ni_at_a2150.c revision 25985edcedea6396277003854657b5f3cb31a628
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/* 26Driver: ni_at_a2150 27Description: National Instruments AT-A2150 28Author: Frank Mori Hess 29Status: works 30Devices: [National Instruments] AT-A2150C (at_a2150c), AT-2150S (at_a2150s) 31 32If you want to ac couple the board's inputs, use AREF_OTHER. 33 34Configuration 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/* 41Yet another driver for obsolete hardware brought to you by Frank Hess. 42Testing and debugging help provided by Dave Andruczyk. 43 44This driver supports the boards: 45 46AT-A2150C 47AT-A2150S 48 49The only difference is their master clock frequencies. 50 51Options: 52 [0] - base io address 53 [1] - irq 54 [2] - dma channel 55 56References (from ftp://ftp.natinst.com/support/manuals): 57 58 320360.pdf AT-A2150 User Manual 59 60TODO: 61 62analog level triggering 63TRIG_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 acquisition interrupt */ 108#define DCAL_BIT 0x20 /* offset calibration in progress */ 109#define INTR_BIT 0x40 /* interrupt has occurred */ 110#define DMA_TC_BIT 0x80 /* dma terminal count interrupt has occurred */ 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 124struct 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 */ 132static const struct comedi_lrange range_a2150 = { 133 1, 134 { 135 RANGE(-2.828, 2.828), 136 } 137}; 138 139/* enum must match board indices */ 140enum { a2150_c, a2150_s }; 141static 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 161struct 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 173static int a2150_attach(struct comedi_device *dev, struct comedi_devconfig *it); 174static int a2150_detach(struct comedi_device *dev); 175static int a2150_cancel(struct comedi_device *dev, struct comedi_subdevice *s); 176 177static 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 184static irqreturn_t a2150_interrupt(int irq, void *d); 185static int a2150_ai_cmdtest(struct comedi_device *dev, 186 struct comedi_subdevice *s, struct comedi_cmd *cmd); 187static int a2150_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s); 188static int a2150_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s, 189 struct comedi_insn *insn, unsigned int *data); 190static int a2150_get_timing(struct comedi_device *dev, unsigned int *period, 191 int flags); 192static int a2150_probe(struct comedi_device *dev); 193static 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 */ 200static int __init driver_a2150_init_module(void) 201{ 202 return comedi_driver_register(&driver_a2150); 203} 204 205static void __exit driver_a2150_cleanup_module(void) 206{ 207 comedi_driver_unregister(&driver_a2150); 208} 209 210module_init(driver_a2150_init_module); 211module_exit(driver_a2150_cleanup_module); 212 213#ifdef A2150_DEBUG 214 215static void ni_dump_regs(struct comedi_device *dev) 216{ 217 printk("config bits 0x%x\n", devpriv->config_bits); 218 printk("irq dma bits 0x%x\n", devpriv->irq_dma_bits); 219 printk("status bits 0x%x\n", inw(dev->iobase + STATUS_REG)); 220} 221 222#endif 223 224/* interrupt service routine */ 225static irqreturn_t a2150_interrupt(int irq, void *d) 226{ 227 int i; 228 int status; 229 unsigned long flags; 230 struct comedi_device *dev = d; 231 struct comedi_subdevice *s = dev->read_subdev; 232 struct comedi_async *async; 233 struct comedi_cmd *cmd; 234 unsigned int max_points, num_points, residue, leftover; 235 short dpnt; 236 static const int sample_size = sizeof(devpriv->dma_buffer[0]); 237 238 if (dev->attached == 0) { 239 comedi_error(dev, "premature interrupt"); 240 return IRQ_HANDLED; 241 } 242 /* initialize async here to make sure s is not NULL */ 243 async = s->async; 244 async->events = 0; 245 cmd = &async->cmd; 246 247 status = inw(dev->iobase + STATUS_REG); 248 249 if ((status & INTR_BIT) == 0) { 250 comedi_error(dev, "spurious interrupt"); 251 return IRQ_NONE; 252 } 253 254 if (status & OVFL_BIT) { 255 comedi_error(dev, "fifo overflow"); 256 a2150_cancel(dev, s); 257 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA; 258 } 259 260 if ((status & DMA_TC_BIT) == 0) { 261 comedi_error(dev, "caught non-dma interrupt? Aborting."); 262 a2150_cancel(dev, s); 263 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA; 264 comedi_event(dev, s); 265 return IRQ_HANDLED; 266 } 267 268 flags = claim_dma_lock(); 269 disable_dma(devpriv->dma); 270 /* clear flip-flop to make sure 2-byte registers for 271 * count and address get set correctly */ 272 clear_dma_ff(devpriv->dma); 273 274 /* figure out how many points to read */ 275 max_points = devpriv->dma_transfer_size / sample_size; 276 /* residue is the number of points left to be done on the dma 277 * transfer. It should always be zero at this point unless 278 * the stop_src is set to external triggering. 279 */ 280 residue = get_dma_residue(devpriv->dma) / sample_size; 281 num_points = max_points - residue; 282 if (devpriv->count < num_points && cmd->stop_src == TRIG_COUNT) 283 num_points = devpriv->count; 284 285 /* figure out how many points will be stored next time */ 286 leftover = 0; 287 if (cmd->stop_src == TRIG_NONE) { 288 leftover = devpriv->dma_transfer_size / sample_size; 289 } else if (devpriv->count > max_points) { 290 leftover = devpriv->count - max_points; 291 if (leftover > max_points) 292 leftover = max_points; 293 } 294 /* there should only be a residue if collection was stopped by having 295 * the stop_src set to an external trigger, in which case there 296 * will be no more data 297 */ 298 if (residue) 299 leftover = 0; 300 301 for (i = 0; i < num_points; i++) { 302 /* write data point to comedi buffer */ 303 dpnt = devpriv->dma_buffer[i]; 304 /* convert from 2's complement to unsigned coding */ 305 dpnt ^= 0x8000; 306 cfc_write_to_buffer(s, dpnt); 307 if (cmd->stop_src == TRIG_COUNT) { 308 if (--devpriv->count == 0) { /* end of acquisition */ 309 a2150_cancel(dev, s); 310 async->events |= COMEDI_CB_EOA; 311 break; 312 } 313 } 314 } 315 /* re-enable dma */ 316 if (leftover) { 317 set_dma_addr(devpriv->dma, virt_to_bus(devpriv->dma_buffer)); 318 set_dma_count(devpriv->dma, leftover * sample_size); 319 enable_dma(devpriv->dma); 320 } 321 release_dma_lock(flags); 322 323 async->events |= COMEDI_CB_BLOCK; 324 325 comedi_event(dev, s); 326 327 /* clear interrupt */ 328 outw(0x00, dev->iobase + DMA_TC_CLEAR_REG); 329 330 return IRQ_HANDLED; 331} 332 333/* probes board type, returns offset */ 334static int a2150_probe(struct comedi_device *dev) 335{ 336 int status = inw(dev->iobase + STATUS_REG); 337 return ID_BITS(status); 338} 339 340static int