projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / staging / comedi / drivers / ni_at_a2150.c
1 /*
2 comedi/drivers/ni_at_a2150.c
3 Driver for National Instruments AT-A2150 boards
4 Copyright (C) 2001, 2002 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: ni_at_a2150
27 Description: National Instruments AT-A2150
28 Author: Frank Mori Hess
29 Status: works
30 Devices: [National Instruments] AT-A2150C (at_a2150c), AT-2150S (at_a2150s)
31
32 If you want to ac couple the board's inputs, use AREF_OTHER.
33
34 Configuration options:
35 [0] - I/O port base address
36 [1] - IRQ (optional, required for timed conversions)
37 [2] - DMA (optional, required for timed conversions)
38
39 */
40 /*
41 Yet another driver for obsolete hardware brought to you by Frank Hess.
42 Testing and debugging help provided by Dave Andruczyk.
43
44 This driver supports the boards:
45
46 AT-A2150C
47 AT-A2150S
48
49 The only difference is their master clock frequencies.
50
51 Options:
52 [0] - base io address
53 [1] - irq
54 [2] - dma channel
55
56 References (from ftp://ftp.natinst.com/support/manuals):
57
58 320360.pdf AT-A2150 User Manual
59
60 TODO:
61
62 analog level triggering
63 TRIG_WAKE_EOS
64
65 */
66
67 #include <linux/interrupt.h>
68 #include <linux/slab.h>
69 #include "../comedidev.h"
70
71 #include <linux/ioport.h>
72 #include <asm/dma.h>
73
74 #include "8253.h"
75 #include "comedi_fc.h"
76
77 #define A2150_SIZE 28
78 #define A2150_DMA_BUFFER_SIZE 0xff00 /* size in bytes of dma buffer */
79
80 /* #define A2150_DEBUG enable debugging code */
81 #undef A2150_DEBUG /* disable debugging code */
82
83 /* Registers and bits */
84 #define CONFIG_REG 0x0
85 #define CHANNEL_BITS(x) ((x) & 0x7)
86 #define CHANNEL_MASK 0x7
87 #define CLOCK_SELECT_BITS(x) (((x) & 0x3) << 3)
88 #define CLOCK_DIVISOR_BITS(x) (((x) & 0x3) << 5)
89 #define CLOCK_MASK (0xf << 3)
90 #define ENABLE0_BIT 0x80 /* enable (don't internally ground) channels 0 and 1 */
91 #define ENABLE1_BIT 0x100 /* enable (don't internally ground) channels 2 and 3 */
92 #define AC0_BIT 0x200 /* ac couple channels 0,1 */
93 #define AC1_BIT 0x400 /* ac couple channels 2,3 */
94 #define APD_BIT 0x800 /* analog power down */
95 #define DPD_BIT 0x1000 /* digital power down */
96 #define TRIGGER_REG 0x2 /* trigger config register */
97 #define POST_TRIGGER_BITS 0x2
98 #define DELAY_TRIGGER_BITS 0x3
99 #define HW_TRIG_EN 0x10 /* enable hardware trigger */
100 #define FIFO_START_REG 0x6 /* software start aquistion trigger */
101 #define FIFO_RESET_REG 0x8 /* clears fifo + fifo flags */
102 #define FIFO_DATA_REG 0xa /* read data */
103 #define DMA_TC_CLEAR_REG 0xe /* clear dma terminal count interrupt */
104 #define STATUS_REG 0x12 /* read only */
105 #define FNE_BIT 0x1 /* fifo not empty */
106 #define OVFL_BIT 0x8 /* fifo overflow */
107 #define EDAQ_BIT 0x10 /* end of aquisition interrupt */
108 #define DCAL_BIT 0x20 /* offset calibration in progress */
109 #define INTR_BIT 0x40 /* interrupt has occured */
110 #define DMA_TC_BIT 0x80 /* dma terminal count interrupt has occured */
111 #define ID_BITS(x) (((x) >> 8) & 0x3)
112 #define IRQ_DMA_CNTRL_REG 0x12 /* write only */
