(&cmd);
1438 lock_flags = claim_dma_lock();
1439 disable_dma(devpriv->dma0);
1440 /* clear flip-flop to make sure 2-byte registers for
1441 * count and address get set correctly */
1442 clear_dma_ff(devpriv->dma0);
1443 set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
1444 /* set appropriate size of transfer */
1445 set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1446 devpriv->dma_current = devpriv->dma0;
1447 devpriv->dma_current_buf = devpriv->ai_buf0;
1448 enable_dma(devpriv->dma0);
1449 /* set up dual dma if appropriate */
1450 if (dual_dma) {
1451 disable_dma(devpriv->dma1);
1452 /* clear flip-flop to make sure 2-byte registers for
1453 * count and address get set correctly */
1454 clear_dma_ff(devpriv->dma1);
1455 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
1456 /* set appropriate size of transfer */
1457 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1458 enable_dma(devpriv->dma1);
1459 }
1460 release_dma_lock(lock_flags);
1461
1462 return;
1463 }
1464
1465 /* programs channel/gain list into card */
1466 static void program_chanlist(struct comedi_device *dev, struct comedi_cmd cmd)
1467 {
1468 int i, n, chan_range;
1469 unsigned long irq_flags;
1470 const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */
1471 const int range_bitshift = 8;
1472
1473 n = cmd.chanlist_len;
1474 /* spinlock protects indirect addressing */
1475 spin_lock_irqsave(&dev->spinlock, irq_flags);
1476 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1477 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */
1478 /* make channel / gain list */
1479 for (i = 0; i < n; i++) {
1480 chan_range =
1481 CR_CHAN(cmd.chanlist[i]) | ((CR_RANGE(cmd.
1482 chanlist[i]) & range_mask) <<
1483 range_bitshift);
1484 outw(chan_range, dev->iobase + DAS1800_QRAM);
1485 }
1486 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1487 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1488
1489 return;
1490 }
1491
1492 /* analog input do_cmd */
1493 static int das1800_ai_do_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
1494 {
1495 int ret;
1496 int control_a, control_c;
1497 struct comedi_async *async = s->async;
1498 struct comedi_cmd cmd = async->cmd;
1499
1500 if (!dev->irq) {
1501 comedi_error(dev,
1502 "no irq assigned for das-1800, cannot do hardware conversions");
1503 return -1;
1504 }
1505
1506 /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1507 * (because dma in handler is unsafe at hard real-time priority) */
1508 if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT)) {
1509 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1510 } else {
1511 devpriv->irq_dma_bits |= devpriv->dma_bits;
1512 }
1513 /* interrupt on end of conversion for TRIG_WAKE_EOS */
1514 if (cmd.flags & TRIG_WAKE_EOS) {
1515 /* interrupt fifo not empty */
1516 devpriv->irq_dma_bits &= ~FIMD;
1517 } else {
1518 /* interrupt fifo half full */
1519 devpriv->irq_dma_bits |= FIMD;
1520 }
1521 /* determine how many conversions we need */
1522 if (cmd.stop_src == TRIG_COUNT) {
1523 devpriv->count = cmd.stop_arg * cmd.chanlist_len;
1524 }
1525
1526 das1800_cancel(dev, s);
1527
1528 /* determine proper bits for control registers */
1529 control_a = control_a_bits(cmd);
1530 control_c = control_c_bits(cmd);
1531
1532 /* setup card and start */
1533 program_chanlist(dev, cmd);
1534 ret = setup_counters(dev, cmd);
1535 if (ret < 0) {
1536 comedi_error(dev, "Error setting up counters");
1537 return ret;
1538 }
1539 setup_dma(dev, cmd);
1540 outb(control_c, dev->iobase + DAS1800_CONTROL_C);
1541 /* set conversion rate and length for burst mode */
1542 if (control_c & BMDE) {
1543 /* program conversion period with number of microseconds minus 1 */
1544 outb(cmd.convert_arg / 1000 - 1,
1545 dev->iobase + DAS1800_BURST_RATE);
1546 outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1547 }
1548 outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */
1549 outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */
1550 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1551
1552 return 0;
1553 }
1554
1555 /* read analog input */
1556 static int das1800_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
1557 struct comedi_insn *insn, unsigned int *data)
1558 {
1559 int i, n;
1560 int chan, range, aref, chan_range;
1561 int timeout = 1000;
1562 short dpnt;
1563 int conv_flags = 0;
1564 unsigned long irq_flags;
1565
1566 /* set up analog reference and unipolar / bipolar mode */
1567 aref = CR_AREF(insn->chanspec);
1568 conv_flags |= UQEN;
1569 if (aref != AREF_DIFF)
1570 conv_flags |= SD;
1571 if (aref == AREF_COMMON)
1572 conv_flags |= CMEN;
1573 /* if a unipolar range was selected */
1574 if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1575 conv_flags |= UB;
1576
1577 outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */
1578 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1579 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */
1580 outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1581
1582 chan = CR_CHAN(insn->chanspec);
1583 /* mask of unipolar/bipolar bit from range */
1584 range = CR_RANGE(insn->chanspec) & 0x3;
1585 chan_range = chan | (range << 8);
1586 spin_lock_irqsave(&dev->spinlock, irq_flags);
1587 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1588 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */
1589 outw(chan_range, dev->iobase + DAS1800_QRAM);
