1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * das16.c 4 * DAS16 driver 5 * 6 * COMEDI - Linux Control and Measurement Device Interface 7 * Copyright (C) 2000 David A. Schleef <ds@schleef.org> 8 * Copyright (C) 2000 Chris R. Baugher <baugher@enteract.com> 9 * Copyright (C) 2001,2002 Frank Mori Hess <fmhess@users.sourceforge.net> 10 */ 11 12 /* 13 * Driver: das16 14 * Description: DAS16 compatible boards 15 * Author: Sam Moore, Warren Jasper, ds, Chris Baugher, Frank Hess, Roman Fietze 16 * Devices: [Keithley Metrabyte] DAS-16 (das-16), DAS-16G (das-16g), 17 * DAS-16F (das-16f), DAS-1201 (das-1201), DAS-1202 (das-1202), 18 * DAS-1401 (das-1401), DAS-1402 (das-1402), DAS-1601 (das-1601), 19 * DAS-1602 (das-1602), 20 * [ComputerBoards] PC104-DAS16/JR (pc104-das16jr), 21 * PC104-DAS16JR/16 (pc104-das16jr/16), CIO-DAS16 (cio-das16), 22 * CIO-DAS16F (cio-das16/f), CIO-DAS16/JR (cio-das16/jr), 23 * CIO-DAS16JR/16 (cio-das16jr/16), CIO-DAS1401/12 (cio-das1401/12), 24 * CIO-DAS1402/12 (cio-das1402/12), CIO-DAS1402/16 (cio-das1402/16), 25 * CIO-DAS1601/12 (cio-das1601/12), CIO-DAS1602/12 (cio-das1602/12), 26 * CIO-DAS1602/16 (cio-das1602/16), CIO-DAS16/330 (cio-das16/330) 27 * Status: works 28 * Updated: 2003-10-12 29 * 30 * A rewrite of the das16 and das1600 drivers. 31 * 32 * Options: 33 * [0] - base io address 34 * [1] - irq (does nothing, irq is not used anymore) 35 * [2] - dma channel (optional, required for comedi_command support) 36 * [3] - master clock speed in MHz (optional, 1 or 10, ignored if 37 * board can probe clock, defaults to 1) 38 * [4] - analog input range lowest voltage in microvolts (optional, 39 * only useful if your board does not have software 40 * programmable gain) 41 * [5] - analog input range highest voltage in microvolts (optional, 42 * only useful if board does not have software programmable 43 * gain) 44 * [6] - analog output range lowest voltage in microvolts (optional) 45 * [7] - analog output range highest voltage in microvolts (optional) 46 * 47 * Passing a zero for an option is the same as leaving it unspecified. 48 */ 49 50 /* 51 * Testing and debugging help provided by Daniel Koch. 52 * 53 * Keithley Manuals: 54 * 2309.PDF (das16) 55 * 4919.PDF (das1400, 1600) 56 * 4922.PDF (das-1400) 57 * 4923.PDF (das1200, 1400, 1600) 58 * 59 * Computer boards manuals also available from their website 60 * www.measurementcomputing.com 61 */ 62 63 #include <linux/module.h> 64 #include <linux/slab.h> 65 #include <linux/interrupt.h> 66 #include <linux/comedi/comedidev.h> 67 #include <linux/comedi/comedi_8255.h> 68 #include <linux/comedi/comedi_8254.h> 69 #include <linux/comedi/comedi_isadma.h> 70 71 #define DAS16_DMA_SIZE 0xff00 /* size in bytes of allocated dma buffer */ 72 73 /* 74 * Register I/O map 75 */ 76 #define DAS16_TRIG_REG 0x00 77 #define DAS16_AI_LSB_REG 0x00 78 #define DAS16_AI_MSB_REG 0x01 79 #define DAS16_MUX_REG 0x02 80 #define DAS16_DIO_REG 0x03 81 #define DAS16_AO_LSB_REG(x) ((x) ? 0x06 : 0x04) 82 #define DAS16_AO_MSB_REG(x) ((x) ? 0x07 : 0x05) 83 #define DAS16_STATUS_REG 0x08 84 #define DAS16_STATUS_BUSY BIT(7) 85 #define DAS16_STATUS_UNIPOLAR BIT(6) 86 #define DAS16_STATUS_MUXBIT BIT(5) 87 #define DAS16_STATUS_INT BIT(4) 88 #define DAS16_CTRL_REG 0x09 89 #define DAS16_CTRL_INTE BIT(7) 90 #define DAS16_CTRL_IRQ(x) (((x) & 0x7) << 4) 91 #define DAS16_CTRL_DMAE BIT(2) 92 #define DAS16_CTRL_PACING_MASK (3 << 0) 93 #define DAS16_CTRL_INT_PACER (3 << 0) 94 #define DAS16_CTRL_EXT_PACER (2 << 0) 95 #define DAS16_CTRL_SOFT_PACER (0 << 0) 96 #define DAS16_PACER_REG 0x0a 97 #define DAS16_PACER_BURST_LEN(x) (((x) & 0xf) << 4) 98 #define DAS16_PACER_CTR0 BIT(1) 99 #define DAS16_PACER_TRIG0 BIT(0) 100 #define DAS16_GAIN_REG 0x0b 101 #define DAS16_TIMER_BASE_REG 0x0c /* to 0x0f */ 102 103 #define DAS1600_CONV_REG 0x404 104 #define DAS1600_CONV_DISABLE BIT(6) 105 #define DAS1600_BURST_REG 0x405 106 #define DAS1600_BURST_VAL BIT(6) 107 #define DAS1600_ENABLE_REG 0x406 108 #define DAS1600_ENABLE_VAL BIT(6) 109 #define DAS1600_STATUS_REG 0x407 110 #define DAS1600_STATUS_BME BIT(6) 111 #define DAS1600_STATUS_ME BIT(5) 112 #define DAS1600_STATUS_CD BIT(4) 113 #define DAS1600_STATUS_WS BIT(1) 114 #define DAS1600_STATUS_CLK_10MHZ BIT(0) 115 116 static const struct comedi_lrange range_das1x01_bip = { 117 4, { 118 BIP_RANGE(10), 119 BIP_RANGE(1), 120 BIP_RANGE(0.1), 121 BIP_RANGE(0.01) 122 } 123 }; 124 125 static const struct comedi_lrange range_das1x01_unip = { 126 4, { 127 UNI_RANGE(10), 128 UNI_RANGE(1), 129 UNI_RANGE(0.1), 130 UNI_RANGE(0.01) 131 } 132 }; 133 134 static const struct comedi_lrange range_das1x02_bip = { 135 4, { 136 BIP_RANGE(10), 137 BIP_RANGE(5), 138 BIP_RANGE(2.5), 139 BIP_RANGE(1.25) 140 } 141 }; 142 143 static const struct comedi_lrange range_das1x02_unip = { 144 4, { 145 UNI_RANGE(10), 146 UNI_RANGE(5), 147 UNI_RANGE(2.5), 148 UNI_RANGE(1.25) 149 } 150 }; 151 152 static const struct comedi_lrange range_das16jr = { 153 9, { 154 BIP_RANGE(10), 155 BIP_RANGE(5), 156 BIP_RANGE(2.5), 157 BIP_RANGE(1.25), 158 BIP_RANGE(0.625), 159 UNI_RANGE(10), 160 UNI_RANGE(5), 161 UNI_RANGE(2.5), 162 UNI_RANGE(1.25) 163 } 164 }; 165 166 static const struct comedi_lrange range_das16jr_16 = { 167 8, { 168 BIP_RANGE(10), 169 BIP_RANGE(5), 170 BIP_RANGE(2.5), 171 BIP_RANGE(1.25), 172 UNI_RANGE(10), 173 UNI_RANGE(5), 174 UNI_RANGE(2.5), 175 UNI_RANGE(1.25) 176 } 177 }; 178 179 static const int das16jr_gainlist[] = { 8, 0, 1, 2, 3, 4, 5, 6, 7 }; 180 static const int das16jr_16_gainlist[] = { 0, 1, 2, 3, 4, 5, 6, 7 }; 181 static const int das1600_gainlist[] = { 0, 1, 2, 3 }; 182 183 enum { 184 das16_pg_none = 0, 185 das16_pg_16jr, 186 das16_pg_16jr_16, 187 das16_pg_1601, 188 das16_pg_1602, 189 }; 190 191 static const int *const das16_gainlists[] = { 192 NULL, 193 das16jr_gainlist, 194 das16jr_16_gainlist, 195 das1600_gainlist, 196 das1600_gainlist, 197 }; 198 199 static const struct comedi_lrange *const das16_ai_uni_lranges[] = { 200 &range_unknown, 201 &range_das16jr, 202 &range_das16jr_16, 203 &range_das1x01_unip, 204 &range_das1x02_unip, 205 }; 206 207 static const struct comedi_lrange *const das16_ai_bip_lranges[] = { 208 &range_unknown, 209 &range_das16jr, 210 &range_das16jr_16, 211 &range_das1x01_bip, 212 &range_das1x02_bip, 213 }; 214 215 struct das16_board { 216 const char *name; 217 unsigned int ai_maxdata; 218 unsigned int ai_speed; /* max conversion speed in nanosec */ 219 unsigned int ai_pg; 220 unsigned int has_ao:1; 221 unsigned int has_8255:1; 222 223 unsigned int i8255_offset; 224 225 unsigned int size; 226 unsigned int id; 227 }; 228 229 static const struct das16_board das16_boards[] = { 230 { 231 .name = "das-16", 232 .ai_maxdata = 0x0fff, 233 .ai_speed = 15000, 234 .ai_pg = das16_pg_none, 235 .has_ao = 1, 236 .has_8255 = 1, 237 .i8255_offset = 0x10, 238 .size = 0x14, 239 .id = 0x00, 240 }, { 241 .name = "das-16g", 242 .ai_maxdata = 0x0fff, 243 .ai_speed = 15000, 244 .ai_pg = das16_pg_none, 245 .has_ao = 1, 246 .has_8255 = 1, 247 .i8255_offset = 0x10, 248 .size = 0x14, 249 .id = 0x00, 250 }, { 251 .name = "das-16f", 252 .ai_maxdata = 0x0fff, 253 .ai_speed = 8500, 254 .ai_pg = das16_pg_none, 255 .has_ao = 1, 256 .has_8255 = 1, 257 .i8255_offset = 0x10, 258 .size = 0x14, 259 .id = 0x00, 260 }, { 261 .name = "cio-das16", 262 .ai_maxdata = 0x0fff, 263 .ai_speed = 20000, 264 .ai_pg = das16_pg_none, 265 .has_ao = 1, 266 .has_8255 = 1, 267 .i8255_offset = 0x10, 268 .size = 0x14, 269 .id = 0x80, 270 }, { 271 .name = "cio-das16/f", 272 .ai_maxdata = 0x0fff, 273 .ai_speed = 10000, 274 .ai_pg = das16_pg_none, 275 .has_ao = 1, 276 .has_8255 = 1, 277 .i8255_offset = 0x10, 278 .size = 0x14, 279 .id = 0x80, 280 }, { 281 .name = "cio-das16/jr", 282 .ai_maxdata = 0x0fff, 283 .ai_speed = 7692, 284 .ai_pg = das16_pg_16jr, 285 .size = 0x10, 286 .id = 0x00, 287 }, { 288 .name = "pc104-das16jr", 289 .ai_maxdata = 0x0fff, 290 .ai_speed = 3300, 291 .ai_pg = das16_pg_16jr, 292 .size = 0x10, 293 .id = 0x00, 294 }, { 295 .name = "cio-das16jr/16", 296 .ai_maxdata = 0xffff, 297 .ai_speed = 10000, 298 .ai_pg = das16_pg_16jr_16, 299 .size = 0x10, 300 .id = 0x00, 301 }, { 302 .name = "pc104-das16jr/16", 303 .ai_maxdata = 0xffff, 304 .ai_speed = 10000, 305 .ai_pg = das16_pg_16jr_16, 306 .size = 0x10, 307 .id = 0x00, 308 }, { 309 .name = "das-1201", 310 .ai_maxdata = 0x0fff, 311 .ai_speed = 20000, 312 .ai_pg = das16_pg_none, 313 .has_8255 = 1, 314 .i8255_offset = 0x400, 315 .size = 0x408, 316 .id = 0x20, 317 }, { 318 .name = "das-1202", 319 .ai_maxdata = 0x0fff, 320 .ai_speed = 10000, 321 .ai_pg = das16_pg_none, 322 .has_8255 = 1, 323 .i8255_offset = 0x400, 324 .size = 0x408, 325 .id = 0x20, 326 }, { 327 .name = "das-1401", 328 .ai_maxdata = 0x0fff, 329 .ai_speed = 10000, 330 .ai_pg = das16_pg_1601, 331 .size = 0x408, 332 .id = 0xc0, 333 }, { 334 .name = "das-1402", 335 .ai_maxdata = 0x0fff, 336 .ai_speed = 10000, 337 .ai_pg = das16_pg_1602, 338 .size = 0x408, 339 .id = 0xc0, 340 }, { 341 .name = "das-1601", 342 .ai_maxdata = 0x0fff, 343 .ai_speed = 10000, 344 .ai_pg = das16_pg_1601, 345 .has_ao = 1, 346 .has_8255 = 1, 347 .i8255_offset = 0x400, 348 .size = 0x408, 349 .id = 0xc0, 350 }, { 351 .name = "das-1602", 352 .ai_maxdata = 0x0fff, 353 .ai_speed = 10000, 354 .ai_pg = das16_pg_1602, 355 .has_ao = 1, 356 .has_8255 = 1, 357 .i8255_offset = 0x400, 358 .size = 0x408, 359 .id = 0xc0, 360 }, { 361 .name = "cio-das1401/12", 362 .ai_maxdata = 0x0fff, 363 .ai_speed = 6250, 364 .ai_pg = das16_pg_1601, 365 .size = 0x408, 366 .id = 0xc0, 367 }, { 368 .name = "cio-das1402/12", 369 .ai_maxdata = 0x0fff, 370 .ai_speed = 6250, 371 .ai_pg = das16_pg_1602, 372 .size = 0x408, 373 .id = 0xc0, 374 }, { 375 .name = "cio-das1402/16", 376 .ai_maxdata = 0xffff, 377 .ai_speed = 10000, 378 .ai_pg = das16_pg_1602, 379 .size = 0x408, 380 .id = 0xc0, 381 }, { 382 .name = "cio-das1601/12", 383 .ai_maxdata = 0x0fff, 384 .ai_speed = 6250, 385 .ai_pg = das16_pg_1601, 386 .has_ao = 1, 387 .has_8255 = 1, 388 .i8255_offset = 0x400, 389 .size = 0x408, 390 .id = 0xc0, 391 }, { 392 .name = "cio-das1602/12", 393 .ai_maxdata = 0x0fff, 394 .ai_speed = 10000, 395 .ai_pg = das16_pg_1602, 396 .has_ao = 1, 397 .has_8255 = 1, 398 .i8255_offset = 0x400, 399 .size = 0x408, 400 .id = 0xc0, 401 }, { 402 .name = "cio-das1602/16", 403 .ai_maxdata = 0xffff, 404 .ai_speed = 10000, 405 .ai_pg = das16_pg_1602, 406 .has_ao = 1, 407 .has_8255 = 1, 408 .i8255_offset = 0x400, 409 .size = 0x408, 410 .id = 0xc0, 411 }, { 412 .name = "cio-das16/330", 413 .ai_maxdata = 0x0fff, 414 .ai_speed = 3030, 415 .ai_pg = das16_pg_16jr, 416 .size = 0x14, 417 .id = 0xf0, 418 }, 419 }; 420 421 /* 422 * Period for timer interrupt in jiffies. It's a function 423 * to deal with possibility of dynamic HZ patches 424 */ 425 static inline int timer_period(void) 426 { 427 return HZ / 20; 428 } 429 430 struct das16_private_struct { 431 struct comedi_isadma *dma; 432 struct comedi_device *dev; 433 unsigned int clockbase; 434 unsigned int ctrl_reg; 435 unsigned int divisor1; 436 unsigned int divisor2; 437 struct timer_list timer; 438 unsigned long extra_iobase; 439 unsigned int can_burst:1; 440 unsigned int timer_running:1; 441 }; 442 443 static void das16_ai_setup_dma(struct comedi_device *dev, 444 struct comedi_subdevice *s, 445 unsigned int unread_samples) 446 { 447 struct das16_private_struct *devpriv = dev->private; 448 struct comedi_isadma *dma = devpriv->dma; 449 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma]; 450 unsigned int max_samples = comedi_bytes_to_samples(s, desc->maxsize); 451 unsigned int nsamples; 452 453 /* 454 * Determine dma size based on the buffer size plus the number of 455 * unread samples and the number of samples remaining in the command. 456 */ 457 nsamples = comedi_nsamples_left(s, max_samples + unread_samples); 458 if (nsamples > unread_samples) { 459 nsamples -= unread_samples; 460 desc->size = comedi_samples_to_bytes(s, nsamples); 461 comedi_isadma_program(desc); 462 } 463 } 464 465 static void das16_interrupt(struct comedi_device *dev) 466 { 467 struct das16_private_struct *devpriv = dev->private; 468 struct comedi_subdevice *s = dev->read_subdev; 469 struct comedi_async *async = s->async; 470 struct comedi_cmd *cmd = &async->cmd; 471 struct comedi_isadma *dma = devpriv->dma; 472 struct comedi_isadma_desc *desc = &dma->desc[dma->cur_dma]; 473 unsigned long spin_flags; 474 unsigned int residue; 475 unsigned int nbytes; 476 unsigned int nsamples; 477 478 spin_lock_irqsave(&dev->spinlock, spin_flags); 479 if (!(devpriv->ctrl_reg & DAS16_CTRL_DMAE)) { 480 spin_unlock_irqrestore(&dev->spinlock, spin_flags); 481 return; 482 } 483 484 /* 485 * The pc104-das16jr (at least) has problems if the dma 486 * transfer is interrupted in the middle of transferring 487 * a 16 bit sample. 488 */ 489 residue = comedi_isadma_disable_on_sample(desc->chan, 490 comedi_bytes_per_sample(s)); 491 492 /* figure out how many samples to read */ 493 if (residue > desc->size) { 494 dev_err(dev->class_dev, "residue > transfer size!\n"); 495 async->events |= COMEDI_CB_ERROR; 496 nbytes = 0; 497 } else { 498 nbytes = desc->size - residue; 499 } 500 nsamples = comedi_bytes_to_samples(s, nbytes); 501 502 /* restart DMA if more samples are needed */ 503 if (nsamples) { 504 dma->cur_dma = 1 - dma->cur_dma; 505 das16_ai_setup_dma(dev, s, nsamples); 506 } 507 508 spin_unlock_irqrestore(&dev->spinlock, spin_flags); 509 510 comedi_buf_write_samples(s, desc->virt_addr, nsamples); 511 512 if (cmd->stop_src == TRIG_COUNT && async->scans_done >= cmd->stop_arg) 513 async->events |= COMEDI_CB_EOA; 514 515 comedi_handle_events(dev, s); 516 } 517 518 static void das16_timer_interrupt(struct timer_list *t) 519 { 520 struct das16_private_struct *devpriv = from_timer(devpriv, t, timer); 521 struct comedi_device *dev = devpriv->dev; 522 unsigned long flags; 523 524 das16_interrupt(dev); 525 526 spin_lock_irqsave(&dev->spinlock, flags); 527 if (devpriv->timer_running) 528 mod_timer(&devpriv->timer, jiffies + timer_period()); 529 spin_unlock_irqrestore(&dev->spinlock, flags); 530 } 531 532 static void das16_ai_set_mux_range(struct comedi_device *dev, 533 unsigned int first_chan, 534 unsigned int last_chan, 535 unsigned int range) 536 { 537 const struct das16_board *board = dev->board_ptr; 538 539 /* set multiplexer */ 540 outb(first_chan | (last_chan << 4), dev->iobase + DAS16_MUX_REG); 541 542 /* some boards do not have programmable gain */ 543 if (board->ai_pg == das16_pg_none) 544 return; 545 546 /* 547 * Set gain (this is also burst rate register but according to 548 * computer boards manual, burst rate does nothing, even on 549 * keithley cards). 550 */ 551 outb((das16_gainlists[board->ai_pg])[range], 552 dev->iobase + DAS16_GAIN_REG); 553 } 554 555 static int das16_ai_check_chanlist(struct comedi_device *dev, 556 struct comedi_subdevice *s, 557 struct comedi_cmd *cmd) 558 { 559 unsigned int chan0 = CR_CHAN(cmd->chanlist[0]); 560 unsigned int range0 = CR_RANGE(cmd->chanlist[0]); 561 int i; 562 563 for (i = 1; i < cmd->chanlist_len; i++) { 564 unsigned int chan = CR_CHAN(cmd->chanlist[i]); 565 unsigned int range = CR_RANGE(cmd->chanlist[i]); 566 567 if (chan != ((chan0 + i) % s->n_chan)) { 568 dev_dbg(dev->class_dev, 569 "entries in chanlist must be consecutive channels, counting upwards\n"); 570 return -EINVAL; 571 } 572 573 if (range != range0) { 574 dev_dbg(dev->class_dev, 575 "entries in chanlist must all have the same gain\n"); 576 return -EINVAL; 577 } 578 } 579 580 return 0; 581 } 582 583 static int das16_cmd_test(struct comedi_device *dev, struct comedi_subdevice *s, 584 struct comedi_cmd *cmd) 585 { 586 const struct das16_board *board = dev->board_ptr; 587 struct das16_private_struct *devpriv = dev->private; 588 int err = 0; 589 unsigned int trig_mask; 590 unsigned int arg; 591 592 /* Step 1 : check if triggers are trivially valid */ 593 594 err |= comedi_check_trigger_src(&cmd->start_src, TRIG_NOW); 595 596 trig_mask = TRIG_FOLLOW; 597 if (devpriv->can_burst) 598 trig_mask |= TRIG_TIMER | TRIG_EXT; 599 err |= comedi_check_trigger_src(&cmd->scan_begin_src, trig_mask); 600 601 trig_mask = TRIG_TIMER | TRIG_EXT; 602 if (devpriv->can_burst) 603 trig_mask |= TRIG_NOW; 604 err |= comedi_check_trigger_src(&cmd->convert_src, trig_mask); 605 606 err |= comedi_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT); 607 err |= comedi_check_trigger_src(&cmd->stop_src, TRIG_COUNT | TRIG_NONE); 608 609 if (err) 610 return 1; 611 612 /* Step 2a : make sure trigger sources are unique */ 613 614 err |= comedi_check_trigger_is_unique(cmd->scan_begin_src); 615 err |= comedi_check_trigger_is_unique(cmd->convert_src); 616 err |= comedi_check_trigger_is_unique(cmd->stop_src); 617 618 /* Step 2b : and mutually compatible */ 619 620 /* make sure scan_begin_src and convert_src don't conflict */ 621 if (cmd->scan_begin_src == TRIG_FOLLOW && cmd->convert_src == TRIG_NOW) 622 err |= -EINVAL; 623 if (cmd->scan_begin_src != TRIG_FOLLOW && cmd->convert_src != TRIG_NOW) 624 err |= -EINVAL; 625 626 if (err) 627 return 2; 628 629 /* Step 3: check if arguments are trivially valid */ 630 631 err |= comedi_check_trigger_arg_is(&cmd->start_arg, 0); 632 633 if (cmd->scan_begin_src == TRIG_FOLLOW) /* internal trigger */ 634 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, 0); 635 636 err |= comedi_check_trigger_arg_is(&cmd->scan_end_arg, 637 cmd->chanlist_len); 638 639 /* check against maximum frequency */ 640 if (cmd->scan_begin_src == TRIG_TIMER) { 641 err |= comedi_check_trigger_arg_min(&cmd->scan_begin_arg, 642 board->ai_speed * 643 cmd->chanlist_len); 644 } 645 646 if (cmd->convert_src == TRIG_TIMER) { 647 err |= comedi_check_trigger_arg_min(&cmd->convert_arg, 648 board->ai_speed); 649 } 650 651 if (cmd->stop_src == TRIG_COUNT) 652 err |= comedi_check_trigger_arg_min(&cmd->stop_arg, 1); 653 else /* TRIG_NONE */ 654 err |= comedi_check_trigger_arg_is(&cmd->stop_arg, 0); 655 656 if (err) 657 return 3; 658 659 /* step 4: fix up arguments */ 660 if (cmd->scan_begin_src == TRIG_TIMER) { 661 arg = cmd->scan_begin_arg; 662 comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags); 663 err |= comedi_check_trigger_arg_is(&cmd->scan_begin_arg, arg); 664 } 665 if (cmd->convert_src == TRIG_TIMER) { 666 arg = cmd->convert_arg; 667 comedi_8254_cascade_ns_to_timer(dev->pacer, &arg, cmd->flags); 668 err |= comedi_check_trigger_arg_is(&cmd->convert_arg, arg); 669 } 670 if (err) 671 return 4; 672 673 /* Step 5: check channel list if it exists */ 674 if (cmd->chanlist && cmd->chanlist_len > 0) 675 err |= das16_ai_check_chanlist(dev, s, cmd); 676 677 if (err) 678 return 5; 679 680 return 0; 681 } 682 683 static unsigned int das16_set_pacer(struct comedi_device *dev, unsigned int ns, 684 unsigned int flags) 685 { 686 comedi_8254_cascade_ns_to_timer(dev->pacer, &ns, flags); 687 comedi_8254_update_divisors(dev->pacer); 688 comedi_8254_pacer_enable(dev->pacer, 1, 2, true); 689 690 return ns; 691 } 692 693 static int das16_cmd_exec(struct comedi_device *dev, struct comedi_subdevice *s) 694 { 695 struct das16_private_struct *devpriv = dev->private; 696 struct comedi_isadma *dma = devpriv->dma; 697 struct comedi_async *async = s->async; 698 struct comedi_cmd *cmd = &async->cmd; 699 unsigned int first_chan = CR_CHAN(cmd->chanlist[0]); 700 unsigned int last_chan = CR_CHAN(cmd->chanlist[cmd->chanlist_len - 1]); 701 unsigned int range = CR_RANGE(cmd->chanlist[0]); 702 unsigned int byte; 703 unsigned long flags; 704 705 if (cmd->flags & CMDF_PRIORITY) { 706 dev_err(dev->class_dev, 707 "isa dma transfers cannot be performed with CMDF_PRIORITY, aborting\n"); 708 return -1; 709 } 710 711 if (devpriv->can_burst) 712 outb(DAS1600_CONV_DISABLE, dev->iobase + DAS1600_CONV_REG); 713 714 /* set mux and range for chanlist scan */ 715 das16_ai_set_mux_range(dev, first_chan, last_chan, range); 716 717 /* set counter mode and counts */ 718 cmd->convert_arg = das16_set_pacer(dev, cmd->convert_arg, cmd->flags); 719 720 /* enable counters */ 721 byte = 0; 722 if (devpriv->can_burst) { 723 if (cmd->convert_src == TRIG_NOW) { 724 outb(DAS1600_BURST_VAL, 725 dev->iobase + DAS1600_BURST_REG); 726 /* set burst length */ 727 byte |= DAS16_PACER_BURST_LEN(cmd->chanlist_len - 1); 728 } else { 729 outb(0, dev->iobase + DAS1600_BURST_REG); 730 } 731 } 732 outb(byte, dev->iobase + DAS16_PACER_REG); 733 734 /* set up dma transfer */ 735 dma->cur_dma = 0; 736 das16_ai_setup_dma(dev, s, 0); 737 738 /* set up timer */ 739 spin_lock_irqsave(&dev->spinlock, flags); 740 devpriv->timer_running = 1; 741 devpriv->timer.expires = jiffies + timer_period(); 742 add_timer(&devpriv->timer); 743 744 /* enable DMA interrupt with external or internal pacing */ 745 devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_PACING_MASK); 746 devpriv->ctrl_reg |= DAS16_CTRL_DMAE; 747 if (cmd->convert_src == TRIG_EXT) 748 devpriv->ctrl_reg |= DAS16_CTRL_EXT_PACER; 749 else 750 devpriv->ctrl_reg |= DAS16_CTRL_INT_PACER; 751 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG); 752 753 if (devpriv->can_burst) 754 outb(0, dev->iobase + DAS1600_CONV_REG); 755 spin_unlock_irqrestore(&dev->spinlock, flags); 756 757 return 0; 758 } 759 760 static int das16_cancel(struct comedi_device *dev, struct comedi_subdevice *s) 761 { 762 struct das16_private_struct *devpriv = dev->private; 763 struct comedi_isadma *dma = devpriv->dma; 764 unsigned long flags; 765 766 spin_lock_irqsave(&dev->spinlock, flags); 767 768 /* disable interrupts, dma and pacer clocked conversions */ 769 devpriv->ctrl_reg &= ~(DAS16_CTRL_INTE | DAS16_CTRL_DMAE | 770 DAS16_CTRL_PACING_MASK); 771 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG); 772 773 comedi_isadma_disable(dma->chan); 774 775 /* disable SW timer */ 776 if (devpriv->timer_running) { 777 devpriv->timer_running = 0; 778 del_timer(&devpriv->timer); 779 } 780 781 if (devpriv->can_burst) 782 outb(0, dev->iobase + DAS1600_BURST_REG); 783 784 spin_unlock_irqrestore(&dev->spinlock, flags); 785 786 return 0; 787 } 788 789 static void das16_ai_munge(struct comedi_device *dev, 790 struct comedi_subdevice *s, void *array, 791 unsigned int num_bytes, 792 unsigned int start_chan_index) 793 { 794 unsigned short *data = array; 795 unsigned int num_samples = comedi_bytes_to_samples(s, num_bytes); 796 unsigned int i; 797 __le16 *buf = array; 798 799 for (i = 0; i < num_samples; i++) { 800 data[i] = le16_to_cpu(buf[i]); 801 if (s->maxdata == 0x0fff) 802 data[i] >>= 4; 803 data[i] &= s->maxdata; 804 } 805 } 806 807 static int das16_ai_eoc(struct comedi_device *dev, 808 struct comedi_subdevice *s, 809 struct comedi_insn *insn, 810 unsigned long context) 811 { 812 unsigned int status; 813 814 status = inb(dev->iobase + DAS16_STATUS_REG); 815 if ((status & DAS16_STATUS_BUSY) == 0) 816 return 0; 817 return -EBUSY; 818 } 819 820 static int das16_ai_insn_read(struct comedi_device *dev, 821 struct comedi_subdevice *s, 822 struct comedi_insn *insn, 823 unsigned int *data) 824 { 825 unsigned int chan = CR_CHAN(insn->chanspec); 826 unsigned int range = CR_RANGE(insn->chanspec); 827 unsigned int val; 828 int ret; 829 int i; 830 831 /* set mux and range for single channel */ 832 das16_ai_set_mux_range(dev, chan, chan, range); 833 834 for (i = 0; i < insn->n; i++) { 835 /* trigger conversion */ 836 outb_p(0, dev->iobase + DAS16_TRIG_REG); 837 838 ret = comedi_timeout(dev, s, insn, das16_ai_eoc, 0); 839 if (ret) 840 return ret; 841 842 val = inb(dev->iobase + DAS16_AI_MSB_REG) << 8; 843 val |= inb(dev->iobase + DAS16_AI_LSB_REG); 844 if (s->maxdata == 0x0fff) 845 val >>= 4; 846 val &= s->maxdata; 847 848 data[i] = val; 849 } 850 851 return insn->n; 852 } 853 854 static int das16_ao_insn_write(struct comedi_device *dev, 855 struct comedi_subdevice *s, 856 struct comedi_insn *insn, 857 unsigned int *data) 858 { 859 unsigned int chan = CR_CHAN(insn->chanspec); 860 int i; 861 862 for (i = 0; i < insn->n; i++) { 863 unsigned int val = data[i]; 864 865 s->readback[chan] = val; 866 867 val <<= 4; 868 869 outb(val & 0xff, dev->iobase + DAS16_AO_LSB_REG(chan)); 870 outb((val >> 8) & 0xff, dev->iobase + DAS16_AO_MSB_REG(chan)); 871 } 872 873 return insn->n; 874 } 875 876 static int das16_di_insn_bits(struct comedi_device *dev, 877 struct comedi_subdevice *s, 878 struct comedi_insn *insn, 879 unsigned int *data) 880 { 881 data[1] = inb(dev->iobase + DAS16_DIO_REG) & 0xf; 882 883 return insn->n; 884 } 885 886 static int das16_do_insn_bits(struct comedi_device *dev, 887 struct comedi_subdevice *s, 888 struct comedi_insn *insn, 889 unsigned int *data) 890 { 891 if (comedi_dio_update_state(s, data)) 892 outb(s->state, dev->iobase + DAS16_DIO_REG); 893 894 data[1] = s->state; 895 896 return insn->n; 897 } 898 899 static int das16_probe(struct comedi_device *dev, struct comedi_devconfig *it) 900 { 901 const struct das16_board *board = dev->board_ptr; 902 int diobits; 903 904 /* diobits indicates boards */ 905 diobits = inb(dev->iobase + DAS16_DIO_REG) & 0xf0; 906 if (board->id != diobits) { 907 dev_err(dev->class_dev, 908 "requested board's id bits are incorrect (0x%x != 0x%x)\n", 909 board->id, diobits); 910 return -EINVAL; 911 } 912 913 return 0; 914 } 915 916 static void das16_reset(struct comedi_device *dev) 917 { 918 outb(0, dev->iobase + DAS16_STATUS_REG); 919 outb(0, dev->iobase + DAS16_CTRL_REG); 920 outb(0, dev->iobase + DAS16_PACER_REG); 921 } 922 923 static void das16_alloc_dma(struct comedi_device *dev, unsigned int dma_chan) 924 { 925 struct das16_private_struct *devpriv = dev->private; 926 927 timer_setup(&devpriv->timer, das16_timer_interrupt, 0); 928 929 /* only DMA channels 3 and 1 are valid */ 930 if (!(dma_chan == 1 || dma_chan == 3)) 931 return; 932 933 /* DMA uses two buffers */ 934 devpriv->dma = comedi_isadma_alloc(dev, 2, dma_chan, dma_chan, 935 DAS16_DMA_SIZE, COMEDI_ISADMA_READ); 936 } 937 938 static void das16_free_dma(struct comedi_device *dev) 939 { 940 struct das16_private_struct *devpriv = dev->private; 941 942 if (devpriv) { 943 del_timer_sync(&devpriv->timer); 944 comedi_isadma_free(devpriv->dma); 945 } 946 } 947 948 static const struct comedi_lrange *das16_ai_range(struct comedi_device *dev, 949 struct comedi_subdevice *s, 950 struct comedi_devconfig *it, 951 unsigned int pg_type, 952 unsigned int status) 953 { 954 unsigned int min = it->options[4]; 955 unsigned int max = it->options[5]; 956 957 /* get any user-defined input range */ 958 if (pg_type == das16_pg_none && (min || max)) { 959 struct comedi_lrange *lrange; 960 struct comedi_krange *krange; 961 962 /* allocate single-range range table */ 963 lrange = comedi_alloc_spriv(s, 964 struct_size(lrange, range, 1)); 965 if (!lrange) 966 return &range_unknown; 967 968 /* initialize ai range */ 969 lrange->length = 1; 970 krange = lrange->range; 971 krange->min = min; 972 krange->max = max; 973 krange->flags = UNIT_volt; 974 975 return lrange; 976 } 977 978 /* use software programmable range */ 979 if (status & DAS16_STATUS_UNIPOLAR) 980 return das16_ai_uni_lranges[pg_type]; 981 return das16_ai_bip_lranges[pg_type]; 982 } 983 984 static const struct comedi_lrange *das16_ao_range(struct comedi_device *dev, 985 struct comedi_subdevice *s, 986 struct comedi_devconfig *it) 987 { 988 unsigned int min = it->options[6]; 989 unsigned int max = it->options[7]; 990 991 /* get any user-defined output range */ 992 if (min || max) { 993 struct comedi_lrange *lrange; 994 struct comedi_krange *krange; 995 996 /* allocate single-range range table */ 997 lrange = comedi_alloc_spriv(s, 998 struct_size(lrange, range, 1)); 999 if (!lrange) 1000 return &range_unknown; 1001 1002 /* initialize ao range */ 1003 lrange->length = 1; 1004 krange = lrange->range; 1005 krange->min = min; 1006 krange->max = max; 1007 krange->flags = UNIT_volt; 1008 1009 return lrange; 1010 } 1011 1012 return &range_unknown; 1013 } 1014 1015 static int das16_attach(struct comedi_device *dev, struct comedi_devconfig *it) 1016 { 1017 const struct das16_board *board = dev->board_ptr; 1018 struct das16_private_struct *devpriv; 1019 struct comedi_subdevice *s; 1020 unsigned int osc_base; 1021 unsigned int status; 1022 int ret; 1023 1024 /* check that clock setting is valid */ 1025 if (it->options[3]) { 1026 if (it->options[3] != 1 && it->options[3] != 10) { 1027 dev_err(dev->class_dev, 1028 "Invalid option. Master clock must be set to 1 or 10 (MHz)\n"); 1029 return -EINVAL; 1030 } 1031 } 1032 1033 devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv)); 1034 if (!devpriv) 1035 return -ENOMEM; 1036 devpriv->dev = dev; 1037 1038 if (board->size < 0x400) { 1039 ret = comedi_request_region(dev, it->options[0], board->size); 1040 if (ret) 1041 return ret; 1042 } else { 1043 ret = comedi_request_region(dev, it->options[0], 0x10); 1044 if (ret) 1045 return ret; 1046 /* Request an additional region for the 8255 */ 1047 ret = __comedi_request_region(dev, dev->iobase + 0x400, 1048 board->size & 0x3ff); 1049 if (ret) 1050 return ret; 1051 devpriv->extra_iobase = dev->iobase + 0x400; 1052 devpriv->can_burst = 1; 1053 } 1054 1055 /* probe id bits to make sure they are consistent */ 1056 if (das16_probe(dev, it)) 1057 return -EINVAL; 1058 1059 /* get master clock speed */ 1060 osc_base = I8254_OSC_BASE_1MHZ; 1061 if (devpriv->can_burst) { 1062 status = inb(dev->iobase + DAS1600_STATUS_REG); 1063 if (status & DAS1600_STATUS_CLK_10MHZ) 1064 osc_base = I8254_OSC_BASE_10MHZ; 1065 } else { 1066 if (it->options[3]) 1067 osc_base = I8254_OSC_BASE_1MHZ / it->options[3]; 1068 } 1069 1070 dev->pacer = comedi_8254_init(dev->iobase + DAS16_TIMER_BASE_REG, 1071 osc_base, I8254_IO8, 0); 1072 if (!dev->pacer) 1073 return -ENOMEM; 1074 1075 das16_alloc_dma(dev, it->options[2]); 1076 1077 ret = comedi_alloc_subdevices(dev, 4 + board->has_8255); 1078 if (ret) 1079 return ret; 1080 1081 status = inb(dev->iobase + DAS16_STATUS_REG); 1082 1083 /* Analog Input subdevice */ 1084 s = &dev->subdevices[0]; 1085 s->type = COMEDI_SUBD_AI; 1086 s->subdev_flags = SDF_READABLE; 1087 if (status & DAS16_STATUS_MUXBIT) { 1088 s->subdev_flags |= SDF_GROUND; 1089 s->n_chan = 16; 1090 } else { 1091 s->subdev_flags |= SDF_DIFF; 1092 s->n_chan = 8; 1093 } 1094 s->len_chanlist = s->n_chan; 1095 s->maxdata = board->ai_maxdata; 1096 s->range_table = das16_ai_range(dev, s, it, board->ai_pg, status); 1097 s->insn_read = das16_ai_insn_read; 1098 if (devpriv->dma) { 1099 dev->read_subdev = s; 1100 s->subdev_flags |= SDF_CMD_READ; 1101 s->do_cmdtest = das16_cmd_test; 1102 s->do_cmd = das16_cmd_exec; 1103 s->cancel = das16_cancel; 1104 s->munge = das16_ai_munge; 1105 } 1106 1107 /* Analog Output subdevice */ 1108 s = &dev->subdevices[1]; 1109 if (board->has_ao) { 1110 s->type = COMEDI_SUBD_AO; 1111 s->subdev_flags = SDF_WRITABLE; 1112 s->n_chan = 2; 1113 s->maxdata = 0x0fff; 1114 s->range_table = das16_ao_range(dev, s, it); 1115 s->insn_write = das16_ao_insn_write; 1116 1117 ret = comedi_alloc_subdev_readback(s); 1118 if (ret) 1119 return ret; 1120 } else { 1121 s->type = COMEDI_SUBD_UNUSED; 1122 } 1123 1124 /* Digital Input subdevice */ 1125 s = &dev->subdevices[2]; 1126 s->type = COMEDI_SUBD_DI; 1127 s->subdev_flags = SDF_READABLE; 1128 s->n_chan = 4; 1129 s->maxdata = 1; 1130 s->range_table = &range_digital; 1131 s->insn_bits = das16_di_insn_bits; 1132 1133 /* Digital Output subdevice */ 1134 s = &dev->subdevices[3]; 1135 s->type = COMEDI_SUBD_DO; 1136 s->subdev_flags = SDF_WRITABLE; 1137 s->n_chan = 4; 1138 s->maxdata = 1; 1139 s->range_table = &range_digital; 1140 s->insn_bits = das16_do_insn_bits; 1141 1142 /* initialize digital output lines */ 1143 outb(s->state, dev->iobase + DAS16_DIO_REG); 1144 1145 /* 8255 Digital I/O subdevice */ 1146 if (board->has_8255) { 1147 s = &dev->subdevices[4]; 1148 ret = subdev_8255_init(dev, s, NULL, board->i8255_offset); 1149 if (ret) 1150 return ret; 1151 } 1152 1153 das16_reset(dev); 1154 /* set the interrupt level */ 1155 devpriv->ctrl_reg = DAS16_CTRL_IRQ(dev->irq); 1156 outb(devpriv->ctrl_reg, dev->iobase + DAS16_CTRL_REG); 1157 1158 if (devpriv->can_burst) { 1159 outb(DAS1600_ENABLE_VAL, dev->iobase + DAS1600_ENABLE_REG); 1160 outb(0, dev->iobase + DAS1600_CONV_REG); 1161 outb(0, dev->iobase + DAS1600_BURST_REG); 1162 } 1163 1164 return 0; 1165 } 1166 1167 static void das16_detach(struct comedi_device *dev) 1168 { 1169 const struct das16_board *board = dev->board_ptr; 1170 struct das16_private_struct *devpriv = dev->private; 1171 1172 if (devpriv) { 1173 if (dev->iobase) 1174 das16_reset(dev); 1175 das16_free_dma(dev); 1176 1177 if (devpriv->extra_iobase) 1178 release_region(devpriv->extra_iobase, 1179 board->size & 0x3ff); 1180 } 1181 1182 comedi_legacy_detach(dev); 1183 } 1184 1185 static struct comedi_driver das16_driver = { 1186 .driver_name = "das16", 1187 .module = THIS_MODULE, 1188 .attach = das16_attach, 1189 .detach = das16_detach, 1190 .board_name = &das16_boards[0].name, 1191 .num_names = ARRAY_SIZE(das16_boards), 1192 .offset = sizeof(das16_boards[0]), 1193 }; 1194 module_comedi_driver(das16_driver); 1195 1196 MODULE_AUTHOR("Comedi https://www.comedi.org"); 1197 MODULE_DESCRIPTION("Comedi driver for DAS16 compatible boards"); 1198 MODULE_LICENSE("GPL"); 1199