113 #define DMA_CHAN_BITS(x) ((x) & 0x7) /* sets dma channel */
114 #define DMA_EN_BIT 0x8 /* enables dma */
115 #define IRQ_LVL_BITS(x) (((x) & 0xf) << 4) /* sets irq level */
116 #define FIFO_INTR_EN_BIT 0x100 /* enable fifo interrupts */
117 #define FIFO_INTR_FHF_BIT 0x200 /* interrupt fifo half full */
118 #define DMA_INTR_EN_BIT 0x800 /* enable interrupt on dma terminal count */
119 #define DMA_DEM_EN_BIT 0x1000 /* enables demand mode dma */
120 #define I8253_BASE_REG 0x14
121 #define I8253_MODE_REG 0x17
122 #define HW_COUNT_DISABLE 0x30 /* disable hardware counting of conversions */
123
124 struct a2150_board {
125 const char *name;
126 int clock[4]; /* master clock periods, in nanoseconds */
127 int num_clocks; /* number of available master clock speeds */
128 int ai_speed; /* maximum conversion rate in nanoseconds */
129 };
130
131 /* analog input range */
132 static const struct comedi_lrange range_a2150 = {
133 1,
134 {
135 RANGE(-2.828, 2.828),
136 }
137 };
138
139 /* enum must match board indices */
140 enum { a2150_c, a2150_s };
141 static const struct a2150_board a2150_boards[] = {
142 {
143 .name = "at-a2150c",
144 .clock = {31250, 22676, 20833, 19531},
145 .num_clocks = 4,
146 .ai_speed = 19531,
147 },
148 {
149 .name = "at-a2150s",
150 .clock = {62500, 50000, 41667, 0},
151 .num_clocks = 3,
152 .ai_speed = 41667,
153 },
154 };
155
156 /*
157 * Useful for shorthand access to the particular board structure
158 */
159 #define thisboard ((const struct a2150_board *)dev->board_ptr)
160
161 struct a2150_private {
162
163 volatile unsigned int count; /* number of data points left to be taken */
164 unsigned int dma; /* dma channel */
165 s16 *dma_buffer; /* dma buffer */
166 unsigned int dma_transfer_size; /* size in bytes of dma transfers */
167 int irq_dma_bits; /* irq/dma register bits */
168 int config_bits; /* config register bits */
169 };
170
171 #define devpriv ((struct a2150_private *)dev->private)
172
173 static int a2150_attach(struct comedi_device *dev, struct comedi_devconfig *it);
174 static int a2150_detach(struct comedi_device *dev);
175 static int a2150_cancel(struct comedi_device *dev, struct comedi_subdevice *s);
176
177 static struct comedi_driver driver_a2150 = {
178 .driver_name = "ni_at_a2150",
179 .module = THIS_MODULE,
180 .attach = a2150_attach,
181 .detach = a2150_detach,
182 };
183
184 static irqreturn_t a2150_interrupt(int irq, void *d);
185 static int a2150_ai_cmdtest(struct comedi_device *dev,
186 struct comedi_subdevice *s, struct comedi_cmd *cmd);
187 static int a2150_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s);
188 static int a2150_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
189 struct comedi_insn *insn, unsigned int *data);
190 static int a2150_get_timing(struct comedi_device *dev, unsigned int *period,
191 int flags);
192 static int a2150_probe(struct comedi_device *dev);
193 static int a2150_set_chanlist(struct comedi_device *dev,
194 unsigned int start_channel,
195 unsigned int num_channels);
196 /*
197 * A convenient macro that defines init_module() and cleanup_module(),
198 * as necessary.
199 */
200 COMEDI_INITCLEANUP(driver_a2150);
201
202 #ifdef A2150_DEBUG
203
204 static void ni_dump_regs(struct comedi_device *dev)
205 {
206 printk("config bits 0x%x\n", devpriv->config_bits);
207 printk("irq dma bits 0x%x\n", devpriv->irq_dma_bits);
208 printk("status bits 0x%x\n", inw(dev->iobase + STATUS_REG));
209 }
210
211 #endif
212
213 /* interrupt service routine */
214 static irqreturn_t a2150_interrupt(int irq, void *d)
215 {
216 int i;
217 int status;
218 unsigned long flags;
219 struct comedi_device *dev = d;
220 struct comedi_subdevice *s = dev->read_subdev;
221 struct comedi_async *async;
222 struct comedi_cmd *cmd;
223 unsigned int max_points, num_points, residue, leftover;
224 short dpnt;
225 static const int sample_size = sizeof(devpriv->dma_buffer[0]);
226
227 if (dev->attached == 0) {
228 comedi_error(dev, "premature interrupt");
229 return IRQ_HANDLED;
230 }
231 /* initialize async here to make sure s is not NULL */
232 async = s->async;
233 async->events = 0;
234 cmd = &async->cmd;
235
236 status = inw(dev->iobase + STATUS_REG);
237
238 if ((status & INTR_BIT) == 0) {
239 comedi_error(dev, "spurious interrupt");
240 return IRQ_NONE;
241 }
242
243 if (status & OVFL_BIT) {
244 comedi_error(dev, "fifo overflow");
245 a2150_cancel(dev, s);
246 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
247 }
248
249 if ((status & DMA_TC_BIT) == 0) {
250 comedi_error(dev, "caught non-dma interrupt? Aborting.");
251 a2150_cancel(dev, s);
252 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
253 comedi_event(dev, s);
254 return IRQ_HANDLED;
255 }
256
257 flags = claim_dma_lock();
258 disable_dma(devpriv->dma);
259 /* clear flip-flop to make sure 2-byte registers for
260 * count and address get set correctly */
261 clear_dma_ff(devpriv->dma);
262
263 /* figure out how many points to read */
264 max_points = devpriv->dma_transfer_size / sample_size;
265 /* residue is the number of points left to be done on the dma
266 * transfer. It should always be zero at this point unless
267 * the stop_src is set to external triggering.
268 */
269 residue = get_dma_residue(devpriv->dma) / sample_size;
270 num_points = max_points - residue;
271 if (devpriv->count < num_points && cmd->stop_src == TRIG_COUNT)
272 num_points = devpriv->count;
273
274 /* figure out how many points will be stored next time */
275 leftover = 0;
276 if (cmd->stop_src == TRIG_NONE) {
277 leftover = devpriv->dma_transfer_size / sample_size;
278 } else if (devpriv->count > max_points) {
279 leftover = devpriv->count - max_points;
280 if (leftover > max_points)
281 leftover = max_points;
282 }
283 /* there should only be a residue if collection was stopped by having
284 * the stop_src set to an external trigger, in which case there
285 * will be no more data
286 */
287 if (residue)
288 leftover = 0;
289
290 for (i = 0; i < num_points; i++) {
291 /* write data point to comedi buffer */
292 dpnt = devpriv->dma_buffer[i];
293 /* convert from 2's complement to unsigned coding */
294 dpnt ^= 0x8000;
295 cfc_write_to_buffer(s, dpnt);
296 if (cmd->stop_src == TRIG_COUNT) {
297 if (--devpriv->count == 0) { /* end of acquisition */
298 a2150_cancel(dev, s);
299 async->events |= COMEDI_CB_EOA;
300 break;
301 }
302 }
303 }
304 /* re-enable dma */
305 if (leftover) {
306 set_dma_addr(devpriv->dma, virt_to_bus(devpriv->dma_buffer));
307 set_dma_count(devpriv->dma, leftover * sample_size);
308 enable_dma(devpriv->dma);
309 }
310 release_dma_lock(flags);
311
312 async->events |= COMEDI_CB_BLOCK;
313
314 comedi_event(dev, s);
315
316 /* clear interrupt */
317 outw(0x00, dev->iobase + DMA_TC_CLEAR_REG);
318
319 return IRQ_HANDLED;
320 }
321
322 /* probes board type, returns offset */
323 static int a2150_probe(struct comedi_device *dev)
324 {
325 int status = inw(dev->iobase + STATUS_REG);
326 return ID_BITS(status);
327 }
328
329 static int a2150_attach(struct comedi_device *dev, struct comedi_devconfig *it)
330 {
331 struct comedi_subdevice *s;
332 unsigned long iobase = it->options[0];
333 unsigned int irq = it->options[1];
334 unsigned int dma = it->options[2];
335 static const int timeout = 2000;
336 int i;
337
338 printk("comedi%d: %s: io 0x%lx", dev->minor, driver_a2150.driver_name,
339 iobase);
340 if (irq) {
341 printk(", irq %u", irq);
342 } else {
343 printk(", no irq");
344 }
345 if (dma) {
346 printk(", dma %u", dma);
347 } else {
348 printk(", no dma");
349 }
350 printk("\n");
351
352 /* allocate and initialize dev->private */
353 if (alloc_private(dev, sizeof(struct a2150_private)) < 0)
354 return -ENOMEM;
355
356 if (iobase == 0) {
357 printk(" io base address required\n");
358 return -EINVAL;
359 }
360
361 /* check if io addresses are available */
362 if (!request_region(iobase, A2150_SIZE, driver_a2150.driver_name)) {
363 printk(" I/O port conflict\n");
364 return -EIO;
365 }
366 dev->iobase = iobase;
367
368 /* grab our IRQ */
369 if (irq) {
370 /* check that irq is supported */
371 if (irq < 3 || irq == 8 || irq == 13 || irq > 15) {
372 printk(" invalid irq line %u\n", irq);
373 return -EINVAL;
374 }
375 if (request_irq(irq, a2150_interrupt, 0,
376 driver_a2150.driver_name, dev)) {
377 printk("unable to allocate irq %u\n", irq);
378 return -EINVAL;
379 }
380 devpriv->irq_dma_bits |= IRQ_LVL_BITS(irq);
381 dev->irq = irq;
382 }
383 /* initialize dma */
384 if (dma) {
385 if (dma == 4 || dma > 7) {
386 printk(" invalid dma channel %u\n", dma);
387 return -EINVAL;
388 }
389 if (request_dma(dma, driver_a2150.driver_name)) {
390 printk(" failed to allocate dma channel %u\n", dma);
391 return -EINVAL;
392 }
393 devpriv->dma = dma;
394 devpriv->dma_buffer =
395 kmalloc(A2150_DMA_BUFFER_SIZE, GFP_KERNEL | GFP_DMA);
396 if (devpriv->dma_buffer == NULL)
397 return -ENOMEM;
398
399 disable_dma(dma);
400 set_dma_mode(dma, DMA_MODE_READ);
401
402 devpriv->irq_dma_bits |= DMA_CHAN_BITS(dma);
403 }
404
405 dev->board_ptr = a2150_boards + a2150_probe(dev);
406 dev->board_name = thisboard->name;
407
408 if (alloc_subdevices(dev, 1) < 0)
409 return -ENOMEM;
410
411 /* analog input subdevice */
412 s = dev->subdevices + 0;
413 dev->read_subdev = s;
414 s->type = COMEDI_SUBD_AI;
415 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_OTHER | SDF_CMD_READ;
416 s->n_chan = 4;
417 s->len_chanlist = 4;
418 s->maxdata = 0xffff;
419 s->range_table = &range_a2150;
420 s->do_cmd = a2150_ai_cmd;
421 s->do_cmdtest = a2150_ai_cmdtest;
422 s->insn_read = a2150_ai_rinsn;
423 s->cancel = a2150_cancel;
424
425 /* need to do this for software counting of completed conversions, to
426 * prevent hardware count from stopping aquisition */
427 outw(HW_COUNT_DISABLE, dev->iobase + I8253_MODE_REG);
428
429 /* set card's irq and dma levels */
430 outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG);
431
432 /* reset and sync adc clock circuitry */
433 outw_p(DPD_BIT | APD_BIT, dev->iobase + CONFIG_REG);
434 outw_p(DPD_BIT, dev->iobase + CONFIG_REG);
435 /* initialize configuration register */
436 devpriv->config_bits = 0;
437 outw(devpriv->config_bits, dev->iobase + CONFIG_REG);
438 /* wait until offset calibration is done, then enable analog inputs */
439 for (i = 0; i < timeout; i++) {
440 if ((DCAL_BIT & inw(dev->iobase + STATUS_REG)) == 0)
441 break;
442 udelay(1000);
443 }
444 if (i == timeout) {
445 printk
446 (" timed out waiting for offset calibration to complete\n");
447 return -ETIME;
448 }
449 devpriv->config_bits |= ENABLE0_BIT | ENABLE1_BIT;
450 outw(devpriv->config_bits, dev->iobase + CONFIG_REG);
451
452 return 0;
453 };
454
455 static int a2150_detach(struct comedi_device *dev)
456 {
457 printk("comedi%d: %s: remove\n", dev->minor, driver_a2150.driver_name);
458
459 /* only free stuff if it has been allocated by _attach */
460 if (dev->iobase) {
461 /* put board in power-down mode */
462 outw(APD_BIT | DPD_BIT, dev->iobase + CONFIG_REG);
463 release_region(dev->iobase, A2150_SIZE);
464 }
465
466 if (dev->irq)
467 free_irq(dev->irq, dev);
468 if (devpriv) {
469 if (devpriv->dma)
470 free_dma(devpriv->dma);
471 if (devpriv->dma_buffer)
472 kfree(devpriv->dma_buffer);
473 }
474
475 return 0;
476 };
477
478 static int a2150_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
479 {
480 /* disable dma on card */
481 devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT;
482 outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG);
483
484 /* disable computer's dma */
485 disable_dma(devpriv->dma);
486
487 /* clear fifo and reset triggering circuitry */
488 outw(0, dev->iobase + FIFO_RESET_REG);
489
490 return 0;
491 }
492
493 static int a2150_ai_cmdtest(struct comedi_device *dev,
494 struct comedi_subdevice *s, struct comedi_cmd *cmd)
495 {
496 int err = 0;
497 int tmp;
498 int startChan;
499 int i;
500
501 /* step 1: make sure trigger sources are trivially valid */
502
503 tmp = cmd->start_src;
504 cmd->start_src &= TRIG_NOW | TRIG_EXT;
505 if (!cmd->start_src || tmp != cmd->start_src)
506 err++;
507
508 tmp = cmd->scan_begin_src;
509 cmd->scan_begin_src &= TRIG_TIMER;
510 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
511 err++;
512
513 tmp = cmd->convert_src;
514 cmd->convert_src &= TRIG_NOW;
515 if (!cmd->convert_src || tmp != cmd->convert_src)
516 err++;
517
518 tmp = cmd->scan_end_src;
519 cmd->scan_end_src &= TRIG_COUNT;
520 if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
521 err++;
522
523 tmp = cmd->stop_src;
524 cmd->stop_src &= TRIG_COUNT | TRIG_NONE;
525 if (!cmd->stop_src || tmp != cmd->stop_src)
526 err++;
527
528 if (err)
529 return 1;
530
531 /* step 2: make sure trigger sources are unique and mutually compatible */
532
533 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
534 err++;
535 if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE)
536 err++;
537
538 if (err)
539 return 2;
540
541 /* step 3: make sure arguments are trivially compatible */
542
543 if (cmd->start_arg != 0) {
544 cmd->start_arg = 0;
545 err++;
546 }
547 if (cmd->convert_src == TRIG_TIMER) {
548 if (cmd->convert_arg < thisboard->ai_speed) {
549 cmd->convert_arg = thisboard->ai_speed;
550 err++;
551 }
552 }
553 if (!cmd->chanlist_len) {
554 cmd->chanlist_len = 1;
555 err++;
556 }
557 if (cmd->scan_end_arg != cmd->chanlist_len) {
558 cmd->scan_end_arg = cmd->chanlist_len;
559 err++;
560 }
561 if (cmd->stop_src == TRIG_COUNT) {
562 if (!cmd->stop_arg) {
563 cmd->stop_arg = 1;
564 err++;
565 }
566 } else { /* TRIG_NONE */
567 if (cmd->stop_arg != 0) {
568 cmd->stop_arg = 0;
569 err++;
570 }
571 }
572
573 if (err)
574 return 3;
575
576 /* step 4: fix up any arguments */
577
578 if (cmd->scan_begin_src == TRIG_TIMER) {
579 tmp = cmd->scan_begin_arg;
580 a2150_get_timing(dev, &cmd->scan_begin_arg, cmd->flags);
581 if (tmp != cmd->scan_begin_arg)
582 err++;
583 }
584
585 if (err)
586 return 4;
587
588 /* check channel/gain list against card's limitations */
589 if (cmd->chanlist) {
590 startChan = CR_CHAN(cmd->chanlist[0]);
591 for (i = 1; i < cmd->chanlist_len; i++) {
592 if (CR_CHAN(cmd->chanlist[i]) != (startChan + i)) {
593 comedi_error(dev,
594 "entries in chanlist must be consecutive channels, counting upwards\n");
595 err++;
596 }
597 }
598 if (cmd->chanlist_len == 2 && CR_CHAN(cmd->chanlist[0]) == 1) {
599 comedi_error(dev,
600 "length 2 chanlist must be channels 0,1 or channels 2,3");
601 err++;
602 }
603 if (cmd->chanlist_len == 3) {
604 comedi_error(dev,
605 "chanlist must have 1,2 or 4 channels");
606 err++;
607 }
608 if (CR_AREF(cmd->chanlist[0]) != CR_AREF(cmd->chanlist[1]) ||
609 CR_AREF(cmd->chanlist[2]) != CR_AREF(cmd->chanlist[3])) {
610 comedi_error(dev,
611 "channels 0/1 and 2/3 must have the same analog reference");
612 err++;
613 }
614 }
615
616 if (err)
617 return 5;
618
619 return 0;
620 }
621
622 static int a2150_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s)
623 {
624 struct comedi_async *async = s->async;
625 struct comedi_cmd *cmd = &async->cmd;
626 unsigned long lock_flags;
627 unsigned int old_config_bits = devpriv->config_bits;
628 unsigned int trigger_bits;
629
630 if (!dev->irq || !devpriv->dma) {
631 comedi_error(dev,
632 " irq and dma required, cannot do hardware conversions");
633 return -1;
634 }
635 if (cmd->flags & TRIG_RT) {
636 comedi_error(dev,
637 " dma incompatible with hard real-time interrupt (TRIG_RT), aborting");
638 return -1;
639 }
640 /* clear fifo and reset triggering circuitry */
641 outw(0, dev->iobase + FIFO_RESET_REG);
642
643 /* setup chanlist */
644 if (a2150_set_chanlist(dev, CR_CHAN(cmd->chanlist[0]),
645 cmd->chanlist_len) < 0)
646 return -1;
647
648 /* setup ac/dc coupling */
649 if (CR_AREF(cmd->chanlist[0]) == AREF_OTHER)
650 devpriv->config_bits |= AC0_BIT;
651 else
652 devpriv->config_bits &= ~AC0_BIT;
653 if (CR_AREF(cmd->chanlist[2]) == AREF_OTHER)
654 devpriv->config_bits |= AC1_BIT;
655 else
656 devpriv->config_bits &= ~AC1_BIT;
657
658 /* setup timing */
659 a2150_get_timing(dev, &cmd->scan_begin_arg, cmd->flags);
660
661 /* send timing, channel, config bits */
662 outw(devpriv->config_bits, dev->iobase + CONFIG_REG);
663
664 /* initialize number of samples remaining */
665 devpriv->count = cmd->stop_arg * cmd->chanlist_len;
666
667 /* enable computer's dma */
668 lock_flags = claim_dma_lock();
669 disable_dma(devpriv->dma);
670 /* clear flip-flop to make sure 2-byte registers for
671 * count and address get set correctly */
672 clear_dma_ff(devpriv->dma);
673 set_dma_addr(devpriv->dma, virt_to_bus(devpriv->dma_buffer));
674 /* set size of transfer to fill in 1/3 second */
675 #define ONE_THIRD_SECOND 333333333
676 devpriv->dma_transfer_size =
677 sizeof(devpriv->dma_buffer[0]) * cmd->chanlist_len *
678 ONE_THIRD_SECOND / cmd->scan_begin_arg;
679 if (devpriv->dma_transfer_size > A2150_DMA_BUFFER_SIZE)
680 devpriv->dma_transfer_size = A2150_DMA_BUFFER_SIZE;
681 if (devpriv->dma_transfer_size < sizeof(devpriv->dma_buffer[0]))
682 devpriv->dma_transfer_size = sizeof(devpriv->dma_buffer[0]);
683 devpriv->dma_transfer_size -=
684 devpriv->dma_transfer_size % sizeof(devpriv->dma_buffer[0]);
685 set_dma_count(devpriv->dma, devpriv->dma_transfer_size);
686 enable_dma(devpriv->dma);
687 release_dma_lock(lock_flags);
688
689 /* clear dma interrupt before enabling it, to try and get rid of that
690 * one spurious interrupt that has been happening */
691 outw(0x00, dev->iobase + DMA_TC_CLEAR_REG);
692
693 /* enable dma on card */
694 devpriv->irq_dma_bits |= DMA_INTR_EN_BIT | DMA_EN_BIT;
695 outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG);
696
697 /* may need to wait 72 sampling periods if timing was changed */
698 i8254_load(dev->iobase + I8253_BASE_REG, 0, 2, 72, 0);
699
700 /* setup start triggering */
701 trigger_bits = 0;
702 /* decide if we need to wait 72 periods for valid data */
703 if (cmd->start_src == TRIG_NOW &&
704 (old_config_bits & CLOCK_MASK) !=
705 (devpriv->config_bits & CLOCK_MASK)) {
706 /* set trigger source to delay trigger */
707 trigger_bits |= DELAY_TRIGGER_BITS;
708 } else {
709 /* otherwise no delay */
710 trigger_bits |= POST_TRIGGER_BITS;
711 }
712 /* enable external hardware trigger */
713 if (cmd->start_src == TRIG_EXT) {
714 trigger_bits |= HW_TRIG_EN;
715 } else if (cmd->start_src == TRIG_OTHER) {
716 /* XXX add support for level/slope start trigger using TRIG_OTHER */
717 comedi_error(dev, "you shouldn't see this?");
718 }
719 /* send trigger config bits */
720 outw(trigger_bits, dev->iobase + TRIGGER_REG);
721
722 /* start aquisition for soft trigger */
723 if (cmd->start_src == TRIG_NOW) {
724 outw(0, dev->iobase + FIFO_START_REG);
725 }
726 #ifdef A2150_DEBUG
727 ni_dump_regs(dev);
728 #endif
729
730 return 0;
731 }
732
733 static int a2150_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s,
734 struct comedi_insn *insn, unsigned int *data)
735 {
736 unsigned int i, n;
737 static const int timeout = 100000;
738 static const int filter_delay = 36;
739
740 /* clear fifo and reset triggering circuitry */
741 outw(0, dev->iobase + FIFO_RESET_REG);
742
743 /* setup chanlist */
744 if (a2150_set_chanlist(dev, CR_CHAN(insn->chanspec), 1) < 0)
745 return -1;
746
747 /* set dc coupling */
748 devpriv->config_bits &= ~AC0_BIT;
749 devpriv->config_bits &= ~AC1_BIT;
750
751 /* send timing, channel, config bits */
752 outw(devpriv->config_bits, dev->iobase + CONFIG_REG);
753
754 /* disable dma on card */
755 devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT;
756 outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG);
757
758 /* setup start triggering */
759 outw(0, dev->iobase + TRIGGER_REG);
760
761 /* start aquisition for soft trigger */
762 outw(0, dev->iobase + FIFO_START_REG);
763
764 /* there is a 35.6 sample delay for data to get through the antialias filter */
765 for (n = 0; n < filter_delay; n++) {
766 for (i = 0; i < timeout; i++) {
767 if (inw(dev->iobase + STATUS_REG) & FNE_BIT)
768 break;
769 udelay(1);
770 }
771 if (i == timeout) {
772 comedi_error(dev, "timeout");
773 return -ETIME;
774 }
775 inw(dev->iobase + FIFO_DATA_REG);
776 }
777
778 /* read data */
779 for (n = 0; n < insn->n; n++) {
780 for (i = 0; i < timeout; i++) {
781 if (inw(dev->iobase + STATUS_REG) & FNE_BIT)
782 break;
783 udelay(1);
784 }
785 if (i == timeout) {
786 comedi_error(dev, "timeout");
787 return -ETIME;
788 }
789 #ifdef A2150_DEBUG
790 ni_dump_regs(dev);
791 #endif
792 data[n] = inw(dev->iobase + FIFO_DATA_REG);
793 #ifdef A2150_DEBUG
794 printk(" data is %i\n", data[n]);
795 #endif
796 data[n] ^= 0x8000;
797 }
798
799 /* clear fifo and reset triggering circuitry */
800 outw(0, dev->iobase + FIFO_RESET_REG);
801
802 return n;
803 }
804
805 /* sets bits in devpriv->clock_bits to nearest approximation of requested period,
806 * adjusts requested period to actual timing. */
807 static int a2150_get_timing(struct comedi_device *dev, unsigned int *period,
808 int flags)
809 {
810 int lub, glb, temp;
811 int lub_divisor_shift, lub_index, glb_divisor_shift, glb_index;
812 int i, j;
813
814 /* initialize greatest lower and least upper bounds */
815 lub_divisor_shift = 3;
816 lub_index = 0;
817 lub = thisboard->clock[lub_index] * (1 << lub_divisor_shift);
818 glb_divisor_shift = 0;
819 glb_index = thisboard->num_clocks - 1;
820 glb = thisboard->clock[glb_index] * (1 << glb_divisor_shift);
821
822 /* make sure period is in available range */
823 if (*period < glb)
824 *period = glb;
825 if (*period > lub)
826 *period = lub;
827
828 /* we can multiply period by 1, 2, 4, or 8, using (1 << i) */
829 for (i = 0; i < 4; i++) {
830 /* there are a maximum of 4 master clocks */
831 for (j = 0; j < thisboard->num_clocks; j++) {
832 /* temp is the period in nanosec we are evaluating */
833 temp = thisboard->clock[j] * (1 << i);
834 /* if it is the best match yet */
835 if (temp < lub && temp >= *period) {
836 lub_divisor_shift = i;
837 lub_index = j;
838 lub = temp;
839 }
840 if (temp > glb && temp <= *period) {
841 glb_divisor_shift = i;
842 glb_index = j;
843 glb = temp;
844 }
845 }
846 }
847 flags &= TRIG_ROUND_MASK;
848 switch (flags) {
849 case TRIG_ROUND_NEAREST:
850 default:
851 /* if least upper bound is better approximation */
852 if (lub - *period < *period - glb) {
853 *period = lub;
854 } else {
855 *period = glb;
856 }
857 break;
858 case TRIG_ROUND_UP:
859 *period = lub;
860 break;
861 case TRIG_ROUND_DOWN:
862 *period = glb;
863 break;
864 }
865
866 /* set clock bits for config register appropriately */
867 devpriv->config_bits &= ~CLOCK_MASK;
868 if (*period == lub) {
869 devpriv->config_bits |=
870 CLOCK_SELECT_BITS(lub_index) |
871 CLOCK_DIVISOR_BITS(lub_divisor_shift);
872 } else {
873 devpriv->config_bits |=
874 CLOCK_SELECT_BITS(glb_index) |
875 CLOCK_DIVISOR_BITS(glb_divisor_shift);
876 }
877
878 return 0;
879 }
880
881 static int a2150_set_chanlist(struct comedi_device *dev,
882 unsigned int start_channel,
883 unsigned int num_channels)
884 {
885 if (start_channel + num_channels > 4)
886 return -1;
887
888 devpriv->config_bits &= ~CHANNEL_MASK;
889
890 switch (num_channels) {
891 case 1:
892 devpriv->config_bits |= CHANNEL_BITS(0x4 | start_channel);
893 break;
894 case 2:
895 if (start_channel == 0) {
896 devpriv->config_bits |= CHANNEL_BITS(0x2);
897 } else if (start_channel == 2) {
898 devpriv->config_bits |= CHANNEL_BITS(0x3);
899 } else {
900 return -1;
901 }
902 break;
903 case 4:
904 devpriv->config_bits |= CHANNEL_BITS(0x1);
905 break;
906 default:
907 return -1;
908 break;
909 }
910
911 return 0;
912 }
kernel source for telekom puls (alcatel/mediatek)