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Staging: comedi: add #include <linux/io.h> to a bunch of drivers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / staging / comedi / drivers / das1800.c
blob9fc28bfb672723d24fa2b7ebf7e86bb507ad7151
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 static int das1800_attach(struct comedi_device *dev,
187 struct comedi_devconfig *it);
188 static int das1800_detach(struct comedi_device *dev);
189 static int das1800_probe(struct comedi_device *dev);
190 static int das1800_cancel(struct comedi_device *dev,
191 struct comedi_subdevice *s);
192 static irqreturn_t das1800_interrupt(int irq, void *d);
193 static int das1800_ai_poll(struct comedi_device *dev,
194 struct comedi_subdevice *s);
195 static void das1800_ai_handler(struct comedi_device *dev);
196 static void das1800_handle_dma(struct comedi_device *dev,
197 struct comedi_subdevice *s, unsigned int status);
198 static void das1800_flush_dma(struct comedi_device *dev,
199 struct comedi_subdevice *s);
200 static void das1800_flush_dma_channel(struct comedi_device *dev,
201 struct comedi_subdevice *s,
202 unsigned int channel, uint16_t * buffer);
203 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
204 struct comedi_subdevice *s);
205 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
206 struct comedi_subdevice *s);
207 static int das1800_ai_do_cmdtest(struct comedi_device *dev,
208 struct comedi_subdevice *s,
209 struct comedi_cmd *cmd);
210 static int das1800_ai_do_cmd(struct comedi_device *dev,
211 struct comedi_subdevice *s);
212 static int das1800_ai_rinsn(struct comedi_device *dev,
213 struct comedi_subdevice *s,
214 struct comedi_insn *insn, unsigned int *data);
215 static int das1800_ao_winsn(struct comedi_device *dev,
216 struct comedi_subdevice *s,
217 struct comedi_insn *insn, unsigned int *data);
218 static int das1800_di_rbits(struct comedi_device *dev,
219 struct comedi_subdevice *s,
220 struct comedi_insn *insn, unsigned int *data);
221 static int das1800_do_wbits(struct comedi_device *dev,
222 struct comedi_subdevice *s,
223 struct comedi_insn *insn, unsigned int *data);
224
225 static int das1800_set_frequency(struct comedi_device *dev);
226 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode);
227 static unsigned int suggest_transfer_size(struct comedi_cmd *cmd);
228
229 /* analog input ranges */
230 static const struct comedi_lrange range_ai_das1801 = {
231 8,
232 {
233 RANGE(-5, 5),
234 RANGE(-1, 1),
235 RANGE(-0.1, 0.1),
236 RANGE(-0.02, 0.02),
237 RANGE(0, 5),
238 RANGE(0, 1),
239 RANGE(0, 0.1),
240 RANGE(0, 0.02),
241 }
242 };
243
244 static const struct comedi_lrange range_ai_das1802 = {
245 8,
246 {
247 RANGE(-10, 10),
248 RANGE(-5, 5),
249 RANGE(-2.5, 2.5),
250 RANGE(-1.25, 1.25),
251 RANGE(0, 10),
252 RANGE(0, 5),
253 RANGE(0, 2.5),
254 RANGE(0, 1.25),
255 }
256 };
257
258 struct das1800_board {
259 const char *name;
260 int ai_speed; /* max conversion period in nanoseconds */
261 int resolution; /* bits of ai resolution */
262 int qram_len; /* length of card's channel / gain queue */
263 int common; /* supports AREF_COMMON flag */
264 int do_n_chan; /* number of digital output channels */
265 int ao_ability; /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */
266 int ao_n_chan; /* number of analog out channels */
267 const struct comedi_lrange *range_ai; /* available input ranges */
268 };
269
270 /* Warning: the maximum conversion speeds listed below are
271 * not always achievable depending on board setup (see
272 * user manual.)
273 */
274 static const struct das1800_board das1800_boards[] = {
275 {
276 .name = "das-1701st",
277 .ai_speed = 6250,
278 .resolution = 12,
279 .qram_len = 256,
280 .common = 1,
281 .do_n_chan = 4,
282 .ao_ability = 0,
283 .ao_n_chan = 0,
284 .range_ai = &range_ai_das1801,
285 },
286 {
287 .name = "das-1701st-da",
288 .ai_speed = 6250,
289 .resolution = 12,
290 .qram_len = 256,
291 .common = 1,
292 .do_n_chan = 4,
293 .ao_ability = 1,
294 .ao_n_chan = 4,
295 .range_ai = &range_ai_das1801,
296 },
297 {
298 .name = "das-1702st",
299 .ai_speed = 6250,
300 .resolution = 12,
301 .qram_len = 256,
302 .common = 1,
303 .do_n_chan = 4,
304 .ao_ability = 0,
305 .ao_n_chan = 0,
306 .range_ai = &range_ai_das1802,
307 },
308 {
309 .name = "das-1702st-da",
310 .ai_speed = 6250,
311 .resolution = 12,
312 .qram_len = 256,
313 .common = 1,
314 .do_n_chan = 4,
315 .ao_ability = 1,
316 .ao_n_chan = 4,
317 .range_ai = &range_ai_das1802,
318 },
319 {
320 .name = "das-1702hr",
321 .ai_speed = 20000,
322 .resolution = 16,
323 .qram_len = 256,
324 .common = 1,
325 .do_n_chan = 4,
326 .ao_ability = 0,
327 .ao_n_chan = 0,
328 .range_ai = &range_ai_das1802,
329 },
330 {
331 .name = "das-1702hr-da",
