das1800.c revision 0bdab509bf9c6d838dc0a3b1d68bbf841fc20b5a
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/* 20Driver: das1800 21Description: Keithley Metrabyte DAS1800 (& compatibles) 22Author: Frank Mori Hess <fmhess@users.sourceforge.net> 23Devices: [Keithley Metrabyte] DAS-1701ST (das-1701st), 24 DAS-1701ST-DA (das-1701st-da), DAS-1701/AO (das-1701ao), 25 DAS-1702ST (das-1702st), DAS-1702ST-DA (das-1702st-da), 26 DAS-1702HR (das-1702hr), DAS-1702HR-DA (das-1702hr-da), 27 DAS-1702/AO (das-1702ao), DAS-1801ST (das-1801st), 28 DAS-1801ST-DA (das-1801st-da), DAS-1801HC (das-1801hc), 29 DAS-1801AO (das-1801ao), DAS-1802ST (das-1802st), 30 DAS-1802ST-DA (das-1802st-da), DAS-1802HR (das-1802hr), 31 DAS-1802HR-DA (das-1802hr-da), DAS-1802HC (das-1802hc), 32 DAS-1802AO (das-1802ao) 33Status: works 34 35The waveform analog output on the 'ao' cards is not supported. 36If you need it, send me (Frank Hess) an email. 37 38Configuration options: 39 [0] - I/O port base address 40 [1] - IRQ (optional, required for timed or externally triggered conversions) 41 [2] - DMA0 (optional, requires irq) 42 [3] - DMA1 (optional, requires irq and dma0) 43*/ 44/* 45 46This driver supports the following Keithley boards: 47 48das-1701st 49das-1701st-da 50das-1701ao 51das-1702st 52das-1702st-da 53das-1702hr 54das-1702hr-da 55das-1702ao 56das-1801st 57das-1801st-da 58das-1801hc 59das-1801ao 60das-1802st 61das-1802st-da 62das-1802hr 63das-1802hr-da 64das-1802hc 65das-1802ao 66 67Options: 68 [0] - base io address 69 [1] - irq (optional, required for timed or externally triggered conversions) 70 [2] - dma0 (optional, requires irq) 71 [3] - dma1 (optional, requires irq and dma0) 72 73irq can be omitted, although the cmd interface will not work without it. 74 75analog input cmd triggers supported: 76 start_src: TRIG_NOW | TRIG_EXT 77 scan_begin_src: TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT 78 scan_end_src: TRIG_COUNT 79 convert_src: TRIG_TIMER | TRIG_EXT (TRIG_EXT requires scan_begin_src == TRIG_FOLLOW) 80 stop_src: TRIG_COUNT | TRIG_EXT | TRIG_NONE 81 82scan_begin_src triggers TRIG_TIMER and TRIG_EXT use the card's 83'burst mode' which limits the valid conversion time to 64 microseconds 84(convert_arg <= 64000). This limitation does not apply if scan_begin_src 85is TRIG_FOLLOW. 86 87NOTES: 88Only the DAS-1801ST has been tested by me. 89Unipolar and bipolar ranges cannot be mixed in the channel/gain list. 90 91TODO: 92 Make it automatically allocate irq and dma channels if they are not specified 93 Add support for analog out on 'ao' cards 94 read insn for analog out 95*/ 96 97#include <linux/interrupt.h> 98#include <linux/slab.h> 99#include <linux/io.h> 100#include "../comedidev.h" 101 102#include <linux/ioport.h> 103#include <asm/dma.h> 104 105#include "8253.h" 106#include "comedi_fc.h" 107 108/* misc. defines */ 109#define DAS1800_SIZE 16 /* uses 16 io addresses */ 110#define FIFO_SIZE 1024 /* 1024 sample fifo */ 111#define TIMER_BASE 200 /* 5 Mhz master clock */ 112#define UNIPOLAR 0x4 /* bit that determines whether input range is uni/bipolar */ 113#define DMA_BUF_SIZE 0x1ff00 /* size in bytes of dma buffers */ 114 115/* Registers for the das1800 */ 116#define DAS1800_FIFO 0x0 117#define DAS1800_QRAM 0x0 118#define DAS1800_DAC 0x0 119#define DAS1800_SELECT 0x2 120#define ADC 0x0 121#define QRAM 0x1 122#define DAC(a) (0x2 + a) 123#define DAS1800_DIGITAL 0x3 124#define DAS1800_CONTROL_A 0x4 125#define FFEN 0x1 126#define CGEN 0x4 127#define CGSL 0x8 128#define TGEN 0x10 129#define TGSL 0x20 130#define ATEN 0x80 131#define DAS1800_CONTROL_B 0x5 132#define DMA_CH5 0x1 133#define DMA_CH6 0x2 134#define DMA_CH7 0x3 135#define DMA_CH5_CH6 0x5 136#define DMA_CH6_CH7 0x6 137#define DMA_CH7_CH5 0x7 138#define DMA_ENABLED 0x3 /* mask used to determine if dma is enabled */ 139#define DMA_DUAL 0x4 140#define IRQ3 0x8 141#define IRQ5 0x10 142#define IRQ7 0x18 143#define IRQ10 0x28 144#define IRQ11 0x30 145#define IRQ15 0x38 146#define FIMD 0x40 147#define DAS1800_CONTROL_C 0X6 148#define IPCLK 0x1 149#define XPCLK 0x3 150#define BMDE 0x4 151#define CMEN 0x8 152#define UQEN 0x10 153#define SD 0x40 154#define UB 0x80 155#define DAS1800_STATUS 0x7 156/* bits that prevent interrupt status bits (and CVEN) from being cleared on write */ 157#define CLEAR_INTR_MASK (CVEN_MASK | 0x1f) 158#define INT 0x1 159#define DMATC 0x2 160#define CT0TC 0x8 161#define OVF 0x10 162#define FHF 0x20 163#define FNE 0x40 164#define CVEN_MASK 0x40 /* masks CVEN on write */ 165#define CVEN 0x80 166#define DAS1800_BURST_LENGTH 0x8 167#define DAS1800_BURST_RATE 0x9 168#define DAS1800_QRAM_ADDRESS 0xa 169#define DAS1800_COUNTER 0xc 170 171#define IOBASE2 0x400 /* offset of additional ioports used on 'ao' cards */ 172 173enum { 174 das1701st, das1701st_da, das1702st, das1702st_da, das1702hr, 175 das1702hr_da, 176 das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da, 177 das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao 178}; 179 180/* analog input ranges */ 181static const struct comedi_lrange range_ai_das1801 = { 182 8, 183 { 184 RANGE(-5, 5), 185 RANGE(-1, 1), 186 RANGE(-0.1, 0.1), 187 RANGE(-0.02, 0.02), 188 RANGE(0, 5), 189 RANGE(0, 1), 190 RANGE(0, 0.1), 191 RANGE(0, 0.02), 192 } 193}; 194 195static const struct comedi_lrange range_ai_das1802 = { 196 8, 197 { 198 RANGE(-10, 10), 199 RANGE(-5, 5), 200 RANGE(-2.5, 2.5), 201 RANGE(-1.25, 1.25), 202 RANGE(0, 10), 203 RANGE(0, 5), 204 RANGE(0, 2.5), 205 RANGE(0, 1.25), 206 } 207}; 208 209struct das1800_board { 210 const char *name; 211 int ai_speed; /* max conversion period in nanoseconds */ 212 int resolution; /* bits of ai resolution */ 213 int qram_len; /* length of card's channel / gain queue */ 214 int common; /* supports AREF_COMMON flag */ 215 int do_n_chan; /* number of digital output channels */ 216 int ao_ability; /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */ 217 int ao_n_chan; /* number of analog out channels */ 218 const struct comedi_lrange *range_ai; /* available input ranges */ 219}; 220 221/* Warning: the maximum conversion speeds listed below are 222 * not always achievable depending on board setup (see 223 * user manual.) 224 */ 225static const struct das1800_board das1800_boards[] = { 226 { 227 .name = "das-1701st", 228 .ai_speed = 6250, 229 .resolution = 12, 230 .qram_len = 256, 231 .common = 1, 232 .do_n_chan = 4, 233 .ao_ability = 0, 234 .ao_n_chan = 0, 235 .range_ai = &range_ai_das1801, 236 }, 237 { 238 .name = "das-1701st-da", 239 .ai_speed = 6250, 240 .resolution = 12, 241 .qram_len = 256, 242 .common = 1, 243 .do_n_chan = 4, 244 .ao_ability = 1, 245 .ao_n_chan = 4, 246 .range_ai = &range_ai_das1801, 247 }, 248 { 249 .name = "das-1702st", 250 .ai_speed = 6250, 251 .resolution = 12, 252 .qram_len = 256, 253 .common = 1, 254 .do_n_chan = 4, 255 .ao_ability = 0, 256 .ao_n_chan = 0, 257 .range_ai = &range_ai_das1802, 258 }, 259 { 260 .name = "das-1702st-da", 261 .ai_speed = 6250, 262 .resolution = 12, 263 .qram_len = 256, 264 .common = 1, 265 .do_n_chan = 4, 266 .ao_ability = 1, 267 .ao_n_chan = 4, 268 .range_ai = &range_ai_das1802, 269 }, 270 { 271 .name = "das-1702hr", 272 .ai_speed = 20000, 273 .resolution = 16, 274 .qram_len = 256, 275 .common = 1, 276 .do_n_chan = 4, 277 .ao_ability = 0, 278 .ao_n_chan = 0, 279 .range_ai = &range_ai_das1802, 280 }, 281 { 282 .name = "das-1702hr-da", 283 .ai_speed = 20000, 284 .resolution = 16, 285 .qram_len = 256, 286 .common = 1, 287 .do_n_chan = 4, 288 .ao_ability = 1, 289 .ao_n_chan = 2, 290 .range_ai = &range_ai_das1802, 291 }, 292 { 293 .name = "das-1701ao", 294 .ai_speed = 6250, 295 .resolution = 12, 296 .qram_len = 256, 297 .common = 1, 298 .do_n_chan = 4, 299 .ao_ability = 2, 300 .ao_n_chan = 2, 301 .range_ai = &range_ai_das1801, 302 }, 303 { 304 .name = "das-1702ao", 305 .ai_speed = 6250, 306 .resolution = 12, 307 .qram_len = 256, 308 .common = 1, 309 .do_n_chan = 4, 310 .ao_ability = 2, 311 .ao_n_chan = 2, 312 .range_ai = &range_ai_das1802, 313 }, 314 { 315 .name = "das-1801st", 316 .ai_speed = 3000, 317 .resolution = 12, 318 .qram_len = 256, 319 .common = 1, 320 .do_n_chan = 4, 321 .ao_ability = 0, 322 .ao_n_chan = 0, 323 .range_ai = &range_ai_das1801, 324 }, 325 { 326 .name = "das-1801st-da", 327 .ai_speed = 3000, 328 .resolution = 12, 329 .qram_len = 256, 330 .common = 1, 331 .do_n_chan = 4, 332 .ao_ability = 0, 333 .ao_n_chan = 4, 334 .range_ai = &range_ai_das1801, 335 }, 336 { 337 .name = "das-1802st", 338 .ai_speed = 3000, 339 .resolution = 12, 340 .qram_len = 256, 341 .common = 1, 342 .do_n_chan = 4, 343 .ao_ability = 0, 344 .ao_n_chan = 0, 345 .range_ai = &range_ai_das1802, 346 }, 347 { 348 .name = "das-1802st-da", 349 .ai_speed = 3000, 350 .resolution = 12, 351 .qram_len = 256, 352 .common = 1, 353 .do_n_chan = 4, 354 .ao_ability = 1, 355 .ao_n_chan = 4, 356 .range_ai = &range_ai_das1802, 357 }, 358 { 359 .name = "das-1802hr", 360 .ai_speed = 10000, 361 .resolution = 16, 362 .qram_len = 256, 363 .common = 1, 364 .do_n_chan = 4, 365 .ao_ability = 0, 366 .ao_n_chan = 0, 367 .range_ai = &range_ai_das1802, 368 }, 369 { 370 .name = "das-1802hr-da", 371 .ai_speed = 10000, 372 .resolution = 16, 373 .qram_len = 256, 374 .common = 1, 375 .do_n_chan = 4, 376 .ao_ability = 1, 377 .ao_n_chan = 2, 378 .range_ai = &range_ai_das1802, 379 }, 380 { 381 .name = "das-1801hc", 382 .ai_speed = 3000, 383 .resolution = 12, 384 .qram_len = 64, 385 .common = 0, 386 .do_n_chan = 8, 387 .ao_ability = 1, 388 .ao_n_chan = 2, 389 .range_ai = &range_ai_das1801, 390 }, 391 { 392 .name = "das-1802hc", 393 .ai_speed = 3000, 394 .resolution = 12, 395 .qram_len = 64, 396 .common = 0, 397 .do_n_chan = 8, 398 .ao_ability = 1, 399 .ao_n_chan = 2, 400 .range_ai = &range_ai_das1802, 401 }, 402 { 403 .name = "das-1801ao", 404 .ai_speed = 3000, 405 .resolution = 12, 406 .qram_len = 256, 407 .common = 1, 408 .do_n_chan = 4, 409 .ao_ability = 2, 410 .ao_n_chan = 2, 411 .range_ai = &range_ai_das1801, 412 }, 413 { 414 .name = "das-1802ao", 415 .ai_speed = 3000, 416 .resolution = 12, 417 .qram_len = 256, 418 .common = 1, 419 .do_n_chan = 4, 420 .ao_ability = 2, 421 .ao_n_chan = 2, 422 .range_ai = &range_ai_das1802, 423 }, 424}; 425 426struct das1800_private { 427 volatile unsigned int count; /* number of data points left to be taken */ 428 unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */ 429 unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */ 430 int do_bits; /* digital output bits */ 431 int irq_dma_bits; /* bits for control register b */ 432 /* dma bits for control register b, stored so that dma can be 433 * turned on and off */ 434 int dma_bits; 435 unsigned int dma0; /* dma channels used */ 436 unsigned int dma1; 437 volatile unsigned int dma_current; /* dma channel currently in use */ 438 uint16_t *ai_buf0; /* pointers to dma buffers */ 439 uint16_t *ai_buf1; 440 uint16_t *dma_current_buf; /* pointer to dma buffer currently being used */ 441 unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */ 442 unsigned long iobase2; /* secondary io address used for analog out on 'ao' boards */ 443 short ao_update_bits; /* remembers the last write to the 'update' dac */ 444}; 445 446/* analog out range for 'ao' boards */ 447/* 448static const struct comedi_lrange range_ao_2 = { 449 2, 450 { 451 RANGE(-10, 10), 452 RANGE(-5, 5), 453 } 454}; 455*/ 456 457static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev, 458 uint16_t sample) 459{ 460 const struct das1800_board *thisboard = comedi_board(dev); 461 462 sample += 1 << (thisboard->resolution - 1); 463 return sample; 464} 465 466static void munge_data(struct comedi_device *dev, uint16_t * array, 467 unsigned int num_elements) 468{ 469 unsigned int i; 470 int unipolar; 471 472 /* see if card is using a unipolar or bipolar range so we can munge data correctly */ 473 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB; 474 475 /* convert to unsigned type if we are in a bipolar mode */ 476 if (!unipolar) { 477 for (i = 0; i < num_elements; i++) 478 array[i] = munge_bipolar_sample(dev, array[i]); 479 } 480} 481 482static void das1800_handle_fifo_half_full(struct comedi_device *dev, 483 struct comedi_subdevice *s) 484{ 485 struct das1800_private *devpriv = dev->private; 486 int numPoints = 0; /* number of points to read */ 487 struct comedi_cmd *cmd = &s->async->cmd; 488 489 numPoints = FIFO_SIZE / 2; 490 /* if we only need some of the points */ 491 if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints) 492 numPoints = devpriv->count; 493 insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints); 494 munge_data(dev, devpriv->ai_buf0, numPoints); 495 cfc_write_array_to_buffer(s, devpriv->ai_buf0, 496 numPoints * sizeof(devpriv->ai_buf0[0])); 497 if (cmd->stop_src == TRIG_COUNT) 498 devpriv->count -= numPoints; 499 return; 500} 501 502static void das1800_handle_fifo_not_empty(struct comedi_device *dev, 503 struct comedi_subdevice *s) 504{ 505 struct das1800_private *devpriv = dev->private; 506 short dpnt; 507 int unipolar; 508 struct comedi_cmd *cmd = &s->async->cmd; 509 510 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB; 511 512 while (inb(dev->iobase + DAS1800_STATUS) & FNE) { 513 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) 514 break; 515 dpnt = inw(dev->iobase + DAS1800_FIFO); 516 /* convert to unsigned type if we are in a bipolar mode */ 517 if (!unipolar) 518 ; 519 dpnt = munge_bipolar_sample(dev, dpnt); 520 cfc_write_to_buffer(s, dpnt); 521 if (cmd->stop_src == TRIG_COUNT) 522 devpriv->count--; 523 } 524 525 return; 526} 527 528/* Utility function used by das1800_flush_dma() and das1800_handle_dma(). 529 * Assumes dma lock is held */ 530static void das1800_flush_dma_channel(struct comedi_device *dev, 531 struct comedi_subdevice *s, 532 unsigned int channel, uint16_t *buffer) 533{ 534 struct das1800_private *devpriv = dev->private; 535 unsigned int num_bytes, num_samples; 536 struct comedi_cmd *cmd = &s->async->cmd; 537 538 disable_dma(channel); 539 540 /* clear flip-flop to make sure 2-byte registers 541 * get set correctly */ 542 clear_dma_ff(channel); 543 544 /* figure out how many points to read */ 545 num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel); 546 num_samples = num_bytes / sizeof(short); 547 548 /* if we only need some of the points */ 549 if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples) 550 num_samples = devpriv->count; 551 552 munge_data(dev, buffer, num_samples); 553 cfc_write_array_to_buffer(s, buffer, num_bytes); 554 if (s->async->cmd.stop_src == TRIG_COUNT) 555 devpriv->count -= num_samples; 556 557 return; 558} 559 560/* flushes remaining data from board when external trigger has stopped acquisition 561 * and we are using dma transfers */ 562static void das1800_flush_dma(struct comedi_device *dev, 563 struct comedi_subdevice *s) 564{ 565 struct das1800_private *devpriv = dev->private; 566 unsigned long flags; 567 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 568 569 flags = claim_dma_lock(); 570 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 571 devpriv->dma_current_buf); 572 573 if (dual_dma) { 574 /* switch to other channel and flush it */ 575 if (devpriv->dma_current == devpriv->dma0) { 576 devpriv->dma_current = devpriv->dma1; 577 devpriv->dma_current_buf = devpriv->ai_buf1; 578 } else { 579 devpriv->dma_current = devpriv->dma0; 580 devpriv->dma_current_buf = devpriv->ai_buf0; 581 } 582 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 583 devpriv->dma_current_buf); 584 } 585 586 release_dma_lock(flags); 587 588 /* get any remaining samples in fifo */ 589 das1800_handle_fifo_not_empty(dev, s); 590 591 return; 592} 593 594static void das1800_handle_dma(struct comedi_device *dev, 595 struct comedi_subdevice *s, unsigned int status) 596{ 597 struct das1800_private *devpriv = dev->private; 598 unsigned long flags; 599 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 600 601 flags = claim_dma_lock(); 602 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 603 devpriv->dma_current_buf); 604 /* re-enable dma channel */ 605 set_dma_addr(devpriv->dma_current, 606 virt_to_bus(devpriv->dma_current_buf)); 607 set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size); 608 enable_dma(devpriv->dma_current); 609 release_dma_lock(flags); 610 611 if (status & DMATC) { 612 /* clear DMATC interrupt bit */ 613 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS); 614 /* switch dma channels for next time, if appropriate */ 615 if (dual_dma) { 616 /* read data from the other channel next time */ 617 if (devpriv->dma_current == devpriv->dma0) { 618 devpriv->dma_current = devpriv->dma1; 619 devpriv->dma_current_buf = devpriv->ai_buf1; 620 } else { 621 devpriv->dma_current = devpriv->dma0; 622 devpriv->dma_current_buf = devpriv->ai_buf0; 623 } 624 } 625 } 626 627 return; 628} 629 630static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 631{ 632 struct das1800_private *devpriv = dev->private; 633 634 outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */ 635 outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */ 636 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */ 637 if (devpriv->dma0) 638 disable_dma(devpriv->dma0); 639 if (devpriv->dma1) 640 disable_dma(devpriv->dma1); 641 return 0; 642} 643 644/* the guts of the interrupt handler, that is shared with das1800_ai_poll */ 645static void das1800_ai_handler(struct comedi_device *dev) 646{ 647 struct das1800_private *devpriv = dev->private; 648 struct comedi_subdevice *s = &dev->subdevices[0]; 649 struct comedi_async *async = s->async; 650 struct comedi_cmd *cmd = &async->cmd; 651 unsigned int status = inb(dev->iobase + DAS1800_STATUS); 652 653 async->events = 0; 654 /* select adc for base address + 0 */ 655 outb(ADC, dev->iobase + DAS1800_SELECT); 656 /* dma buffer full */ 657 if (devpriv->irq_dma_bits & DMA_ENABLED) { 658 /* look for data from dma transfer even if dma terminal count hasn't happened yet */ 659 das1800_handle_dma(dev, s, status); 660 } else if (status & FHF) { /* if fifo half full */ 661 das1800_handle_fifo_half_full(dev, s); 662 } else if (status & FNE) { /* if fifo not empty */ 663 das1800_handle_fifo_not_empty(dev, s); 664 } 665 666 async->events |= COMEDI_CB_BLOCK; 667 /* if the card's fifo has overflowed */ 668 if (status & OVF) { 669 /* clear OVF interrupt bit */ 670 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS); 671 comedi_error(dev, "DAS1800 FIFO overflow"); 672 das1800_cancel(dev, s); 673 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA; 674 comedi_event(dev, s); 675 return; 676 } 677 /* stop taking data if appropriate */ 678 /* stop_src TRIG_EXT */ 679 if (status & CT0TC) { 680 /* clear CT0TC interrupt bit */ 681 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS); 682 /* make sure we get all remaining data from board before quitting */ 683 if (devpriv->irq_dma_bits & DMA_ENABLED) 684 das1800_flush_dma(dev, s); 685 else 686 das1800_handle_fifo_not_empty(dev, s); 687 das1800_cancel(dev, s); /* disable hardware conversions */ 688 async->events |= COMEDI_CB_EOA; 689 } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */ 690 das1800_cancel(dev, s); /* disable hardware conversions */ 691 async->events |= COMEDI_CB_EOA; 692 } 693 694 comedi_event(dev, s); 695 696 return; 697} 698 699static int das1800_ai_poll(struct comedi_device *dev, 700 struct comedi_subdevice *s) 701{ 702 unsigned long flags; 703 704 /* prevent race with interrupt handler */ 705 spin_lock_irqsave(&dev->spinlock, flags); 706 das1800_ai_handler(dev); 707 spin_unlock_irqrestore(&dev->spinlock, flags); 708 709 return s->async->buf_write_count - s->async->buf_read_count; 710} 711 712static irqreturn_t das1800_interrupt(int irq, void *d) 713{ 714 struct comedi_device *dev = d; 715 unsigned int status; 716 717 if (!dev->attached) { 718 comedi_error(dev, "premature interrupt"); 719 return IRQ_HANDLED; 720 } 721 722 /* Prevent race with das1800_ai_poll() on multi processor systems. 723 * Also protects indirect addressing in das1800_ai_handler */ 724 spin_lock(&dev->spinlock); 725 status = inb(dev->iobase + DAS1800_STATUS); 726 727 /* if interrupt was not caused by das-1800 */ 728 if (!(status & INT)) { 729 spin_unlock(&dev->spinlock); 730 return IRQ_NONE; 731 } 732 /* clear the interrupt status bit INT */ 733 outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS); 734 /* handle interrupt */ 735 das1800_ai_handler(dev); 736 737 spin_unlock(&dev->spinlock); 738 return IRQ_HANDLED; 739} 740 741/* converts requested conversion timing to timing compatible with 742 * hardware, used only when card is in 'burst mode' 743 */ 744static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode) 745{ 746 unsigned int micro_sec; 747 748 /* in burst mode, the maximum conversion time is 64 microseconds */ 749 if (convert_arg > 64000) 750 convert_arg = 64000; 751 752 /* the conversion time must be an integral number of microseconds */ 753 switch (round_mode) { 754 case TRIG_ROUND_NEAREST: 755 default: 756 micro_sec = (convert_arg + 500) / 1000; 757 break; 758 case TRIG_ROUND_DOWN: 759 micro_sec = convert_arg / 1000; 760 break; 761 case TRIG_ROUND_UP: 762 micro_sec = (convert_arg - 1) / 1000 + 1; 763 break; 764 } 765 766 /* return number of nanoseconds */ 767 return micro_sec * 1000; 768} 769 770/* test analog input cmd */ 771static int das1800_ai_do_cmdtest(struct comedi_device *dev, 772 struct comedi_subdevice *s, 773 struct comedi_cmd *cmd) 774{ 775 const struct das1800_board *thisboard = comedi_board(dev); 776 struct das1800_private *devpriv = dev->private; 777 int err = 0; 778 unsigned int tmp_arg; 779 int i; 780 int unipolar; 781 782 /* Step 1 : check if triggers are trivially valid */ 783 784 err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT); 785 err |= cfc_check_trigger_src(&cmd->scan_begin_src, 786 TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT); 787 err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER | TRIG_EXT); 788 err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT); 789 err |= cfc_check_trigger_src(&cmd->stop_src, 790 TRIG_COUNT | TRIG_EXT | TRIG_NONE); 791 792 if (err) 793 return 1; 794 795 /* Step 2a : make sure trigger sources are unique */ 796 797 err |= cfc_check_trigger_is_unique(cmd->start_src); 798 err |= cfc_check_trigger_is_unique(cmd->scan_begin_src); 799 err |= cfc_check_trigger_is_unique(cmd->convert_src); 800 err |= cfc_check_trigger_is_unique(cmd->stop_src); 801 802 /* Step 2b : and mutually compatible */ 803 804 if (cmd->scan_begin_src != TRIG_FOLLOW && 805 cmd->convert_src != TRIG_TIMER) 806 err |= -EINVAL; 807 808 if (err) 809 return 2; 810 811 /* Step 3: check if arguments are trivially valid */ 812 813 err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0); 814 815 if (cmd->convert_src == TRIG_TIMER) 816 err |= cfc_check_trigger_arg_min(&cmd->convert_arg, 817 thisboard->ai_speed); 818 819 err |= cfc_check_trigger_arg_min(&cmd->chanlist_len, 1); 820 err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len); 821 822 switch (cmd->stop_src) { 823 case TRIG_COUNT: 824 err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1); 825 break; 826 case TRIG_NONE: 827 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0); 828 break; 829 default: 830 break; 831 } 832 833 if (err) 834 return 3; 835 836 /* step 4: fix up any arguments */ 837 838 if (cmd->convert_src == TRIG_TIMER) { 839 /* if we are not in burst mode */ 840 if (cmd->scan_begin_src == TRIG_FOLLOW) { 841 tmp_arg = cmd->convert_arg; 842 /* calculate counter values that give desired timing */ 843 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 844 &(devpriv->divisor1), 845 &(devpriv->divisor2), 846 &(cmd->convert_arg), 847 cmd-> 848 flags & TRIG_ROUND_MASK); 849 if (tmp_arg != cmd->convert_arg) 850 err++; 851 } 852 /* if we are in burst mode */ 853 else { 854 /* check that convert_arg is compatible */ 855 tmp_arg = cmd->convert_arg; 856 cmd->convert_arg = 857 burst_convert_arg(cmd->convert_arg, 858 cmd->flags & TRIG_ROUND_MASK); 859 if (tmp_arg != cmd->convert_arg) 860 err++; 861 862 if (cmd->scan_begin_src == TRIG_TIMER) { 863 /* if scans are timed faster than conversion rate allows */ 864 if (cmd->convert_arg * cmd->chanlist_len > 865 cmd->scan_begin_arg) { 866 cmd->scan_begin_arg = 867 cmd->convert_arg * 868 cmd->chanlist_len; 869 err++; 870 } 871 tmp_arg = cmd->scan_begin_arg; 872 /* calculate counter values that give desired timing */ 873 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 874 &(devpriv-> 875 divisor1), 876 &(devpriv-> 877 divisor2), 878 &(cmd-> 879 scan_begin_arg), 880 cmd-> 881 flags & 882 TRIG_ROUND_MASK); 883 if (tmp_arg != cmd->scan_begin_arg) 884 err++; 885 } 886 } 887 } 888 889 if (err) 890 return 4; 891 892 /* make sure user is not trying to mix unipolar and bipolar ranges */ 893 if (cmd->chanlist) { 894 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR; 895 for (i = 1; i < cmd->chanlist_len; i++) { 896 if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) { 897 comedi_error(dev, 898 "unipolar and bipolar ranges cannot be mixed in the chanlist"); 899 err++; 900 break; 901 } 902 } 903 } 904 905 if (err) 906 return 5; 907 908 return 0; 909} 910 911/* returns appropriate bits for control register a, depending on command */ 912static int control_a_bits(const struct comedi_cmd *cmd) 913{ 914 int control_a; 915 916 control_a = FFEN; /* enable fifo */ 917 if (cmd->stop_src == TRIG_EXT) 918 control_a |= ATEN; 919 switch (cmd->start_src) { 920 case TRIG_EXT: 921 control_a |= TGEN | CGSL; 922 break; 923 case TRIG_NOW: 924 control_a |= CGEN; 925 break; 926 default: 927 break; 928 } 929 930 return control_a; 931} 932 933/* returns appropriate bits for control register c, depending on command */ 934static int control_c_bits(const struct comedi_cmd *cmd) 935{ 936 int control_c; 937 int aref; 938 939 /* set clock source to internal or external, select analog reference, 940 * select unipolar / bipolar 941 */ 942 aref = CR_AREF(cmd->chanlist[0]); 943 control_c = UQEN; /* enable upper qram addresses */ 944 if (aref != AREF_DIFF) 945 control_c |= SD; 946 if (aref == AREF_COMMON) 947 control_c |= CMEN; 948 /* if a unipolar range was selected */ 949 if (CR_RANGE(cmd->chanlist[0]) & UNIPOLAR) 950 control_c |= UB; 951 switch (cmd->scan_begin_src) { 952 case TRIG_FOLLOW: /* not in burst mode */ 953 switch (cmd->convert_src) { 954 case TRIG_TIMER: 955 /* trig on cascaded counters */ 956 control_c |= IPCLK; 957 break; 958 case TRIG_EXT: 959 /* trig on falling edge of external trigger */ 960 control_c |= XPCLK; 961 break; 962 default: 963 break; 964 } 965 break; 966 case TRIG_TIMER: 967 /* burst mode with internal pacer clock */ 968 control_c |= BMDE | IPCLK; 969 break; 970 case TRIG_EXT: 971 /* burst mode with external trigger */ 972 control_c |= BMDE | XPCLK; 973 break; 974 default: 975 break; 976 } 977 978 return control_c; 979} 980 981/* loads counters with divisor1, divisor2 from private structure */ 982static int das1800_set_frequency(struct comedi_device *dev) 983{ 984 struct das1800_private *devpriv = dev->private; 985 int err = 0; 986 987 /* counter 1, mode 2 */ 988 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1, 989 2)) 990 err++; 991 /* counter 2, mode 2 */ 992 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2, 993 2)) 994 err++; 995 if (err) 996 return -1; 997 998 return 0; 999} 1000 1001/* sets up counters */ 1002static int setup_counters(struct comedi_device *dev, 1003 const struct comedi_cmd *cmd) 1004{ 1005 struct das1800_private *devpriv = dev->private; 1006 unsigned int period; 1007 1008 /* setup cascaded counters for conversion/scan frequency */ 1009 switch (cmd->scan_begin_src) { 1010 case TRIG_FOLLOW: /* not in burst mode */ 1011 if (cmd->convert_src == TRIG_TIMER) { 1012 /* set conversion frequency */ 1013 period = cmd->convert_arg; 1014 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 1015 &devpriv->divisor1, 1016 &devpriv->divisor2, 1017 &period, 1018 cmd->flags & 1019 TRIG_ROUND_MASK); 1020 if (das1800_set_frequency(dev) < 0) 1021 return -1; 1022 } 1023 break; 1024 case TRIG_TIMER: /* in burst mode */ 1025 /* set scan frequency */ 1026 period = cmd->scan_begin_arg; 1027 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &devpriv->divisor1, 1028 &devpriv->divisor2, &period, 1029 cmd->flags & TRIG_ROUND_MASK); 1030 if (das1800_set_frequency(dev) < 0) 1031 return -1; 1032 break; 1033 default: 1034 break; 1035 } 1036 1037 /* setup counter 0 for 'about triggering' */ 1038 if (cmd->stop_src == TRIG_EXT) { 1039 /* load counter 0 in mode 0 */ 1040 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0); 1041 } 1042 1043 return 0; 1044} 1045 1046/* utility function that suggests a dma transfer size based on the conversion period 'ns' */ 1047static unsigned int suggest_transfer_size(const struct comedi_cmd *cmd) 1048{ 1049 unsigned int size = DMA_BUF_SIZE; 1050 static const int sample_size = 2; /* size in bytes of one sample from board */ 1051 unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */ 1052 unsigned int max_size; /* maximum size we will allow for a transfer */ 1053 1054 /* make dma buffer fill in 0.3 seconds for timed modes */ 1055 switch (cmd->scan_begin_src) { 1056 case TRIG_FOLLOW: /* not in burst mode */ 1057 if (cmd->convert_src == TRIG_TIMER) 1058 size = (fill_time / cmd->convert_arg) * sample_size; 1059 break; 1060 case TRIG_TIMER: 1061 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) * 1062 sample_size; 1063 break; 1064 default: 1065 size = DMA_BUF_SIZE; 1066 break; 1067 } 1068 1069 /* set a minimum and maximum size allowed */ 1070 max_size = DMA_BUF_SIZE; 1071 /* if we are taking limited number of conversions, limit transfer size to that */ 1072 if (cmd->stop_src == TRIG_COUNT && 1073 cmd->stop_arg * cmd->chanlist_len * sample_size < max_size) 1074 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size; 1075 1076 if (size > max_size) 1077 size = max_size; 1078 if (size < sample_size) 1079 size = sample_size; 1080 1081 return size; 1082} 1083 1084/* sets up dma */ 1085static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd) 1086{ 1087 struct das1800_private *devpriv = dev->private; 1088 unsigned long lock_flags; 1089 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 1090 1091 if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0) 1092 return; 1093 1094 /* determine a reasonable dma transfer size */ 1095 devpriv->dma_transfer_size = suggest_transfer_size(cmd); 1096 lock_flags = claim_dma_lock(); 1097 disable_dma(devpriv->dma0); 1098 /* clear flip-flop to make sure 2-byte registers for 1099 * count and address get set correctly */ 1100 clear_dma_ff(devpriv->dma0); 1101 set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0)); 1102 /* set appropriate size of transfer */ 1103 set_dma_count(devpriv->dma0, devpriv->dma_transfer_size); 1104 devpriv->dma_current = devpriv->dma0; 1105 devpriv->dma_current_buf = devpriv->ai_buf0; 1106 enable_dma(devpriv->dma0); 1107 /* set up dual dma if appropriate */ 1108 if (dual_dma) { 1109 disable_dma(devpriv->dma1); 1110 /* clear flip-flop to make sure 2-byte registers for 1111 * count and address get set correctly */ 1112 clear_dma_ff(devpriv->dma1); 1113 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1)); 1114 /* set appropriate size of transfer */ 1115 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size); 1116 enable_dma(devpriv->dma1); 1117 } 1118 release_dma_lock(lock_flags); 1119 1120 return; 1121} 1122 1123/* programs channel/gain list into card */ 1124static void program_chanlist(struct comedi_device *dev, 1125 const struct comedi_cmd *cmd) 1126{ 1127 int i, n, chan_range; 1128 unsigned long irq_flags; 1129 const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */ 1130 const int range_bitshift = 8; 1131 1132 n = cmd->chanlist_len; 1133 /* spinlock protects indirect addressing */ 1134 spin_lock_irqsave(&dev->spinlock, irq_flags); 1135 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */ 1136 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */ 1137 /* make channel / gain list */ 1138 for (i = 0; i < n; i++) { 1139 chan_range = 1140 CR_CHAN(cmd->chanlist[i]) | 1141 ((CR_RANGE(cmd->chanlist[i]) & range_mask) << 1142 range_bitshift); 1143 outw(chan_range, dev->iobase + DAS1800_QRAM); 1144 } 1145 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */ 1146 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1147 1148 return; 1149} 1150 1151/* analog input do_cmd */ 1152static int das1800_ai_do_cmd(struct comedi_device *dev, 1153 struct comedi_subdevice *s) 1154{ 1155 struct das1800_private *devpriv = dev->private; 1156 int ret; 1157 int control_a, control_c; 1158 struct comedi_async *async = s->async; 1159 const struct comedi_cmd *cmd = &async->cmd; 1160 1161 if (!dev->irq) { 1162 comedi_error(dev, 1163 "no irq assigned for das-1800, cannot do hardware conversions"); 1164 return -1; 1165 } 1166 1167 /* disable dma on TRIG_WAKE_EOS, or TRIG_RT 1168 * (because dma in handler is unsafe at hard real-time priority) */ 1169 if (cmd->flags & (TRIG_WAKE_EOS | TRIG_RT)) 1170 devpriv->irq_dma_bits &= ~DMA_ENABLED; 1171 else 1172 devpriv->irq_dma_bits |= devpriv->dma_bits; 1173 /* interrupt on end of conversion for TRIG_WAKE_EOS */ 1174 if (cmd->flags & TRIG_WAKE_EOS) { 1175 /* interrupt fifo not empty */ 1176 devpriv->irq_dma_bits &= ~FIMD; 1177 } else { 1178 /* interrupt fifo half full */ 1179 devpriv->irq_dma_bits |= FIMD; 1180 } 1181 /* determine how many conversions we need */ 1182 if (cmd->stop_src == TRIG_COUNT) 1183 devpriv->count = cmd->stop_arg * cmd->chanlist_len; 1184 1185 das1800_cancel(dev, s); 1186 1187 /* determine proper bits for control registers */ 1188 control_a = control_a_bits(cmd); 1189 control_c = control_c_bits(cmd); 1190 1191 /* setup card and start */ 1192 program_chanlist(dev, cmd); 1193 ret = setup_counters(dev, cmd); 1194 if (ret < 0) { 1195 comedi_error(dev, "Error setting up counters"); 1196 return ret; 1197 } 1198 setup_dma(dev, cmd); 1199 outb(control_c, dev->iobase + DAS1800_CONTROL_C); 1200 /* set conversion rate and length for burst mode */ 1201 if (control_c & BMDE) { 1202 /* program conversion period with number of microseconds minus 1 */ 1203 outb(cmd->convert_arg / 1000 - 1, 1204 dev->iobase + DAS1800_BURST_RATE); 1205 outb(cmd->chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH); 1206 } 1207 outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */ 1208 outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */ 1209 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */ 1210 1211 return 0; 1212} 1213 1214/* read analog input */ 1215static int das1800_ai_rinsn(struct comedi_device *dev, 1216 struct comedi_subdevice *s, 1217 struct comedi_insn *insn, unsigned int *data) 1218{ 1219 const struct das1800_board *thisboard = comedi_board(dev); 1220 int i, n; 1221 int chan, range, aref, chan_range; 1222 int timeout = 1000; 1223 short dpnt; 1224 int conv_flags = 0; 1225 unsigned long irq_flags; 1226 1227 /* set up analog reference and unipolar / bipolar mode */ 1228 aref = CR_AREF(insn->chanspec); 1229 conv_flags |= UQEN; 1230 if (aref != AREF_DIFF) 1231 conv_flags |= SD; 1232 if (aref == AREF_COMMON) 1233 conv_flags |= CMEN; 1234 /* if a unipolar range was selected */ 1235 if (CR_RANGE(insn->chanspec) & UNIPOLAR) 1236 conv_flags |= UB; 1237 1238 outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */ 1239 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */ 1240 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */ 1241 outb(FFEN, dev->iobase + DAS1800_CONTROL_A); 1242 1243 chan = CR_CHAN(insn->chanspec); 1244 /* mask of unipolar/bipolar bit from range */ 1245 range = CR_RANGE(insn->chanspec) & 0x3; 1246 chan_range = chan | (range << 8); 1247 spin_lock_irqsave(&dev->spinlock, irq_flags); 1248 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */ 1249 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */ 1250 outw(chan_range, dev->iobase + DAS1800_QRAM); 1251 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */ 1252 outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */ 1253 1254 for (n = 0; n < insn->n; n++) { 1255 /* trigger conversion */ 1256 outb(0, dev->iobase + DAS1800_FIFO); 1257 for (i = 0; i < timeout; i++) { 1258 if (inb(dev->iobase + DAS1800_STATUS) & FNE) 1259 break; 1260 } 1261 if (i == timeout) { 1262 comedi_error(dev, "timeout"); 1263 n = -ETIME; 1264 goto exit; 1265 } 1266 dpnt = inw(dev->iobase + DAS1800_FIFO); 1267 /* shift data to offset binary for bipolar ranges */ 1268 if ((conv_flags & UB) == 0) 1269 dpnt += 1 << (thisboard->resolution - 1); 1270 data[n] = dpnt; 1271 } 1272exit: 1273 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1274 1275 return n; 1276} 1277 1278/* writes to an analog output channel */ 1279static int das1800_ao_winsn(struct comedi_device *dev, 1280 struct comedi_subdevice *s, 1281 struct comedi_insn *insn, unsigned int *data) 1282{ 1283 const struct das1800_board *thisboard = comedi_board(dev); 1284 struct das1800_private *devpriv = dev->private; 1285 int chan = CR_CHAN(insn->chanspec); 1286/* int range = CR_RANGE(insn->chanspec); */ 1287 int update_chan = thisboard->ao_n_chan - 1; 1288 short output; 1289 unsigned long irq_flags; 1290 1291 /* card expects two's complement data */ 1292 output = data[0] - (1 << (thisboard->resolution - 1)); 1293 /* if the write is to the 'update' channel, we need to remember its value */ 1294 if (chan == update_chan) 1295 devpriv->ao_update_bits = output; 1296 /* write to channel */ 1297 spin_lock_irqsave(&dev->spinlock, irq_flags); 1298 outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */ 1299 outw(output, dev->iobase + DAS1800_DAC); 1300 /* now we need to write to 'update' channel to update all dac channels */ 1301 if (chan != update_chan) { 1302 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */ 1303 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC); 1304 } 1305 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1306 1307 return 1; 1308} 1309 1310/* reads from digital input channels */ 1311static int das1800_di_rbits(struct comedi_device *dev, 1312 struct comedi_subdevice *s, 1313 struct comedi_insn *insn, unsigned int *data) 1314{ 1315 1316 data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf; 1317 data[0] = 0; 1318 1319 return insn->n; 1320} 1321 1322/* writes to digital output channels */ 1323static int das1800_do_wbits(struct comedi_device *dev, 1324 struct comedi_subdevice *s, 1325 struct comedi_insn *insn, unsigned int *data) 1326{ 1327 struct das1800_private *devpriv = dev->private; 1328 unsigned int wbits; 1329 1330 /* only set bits that have been masked */ 1331 data[0] &= (1 << s->n_chan) - 1; 1332 wbits = devpriv->do_bits; 1333 wbits &= ~data[0]; 1334 wbits |= data[0] & data[1]; 1335 devpriv->do_bits = wbits; 1336 1337 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL); 1338 1339 data[1] = devpriv->do_bits; 1340 1341 return insn->n; 1342} 1343 1344static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0, 1345 unsigned int dma1) 1346{ 1347 struct das1800_private *devpriv = dev->private; 1348 unsigned long flags; 1349 1350 /* need an irq to do dma */ 1351 if (dev->irq && dma0) { 1352 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */ 1353 switch ((dma0 & 0x7) | (dma1 << 4)) { 1354 case 0x5: /* dma0 == 5 */ 1355 devpriv->dma_bits |= DMA_CH5; 1356 break; 1357 case 0x6: /* dma0 == 6 */ 1358 devpriv->dma_bits |= DMA_CH6; 1359 break; 1360 case 0x7: /* dma0 == 7 */ 1361 devpriv->dma_bits |= DMA_CH7; 1362 break; 1363 case 0x65: /* dma0 == 5, dma1 == 6 */ 1364 devpriv->dma_bits |= DMA_CH5_CH6; 1365 break; 1366 case 0x76: /* dma0 == 6, dma1 == 7 */ 1367 devpriv->dma_bits |= DMA_CH6_CH7; 1368 break; 1369 case 0x57: /* dma0 == 7, dma1 == 5 */ 1370 devpriv->dma_bits |= DMA_CH7_CH5; 1371 break; 1372 default: 1373 dev_err(dev->class_dev, 1374 "only supports dma channels 5 through 7\n"); 1375 dev_err(dev->class_dev, 1376 "Dual dma only allows the following combinations:\n"); 1377 dev_err(dev->class_dev, 1378 "dma 5,6 / 6,7 / or 7,5\n"); 1379 return -EINVAL; 1380 break; 1381 } 1382 if (request_dma(dma0, dev->driver->driver_name)) { 1383 dev_err(dev->class_dev, 1384 "failed to allocate dma channel %i\n", dma0); 1385 return -EINVAL; 1386 } 1387 devpriv->dma0 = dma0; 1388 devpriv->dma_current = dma0; 1389 if (dma1) { 1390 if (request_dma(dma1, dev->driver->driver_name)) { 1391 dev_err(dev->class_dev, 1392 "failed to allocate dma channel %i\n", 1393 dma1); 1394 return -EINVAL; 1395 } 1396 devpriv->dma1 = dma1; 1397 } 1398 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA); 1399 if (devpriv->ai_buf0 == NULL) 1400 return -ENOMEM; 1401 devpriv->dma_current_buf = devpriv->ai_buf0; 1402 if (dma1) { 1403 devpriv->ai_buf1 = 1404 kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA); 1405 if (devpriv->ai_buf1 == NULL) 1406 return -ENOMEM; 1407 } 1408 flags = claim_dma_lock(); 1409 disable_dma(devpriv->dma0); 1410 set_dma_mode(devpriv->dma0, DMA_MODE_READ); 1411 if (dma1) { 1412 disable_dma(devpriv->dma1); 1413 set_dma_mode(devpriv->dma1, DMA_MODE_READ); 1414 } 1415 release_dma_lock(flags); 1416 } 1417 return 0; 1418} 1419 1420static int das1800_probe(struct comedi_device *dev) 1421{ 1422 int id; 1423 int board; 1424 1425 id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */ 1426 board = ((struct das1800_board *)dev->board_ptr) - das1800_boards; 1427 1428 switch (id) { 1429 case 0x3: 1430 if (board == das1801st_da || board == das1802st_da || 1431 board == das1701st_da || board == das1702st_da) { 1432 dev_dbg(dev->class_dev, "Board model: %s\n", 1433 das1800_boards[board].name); 1434 return board; 1435 } 1436 printk 1437 (" Board model (probed, not recommended): das-1800st-da series\n"); 1438 return das1801st; 1439 break; 1440 case 0x4: 1441 if (board == das1802hr_da || board == das1702hr_da) { 1442 dev_dbg(dev->class_dev, "Board model: %s\n", 1443 das1800_boards[board].name); 1444 return board; 1445 } 1446 printk 1447 (" Board model (probed, not recommended): das-1802hr-da\n"); 1448 return das1802hr; 1449 break; 1450 case 0x5: 1451 if (board == das1801ao || board == das1802ao || 1452 board == das1701ao || board == das1702ao) { 1453 dev_dbg(dev->class_dev, "Board model: %s\n", 1454 das1800_boards[board].name); 1455 return board; 1456 } 1457 printk 1458 (" Board model (probed, not recommended): das-1800ao series\n"); 1459 return das1801ao; 1460 break; 1461 case 0x6: 1462 if (board == das1802hr || board == das1702hr) { 1463 dev_dbg(dev->class_dev, "Board model: %s\n", 1464 das1800_boards[board].name); 1465 return board; 1466 } 1467 printk 1468 (" Board model (probed, not recommended): das-1802hr\n"); 1469 return das1802hr; 1470 break; 1471 case 0x7: 1472 if (board == das1801st || board == das1802st || 1473 board == das1701st || board == das1702st) { 1474 dev_dbg(dev->class_dev, "Board model: %s\n", 1475 das1800_boards[board].name); 1476 return board; 1477 } 1478 printk 1479 (" Board model (probed, not recommended): das-1800st series\n"); 1480 return das1801st; 1481 break; 1482 case 0x8: 1483 if (board == das1801hc || board == das1802hc) { 1484 dev_dbg(dev->class_dev, "Board model: %s\n", 1485 das1800_boards[board].name); 1486 return board; 1487 } 1488 printk 1489 (" Board model (probed, not recommended): das-1800hc series\n"); 1490 return das1801hc; 1491 break; 1492 default: 1493 printk 1494 (" Board model: probe returned 0x%x (unknown, please report)\n", 1495 id); 1496 return board; 1497 break; 1498 } 1499 return -1; 1500} 1501 1502static int das1800_attach(struct comedi_device *dev, 1503 struct comedi_devconfig *it) 1504{ 1505 const struct das1800_board *thisboard = comedi_board(dev); 1506 struct das1800_private *devpriv; 1507 struct comedi_subdevice *s; 1508 unsigned int irq = it->options[1]; 1509 unsigned int dma0 = it->options[2]; 1510 unsigned int dma1 = it->options[3]; 1511 int board; 1512 int ret; 1513 1514 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); 1515 if (!devpriv) 1516 return -ENOMEM; 1517 1518 ret = comedi_request_region(dev, it->options[0], DAS1800_SIZE); 1519 if (ret) 1520 return ret; 1521 1522 board = das1800_probe(dev); 1523 if (board < 0) { 1524 dev_err(dev->class_dev, "unable to determine board type\n"); 1525 return -ENODEV; 1526 } 1527 1528 dev->board_ptr = das1800_boards + board; 1529 thisboard = comedi_board(dev); 1530 dev->board_name = thisboard->name; 1531 1532 /* if it is an 'ao' board with fancy analog out then we need extra io ports */ 1533 if (thisboard->ao_ability == 2) { 1534 unsigned long iobase2 = dev->iobase + IOBASE2; 1535 1536 ret = __comedi_request_region(dev, iobase2, DAS1800_SIZE); 1537 if (ret) 1538 return ret; 1539 devpriv->iobase2 = iobase2; 1540 } 1541 1542 /* grab our IRQ */ 1543 if (irq) { 1544 if (request_irq(irq, das1800_interrupt, 0, 1545 dev->driver->driver_name, dev)) { 1546 dev_dbg(dev->class_dev, "unable to allocate irq %u\n", 1547 irq); 1548 return -EINVAL; 1549 } 1550 } 1551 dev->irq = irq; 1552 1553 /* set bits that tell card which irq to use */ 1554 switch (irq) { 1555 case 0: 1556 break; 1557 case 3: 1558 devpriv->irq_dma_bits |= 0x8; 1559 break; 1560 case 5: 1561 devpriv->irq_dma_bits |= 0x10; 1562 break; 1563 case 7: 1564 devpriv->irq_dma_bits |= 0x18; 1565 break; 1566 case 10: 1567 devpriv->irq_dma_bits |= 0x28; 1568 break; 1569 case 11: 1570 devpriv->irq_dma_bits |= 0x30; 1571 break; 1572 case 15: 1573 devpriv->irq_dma_bits |= 0x38; 1574 break; 1575 default: 1576 dev_err(dev->class_dev, "irq out of range\n"); 1577 return -EINVAL; 1578 break; 1579 } 1580 1581 ret = das1800_init_dma(dev, dma0, dma1); 1582 if (ret < 0) 1583 return ret; 1584 1585 if (devpriv->ai_buf0 == NULL) { 1586 devpriv->ai_buf0 = 1587 kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL); 1588 if (devpriv->ai_buf0 == NULL) 1589 return -ENOMEM; 1590 } 1591 1592 ret = comedi_alloc_subdevices(dev, 4); 1593 if (ret) 1594 return ret; 1595 1596 /* analog input subdevice */ 1597 s = &dev->subdevices[0]; 1598 dev->read_subdev = s; 1599 s->type = COMEDI_SUBD_AI; 1600 s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ; 1601 if (thisboard->common) 1602 s->subdev_flags |= SDF_COMMON; 1603 s->n_chan = thisboard->qram_len; 1604 s->len_chanlist = thisboard->qram_len; 1605 s->maxdata = (1 << thisboard->resolution) - 1; 1606 s->range_table = thisboard->range_ai; 1607 s->do_cmd = das1800_ai_do_cmd; 1608 s->do_cmdtest = das1800_ai_do_cmdtest; 1609 s->insn_read = das1800_ai_rinsn; 1610 s->poll = das1800_ai_poll; 1611 s->cancel = das1800_cancel; 1612 1613 /* analog out */ 1614 s = &dev->subdevices[1]; 1615 if (thisboard->ao_ability == 1) { 1616 s->type = COMEDI_SUBD_AO; 1617 s->subdev_flags = SDF_WRITABLE; 1618 s->n_chan = thisboard->ao_n_chan; 1619 s->maxdata = (1 << thisboard->resolution) - 1; 1620 s->range_table = &range_bipolar10; 1621 s->insn_write = das1800_ao_winsn; 1622 } else { 1623 s->type = COMEDI_SUBD_UNUSED; 1624 } 1625 1626 /* di */ 1627 s = &dev->subdevices[2]; 1628 s->type = COMEDI_SUBD_DI; 1629 s->subdev_flags = SDF_READABLE; 1630 s->n_chan = 4; 1631 s->maxdata = 1; 1632 s->range_table = &range_digital; 1633 s->insn_bits = das1800_di_rbits; 1634 1635 /* do */ 1636 s = &dev->subdevices[3]; 1637 s->type = COMEDI_SUBD_DO; 1638 s->subdev_flags = SDF_WRITABLE | SDF_READABLE; 1639 s->n_chan = thisboard->do_n_chan; 1640 s->maxdata = 1; 1641 s->range_table = &range_digital; 1642 s->insn_bits = das1800_do_wbits; 1643 1644 das1800_cancel(dev, dev->read_subdev); 1645 1646 /* initialize digital out channels */ 1647 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL); 1648 1649 /* initialize analog out channels */ 1650 if (thisboard->ao_ability == 1) { 1651 /* select 'update' dac channel for baseAddress + 0x0 */ 1652 outb(DAC(thisboard->ao_n_chan - 1), 1653 dev->iobase + DAS1800_SELECT); 1654 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC); 1655 } 1656 1657 return 0; 1658}; 1659 1660static void das1800_detach(struct comedi_device *dev) 1661{ 1662 struct das1800_private *devpriv = dev->private; 1663 1664 if (devpriv) { 1665 if (devpriv->dma0) 1666 free_dma(devpriv->dma0); 1667 if (devpriv->dma1) 1668 free_dma(devpriv->dma1); 1669 kfree(devpriv->ai_buf0); 1670 kfree(devpriv->ai_buf1); 1671 if (devpriv->iobase2) 1672 release_region(devpriv->iobase2, DAS1800_SIZE); 1673 } 1674 comedi_legacy_detach(dev); 1675} 1676 1677static struct comedi_driver das1800_driver = { 1678 .driver_name = "das1800", 1679 .module = THIS_MODULE, 1680 .attach = das1800_attach, 1681 .detach = das1800_detach, 1682 .num_names = ARRAY_SIZE(das1800_boards), 1683 .board_name = &das1800_boards[0].name, 1684 .offset = sizeof(struct das1800_board), 1685}; 1686module_comedi_driver(das1800_driver); 1687 1688MODULE_AUTHOR("Comedi http://www.comedi.org"); 1689MODULE_DESCRIPTION("Comedi low-level driver"); 1690MODULE_LICENSE("GPL"); 1691