das1800.c revision 7114a28011f9d5f3d981731ad341177c21f9d948
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 */ 534static int __init driver_das1800_init_module(void) 535{ 536 return comedi_driver_register(&driver_das1800); 537} 538 539static void __exit driver_das1800_cleanup_module(void) 540{ 541 comedi_driver_unregister(&driver_das1800); 542} 543 544module_init(driver_das1800_init_module); 545module_exit(driver_das1800_cleanup_module); 546 547static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0, 548 unsigned int dma1) 549{ 550 unsigned long flags; 551 552 /* need an irq to do dma */ 553 if (dev->irq && dma0) { 554 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */ 555 switch ((dma0 & 0x7) | (dma1 << 4)) { 556 case 0x5: /* dma0 == 5 */ 557 devpriv->dma_bits |= DMA_CH5; 558 break; 559 case 0x6: /* dma0 == 6 */ 560 devpriv->dma_bits |= DMA_CH6; 561 break; 562 case 0x7: /* dma0 == 7 */ 563 devpriv->dma_bits |= DMA_CH7; 564 break; 565 case 0x65: /* dma0 == 5, dma1 == 6 */ 566 devpriv->dma_bits |= DMA_CH5_CH6; 567 break; 568 case 0x76: /* dma0 == 6, dma1 == 7 */ 569 devpriv->dma_bits |= DMA_CH6_CH7; 570 break; 571 case 0x57: /* dma0 == 7, dma1 == 5 */ 572 devpriv->dma_bits |= DMA_CH7_CH5; 573 break; 574 default: 575 printk(" only supports dma channels 5 through 7\n" 576 " Dual dma only allows the following combinations:\n" 577 " dma 5,6 / 6,7 / or 7,5\n"); 578 return -EINVAL; 579 break; 580 } 581 if (request_dma(dma0, driver_das1800.driver_name)) { 582 printk(" failed to allocate dma channel %i\n", dma0); 583 return -EINVAL; 584 } 585 devpriv->dma0 = dma0; 586 devpriv->dma_current = dma0; 587 if (dma1) { 588 if (request_dma(dma1, driver_das1800.driver_name)) { 589 printk(" failed to allocate dma channel %i\n", 590 dma1); 591 return -EINVAL; 592 } 593 devpriv->dma1 = dma1; 594 } 595 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA); 596 if (devpriv->ai_buf0 == NULL) 597 return -ENOMEM; 598 devpriv->dma_current_buf = devpriv->ai_buf0; 599 if (dma1) { 600 devpriv->ai_buf1 = 601 kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA); 602 if (devpriv->ai_buf1 == NULL) 603 return -ENOMEM; 604 } 605 flags = claim_dma_lock(); 606 disable_dma(devpriv->dma0); 607 set_dma_mode(devpriv->dma0, DMA_MODE_READ); 608 if (dma1) { 609 disable_dma(devpriv->dma1); 610 set_dma_mode(devpriv->dma1, DMA_MODE_READ); 611 } 612 release_dma_lock(flags); 613 } 614 return 0; 615} 616 617static int das1800_attach(struct comedi_device *dev, 618 struct comedi_devconfig *it) 619{ 620 struct comedi_subdevice *s; 621 unsigned long iobase = it->options[0]; 622 unsigned int irq = it->options[1]; 623 unsigned int dma0 = it->options[2]; 624 unsigned int dma1 = it->options[3]; 625 unsigned long iobase2; 626 int board; 627 int retval; 628 629 /* allocate and initialize dev->private */ 630 if (alloc_private(dev, sizeof(struct das1800_private)) < 0) 631 return -ENOMEM; 632 633 printk("comedi%d: %s: io 0x%lx", dev->minor, driver_das1800.driver_name, 634 iobase); 635 if (irq) { 636 printk(", irq %u", irq); 637 if (dma0) { 638 printk(", dma %u", dma0); 639 if (dma1) 640 printk(" and %u", dma1); 641 } 642 } 643 printk("\n"); 644 645 if (iobase == 0) { 646 printk(" io base address required\n"); 647 return -EINVAL; 648 } 649 650 /* check if io addresses are available */ 651 if (!request_region(iobase, DAS1800_SIZE, driver_das1800.driver_name)) { 652 printk 653 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", 654 iobase, iobase + DAS1800_SIZE - 1); 655 return -EIO; 656 } 657 dev->iobase = iobase; 658 659 board = das1800_probe(dev); 660 if (board < 0) { 661 printk(" unable to determine board type\n"); 662 return -ENODEV; 663 } 664 665 dev->board_ptr = das1800_boards + board; 666 dev->board_name = thisboard->name; 667 668 /* if it is an 'ao' board with fancy analog out then we need extra io ports */ 669 if (thisboard->ao_ability == 2) { 670 iobase2 = iobase + IOBASE2; 671 if (!request_region(iobase2, DAS1800_SIZE, 672 driver_das1800.driver_name)) { 673 printk 674 (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n", 675 iobase2, iobase2 + DAS1800_SIZE - 1); 676 return -EIO; 677 } 678 devpriv->iobase2 = iobase2; 679 } 680 681 /* grab our IRQ */ 682 if (irq) { 683 if (request_irq(irq, das1800_interrupt, 0, 684 driver_das1800.driver_name, dev)) { 685 printk(" unable to allocate irq %u\n", irq); 686 return -EINVAL; 687 } 688 } 689 dev->irq = irq; 690 691 /* set bits that tell card which irq to use */ 692 switch (irq) { 693 case 0: 694 break; 695 case 3: 696 devpriv->irq_dma_bits |= 0x8; 697 break; 698 case 5: 699 devpriv->irq_dma_bits |= 0x10; 700 break; 701 case 7: 702 devpriv->irq_dma_bits |= 0x18; 703 break; 704 case 10: 705 devpriv->irq_dma_bits |= 0x28; 706 break; 707 case 11: 708 devpriv->irq_dma_bits |= 0x30; 709 break; 710 case 15: 711 devpriv->irq_dma_bits |= 0x38; 712 break; 713 default: 714 printk(" irq out of range\n"); 715 return -EINVAL; 716 break; 717 } 718 719 retval = das1800_init_dma(dev, dma0, dma1); 720 if (retval < 0) 721 return retval; 722 723 if (devpriv->ai_buf0 == NULL) { 724 devpriv->ai_buf0 = 725 kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL); 726 if (devpriv->ai_buf0 == NULL) 727 return -ENOMEM; 728 } 729 730 if (alloc_subdevices(dev, 4) < 0) 731 return -ENOMEM; 732 733 /* analog input subdevice */ 734 s = dev->subdevices + 0; 735 dev->read_subdev = s; 736 s->type = COMEDI_SUBD_AI; 737 s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ; 738 if (thisboard->common) 739 s->subdev_flags |= SDF_COMMON; 740 s->n_chan = thisboard->qram_len; 741 s->len_chanlist = thisboard->qram_len; 742 s->maxdata = (1 << thisboard->resolution) - 1; 743 s->range_table = thisboard->range_ai; 744 s->do_cmd = das1800_ai_do_cmd; 745 s->do_cmdtest = das1800_ai_do_cmdtest; 746 s->insn_read = das1800_ai_rinsn; 747 s->poll = das1800_ai_poll; 748 s->cancel = das1800_cancel; 749 750 /* analog out */ 751 s = dev->subdevices + 1; 752 if (thisboard->ao_ability == 1) { 753 s->type = COMEDI_SUBD_AO; 754 s->subdev_flags = SDF_WRITABLE; 755 s->n_chan = thisboard->ao_n_chan; 756 s->maxdata = (1 << thisboard->resolution) - 1; 757 s->range_table = &range_ao_1; 758 s->insn_write = das1800_ao_winsn; 759 } else { 760 s->type = COMEDI_SUBD_UNUSED; 761 } 762 763 /* di */ 764 s = dev->subdevices + 2; 765 s->type = COMEDI_SUBD_DI; 766 s->subdev_flags = SDF_READABLE; 767 s->n_chan = 4; 768 s->maxdata = 1; 769 s->range_table = &range_digital; 770 s->insn_bits = das1800_di_rbits; 771 772 /* do */ 773 s = dev->subdevices + 3; 774 s->type = COMEDI_SUBD_DO; 775 s->subdev_flags = SDF_WRITABLE | SDF_READABLE; 776 s->n_chan = thisboard->do_n_chan; 777 s->maxdata = 1; 778 s->range_table = &range_digital; 779 s->insn_bits = das1800_do_wbits; 780 781 das1800_cancel(dev, dev->read_subdev); 782 783 /* initialize digital out channels */ 784 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL); 785 786 /* initialize analog out channels */ 787 if (thisboard->ao_ability == 1) { 788 /* select 'update' dac channel for baseAddress + 0x0 */ 789 outb(DAC(thisboard->ao_n_chan - 1), 790 dev->iobase + DAS1800_SELECT); 791 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC); 792 } 793 794 return 0; 795}; 796 797static int das1800_detach(struct comedi_device *dev) 798{ 799 /* only free stuff if it has been allocated by _attach */ 800 if (dev->iobase) 801 release_region(dev->iobase, DAS1800_SIZE); 802 if (dev->irq) 803 free_irq(dev->irq, dev); 804 if (dev->private) { 805 if (devpriv->iobase2) 806 release_region(devpriv->iobase2, DAS1800_SIZE); 807 if (devpriv->dma0) 808 free_dma(devpriv->dma0); 809 if (devpriv->dma1) 810 free_dma(devpriv->dma1); 811 kfree(devpriv->ai_buf0); 812 kfree(devpriv->ai_buf1); 813 } 814 815 printk("comedi%d: %s: remove\n", dev->minor, 816 driver_das1800.driver_name); 817 818 return 0; 819}; 820 821/* probes and checks das-1800 series board type 822 */ 823static int das1800_probe(struct comedi_device *dev) 824{ 825 int id; 826 int board; 827 828 id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf; /* get id bits */ 829 board = ((struct das1800_board *)dev->board_ptr) - das1800_boards; 830 831 switch (id) { 832 case 0x3: 833 if (board == das1801st_da || board == das1802st_da || 834 board == das1701st_da || board == das1702st_da) { 835 printk(" Board model: %s\n", 836 das1800_boards[board].name); 837 return board; 838 } 839 printk 840 (" Board model (probed, not recommended): das-1800st-da series\n"); 841 return das1801st; 842 break; 843 case 0x4: 844 if (board == das1802hr_da || board == das1702hr_da) { 845 printk(" Board model: %s\n", 846 das1800_boards[board].name); 847 return board; 848 } 849 printk 850 (" Board model (probed, not recommended): das-1802hr-da\n"); 851 return das1802hr; 852 break; 853 case 0x5: 854 if (board == das1801ao || board == das1802ao || 855 board == das1701ao || board == das1702ao) { 856 printk(" Board model: %s\n", 857 das1800_boards[board].name); 858 return board; 859 } 860 printk 861 (" Board model (probed, not recommended): das-1800ao series\n"); 862 return das1801ao; 863 break; 864 case 0x6: 865 if (board == das1802hr || board == das1702hr) { 866 printk(" Board model: %s\n", 867 das1800_boards[board].name); 868 return board; 869 } 870 printk(" Board model (probed, not recommended): das-1802hr\n"); 871 return das1802hr; 872 break; 873 case 0x7: 874 if (board == das1801st || board == das1802st || 875 board == das1701st || board == das1702st) { 876 printk(" Board model: %s\n", 877 das1800_boards[board].name); 878 return board; 879 } 880 printk 881 (" Board model (probed, not recommended): das-1800st series\n"); 882 return das1801st; 883 break; 884 case 0x8: 885 if (board == das1801hc || board == das1802hc) { 886 printk(" Board model: %s\n", 887 das1800_boards[board].name); 888 return board; 889 } 890 printk 891 (" Board model (probed, not recommended): das-1800hc series\n"); 892 return das1801hc; 893 break; 894 default: 895 printk 896 (" Board model: probe returned 0x%x (unknown, please report)\n", 897 id); 898 return board; 899 break; 900 } 901 return -1; 902} 903 904static int das1800_ai_poll(struct comedi_device *dev, 905 struct comedi_subdevice *s) 906{ 907 unsigned long flags; 908 909 /* prevent race with interrupt handler */ 910 spin_lock_irqsave(&dev->spinlock, flags); 911 das1800_ai_handler(dev); 912 spin_unlock_irqrestore(&dev->spinlock, flags); 913 914 return s->async->buf_write_count - s->async->buf_read_count; 915} 916 917static irqreturn_t das1800_interrupt(int irq, void *d) 918{ 919 struct comedi_device *dev = d; 920 unsigned int status; 921 922 if (dev->attached == 0) { 923 comedi_error(dev, "premature interrupt"); 924 return IRQ_HANDLED; 925 } 926 927 /* Prevent race with das1800_ai_poll() on multi processor systems. 928 * Also protects indirect addressing in das1800_ai_handler */ 929 spin_lock(&dev->spinlock); 930 status = inb(dev->iobase + DAS1800_STATUS); 931 932 /* if interrupt was not caused by das-1800 */ 933 if (!(status & INT)) { 934 spin_unlock(&dev->spinlock); 935 return IRQ_NONE; 936 } 937 /* clear the interrupt status bit INT */ 938 outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS); 939 /* handle interrupt */ 940 das1800_ai_handler(dev); 941 942 spin_unlock(&dev->spinlock); 943 return IRQ_HANDLED; 944} 945 946/* the guts of the interrupt handler, that is shared with das1800_ai_poll */ 947static void das1800_ai_handler(struct comedi_device *dev) 948{ 949 struct comedi_subdevice *s = dev->subdevices + 0; /* analog input subdevice */ 950 struct comedi_async *async = s->async; 951 struct comedi_cmd *cmd = &async->cmd; 952 unsigned int status = inb(dev->iobase + DAS1800_STATUS); 953 954 async->events = 0; 955 /* select adc for base address + 0 */ 956 outb(ADC, dev->iobase + DAS1800_SELECT); 957 /* dma buffer full */ 958 if (devpriv->irq_dma_bits & DMA_ENABLED) { 959 /* look for data from dma transfer even if dma terminal count hasn't happened yet */ 960 das1800_handle_dma(dev, s, status); 961 } else if (status & FHF) { /* if fifo half full */ 962 das1800_handle_fifo_half_full(dev, s); 963 } else if (status & FNE) { /* if fifo not empty */ 964 das1800_handle_fifo_not_empty(dev, s); 965 } 966 967 async->events |= COMEDI_CB_BLOCK; 968 /* if the card's fifo has overflowed */ 969 if (status & OVF) { 970 /* clear OVF interrupt bit */ 971 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS); 972 comedi_error(dev, "DAS1800 FIFO overflow"); 973 das1800_cancel(dev, s); 974 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA; 975 comedi_event(dev, s); 976 return; 977 } 978 /* stop taking data if appropriate */ 979 /* stop_src TRIG_EXT */ 980 if (status & CT0TC) { 981 /* clear CT0TC interrupt bit */ 982 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS); 983 /* make sure we get all remaining data from board before quitting */ 984 if (devpriv->irq_dma_bits & DMA_ENABLED) 985 das1800_flush_dma(dev, s); 986 else 987 das1800_handle_fifo_not_empty(dev, s); 988 das1800_cancel(dev, s); /* disable hardware conversions */ 989 async->events |= COMEDI_CB_EOA; 990 } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) { /* stop_src TRIG_COUNT */ 991 das1800_cancel(dev, s); /* disable hardware conversions */ 992 async->events |= COMEDI_CB_EOA; 993 } 994 995 comedi_event(dev, s); 996 997 return; 998} 999 1000static void das1800_handle_dma(struct comedi_device *dev, 1001 struct comedi_subdevice *s, unsigned int status) 1002{ 1003 unsigned long flags; 1004 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 1005 1006 flags = claim_dma_lock(); 1007 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 1008 devpriv->dma_current_buf); 1009 /* re-enable dma channel */ 1010 set_dma_addr(devpriv->dma_current, 1011 virt_to_bus(devpriv->dma_current_buf)); 1012 set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size); 1013 enable_dma(devpriv->dma_current); 1014 release_dma_lock(flags); 1015 1016 if (status & DMATC) { 1017 /* clear DMATC interrupt bit */ 1018 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS); 1019 /* switch dma channels for next time, if appropriate */ 1020 if (dual_dma) { 1021 /* read data from the other channel next time */ 1022 if (devpriv->dma_current == devpriv->dma0) { 1023 devpriv->dma_current = devpriv->dma1; 1024 devpriv->dma_current_buf = devpriv->ai_buf1; 1025 } else { 1026 devpriv->dma_current = devpriv->dma0; 1027 devpriv->dma_current_buf = devpriv->ai_buf0; 1028 } 1029 } 1030 } 1031 1032 return; 1033} 1034 1035static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev, 1036 uint16_t sample) 1037{ 1038 sample += 1 << (thisboard->resolution - 1); 1039 return sample; 1040} 1041 1042static void munge_data(struct comedi_device *dev, uint16_t * array, 1043 unsigned int num_elements) 1044{ 1045 unsigned int i; 1046 int unipolar; 1047 1048 /* see if card is using a unipolar or bipolar range so we can munge data correctly */ 1049 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB; 1050 1051 /* convert to unsigned type if we are in a bipolar mode */ 1052 if (!unipolar) { 1053 for (i = 0; i < num_elements; i++) { 1054 array[i] = munge_bipolar_sample(dev, array[i]); 1055 } 1056 } 1057} 1058 1059/* Utility function used by das1800_flush_dma() and das1800_handle_dma(). 1060 * Assumes dma lock is held */ 1061static void das1800_flush_dma_channel(struct comedi_device *dev, 1062 struct comedi_subdevice *s, 1063 unsigned int channel, uint16_t * buffer) 1064{ 1065 unsigned int num_bytes, num_samples; 1066 struct comedi_cmd *cmd = &s->async->cmd; 1067 1068 disable_dma(channel); 1069 1070 /* clear flip-flop to make sure 2-byte registers 1071 * get set correctly */ 1072 clear_dma_ff(channel); 1073 1074 /* figure out how many points to read */ 1075 num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel); 1076 num_samples = num_bytes / sizeof(short); 1077 1078 /* if we only need some of the points */ 1079 if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples) 1080 num_samples = devpriv->count; 1081 1082 munge_data(dev, buffer, num_samples); 1083 cfc_write_array_to_buffer(s, buffer, num_bytes); 1084 if (s->async->cmd.stop_src == TRIG_COUNT) 1085 devpriv->count -= num_samples; 1086 1087 return; 1088} 1089 1090/* flushes remaining data from board when external trigger has stopped aquisition 1091 * and we are using dma transfers */ 1092static void das1800_flush_dma(struct comedi_device *dev, 1093 struct comedi_subdevice *s) 1094{ 1095 unsigned long flags; 1096 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 1097 1098 flags = claim_dma_lock(); 1099 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 1100 devpriv->dma_current_buf); 1101 1102 if (dual_dma) { 1103 /* switch to other channel and flush it */ 1104 if (devpriv->dma_current == devpriv->dma0) { 1105 devpriv->dma_current = devpriv->dma1; 1106 devpriv->dma_current_buf = devpriv->ai_buf1; 1107 } else { 1108 devpriv->dma_current = devpriv->dma0; 1109 devpriv->dma_current_buf = devpriv->ai_buf0; 1110 } 1111 das1800_flush_dma_channel(dev, s, devpriv->dma_current, 1112 devpriv->dma_current_buf); 1113 } 1114 1115 release_dma_lock(flags); 1116 1117 /* get any remaining samples in fifo */ 1118 das1800_handle_fifo_not_empty(dev, s); 1119 1120 return; 1121} 1122 1123static void das1800_handle_fifo_half_full(struct comedi_device *dev, 1124 struct comedi_subdevice *s) 1125{ 1126 int numPoints = 0; /* number of points to read */ 1127 struct comedi_cmd *cmd = &s->async->cmd; 1128 1129 numPoints = FIFO_SIZE / 2; 1130 /* if we only need some of the points */ 1131 if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints) 1132 numPoints = devpriv->count; 1133 insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints); 1134 munge_data(dev, devpriv->ai_buf0, numPoints); 1135 cfc_write_array_to_buffer(s, devpriv->ai_buf0, 1136 numPoints * sizeof(devpriv->ai_buf0[0])); 1137 if (cmd->stop_src == TRIG_COUNT) 1138 devpriv->count -= numPoints; 1139 return; 1140} 1141 1142static void das1800_handle_fifo_not_empty(struct comedi_device *dev, 1143 struct comedi_subdevice *s) 1144{ 1145 short dpnt; 1146 int unipolar; 1147 struct comedi_cmd *cmd = &s->async->cmd; 1148 1149 unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB; 1150 1151 while (inb(dev->iobase + DAS1800_STATUS) & FNE) { 1152 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) 1153 break; 1154 dpnt = inw(dev->iobase + DAS1800_FIFO); 1155 /* convert to unsigned type if we are in a bipolar mode */ 1156 if (!unipolar) ; 1157 dpnt = munge_bipolar_sample(dev, dpnt); 1158 cfc_write_to_buffer(s, dpnt); 1159 if (cmd->stop_src == TRIG_COUNT) 1160 devpriv->count--; 1161 } 1162 1163 return; 1164} 1165 1166static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 1167{ 1168 outb(0x0, dev->iobase + DAS1800_STATUS); /* disable conversions */ 1169 outb(0x0, dev->iobase + DAS1800_CONTROL_B); /* disable interrupts and dma */ 1170 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* disable and clear fifo and stop triggering */ 1171 if (devpriv->dma0) 1172 disable_dma(devpriv->dma0); 1173 if (devpriv->dma1) 1174 disable_dma(devpriv->dma1); 1175 return 0; 1176} 1177 1178/* test analog input cmd */ 1179static int das1800_ai_do_cmdtest(struct comedi_device *dev, 1180 struct comedi_subdevice *s, 1181 struct comedi_cmd *cmd) 1182{ 1183 int err = 0; 1184 int tmp; 1185 unsigned int tmp_arg; 1186 int i; 1187 int unipolar; 1188 1189 /* step 1: make sure trigger sources are trivially valid */ 1190 1191 tmp = cmd->start_src; 1192 cmd->start_src &= TRIG_NOW | TRIG_EXT; 1193 if (!cmd->start_src || tmp != cmd->start_src) 1194 err++; 1195 1196 tmp = cmd->scan_begin_src; 1197 cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT; 1198 if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src) 1199 err++; 1200 1201 tmp = cmd->convert_src; 1202 cmd->convert_src &= TRIG_TIMER | TRIG_EXT; 1203 if (!cmd->convert_src || tmp != cmd->convert_src) 1204 err++; 1205 1206 tmp = cmd->scan_end_src; 1207 cmd->scan_end_src &= TRIG_COUNT; 1208 if (!cmd->scan_end_src || tmp != cmd->scan_end_src) 1209 err++; 1210 1211 tmp = cmd->stop_src; 1212 cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE; 1213 if (!cmd->stop_src || tmp != cmd->stop_src) 1214 err++; 1215 1216 if (err) 1217 return 1; 1218 1219 /* step 2: make sure trigger sources are unique and mutually compatible */ 1220 1221 /* uniqueness check */ 1222 if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT) 1223 err++; 1224 if (cmd->scan_begin_src != TRIG_FOLLOW && 1225 cmd->scan_begin_src != TRIG_TIMER && 1226 cmd->scan_begin_src != TRIG_EXT) 1227 err++; 1228 if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT) 1229 err++; 1230 if (cmd->stop_src != TRIG_COUNT && 1231 cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT) 1232 err++; 1233 /* compatibility check */ 1234 if (cmd->scan_begin_src != TRIG_FOLLOW && 1235 cmd->convert_src != TRIG_TIMER) 1236 err++; 1237 1238 if (err) 1239 return 2; 1240 1241 /* step 3: make sure arguments are trivially compatible */ 1242 1243 if (cmd->start_arg != 0) { 1244 cmd->start_arg = 0; 1245 err++; 1246 } 1247 if (cmd->convert_src == TRIG_TIMER) { 1248 if (cmd->convert_arg < thisboard->ai_speed) { 1249 cmd->convert_arg = thisboard->ai_speed; 1250 err++; 1251 } 1252 } 1253 if (!cmd->chanlist_len) { 1254 cmd->chanlist_len = 1; 1255 err++; 1256 } 1257 if (cmd->scan_end_arg != cmd->chanlist_len) { 1258 cmd->scan_end_arg = cmd->chanlist_len; 1259 err++; 1260 } 1261 1262 switch (cmd->stop_src) { 1263 case TRIG_COUNT: 1264 if (!cmd->stop_arg) { 1265 cmd->stop_arg = 1; 1266 err++; 1267 } 1268 break; 1269 case TRIG_NONE: 1270 if (cmd->stop_arg != 0) { 1271 cmd->stop_arg = 0; 1272 err++; 1273 } 1274 break; 1275 default: 1276 break; 1277 } 1278 1279 if (err) 1280 return 3; 1281 1282 /* step 4: fix up any arguments */ 1283 1284 if (cmd->convert_src == TRIG_TIMER) { 1285 /* if we are not in burst mode */ 1286 if (cmd->scan_begin_src == TRIG_FOLLOW) { 1287 tmp_arg = cmd->convert_arg; 1288 /* calculate counter values that give desired timing */ 1289 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 1290 &(devpriv->divisor1), 1291 &(devpriv->divisor2), 1292 &(cmd->convert_arg), 1293 cmd-> 1294 flags & TRIG_ROUND_MASK); 1295 if (tmp_arg != cmd->convert_arg) 1296 err++; 1297 } 1298 /* if we are in burst mode */ 1299 else { 1300 /* check that convert_arg is compatible */ 1301 tmp_arg = cmd->convert_arg; 1302 cmd->convert_arg = 1303 burst_convert_arg(cmd->convert_arg, 1304 cmd->flags & TRIG_ROUND_MASK); 1305 if (tmp_arg != cmd->convert_arg) 1306 err++; 1307 1308 if (cmd->scan_begin_src == TRIG_TIMER) { 1309 /* if scans are timed faster than conversion rate allows */ 1310 if (cmd->convert_arg * cmd->chanlist_len > 1311 cmd->scan_begin_arg) { 1312 cmd->scan_begin_arg = 1313 cmd->convert_arg * 1314 cmd->chanlist_len; 1315 err++; 1316 } 1317 tmp_arg = cmd->scan_begin_arg; 1318 /* calculate counter values that give desired timing */ 1319 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 1320 &(devpriv-> 1321 divisor1), 1322 &(devpriv-> 1323 divisor2), 1324 &(cmd-> 1325 scan_begin_arg), 1326 cmd-> 1327 flags & 1328 TRIG_ROUND_MASK); 1329 if (tmp_arg != cmd->scan_begin_arg) 1330 err++; 1331 } 1332 } 1333 } 1334 1335 if (err) 1336 return 4; 1337 1338 /* make sure user is not trying to mix unipolar and bipolar ranges */ 1339 if (cmd->chanlist) { 1340 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR; 1341 for (i = 1; i < cmd->chanlist_len; i++) { 1342 if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) { 1343 comedi_error(dev, 1344 "unipolar and bipolar ranges cannot be mixed in the chanlist"); 1345 err++; 1346 break; 1347 } 1348 } 1349 } 1350 1351 if (err) 1352 return 5; 1353 1354 return 0; 1355} 1356 1357/* analog input cmd interface */ 1358 1359/* first, some utility functions used in the main ai_do_cmd() */ 1360 1361/* returns appropriate bits for control register a, depending on command */ 1362static int control_a_bits(struct comedi_cmd cmd) 1363{ 1364 int control_a; 1365 1366 control_a = FFEN; /* enable fifo */ 1367 if (cmd.stop_src == TRIG_EXT) { 1368 control_a |= ATEN; 1369 } 1370 switch (cmd.start_src) { 1371 case TRIG_EXT: 1372 control_a |= TGEN | CGSL; 1373 break; 1374 case TRIG_NOW: 1375 control_a |= CGEN; 1376 break; 1377 default: 1378 break; 1379 } 1380 1381 return control_a; 1382} 1383 1384/* returns appropriate bits for control register c, depending on command */ 1385static int control_c_bits(struct comedi_cmd cmd) 1386{ 1387 int control_c; 1388 int aref; 1389 1390 /* set clock source to internal or external, select analog reference, 1391 * select unipolar / bipolar 1392 */ 1393 aref = CR_AREF(cmd.chanlist[0]); 1394 control_c = UQEN; /* enable upper qram addresses */ 1395 if (aref != AREF_DIFF) 1396 control_c |= SD; 1397 if (aref == AREF_COMMON) 1398 control_c |= CMEN; 1399 /* if a unipolar range was selected */ 1400 if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR) 1401 control_c |= UB; 1402 switch (cmd.scan_begin_src) { 1403 case TRIG_FOLLOW: /* not in burst mode */ 1404 switch (cmd.convert_src) { 1405 case TRIG_TIMER: 1406 /* trig on cascaded counters */ 1407 control_c |= IPCLK; 1408 break; 1409 case TRIG_EXT: 1410 /* trig on falling edge of external trigger */ 1411 control_c |= XPCLK; 1412 break; 1413 default: 1414 break; 1415 } 1416 break; 1417 case TRIG_TIMER: 1418 /* burst mode with internal pacer clock */ 1419 control_c |= BMDE | IPCLK; 1420 break; 1421 case TRIG_EXT: 1422 /* burst mode with external trigger */ 1423 control_c |= BMDE | XPCLK; 1424 break; 1425 default: 1426 break; 1427 } 1428 1429 return control_c; 1430} 1431 1432/* sets up counters */ 1433static int setup_counters(struct comedi_device *dev, struct comedi_cmd cmd) 1434{ 1435 /* setup cascaded counters for conversion/scan frequency */ 1436 switch (cmd.scan_begin_src) { 1437 case TRIG_FOLLOW: /* not in burst mode */ 1438 if (cmd.convert_src == TRIG_TIMER) { 1439 /* set conversion frequency */ 1440 i8253_cascade_ns_to_timer_2div(TIMER_BASE, 1441 &(devpriv->divisor1), 1442 &(devpriv->divisor2), 1443 &(cmd.convert_arg), 1444 cmd. 1445 flags & TRIG_ROUND_MASK); 1446 if (das1800_set_frequency(dev) < 0) { 1447 return -1; 1448 } 1449 } 1450 break; 1451 case TRIG_TIMER: /* in burst mode */ 1452 /* set scan frequency */ 1453 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1), 1454 &(devpriv->divisor2), 1455 &(cmd.scan_begin_arg), 1456 cmd.flags & TRIG_ROUND_MASK); 1457 if (das1800_set_frequency(dev) < 0) { 1458 return -1; 1459 } 1460 break; 1461 default: 1462 break; 1463 } 1464 1465 /* setup counter 0 for 'about triggering' */ 1466 if (cmd.stop_src == TRIG_EXT) { 1467 /* load counter 0 in mode 0 */ 1468 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0); 1469 } 1470 1471 return 0; 1472} 1473 1474/* sets up dma */ 1475static void setup_dma(struct comedi_device *dev, struct comedi_cmd cmd) 1476{ 1477 unsigned long lock_flags; 1478 const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL; 1479 1480 if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0) 1481 return; 1482 1483 /* determine a reasonable dma transfer size */ 1484 devpriv->dma_transfer_size = suggest_transfer_size(&cmd); 1485 lock_flags = claim_dma_lock(); 1486 disable_dma(devpriv->dma0); 1487 /* clear flip-flop to make sure 2-byte registers for 1488 * count and address get set correctly */ 1489 clear_dma_ff(devpriv->dma0); 1490 set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0)); 1491 /* set appropriate size of transfer */ 1492 set_dma_count(devpriv->dma0, devpriv->dma_transfer_size); 1493 devpriv->dma_current = devpriv->dma0; 1494 devpriv->dma_current_buf = devpriv->ai_buf0; 1495 enable_dma(devpriv->dma0); 1496 /* set up dual dma if appropriate */ 1497 if (dual_dma) { 1498 disable_dma(devpriv->dma1); 1499 /* clear flip-flop to make sure 2-byte registers for 1500 * count and address get set correctly */ 1501 clear_dma_ff(devpriv->dma1); 1502 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1)); 1503 /* set appropriate size of transfer */ 1504 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size); 1505 enable_dma(devpriv->dma1); 1506 } 1507 release_dma_lock(lock_flags); 1508 1509 return; 1510} 1511 1512/* programs channel/gain list into card */ 1513static void program_chanlist(struct comedi_device *dev, struct comedi_cmd cmd) 1514{ 1515 int i, n, chan_range; 1516 unsigned long irq_flags; 1517 const int range_mask = 0x3; /* masks unipolar/bipolar bit off range */ 1518 const int range_bitshift = 8; 1519 1520 n = cmd.chanlist_len; 1521 /* spinlock protects indirect addressing */ 1522 spin_lock_irqsave(&dev->spinlock, irq_flags); 1523 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */ 1524 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*set QRAM address start */ 1525 /* make channel / gain list */ 1526 for (i = 0; i < n; i++) { 1527 chan_range = 1528 CR_CHAN(cmd. 1529 chanlist[i]) | ((CR_RANGE(cmd.chanlist[i]) & 1530 range_mask) << range_bitshift); 1531 outw(chan_range, dev->iobase + DAS1800_QRAM); 1532 } 1533 outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */ 1534 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1535 1536 return; 1537} 1538 1539/* analog input do_cmd */ 1540static int das1800_ai_do_cmd(struct comedi_device *dev, 1541 struct comedi_subdevice *s) 1542{ 1543 int ret; 1544 int control_a, control_c; 1545 struct comedi_async *async = s->async; 1546 struct comedi_cmd cmd = async->cmd; 1547 1548 if (!dev->irq) { 1549 comedi_error(dev, 1550 "no irq assigned for das-1800, cannot do hardware conversions"); 1551 return -1; 1552 } 1553 1554 /* disable dma on TRIG_WAKE_EOS, or TRIG_RT 1555 * (because dma in handler is unsafe at hard real-time priority) */ 1556 if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT)) { 1557 devpriv->irq_dma_bits &= ~DMA_ENABLED; 1558 } else { 1559 devpriv->irq_dma_bits |= devpriv->dma_bits; 1560 } 1561 /* interrupt on end of conversion for TRIG_WAKE_EOS */ 1562 if (cmd.flags & TRIG_WAKE_EOS) { 1563 /* interrupt fifo not empty */ 1564 devpriv->irq_dma_bits &= ~FIMD; 1565 } else { 1566 /* interrupt fifo half full */ 1567 devpriv->irq_dma_bits |= FIMD; 1568 } 1569 /* determine how many conversions we need */ 1570 if (cmd.stop_src == TRIG_COUNT) { 1571 devpriv->count = cmd.stop_arg * cmd.chanlist_len; 1572 } 1573 1574 das1800_cancel(dev, s); 1575 1576 /* determine proper bits for control registers */ 1577 control_a = control_a_bits(cmd); 1578 control_c = control_c_bits(cmd); 1579 1580 /* setup card and start */ 1581 program_chanlist(dev, cmd); 1582 ret = setup_counters(dev, cmd); 1583 if (ret < 0) { 1584 comedi_error(dev, "Error setting up counters"); 1585 return ret; 1586 } 1587 setup_dma(dev, cmd); 1588 outb(control_c, dev->iobase + DAS1800_CONTROL_C); 1589 /* set conversion rate and length for burst mode */ 1590 if (control_c & BMDE) { 1591 /* program conversion period with number of microseconds minus 1 */ 1592 outb(cmd.convert_arg / 1000 - 1, 1593 dev->iobase + DAS1800_BURST_RATE); 1594 outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH); 1595 } 1596 outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B); /* enable irq/dma */ 1597 outb(control_a, dev->iobase + DAS1800_CONTROL_A); /* enable fifo and triggering */ 1598 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */ 1599 1600 return 0; 1601} 1602 1603/* read analog input */ 1604static int das1800_ai_rinsn(struct comedi_device *dev, 1605 struct comedi_subdevice *s, 1606 struct comedi_insn *insn, unsigned int *data) 1607{ 1608 int i, n; 1609 int chan, range, aref, chan_range; 1610 int timeout = 1000; 1611 short dpnt; 1612 int conv_flags = 0; 1613 unsigned long irq_flags; 1614 1615 /* set up analog reference and unipolar / bipolar mode */ 1616 aref = CR_AREF(insn->chanspec); 1617 conv_flags |= UQEN; 1618 if (aref != AREF_DIFF) 1619 conv_flags |= SD; 1620 if (aref == AREF_COMMON) 1621 conv_flags |= CMEN; 1622 /* if a unipolar range was selected */ 1623 if (CR_RANGE(insn->chanspec) & UNIPOLAR) 1624 conv_flags |= UB; 1625 1626 outb(conv_flags, dev->iobase + DAS1800_CONTROL_C); /* software conversion enabled */ 1627 outb(CVEN, dev->iobase + DAS1800_STATUS); /* enable conversions */ 1628 outb(0x0, dev->iobase + DAS1800_CONTROL_A); /* reset fifo */ 1629 outb(FFEN, dev->iobase + DAS1800_CONTROL_A); 1630 1631 chan = CR_CHAN(insn->chanspec); 1632 /* mask of unipolar/bipolar bit from range */ 1633 range = CR_RANGE(insn->chanspec) & 0x3; 1634 chan_range = chan | (range << 8); 1635 spin_lock_irqsave(&dev->spinlock, irq_flags); 1636 outb(QRAM, dev->iobase + DAS1800_SELECT); /* select QRAM for baseAddress + 0x0 */ 1637 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /* set QRAM address start */ 1638 outw(chan_range, dev->iobase + DAS1800_QRAM); 1639 outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS); /*finish write to QRAM */ 1640 outb(ADC, dev->iobase + DAS1800_SELECT); /* select ADC for baseAddress + 0x0 */ 1641 1642 for (n = 0; n < insn->n; n++) { 1643 /* trigger conversion */ 1644 outb(0, dev->iobase + DAS1800_FIFO); 1645 for (i = 0; i < timeout; i++) { 1646 if (inb(dev->iobase + DAS1800_STATUS) & FNE) 1647 break; 1648 } 1649 if (i == timeout) { 1650 comedi_error(dev, "timeout"); 1651 n = -ETIME; 1652 goto exit; 1653 } 1654 dpnt = inw(dev->iobase + DAS1800_FIFO); 1655 /* shift data to offset binary for bipolar ranges */ 1656 if ((conv_flags & UB) == 0) 1657 dpnt += 1 << (thisboard->resolution - 1); 1658 data[n] = dpnt; 1659 } 1660exit: 1661 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1662 1663 return n; 1664} 1665 1666/* writes to an analog output channel */ 1667static int das1800_ao_winsn(struct comedi_device *dev, 1668 struct comedi_subdevice *s, 1669 struct comedi_insn *insn, unsigned int *data) 1670{ 1671 int chan = CR_CHAN(insn->chanspec); 1672/* int range = CR_RANGE(insn->chanspec); */ 1673 int update_chan = thisboard->ao_n_chan - 1; 1674 short output; 1675 unsigned long irq_flags; 1676 1677 /* card expects two's complement data */ 1678 output = data[0] - (1 << (thisboard->resolution - 1)); 1679 /* if the write is to the 'update' channel, we need to remember its value */ 1680 if (chan == update_chan) 1681 devpriv->ao_update_bits = output; 1682 /* write to channel */ 1683 spin_lock_irqsave(&dev->spinlock, irq_flags); 1684 outb(DAC(chan), dev->iobase + DAS1800_SELECT); /* select dac channel for baseAddress + 0x0 */ 1685 outw(output, dev->iobase + DAS1800_DAC); 1686 /* now we need to write to 'update' channel to update all dac channels */ 1687 if (chan != update_chan) { 1688 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT); /* select 'update' channel for baseAddress + 0x0 */ 1689 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC); 1690 } 1691 spin_unlock_irqrestore(&dev->spinlock, irq_flags); 1692 1693 return 1; 1694} 1695 1696/* reads from digital input channels */ 1697static int das1800_di_rbits(struct comedi_device *dev, 1698 struct comedi_subdevice *s, 1699 struct comedi_insn *insn, unsigned int *data) 1700{ 1701 1702 data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf; 1703 data[0] = 0; 1704 1705 return 2; 1706} 1707 1708/* writes to digital output channels */ 1709static int das1800_do_wbits(struct comedi_device *dev, 1710 struct comedi_subdevice *s, 1711 struct comedi_insn *insn, unsigned int *data) 1712{ 1713 unsigned int wbits; 1714 1715 /* only set bits that have been masked */ 1716 data[0] &= (1 << s->n_chan) - 1; 1717 wbits = devpriv->do_bits; 1718 wbits &= ~data[0]; 1719 wbits |= data[0] & data[1]; 1720 devpriv->do_bits = wbits; 1721 1722 outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL); 1723 1724 data[1] = devpriv->do_bits; 1725 1726 return 2; 1727} 1728 1729/* loads counters with divisor1, divisor2 from private structure */ 1730static int das1800_set_frequency(struct comedi_device *dev) 1731{ 1732 int err = 0; 1733 1734 /* counter 1, mode 2 */ 1735 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1, 1736 2)) 1737 err++; 1738 /* counter 2, mode 2 */ 1739 if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2, 1740 2)) 1741 err++; 1742 if (err) 1743 return -1; 1744 1745 return 0; 1746} 1747 1748/* converts requested conversion timing to timing compatible with 1749 * hardware, used only when card is in 'burst mode' 1750 */ 1751static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode) 1752{ 1753 unsigned int micro_sec; 1754 1755 /* in burst mode, the maximum conversion time is 64 microseconds */ 1756 if (convert_arg > 64000) 1757 convert_arg = 64000; 1758 1759 /* the conversion time must be an integral number of microseconds */ 1760 switch (round_mode) { 1761 case TRIG_ROUND_NEAREST: 1762 default: 1763 micro_sec = (convert_arg + 500) / 1000; 1764 break; 1765 case TRIG_ROUND_DOWN: 1766 micro_sec = convert_arg / 1000; 1767 break; 1768 case TRIG_ROUND_UP: 1769 micro_sec = (convert_arg - 1) / 1000 + 1; 1770 break; 1771 } 1772 1773 /* return number of nanoseconds */ 1774 return micro_sec * 1000; 1775} 1776 1777/* utility function that suggests a dma transfer size based on the conversion period 'ns' */ 1778static unsigned int suggest_transfer_size(struct comedi_cmd *cmd) 1779{ 1780 unsigned int size = DMA_BUF_SIZE; 1781 static const int sample_size = 2; /* size in bytes of one sample from board */ 1782 unsigned int fill_time = 300000000; /* target time in nanoseconds for filling dma buffer */ 1783 unsigned int max_size; /* maximum size we will allow for a transfer */ 1784 1785 /* make dma buffer fill in 0.3 seconds for timed modes */ 1786 switch (cmd->scan_begin_src) { 1787 case TRIG_FOLLOW: /* not in burst mode */ 1788 if (cmd->convert_src == TRIG_TIMER) 1789 size = (fill_time / cmd->convert_arg) * sample_size; 1790 break; 1791 case TRIG_TIMER: 1792 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) * 1793 sample_size; 1794 break; 1795 default: 1796 size = DMA_BUF_SIZE; 1797 break; 1798 } 1799 1800 /* set a minimum and maximum size allowed */ 1801 max_size = DMA_BUF_SIZE; 1802 /* if we are taking limited number of conversions, limit transfer size to that */ 1803 if (cmd->stop_src == TRIG_COUNT && 1804 cmd->stop_arg * cmd->chanlist_len * sample_size < max_size) 1805 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size; 1806 1807 if (size > max_size) 1808 size = max_size; 1809 if (size < sample_size) 1810 size = sample_size; 1811 1812 return size; 1813} 1814 1815MODULE_AUTHOR("Comedi http://www.comedi.org"); 1816MODULE_DESCRIPTION("Comedi low-level driver"); 1817MODULE_LICENSE("GPL"); 1818