1590 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1591 outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */
1592
1593 for (n = 0; n < insn->n; n++) {
1594 /* trigger conversion */
1595 outb(0, dev->iobase + DAS1800_FIFO);
1596 for (i = 0; i < timeout; i++) {
1597 if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1598 break;
1599 }
1600 if (i == timeout) {
1601 comedi_error(dev, "timeout");
1602 return -ETIME;
1603 }
1604 dpnt = inw(dev->iobase + DAS1800_FIFO);
1605 /* shift data to offset binary for bipolar ranges */
1606 if ((conv_flags & UB) == 0)
1607 dpnt += 1 << (thisboard->resolution - 1);
1608 data[n] = dpnt;
1609 }
1610 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1611
1612 return n;
1613 }
1614
1615 /* writes to an analog output channel */
1616 static int das1800_ao_winsn(struct comedi_device *dev, struct comedi_subdevice *s,
1617 struct comedi_insn *insn, unsigned int *data)
1618 {
1619 int chan = CR_CHAN(insn->chanspec);
1620 /* int range = CR_RANGE(insn->chanspec); */
1621 int update_chan = thisboard->ao_n_chan - 1;
1622 short output;
1623 unsigned long irq_flags;
1624
1625 /* card expects two's complement data */
1626 output = data[0] - (1 << (thisboard->resolution - 1));
1627 /* if the write is to the 'update' channel, we need to remember its value */
1628 if (chan == update_chan)
1629 devpriv->ao_update_bits = output;
1630 /* write to channel */
1631 spin_lock_irqsave(&dev->spinlock, irq_flags);
1632 outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */
1633 outw(output, dev->iobase + DAS1800_DAC);
1634 /* now we need to write to 'update' channel to update all dac channels */
1635 if (chan != update_chan) {
1636 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */
1637 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1638 }
1639 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1640
1641 return 1;
1642 }
1643
1644 /* reads from digital input channels */
1645 static int das1800_di_rbits(struct comedi_device *dev, struct comedi_subdevice *s,
1646 struct comedi_insn *insn, unsigned int *data)
1647 {
1648
1649 data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1650 data[0] = 0;
1651
1652 return 2;
1653 }
1654
1655 /* writes to digital output channels */
1656 static int das1800_do_wbits(struct comedi_device *dev, struct comedi_subdevice *s,
1657 struct comedi_insn *insn, unsigned int *data)
1658 {
1659 unsigned int wbits;
1660
1661 /* only set bits that have been masked */
1662 data[0] &= (1 << s->n_chan) - 1;
1663 wbits = devpriv->do_bits;
1664 wbits &= ~data[0];
1665 wbits |= data[0] & data[1];
1666 devpriv->do_bits = wbits;
1667
1668 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1669
1670 data[1] = devpriv->do_bits;
1671
1672 return 2;
1673 }
1674
1675 /* loads counters with divisor1, divisor2 from private structure */
1676 static int das1800_set_frequency(struct comedi_device *dev)
1677 {
1678 int err = 0;
1679
1680 /* counter 1, mode 2 */
1681 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
1682 2))
1683 err++;
1684 /* counter 2, mode 2 */
1685 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
1686 2))
1687 err++;
1688 if (err)
1689 return -1;
1690
1691 return 0;
1692 }
1693
1694 /* converts requested conversion timing to timing compatible with
1695 * hardware, used only when card is in 'burst mode'
1696 */
1697 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
1698 {
1699 unsigned int micro_sec;
1700
1701 /* in burst mode, the maximum conversion time is 64 microseconds */
1702 if (convert_arg > 64000)
1703 convert_arg = 64000;
1704
1705 /* the conversion time must be an integral number of microseconds */
1706 switch (round_mode) {
1707 case TRIG_ROUND_NEAREST:
1708 default:
1709 micro_sec = (convert_arg + 500) / 1000;
1710 break;
1711 case TRIG_ROUND_DOWN:
1712 micro_sec = convert_arg / 1000;
1713 break;
1714 case TRIG_ROUND_UP:
1715 micro_sec = (convert_arg - 1) / 1000 + 1;
1716 break;
1717 }
1718
1719 /* return number of nanoseconds */
1720 return micro_sec * 1000;
1721 }
1722
1723 /* utility function that suggests a dma transfer size based on the conversion period 'ns' */
1724 static unsigned int suggest_transfer_size(struct comedi_cmd *cmd)
1725 {
1726 unsigned int size = DMA_BUF_SIZE;
1727 static const int sample_size = 2; /* size in bytes of one sample from board */
1728 unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */
1729 unsigned int max_size; /* maximum size we will allow for a transfer */
1730
1731 /* make dma buffer fill in 0.3 seconds for timed modes */
1732 switch (cmd->scan_begin_src) {
1733 case TRIG_FOLLOW: /* not in burst mode */
1734 if (cmd->convert_src == TRIG_TIMER)
1735 size = (fill_time / cmd->convert_arg) * sample_size;
1736 break;
1737 case TRIG_TIMER:
1738 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
1739 sample_size;
1740 break;
1741 default:
1742 size = DMA_BUF_SIZE;
1743 break;
1744 }
1745
1746 /* set a minimum and maximum size allowed */
1747 max_size = DMA_BUF_SIZE;
1748 /* if we are taking limited number of conversions, limit transfer size to that */
1749 if (cmd->stop_src == TRIG_COUNT &&
1750 cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
1751 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1752
1753 if (size > max_size)
1754 size = max_size;
1755 if (size < sample_size)
1756 size = sample_size;
1757
1758 return size;
1759 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree