das1800.c revision 1bf2ee4ea19d3ebeb8fe35c03dd44cb1d851e19f
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 kfree(devpriv->ai_buf0); 801 kfree(devpriv->ai_buf1); 802 } 803 804 printk("comedi%d: %s: remove\n", dev->minor, 805 driver_das1800.driver_name); 806 807 return 0; 808}; 809 810/* probes and checks das-1800 series board type 811 */ 812static int das1800_probe(struct comedi_device *dev) 813{ 814 int id; 815 int board; 816 817 id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */ 818 board = ((struct das1800_board *)dev->board_ptr) - das1800_boards; 819 820 switch (id) { 821 case 0x3: 822 if (board == das1801st_da || board == das1802st_da || 823 board == das1701st_da || board == das1702st_da) { 824 printk(" Board model: %s\n", 825 das1800_boards[board].name); 826 return board; 827 } 828 printk 829 (" Board model (probed, not recommended): das-1800st-da series\n"); 830 return das1801st; 831 break; 832 case 0x4: 833 if (board == das1802hr_da || board == das1702hr_da) { 834 printk(" Board model: %s\n", 835 das1800_boards[board].name); 836 return board; 837 } 838 printk 839 (" Board model (probed, not recommended): das-1802hr-da\n"); 840 return das1802hr; 841 break; 842 case 0x5: 843 if (board == das1801ao || board == das1802ao || 844 board == das1701ao || board == das1702ao) { 845 printk(" Board model: %s\n", 846 das1800_boards[board].name); 847 return board; 848 } 849 printk 850 (" Board model (probed, not recommended): das-1800ao series\n"); 851 return das1801ao; 852 break; 853 case 0x6: 854 if (board == das1802hr || board == das1702hr) { 855 printk(" Board model: %s\n", 856 das1800_boards[board].name); 857 return board; 858 } 859 printk(" Board model (probed, not recommended): das-1802hr\n"); 860 return das1802hr; 861 break; 862 case 0x7: 863 if (board == das1801st || board == das1802st || 864 board == das1701st || board == das1702st) { 865 printk(" Board model: %s\n", 866 das1800_boards[board].name); 867 return board; 868 } 869 printk 870 (" Board model (probed, not recommended): das-1800st series\n"); 871 return das1801st; 872 break; 873 case 0x8: 874 if (board == das1801hc || board == das1802hc) { 875 printk(" Board model: %s\n", 876 das1800_boards[board].name); 877 return board; 878 } 879 printk 880 (" Board model (probed, not recommended): das-1800hc series\n"); 881 return das1801hc; 882 break; 883 default: 884 printk 885 (" Board model: probe returned 0x%x (unknown, please report)\n", 886 id); 887 return board; 888 break; 889 } 890 return -1; 891} 892 893static int das1800_ai_poll(struct comedi_device *dev, 894 struct comedi_subdevice *s) 895{ 896 unsigned long flags; 897 898 /* prevent race with interrupt handler */ 899 spin_lock_irqsave(&dev->spinlock, flags); 900 das1800_ai_handler(dev); 901 spin_unlock_irqrestore(&dev->spinlock, flags); 902 903 return s->async->buf_write_count - s->async->buf_read_count; 904} 905 906static irqreturn_t das1800_interrupt(int irq, void *d) 907{ 908 struct comedi_device *dev = d; 909 unsigned int status; 910 911 if (dev->attached == 0) { 912 comedi_error(dev, "premature interrupt"); 913 return IRQ_HANDLED; 914 } 915 916 /* Prevent race with das1800_ai_poll() on multi processor systems. 917 * Also protects indirect addressing in das1800_ai_handler */ 918 spin_lock(&dev->spinlock); 919 status = inb(dev->iobase + DAS1800_STATUS); 920 921 /* if interrupt was not caused by das-1800 */ 922 if (!(status & INT)) { 923 spin_unlock(&dev->spinlock); 924 return IRQ_NONE; 925 } 926 /* clear the interrupt status bit INT */ 927 outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS); 928 /* handle interrupt */ 929 das1800_ai_handler(dev); 930 931 spin_unlock(&dev->spinlock); 932 return IRQ_HANDLED; 933} 934 935/* the guts of the interrupt handler, that is shared with das1800_ai_poll */ 936static void das1800_ai_handler(struct comedi_device *dev) 937{ 938 struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */ 939 struct comedi_async *async = s->async; 940 struct comedi_cmd *cmd = &async->cmd; 941 unsigned int status = inb(dev->iobase + DAS1800_STATUS); 942 943 async->events = 0; 944 /* select adc for base address + 0 */ 945 outb(ADC, dev->iobase + DAS1800_SELECT); 946 /* dma buffer full */ 947 if (devpriv->irq_dma_bits & DMA_ENABLED) { 948 /* look for data from dma transfer even if dma terminal count hasn't happened yet */ 949 das1800_handle_dma(dev, s, status); 950 } else if (status & FHF) { /* if fifo half full */ 951 das1800_handle_fifo_half_full(dev, s); 952 } else if (status & FNE) { /* if fifo not empty */ 953 das1800_handle_fifo_not_empty(dev, s); 954 } 955 956 async->events |= COMEDI_CB_BLOCK; 957 /* if the card's fifo has overflowed */ 958 if (status & OVF) { 959 /* clear OVF interrupt bit */ 960 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS); 961 comedi_error(dev, "DAS1800 FIFO overflow"); 962 das1800_cancel(dev, s); 963 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA; 964 comedi_event(dev, s); 965 return; 966 } 967 /* stop taking data if appropriate */ 968 /* stop_src TRIG_EXT */ 969 if (status & CT0TC) { 970 /* clear CT0TC interrupt bit */ 971 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS); 972 /* make sure we get all remaining data from board before quitting */ 973 if (devpriv->irq_dma_bits & DMA_ENABLED) 974 das1800_flush_dma(dev, s); 975 else 976 das1800_handle_fifo_not_empty(dev, s); 977 das1800_cancel(dev, s); /* disable hardware conversions */ 978 async->events |= COMEDI_CB_EOA; 979 } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */ 980 das1800_cancel(dev, s); /* disable hardware conversions */ 981 async->events |= COMEDI_CB_EOA; 982 } 983 984 comedi_event(dev, s); 985 986 return; 987} 988 989static void das1800_handle_dma(struct comedi_device *dev, 990 struct comedi_subdevice *s, unsigned int status) 991{ 992 unsigned long flags; 993 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 994 995 flags = claim_dma_lock(); 996 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 997 devpriv->dma_current_buf); 998 /* re-enable dma channel */ 999 set_dma_addr(devpriv->dma_current, 1000 virt_to_bus(devpriv->dma_current_buf)); 1001 set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size); 1002 enable_dma(devpriv->dma_current); 1003 release_dma_lock(flags); 1004 1005 if (status & DMATC) { 1006 /* clear DMATC interrupt bit */ 1007 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS); 1008 /* switch dma channels for next time, if appropriate */ 1009 if (dual_dma) { 1010 /* read data from the other channel next time */ 1011 if (devpriv->dma_current == devpriv->dma0) { 1012 devpriv->dma_current = devpriv->dma1; 1013 devpriv->dma_current_buf = devpriv->ai_buf1; 1014 } else { 1015 devpriv->dma_current = devpriv->dma0; 1016 devpriv->dma_current_buf = devpriv->ai_buf0; 1017 } 1018 } 1019 } 1020 1021 return; 1022} 1023 1024static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev, 1025 uint16_t sample) 1026{ 1027 sample += 1 << (thisboard->resolution - 1); 1028 return sample; 1029} 1030 1031static void munge_data(struct comedi_device *dev, uint16_t * array, 1032 unsigned int num_elements) 1033{ 1034 unsigned int i; 1035 int unipolar; 1036 1037 /* see if card is using a unipolar or bipolar range so we can munge data correctly */ 1038 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB; 1039 1040 /* convert to unsigned type if we are in a bipolar mode */ 1041 if (!unipolar) { 1042 for (i = 0; i < num_elements; i++) { 1043 array[i] = munge_bipolar_sample(dev, array[i]); 1044 } 1045 } 1046} 1047 1048/* Utility function used by das1800_flush_dma() and das1800_handle_dma(). 1049 * Assumes dma lock is held */ 1050static void das1800_flush_dma_channel(struct comedi_device *dev, 1051 struct comedi_subdevice *s, 1052 unsigned int channel, uint16_t * buffer) 1053{ 1054 unsigned int num_bytes, num_samples; 1055 struct comedi_cmd *cmd = &s->async->cmd; 1056 1057 disable_dma(channel); 1058 1059 /* clear flip-flop to make sure 2-byte registers 1060 * get set correctly */ 1061 clear_dma_ff(channel); 1062 1063 /* figure out how many points to read */ 1064 num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel); 1065 num_samples = num_bytes / sizeof(short); 1066 1067 /* if we only need some of the points */ 1068 if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples) 1069 num_samples = devpriv->count; 1070 1071 munge_data(dev, buffer, num_samples); 1072 cfc_write_array_to_buffer(s, buffer, num_bytes); 1073 if (s->async->cmd.stop_src == TRIG_COUNT) 1074 devpriv->count -= num_samples; 1075 1076 return; 1077} 1078 1079/* flushes remaining data from board when external trigger has stopped aquisition 1080 * and we are using dma transfers */ 1081static void das1800_flush_dma(struct comedi_device *dev, 1082 struct comedi_subdevice *s) 1083{ 1084 unsigned long flags; 1085 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 1086 1087 flags = claim_dma_lock(); 1088 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 1089 devpriv->dma_current_buf); 1090 1091 if (dual_dma) { 1092 /* switch to other channel and flush it */ 1093 if (devpriv->dma_current == devpriv->dma0) { 1094 devpriv->dma_current = devpriv->dma1; 1095 devpriv->dma_current_buf = devpriv->ai_buf1; 1096 } else { 1097 devpriv->dma_current = devpriv->dma0; 1098 devpriv->dma_current_buf = devpriv->ai_buf0; 1099 } 1100 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 1101 devpriv->dma_current_buf); 1102 } 1103 1104 release_dma_lock(flags); 1105 1106 /* get any remaining samples in fifo */ 1107 das1800_handle_fifo_not_empty(dev, s); 1108 1109 return; 1110} 1111 1112static void das1800_handle_fifo_half_full(struct comedi_device *dev, 1113 struct comedi_subdevice *s) 1114{ 1115 int numPoints = 0; /* number of points to read */ 1116 struct comedi_cmd *cmd = &s->async->cmd; 1117 1118 numPoints = FIFO_SIZE / 2; 1119 /* if we only need some of the points */ 1120 if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints) 1121 numPoints = devpriv->count; 1122 insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints); 1123 munge_data(dev, devpriv->ai_buf0, numPoints); 1124 cfc_write_array_to_buffer(s, devpriv->ai_buf0, 1125 numPoints * sizeof(devpriv->ai_buf0[0])); 1126 if (cmd->stop_src == TRIG_COUNT) 1127 devpriv->count -= numPoints; 1128 return; 1129} 1130 1131static void das1800_handle_fifo_not_empty(struct comedi_device *dev, 1132 struct comedi_subdevice *s) 1133{ 1134 short dpnt; 1135 int unipolar; 1136 struct comedi_cmd *cmd = &s->async->cmd; 1137 1138 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB; 1139 1140 while (inb(dev->iobase + DAS1800_STATUS) & FNE) { 1141 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) 1142 break; 1143 dpnt = inw(dev->iobase + DAS1800_FIFO); 1144 /* convert to unsigned type if we are in a bipolar mode */ 1145 if (!unipolar) ; 1146 dpnt = munge_bipolar_sample(dev, dpnt); 1147 cfc_write_to_buffer(s, dpnt); 1148 if (cmd->stop_src == TRIG_COUNT) 1149 devpriv->count--; 1150 } 1151 1152 return; 1153} 1154 1155static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 1156{ 1157 outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */ 1158 outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */ 1159 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */ 1160 if (devpriv->dma0) 1161 disable_dma(devpriv->dma0); 1162 if (devpriv->dma1) 1163 disable_dma(devpriv->dma1); 1164 return 0; 1165} 1166 1167/* test analog input cmd */ 1168static int das1800_ai_do_cmdtest(struct comedi_device *dev, 1169 struct comedi_subdevice *s, 1170 struct comedi_cmd *cmd) 1171{ 1172 int err = 0; 1173 int tmp; 1174 unsigned int tmp_arg; 1175 int i; 1176 int unipolar; 1177 1178 /* step 1: make sure trigger sources are trivially valid */ 1179 1180 tmp = cmd->start_src; 1181 cmd->start_src &= TRIG_NOW | TRIG_EXT; 1182 if (!cmd->start_src || tmp != cmd->start_src) 1183 err++; 1184 1185 tmp = cmd->scan_begin_src; 1186 cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT; 1187 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src) 1188 err++; 1189 1190 tmp = cmd->convert_src; 1191 cmd->convert_src &= TRIG_TIMER | TRIG_EXT; 1192 if (!cmd->convert_src || tmp != cmd->convert_src) 1193 err++; 1194 1195 tmp = cmd->scan_end_src; 1196 cmd->scan_end_src &= TRIG_COUNT; 1197 if (!cmd->scan_end_src || tmp != cmd->scan_end_src) 1198 err++; 1199 1200 tmp = cmd->stop_src; 1201 cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE; 1202 if (!cmd->stop_src || tmp != cmd->stop_src) 1203 err++; 1204 1205 if (err) 1206 return 1; 1207 1208 /* step 2: make sure trigger sources are unique and mutually compatible */ 1209 1210 /* uniqueness check */ 1211 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT) 1212 err++; 1213 if (cmd->scan_begin_src != TRIG_FOLLOW && 1214 cmd->scan_begin_src != TRIG_TIMER && 1215 cmd->scan_begin_src != TRIG_EXT) 1216 err++; 1217 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT) 1218 err++; 1219 if (cmd->stop_src != TRIG_COUNT && 1220 cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT) 1221 err++; 1222 /* compatibility check */ 1223 if (cmd->scan_begin_src != TRIG_FOLLOW && 1224 cmd->convert_src != TRIG_TIMER) 1225 err++; 1226 1227 if (err) 1228 return 2; 1229 1230 /* step 3: make sure arguments are trivially compatible */ 1231 1232 if (cmd->start_arg != 0) { 1233 cmd->start_arg = 0; 1234 err++; 1235 } 1236 if (cmd->convert_src == TRIG_TIMER) { 1237 if (cmd->convert_arg < thisboard->ai_speed) { 1238 cmd->convert_arg = thisboard->ai_speed; 1239 err++; 1240 } 1241 } 1242 if (!cmd->chanlist_len) { 1243 cmd->chanlist_len = 1; 1244 err++; 1245 } 1246 if (cmd->scan_end_arg != cmd->chanlist_len) { 1247 cmd->scan_end_arg = cmd->chanlist_len; 1248 err++; 1249 } 1250 1251 switch (cmd->stop_src) { 1252 case TRIG_COUNT: 1253 if (!cmd->stop_arg) { 1254 cmd->stop_arg = 1; 1255 err++; 1256 } 1257 break; 1258 case TRIG_NONE: 1259 if (cmd->stop_arg != 0) { 1260 cmd->stop_arg = 0; 1261 err++; 1262 } 1263 break; 1264 default: 1265 break; 1266 } 1267 1268 if (err) 1269 return 3; 1270 1271 /* step 4: fix up any arguments */ 1272 1273 if (cmd->convert_src == TRIG_TIMER) { 1274 /* if we are not in burst mode */ 1275 if (cmd->scan_begin_src == TRIG_FOLLOW) { 1276 tmp_arg = cmd->convert_arg; 1277 /* calculate counter values that give desired timing */ 1278 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 1279 &(devpriv->divisor1), 1280 &(devpriv->divisor2), 1281 &(cmd->convert_arg), 1282 cmd-> 1283 flags & TRIG_ROUND_MASK); 1284 if (tmp_arg != cmd->convert_arg) 1285 err++; 1286 } 1287 /* if we are in burst mode */ 1288 else { 1289 /* check that convert_arg is compatible */ 1290 tmp_arg = cmd->convert_arg; 1291 cmd->convert_arg = 1292 burst_convert_arg(cmd->convert_arg, 1293 cmd->flags & TRIG_ROUND_MASK); 1294 if (tmp_arg != cmd->convert_arg) 1295 err++; 1296 1297 if (cmd->scan_begin_src == TRIG_TIMER) { 1298 /* if scans are timed faster than conversion rate allows */ 1299 if (cmd->convert_arg * cmd->chanlist_len > 1300 cmd->scan_begin_arg) { 1301 cmd->scan_begin_arg = 1302 cmd->convert_arg * 1303 cmd->chanlist_len; 1304 err++; 1305 } 1306 tmp_arg = cmd->scan_begin_arg; 1307 /* calculate counter values that give desired timing */ 1308 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 1309 &(devpriv-> 1310 divisor1), 1311 &(devpriv-> 1312 divisor2), 1313 &(cmd-> 1314 scan_begin_arg), 1315 cmd-> 1316 flags & 1317 TRIG_ROUND_MASK); 1318 if (tmp_arg != cmd->scan_begin_arg) 1319 err++; 1320 } 1321 } 1322 } 1323 1324 if (err) 1325 return 4; 1326 1327 /* make sure user is not trying to mix unipolar and bipolar ranges */ 1328 if (cmd->chanlist) { 1329 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR; 1330 for (i = 1; i < cmd->chanlist_len; i++) { 1331 if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) { 1332 comedi_error(dev, 1333 "unipolar and bipolar ranges cannot be mixed in the chanlist"); 1334 err++; 1335 break; 1336 } 1337 } 1338 } 1339 1340 if (err) 1341 return 5; 1342 1343 return 0; 1344} 1345 1346/* analog input cmd interface */ 1347 1348/* first, some utility functions used in the main ai_do_cmd() */ 1349 1350/* returns appropriate bits for control register a, depending on command */ 1351static int control_a_bits(struct comedi_cmd cmd) 1352{ 1353 int control_a; 1354 1355 control_a = FFEN; /* enable fifo */ 1356 if (cmd.stop_src == TRIG_EXT) { 1357 control_a |= ATEN; 1358 } 1359 switch (cmd.start_src) { 1360 case TRIG_EXT: 1361 control_a |= TGEN | CGSL; 1362 break; 1363 case TRIG_NOW: 1364 control_a |= CGEN; 1365 break; 1366 default: 1367 break; 1368 } 1369 1370 return control_a; 1371} 1372 1373/* returns appropriate bits for control register c, depending on command */ 1374static int control_c_bits(struct comedi_cmd cmd) 1375{ 1376 int control_c; 1377 int aref; 1378 1379 /* set clock source to internal or external, select analog reference, 1380 * select unipolar / bipolar 1381 */ 1382 aref = CR_AREF(cmd.chanlist[0]); 1383 control_c = UQEN; /* enable upper qram addresses */ 1384 if (aref != AREF_DIFF) 1385 control_c |= SD; 1386 if (aref == AREF_COMMON) 1387 control_c |= CMEN; 1388 /* if a unipolar range was selected */ 1389 if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR) 1390 control_c |= UB; 1391 switch (cmd.scan_begin_src) { 1392 case TRIG_FOLLOW: /* not in burst mode */ 1393 switch (cmd.convert_src) { 1394 case TRIG_TIMER: 1395 /* trig on cascaded counters */ 1396 control_c |= IPCLK; 1397 break; 1398 case TRIG_EXT: 1399 /* trig on falling edge of external trigger */ 1400 control_c |= XPCLK; 1401 break; 1402 default: 1403 break; 1404 } 1405 break; 1406 case TRIG_TIMER: 1407 /* burst mode with internal pacer clock */ 1408 control_c |= BMDE | IPCLK; 1409 break; 1410 case TRIG_EXT: 1411 /* burst mode with external trigger */ 1412 control_c |= BMDE | XPCLK; 1413 break; 1414 default: 1415 break; 1416 } 1417 1418 return control_c; 1419} 1420 1421/* sets up counters */ 1422static int setup_counters(struct comedi_device *dev, struct comedi_cmd cmd) 1423{ 1424 /* setup cascaded counters for conversion/scan frequency */ 1425 switch (cmd.scan_begin_src) { 1426 case TRIG_FOLLOW: /* not in burst mode */ 1427 if (cmd.convert_src == TRIG_TIMER) { 1428 /* set conversion frequency */ 1429 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 1430 &(devpriv->divisor1), 1431 &(devpriv->divisor2), 1432 &(cmd.convert_arg), 1433 cmd. 1434 flags & TRIG_ROUND_MASK); 1435 if (das1800_set_frequency(dev) < 0) { 1436 return -1; 1437 } 1438 } 1439 break; 1440 case TRIG_TIMER: /* in burst mode */ 1441 /* set scan frequency */ 1442 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1), 1443 &(devpriv->divisor2), 1444 &(cmd.scan_begin_arg), 1445 cmd.flags & TRIG_ROUND_MASK); 1446 if (das1800_set_frequency(dev) < 0) { 1447 return -1; 1448 } 1449 break; 1450 default: 1451 break; 1452 } 1453 1454 /* setup counter 0 for 'about triggering' */ 1455 if (cmd.stop_src == TRIG_EXT) { 1456 /* load counter 0 in mode 0 */ 1457 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0); 1458 } 1459 1460 return 0; 1461} 1462 1463/* sets up dma */ 1464static void setup_dma(struct comedi_device *dev, struct comedi_cmd cmd) 1465{ 1466 unsigned long lock_flags; 1467 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 1468 1469 if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0) 1470 return; 1471 1472 /* determine a reasonable dma transfer size */ 1473 devpriv->dma_transfer_size = suggest_transfer_size(&cmd); 1474 lock_flags = claim_dma_lock(); 1475 disable_dma(devpriv->dma0); 1476 /* clear flip-flop to make sure 2-byte registers for 1477 * count and address get set correctly */ 1478 clear_dma_ff(devpriv->dma0); 1479 set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0)); 1480 /* set appropriate size of transfer */ 1481 set_dma_count(devpriv->dma0, devpriv->dma_transfer_size); 1482 devpriv->dma_current = devpriv->dma0; 1483 devpriv->dma_current_buf = devpriv->ai_buf0; 1484 enable_dma(devpriv->dma0); 1485 /* set up dual dma if appropriate */ 1486 if (dual_dma) { 1487 disable_dma(devpriv->dma1); 1488 /* clear flip-flop to make sure 2-byte registers for 1489 * count and address get set correctly */ 1490 clear_dma_ff(devpriv->dma1); 1491 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1)); 1492 /* set appropriate size of transfer */ 1493 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size); 1494 enable_dma(devpriv->dma1); 1495 } 1496 release_dma_lock(lock_flags); 1497 1498 return; 1499} 1500 1501/* programs channel/gain list into card */ 1502static void program_chanlist(struct comedi_device *dev, struct comedi_cmd cmd) 1503{ 1504 int i, n, chan_range; 1505 unsigned long irq_flags; 1506 const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */ 1507 const int range_bitshift = 8; 1508 1509 n = cmd.chanlist_len; 1510 /* spinlock protects indirect addressing */ 1511 spin_lock_irqsave(&dev->spinlock, irq_flags); 1512 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */ 1513 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */ 1514 /* make channel / gain list */ 1515 for (i = 0; i < n; i++) { 1516 chan_range = 1517 CR_CHAN(cmd. 1518 chanlist[i]) | ((CR_RANGE(cmd.chanlist[i]) & 1519 range_mask) << range_bitshift); 1520 outw(chan_range, dev->iobase + DAS1800_QRAM); 1521 } 1522 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */ 1523 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1524 1525 return; 1526} 1527 1528/* analog input do_cmd */ 1529static int das1800_ai_do_cmd(struct comedi_device *dev, 1530 struct comedi_subdevice *s) 1531{ 1532 int ret; 1533 int control_a, control_c; 1534 struct comedi_async *async = s->async; 1535 struct comedi_cmd cmd = async->cmd; 1536 1537 if (!dev->irq) { 1538 comedi_error(dev, 1539 "no irq assigned for das-1800, cannot do hardware conversions"); 1540 return -1; 1541 } 1542 1543 /* disable dma on TRIG_WAKE_EOS, or TRIG_RT 1544 * (because dma in handler is unsafe at hard real-time priority) */ 1545 if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT)) { 1546 devpriv->irq_dma_bits &= ~DMA_ENABLED; 1547 } else { 1548 devpriv->irq_dma_bits |= devpriv->dma_bits; 1549 } 1550 /* interrupt on end of conversion for TRIG_WAKE_EOS */ 1551 if (cmd.flags & TRIG_WAKE_EOS) { 1552 /* interrupt fifo not empty */ 1553 devpriv->irq_dma_bits &= ~FIMD; 1554 } else { 1555 /* interrupt fifo half full */ 1556 devpriv->irq_dma_bits |= FIMD; 1557 } 1558 /* determine how many conversions we need */ 1559 if (cmd.stop_src == TRIG_COUNT) { 1560 devpriv->count = cmd.stop_arg * cmd.chanlist_len; 1561 } 1562 1563 das1800_cancel(dev, s); 1564 1565 /* determine proper bits for control registers */ 1566 control_a = control_a_bits(cmd); 1567 control_c = control_c_bits(cmd); 1568 1569 /* setup card and start */ 1570 program_chanlist(dev, cmd); 1571 ret = setup_counters(dev, cmd); 1572 if (ret < 0) { 1573 comedi_error(dev, "Error setting up counters"); 1574 return ret; 1575 } 1576 setup_dma(dev, cmd); 1577 outb(control_c, dev->iobase + DAS1800_CONTROL_C); 1578 /* set conversion rate and length for burst mode */ 1579 if (control_c & BMDE) { 1580 /* program conversion period with number of microseconds minus 1 */ 1581 outb(cmd.convert_arg / 1000 - 1, 1582 dev->iobase + DAS1800_BURST_RATE); 1583 outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH); 1584 } 1585 outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */ 1586 outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */ 1587 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */ 1588 1589 return 0; 1590} 1591 1592/* read analog input */ 1593static int das1800_ai_rinsn(struct comedi_device *dev, 1594 struct comedi_subdevice *s, 1595 struct comedi_insn *insn, unsigned int *data) 1596{ 1597 int i, n; 1598 int chan, range, aref, chan_range; 1599 int timeout = 1000; 1600 short dpnt; 1601 int conv_flags = 0; 1602 unsigned long irq_flags; 1603 1604 /* set up analog reference and unipolar / bipolar mode */ 1605 aref = CR_AREF(insn->chanspec); 1606 conv_flags |= UQEN; 1607 if (aref != AREF_DIFF) 1608 conv_flags |= SD; 1609 if (aref == AREF_COMMON) 1610 conv_flags |= CMEN; 1611 /* if a unipolar range was selected */ 1612 if (CR_RANGE(insn->chanspec) & UNIPOLAR) 1613 conv_flags |= UB; 1614 1615 outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */ 1616 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */ 1617 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */ 1618 outb(FFEN, dev->iobase + DAS1800_CONTROL_A); 1619 1620 chan = CR_CHAN(insn->chanspec); 1621 /* mask of unipolar/bipolar bit from range */ 1622 range = CR_RANGE(insn->chanspec) & 0x3; 1623 chan_range = chan | (range << 8); 1624 spin_lock_irqsave(&dev->spinlock, irq_flags); 1625 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */ 1626 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */ 1627 outw(chan_range, dev->iobase + DAS1800_QRAM); 1628 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */ 1629 outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */ 1630 1631 for (n = 0; n < insn->n; n++) { 1632 /* trigger conversion */ 1633 outb(0, dev->iobase + DAS1800_FIFO); 1634 for (i = 0; i < timeout; i++) { 1635 if (inb(dev->iobase + DAS1800_STATUS) & FNE) 1636 break; 1637 } 1638 if (i == timeout) { 1639 comedi_error(dev, "timeout"); 1640 return -ETIME; 1641 } 1642 dpnt = inw(dev->iobase + DAS1800_FIFO); 1643 /* shift data to offset binary for bipolar ranges */ 1644 if ((conv_flags & UB) == 0) 1645 dpnt += 1 << (thisboard->resolution - 1); 1646 data[n] = dpnt; 1647 } 1648 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1649 1650 return n; 1651} 1652 1653/* writes to an analog output channel */ 1654static int das1800_ao_winsn(struct comedi_device *dev, 1655 struct comedi_subdevice *s, 1656 struct comedi_insn *insn, unsigned int *data) 1657{ 1658 int chan = CR_CHAN(insn->chanspec); 1659/* int range = CR_RANGE(insn->chanspec); */ 1660 int update_chan = thisboard->ao_n_chan - 1; 1661 short output; 1662 unsigned long irq_flags; 1663 1664 /* card expects two's complement data */ 1665 output = data[0] - (1 << (thisboard->resolution - 1)); 1666 /* if the write is to the 'update' channel, we need to remember its value */ 1667 if (chan == update_chan) 1668 devpriv->ao_update_bits = output; 1669 /* write to channel */ 1670 spin_lock_irqsave(&dev->spinlock, irq_flags); 1671 outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */ 1672 outw(output, dev->iobase + DAS1800_DAC); 1673 /* now we need to write to 'update' channel to update all dac channels */ 1674 if (chan != update_chan) { 1675 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */ 1676 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC); 1677 } 1678 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1679 1680 return 1; 1681} 1682 1683/* reads from digital input channels */ 1684static int das1800_di_rbits(struct comedi_device *dev, 1685 struct comedi_subdevice *s, 1686 struct comedi_insn *insn, unsigned int *data) 1687{ 1688 1689 data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf; 1690 data[0] = 0; 1691 1692 return 2; 1693} 1694 1695/* writes to digital output channels */ 1696static int das1800_do_wbits(struct comedi_device *dev, 1697 struct comedi_subdevice *s, 1698 struct comedi_insn *insn, unsigned int *data) 1699{ 1700 unsigned int wbits; 1701 1702 /* only set bits that have been masked */ 1703 data[0] &= (1 << s->n_chan) - 1; 1704 wbits = devpriv->do_bits; 1705 wbits &= ~data[0]; 1706 wbits |= data[0] & data[1]; 1707 devpriv->do_bits = wbits; 1708 1709 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL); 1710 1711 data[1] = devpriv->do_bits; 1712 1713 return 2; 1714} 1715 1716/* loads counters with divisor1, divisor2 from private structure */ 1717static int das1800_set_frequency(struct comedi_device *dev) 1718{ 1719 int err = 0; 1720 1721 /* counter 1, mode 2 */ 1722 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1, 1723 2)) 1724 err++; 1725 /* counter 2, mode 2 */ 1726 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2, 1727 2)) 1728 err++; 1729 if (err) 1730 return -1; 1731 1732 return 0; 1733} 1734 1735/* converts requested conversion timing to timing compatible with 1736 * hardware, used only when card is in 'burst mode' 1737 */ 1738static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode) 1739{ 1740 unsigned int micro_sec; 1741 1742 /* in burst mode, the maximum conversion time is 64 microseconds */ 1743 if (convert_arg > 64000) 1744 convert_arg = 64000; 1745 1746 /* the conversion time must be an integral number of microseconds */ 1747 switch (round_mode) { 1748 case TRIG_ROUND_NEAREST: 1749 default: 1750 micro_sec = (convert_arg + 500) / 1000; 1751 break; 1752 case TRIG_ROUND_DOWN: 1753 micro_sec = convert_arg / 1000; 1754 break; 1755 case TRIG_ROUND_UP: 1756 micro_sec = (convert_arg - 1) / 1000 + 1; 1757 break; 1758 } 1759 1760 /* return number of nanoseconds */ 1761 return micro_sec * 1000; 1762} 1763 1764/* utility function that suggests a dma transfer size based on the conversion period 'ns' */ 1765static unsigned int suggest_transfer_size(struct comedi_cmd *cmd) 1766{ 1767 unsigned int size = DMA_BUF_SIZE; 1768 static const int sample_size = 2; /* size in bytes of one sample from board */ 1769 unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */ 1770 unsigned int max_size; /* maximum size we will allow for a transfer */ 1771 1772 /* make dma buffer fill in 0.3 seconds for timed modes */ 1773 switch (cmd->scan_begin_src) { 1774 case TRIG_FOLLOW: /* not in burst mode */ 1775 if (cmd->convert_src == TRIG_TIMER) 1776 size = (fill_time / cmd->convert_arg) * sample_size; 1777 break; 1778 case TRIG_TIMER: 1779 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) * 1780 sample_size; 1781 break; 1782 default: 1783 size = DMA_BUF_SIZE; 1784 break; 1785 } 1786 1787 /* set a minimum and maximum size allowed */ 1788 max_size = DMA_BUF_SIZE; 1789 /* if we are taking limited number of conversions, limit transfer size to that */ 1790 if (cmd->stop_src == TRIG_COUNT && 1791 cmd->stop_arg * cmd->chanlist_len * sample_size < max_size) 1792 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size; 1793 1794 if (size > max_size) 1795 size = max_size; 1796 if (size < sample_size) 1797 size = sample_size; 1798 1799 return size; 1800} 1801