332 .ai_speed = 20000,
333 .resolution = 16,
334 .qram_len = 256,
335 .common = 1,
336 .do_n_chan = 4,
337 .ao_ability = 1,
338 .ao_n_chan = 2,
339 .range_ai = &range_ai_das1802,
340 },
341 {
342 .name = "das-1701ao",
343 .ai_speed = 6250,
344 .resolution = 12,
345 .qram_len = 256,
346 .common = 1,
347 .do_n_chan = 4,
348 .ao_ability = 2,
349 .ao_n_chan = 2,
350 .range_ai = &range_ai_das1801,
351 },
352 {
353 .name = "das-1702ao",
354 .ai_speed = 6250,
355 .resolution = 12,
356 .qram_len = 256,
357 .common = 1,
358 .do_n_chan = 4,
359 .ao_ability = 2,
360 .ao_n_chan = 2,
361 .range_ai = &range_ai_das1802,
362 },
363 {
364 .name = "das-1801st",
365 .ai_speed = 3000,
366 .resolution = 12,
367 .qram_len = 256,
368 .common = 1,
369 .do_n_chan = 4,
370 .ao_ability = 0,
371 .ao_n_chan = 0,
372 .range_ai = &range_ai_das1801,
373 },
374 {
375 .name = "das-1801st-da",
376 .ai_speed = 3000,
377 .resolution = 12,
378 .qram_len = 256,
379 .common = 1,
380 .do_n_chan = 4,
381 .ao_ability = 0,
382 .ao_n_chan = 4,
383 .range_ai = &range_ai_das1801,
384 },
385 {
386 .name = "das-1802st",
387 .ai_speed = 3000,
388 .resolution = 12,
389 .qram_len = 256,
390 .common = 1,
391 .do_n_chan = 4,
392 .ao_ability = 0,
393 .ao_n_chan = 0,
394 .range_ai = &range_ai_das1802,
395 },
396 {
397 .name = "das-1802st-da",
398 .ai_speed = 3000,
399 .resolution = 12,
400 .qram_len = 256,
401 .common = 1,
402 .do_n_chan = 4,
403 .ao_ability = 1,
404 .ao_n_chan = 4,
405 .range_ai = &range_ai_das1802,
406 },
407 {
408 .name = "das-1802hr",
409 .ai_speed = 10000,
410 .resolution = 16,
411 .qram_len = 256,
412 .common = 1,
413 .do_n_chan = 4,
414 .ao_ability = 0,
415 .ao_n_chan = 0,
416 .range_ai = &range_ai_das1802,
417 },
418 {
419 .name = "das-1802hr-da",
420 .ai_speed = 10000,
421 .resolution = 16,
422 .qram_len = 256,
423 .common = 1,
424 .do_n_chan = 4,
425 .ao_ability = 1,
426 .ao_n_chan = 2,
427 .range_ai = &range_ai_das1802,
428 },
429 {
430 .name = "das-1801hc",
431 .ai_speed = 3000,
432 .resolution = 12,
433 .qram_len = 64,
434 .common = 0,
435 .do_n_chan = 8,
436 .ao_ability = 1,
437 .ao_n_chan = 2,
438 .range_ai = &range_ai_das1801,
439 },
440 {
441 .name = "das-1802hc",
442 .ai_speed = 3000,
443 .resolution = 12,
444 .qram_len = 64,
445 .common = 0,
446 .do_n_chan = 8,
447 .ao_ability = 1,
448 .ao_n_chan = 2,
449 .range_ai = &range_ai_das1802,
450 },
451 {
452 .name = "das-1801ao",
453 .ai_speed = 3000,
454 .resolution = 12,
455 .qram_len = 256,
456 .common = 1,
457 .do_n_chan = 4,
458 .ao_ability = 2,
459 .ao_n_chan = 2,
460 .range_ai = &range_ai_das1801,
461 },
462 {
463 .name = "das-1802ao",
464 .ai_speed = 3000,
465 .resolution = 12,
466 .qram_len = 256,
467 .common = 1,
468 .do_n_chan = 4,
469 .ao_ability = 2,
470 .ao_n_chan = 2,
471 .range_ai = &range_ai_das1802,
472 },
473 };
474
475 /*
476 * Useful for shorthand access to the particular board structure
477 */
478 #define thisboard ((const struct das1800_board *)dev->board_ptr)
479
480 struct das1800_private {
481 volatile unsigned int count; /* number of data points left to be taken */
482 unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */
483 unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */
484 int do_bits; /* digital output bits */
485 int irq_dma_bits; /* bits for control register b */
486 /* dma bits for control register b, stored so that dma can be
487 * turned on and off */
488 int dma_bits;
489 unsigned int dma0; /* dma channels used */
490 unsigned int dma1;
491 volatile unsigned int dma_current; /* dma channel currently in use */
492 uint16_t *ai_buf0; /* pointers to dma buffers */
493 uint16_t *ai_buf1;
494 uint16_t *dma_current_buf; /* pointer to dma buffer currently being used */
495 unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
496 unsigned long iobase2; /* secondary io address used for analog out on 'ao' boards */
497 short ao_update_bits; /* remembers the last write to the 'update' dac */
498 };
499
500 #define devpriv ((struct das1800_private *)dev->private)
501
502 /* analog out range for boards with basic analog out */
503 static const struct comedi_lrange range_ao_1 = {
504 1,
505 {
506 RANGE(-10, 10),
507 }
508 };
509
510 /* analog out range for 'ao' boards */
511 /*
512 static const struct comedi_lrange range_ao_2 = {
513 2,
514 {
515 RANGE(-10, 10),
516 RANGE(-5, 5),
517 }
518 };
519 */
520
521 static struct comedi_driver driver_das1800 = {
522 .driver_name = "das1800",
523 .module = THIS_MODULE,
524 .attach = das1800_attach,
525 .detach = das1800_detach,
526 .num_names = ARRAY_SIZE(das1800_boards),
527 .board_name = &das1800_boards[0].name,
528 .offset = sizeof(struct das1800_board),
529 };
530
531 /*
532 * A convenient macro that defines init_module() and cleanup_module(),
533 * as necessary.
