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 do_bits;            /* digital output bits */
 431         int irq_dma_bits;       /* bits for control register b */
 432         /* dma bits for control register b, stored so that dma can be
 433          * turned on and off */
 434         int dma_bits;
 435         unsigned int dma0;      /* dma channels used */
 436         unsigned int dma1;
 437         volatile unsigned int dma_current;      /* dma channel currently in use */
 438         uint16_t *ai_buf0;      /* pointers to dma buffers */
 439         uint16_t *ai_buf1;
 440         uint16_t *dma_current_buf;      /* pointer to dma buffer currently being used */
 441         unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
 442         unsigned long iobase2;  /* secondary io address used for analog out on 'ao' boards */
 443         short ao_update_bits;   /* remembers the last write to the 'update' dac */
 444 };
 445
 446 /* analog out range for 'ao' boards */
 447 /*
 448 static const struct comedi_lrange range_ao_2 = {
 449         2,
 450         {
 451                 RANGE(-10, 10),
 452                 RANGE(-5, 5),
 453         }
 454 };
 455 */
 456
 457 static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
 458                                             uint16_t sample)
 459 {
 460         const struct das1800_board *thisboard = comedi_board(dev);
 461
 462         sample += 1 << (thisboard->resolution - 1);
 463         return sample;
 464 }
 465
 466 static void munge_data(struct comedi_device *dev, uint16_t * array,
 467                        unsigned int num_elements)
 468 {
 469         unsigned int i;
 470         int unipolar;
 471
 472         /* see if card is using a unipolar or bipolar range so we can munge data correctly */
 473         unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
 474
 475         /* convert to unsigned type if we are in a bipolar mode */
 476         if (!unipolar) {
 477                 for (i = 0; i < num_elements; i++)
 478                         array[i] = munge_bipolar_sample(dev, array[i]);
 479         }
 480 }
 481
 482 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
 483                                           struct comedi_subdevice *s)
 484 {
 485         struct das1800_private *devpriv = dev->private;
 486         int numPoints = 0;      /* number of points to read */
 487         struct comedi_cmd *cmd = &s->async->cmd;
 488
 489         numPoints = FIFO_SIZE / 2;
 490         /* if we only need some of the points */
 491         if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
 492                 numPoints = devpriv->count;
 493         insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
 494         munge_data(dev, devpriv->ai_buf0, numPoints);
 495         cfc_write_array_to_buffer(s, devpriv->ai_buf0,
 496                                   numPoints * sizeof(devpriv->ai_buf0[0]));
 497         if (cmd->stop_src == TRIG_COUNT)
 498                 devpriv->count -= numPoints;
 499         return;
 500 }
 501
 502 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
 503                                           struct comedi_subdevice *s)
 504 {
 505         struct das1800_private *devpriv = dev->private;
 506         short dpnt;
 507         int unipolar;
 508         struct comedi_cmd *cmd = &s->async->cmd;
 509
 510         unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
 511
 512         while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
 513                 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
 514                         break;
 515                 dpnt = inw(dev->iobase + DAS1800_FIFO);
 516                 /* convert to unsigned type if we are in a bipolar mode */
 517                 if (!unipolar)
 518                         ;
 519                 dpnt = munge_bipolar_sample(dev, dpnt);
 520                 cfc_write_to_buffer(s, dpnt);
 521                 if (cmd->stop_src == TRIG_COUNT)
 522                         devpriv->count--;
 523         }
 524
 525         return;
 526 }
 527
 528 /* Utility function used by das1800_flush_dma() and das1800_handle_dma().
 529  * Assumes dma lock is held */
 530 static void das1800_flush_dma_channel(struct comedi_device *dev,
 531                                       struct comedi_subdevice *s,
 532                                       unsigned int channel, uint16_t *buffer)
 533 {
 534         struct das1800_private *devpriv = dev->private;
 535         unsigned int num_bytes, num_samples;
 536         struct comedi_cmd *cmd = &s->async->cmd;
 537
 538         disable_dma(channel);
 539
 540         /* clear flip-flop to make sure 2-byte registers
 541          * get set correctly */
 542         clear_dma_ff(channel);
 543
 544         /*  figure out how many points to read */
 545         num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
 546         num_samples = num_bytes / sizeof(short);
 547
 548         /* if we only need some of the points */
 549         if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
 550                 num_samples = devpriv->count;
 551
 552         munge_data(dev, buffer, num_samples);
 553         cfc_write_array_to_buffer(s, buffer, num_bytes);
 554         if (s->async->cmd.stop_src == TRIG_COUNT)
 555                 devpriv->count -= num_samples;
 556
 557         return;
 558 }
 559
 560 /* flushes remaining data from board when external trigger has stopped acquisition
 561  * and we are using dma transfers */
 562 static void das1800_flush_dma(struct comedi_device *dev,
 563                               struct comedi_subdevice *s)
 564 {
 565         struct das1800_private *devpriv = dev->private;
 566         unsigned long flags;
 567         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
 568
 569         flags = claim_dma_lock();
 570         das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 571                                   devpriv->dma_current_buf);
 572
 573         if (dual_dma) {
 574                 /*  switch to other channel and flush it */
 575                 if (devpriv->dma_current == devpriv->dma0) {
 576                         devpriv->dma_current = devpriv->dma1;
 577                         devpriv->dma_current_buf = devpriv->ai_buf1;
 578                 } else {
 579                         devpriv->dma_current = devpriv->dma0;
 580                         devpriv->dma_current_buf = devpriv->ai_buf0;
 581                 }
 582                 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 583                                           devpriv->dma_current_buf);
 584         }
 585
 586         release_dma_lock(flags);
 587
 588         /*  get any remaining samples in fifo */
 589         das1800_handle_fifo_not_empty(dev, s);
 590
 591         return;
 592 }
 593
 594 static void das1800_handle_dma(struct comedi_device *dev,
 595                                struct comedi_subdevice *s, unsigned int status)
 596 {
 597         struct das1800_private *devpriv = dev->private;
 598         unsigned long flags;
 599         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
 600
 601         flags = claim_dma_lock();
 602         das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 603                                   devpriv->dma_current_buf);
 604         /*  re-enable  dma channel */
 605         set_dma_addr(devpriv->dma_current,
 606                      virt_to_bus(devpriv->dma_current_buf));
 607         set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
 608         enable_dma(devpriv->dma_current);
 609         release_dma_lock(flags);
 610
 611         if (status & DMATC) {
 612                 /*  clear DMATC interrupt bit */
 613                 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
 614                 /*  switch dma channels for next time, if appropriate */
 615                 if (dual_dma) {
 616                         /*  read data from the other channel next time */
 617                         if (devpriv->dma_current == devpriv->dma0) {
 618                                 devpriv->dma_current = devpriv->dma1;
 619                                 devpriv->dma_current_buf = devpriv->ai_buf1;
 620                         } else {
 621                                 devpriv->dma_current = devpriv->dma0;
 622                                 devpriv->dma_current_buf = devpriv->ai_buf0;
 623                         }
 624                 }
 625         }
 626
 627         return;
 628 }
 629
 630 static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
 631 {
 632         struct das1800_private *devpriv = dev->private;
 633
 634         outb(0x0, dev->iobase + DAS1800_STATUS);        /* disable conversions */
 635         outb(0x0, dev->iobase + DAS1800_CONTROL_B);     /* disable interrupts and dma */
 636         outb(0x0, dev->iobase + DAS1800_CONTROL_A);     /* disable and clear fifo and stop triggering */
 637         if (devpriv->dma0)
 638                 disable_dma(devpriv->dma0);
 639         if (devpriv->dma1)
 640                 disable_dma(devpriv->dma1);
 641         return 0;
 642 }
 643
 644 /* the guts of the interrupt handler, that is shared with das1800_ai_poll */
 645 static void das1800_ai_handler(struct comedi_device *dev)
 646 {
 647         struct das1800_private *devpriv = dev->private;
 648         struct comedi_subdevice *s = &dev->subdevices[0];
 649         struct comedi_async *async = s->async;
 650         struct comedi_cmd *cmd = &async->cmd;
 651         unsigned int status = inb(dev->iobase + DAS1800_STATUS);
 652
 653         async->events = 0;
 654         /*  select adc for base address + 0 */
 655         outb(ADC, dev->iobase + DAS1800_SELECT);
 656         /*  dma buffer full */
 657         if (devpriv->irq_dma_bits & DMA_ENABLED) {
 658                 /*  look for data from dma transfer even if dma terminal count hasn't happened yet */
 659                 das1800_handle_dma(dev, s, status);
 660         } else if (status & FHF) {      /*  if fifo half full */
 661                 das1800_handle_fifo_half_full(dev, s);
 662         } else if (status & FNE) {      /*  if fifo not empty */
 663                 das1800_handle_fifo_not_empty(dev, s);
 664         }
 665
 666         async->events |= COMEDI_CB_BLOCK;
 667         /* if the card's fifo has overflowed */
 668         if (status & OVF) {
 669                 /*  clear OVF interrupt bit */
 670                 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
 671                 comedi_error(dev, "DAS1800 FIFO overflow");
 672                 das1800_cancel(dev, s);
 673                 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
 674                 comedi_event(dev, s);
 675                 return;
 676         }
 677         /*  stop taking data if appropriate */
 678         /* stop_src TRIG_EXT */
 679         if (status & CT0TC) {
 680                 /*  clear CT0TC interrupt bit */
 681                 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
 682                 /*  make sure we get all remaining data from board before quitting */
 683                 if (devpriv->irq_dma_bits & DMA_ENABLED)
 684                         das1800_flush_dma(dev, s);
 685                 else
 686                         das1800_handle_fifo_not_empty(dev, s);
 687                 das1800_cancel(dev, s); /* disable hardware conversions */
 688                 async->events |= COMEDI_CB_EOA;
 689         } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) {        /*  stop_src TRIG_COUNT */
 690                 das1800_cancel(dev, s); /* disable hardware conversions */
 691                 async->events |= COMEDI_CB_EOA;
 692         }
 693
 694         comedi_event(dev, s);
 695
 696         return;
 697 }
 698
 699 static int das1800_ai_poll(struct comedi_device *dev,
 700                            struct comedi_subdevice *s)
 701 {
 702         unsigned long flags;
 703
 704         /*  prevent race with interrupt handler */
 705         spin_lock_irqsave(&dev->spinlock, flags);
 706         das1800_ai_handler(dev);
 707         spin_unlock_irqrestore(&dev->spinlock, flags);
 708
 709         return s->async->buf_write_count - s->async->buf_read_count;
 710 }
 711
 712 static irqreturn_t das1800_interrupt(int irq, void *d)
 713 {
 714         struct comedi_device *dev = d;
 715         unsigned int status;
 716
 717         if (!dev->attached) {
 718                 comedi_error(dev, "premature interrupt");
 719                 return IRQ_HANDLED;
 720         }
 721
 722         /* Prevent race with das1800_ai_poll() on multi processor systems.
 723          * Also protects indirect addressing in das1800_ai_handler */
 724         spin_lock(&dev->spinlock);
 725         status = inb(dev->iobase + DAS1800_STATUS);
 726
 727         /* if interrupt was not caused by das-1800 */
 728         if (!(status & INT)) {
 729                 spin_unlock(&dev->spinlock);
 730                 return IRQ_NONE;
 731         }
 732         /* clear the interrupt status bit INT */
 733         outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
 734         /*  handle interrupt */
 735         das1800_ai_handler(dev);
 736
 737         spin_unlock(&dev->spinlock);
 738         return IRQ_HANDLED;
 739 }
 740
 741 /* converts requested conversion timing to timing compatible with
 742  * hardware, used only when card is in 'burst mode'
 743  */
 744 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
 745 {
 746         unsigned int micro_sec;
 747
 748         /*  in burst mode, the maximum conversion time is 64 microseconds */
 749         if (convert_arg > 64000)
 750                 convert_arg = 64000;
 751
 752         /*  the conversion time must be an integral number of microseconds */
 753         switch (round_mode) {
 754         case TRIG_ROUND_NEAREST:
 755         default:
 756                 micro_sec = (convert_arg + 500) / 1000;
 757                 break;
 758         case TRIG_ROUND_DOWN:
 759                 micro_sec = convert_arg / 1000;
 760                 break;
 761         case TRIG_ROUND_UP:
 762                 micro_sec = (convert_arg - 1) / 1000 + 1;
 763                 break;
 764         }
 765
 766         /*  return number of nanoseconds */
 767         return micro_sec * 1000;
 768 }
 769
 770 /* test analog input cmd */
 771 static int das1800_ai_do_cmdtest(struct comedi_device *dev,
 772                                  struct comedi_subdevice *s,
 773                                  struct comedi_cmd *cmd)
 774 {
 775         const struct das1800_board *thisboard = comedi_board(dev);
 776         struct das1800_private *devpriv = dev->private;
 777         int err = 0;
 778         unsigned int tmp_arg;
 779         int i;
 780         int unipolar;
 781
 782         /* Step 1 : check if triggers are trivially valid */
 783
 784         err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT);
 785         err |= cfc_check_trigger_src(&cmd->scan_begin_src,
 786                                         TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT);
 787         err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER | TRIG_EXT);
 788         err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
 789         err |= cfc_check_trigger_src(&cmd->stop_src,
 790                                         TRIG_COUNT | TRIG_EXT | TRIG_NONE);
 791
 792         if (err)
 793                 return 1;
 794
 795         /* Step 2a : make sure trigger sources are unique */
 796
 797         err |= cfc_check_trigger_is_unique(cmd->start_src);
 798         err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
 799         err |= cfc_check_trigger_is_unique(cmd->convert_src);
 800         err |= cfc_check_trigger_is_unique(cmd->stop_src);
 801
 802         /* Step 2b : and mutually compatible */
 803
 804         if (cmd->scan_begin_src != TRIG_FOLLOW &&
 805             cmd->convert_src != TRIG_TIMER)
 806                 err |= -EINVAL;
 807
 808         if (err)
 809                 return 2;
 810
 811         /* Step 3: check if arguments are trivially valid */
 812
 813         err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
 814
 815         if (cmd->convert_src == TRIG_TIMER)
 816                 err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
 817                                                  thisboard->ai_speed);
 818
 819         err |= cfc_check_trigger_arg_min(&cmd->chanlist_len, 1);
 820         err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
 821
 822         switch (cmd->stop_src) {
 823         case TRIG_COUNT:
 824                 err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
 825                 break;
 826         case TRIG_NONE:
 827                 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
 828                 break;
 829         default:
 830                 break;
 831         }
 832
 833         if (err)
 834                 return 3;
 835
 836         /* step 4: fix up any arguments */
 837
 838         if (cmd->convert_src == TRIG_TIMER) {
 839                 /*  if we are not in burst mode */
 840                 if (cmd->scan_begin_src == TRIG_FOLLOW) {
 841                         tmp_arg = cmd->convert_arg;
 842                         /* calculate counter values that give desired timing */
 843                         i8253_cascade_ns_to_timer_2div(TIMER_BASE,
 844                                                        &(devpriv->divisor1),
 845                                                        &(devpriv->divisor2),
 846                                                        &(cmd->convert_arg),
 847                                                        cmd->
 848                                                        flags & TRIG_ROUND_MASK);
 849                         if (tmp_arg != cmd->convert_arg)
 850                                 err++;
 851                 }
 852                 /*  if we are in burst mode */
 853                 else {
 854                         /*  check that convert_arg is compatible */
 855                         tmp_arg = cmd->convert_arg;
 856                         cmd->convert_arg =
 857                             burst_convert_arg(cmd->convert_arg,
 858                                               cmd->flags & TRIG_ROUND_MASK);
 859                         if (tmp_arg != cmd->convert_arg)
 860                                 err++;
 861
 862                         if (cmd->scan_begin_src == TRIG_TIMER) {
 863                                 /*  if scans are timed faster than conversion rate allows */
 864                                 if (cmd->convert_arg * cmd->chanlist_len >
 865                                     cmd->scan_begin_arg) {
 866                                         cmd->scan_begin_arg =
 867                                             cmd->convert_arg *
 868                                             cmd->chanlist_len;
 869                                         err++;
 870                                 }
 871                                 tmp_arg = cmd->scan_begin_arg;
 872                                 /* calculate counter values that give desired timing */
 873                                 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
 874                                                                &(devpriv->
 875                                                                  divisor1),
 876                                                                &(devpriv->
 877                                                                  divisor2),
 878                                                                &(cmd->
 879                                                                  scan_begin_arg),
 880                                                                cmd->
 881                                                                flags &
 882                                                                TRIG_ROUND_MASK);
 883                                 if (tmp_arg != cmd->scan_begin_arg)
 884                                         err++;
 885                         }
 886                 }
 887         }
 888
 889         if (err)
 890                 return 4;
 891
 892         /*  make sure user is not trying to mix unipolar and bipolar ranges */
 893         if (cmd->chanlist) {
 894                 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
 895                 for (i = 1; i < cmd->chanlist_len; i++) {
 896                         if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
 897                                 comedi_error(dev,
 898                                              "unipolar and bipolar ranges cannot be mixed in the chanlist");
 899                                 err++;
 900                                 break;
 901                         }
 902                 }
 903         }
 904
 905         if (err)
 906                 return 5;
 907
 908         return 0;
 909 }
 910
 911 /* returns appropriate bits for control register a, depending on command */
 912 static int control_a_bits(const struct comedi_cmd *cmd)
 913 {
 914         int control_a;
 915
 916         control_a = FFEN;       /* enable fifo */
 917         if (cmd->stop_src == TRIG_EXT)
 918                 control_a |= ATEN;
 919         switch (cmd->start_src) {
 920         case TRIG_EXT:
 921                 control_a |= TGEN | CGSL;
 922                 break;
 923         case TRIG_NOW:
 924                 control_a |= CGEN;
 925                 break;
 926         default:
 927                 break;
 928         }
 929
 930         return control_a;
 931 }
 932
 933 /* returns appropriate bits for control register c, depending on command */
 934 static int control_c_bits(const struct comedi_cmd *cmd)
 935 {
 936         int control_c;
 937         int aref;
 938
 939         /* set clock source to internal or external, select analog reference,
 940          * select unipolar / bipolar
 941          */
 942         aref = CR_AREF(cmd->chanlist[0]);
 943         control_c = UQEN;       /* enable upper qram addresses */
 944         if (aref != AREF_DIFF)
 945                 control_c |= SD;
 946         if (aref == AREF_COMMON)
 947                 control_c |= CMEN;
 948         /* if a unipolar range was selected */
 949         if (CR_RANGE(cmd->chanlist[0]) & UNIPOLAR)
 950                 control_c |= UB;
 951         switch (cmd->scan_begin_src) {
 952         case TRIG_FOLLOW:       /*  not in burst mode */
 953                 switch (cmd->convert_src) {
 954                 case TRIG_TIMER:
 955                         /* trig on cascaded counters */
 956                         control_c |= IPCLK;
 957                         break;
 958                 case TRIG_EXT:
 959                         /* trig on falling edge of external trigger */
 960                         control_c |= XPCLK;
 961                         break;
 962                 default:
 963                         break;
 964                 }
 965                 break;
 966         case TRIG_TIMER:
 967                 /*  burst mode with internal pacer clock */
 968                 control_c |= BMDE | IPCLK;
 969                 break;
 970         case TRIG_EXT:
 971                 /*  burst mode with external trigger */
 972                 control_c |= BMDE | XPCLK;
 973                 break;
 974         default:
 975                 break;
 976         }
 977
 978         return control_c;
 979 }
 980
 981 /* loads counters with divisor1, divisor2 from private structure */
 982 static int das1800_set_frequency(struct comedi_device *dev)
 983 {
 984         struct das1800_private *devpriv = dev->private;
 985         int err = 0;