a2150_attach(struct comedi_device *dev, struct comedi_devconfig *it) 341{ 342 struct comedi_subdevice *s; 343 unsigned long iobase = it->options[0]; 344 unsigned int irq = it->options[1]; 345 unsigned int dma = it->options[2]; 346 static const int timeout = 2000; 347 int i; 348 349 printk("comedi%d: %s: io 0x%lx", dev->minor, driver_a2150.driver_name, 350 iobase); 351 if (irq) { 352 printk(", irq %u", irq); 353 } else { 354 printk(", no irq"); 355 } 356 if (dma) { 357 printk(", dma %u", dma); 358 } else { 359 printk(", no dma"); 360 } 361 printk("\n"); 362 363 /* allocate and initialize dev->private */ 364 if (alloc_private(dev, sizeof(struct a2150_private)) < 0) 365 return -ENOMEM; 366 367 if (iobase == 0) { 368 printk(" io base address required\n"); 369 return -EINVAL; 370 } 371 372 /* check if io addresses are available */ 373 if (!request_region(iobase, A2150_SIZE, driver_a2150.driver_name)) { 374 printk(" I/O port conflict\n"); 375 return -EIO; 376 } 377 dev->iobase = iobase; 378 379 /* grab our IRQ */ 380 if (irq) { 381 /* check that irq is supported */ 382 if (irq < 3 || irq == 8 || irq == 13 || irq > 15) { 383 printk(" invalid irq line %u\n", irq); 384 return -EINVAL; 385 } 386 if (request_irq(irq, a2150_interrupt, 0, 387 driver_a2150.driver_name, dev)) { 388 printk("unable to allocate irq %u\n", irq); 389 return -EINVAL; 390 } 391 devpriv->irq_dma_bits |= IRQ_LVL_BITS(irq); 392 dev->irq = irq; 393 } 394 /* initialize dma */ 395 if (dma) { 396 if (dma == 4 || dma > 7) { 397 printk(" invalid dma channel %u\n", dma); 398 return -EINVAL; 399 } 400 if (request_dma(dma, driver_a2150.driver_name)) { 401 printk(" failed to allocate dma channel %u\n", dma); 402 return -EINVAL; 403 } 404 devpriv->dma = dma; 405 devpriv->dma_buffer = 406 kmalloc(A2150_DMA_BUFFER_SIZE, GFP_KERNEL | GFP_DMA); 407 if (devpriv->dma_buffer == NULL) 408 return -ENOMEM; 409 410 disable_dma(dma); 411 set_dma_mode(dma, DMA_MODE_READ); 412 413 devpriv->irq_dma_bits |= DMA_CHAN_BITS(dma); 414 } 415 416 dev->board_ptr = a2150_boards + a2150_probe(dev); 417 dev->board_name = thisboard->name; 418 419 if (alloc_subdevices(dev, 1) < 0) 420 return -ENOMEM; 421 422 /* analog input subdevice */ 423 s = dev->subdevices + 0; 424 dev->read_subdev = s; 425 s->type = COMEDI_SUBD_AI; 426 s->subdev_flags = SDF_READABLE | SDF_GROUND | SDF_OTHER | SDF_CMD_READ; 427 s->n_chan = 4; 428 s->len_chanlist = 4; 429 s->maxdata = 0xffff; 430 s->range_table = &range_a2150; 431 s->do_cmd = a2150_ai_cmd; 432 s->do_cmdtest = a2150_ai_cmdtest; 433 s->insn_read = a2150_ai_rinsn; 434 s->cancel = a2150_cancel; 435 436 /* need to do this for software counting of completed conversions, to 437 * prevent hardware count from stopping acquisition */ 438 outw(HW_COUNT_DISABLE, dev->iobase + I8253_MODE_REG); 439 440 /* set card's irq and dma levels */ 441 outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); 442 443 /* reset and sync adc clock circuitry */ 444 outw_p(DPD_BIT | APD_BIT, dev->iobase + CONFIG_REG); 445 outw_p(DPD_BIT, dev->iobase + CONFIG_REG); 446 /* initialize configuration register */ 447 devpriv->config_bits = 0; 448 outw(devpriv->config_bits, dev->iobase + CONFIG_REG); 449 /* wait until offset calibration is done, then enable analog inputs */ 450 for (i = 0; i < timeout; i++) { 451 if ((DCAL_BIT & inw(dev->iobase + STATUS_REG)) == 0) 452 break; 453 udelay(1000); 454 } 455 if (i == timeout) { 456 printk 457 (" timed out waiting for offset calibration to complete\n"); 458 return -ETIME; 459 } 460 devpriv->config_bits |= ENABLE0_BIT | ENABLE1_BIT; 461 outw(devpriv->config_bits, dev->iobase + CONFIG_REG); 462 463 return 0; 464}; 465 466static int a2150_detach(struct comedi_device *dev) 467{ 468 printk("comedi%d: %s: remove\n", dev->minor, driver_a2150.driver_name); 469 470 /* only free stuff if it has been allocated by _attach */ 471 if (dev->iobase) { 472 /* put board in power-down mode */ 473 outw(APD_BIT | DPD_BIT, dev->iobase + CONFIG_REG); 474 release_region(dev->iobase, A2150_SIZE); 475 } 476 477 if (dev->irq) 478 free_irq(dev->irq, dev); 479 if (devpriv) { 480 if (devpriv->dma) 481 free_dma(devpriv->dma); 482 kfree(devpriv->dma_buffer); 483 } 484 485 return 0; 486}; 487 488static int a2150_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 489{ 490 /* disable dma on card */ 491 devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT; 492 outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); 493 494 /* disable computer's dma */ 495 disable_dma(devpriv->dma); 496 497 /* clear fifo and reset triggering circuitry */ 498 outw(0, dev->iobase + FIFO_RESET_REG); 499 500 return 0; 501} 502 503static int a2150_ai_cmdtest(struct comedi_device *dev, 504 struct comedi_subdevice *s, struct comedi_cmd *cmd) 505{ 506 int err = 0; 507 int tmp; 508 int startChan; 509 int i; 510 511 /* step 1: make sure trigger sources are trivially valid */ 512 513 tmp = cmd->start_src; 514 cmd->start_src &= TRIG_NOW | TRIG_EXT; 515 if (!cmd->start_src || tmp != cmd->start_src) 516 err++; 517 518 tmp = cmd->scan_begin_src; 519 cmd->scan_begin_src &= TRIG_TIMER; 520 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src) 521 err++; 522 523 tmp = cmd->convert_src; 524 cmd->convert_src &= TRIG_NOW; 525 if (!cmd->convert_src || tmp != cmd->convert_src) 526 err++; 527 528 tmp = cmd->scan_end_src; 529 cmd->scan_end_src &= TRIG_COUNT; 530 if (!cmd->scan_end_src || tmp != cmd->scan_end_src) 531 err++; 532 533 tmp = cmd->stop_src; 534 cmd->stop_src &= TRIG_COUNT | TRIG_NONE; 535 if (!cmd->stop_src || tmp != cmd->stop_src) 536 err++; 537 538 if (err) 539 return 1; 540 541 /* step 2: make sure trigger sources are unique and mutually compatible */ 542 543 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT) 544 err++; 545 if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE) 546 err++; 547 548 if (err) 549 return 2; 550 551 /* step 3: make sure arguments are trivially compatible */ 552 553 if (cmd->start_arg != 0) { 554 cmd->start_arg = 0; 555 err++; 556 } 557 if (cmd->convert_src == TRIG_TIMER) { 558 if (cmd->convert_arg < thisboard->ai_speed) { 559 cmd->convert_arg = thisboard->ai_speed; 560 err++; 561 } 562 } 563 if (!cmd->chanlist_len) { 564 cmd->chanlist_len = 1; 565 err++; 566 } 567 if (cmd->scan_end_arg != cmd->chanlist_len) { 568 cmd->scan_end_arg = cmd->chanlist_len; 569 err++; 570 } 571 if (cmd->stop_src == TRIG_COUNT) { 572 if (!cmd->stop_arg) { 573 cmd->stop_arg = 1; 574 err++; 575 } 576 } else { /* TRIG_NONE */ 577 if (cmd->stop_arg != 0) { 578 cmd->stop_arg = 0; 579 err++; 580 } 581 } 582 583 if (err) 584 return 3; 585 586 /* step 4: fix up any arguments */ 587 588 if (cmd->scan_begin_src == TRIG_TIMER) { 589 tmp = cmd->scan_begin_arg; 590 a2150_get_timing(dev, &cmd->scan_begin_arg, cmd->flags); 591 if (tmp != cmd->scan_begin_arg) 592 err++; 593 } 594 595 if (err) 596 return 4; 597 598 /* check channel/gain list against card's limitations */ 599 if (cmd->chanlist) { 600 startChan = CR_CHAN(cmd->chanlist[0]); 601 for (i = 1; i < cmd->chanlist_len; i++) { 602 if (CR_CHAN(cmd->chanlist[i]) != (startChan + i)) { 603 comedi_error(dev, 604 "entries in chanlist must be consecutive channels, counting upwards\n"); 605 err++; 606 } 607 } 608 if (cmd->chanlist_len == 2 && CR_CHAN(cmd->chanlist[0]) == 1) { 609 comedi_error(dev, 610 "length 2 chanlist must be channels 0,1 or channels 2,3"); 611 err++; 612 } 613 if (cmd->chanlist_len == 3) { 614 comedi_error(dev, 615 "chanlist must have 1,2 or 4 channels"); 616 err++; 617 } 618 if (CR_AREF(cmd->chanlist[0]) != CR_AREF(cmd->chanlist[1]) || 619 CR_AREF(cmd->chanlist[2]) != CR_AREF(cmd->chanlist[3])) { 620 comedi_error(dev, 621 "channels 0/1 and 2/3 must have the same analog reference"); 622 err++; 623 } 624 } 625 626 if (err) 627 return 5; 628 629 return 0; 630} 631 632static int a2150_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) 633{ 634 struct comedi_async *async = s->async; 635 struct comedi_cmd *cmd = &async->cmd; 636 unsigned long lock_flags; 637 unsigned int old_config_bits = devpriv->config_bits; 638 unsigned int trigger_bits; 639 640 if (!dev->irq || !devpriv->dma) { 641 comedi_error(dev, 642 " irq and dma required, cannot do hardware conversions"); 643 return -1; 644 } 645 if (cmd->flags & TRIG_RT) { 646 comedi_error(dev, 647 " dma incompatible with hard real-time interrupt (TRIG_RT), aborting"); 648 return -1; 649 } 650 /* clear fifo and reset triggering circuitry */ 651 outw(0, dev->iobase + FIFO_RESET_REG); 652 653 /* setup chanlist */ 654 if (a2150_set_chanlist(dev, CR_CHAN(cmd->chanlist[0]), 655 cmd->chanlist_len) < 0) 656 return -1; 657 658 /* setup ac/dc coupling */ 659 if (CR_AREF(cmd->chanlist[0]) == AREF_OTHER) 660 devpriv->config_bits |= AC0_BIT; 661 else 662 devpriv->config_bits &= ~AC0_BIT; 663 if (CR_AREF(cmd->chanlist[2]) == AREF_OTHER) 664 devpriv->config_bits |= AC1_BIT; 665 else 666 devpriv->config_bits &= ~AC1_BIT; 667 668 /* setup timing */ 669 a2150_get_timing(dev, &cmd->scan_begin_arg, cmd->flags); 670 671 /* send timing, channel, config bits */ 672 outw(devpriv->config_bits, dev->iobase + CONFIG_REG); 673 674 /* initialize number of samples remaining */ 675 devpriv->count = cmd->stop_arg * cmd->chanlist_len; 676 677 /* enable computer's dma */ 678 lock_flags = claim_dma_lock(); 679 disable_dma(devpriv->dma); 680 /* clear flip-flop to make sure 2-byte registers for 681 * count and address get set correctly */ 682 clear_dma_ff(devpriv->dma); 683 set_dma_addr(devpriv->dma, virt_to_bus(devpriv->dma_buffer)); 684 /* set size of transfer to fill in 1/3 second */ 685#define ONE_THIRD_SECOND 333333333 686 devpriv->dma_transfer_size = 687 sizeof(devpriv->dma_buffer[0]) * cmd->chanlist_len * 688 ONE_THIRD_SECOND / cmd->scan_begin_arg; 689 if (devpriv->dma_transfer_size > A2150_DMA_BUFFER_SIZE) 690 devpriv->dma_transfer_size = A2150_DMA_BUFFER_SIZE; 691 if (devpriv->dma_transfer_size < sizeof(devpriv->dma_buffer[0])) 692 devpriv->dma_transfer_size = sizeof(devpriv->dma_buffer[0]); 693 devpriv->dma_transfer_size -= 694 devpriv->dma_transfer_size % sizeof(devpriv->dma_buffer[0]); 695 set_dma_count(devpriv->dma, devpriv->dma_transfer_size); 696 enable_dma(devpriv->dma); 697 release_dma_lock(lock_flags); 698 699 /* clear dma interrupt before enabling it, to try and get rid of that 700 * one spurious interrupt that has been happening */ 701 outw(0x00, dev->iobase + DMA_TC_CLEAR_REG); 702 703 /* enable dma on card */ 704 devpriv->irq_dma_bits |= DMA_INTR_EN_BIT | DMA_EN_BIT; 705 outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); 706 707 /* may need to wait 72 sampling periods if timing was changed */ 708 i8254_load(dev->iobase + I8253_BASE_REG, 0, 2, 72, 0); 709 710 /* setup start triggering */ 711 trigger_bits = 0; 712 /* decide if we need to wait 72 periods for valid data */ 713 if (cmd->start_src == TRIG_NOW && 714 (old_config_bits & CLOCK_MASK) != 715 (devpriv->config_bits & CLOCK_MASK)) { 716 /* set trigger source to delay trigger */ 717 trigger_bits |= DELAY_TRIGGER_BITS; 718 } else { 719 /* otherwise no delay */ 720 trigger_bits |= POST_TRIGGER_BITS; 721 } 722 /* enable external hardware trigger */ 723 if (cmd->start_src == TRIG_EXT) { 724 trigger_bits |= HW_TRIG_EN; 725 } else if (cmd->start_src == TRIG_OTHER) { 726 /* XXX add support for level/slope start trigger using TRIG_OTHER */ 727 comedi_error(dev, "you shouldn't see this?"); 728 } 729 /* send trigger config bits */ 730 outw(trigger_bits, dev->iobase + TRIGGER_REG); 731 732 /* start acquisition for soft trigger */ 733 if (cmd->start_src == TRIG_NOW) { 734 outw(0, dev->iobase + FIFO_START_REG); 735 } 736#ifdef A2150_DEBUG 737 ni_dump_regs(dev); 738#endif 739 740 return 0; 741} 742 743static int a2150_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s, 744 struct comedi_insn *insn, unsigned int *data) 745{ 746 unsigned int i, n; 747 static const int timeout = 100000; 748 static const int filter_delay = 36; 749 750 /* clear fifo and reset triggering circuitry */ 751 outw(0, dev->iobase + FIFO_RESET_REG); 752 753 /* setup chanlist */ 754 if (a2150_set_chanlist(dev, CR_CHAN(insn->chanspec), 1) < 0) 755 return -1; 756 757 /* set dc coupling */ 758 devpriv->config_bits &= ~AC0_BIT; 759 devpriv->config_bits &= ~AC1_BIT; 760 761 /* send timing, channel, config bits */ 762 outw(devpriv->config_bits, dev->iobase + CONFIG_REG); 763 764 /* disable dma on card */ 765 devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT; 766 outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); 767 768 /* setup start triggering */ 769 outw(0, dev->iobase + TRIGGER_REG); 770 771 /* start acquisition for soft trigger */ 772 outw(0, dev->iobase + FIFO_START_REG); 773 774 /* there is a 35.6 sample delay for data to get through the antialias filter */ 775 for (n = 0; n < filter_delay; n++) { 776 for (i = 0; i < timeout; i++) { 777 if (inw(dev->iobase + STATUS_REG) & FNE_BIT) 778 break; 779 udelay(1); 780 } 781 if (i == timeout) { 782 comedi_error(dev, "timeout"); 783 return -ETIME; 784 } 785 inw(dev->iobase + FIFO_DATA_REG); 786 } 787 788 /* read data */ 789 for (n = 0; n < insn->n; n++) { 790 for (i = 0; i < timeout; i++) { 791 if (inw(dev->iobase + STATUS_REG) & FNE_BIT) 792 break; 793 udelay(1); 794 } 795 if (i == timeout) { 796 comedi_error(dev, "timeout"); 797 return -ETIME; 798 } 799#ifdef A2150_DEBUG 800 ni_dump_regs(dev); 801#endif 802 data[n] = inw(dev->iobase + FIFO_DATA_REG); 803#ifdef A2150_DEBUG 804 printk(" data is %i\n", data[n]); 805#endif 806 data[n] ^= 0x8000; 807 } 808 809 /* clear fifo and reset triggering circuitry */ 810 outw(0, dev->iobase + FIFO_RESET_REG); 811 812 return n; 813} 814 815/* sets bits in devpriv->clock_bits to nearest approximation of requested period, 816 * adjusts requested period to actual timing. */ 817static int a2150_get_timing(struct comedi_device *dev, unsigned int *period, 818 int flags) 819{ 820 int lub, glb, temp; 821 int lub_divisor_shift, lub_index, glb_divisor_shift, glb_index; 822 int i, j; 823 824 /* initialize greatest lower and least upper bounds */ 825 lub_divisor_shift = 3; 826 lub_index = 0; 827 lub = thisboard->clock[lub_index] * (1 << lub_divisor_shift); 828 glb_divisor_shift = 0; 829 glb_index = thisboard->num_clocks - 1; 830 glb = thisboard->clock[glb_index] * (1 << glb_divisor_shift); 831 832 /* make sure period is in available range */ 833 if (*period < glb) 834 *period = glb; 835 if (*period > lub) 836 *period = lub; 837 838 /* we can multiply period by 1, 2, 4, or 8, using (1 << i) */ 839 for (i = 0; i < 4; i++) { 840 /* there are a maximum of 4 master clocks */ 841 for (j = 0; j < thisboard->num_clocks; j++) { 842 /* temp is the period in nanosec we are evaluating */ 843 temp = thisboard->clock[j] * (1 << i); 844 /* if it is the best match yet */ 845 if (temp < lub && temp >= *period) { 846 lub_divisor_shift = i; 847 lub_index = j; 848 lub = temp; 849 } 850 if (temp > glb && temp <= *period) { 851 glb_divisor_shift = i; 852 glb_index = j; 853 glb = temp; 854 } 855 } 856 } 857 flags &= TRIG_ROUND_MASK; 858 switch (flags) { 859 case TRIG_ROUND_NEAREST: 860 default: 861 /* if least upper bound is better approximation */ 862 if (lub - *period < *period - glb) { 863 *period = lub; 864 } else { 865 *period = glb; 866 } 867 break; 868 case TRIG_ROUND_UP: 869 *period = lub; 870 break; 871 case TRIG_ROUND_DOWN: 872 *period = glb; 873 break; 874 } 875 876 /* set clock bits for config register appropriately */ 877 devpriv->config_bits &= ~CLOCK_MASK; 878 if (*period == lub) { 879 devpriv->config_bits |= 880 CLOCK_SELECT_BITS(lub_index) | 881 CLOCK_DIVISOR_BITS(lub_divisor_shift); 882 } else { 883 devpriv->config_bits |= 884 CLOCK_SELECT_BITS(glb_index) | 885 CLOCK_DIVISOR_BITS(glb_divisor_shift); 886 } 887 888 return 0; 889} 890 891static int a2150_set_chanlist(struct comedi_device *dev, 892 unsigned int start_channel, 893 unsigned int num_channels) 894{ 895 if (start_channel + num_channels > 4) 896 return -1; 897 898 devpriv->config_bits &= ~CHANNEL_MASK; 899 900 switch (num_channels) { 901 case 1: 902 devpriv->config_bits |= CHANNEL_BITS(0x4 | start_channel); 903 break; 904 case 2: 905 if (start_channel == 0) { 906 devpriv->config_bits |= CHANNEL_BITS(0x2); 907 } else if (start_channel == 2) { 908 devpriv->config_bits |= CHANNEL_BITS(0x3); 909 } else { 910 return -1; 911 } 912 break; 913 case 4: 914 devpriv->config_bits |= CHANNEL_BITS(0x1); 915 break; 916 default: 917 return -1; 918 break; 919 } 920 921 return 0; 922} 923 924MODULE_AUTHOR("Comedi http://www.comedi.org"); 925MODULE_DESCRIPTION("Comedi low-level driver"); 926MODULE_LICENSE("GPL"); 927