534 */
535 static int __init driver_das1800_init_module(void)
536 {
537 return comedi_driver_register(&driver_das1800);
538 }
539
540 static void __exit driver_das1800_cleanup_module(void)
541 {
542 comedi_driver_unregister(&driver_das1800);
543 }
544
545 module_init(driver_das1800_init_module);
546 module_exit(driver_das1800_cleanup_module);
547
548 static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
549 unsigned int dma1)
550 {
551 unsigned long flags;
552
553 /* need an irq to do dma */
554 if (dev->irq && dma0) {
555 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
556 switch ((dma0 & 0x7) | (dma1 << 4)) {
557 case 0x5: /* dma0 == 5 */
558 devpriv->dma_bits |= DMA_CH5;
559 break;
560 case 0x6: /* dma0 == 6 */
561 devpriv->dma_bits |= DMA_CH6;
562 break;
563 case 0x7: /* dma0 == 7 */
564 devpriv->dma_bits |= DMA_CH7;
565 break;
566 case 0x65: /* dma0 == 5, dma1 == 6 */
567 devpriv->dma_bits |= DMA_CH5_CH6;
568 break;
569 case 0x76: /* dma0 == 6, dma1 == 7 */
570 devpriv->dma_bits |= DMA_CH6_CH7;
571 break;
572 case 0x57: /* dma0 == 7, dma1 == 5 */
573 devpriv->dma_bits |= DMA_CH7_CH5;
574 break;
575 default:
576 printk(" only supports dma channels 5 through 7\n"
577 " Dual dma only allows the following combinations:\n"
578 " dma 5,6 / 6,7 / or 7,5\n");
579 return -EINVAL;
580 break;
581 }
582 if (request_dma(dma0, driver_das1800.driver_name)) {
583 printk(" failed to allocate dma channel %i\n", dma0);
584 return -EINVAL;
585 }
586 devpriv->dma0 = dma0;
587 devpriv->dma_current = dma0;
588 if (dma1) {
589 if (request_dma(dma1, driver_das1800.driver_name)) {
590 printk(" failed to allocate dma channel %i\n",
591 dma1);
592 return -EINVAL;
593 }
594 devpriv->dma1 = dma1;
595 }
596 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
597 if (devpriv->ai_buf0 == NULL)
598 return -ENOMEM;
599 devpriv->dma_current_buf = devpriv->ai_buf0;
600 if (dma1) {
601 devpriv->ai_buf1 =
602 kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
603 if (devpriv->ai_buf1 == NULL)
604 return -ENOMEM;
605 }
606 flags = claim_dma_lock();
607 disable_dma(devpriv->dma0);
608 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
609 if (dma1) {
610 disable_dma(devpriv->dma1);
611 set_dma_mode(devpriv->dma1, DMA_MODE_READ);
612 }
613 release_dma_lock(flags);
614 }
615 return 0;
616 }
617
618 static int das1800_attach(struct comedi_device *dev,
619 struct comedi_devconfig *it)
620 {
621 struct comedi_subdevice *s;
622 unsigned long iobase = it->options[0];
623 unsigned int irq = it->options[1];
624 unsigned int dma0 = it->options[2];
625 unsigned int dma1 = it->options[3];
626 unsigned long iobase2;
627 int board;
628 int retval;
629
630 /* allocate and initialize dev->private */
631 if (alloc_private(dev, sizeof(struct das1800_private)) < 0)
632 return -ENOMEM;
633
634 printk("comedi%d: %s: io 0x%lx", dev->minor, driver_das1800.driver_name,
635 iobase);
636 if (irq) {
637 printk(", irq %u", irq);
638 if (dma0) {
639 printk(", dma %u", dma0);
640 if (dma1)
641 printk(" and %u", dma1);
642 }
643 }
644 printk("\n");
645
646 if (iobase == 0) {
647 printk(" io base address required\n");
648 return -EINVAL;
649 }
650
651 /* check if io addresses are available */
652 if (!request_region(iobase, DAS1800_SIZE, driver_das1800.driver_name)) {
653 printk
654 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
655 iobase, iobase + DAS1800_SIZE - 1);
656 return -EIO;
657 }
658 dev->iobase = iobase;
659
660 board = das1800_probe(dev);
661 if (board < 0) {
662 printk(" unable to determine board type\n");
663 return -ENODEV;
664 }
665
666 dev->board_ptr = das1800_boards + board;
667 dev->board_name = thisboard->name;
668
669 /* if it is an 'ao' board with fancy analog out then we need extra io ports */
670 if (thisboard->ao_ability == 2) {
671 iobase2 = iobase + IOBASE2;
672 if (!request_region(iobase2, DAS1800_SIZE,
673 driver_das1800.driver_name)) {
674 printk
675 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
676 iobase2, iobase2 + DAS1800_SIZE - 1);
677 return -EIO;
678 }
679 devpriv->iobase2 = iobase2;
680 }
681
682 /* grab our IRQ */
683 if (irq) {
684 if (request_irq(irq, das1800_interrupt, 0,
685 driver_das1800.driver_name, dev)) {
686 printk(" unable to allocate irq %u\n", irq);
687 return -EINVAL;
688 }
689 }
690 dev->irq = irq;
691
692 /* set bits that tell card which irq to use */
693 switch (irq) {
694 case 0:
695 break;
696 case 3:
697 devpriv->irq_dma_bits |= 0x8;
698 break;
699 case 5:
700 devpriv->irq_dma_bits |= 0x10;
701 break;
702 case 7:
703 devpriv->irq_dma_bits |= 0x18;
704 break;
705 case 10:
706 devpriv->irq_dma_bits |= 0x28;
707 break;
708 case 11:
709 devpriv->irq_dma_bits |= 0x30;
710 break;
711 case 15:
712 devpriv->irq_dma_bits |= 0x38;
713 break;
714 default:
715 printk(" irq out of range\n");
716 return -EINVAL;
717 break;
718 }
719
720 retval = das1800_init_dma(dev, dma0, dma1);
721 if (retval < 0)
722 return retval;
723
724 if (devpriv->ai_buf0 == NULL) {
725 devpriv->ai_buf0 =
726 kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
727 if (devpriv->ai_buf0 == NULL)
728 return -ENOMEM;
729 }
730
731 if (alloc_subdevices(dev, 4) < 0)
732 return -ENOMEM;
733
734 /* analog input subdevice */
735 s = dev->subdevices + 0;
736 dev->read_subdev = s;
737 s->type = COMEDI_SUBD_AI;
738 s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
739 if (thisboard->common)
740 s->subdev_flags |= SDF_COMMON;
741 s->n_chan = thisboard->qram_len;
742 s->len_chanlist = thisboard->qram_len;
743 s->maxdata = (1 << thisboard->resolution) - 1;
744 s->range_table = thisboard->range_ai;
745 s->do_cmd = das1800_ai_do_cmd;
746 s->do_cmdtest = das1800_ai_do_cmdtest;
747 s->insn_read = das1800_ai_rinsn;
748 s->poll = das1800_ai_poll;
749 s->cancel = das1800_cancel;
750
751 /* analog out */
752 s = dev->subdevices + 1;
753 if (thisboard->ao_ability == 1) {
754 s->type = COMEDI_SUBD_AO;
755 s->subdev_flags = SDF_WRITABLE;
756 s->n_chan = thisboard->ao_n_chan;
757 s->maxdata = (1 << thisboard->resolution) - 1;
758 s->range_table = &range_ao_1;
759 s->insn_write = das1800_ao_winsn;
760 } else {
761 s->type = COMEDI_SUBD_UNUSED;
762 }
763
764 /* di */
765 s = dev->subdevices + 2;
766 s->type = COMEDI_SUBD_DI;
767 s->subdev_flags = SDF_READABLE;
768 s->n_chan = 4;
769 s->maxdata = 1;
770 s->range_table = &range_digital;
771 s->insn_bits = das1800_di_rbits;
772
773 /* do */
774 s = dev->subdevices + 3;
775 s->type = COMEDI_SUBD_DO;
776 s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
777 s->n_chan = thisboard->do_n_chan;
778 s->maxdata = 1;
779 s->range_table = &range_digital;
780 s->insn_bits = das1800_do_wbits;
781
782 das1800_cancel(dev, dev->read_subdev);
783
784 /* initialize digital out channels */
785 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
786
787 /* initialize analog out channels */
788 if (thisboard->ao_ability == 1) {
789 /* select 'update' dac channel for baseAddress + 0x0 */
790 outb(DAC(thisboard->ao_n_chan - 1),
791 dev->iobase + DAS1800_SELECT);
792 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
793 }
794
795 return 0;
796 };
797
798 static int das1800_detach(struct comedi_device *dev)
799 {
800 /* only free stuff if it has been allocated by _attach */
801 if (dev->iobase)
802 release_region(dev->iobase, DAS1800_SIZE);
803 if (dev->irq)
804 free_irq(dev->irq, dev);
805 if (dev->private) {
806 if (devpriv->iobase2)
807 release_region(devpriv->iobase2, DAS1800_SIZE);
808 if (devpriv->dma0)
809 free_dma(devpriv->dma0);
810 if (devpriv->dma1)
811 free_dma(devpriv->dma1);
812 kfree(devpriv->ai_buf0);
813 kfree(devpriv->ai_buf1);
814 }
815
816 printk("comedi%d: %s: remove\n", dev->minor,
817 driver_das1800.driver_name);
818
819 return 0;
820 };
821
822 /* probes and checks das-1800 series board type
823 */
824 static int das1800_probe(struct comedi_device *dev)
825 {
826 int id;
827 int board;
828
829 id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */
830 board = ((struct das1800_board *)dev->board_ptr) - das1800_boards;
831
832 switch (id) {
833 case 0x3:
834 if (board == das1801st_da || board == das1802st_da ||
835 board == das1701st_da || board == das1702st_da) {
836 printk(" Board model: %s\n",
837 das1800_boards[board].name);
838 return board;
839 }
840 printk
841 (" Board model (probed, not recommended): das-1800st-da series\n");
842 return das1801st;
843 break;
844 case 0x4:
845 if (board == das1802hr_da || board == das1702hr_da) {
846 printk(" Board model: %s\n",
847 das1800_boards[board].name);
848 return board;
849 }
850 printk
851 (" Board model (probed, not recommended): das-1802hr-da\n");
852 return das1802hr;
853 break;
854 case 0x5:
855 if (board == das1801ao || board == das1802ao ||
856 board == das1701ao || board == das1702ao) {
857 printk(" Board model: %s\n",
858 das1800_boards[board].name);
859 return board;
860 }
861 printk
862 (" Board model (probed, not recommended): das-1800ao series\n");
863 return das1801ao;
864 break;
865 case 0x6:
866 if (board == das1802hr || board == das1702hr) {
867 printk(" Board model: %s\n",
868 das1800_boards[board].name);
869 return board;
870 }
871 printk(" Board model (probed, not recommended): das-1802hr\n");
872 return das1802hr;
873 break;
874 case 0x7:
875 if (board == das1801st || board == das1802st ||
876 board == das1701st || board == das1702st) {
877 printk(" Board model: %s\n",
878 das1800_boards[board].name);
879 return board;
880 }
881 printk
882 (" Board model (probed, not recommended): das-1800st series\n");
883 return das1801st;
884 break;
885 case 0x8:
886 if (board == das1801hc || board == das1802hc) {
887 printk(" Board model: %s\n",
888 das1800_boards[board].name);
889 return board;
890 }
891 printk
892 (" Board model (probed, not recommended): das-1800hc series\n");
893 return das1801hc;
894 break;
895 default:
896 printk
897 (" Board model: probe returned 0x%x (unknown, please report)\n",
898 id);
899 return board;
900 break;
901 }
902 return -1;
903 }
904
905 static int das1800_ai_poll(struct comedi_device *dev,
906 struct comedi_subdevice *s)
907 {
908 unsigned long flags;
909
910 /* prevent race with interrupt handler */
911 spin_lock_irqsave(&dev->spinlock, flags);
912 das1800_ai_handler(dev);
913 spin_unlock_irqrestore(&dev->spinlock, flags);
914
915 return s->async->buf_write_count - s->async->buf_read_count;
916 }
917
918 static irqreturn_t das1800_interrupt(int irq, void *d)
919 {
920 struct comedi_device *dev = d;
921 unsigned int status;
922
923 if (dev->attached == 0) {
924 comedi_error(dev, "premature interrupt");
925 return IRQ_HANDLED;
926 }
927
928 /* Prevent race with das1800_ai_poll() on multi processor systems.
929 * Also protects indirect addressing in das1800_ai_handler */
930 spin_lock(&dev->spinlock);
931 status = inb(dev->iobase + DAS1800_STATUS);
932
933 /* if interrupt was not caused by das-1800 */
934 if (!(status & INT)) {
935 spin_unlock(&dev->spinlock);
936 return IRQ_NONE;
937 }
938 /* clear the interrupt status bit INT */
939 outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
940 /* handle interrupt */
941 das1800_ai_handler(dev);
942
943 spin_unlock(&dev->spinlock);
944 return IRQ_HANDLED;
945 }
946
947 /* the guts of the interrupt handler, that is shared with das1800_ai_poll */
948 static void das1800_ai_handler(struct comedi_device *dev)
949 {
950 struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */
951 struct comedi_async *async = s->async;
952 struct comedi_cmd *cmd = &async->cmd;
953 unsigned int status = inb(dev->iobase + DAS1800_STATUS);
954
955 async->events = 0;
956 /* select adc for base address + 0 */
957 outb(ADC, dev->iobase + DAS1800_SELECT);
958 /* dma buffer full */
959 if (devpriv->irq_dma_bits & DMA_ENABLED) {
960 /* look for data from dma transfer even if dma terminal count hasn't happened yet */
961 das1800_handle_dma(dev, s, status);
962 } else if (status & FHF) { /* if fifo half full */
963 das1800_handle_fifo_half_full(dev, s);
964 } else if (status & FNE) { /* if fifo not empty */
965 das1800_handle_fifo_not_empty(dev, s);
966 }
967
968 async->events |= COMEDI_CB_BLOCK;
969 /* if the card's fifo has overflowed */
970 if (status & OVF) {
971 /* clear OVF interrupt bit */
972 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
973 comedi_error(dev, "DAS1800 FIFO overflow");
974 das1800_cancel(dev, s);
975 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
976 comedi_event(dev, s);
977 return;
978 }
979 /* stop taking data if appropriate */
980 /* stop_src TRIG_EXT */
981 if (status & CT0TC) {
982 /* clear CT0TC interrupt bit */
983 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
984 /* make sure we get all remaining data from board before quitting */
985 if (devpriv->irq_dma_bits & DMA_ENABLED)
986 das1800_flush_dma(dev, s);
987 else
988 das1800_handle_fifo_not_empty(dev, s);
989 das1800_cancel(dev, s); /* disable hardware conversions */
990 async->events |= COMEDI_CB_EOA;
991 } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */
992 das1800_cancel(dev, s); /* disable hardware conversions */
993 async->events |= COMEDI_CB_EOA;
994 }
995
996 comedi_event(dev, s);
997
998 return;
999 }
1000
1001 static void das1800_handle_dma(struct comedi_device *dev,
1002 struct comedi_subdevice *s, unsigned int status)
1003 {
1004 unsigned long flags;
1005 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1006
1007 flags = claim_dma_lock();
1008 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1009 devpriv->dma_current_buf);
1010 /* re-enable dma channel */
1011 set_dma_addr(devpriv->dma_current,
1012 virt_to_bus(devpriv->dma_current_buf));
1013 set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
1014 enable_dma(devpriv->dma_current);
1015 release_dma_lock(flags);
1016
1017 if (status & DMATC) {
1018 /* clear DMATC interrupt bit */
1019 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
1020 /* switch dma channels for next time, if appropriate */
1021 if (dual_dma) {
1022 /* read data from the other channel next time */
1023 if (devpriv->dma_current == devpriv->dma0) {
1024 devpriv->dma_current = devpriv->dma1;
1025 devpriv->dma_current_buf = devpriv->ai_buf1;
1026 } else {
1027 devpriv->dma_current = devpriv->dma0;
1028 devpriv->dma_current_buf = devpriv->ai_buf0;
1029 }
1030 }
1031 }
1032
1033 return;
1034 }
1035
1036 static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
1037 uint16_t sample)
1038 {
1039 sample += 1 << (thisboard->resolution - 1);
1040 return sample;
1041 }
1042
1043 static void munge_data(struct comedi_device *dev, uint16_t * array,
1044 unsigned int num_elements)
1045 {
1046 unsigned int i;
1047 int unipolar;
1048
1049 /* see if card is using a unipolar or bipolar range so we can munge data correctly */
1050 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1051
1052 /* convert to unsigned type if we are in a bipolar mode */
1053 if (!unipolar) {
1054 for (i = 0; i < num_elements; i++) {
1055 array[i] = munge_bipolar_sample(dev, array[i]);
1056 }
1057 }
1058 }
1059
1060 /* Utility function used by das1800_flush_dma() and das1800_handle_dma().
1061 * Assumes dma lock is held */
1062 static void das1800_flush_dma_channel(struct comedi_device *dev,
1063 struct comedi_subdevice *s,
1064 unsigned int channel, uint16_t * buffer)
1065 {
1066 unsigned int num_bytes, num_samples;
1067 struct comedi_cmd *cmd = &s->async->cmd;
1068
1069 disable_dma(channel);
1070
1071 /* clear flip-flop to make sure 2-byte registers
1072 * get set correctly */
1073 clear_dma_ff(channel);
1074
1075 /* figure out how many points to read */
1076 num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
1077 num_samples = num_bytes / sizeof(short);
1078
1079 /* if we only need some of the points */
1080 if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
1081 num_samples = devpriv->count;
1082
1083 munge_data(dev, buffer, num_samples);
1084 cfc_write_array_to_buffer(s, buffer, num_bytes);
1085 if (s->async->cmd.stop_src == TRIG_COUNT)
1086 devpriv->count -= num_samples;
1087
1088 return;
1089 }
1090
1091 /* flushes remaining data from board when external trigger has stopped acquisition
1092 * and we are using dma transfers */
1093 static void das1800_flush_dma(struct comedi_device *dev,
1094 struct comedi_subdevice *s)
1095 {
1096 unsigned long flags;
1097 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1098
1099 flags = claim_dma_lock();
1100 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1101 devpriv->dma_current_buf);
1102
1103 if (dual_dma) {
1104 /* switch to other channel and flush it */
1105 if (devpriv->dma_current == devpriv->dma0) {
1106 devpriv->dma_current = devpriv->dma1;
1107 devpriv->dma_current_buf = devpriv->ai_buf1;
1108 } else {
1109 devpriv->dma_current = devpriv->dma0;
1110 devpriv->dma_current_buf = devpriv->ai_buf0;
1111 }
1112 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1113 devpriv->dma_current_buf);
1114 }
1115
1116 release_dma_lock(flags);
1117
1118 /* get any remaining samples in fifo */
1119 das1800_handle_fifo_not_empty(dev, s);
1120
1121 return;
1122 }
1123
1124 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
1125 struct comedi_subdevice *s)
1126 {
1127 int numPoints = 0; /* number of points to read */
1128 struct comedi_cmd *cmd = &s->async->cmd;
1129
1130 numPoints = FIFO_SIZE / 2;
1131 /* if we only need some of the points */
1132 if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
1133 numPoints = devpriv->count;
1134 insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
1135 munge_data(dev, devpriv->ai_buf0, numPoints);
1136 cfc_write_array_to_buffer(s, devpriv->ai_buf0,
1137 numPoints * sizeof(devpriv->ai_buf0[0]));
1138 if (cmd->stop_src == TRIG_COUNT)
1139 devpriv->count -= numPoints;
1140 return;
1141 }
1142
1143 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
1144 struct comedi_subdevice *s)
1145 {
1146 short dpnt;
1147 int unipolar;
1148 struct comedi_cmd *cmd = &s->async->cmd;
1149
1150 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1151
1152 while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
1153 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
1154 break;
1155 dpnt = inw(dev->iobase + DAS1800_FIFO);
1156 /* convert to unsigned type if we are in a bipolar mode */
1157 if (!unipolar) ;
1158 dpnt = munge_bipolar_sample(dev, dpnt);
1159 cfc_write_to_buffer(s, dpnt);
1160 if (cmd->stop_src == TRIG_COUNT)
1161 devpriv->count--;
1162 }
1163
1164 return;
1165 }
1166
1167 static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1168 {
1169 outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */
1170 outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */
1171 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */
1172 if (devpriv->dma0)
1173 disable_dma(devpriv->dma0);
1174 if (devpriv->dma1)
1175 disable_dma(devpriv->dma1);
1176 return 0;
1177 }
1178
1179 /* test analog input cmd */
1180 static int das1800_ai_do_cmdtest(struct comedi_device *dev,
1181 struct comedi_subdevice *s,
1182 struct comedi_cmd *cmd)
1183 {
1184 int err = 0;
1185 int tmp;
1186 unsigned int tmp_arg;
1187 int i;
1188 int unipolar;
1189
1190 /* step 1: make sure trigger sources are trivially valid */
1191
1192 tmp = cmd->start_src;
1193 cmd->start_src &= TRIG_NOW | TRIG_EXT;
1194 if (!cmd->start_src || tmp != cmd->start_src)
1195 err++;
1196
1197 tmp = cmd->scan_begin_src;
1198 cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT;
1199 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
1200 err++;
1201
1202 tmp = cmd->convert_src;
1203 cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
1204 if (!cmd->convert_src || tmp != cmd->convert_src)
1205 err++;
1206
1207 tmp = cmd->scan_end_src;
1208 cmd->scan_end_src &= TRIG_COUNT;
1209 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
1210 err++;
1211
1212 tmp = cmd->stop_src;
1213 cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE;
1214 if (!cmd->stop_src || tmp != cmd->stop_src)
1215 err++;
1216
1217 if (err)
1218 return 1;
1219
1220 /* step 2: make sure trigger sources are unique and mutually compatible */
1221
1222 /* uniqueness check */
1223 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
1224 err++;
1225 if (cmd->scan_begin_src != TRIG_FOLLOW &&
1226 cmd->scan_begin_src != TRIG_TIMER &&
1227 cmd->scan_begin_src != TRIG_EXT)
1228 err++;
1229 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
1230 err++;
1231 if (cmd->stop_src != TRIG_COUNT &&
1232 cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT)
1233 err++;
1234 /* compatibility check */
1235 if (cmd->scan_begin_src != TRIG_FOLLOW &&
1236 cmd->convert_src != TRIG_TIMER)
1237 err++;
1238
1239 if (err)
1240 return 2;
1241
1242 /* step 3: make sure arguments are trivially compatible */
1243
1244 if (cmd->start_arg != 0) {
1245 cmd->start_arg = 0;
1246 err++;
1247 }
1248 if (cmd->convert_src == TRIG_TIMER) {
1249 if (cmd->convert_arg < thisboard->ai_speed) {
1250 cmd->convert_arg = thisboard->ai_speed;
1251 err++;
1252 }
1253 }
1254 if (!cmd->chanlist_len) {
1255 cmd->chanlist_len = 1;
1256 err++;
1257 }
1258 if (cmd->scan_end_arg != cmd->chanlist_len) {
1259 cmd->scan_end_arg = cmd->chanlist_len;
1260 err++;
1261 }
1262
1263 switch (cmd->stop_src) {
1264 case TRIG_COUNT:
1265 if (!cmd->stop_arg) {
1266 cmd->stop_arg = 1;
1267 err++;
1268 }
1269 break;
1270 case TRIG_NONE:
1271 if (cmd->stop_arg != 0) {
1272 cmd->stop_arg = 0;
1273 err++;
1274 }
1275 break;
1276 default:
1277 break;
1278 }
1279
1280 if (err)
1281 return 3;
1282
1283 /* step 4: fix up any arguments */
1284
1285 if (cmd->convert_src == TRIG_TIMER) {
1286 /* if we are not in burst mode */
1287 if (cmd->scan_begin_src == TRIG_FOLLOW) {
1288 tmp_arg = cmd->convert_arg;
1289 /* calculate counter values that give desired timing */
1290 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1291 &(devpriv->divisor1),
1292 &(devpriv->divisor2),
1293 &(cmd->convert_arg),
1294 cmd->
1295 flags & TRIG_ROUND_MASK);
1296 if (tmp_arg != cmd->convert_arg)
1297 err++;
1298 }
1299 /* if we are in burst mode */
1300 else {
1301 /* check that convert_arg is compatible */
1302 tmp_arg = cmd->convert_arg;
1303 cmd->convert_arg =
1304 burst_convert_arg(cmd->convert_arg,
1305 cmd->flags & TRIG_ROUND_MASK);
1306 if (tmp_arg != cmd->convert_arg)
1307 err++;
1308
1309 if (cmd->scan_begin_src == TRIG_TIMER) {
1310 /* if scans are timed faster than conversion rate allows */
1311 if (cmd->convert_arg * cmd->chanlist_len >
1312 cmd->scan_begin_arg) {
1313 cmd->scan_begin_arg =
1314 cmd->convert_arg *
1315 cmd->chanlist_len;
1316 err++;
1317 }
1318 tmp_arg = cmd->scan_begin_arg;
1319 /* calculate counter values that give desired timing */
1320 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1321 &(devpriv->
1322 divisor1),
1323 &(devpriv->
1324 divisor2),
1325 &(cmd->
1326 scan_begin_arg),
1327 cmd->
1328 flags &
1329 TRIG_ROUND_MASK);
1330 if (tmp_arg != cmd->scan_begin_arg)
1331 err++;
1332 }
1333 }
1334 }
1335
1336 if (err)
1337 return 4;
1338
1339 /* make sure user is not trying to mix unipolar and bipolar ranges */
1340 if (cmd->chanlist) {
1341 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
1342 for (i = 1; i < cmd->chanlist_len; i++) {
1343 if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
1344 comedi_error(dev,
1345 "unipolar and bipolar ranges cannot be mixed in the chanlist");
1346 err++;
1347 break;
1348 }
1349 }
1350 }
1351
1352 if (err)
1353 return 5;
1354
1355 return 0;
1356 }
1357
1358 /* analog input cmd interface */
1359
1360 /* first, some utility functions used in the main ai_do_cmd() */
1361
1362 /* returns appropriate bits for control register a, depending on command */
1363 static int control_a_bits(struct comedi_cmd cmd)
1364 {
1365 int control_a;
1366
1367 control_a = FFEN; /* enable fifo */
1368 if (cmd.stop_src == TRIG_EXT) {
1369 control_a |= ATEN;
1370 }
1371 switch (cmd.start_src) {
1372 case TRIG_EXT:
1373 control_a |= TGEN | CGSL;
1374 break;
1375 case TRIG_NOW:
1376 control_a |= CGEN;
1377 break;
1378 default:
1379 break;
1380 }
1381
1382 return control_a;
1383 }
1384
1385 /* returns appropriate bits for control register c, depending on command */
1386 static int control_c_bits(struct comedi_cmd cmd)
1387 {
1388 int control_c;
1389 int aref;
1390
1391 /* set clock source to internal or external, select analog reference,
1392 * select unipolar / bipolar
1393 */
1394 aref = CR_AREF(cmd.chanlist[0]);
1395 control_c = UQEN; /* enable upper qram addresses */
1396 if (aref != AREF_DIFF)
1397 control_c |= SD;
1398 if (aref == AREF_COMMON)
1399 control_c |= CMEN;
1400 /* if a unipolar range was selected */
1401 if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR)
1402 control_c |= UB;
1403 switch (cmd.scan_begin_src) {
1404 case TRIG_FOLLOW: /* not in burst mode */
1405 switch (cmd.convert_src) {
1406 case TRIG_TIMER:
1407 /* trig on cascaded counters */
1408 control_c |= IPCLK;
1409 break;
1410 case TRIG_EXT:
1411 /* trig on falling edge of external trigger */
1412 control_c |= XPCLK;
1413 break;
1414 default:
1415 break;
1416 }
1417 break;
1418 case TRIG_TIMER:
1419 /* burst mode with internal pacer clock */
1420 control_c |= BMDE | IPCLK;
1421 break;
1422 case TRIG_EXT:
1423 /* burst mode with external trigger */
1424 control_c |= BMDE | XPCLK;
1425 break;
1426 default:
1427 break;
1428 }
1429
1430 return control_c;
1431 }
1432
1433 /* sets up counters */
1434 static int setup_counters(struct comedi_device *dev, struct comedi_cmd cmd)
1435 {
1436 /* setup cascaded counters for conversion/scan frequency */
1437 switch (cmd.scan_begin_src) {
1438 case TRIG_FOLLOW: /* not in burst mode */
1439 if (cmd.convert_src == TRIG_TIMER) {
1440 /* set conversion frequency */
1441 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1442 &(devpriv->divisor1),
1443 &(devpriv->divisor2),
1444 &(cmd.convert_arg),
1445 cmd.