 986
 987         /*  counter 1, mode 2 */
 988         if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
 989                        2))
 990                 err++;
 991         /*  counter 2, mode 2 */
 992         if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
 993                        2))
 994                 err++;
 995         if (err)
 996                 return -1;
 997
 998         return 0;
 999 }
1000
1001 /* sets up counters */
1002 static int setup_counters(struct comedi_device *dev,
1003                           const struct comedi_cmd *cmd)
1004 {
1005         struct das1800_private *devpriv = dev->private;
1006         unsigned int period;
1007
1008         /*  setup cascaded counters for conversion/scan frequency */
1009         switch (cmd->scan_begin_src) {
1010         case TRIG_FOLLOW:       /*  not in burst mode */
1011                 if (cmd->convert_src == TRIG_TIMER) {
1012                         /* set conversion frequency */
1013                         period = cmd->convert_arg;
1014                         i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1015                                                        &devpriv->divisor1,
1016                                                        &devpriv->divisor2,
1017                                                        &period,
1018                                                        cmd->flags &
1019                                                         TRIG_ROUND_MASK);
1020                         if (das1800_set_frequency(dev) < 0)
1021                                 return -1;
1022                 }
1023                 break;
1024         case TRIG_TIMER:        /*  in burst mode */
1025                 /* set scan frequency */
1026                 period = cmd->scan_begin_arg;
1027                 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &devpriv->divisor1,
1028                                                &devpriv->divisor2, &period,
1029                                                cmd->flags & TRIG_ROUND_MASK);
1030                 if (das1800_set_frequency(dev) < 0)
1031                         return -1;
1032                 break;
1033         default:
1034                 break;
1035         }
1036
1037         /*  setup counter 0 for 'about triggering' */
1038         if (cmd->stop_src == TRIG_EXT) {
1039                 /*  load counter 0 in mode 0 */
1040                 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1041         }
1042
1043         return 0;
1044 }
1045
1046 /* utility function that suggests a dma transfer size based on the conversion period 'ns' */
1047 static unsigned int suggest_transfer_size(const struct comedi_cmd *cmd)
1048 {
1049         unsigned int size = DMA_BUF_SIZE;
1050         static const int sample_size = 2;       /*  size in bytes of one sample from board */
1051         unsigned int fill_time = 300000000;     /*  target time in nanoseconds for filling dma buffer */
1052         unsigned int max_size;  /*  maximum size we will allow for a transfer */
1053
1054         /*  make dma buffer fill in 0.3 seconds for timed modes */
1055         switch (cmd->scan_begin_src) {
1056         case TRIG_FOLLOW:       /*  not in burst mode */
1057                 if (cmd->convert_src == TRIG_TIMER)
1058                         size = (fill_time / cmd->convert_arg) * sample_size;
1059                 break;
1060         case TRIG_TIMER:
1061                 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
1062                     sample_size;
1063                 break;
1064         default:
1065                 size = DMA_BUF_SIZE;
1066                 break;
1067         }
1068
1069         /*  set a minimum and maximum size allowed */
1070         max_size = DMA_BUF_SIZE;
1071         /*  if we are taking limited number of conversions, limit transfer size to that */
1072         if (cmd->stop_src == TRIG_COUNT &&
1073             cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
1074                 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1075
1076         if (size > max_size)
1077                 size = max_size;
1078         if (size < sample_size)
1079                 size = sample_size;
1080
1081         return size;
1082 }
1083
1084 /* sets up dma */
1085 static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd)
1086 {
1087         struct das1800_private *devpriv = dev->private;
1088         unsigned long lock_flags;
1089         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1090
1091         if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1092                 return;
1093
1094         /* determine a reasonable dma transfer size */
1095         devpriv->dma_transfer_size = suggest_transfer_size(cmd);
1096         lock_flags = claim_dma_lock();
1097         disable_dma(devpriv->dma0);
1098         /* clear flip-flop to make sure 2-byte registers for
1099          * count and address get set correctly */
1100         clear_dma_ff(devpriv->dma0);
1101         set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
1102         /*  set appropriate size of transfer */
1103         set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1104         devpriv->dma_current = devpriv->dma0;
1105         devpriv->dma_current_buf = devpriv->ai_buf0;
1106         enable_dma(devpriv->dma0);
1107         /*  set up dual dma if appropriate */
1108         if (dual_dma) {
1109                 disable_dma(devpriv->dma1);
1110                 /* clear flip-flop to make sure 2-byte registers for
1111                  * count and address get set correctly */
1112                 clear_dma_ff(devpriv->dma1);
1113                 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
1114                 /*  set appropriate size of transfer */
1115                 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1116                 enable_dma(devpriv->dma1);
1117         }
1118         release_dma_lock(lock_flags);
1119
1120         return;
1121 }
1122
1123 /* programs channel/gain list into card */
1124 static void program_chanlist(struct comedi_device *dev,
1125                              const struct comedi_cmd *cmd)
1126 {
1127         int i, n, chan_range;
1128         unsigned long irq_flags;
1129         const int range_mask = 0x3;     /* masks unipolar/bipolar bit off range */
1130         const int range_bitshift = 8;
1131
1132         n = cmd->chanlist_len;
1133         /*  spinlock protects indirect addressing */
1134         spin_lock_irqsave(&dev->spinlock, irq_flags);
1135         outb(QRAM, dev->iobase + DAS1800_SELECT);       /* select QRAM for baseAddress + 0x0 */
1136         outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);        /*set QRAM address start */
1137         /* make channel / gain list */
1138         for (i = 0; i < n; i++) {
1139                 chan_range =
1140                     CR_CHAN(cmd->chanlist[i]) |
1141                     ((CR_RANGE(cmd->chanlist[i]) & range_mask) <<
1142                      range_bitshift);
1143                 outw(chan_range, dev->iobase + DAS1800_QRAM);
1144         }
1145         outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);        /*finish write to QRAM */
1146         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1147
1148         return;
1149 }
1150
1151 /* analog input do_cmd */
1152 static int das1800_ai_do_cmd(struct comedi_device *dev,
1153                              struct comedi_subdevice *s)
1154 {
1155         struct das1800_private *devpriv = dev->private;
1156         int ret;
1157         int control_a, control_c;
1158         struct comedi_async *async = s->async;
1159         const struct comedi_cmd *cmd = &async->cmd;
1160
1161         if (!dev->irq) {
1162                 comedi_error(dev,
1163                              "no irq assigned for das-1800, cannot do hardware conversions");
1164                 return -1;
1165         }
1166
1167         /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1168          * (because dma in handler is unsafe at hard real-time priority) */
1169         if (cmd->flags & (TRIG_WAKE_EOS | TRIG_RT))
1170                 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1171         else
1172                 devpriv->irq_dma_bits |= devpriv->dma_bits;
1173         /*  interrupt on end of conversion for TRIG_WAKE_EOS */
1174         if (cmd->flags & TRIG_WAKE_EOS) {
1175                 /*  interrupt fifo not empty */
1176                 devpriv->irq_dma_bits &= ~FIMD;
1177         } else {
1178                 /*  interrupt fifo half full */
1179                 devpriv->irq_dma_bits |= FIMD;
1180         }
1181         /*  determine how many conversions we need */
1182         if (cmd->stop_src == TRIG_COUNT)
1183                 devpriv->count = cmd->stop_arg * cmd->chanlist_len;
1184
1185         das1800_cancel(dev, s);
1186
1187         /*  determine proper bits for control registers */
1188         control_a = control_a_bits(cmd);
1189         control_c = control_c_bits(cmd);
1190
1191         /* setup card and start */
1192         program_chanlist(dev, cmd);
1193         ret = setup_counters(dev, cmd);
1194         if (ret < 0) {
1195                 comedi_error(dev, "Error setting up counters");
1196                 return ret;
1197         }
1198         setup_dma(dev, cmd);
1199         outb(control_c, dev->iobase + DAS1800_CONTROL_C);
1200         /*  set conversion rate and length for burst mode */
1201         if (control_c & BMDE) {
1202                 /*  program conversion period with number of microseconds minus 1 */
1203                 outb(cmd->convert_arg / 1000 - 1,
1204                      dev->iobase + DAS1800_BURST_RATE);
1205                 outb(cmd->chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1206         }
1207         outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B);   /*  enable irq/dma */
1208         outb(control_a, dev->iobase + DAS1800_CONTROL_A);       /* enable fifo and triggering */
1209         outb(CVEN, dev->iobase + DAS1800_STATUS);       /* enable conversions */
1210
1211         return 0;
1212 }
1213
1214 /* read analog input */
1215 static int das1800_ai_rinsn(struct comedi_device *dev,
1216                             struct comedi_subdevice *s,
1217                             struct comedi_insn *insn, unsigned int *data)
1218 {
1219         const struct das1800_board *thisboard = comedi_board(dev);
1220         int i, n;
1221         int chan, range, aref, chan_range;
1222         int timeout = 1000;
1223         short dpnt;
1224         int conv_flags = 0;
1225         unsigned long irq_flags;
1226
1227         /* set up analog reference and unipolar / bipolar mode */
1228         aref = CR_AREF(insn->chanspec);
1229         conv_flags |= UQEN;
1230         if (aref != AREF_DIFF)
1231                 conv_flags |= SD;
1232         if (aref == AREF_COMMON)
1233                 conv_flags |= CMEN;
1234         /* if a unipolar range was selected */
1235         if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1236                 conv_flags |= UB;
1237
1238         outb(conv_flags, dev->iobase + DAS1800_CONTROL_C);      /* software conversion enabled */
1239         outb(CVEN, dev->iobase + DAS1800_STATUS);       /* enable conversions */
1240         outb(0x0, dev->iobase + DAS1800_CONTROL_A);     /* reset fifo */
1241         outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1242
1243         chan = CR_CHAN(insn->chanspec);
1244         /* mask of unipolar/bipolar bit from range */
1245         range = CR_RANGE(insn->chanspec) & 0x3;
1246         chan_range = chan | (range << 8);
1247         spin_lock_irqsave(&dev->spinlock, irq_flags);
1248         outb(QRAM, dev->iobase + DAS1800_SELECT);       /* select QRAM for baseAddress + 0x0 */
1249         outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);  /* set QRAM address start */
1250         outw(chan_range, dev->iobase + DAS1800_QRAM);
1251         outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);  /*finish write to QRAM */
1252         outb(ADC, dev->iobase + DAS1800_SELECT);        /* select ADC for baseAddress + 0x0 */
1253
1254         for (n = 0; n < insn->n; n++) {
1255                 /* trigger conversion */
1256                 outb(0, dev->iobase + DAS1800_FIFO);
1257                 for (i = 0; i < timeout; i++) {
1258                         if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1259                                 break;
1260                 }
1261                 if (i == timeout) {
1262                         comedi_error(dev, "timeout");
1263                         n = -ETIME;
1264                         goto exit;
1265                 }
1266                 dpnt = inw(dev->iobase + DAS1800_FIFO);
1267                 /* shift data to offset binary for bipolar ranges */
1268                 if ((conv_flags & UB) == 0)
1269                         dpnt += 1 << (thisboard->resolution - 1);
1270                 data[n] = dpnt;
1271         }
1272 exit:
1273         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1274
1275         return n;
1276 }
1277
1278 /* writes to an analog output channel */
1279 static int das1800_ao_winsn(struct comedi_device *dev,
1280                             struct comedi_subdevice *s,
1281                             struct comedi_insn *insn, unsigned int *data)
1282 {
1283         const struct das1800_board *thisboard = comedi_board(dev);
1284         struct das1800_private *devpriv = dev->private;
1285         int chan = CR_CHAN(insn->chanspec);
1286 /* int range = CR_RANGE(insn->chanspec); */
1287         int update_chan = thisboard->ao_n_chan - 1;
1288         short output;
1289         unsigned long irq_flags;
1290
1291         /*   card expects two's complement data */
1292         output = data[0] - (1 << (thisboard->resolution - 1));
1293         /*  if the write is to the 'update' channel, we need to remember its value */
1294         if (chan == update_chan)
1295                 devpriv->ao_update_bits = output;
1296         /*  write to channel */
1297         spin_lock_irqsave(&dev->spinlock, irq_flags);
1298         outb(DAC(chan), dev->iobase + DAS1800_SELECT);  /* select dac channel for baseAddress + 0x0 */
1299         outw(output, dev->iobase + DAS1800_DAC);
1300         /*  now we need to write to 'update' channel to update all dac channels */
1301         if (chan != update_chan) {
1302                 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT);   /* select 'update' channel for baseAddress + 0x0 */
1303                 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1304         }
1305         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1306
1307         return 1;
1308 }
1309
1310 /* reads from digital input channels */
1311 static int das1800_di_rbits(struct comedi_device *dev,
1312                             struct comedi_subdevice *s,
1313                             struct comedi_insn *insn, unsigned int *data)
1314 {
1315
1316         data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1317         data[0] = 0;
1318
1319         return insn->n;
1320 }
1321
1322 /* writes to digital output channels */
1323 static int das1800_do_wbits(struct comedi_device *dev,
1324                             struct comedi_subdevice *s,
1325                             struct comedi_insn *insn, unsigned int *data)
1326 {
1327         struct das1800_private *devpriv = dev->private;
1328         unsigned int wbits;
1329
1330         /*  only set bits that have been masked */
1331         data[0] &= (1 << s->n_chan) - 1;
1332         wbits = devpriv->do_bits;
1333         wbits &= ~data[0];
1334         wbits |= data[0] & data[1];
1335         devpriv->do_bits = wbits;
1336
1337         outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1338
1339         data[1] = devpriv->do_bits;
1340
1341         return insn->n;
1342 }
1343
1344 static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
1345                             unsigned int dma1)
1346 {
1347         struct das1800_private *devpriv = dev->private;
1348         unsigned long flags;
1349
1350         /*  need an irq to do dma */
1351         if (dev->irq && dma0) {
1352                 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
1353                 switch ((dma0 & 0x7) | (dma1 << 4)) {
1354                 case 0x5:       /*  dma0 == 5 */
1355                         devpriv->dma_bits |= DMA_CH5;
1356                         break;
1357                 case 0x6:       /*  dma0 == 6 */
1358                         devpriv->dma_bits |= DMA_CH6;
1359                         break;
1360                 case 0x7:       /*  dma0 == 7 */
