ni_at_a2150.c revision 7114a28011f9d5f3d981731ad341177c21f9d948
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 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 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 aquisition */ 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 if (devpriv->dma_buffer) 483 kfree(devpriv->dma_buffer); 484 } 485 486 return 0; 487}; 488 489static int a2150_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 490{ 491 /* disable dma on card */ 492 devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT; 493 outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); 494 495 /* disable computer's dma */ 496 disable_dma(devpriv->dma); 497 498 /* clear fifo and reset triggering circuitry */ 499 outw(0, dev->iobase + FIFO_RESET_REG); 500 501 return 0; 502} 503 504static int a2150_ai_cmdtest(struct comedi_device *dev, 505 struct comedi_subdevice *s, struct comedi_cmd *cmd) 506{ 507 int err = 0; 508 int tmp; 509 int startChan; 510 int i; 511 512 /* step 1: make sure trigger sources are trivially valid */ 513 514 tmp = cmd->start_src; 515 cmd->start_src &= TRIG_NOW | TRIG_EXT; 516 if (!cmd->start_src || tmp != cmd->start_src) 517 err++; 518 519 tmp = cmd->scan_begin_src; 520 cmd->scan_begin_src &= TRIG_TIMER; 521 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src) 522 err++; 523 524 tmp = cmd->convert_src; 525 cmd->convert_src &= TRIG_NOW; 526 if (!cmd->convert_src || tmp != cmd->convert_src) 527 err++; 528 529 tmp = cmd->scan_end_src; 530 cmd->scan_end_src &= TRIG_COUNT; 531 if (!cmd->scan_end_src || tmp != cmd->scan_end_src) 532 err++; 533 534 tmp = cmd->stop_src; 535 cmd->stop_src &= TRIG_COUNT | TRIG_NONE; 536 if (!cmd->stop_src || tmp != cmd->stop_src) 537 err++; 538 539 if (err) 540 return 1; 541 542 /* step 2: make sure trigger sources are unique and mutually compatible */ 543 544 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT) 545 err++; 546 if (cmd->stop_src != TRIG_COUNT && cmd->stop_src != TRIG_NONE) 547 err++; 548 549 if (err) 550 return 2; 551 552 /* step 3: make sure arguments are trivially compatible */ 553 554 if (cmd->start_arg != 0) { 555 cmd->start_arg = 0; 556 err++; 557 } 558 if (cmd->convert_src == TRIG_TIMER) { 559 if (cmd->convert_arg < thisboard->ai_speed) { 560 cmd->convert_arg = thisboard->ai_speed; 561 err++; 562 } 563 } 564 if (!cmd->chanlist_len) { 565 cmd->chanlist_len = 1; 566 err++; 567 } 568 if (cmd->scan_end_arg != cmd->chanlist_len) { 569 cmd->scan_end_arg = cmd->chanlist_len; 570 err++; 571 } 572 if (cmd->stop_src == TRIG_COUNT) { 573 if (!cmd->stop_arg) { 574 cmd->stop_arg = 1; 575 err++; 576 } 577 } else { /* TRIG_NONE */ 578 if (cmd->stop_arg != 0) { 579 cmd->stop_arg = 0; 580 err++; 581 } 582 } 583 584 if (err) 585 return 3; 586 587 /* step 4: fix up any arguments */ 588 589 if (cmd->scan_begin_src == TRIG_TIMER) { 590 tmp = cmd->scan_begin_arg; 591 a2150_get_timing(dev, &cmd->scan_begin_arg, cmd->flags); 592 if (tmp != cmd->scan_begin_arg) 593 err++; 594 } 595 596 if (err) 597 return 4; 598 599 /* check channel/gain list against card's limitations */ 600 if (cmd->chanlist) { 601 startChan = CR_CHAN(cmd->chanlist[0]); 602 for (i = 1; i < cmd->chanlist_len; i++) { 603 if (CR_CHAN(cmd->chanlist[i]) != (startChan + i)) { 604 comedi_error(dev, 605 "entries in chanlist must be consecutive channels, counting upwards\n"); 606 err++; 607 } 608 } 609 if (cmd->chanlist_len == 2 && CR_CHAN(cmd->chanlist[0]) == 1) { 610 comedi_error(dev, 611 "length 2 chanlist must be channels 0,1 or channels 2,3"); 612 err++; 613 } 614 if (cmd->chanlist_len == 3) { 615 comedi_error(dev, 616 "chanlist must have 1,2 or 4 channels"); 617 err++; 618 } 619 if (CR_AREF(cmd->chanlist[0]) != CR_AREF(cmd->chanlist[1]) || 620 CR_AREF(cmd->chanlist[2]) != CR_AREF(cmd->chanlist[3])) { 621 comedi_error(dev, 622 "channels 0/1 and 2/3 must have the same analog reference"); 623 err++; 624 } 625 } 626 627 if (err) 628 return 5; 629 630 return 0; 631} 632 633static int a2150_ai_cmd(struct comedi_device *dev, struct comedi_subdevice *s) 634{ 635 struct comedi_async *async = s->async; 636 struct comedi_cmd *cmd = &async->cmd; 637 unsigned long lock_flags; 638 unsigned int old_config_bits = devpriv->config_bits; 639 unsigned int trigger_bits; 640 641 if (!dev->irq || !devpriv->dma) { 642 comedi_error(dev, 643 " irq and dma required, cannot do hardware conversions"); 644 return -1; 645 } 646 if (cmd->flags & TRIG_RT) { 647 comedi_error(dev, 648 " dma incompatible with hard real-time interrupt (TRIG_RT), aborting"); 649 return -1; 650 } 651 /* clear fifo and reset triggering circuitry */ 652 outw(0, dev->iobase + FIFO_RESET_REG); 653 654 /* setup chanlist */ 655 if (a2150_set_chanlist(dev, CR_CHAN(cmd->chanlist[0]), 656 cmd->chanlist_len) < 0) 657 return -1; 658 659 /* setup ac/dc coupling */ 660 if (CR_AREF(cmd->chanlist[0]) == AREF_OTHER) 661 devpriv->config_bits |= AC0_BIT; 662 else 663 devpriv->config_bits &= ~AC0_BIT; 664 if (CR_AREF(cmd->chanlist[2]) == AREF_OTHER) 665 devpriv->config_bits |= AC1_BIT; 666 else 667 devpriv->config_bits &= ~AC1_BIT; 668 669 /* setup timing */ 670 a2150_get_timing(dev, &cmd->scan_begin_arg, cmd->flags); 671 672 /* send timing, channel, config bits */ 673 outw(devpriv->config_bits, dev->iobase + CONFIG_REG); 674 675 /* initialize number of samples remaining */ 676 devpriv->count = cmd->stop_arg * cmd->chanlist_len; 677 678 /* enable computer's dma */ 679 lock_flags = claim_dma_lock(); 680 disable_dma(devpriv->dma); 681 /* clear flip-flop to make sure 2-byte registers for 682 * count and address get set correctly */ 683 clear_dma_ff(devpriv->dma); 684 set_dma_addr(devpriv->dma, virt_to_bus(devpriv->dma_buffer)); 685 /* set size of transfer to fill in 1/3 second */ 686#define ONE_THIRD_SECOND 333333333 687 devpriv->dma_transfer_size = 688 sizeof(devpriv->dma_buffer[0]) * cmd->chanlist_len * 689 ONE_THIRD_SECOND / cmd->scan_begin_arg; 690 if (devpriv->dma_transfer_size > A2150_DMA_BUFFER_SIZE) 691 devpriv->dma_transfer_size = A2150_DMA_BUFFER_SIZE; 692 if (devpriv->dma_transfer_size < sizeof(devpriv->dma_buffer[0])) 693 devpriv->dma_transfer_size = sizeof(devpriv->dma_buffer[0]); 694 devpriv->dma_transfer_size -= 695 devpriv->dma_transfer_size % sizeof(devpriv->dma_buffer[0]); 696 set_dma_count(devpriv->dma, devpriv->dma_transfer_size); 697 enable_dma(devpriv->dma); 698 release_dma_lock(lock_flags); 699 700 /* clear dma interrupt before enabling it, to try and get rid of that 701 * one spurious interrupt that has been happening */ 702 outw(0x00, dev->iobase + DMA_TC_CLEAR_REG); 703 704 /* enable dma on card */ 705 devpriv->irq_dma_bits |= DMA_INTR_EN_BIT | DMA_EN_BIT; 706 outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); 707 708 /* may need to wait 72 sampling periods if timing was changed */ 709 i8254_load(dev->iobase + I8253_BASE_REG, 0, 2, 72, 0); 710 711 /* setup start triggering */ 712 trigger_bits = 0; 713 /* decide if we need to wait 72 periods for valid data */ 714 if (cmd->start_src == TRIG_NOW && 715 (old_config_bits & CLOCK_MASK) != 716 (devpriv->config_bits & CLOCK_MASK)) { 717 /* set trigger source to delay trigger */ 718 trigger_bits |= DELAY_TRIGGER_BITS; 719 } else { 720 /* otherwise no delay */ 721 trigger_bits |= POST_TRIGGER_BITS; 722 } 723 /* enable external hardware trigger */ 724 if (cmd->start_src == TRIG_EXT) { 725 trigger_bits |= HW_TRIG_EN; 726 } else if (cmd->start_src == TRIG_OTHER) { 727 /* XXX add support for level/slope start trigger using TRIG_OTHER */ 728 comedi_error(dev, "you shouldn't see this?"); 729 } 730 /* send trigger config bits */ 731 outw(trigger_bits, dev->iobase + TRIGGER_REG); 732 733 /* start aquisition for soft trigger */ 734 if (cmd->start_src == TRIG_NOW) { 735 outw(0, dev->iobase + FIFO_START_REG); 736 } 737#ifdef A2150_DEBUG 738 ni_dump_regs(dev); 739#endif 740 741 return 0; 742} 743 744static int a2150_ai_rinsn(struct comedi_device *dev, struct comedi_subdevice *s, 745 struct comedi_insn *insn, unsigned int *data) 746{ 747 unsigned int i, n; 748 static const int timeout = 100000; 749 static const int filter_delay = 36; 750 751 /* clear fifo and reset triggering circuitry */ 752 outw(0, dev->iobase + FIFO_RESET_REG); 753 754 /* setup chanlist */ 755 if (a2150_set_chanlist(dev, CR_CHAN(insn->chanspec), 1) < 0) 756 return -1; 757 758 /* set dc coupling */ 759 devpriv->config_bits &= ~AC0_BIT; 760 devpriv->config_bits &= ~AC1_BIT; 761 762 /* send timing, channel, config bits */ 763 outw(devpriv->config_bits, dev->iobase + CONFIG_REG); 764 765 /* disable dma on card */ 766 devpriv->irq_dma_bits &= ~DMA_INTR_EN_BIT & ~DMA_EN_BIT; 767 outw(devpriv->irq_dma_bits, dev->iobase + IRQ_DMA_CNTRL_REG); 768 769 /* setup start triggering */ 770 outw(0, dev->iobase + TRIGGER_REG); 771 772 /* start aquisition for soft trigger */ 773 outw(0, dev->iobase + FIFO_START_REG); 774 775 /* there is a 35.6 sample delay for data to get through the antialias filter */ 776 for (n = 0; n < filter_delay; n++) { 777 for (i = 0; i < timeout; i++) { 778 if (inw(dev->iobase + STATUS_REG) & FNE_BIT) 779 break; 780 udelay(1); 781 } 782 if (i == timeout) { 783 comedi_error(dev, "timeout"); 784 return -ETIME; 785 } 786 inw(dev->iobase + FIFO_DATA_REG); 787 } 788 789 /* read data */ 790 for (n = 0; n < insn->n; n++) { 791 for (i = 0; i < timeout; i++) { 792 if (inw(dev->iobase + STATUS_REG) & FNE_BIT) 793 break; 794 udelay(1); 795 } 796 if (i == timeout) { 797 comedi_error(dev, "timeout"); 798 return -ETIME; 799 } 800#ifdef A2150_DEBUG 801 ni_dump_regs(dev); 802#endif 803 data[n] = inw(dev->iobase + FIFO_DATA_REG); 804#ifdef A2150_DEBUG 805 printk(" data is %i\n", data[n]); 806#endif 807 data[n] ^= 0x8000; 808 } 809 810 /* clear fifo and reset triggering circuitry */ 811 outw(0, dev->iobase + FIFO_RESET_REG); 812 813 return n; 814} 815 816/* sets bits in devpriv->clock_bits to nearest approximation of requested period, 817 * adjusts requested period to actual timing. */ 818static int a2150_get_timing(struct comedi_device *dev, unsigned int *period, 819 int flags) 820{ 821 int lub, glb, temp; 822 int lub_divisor_shift, lub_index, glb_divisor_shift, glb_index; 823 int i, j; 824 825 /* initialize greatest lower and least upper bounds */ 826 lub_divisor_shift = 3; 827 lub_index = 0; 828 lub = thisboard->clock[lub_index] * (1 << lub_divisor_shift); 829 glb_divisor_shift = 0; 830 glb_index = thisboard->num_clocks - 1; 831 glb = thisboard->clock[glb_index] * (1 << glb_divisor_shift); 832 833 /* make sure period is in available range */ 834 if (*period < glb) 835 *period = glb; 836 if (*period > lub) 837 *period = lub; 838 839 /* we can multiply period by 1, 2, 4, or 8, using (1 << i) */ 840 for (i = 0; i < 4; i++) { 841 /* there are a maximum of 4 master clocks */ 842 for (j = 0; j < thisboard->num_clocks; j++) { 843 /* temp is the period in nanosec we are evaluating */ 844 temp = thisboard->clock[j] * (1 << i); 845 /* if it is the best match yet */ 846 if (temp < lub && temp >= *period) { 847 lub_divisor_shift = i; 848 lub_index = j; 849 lub = temp; 850 } 851 if (temp > glb && temp <= *period) { 852 glb_divisor_shift = i; 853 glb_index = j; 854 glb = temp; 855 } 856 } 857 } 858 flags &= TRIG_ROUND_MASK; 859 switch (flags) { 860 case TRIG_ROUND_NEAREST: 861 default: 862 /* if least upper bound is better approximation */ 863 if (lub - *period < *period - glb) { 864 *period = lub; 865 } else { 866 *period = glb; 867 } 868 break; 869 case TRIG_ROUND_UP: 870 *period = lub; 871 break; 872 case TRIG_ROUND_DOWN: 873 *period = glb; 874 break; 875 } 876 877 /* set clock bits for config register appropriately */ 878 devpriv->config_bits &= ~CLOCK_MASK; 879 if (*period == lub) { 880 devpriv->config_bits |= 881 CLOCK_SELECT_BITS(lub_index) | 882 CLOCK_DIVISOR_BITS(lub_divisor_shift); 883 } else { 884 devpriv->config_bits |= 885 CLOCK_SELECT_BITS(glb_index) | 886 CLOCK_DIVISOR_BITS(glb_divisor_shift); 887 } 888 889 return 0; 890} 891 892static int a2150_set_chanlist(struct comedi_device *dev, 893 unsigned int start_channel, 894 unsigned int num_channels) 895{ 896 if (start_channel + num_channels > 4) 897 return -1; 898 899 devpriv->config_bits &= ~CHANNEL_MASK; 900 901 switch (num_channels) { 902 case 1: 903 devpriv->config_bits |= CHANNEL_BITS(0x4 | start_channel); 904 break; 905 case 2: 906 if (start_channel == 0) { 907 devpriv->config_bits |= CHANNEL_BITS(0x2); 908 } else if (start_channel == 2) { 909 devpriv->config_bits |= CHANNEL_BITS(0x3); 910 } else { 911 return -1; 912 } 913 break; 914 case 4: 915 devpriv->config_bits |= CHANNEL_BITS(0x1); 916 break; 917 default: 918 return -1; 919 break; 920 } 921 922 return 0; 923} 924 925MODULE_AUTHOR("Comedi http://www.comedi.org"); 926MODULE_DESCRIPTION("Comedi low-level driver"); 927MODULE_LICENSE("GPL"); 928