1446 flags & TRIG_ROUND_MASK);
1447 if (das1800_set_frequency(dev) < 0) {
1448 return -1;
1449 }
1450 }
1451 break;
1452 case TRIG_TIMER: /* in burst mode */
1453 /* set scan frequency */
1454 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1),
1455 &(devpriv->divisor2),
1456 &(cmd.scan_begin_arg),
1457 cmd.flags & TRIG_ROUND_MASK);
1458 if (das1800_set_frequency(dev) < 0) {
1459 return -1;
1460 }
1461 break;
1462 default:
1463 break;
1464 }
1465
1466 /* setup counter 0 for 'about triggering' */
1467 if (cmd.stop_src == TRIG_EXT) {
1468 /* load counter 0 in mode 0 */
1469 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1470 }
1471
1472 return 0;
1473 }
1474
1475 /* sets up dma */
1476 static void setup_dma(struct comedi_device *dev, struct comedi_cmd cmd)
1477 {
1478 unsigned long lock_flags;
1479 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1480
1481 if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1482 return;
1483
1484 /* determine a reasonable dma transfer size */
1485 devpriv->dma_transfer_size = suggest_transfer_size(&cmd);
1486 lock_flags = claim_dma_lock();
1487 disable_dma(devpriv->dma0);
1488 /* clear flip-flop to make sure 2-byte registers for
1489 * count and address get set correctly */
1490 clear_dma_ff(devpriv->dma0);
1491 set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
1492 /* set appropriate size of transfer */
1493 set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1494 devpriv->dma_current = devpriv->dma0;
1495 devpriv->dma_current_buf = devpriv->ai_buf0;
1496 enable_dma(devpriv->dma0);
1497 /* set up dual dma if appropriate */
1498 if (dual_dma) {
1499 disable_dma(devpriv->dma1);
1500 /* clear flip-flop to make sure 2-byte registers for
1501 * count and address get set correctly */
1502 clear_dma_ff(devpriv->dma1);
1503 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
1504 /* set appropriate size of transfer */
1505 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1506 enable_dma(devpriv->dma1);
1507 }
1508 release_dma_lock(lock_flags);
1509
1510 return;
1511 }
1512
1513 /* programs channel/gain list into card */
1514 static void program_chanlist(struct comedi_device *dev, struct comedi_cmd cmd)
1515 {
1516 int i, n, chan_range;
1517 unsigned long irq_flags;
1518 const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */
1519 const int range_bitshift = 8;
1520
1521 n = cmd.chanlist_len;
1522 /* spinlock protects indirect addressing */
1523 spin_lock_irqsave(&dev->spinlock, irq_flags);
1524 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1525 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */
1526 /* make channel / gain list */
1527 for (i = 0; i < n; i++) {
1528 chan_range =
1529 CR_CHAN(cmd.
1530 chanlist[i]) | ((CR_RANGE(cmd.chanlist[i]) &
1531 range_mask) << range_bitshift);
1532 outw(chan_range, dev->iobase + DAS1800_QRAM);
1533 }
1534 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1535 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1536
1537 return;
1538 }
1539
1540 /* analog input do_cmd */
1541 static int das1800_ai_do_cmd(struct comedi_device *dev,
1542 struct comedi_subdevice *s)
1543 {
1544 int ret;
1545 int control_a, control_c;
1546 struct comedi_async *async = s->async;
1547 struct comedi_cmd cmd = async->cmd;
1548
1549 if (!dev->irq) {
1550 comedi_error(dev,
1551 "no irq assigned for das-1800, cannot do hardware conversions");
1552 return -1;
1553 }
1554
1555 /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1556 * (because dma in handler is unsafe at hard real-time priority) */
1557 if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT)) {
1558 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1559 } else {
1560 devpriv->irq_dma_bits |= devpriv->dma_bits;
1561 }
1562 /* interrupt on end of conversion for TRIG_WAKE_EOS */
1563 if (cmd.flags & TRIG_WAKE_EOS) {
1564 /* interrupt fifo not empty */
1565 devpriv->irq_dma_bits &= ~FIMD;
1566 } else {
1567 /* interrupt fifo half full */
1568 devpriv->irq_dma_bits |= FIMD;
1569 }
1570 /* determine how many conversions we need */
1571 if (cmd.stop_src == TRIG_COUNT) {
1572 devpriv->count = cmd.stop_arg * cmd.chanlist_len;
1573 }
1574
1575 das1800_cancel(dev, s);
1576
1577 /* determine proper bits for control registers */
1578 control_a = control_a_bits(cmd);
1579 control_c = control_c_bits(cmd);
1580
1581 /* setup card and start */
1582 program_chanlist(dev, cmd);
1583 ret = setup_counters(dev, cmd);
1584 if (ret < 0) {
1585 comedi_error(dev, "Error setting up counters");
1586 return ret;
1587 }
1588 setup_dma(dev, cmd);
1589 outb(control_c, dev->iobase + DAS1800_CONTROL_C);
1590 /* set conversion rate and length for burst mode */
1591 if (control_c & BMDE) {
1592 /* program conversion period with number of microseconds minus 1 */
1593 outb(cmd.convert_arg / 1000 - 1,
1594 dev->iobase + DAS1800_BURST_RATE);
1595 outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1596 }
1597 outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */
1598 outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */
1599 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1600
1601 return 0;
1602 }
1603
1604 /* read analog input */
1605 static int das1800_ai_rinsn(struct comedi_device *dev,
1606 struct comedi_subdevice *s,
1607 struct comedi_insn *insn, unsigned int *data)
1608 {
1609 int i, n;
1610 int chan, range, aref, chan_range;
1611 int timeout = 1000;
1612 short dpnt;
1613 int conv_flags = 0;
1614 unsigned long irq_flags;
1615
1616 /* set up analog reference and unipolar / bipolar mode */
1617 aref = CR_AREF(insn->chanspec);
1618 conv_flags |= UQEN;
1619 if (aref != AREF_DIFF)
1620 conv_flags |= SD;
1621 if (aref == AREF_COMMON)
1622 conv_flags |= CMEN;
1623 /* if a unipolar range was selected */
1624 if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1625 conv_flags |= UB;
1626
1627 outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */
1628 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */
1629 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */
1630 outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1631
1632 chan = CR_CHAN(insn->chanspec);
1633 /* mask of unipolar/bipolar bit from range */
1634 range = CR_RANGE(insn->chanspec) & 0x3;
1635 chan_range = chan | (range << 8);
1636 spin_lock_irqsave(&dev->spinlock, irq_flags);
1637 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */
1638 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */
1639 outw(chan_range, dev->iobase + DAS1800_QRAM);
1640 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */
1641 outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */
1642
1643 for (n = 0; n < insn->n; n++) {
1644 /* trigger conversion */
1645 outb(0, dev->iobase + DAS1800_FIFO);
1646 for (i = 0; i < timeout; i++) {
1647 if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1648 break;
1649 }
1650 if (i == timeout) {
1651 comedi_error(dev, "timeout");
1652 n = -ETIME;
1653 goto exit;
1654 }
1655 dpnt = inw(dev->iobase + DAS1800_FIFO);
1656 /* shift data to offset binary for bipolar ranges */
1657 if ((conv_flags & UB) == 0)
1658 dpnt += 1 << (thisboard->resolution - 1);
1659 data[n] = dpnt;
1660 }
1661 exit:
1662 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1663
1664 return n;
1665 }
1666
1667 /* writes to an analog output channel */
1668 static int das1800_ao_winsn(struct comedi_device *dev,
1669 struct comedi_subdevice *s,
1670 struct comedi_insn *insn, unsigned int *data)
1671 {
1672 int chan = CR_CHAN(insn->chanspec);
1673 /* int range = CR_RANGE(insn->chanspec); */
1674 int update_chan = thisboard->ao_n_chan - 1;
1675 short output;
1676 unsigned long irq_flags;
1677
1678 /* card expects two's complement data */
1679 output = data[0] - (1 << (thisboard->resolution - 1));
1680 /* if the write is to the 'update' channel, we need to remember its value */
1681 if (chan == update_chan)
1682 devpriv->ao_update_bits = output;
1683 /* write to channel */
1684 spin_lock_irqsave(&dev->spinlock, irq_flags);
1685 outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */
1686 outw(output, dev->iobase + DAS1800_DAC);
1687 /* now we need to write to 'update' channel to update all dac channels */
1688 if (chan != update_chan) {
1689 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */
1690 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1691 }
1692 spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1693
1694 return 1;
1695 }
1696
1697 /* reads from digital input channels */
1698 static int das1800_di_rbits(struct comedi_device *dev,
1699 struct comedi_subdevice *s,
1700 struct comedi_insn *insn, unsigned int *data)
1701 {
1702
1703 data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1704 data[0] = 0;
1705
1706 return 2;
1707 }
1708
1709 /* writes to digital output channels */
1710 static int das1800_do_wbits(struct comedi_device *dev,
1711 struct comedi_subdevice *s,
1712 struct comedi_insn *insn, unsigned int *data)
1713 {
1714 unsigned int wbits;
1715
1716 /* only set bits that have been masked */
1717 data[0] &= (1 << s->n_chan) - 1;
1718 wbits = devpriv->do_bits;
1719 wbits &= ~data[0];
1720 wbits |= data[0] & data[1];
1721 devpriv->do_bits = wbits;
1722
1723 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1724
1725 data[1] = devpriv->do_bits;
1726
1727 return 2;
1728 }
1729
1730 /* loads counters with divisor1, divisor2 from private structure */
1731 static int das1800_set_frequency(struct comedi_device *dev)
1732 {
1733 int err = 0;
1734
1735 /* counter 1, mode 2 */
1736 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
1737 2))
1738 err++;
1739 /* counter 2, mode 2 */
1740 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
1741 2))
1742 err++;
1743 if (err)
1744 return -1;
1745
1746 return 0;
1747 }
1748
1749 /* converts requested conversion timing to timing compatible with
1750 * hardware, used only when card is in 'burst mode'
1751 */
1752 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
1753 {
1754 unsigned int micro_sec;
1755
1756 /* in burst mode, the maximum conversion time is 64 microseconds */
1757 if (convert_arg > 64000)
1758 convert_arg = 64000;
1759
1760 /* the conversion time must be an integral number of microseconds */
1761 switch (round_mode) {
1762 case TRIG_ROUND_NEAREST:
1763 default:
1764 micro_sec = (convert_arg + 500) / 1000;
1765 break;
1766 case TRIG_ROUND_DOWN:
1767 micro_sec = convert_arg / 1000;
1768 break;
1769 case TRIG_ROUND_UP:
1770 micro_sec = (convert_arg - 1) / 1000 + 1;
1771 break;
1772 }
1773
1774 /* return number of nanoseconds */
1775 return micro_sec * 1000;
1776 }
1777
1778 /* utility function that suggests a dma transfer size based on the conversion period 'ns' */
1779 static unsigned int suggest_transfer_size(struct comedi_cmd *cmd)
1780 {
1781 unsigned int size = DMA_BUF_SIZE;
1782 static const int sample_size = 2; /* size in bytes of one sample from board */
1783 unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */
1784 unsigned int max_size; /* maximum size we will allow for a transfer */
1785
1786 /* make dma buffer fill in 0.3 seconds for timed modes */
1787 switch (cmd->scan_begin_src) {
1788 case TRIG_FOLLOW: /* not in burst mode */
1789 if (cmd->convert_src == TRIG_TIMER)
1790 size = (fill_time / cmd->convert_arg) * sample_size;
1791 break;
1792 case TRIG_TIMER:
1793 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
1794 sample_size;
1795 break;
1796 default:
1797 size = DMA_BUF_SIZE;
1798 break;
1799 }
1800
1801 /* set a minimum and maximum size allowed */
1802 max_size = DMA_BUF_SIZE;
1803 /* if we are taking limited number of conversions, limit transfer size to that */
1804 if (cmd->stop_src == TRIG_COUNT &&
1805 cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
1806 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1807
1808 if (size > max_size)
1809 size = max_size;
1810 if (size < sample_size)
1811 size = sample_size;
1812
1813 return size;
1814 }
1815
1816 MODULE_AUTHOR("Comedi http://www.comedi.org");
1817 MODULE_DESCRIPTION("Comedi low-level driver");
1818 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree