drivers/staging/comedi/drivers/das1800.c

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