das1800.c revision 5a0e3ad6af8660be21ca98a971cd00f331318c05
1/* 2 comedi/drivers/das1800.c 3 Driver for Keitley das1700/das1800 series boards 4 Copyright (C) 2000 Frank Mori Hess <fmhess@users.sourceforge.net> 5 6 COMEDI - Linux Control and Measurement Device Interface 7 Copyright (C) 2000 David A. Schleef <ds@schleef.org> 8 9 This program is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 2 of the License, or 12 (at your option) any later version. 13 14 This program is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with this program; if not, write to the Free Software 21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 23************************************************************************ 24*/ 25/* 26Driver: das1800 27Description: Keithley Metrabyte DAS1800 (& compatibles) 28Author: Frank Mori Hess <fmhess@users.sourceforge.net> 29Devices: [Keithley Metrabyte] DAS-1701ST (das-1701st), 30 DAS-1701ST-DA (das-1701st-da), DAS-1701/AO (das-1701ao), 31 DAS-1702ST (das-1702st), DAS-1702ST-DA (das-1702st-da), 32 DAS-1702HR (das-1702hr), DAS-1702HR-DA (das-1702hr-da), 33 DAS-1702/AO (das-1702ao), DAS-1801ST (das-1801st), 34 DAS-1801ST-DA (das-1801st-da), DAS-1801HC (das-1801hc), 35 DAS-1801AO (das-1801ao), DAS-1802ST (das-1802st), 36 DAS-1802ST-DA (das-1802st-da), DAS-1802HR (das-1802hr), 37 DAS-1802HR-DA (das-1802hr-da), DAS-1802HC (das-1802hc), 38 DAS-1802AO (das-1802ao) 39Status: works 40 41The waveform analog output on the 'ao' cards is not supported. 42If you need it, send me (Frank Hess) an email. 43 44Configuration options: 45 [0] - I/O port base address 46 [1] - IRQ (optional, required for timed or externally triggered conversions) 47 [2] - DMA0 (optional, requires irq) 48 [3] - DMA1 (optional, requires irq and dma0) 49*/ 50/* 51 52This driver supports the following Keithley boards: 53 54das-1701st 55das-1701st-da 56das-1701ao 57das-1702st 58das-1702st-da 59das-1702hr 60das-1702hr-da 61das-1702ao 62das-1801st 63das-1801st-da 64das-1801hc 65das-1801ao 66das-1802st 67das-1802st-da 68das-1802hr 69das-1802hr-da 70das-1802hc 71das-1802ao 72 73Options: 74 [0] - base io address 75 [1] - irq (optional, required for timed or externally triggered conversions) 76 [2] - dma0 (optional, requires irq) 77 [3] - dma1 (optional, requires irq and dma0) 78 79irq can be omitted, although the cmd interface will not work without it. 80 81analog input cmd triggers supported: 82 start_src: TRIG_NOW | TRIG_EXT 83 scan_begin_src: TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT 84 scan_end_src: TRIG_COUNT 85 convert_src: TRIG_TIMER | TRIG_EXT (TRIG_EXT requires scan_begin_src == TRIG_FOLLOW) 86 stop_src: TRIG_COUNT | TRIG_EXT | TRIG_NONE 87 88scan_begin_src triggers TRIG_TIMER and TRIG_EXT use the card's 89'burst mode' which limits the valid conversion time to 64 microseconds 90(convert_arg <= 64000). This limitation does not apply if scan_begin_src 91is TRIG_FOLLOW. 92 93NOTES: 94Only the DAS-1801ST has been tested by me. 95Unipolar and bipolar ranges cannot be mixed in the channel/gain list. 96 97TODO: 98 Make it automatically allocate irq and dma channels if they are not specified 99 Add support for analog out on 'ao' cards 100 read insn for analog out 101*/ 102 103#include <linux/interrupt.h> 104#include <linux/slab.h> 105#include "../comedidev.h" 106 107#include <linux/ioport.h> 108#include <asm/dma.h> 109 110#include "8253.h" 111#include "comedi_fc.h" 112 113/* misc. defines */ 114#define DAS1800_SIZE 16 /* uses 16 io addresses */ 115#define FIFO_SIZE 1024 /* 1024 sample fifo */ 116#define TIMER_BASE 200 /* 5 Mhz master clock */ 117#define UNIPOLAR 0x4 /* bit that determines whether input range is uni/bipolar */ 118#define DMA_BUF_SIZE 0x1ff00 /* size in bytes of dma buffers */ 119 120/* Registers for the das1800 */ 121#define DAS1800_FIFO 0x0 122#define DAS1800_QRAM 0x0 123#define DAS1800_DAC 0x0 124#define DAS1800_SELECT 0x2 125#define ADC 0x0 126#define QRAM 0x1 127#define DAC(a) (0x2 + a) 128#define DAS1800_DIGITAL 0x3 129#define DAS1800_CONTROL_A 0x4 130#define FFEN 0x1 131#define CGEN 0x4 132#define CGSL 0x8 133#define TGEN 0x10 134#define TGSL 0x20 135#define ATEN 0x80 136#define DAS1800_CONTROL_B 0x5 137#define DMA_CH5 0x1 138#define DMA_CH6 0x2 139#define DMA_CH7 0x3 140#define DMA_CH5_CH6 0x5 141#define DMA_CH6_CH7 0x6 142#define DMA_CH7_CH5 0x7 143#define DMA_ENABLED 0x3 /* mask used to determine if dma is enabled */ 144#define DMA_DUAL 0x4 145#define IRQ3 0x8 146#define IRQ5 0x10 147#define IRQ7 0x18 148#define IRQ10 0x28 149#define IRQ11 0x30 150#define IRQ15 0x38 151#define FIMD 0x40 152#define DAS1800_CONTROL_C 0X6 153#define IPCLK 0x1 154#define XPCLK 0x3 155#define BMDE 0x4 156#define CMEN 0x8 157#define UQEN 0x10 158#define SD 0x40 159#define UB 0x80 160#define DAS1800_STATUS 0x7 161/* bits that prevent interrupt status bits (and CVEN) from being cleared on write */ 162#define CLEAR_INTR_MASK (CVEN_MASK | 0x1f) 163#define INT 0x1 164#define DMATC 0x2 165#define CT0TC 0x8 166#define OVF 0x10 167#define FHF 0x20 168#define FNE 0x40 169#define CVEN_MASK 0x40 /* masks CVEN on write */ 170#define CVEN 0x80 171#define DAS1800_BURST_LENGTH 0x8 172#define DAS1800_BURST_RATE 0x9 173#define DAS1800_QRAM_ADDRESS 0xa 174#define DAS1800_COUNTER 0xc 175 176#define IOBASE2 0x400 /* offset of additional ioports used on 'ao' cards */ 177 178enum { 179 das1701st, das1701st_da, das1702st, das1702st_da, das1702hr, 180 das1702hr_da, 181 das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da, 182 das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao 183}; 184 185static int das1800_attach(struct comedi_device *dev, 186 struct comedi_devconfig *it); 187static int das1800_detach(struct comedi_device *dev); 188static int das1800_probe(struct comedi_device *dev); 189static int das1800_cancel(struct comedi_device *dev, 190 struct comedi_subdevice *s); 191static irqreturn_t das1800_interrupt(int irq, void *d); 192static int das1800_ai_poll(struct comedi_device *dev, 193 struct comedi_subdevice *s); 194static void das1800_ai_handler(struct comedi_device *dev); 195static void das1800_handle_dma(struct comedi_device *dev, 196 struct comedi_subdevice *s, unsigned int status); 197static void das1800_flush_dma(struct comedi_device *dev, 198 struct comedi_subdevice *s); 199static void das1800_flush_dma_channel(struct comedi_device *dev, 200 struct comedi_subdevice *s, 201 unsigned int channel, uint16_t * buffer); 202static void das1800_handle_fifo_half_full(struct comedi_device *dev, 203 struct comedi_subdevice *s); 204static void das1800_handle_fifo_not_empty(struct comedi_device *dev, 205 struct comedi_subdevice *s); 206static int das1800_ai_do_cmdtest(struct comedi_device *dev, 207 struct comedi_subdevice *s, 208 struct comedi_cmd *cmd); 209static int das1800_ai_do_cmd(struct comedi_device *dev, 210 struct comedi_subdevice *s); 211static int das1800_ai_rinsn(struct comedi_device *dev, 212 struct comedi_subdevice *s, 213 struct comedi_insn *insn, unsigned int *data); 214static int das1800_ao_winsn(struct comedi_device *dev, 215 struct comedi_subdevice *s, 216 struct comedi_insn *insn, unsigned int *data); 217static int das1800_di_rbits(struct comedi_device *dev, 218 struct comedi_subdevice *s, 219 struct comedi_insn *insn, unsigned int *data); 220static int das1800_do_wbits(struct comedi_device *dev, 221 struct comedi_subdevice *s, 222 struct comedi_insn *insn, unsigned int *data); 223 224static int das1800_set_frequency(struct comedi_device *dev); 225static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode); 226static unsigned int suggest_transfer_size(struct comedi_cmd *cmd); 227 228/* analog input ranges */ 229static const struct comedi_lrange range_ai_das1801 = { 230 8, 231 { 232 RANGE(-5, 5), 233 RANGE(-1, 1), 234 RANGE(-0.1, 0.1), 235 RANGE(-0.02, 0.02), 236 RANGE(0, 5), 237 RANGE(0, 1), 238 RANGE(0, 0.1), 239 RANGE(0, 0.02), 240 } 241}; 242 243static const struct comedi_lrange range_ai_das1802 = { 244 8, 245 { 246 RANGE(-10, 10), 247 RANGE(-5, 5), 248 RANGE(-2.5, 2.5), 249 RANGE(-1.25, 1.25), 250 RANGE(0, 10), 251 RANGE(0, 5), 252 RANGE(0, 2.5), 253 RANGE(0, 1.25), 254 } 255}; 256 257struct das1800_board { 258 const char *name; 259 int ai_speed; /* max conversion period in nanoseconds */ 260 int resolution; /* bits of ai resolution */ 261 int qram_len; /* length of card's channel / gain queue */ 262 int common; /* supports AREF_COMMON flag */ 263 int do_n_chan; /* number of digital output channels */ 264 int ao_ability; /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */ 265 int ao_n_chan; /* number of analog out channels */ 266 const struct comedi_lrange *range_ai; /* available input ranges */ 267}; 268 269/* Warning: the maximum conversion speeds listed below are 270 * not always achievable depending on board setup (see 271 * user manual.) 272 */ 273static const struct das1800_board das1800_boards[] = { 274 { 275 .name = "das-1701st", 276 .ai_speed = 6250, 277 .resolution = 12, 278 .qram_len = 256, 279 .common = 1, 280 .do_n_chan = 4, 281 .ao_ability = 0, 282 .ao_n_chan = 0, 283 .range_ai = &range_ai_das1801, 284 }, 285 { 286 .name = "das-1701st-da", 287 .ai_speed = 6250, 288 .resolution = 12, 289 .qram_len = 256, 290 .common = 1, 291 .do_n_chan = 4, 292 .ao_ability = 1, 293 .ao_n_chan = 4, 294 .range_ai = &range_ai_das1801, 295 }, 296 { 297 .name = "das-1702st", 298 .ai_speed = 6250, 299 .resolution = 12, 300 .qram_len = 256, 301 .common = 1, 302 .do_n_chan = 4, 303 .ao_ability = 0, 304 .ao_n_chan = 0, 305 .range_ai = &range_ai_das1802, 306 }, 307 { 308 .name = "das-1702st-da", 309 .ai_speed = 6250, 310 .resolution = 12, 311 .qram_len = 256, 312 .common = 1, 313 .do_n_chan = 4, 314 .ao_ability = 1, 315 .ao_n_chan = 4, 316 .range_ai = &range_ai_das1802, 317 }, 318 { 319 .name = "das-1702hr", 320 .ai_speed = 20000, 321 .resolution = 16, 322 .qram_len = 256, 323 .common = 1, 324 .do_n_chan = 4, 325 .ao_ability = 0, 326 .ao_n_chan = 0, 327 .range_ai = &range_ai_das1802, 328 }, 329 { 330 .name = "das-1702hr-da", 331 .ai_speed = 20000, 332 .resolution = 16, 333 .qram_len = 256, 334 .common = 1, 335 .do_n_chan = 4, 336 .ao_ability = 1, 337 .ao_n_chan = 2, 338 .range_ai = &range_ai_das1802, 339 }, 340 { 341 .name = "das-1701ao", 342 .ai_speed = 6250, 343 .resolution = 12, 344 .qram_len = 256, 345 .common = 1, 346 .do_n_chan = 4, 347 .ao_ability = 2, 348 .ao_n_chan = 2, 349 .range_ai = &range_ai_das1801, 350 }, 351 { 352 .name = "das-1702ao", 353 .ai_speed = 6250, 354 .resolution = 12, 355 .qram_len = 256, 356 .common = 1, 357 .do_n_chan = 4, 358 .ao_ability = 2, 359 .ao_n_chan = 2, 360 .range_ai = &range_ai_das1802, 361 }, 362 { 363 .name = "das-1801st", 364 .ai_speed = 3000, 365 .resolution = 12, 366 .qram_len = 256, 367 .common = 1, 368 .do_n_chan = 4, 369 .ao_ability = 0, 370 .ao_n_chan = 0, 371 .range_ai = &range_ai_das1801, 372 }, 373 { 374 .name = "das-1801st-da", 375 .ai_speed = 3000, 376 .resolution = 12, 377 .qram_len = 256, 378 .common = 1, 379 .do_n_chan = 4, 380 .ao_ability = 0, 381 .ao_n_chan = 4, 382 .range_ai = &range_ai_das1801, 383 }, 384 { 385 .name = "das-1802st", 386 .ai_speed = 3000, 387 .resolution = 12, 388 .qram_len = 256, 389 .common = 1, 390 .do_n_chan = 4, 391 .ao_ability = 0, 392 .ao_n_chan = 0, 393 .range_ai = &range_ai_das1802, 394 }, 395 { 396 .name = "das-1802st-da", 397 .ai_speed = 3000, 398 .resolution = 12, 399 .qram_len = 256, 400 .common = 1, 401 .do_n_chan = 4, 402 .ao_ability = 1, 403 .ao_n_chan = 4, 404 .range_ai = &range_ai_das1802, 405 }, 406 { 407 .name = "das-1802hr", 408 .ai_speed = 10000, 409 .resolution = 16, 410 .qram_len = 256, 411 .common = 1, 412 .do_n_chan = 4, 413 .ao_ability = 0, 414 .ao_n_chan = 0, 415 .range_ai = &range_ai_das1802, 416 }, 417 { 418 .name = "das-1802hr-da", 419 .ai_speed = 10000, 420 .resolution = 16, 421 .qram_len = 256, 422 .common = 1, 423 .do_n_chan = 4, 424 .ao_ability = 1, 425 .ao_n_chan = 2, 426 .range_ai = &range_ai_das1802, 427 }, 428 { 429 .name = "das-1801hc", 430 .ai_speed = 3000, 431 .resolution = 12, 432 .qram_len = 64, 433 .common = 0, 434 .do_n_chan = 8, 435 .ao_ability = 1, 436 .ao_n_chan = 2, 437 .range_ai = &range_ai_das1801, 438 }, 439 { 440 .name = "das-1802hc", 441 .ai_speed = 3000, 442 .resolution = 12, 443 .qram_len = 64, 444 .common = 0, 445 .do_n_chan = 8, 446 .ao_ability = 1, 447 .ao_n_chan = 2, 448 .range_ai = &range_ai_das1802, 449 }, 450 { 451 .name = "das-1801ao", 452 .ai_speed = 3000, 453 .resolution = 12, 454 .qram_len = 256, 455 .common = 1, 456 .do_n_chan = 4, 457 .ao_ability = 2, 458 .ao_n_chan = 2, 459 .range_ai = &range_ai_das1801, 460 }, 461 { 462 .name = "das-1802ao", 463 .ai_speed = 3000, 464 .resolution = 12, 465 .qram_len = 256, 466 .common = 1, 467 .do_n_chan = 4, 468 .ao_ability = 2, 469 .ao_n_chan = 2, 470 .range_ai = &range_ai_das1802, 471 }, 472}; 473 474/* 475 * Useful for shorthand access to the particular board structure 476 */ 477#define thisboard ((const struct das1800_board *)dev->board_ptr) 478 479struct das1800_private { 480 volatile unsigned int count; /* number of data points left to be taken */ 481 unsigned int divisor1; /* value to load into board's counter 1 for timed conversions */ 482 unsigned int divisor2; /* value to load into board's counter 2 for timed conversions */ 483 int do_bits; /* digital output bits */ 484 int irq_dma_bits; /* bits for control register b */ 485 /* dma bits for control register b, stored so that dma can be 486 * turned on and off */ 487 int dma_bits; 488 unsigned int dma0; /* dma channels used */ 489 unsigned int dma1; 490 volatile unsigned int dma_current; /* dma channel currently in use */ 491 uint16_t *ai_buf0; /* pointers to dma buffers */ 492 uint16_t *ai_buf1; 493 uint16_t *dma_current_buf; /* pointer to dma buffer currently being used */ 494 unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */ 495 unsigned long iobase2; /* secondary io address used for analog out on 'ao' boards */ 496 short ao_update_bits; /* remembers the last write to the 'update' dac */ 497}; 498 499#define devpriv ((struct das1800_private *)dev->private) 500 501/* analog out range for boards with basic analog out */ 502static const struct comedi_lrange range_ao_1 = { 503 1, 504 { 505 RANGE(-10, 10), 506 } 507}; 508 509/* analog out range for 'ao' boards */ 510/* 511static const struct comedi_lrange range_ao_2 = { 512 2, 513 { 514 RANGE(-10, 10), 515 RANGE(-5, 5), 516 } 517}; 518*/ 519 520static struct comedi_driver driver_das1800 = { 521 .driver_name = "das1800", 522 .module = THIS_MODULE, 523 .attach = das1800_attach, 524 .detach = das1800_detach, 525 .num_names = ARRAY_SIZE(das1800_boards), 526 .board_name = &das1800_boards[0].name, 527 .offset = sizeof(struct das1800_board), 528}; 529 530/* 531 * A convenient macro that defines init_module() and cleanup_module(), 532 * as necessary. 533 */ 534COMEDI_INITCLEANUP(driver_das1800); 535 536static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0, 537 unsigned int dma1) 538{ 539 unsigned long flags; 540 541 /* need an irq to do dma */ 542 if (dev->irq && dma0) { 543 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */ 544 switch ((dma0 & 0x7) | (dma1 << 4)) { 545 case 0x5: /* dma0 == 5 */ 546 devpriv->dma_bits |= DMA_CH5; 547 break; 548 case 0x6: /* dma0 == 6 */ 549 devpriv->dma_bits |= DMA_CH6; 550 break; 551 case 0x7: /* dma0 == 7 */ 552 devpriv->dma_bits |= DMA_CH7; 553 break; 554 case 0x65: /* dma0 == 5, dma1 == 6 */ 555 devpriv->dma_bits |= DMA_CH5_CH6; 556 break; 557 case 0x76: /* dma0 == 6, dma1 == 7 */ 558 devpriv->dma_bits |= DMA_CH6_CH7; 559 break; 560 case 0x57: /* dma0 == 7, dma1 == 5 */ 561 devpriv->dma_bits |= DMA_CH7_CH5; 562 break; 563 default: 564 printk(" only supports dma channels 5 through 7\n" 565 " Dual dma only allows the following combinations:\n" 566 " dma 5,6 / 6,7 / or 7,5\n"); 567 return -EINVAL; 568 break; 569 } 570 if (request_dma(dma0, driver_das1800.driver_name)) { 571 printk(" failed to allocate dma channel %i\n", dma0); 572 return -EINVAL; 573 } 574 devpriv->dma0 = dma0; 575 devpriv->dma_current = dma0; 576 if (dma1) { 577 if (request_dma(dma1, driver_das1800.driver_name)) { 578 printk(" failed to allocate dma channel %i\n", 579 dma1); 580 return -EINVAL; 581 } 582 devpriv->dma1 = dma1; 583 } 584 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA); 585 if (devpriv->ai_buf0 == NULL) 586 return -ENOMEM; 587 devpriv->dma_current_buf = devpriv->ai_buf0; 588 if (dma1) { 589 devpriv->ai_buf1 = 590 kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA); 591 if (devpriv->ai_buf1 == NULL) 592 return -ENOMEM; 593 } 594 flags = claim_dma_lock(); 595 disable_dma(devpriv->dma0); 596 set_dma_mode(devpriv->dma0, DMA_MODE_READ); 597 if (dma1) { 598 disable_dma(devpriv->dma1); 599 set_dma_mode(devpriv->dma1, DMA_MODE_READ); 600 } 601 release_dma_lock(flags); 602 } 603 return 0; 604} 605 606static int das1800_attach(struct comedi_device *dev, 607 struct comedi_devconfig *it) 608{ 609 struct comedi_subdevice *s; 610 unsigned long iobase = it->options[0]; 611 unsigned int irq = it->options[1]; 612 unsigned int dma0 = it->options[2]; 613 unsigned int dma1 = it->options[3]; 614 unsigned long iobase2; 615 int board; 616 int retval; 617 618 /* allocate and initialize dev->private */ 619 if (alloc_private(dev, sizeof(struct das1800_private)) < 0) 620 return -ENOMEM; 621 622 printk("comedi%d: %s: io 0x%lx", dev->minor, driver_das1800.driver_name, 623 iobase); 624 if (irq) { 625 printk(", irq %u", irq); 626 if (dma0) { 627 printk(", dma %u", dma0); 628 if (dma1) 629 printk(" and %u", dma1); 630 } 631 } 632 printk("\n"); 633 634 if (iobase == 0) { 635 printk(" io base address required\n"); 636 return -EINVAL; 637 } 638 639 /* check if io addresses are available */ 640 if (!request_region(iobase, DAS1800_SIZE, driver_das1800.driver_name)) { 641 printk 642 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", 643 iobase, iobase + DAS1800_SIZE - 1); 644 return -EIO; 645 } 646 dev->iobase = iobase; 647 648 board = das1800_probe(dev); 649 if (board < 0) { 650 printk(" unable to determine board type\n"); 651 return -ENODEV; 652 } 653 654 dev->board_ptr = das1800_boards + board; 655 dev->board_name = thisboard->name; 656 657 /* if it is an 'ao' board with fancy analog out then we need extra io ports */ 658 if (thisboard->ao_ability == 2) { 659 iobase2 = iobase + IOBASE2; 660 if (!request_region(iobase2, DAS1800_SIZE, 661 driver_das1800.driver_name)) { 662 printk 663 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", 664 iobase2, iobase2 + DAS1800_SIZE - 1); 665 return -EIO; 666 } 667 devpriv->iobase2 = iobase2; 668 } 669 670 /* grab our IRQ */ 671 if (irq) { 672 if (request_irq(irq, das1800_interrupt, 0, 673 driver_das1800.driver_name, dev)) { 674 printk(" unable to allocate irq %u\n", irq); 675 return -EINVAL; 676 } 677 } 678 dev->irq = irq; 679 680 /* set bits that tell card which irq to use */ 681 switch (irq) { 682 case 0: 683 break; 684 case 3: 685 devpriv->irq_dma_bits |= 0x8; 686 break; 687 case 5: 688 devpriv->irq_dma_bits |= 0x10; 689 break; 690 case 7: 691 devpriv->irq_dma_bits |= 0x18; 692 break; 693 case 10: 694 devpriv->irq_dma_bits |= 0x28; 695 break; 696 case 11: 697 devpriv->irq_dma_bits |= 0x30; 698 break; 699 case 15: 700 devpriv->irq_dma_bits |= 0x38; 701 break; 702 default: 703 printk(" irq out of range\n"); 704 return -EINVAL; 705 break; 706 } 707 708 retval = das1800_init_dma(dev, dma0, dma1); 709 if (retval < 0) 710 return retval; 711 712 if (devpriv->ai_buf0 == NULL) { 713 devpriv->ai_buf0 = 714 kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL); 715 if (devpriv->ai_buf0 == NULL) 716 return -ENOMEM; 717 } 718 719 if (alloc_subdevices(dev, 4) < 0) 720 return -ENOMEM; 721 722 /* analog input subdevice */ 723 s = dev->subdevices + 0; 724 dev->read_subdev = s; 725 s->type = COMEDI_SUBD_AI; 726 s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ; 727 if (thisboard->common) 728 s->subdev_flags |= SDF_COMMON; 729 s->n_chan = thisboard->qram_len; 730 s->len_chanlist = thisboard->qram_len; 731 s->maxdata = (1 << thisboard->resolution) - 1; 732 s->range_table = thisboard->range_ai; 733 s->do_cmd = das1800_ai_do_cmd; 734 s->do_cmdtest = das1800_ai_do_cmdtest; 735 s->insn_read = das1800_ai_rinsn; 736 s->poll = das1800_ai_poll; 737 s->cancel = das1800_cancel; 738 739 /* analog out */ 740 s = dev->subdevices + 1; 741 if (thisboard->ao_ability == 1) { 742 s->type = COMEDI_SUBD_AO; 743 s->subdev_flags = SDF_WRITABLE; 744 s->n_chan = thisboard->ao_n_chan; 745 s->maxdata = (1 << thisboard->resolution) - 1; 746 s->range_table = &range_ao_1; 747 s->insn_write = das1800_ao_winsn; 748 } else { 749 s->type = COMEDI_SUBD_UNUSED; 750 } 751 752 /* di */ 753 s = dev->subdevices + 2; 754 s->type = COMEDI_SUBD_DI; 755 s->subdev_flags = SDF_READABLE; 756 s->n_chan = 4; 757 s->maxdata = 1; 758 s->range_table = &range_digital; 759 s->insn_bits = das1800_di_rbits; 760 761 /* do */ 762 s = dev->subdevices + 3; 763 s->type = COMEDI_SUBD_DO; 764 s->subdev_flags = SDF_WRITABLE | SDF_READABLE; 765 s->n_chan = thisboard->do_n_chan; 766 s->maxdata = 1; 767 s->range_table = &range_digital; 768 s->insn_bits = das1800_do_wbits; 769 770 das1800_cancel(dev, dev->read_subdev); 771 772 /* initialize digital out channels */ 773 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL); 774 775 /* initialize analog out channels */ 776 if (thisboard->ao_ability == 1) { 777 /* select 'update' dac channel for baseAddress + 0x0 */ 778 outb(DAC(thisboard->ao_n_chan - 1), 779 dev->iobase + DAS1800_SELECT); 780 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC); 781 } 782 783 return 0; 784}; 785 786static int das1800_detach(struct comedi_device *dev) 787{ 788 /* only free stuff if it has been allocated by _attach */ 789 if (dev->iobase) 790 release_region(dev->iobase, DAS1800_SIZE); 791 if (dev->irq) 792 free_irq(dev->irq, dev); 793 if (dev->private) { 794 if (devpriv->iobase2) 795 release_region(devpriv->iobase2, DAS1800_SIZE); 796 if (devpriv->dma0) 797 free_dma(devpriv->dma0); 798 if (devpriv->dma1) 799 free_dma(devpriv->dma1); 800 if (devpriv->ai_buf0) 801 kfree(devpriv->ai_buf0); 802 if (devpriv->ai_buf1) 803 kfree(devpriv->ai_buf1); 804 } 805 806 printk("comedi%d: %s: remove\n", dev->minor, 807 driver_das1800.driver_name); 808 809 return 0; 810}; 811 812/* probes and checks das-1800 series board type 813 */ 814static int das1800_probe(struct comedi_device *dev) 815{ 816 int id; 817 int board; 818 819 id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */ 820 board = ((struct das1800_board *)dev->board_ptr) - das1800_boards; 821 822 switch (id) { 823 case 0x3: 824 if (board == das1801st_da || board == das1802st_da || 825 board == das1701st_da || board == das1702st_da) { 826 printk(" Board model: %s\n", 827 das1800_boards[board].name); 828 return board; 829 } 830 printk 831 (" Board model (probed, not recommended): das-1800st-da series\n"); 832 return das1801st; 833 break; 834 case 0x4: 835 if (board == das1802hr_da || board == das1702hr_da) { 836 printk(" Board model: %s\n", 837 das1800_boards[board].name); 838 return board; 839 } 840 printk 841 (" Board model (probed, not recommended): das-1802hr-da\n"); 842 return das1802hr; 843 break; 844 case 0x5: 845 if (board == das1801ao || board == das1802ao || 846 board == das1701ao || board == das1702ao) { 847 printk(" Board model: %s\n", 848 das1800_boards[board].name); 849 return board; 850 } 851 printk 852 (" Board model (probed, not recommended): das-1800ao series\n"); 853 return das1801ao; 854 break; 855 case 0x6: 856 if (board == das1802hr || board == das1702hr) { 857 printk(" Board model: %s\n", 858 das1800_boards[board].name); 859 return board; 860 } 861 printk(" Board model (probed, not recommended): das-1802hr\n"); 862 return das1802hr; 863 break; 864 case 0x7: 865 if (board == das1801st || board == das1802st || 866 board == das1701st || board == das1702st) { 867 printk(" Board model: %s\n", 868 das1800_boards[board].name); 869 return board; 870 } 871 printk 872 (" Board model (probed, not recommended): das-1800st series\n"); 873 return das1801st; 874 break; 875 case 0x8: 876 if (board == das1801hc || board == das1802hc) { 877 printk(" Board model: %s\n", 878 das1800_boards[board].name); 879 return board; 880 } 881 printk 882 (" Board model (probed, not recommended): das-1800hc series\n"); 883 return das1801hc; 884 break; 885 default: 886 printk 887 (" Board model: probe returned 0x%x (unknown, please report)\n", 888 id); 889 return board; 890 break; 891 } 892 return -1; 893} 894 895static int das1800_ai_poll(struct comedi_device *dev, 896 struct comedi_subdevice *s) 897{ 898 unsigned long flags; 899 900 /* prevent race with interrupt handler */ 901 spin_lock_irqsave(&dev->spinlock, flags); 902 das1800_ai_handler(dev); 903 spin_unlock_irqrestore(&dev->spinlock, flags); 904 905 return s->async->buf_write_count - s->async->buf_read_count; 906} 907 908static irqreturn_t das1800_interrupt(int irq, void *d) 909{ 910 struct comedi_device *dev = d; 911 unsigned int status; 912 913 if (dev->attached == 0) { 914 comedi_error(dev, "premature interrupt"); 915 return IRQ_HANDLED; 916 } 917 918 /* Prevent race with das1800_ai_poll() on multi processor systems. 919 * Also protects indirect addressing in das1800_ai_handler */ 920 spin_lock(&dev->spinlock); 921 status = inb(dev->iobase + DAS1800_STATUS); 922 923 /* if interrupt was not caused by das-1800 */ 924 if (!(status & INT)) { 925 spin_unlock(&dev->spinlock); 926 return IRQ_NONE; 927 } 928 /* clear the interrupt status bit INT */ 929 outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS); 930 /* handle interrupt */ 931 das1800_ai_handler(dev); 932 933 spin_unlock(&dev->spinlock); 934 return IRQ_HANDLED; 935} 936 937/* the guts of the interrupt handler, that is shared with das1800_ai_poll */ 938static void das1800_ai_handler(struct comedi_device *dev) 939{ 940 struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */ 941 struct comedi_async *async = s->async; 942 struct comedi_cmd *cmd = &async->cmd; 943 unsigned int status = inb(dev->iobase + DAS1800_STATUS); 944 945 async->events = 0; 946 /* select adc for base address + 0 */ 947 outb(ADC, dev->iobase + DAS1800_SELECT); 948 /* dma buffer full */ 949 if (devpriv->irq_dma_bits & DMA_ENABLED) { 950 /* look for data from dma transfer even if dma terminal count hasn't happened yet */ 951 das1800_handle_dma(dev, s, status); 952 } else if (status & FHF) { /* if fifo half full */ 953 das1800_handle_fifo_half_full(dev, s); 954 } else if (status & FNE) { /* if fifo not empty */ 955 das1800_handle_fifo_not_empty(dev, s); 956 } 957 958 async->events |= COMEDI_CB_BLOCK; 959 /* if the card's fifo has overflowed */ 960 if (status & OVF) { 961 /* clear OVF interrupt bit */ 962 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS); 963 comedi_error(dev, "DAS1800 FIFO overflow"); 964 das1800_cancel(dev, s); 965 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA; 966 comedi_event(dev, s); 967 return; 968 } 969 /* stop taking data if appropriate */ 970 /* stop_src TRIG_EXT */ 971 if (status & CT0TC) { 972 /* clear CT0TC interrupt bit */ 973 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS); 974 /* make sure we get all remaining data from board before quitting */ 975 if (devpriv->irq_dma_bits & DMA_ENABLED) 976 das1800_flush_dma(dev, s); 977 else 978 das1800_handle_fifo_not_empty(dev, s); 979 das1800_cancel(dev, s); /* disable hardware conversions */ 980 async->events |= COMEDI_CB_EOA; 981 } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */ 982 das1800_cancel(dev, s); /* disable hardware conversions */ 983 async->events |= COMEDI_CB_EOA; 984 } 985 986 comedi_event(dev, s); 987 988 return; 989} 990 991static void das1800_handle_dma(struct comedi_device *dev, 992 struct comedi_subdevice *s, unsigned int status) 993{ 994 unsigned long flags; 995 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 996 997 flags = claim_dma_lock(); 998 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 999 devpriv->dma_current_buf); 1000 /* re-enable dma channel */ 1001 set_dma_addr(devpriv->dma_current, 1002 virt_to_bus(devpriv->dma_current_buf)); 1003 set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size); 1004 enable_dma(devpriv->dma_current); 1005 release_dma_lock(flags); 1006 1007 if (status & DMATC) { 1008 /* clear DMATC interrupt bit */ 1009 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS); 1010 /* switch dma channels for next time, if appropriate */ 1011 if (dual_dma) { 1012 /* read data from the other channel next time */ 1013 if (devpriv->dma_current == devpriv->dma0) { 1014 devpriv->dma_current = devpriv->dma1; 1015 devpriv->dma_current_buf = devpriv->ai_buf1; 1016 } else { 1017 devpriv->dma_current = devpriv->dma0; 1018 devpriv->dma_current_buf = devpriv->ai_buf0; 1019 } 1020 } 1021 } 1022 1023 return; 1024} 1025 1026static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev, 1027 uint16_t sample) 1028{ 1029 sample += 1 << (thisboard->resolution - 1); 1030 return sample; 1031} 1032 1033static void munge_data(struct comedi_device *dev, uint16_t * array, 1034 unsigned int num_elements) 1035{ 1036 unsigned int i; 1037 int unipolar; 1038 1039 /* see if card is using a unipolar or bipolar range so we can munge data correctly */ 1040 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB; 1041 1042 /* convert to unsigned type if we are in a bipolar mode */ 1043 if (!unipolar) { 1044 for (i = 0; i < num_elements; i++) { 1045 array[i] = munge_bipolar_sample(dev, array[i]); 1046 } 1047 } 1048} 1049 1050/* Utility function used by das1800_flush_dma() and das1800_handle_dma(). 1051 * Assumes dma lock is held */ 1052static void das1800_flush_dma_channel(struct comedi_device *dev, 1053 struct comedi_subdevice *s, 1054 unsigned int channel, uint16_t * buffer) 1055{ 1056 unsigned int num_bytes, num_samples; 1057 struct comedi_cmd *cmd = &s->async->cmd; 1058 1059 disable_dma(channel); 1060 1061 /* clear flip-flop to make sure 2-byte registers 1062 * get set correctly */ 1063 clear_dma_ff(channel); 1064 1065 /* figure out how many points to read */ 1066 num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel); 1067 num_samples = num_bytes / sizeof(short); 1068 1069 /* if we only need some of the points */ 1070 if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples) 1071 num_samples = devpriv->count; 1072 1073 munge_data(dev, buffer, num_samples); 1074 cfc_write_array_to_buffer(s, buffer, num_bytes); 1075 if (s->async->cmd.stop_src == TRIG_COUNT) 1076 devpriv->count -= num_samples; 1077 1078 return; 1079} 1080 1081/* flushes remaining data from board when external trigger has stopped aquisition 1082 * and we are using dma transfers */ 1083static void das1800_flush_dma(struct comedi_device *dev, 1084 struct comedi_subdevice *s) 1085{ 1086 unsigned long flags; 1087 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 1088 1089 flags = claim_dma_lock(); 1090 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 1091 devpriv->dma_current_buf); 1092 1093 if (dual_dma) { 1094 /* switch to other channel and flush it */ 1095 if (devpriv->dma_current == devpriv->dma0) { 1096 devpriv->dma_current = devpriv->dma1; 1097 devpriv->dma_current_buf = devpriv->ai_buf1; 1098 } else { 1099 devpriv->dma_current = devpriv->dma0; 1100 devpriv->dma_current_buf = devpriv->ai_buf0; 1101 } 1102 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 1103 devpriv->dma_current_buf); 1104 } 1105 1106 release_dma_lock(flags); 1107 1108 /* get any remaining samples in fifo */ 1109 das1800_handle_fifo_not_empty(dev, s); 1110 1111 return; 1112} 1113 1114static void das1800_handle_fifo_half_full(struct comedi_device *dev, 1115 struct comedi_subdevice *s) 1116{ 1117 int numPoints = 0; /* number of points to read */ 1118 struct comedi_cmd *cmd = &s->async->cmd; 1119 1120 numPoints = FIFO_SIZE / 2; 1121 /* if we only need some of the points */ 1122 if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints) 1123 numPoints = devpriv->count; 1124 insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints); 1125 munge_data(dev, devpriv->ai_buf0, numPoints); 1126 cfc_write_array_to_buffer(s, devpriv->ai_buf0, 1127 numPoints * sizeof(devpriv->ai_buf0[0])); 1128 if (cmd->stop_src == TRIG_COUNT) 1129 devpriv->count -= numPoints; 1130 return; 1131} 1132 1133static void das1800_handle_fifo_not_empty(struct comedi_device *dev, 1134 struct comedi_subdevice *s) 1135{ 1136 short dpnt; 1137 int unipolar; 1138 struct comedi_cmd *cmd = &s->async->cmd; 1139 1140 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB; 1141 1142 while (inb(dev->iobase + DAS1800_STATUS) & FNE) { 1143 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) 1144 break; 1145 dpnt = inw(dev->iobase + DAS1800_FIFO); 1146 /* convert to unsigned type if we are in a bipolar mode */ 1147 if (!unipolar) ; 1148 dpnt = munge_bipolar_sample(dev, dpnt); 1149 cfc_write_to_buffer(s, dpnt); 1150 if (cmd->stop_src == TRIG_COUNT) 1151 devpriv->count--; 1152 } 1153 1154 return; 1155} 1156 1157static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 1158{ 1159 outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */ 1160 outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */ 1161 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */ 1162 if (devpriv->dma0) 1163 disable_dma(devpriv->dma0); 1164 if (devpriv->dma1) 1165 disable_dma(devpriv->dma1); 1166 return 0; 1167} 1168 1169/* test analog input cmd */ 1170static int das1800_ai_do_cmdtest(struct comedi_device *dev, 1171 struct comedi_subdevice *s, 1172 struct comedi_cmd *cmd) 1173{ 1174 int err = 0; 1175 int tmp; 1176 unsigned int tmp_arg; 1177 int i; 1178 int unipolar; 1179 1180 /* step 1: make sure trigger sources are trivially valid */ 1181 1182 tmp = cmd->start_src; 1183 cmd->start_src &= TRIG_NOW | TRIG_EXT; 1184 if (!cmd->start_src || tmp != cmd->start_src) 1185 err++; 1186 1187 tmp = cmd->scan_begin_src; 1188 cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT; 1189 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src) 1190 err++; 1191 1192 tmp = cmd->convert_src; 1193 cmd->convert_src &= TRIG_TIMER | TRIG_EXT; 1194 if (!cmd->convert_src || tmp != cmd->convert_src) 1195 err++; 1196 1197 tmp = cmd->scan_end_src; 1198 cmd->scan_end_src &= TRIG_COUNT; 1199 if (!cmd->scan_end_src || tmp != cmd->scan_end_src) 1200 err++; 1201 1202 tmp = cmd->stop_src; 1203 cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE; 1204 if (!cmd->stop_src || tmp != cmd->stop_src) 1205 err++; 1206 1207 if (err) 1208 return 1; 1209 1210 /* step 2: make sure trigger sources are unique and mutually compatible */ 1211 1212 /* uniqueness check */ 1213 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT) 1214 err++; 1215 if (cmd->scan_begin_src != TRIG_FOLLOW && 1216 cmd->scan_begin_src != TRIG_TIMER && 1217 cmd->scan_begin_src != TRIG_EXT) 1218 err++; 1219 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT) 1220 err++; 1221 if (cmd->stop_src != TRIG_COUNT && 1222 cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT) 1223 err++; 1224 /* compatibility check */ 1225 if (cmd->scan_begin_src != TRIG_FOLLOW && 1226 cmd->convert_src != TRIG_TIMER) 1227 err++; 1228 1229 if (err) 1230 return 2; 1231 1232 /* step 3: make sure arguments are trivially compatible */ 1233 1234 if (cmd->start_arg != 0) { 1235 cmd->start_arg = 0; 1236 err++; 1237 } 1238 if (cmd->convert_src == TRIG_TIMER) { 1239 if (cmd->convert_arg < thisboard->ai_speed) { 1240 cmd->convert_arg = thisboard->ai_speed; 1241 err++; 1242 } 1243 } 1244 if (!cmd->chanlist_len) { 1245 cmd->chanlist_len = 1; 1246 err++; 1247 } 1248 if (cmd->scan_end_arg != cmd->chanlist_len) { 1249 cmd->scan_end_arg = cmd->chanlist_len; 1250 err++; 1251 } 1252 1253 switch (cmd->stop_src) { 1254 case TRIG_COUNT: 1255 if (!cmd->stop_arg) { 1256 cmd->stop_arg = 1; 1257 err++; 1258 } 1259 break; 1260 case TRIG_NONE: 1261 if (cmd->stop_arg != 0) { 1262 cmd->stop_arg = 0; 1263 err++; 1264 } 1265 break; 1266 default: 1267 break; 1268 } 1269 1270 if (err) 1271 return 3; 1272 1273 /* step 4: fix up any arguments */ 1274 1275 if (cmd->convert_src == TRIG_TIMER) { 1276 /* if we are not in burst mode */ 1277 if (cmd->scan_begin_src == TRIG_FOLLOW) { 1278 tmp_arg = cmd->convert_arg; 1279 /* calculate counter values that give desired timing */ 1280 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 1281 &(devpriv->divisor1), 1282 &(devpriv->divisor2), 1283 &(cmd->convert_arg), 1284 cmd-> 1285 flags & TRIG_ROUND_MASK); 1286 if (tmp_arg != cmd->convert_arg) 1287 err++; 1288 } 1289 /* if we are in burst mode */ 1290 else { 1291 /* check that convert_arg is compatible */ 1292 tmp_arg = cmd->convert_arg; 1293 cmd->convert_arg = 1294 burst_convert_arg(cmd->convert_arg, 1295 cmd->flags & TRIG_ROUND_MASK); 1296 if (tmp_arg != cmd->convert_arg) 1297 err++; 1298 1299 if (cmd->scan_begin_src == TRIG_TIMER) { 1300 /* if scans are timed faster than conversion rate allows */ 1301 if (cmd->convert_arg * cmd->chanlist_len > 1302 cmd->scan_begin_arg) { 1303 cmd->scan_begin_arg = 1304 cmd->convert_arg * 1305 cmd->chanlist_len; 1306 err++; 1307 } 1308 tmp_arg = cmd->scan_begin_arg; 1309 /* calculate counter values that give desired timing */ 1310 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 1311 &(devpriv-> 1312 divisor1), 1313 &(devpriv-> 1314 divisor2), 1315 &(cmd-> 1316 scan_begin_arg), 1317 cmd-> 1318 flags & 1319 TRIG_ROUND_MASK); 1320 if (tmp_arg != cmd->scan_begin_arg) 1321 err++; 1322 } 1323 } 1324 } 1325 1326 if (err) 1327 return 4; 1328 1329 /* make sure user is not trying to mix unipolar and bipolar ranges */ 1330 if (cmd->chanlist) { 1331 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR; 1332 for (i = 1; i < cmd->chanlist_len; i++) { 1333 if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) { 1334 comedi_error(dev, 1335 "unipolar and bipolar ranges cannot be mixed in the chanlist"); 1336 err++; 1337 break; 1338 } 1339 } 1340 } 1341 1342 if (err) 1343 return 5; 1344 1345 return 0; 1346} 1347 1348/* analog input cmd interface */ 1349 1350/* first, some utility functions used in the main ai_do_cmd() */ 1351 1352/* returns appropriate bits for control register a, depending on command */ 1353static int control_a_bits(struct comedi_cmd cmd) 1354{ 1355 int control_a; 1356 1357 control_a = FFEN; /* enable fifo */ 1358 if (cmd.stop_src == TRIG_EXT) { 1359 control_a |= ATEN; 1360 } 1361 switch (cmd.start_src) { 1362 case TRIG_EXT: 1363 control_a |= TGEN | CGSL; 1364 break; 1365 case TRIG_NOW: 1366 control_a |= CGEN; 1367 break; 1368 default: 1369 break; 1370 } 1371 1372 return control_a; 1373} 1374 1375/* returns appropriate bits for control register c, depending on command */ 1376static int control_c_bits(struct comedi_cmd cmd) 1377{ 1378 int control_c; 1379 int aref; 1380 1381 /* set clock source to internal or external, select analog reference, 1382 * select unipolar / bipolar 1383 */ 1384 aref = CR_AREF(cmd.chanlist[0]); 1385 control_c = UQEN; /* enable upper qram addresses */ 1386 if (aref != AREF_DIFF) 1387 control_c |= SD; 1388 if (aref == AREF_COMMON) 1389 control_c |= CMEN; 1390 /* if a unipolar range was selected */ 1391 if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR) 1392 control_c |= UB; 1393 switch (cmd.scan_begin_src) { 1394 case TRIG_FOLLOW: /* not in burst mode */ 1395 switch (cmd.convert_src) { 1396 case TRIG_TIMER: 1397 /* trig on cascaded counters */ 1398 control_c |= IPCLK; 1399 break; 1400 case TRIG_EXT: 1401 /* trig on falling edge of external trigger */ 1402 control_c |= XPCLK; 1403 break; 1404 default: 1405 break; 1406 } 1407 break; 1408 case TRIG_TIMER: 1409 /* burst mode with internal pacer clock */ 1410 control_c |= BMDE | IPCLK; 1411 break; 1412 case TRIG_EXT: 1413 /* burst mode with external trigger */ 1414 control_c |= BMDE | XPCLK; 1415 break; 1416 default: 1417 break; 1418 } 1419 1420 return control_c; 1421} 1422 1423/* sets up counters */ 1424static int setup_counters(struct comedi_device *dev, struct comedi_cmd cmd) 1425{ 1426 /* setup cascaded counters for conversion/scan frequency */ 1427 switch (cmd.scan_begin_src) { 1428 case TRIG_FOLLOW: /* not in burst mode */ 1429 if (cmd.convert_src == TRIG_TIMER) { 1430 /* set conversion frequency */ 1431 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 1432 &(devpriv->divisor1), 1433 &(devpriv->divisor2), 1434 &(cmd.convert_arg), 1435 cmd. 1436 flags & TRIG_ROUND_MASK); 1437 if (das1800_set_frequency(dev) < 0) { 1438 return -1; 1439 } 1440 } 1441 break; 1442 case TRIG_TIMER: /* in burst mode */ 1443 /* set scan frequency */ 1444 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1), 1445 &(devpriv->divisor2), 1446 &(cmd.scan_begin_arg), 1447 cmd.flags & TRIG_ROUND_MASK); 1448 if (das1800_set_frequency(dev) < 0) { 1449 return -1; 1450 } 1451 break; 1452 default: 1453 break; 1454 } 1455 1456 /* setup counter 0 for 'about triggering' */ 1457 if (cmd.stop_src == TRIG_EXT) { 1458 /* load counter 0 in mode 0 */ 1459 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0); 1460 } 1461 1462 return 0; 1463} 1464 1465/* sets up dma */ 1466static void setup_dma(struct comedi_device *dev, struct comedi_cmd cmd) 1467{ 1468 unsigned long lock_flags; 1469 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 1470 1471 if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0) 1472 return; 1473 1474 /* determine a reasonable dma transfer size */ 1475 devpriv->dma_transfer_size = suggest_transfer_size(&cmd); 1476 lock_flags = claim_dma_lock(); 1477 disable_dma(devpriv->dma0); 1478 /* clear flip-flop to make sure 2-byte registers for 1479 * count and address get set correctly */ 1480 clear_dma_ff(devpriv->dma0); 1481 set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0)); 1482 /* set appropriate size of transfer */ 1483 set_dma_count(devpriv->dma0, devpriv->dma_transfer_size); 1484 devpriv->dma_current = devpriv->dma0; 1485 devpriv->dma_current_buf = devpriv->ai_buf0; 1486 enable_dma(devpriv->dma0); 1487 /* set up dual dma if appropriate */ 1488 if (dual_dma) { 1489 disable_dma(devpriv->dma1); 1490 /* clear flip-flop to make sure 2-byte registers for 1491 * count and address get set correctly */ 1492 clear_dma_ff(devpriv->dma1); 1493 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1)); 1494 /* set appropriate size of transfer */ 1495 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size); 1496 enable_dma(devpriv->dma1); 1497 } 1498 release_dma_lock(lock_flags); 1499 1500 return; 1501} 1502 1503/* programs channel/gain list into card */ 1504static void program_chanlist(struct comedi_device *dev, struct comedi_cmd cmd) 1505{ 1506 int i, n, chan_range; 1507 unsigned long irq_flags; 1508 const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */ 1509 const int range_bitshift = 8; 1510 1511 n = cmd.chanlist_len; 1512 /* spinlock protects indirect addressing */ 1513 spin_lock_irqsave(&dev->spinlock, irq_flags); 1514 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */ 1515 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */ 1516 /* make channel / gain list */ 1517 for (i = 0; i < n; i++) { 1518 chan_range = 1519 CR_CHAN(cmd. 1520 chanlist[i]) | ((CR_RANGE(cmd.chanlist[i]) & 1521 range_mask) << range_bitshift); 1522 outw(chan_range, dev->iobase + DAS1800_QRAM); 1523 } 1524 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */ 1525 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1526 1527 return; 1528} 1529 1530/* analog input do_cmd */ 1531static int das1800_ai_do_cmd(struct comedi_device *dev, 1532 struct comedi_subdevice *s) 1533{ 1534 int ret; 1535 int control_a, control_c; 1536 struct comedi_async *async = s->async; 1537 struct comedi_cmd cmd = async->cmd; 1538 1539 if (!dev->irq) { 1540 comedi_error(dev, 1541 "no irq assigned for das-1800, cannot do hardware conversions"); 1542 return -1; 1543 } 1544 1545 /* disable dma on TRIG_WAKE_EOS, or TRIG_RT 1546 * (because dma in handler is unsafe at hard real-time priority) */ 1547 if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT)) { 1548 devpriv->irq_dma_bits &= ~DMA_ENABLED; 1549 } else { 1550 devpriv->irq_dma_bits |= devpriv->dma_bits; 1551 } 1552 /* interrupt on end of conversion for TRIG_WAKE_EOS */ 1553 if (cmd.flags & TRIG_WAKE_EOS) { 1554 /* interrupt fifo not empty */ 1555 devpriv->irq_dma_bits &= ~FIMD; 1556 } else { 1557 /* interrupt fifo half full */ 1558 devpriv->irq_dma_bits |= FIMD; 1559 } 1560 /* determine how many conversions we need */ 1561 if (cmd.stop_src == TRIG_COUNT) { 1562 devpriv->count = cmd.stop_arg * cmd.chanlist_len; 1563 } 1564 1565 das1800_cancel(dev, s); 1566 1567 /* determine proper bits for control registers */ 1568 control_a = control_a_bits(cmd); 1569 control_c = control_c_bits(cmd); 1570 1571 /* setup card and start */ 1572 program_chanlist(dev, cmd); 1573 ret = setup_counters(dev, cmd); 1574 if (ret < 0) { 1575 comedi_error(dev, "Error setting up counters"); 1576 return ret; 1577 } 1578 setup_dma(dev, cmd); 1579 outb(control_c, dev->iobase + DAS1800_CONTROL_C); 1580 /* set conversion rate and length for burst mode */ 1581 if (control_c & BMDE) { 1582 /* program conversion period with number of microseconds minus 1 */ 1583 outb(cmd.convert_arg / 1000 - 1, 1584 dev->iobase + DAS1800_BURST_RATE); 1585 outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH); 1586 } 1587 outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */ 1588 outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */ 1589 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */ 1590 1591 return 0; 1592} 1593 1594/* read analog input */ 1595static int das1800_ai_rinsn(struct comedi_device *dev, 1596 struct comedi_subdevice *s, 1597 struct comedi_insn *insn, unsigned int *data) 1598{ 1599 int i, n; 1600 int chan, range, aref, chan_range; 1601 int timeout = 1000; 1602 short dpnt; 1603 int conv_flags = 0; 1604 unsigned long irq_flags; 1605 1606 /* set up analog reference and unipolar / bipolar mode */ 1607 aref = CR_AREF(insn->chanspec); 1608 conv_flags |= UQEN; 1609 if (aref != AREF_DIFF) 1610 conv_flags |= SD; 1611 if (aref == AREF_COMMON) 1612 conv_flags |= CMEN; 1613 /* if a unipolar range was selected */ 1614 if (CR_RANGE(insn->chanspec) & UNIPOLAR) 1615 conv_flags |= UB; 1616 1617 outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */ 1618 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */ 1619 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */ 1620 outb(FFEN, dev->iobase + DAS1800_CONTROL_A); 1621 1622 chan = CR_CHAN(insn->chanspec); 1623 /* mask of unipolar/bipolar bit from range */ 1624 range = CR_RANGE(insn->chanspec) & 0x3; 1625 chan_range = chan | (range << 8); 1626 spin_lock_irqsave(&dev->spinlock, irq_flags); 1627 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */ 1628 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */ 1629 outw(chan_range, dev->iobase + DAS1800_QRAM); 1630 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */ 1631 outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */ 1632 1633 for (n = 0; n < insn->n; n++) { 1634 /* trigger conversion */ 1635 outb(0, dev->iobase + DAS1800_FIFO); 1636 for (i = 0; i < timeout; i++) { 1637 if (inb(dev->iobase + DAS1800_STATUS) & FNE) 1638 break; 1639 } 1640 if (i == timeout) { 1641 comedi_error(dev, "timeout"); 1642 return -ETIME; 1643 } 1644 dpnt = inw(dev->iobase + DAS1800_FIFO); 1645 /* shift data to offset binary for bipolar ranges */ 1646 if ((conv_flags & UB) == 0) 1647 dpnt += 1 << (thisboard->resolution - 1); 1648 data[n] = dpnt; 1649 } 1650 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1651 1652 return n; 1653} 1654 1655/* writes to an analog output channel */ 1656static int das1800_ao_winsn(struct comedi_device *dev, 1657 struct comedi_subdevice *s, 1658 struct comedi_insn *insn, unsigned int *data) 1659{ 1660 int chan = CR_CHAN(insn->chanspec); 1661/* int range = CR_RANGE(insn->chanspec); */ 1662 int update_chan = thisboard->ao_n_chan - 1; 1663 short output; 1664 unsigned long irq_flags; 1665 1666 /* card expects two's complement data */ 1667 output = data[0] - (1 << (thisboard->resolution - 1)); 1668 /* if the write is to the 'update' channel, we need to remember its value */ 1669 if (chan == update_chan) 1670 devpriv->ao_update_bits = output; 1671 /* write to channel */ 1672 spin_lock_irqsave(&dev->spinlock, irq_flags); 1673 outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */ 1674 outw(output, dev->iobase + DAS1800_DAC); 1675 /* now we need to write to 'update' channel to update all dac channels */ 1676 if (chan != update_chan) { 1677 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */ 1678 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC); 1679 } 1680 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1681 1682 return 1; 1683} 1684 1685/* reads from digital input channels */ 1686static int das1800_di_rbits(struct comedi_device *dev, 1687 struct comedi_subdevice *s, 1688 struct comedi_insn *insn, unsigned int *data) 1689{ 1690 1691 data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf; 1692 data[0] = 0; 1693 1694 return 2; 1695} 1696 1697/* writes to digital output channels */ 1698static int das1800_do_wbits(struct comedi_device *dev, 1699 struct comedi_subdevice *s, 1700 struct comedi_insn *insn, unsigned int *data) 1701{ 1702 unsigned int wbits; 1703 1704 /* only set bits that have been masked */ 1705 data[0] &= (1 << s->n_chan) - 1; 1706 wbits = devpriv->do_bits; 1707 wbits &= ~data[0]; 1708 wbits |= data[0] & data[1]; 1709 devpriv->do_bits = wbits; 1710 1711 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL); 1712 1713 data[1] = devpriv->do_bits; 1714 1715 return 2; 1716} 1717 1718/* loads counters with divisor1, divisor2 from private structure */ 1719static int das1800_set_frequency(struct comedi_device *dev) 1720{ 1721 int err = 0; 1722 1723 /* counter 1, mode 2 */ 1724 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1, 1725 2)) 1726 err++; 1727 /* counter 2, mode 2 */ 1728 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2, 1729 2)) 1730 err++; 1731 if (err) 1732 return -1; 1733 1734 return 0; 1735} 1736 1737/* converts requested conversion timing to timing compatible with 1738 * hardware, used only when card is in 'burst mode' 1739 */ 1740static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode) 1741{ 1742 unsigned int micro_sec; 1743 1744 /* in burst mode, the maximum conversion time is 64 microseconds */ 1745 if (convert_arg > 64000) 1746 convert_arg = 64000; 1747 1748 /* the conversion time must be an integral number of microseconds */ 1749 switch (round_mode) { 1750 case TRIG_ROUND_NEAREST: 1751 default: 1752 micro_sec = (convert_arg + 500) / 1000; 1753 break; 1754 case TRIG_ROUND_DOWN: 1755 micro_sec = convert_arg / 1000; 1756 break; 1757 case TRIG_ROUND_UP: 1758 micro_sec = (convert_arg - 1) / 1000 + 1; 1759 break; 1760 } 1761 1762 /* return number of nanoseconds */ 1763 return micro_sec * 1000; 1764} 1765 1766/* utility function that suggests a dma transfer size based on the conversion period 'ns' */ 1767static unsigned int suggest_transfer_size(struct comedi_cmd *cmd) 1768{ 1769 unsigned int size = DMA_BUF_SIZE; 1770 static const int sample_size = 2; /* size in bytes of one sample from board */ 1771 unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */ 1772 unsigned int max_size; /* maximum size we will allow for a transfer */ 1773 1774 /* make dma buffer fill in 0.3 seconds for timed modes */ 1775 switch (cmd->scan_begin_src) { 1776 case TRIG_FOLLOW: /* not in burst mode */ 1777 if (cmd->convert_src == TRIG_TIMER) 1778 size = (fill_time / cmd->convert_arg) * sample_size; 1779 break; 1780 case TRIG_TIMER: 1781 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) * 1782 sample_size; 1783 break; 1784 default: 1785 size = DMA_BUF_SIZE; 1786 break; 1787 } 1788 1789 /* set a minimum and maximum size allowed */ 1790 max_size = DMA_BUF_SIZE; 1791 /* if we are taking limited number of conversions, limit transfer size to that */ 1792 if (cmd->stop_src == TRIG_COUNT && 1793 cmd->stop_arg * cmd->chanlist_len * sample_size < max_size) 1794 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size; 1795 1796 if (size > max_size) 1797 size = max_size; 1798 if (size < sample_size) 1799 size = sample_size; 1800 1801 return size; 1802} 1803