1361                         devpriv->dma_bits |= DMA_CH7;
1362                         break;
1363                 case 0x65:      /*  dma0 == 5, dma1 == 6 */
1364                         devpriv->dma_bits |= DMA_CH5_CH6;
1365                         break;
1366                 case 0x76:      /*  dma0 == 6, dma1 == 7 */
1367                         devpriv->dma_bits |= DMA_CH6_CH7;
1368                         break;
1369                 case 0x57:      /*  dma0 == 7, dma1 == 5 */
1370                         devpriv->dma_bits |= DMA_CH7_CH5;
1371                         break;
1372                 default:
1373                         dev_err(dev->class_dev,
1374                                 "only supports dma channels 5 through 7\n");
1375                         dev_err(dev->class_dev,
1376                                 "Dual dma only allows the following combinations:\n");
1377                         dev_err(dev->class_dev,
1378                                 "dma 5,6 / 6,7 / or 7,5\n");
1379                         return -EINVAL;
1380                         break;
1381                 }
1382                 if (request_dma(dma0, dev->driver->driver_name)) {
1383                         dev_err(dev->class_dev,
1384                                 "failed to allocate dma channel %i\n", dma0);
1385                         return -EINVAL;
1386                 }
1387                 devpriv->dma0 = dma0;
1388                 devpriv->dma_current = dma0;
1389                 if (dma1) {
1390                         if (request_dma(dma1, dev->driver->driver_name)) {
1391                                 dev_err(dev->class_dev,
1392                                         "failed to allocate dma channel %i\n",
1393                                         dma1);
1394                                 return -EINVAL;
1395                         }
1396                         devpriv->dma1 = dma1;
1397                 }
1398                 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1399                 if (devpriv->ai_buf0 == NULL)
1400                         return -ENOMEM;
1401                 devpriv->dma_current_buf = devpriv->ai_buf0;
1402                 if (dma1) {
1403                         devpriv->ai_buf1 =
1404                             kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1405                         if (devpriv->ai_buf1 == NULL)
1406                                 return -ENOMEM;
1407                 }
1408                 flags = claim_dma_lock();
1409                 disable_dma(devpriv->dma0);
1410                 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
1411                 if (dma1) {
1412                         disable_dma(devpriv->dma1);
1413                         set_dma_mode(devpriv->dma1, DMA_MODE_READ);
1414                 }
1415                 release_dma_lock(flags);
1416         }
1417         return 0;
1418 }
1419
1420 static int das1800_probe(struct comedi_device *dev)
1421 {
1422         int id;
1423         int board;
1424
1425         id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf;   /* get id bits */
1426         board = ((struct das1800_board *)dev->board_ptr) - das1800_boards;
1427
1428         switch (id) {
1429         case 0x3:
1430                 if (board == das1801st_da || board == das1802st_da ||
1431                     board == das1701st_da || board == das1702st_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-1800st-da series\n");
1438                 return das1801st;
1439                 break;
1440         case 0x4:
1441                 if (board == das1802hr_da || board == das1702hr_da) {
1442                         dev_dbg(dev->class_dev, "Board model: %s\n",
1443                                 das1800_boards[board].name);
1444                         return board;
1445                 }
1446                 printk
1447                     (" Board model (probed, not recommended): das-1802hr-da\n");
1448                 return das1802hr;
1449                 break;
1450         case 0x5:
1451                 if (board == das1801ao || board == das1802ao ||
1452                     board == das1701ao || board == das1702ao) {
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-1800ao series\n");
1459                 return das1801ao;
1460                 break;
1461         case 0x6:
1462                 if (board == das1802hr || board == das1702hr) {
1463                         dev_dbg(dev->class_dev, "Board model: %s\n",
1464                                 das1800_boards[board].name);
1465                         return board;
1466                 }
1467                 printk
1468                     (" Board model (probed, not recommended): das-1802hr\n");
1469                 return das1802hr;
1470                 break;
1471         case 0x7:
1472                 if (board == das1801st || board == das1802st ||
1473                     board == das1701st || board == das1702st) {
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-1800st series\n");
1480                 return das1801st;
1481                 break;
1482         case 0x8:
1483                 if (board == das1801hc || board == das1802hc) {
1484                         dev_dbg(dev->class_dev, "Board model: %s\n",
1485                                 das1800_boards[board].name);
1486                         return board;
1487                 }
1488                 printk
1489                     (" Board model (probed, not recommended): das-1800hc series\n");
1490                 return das1801hc;
1491                 break;
1492         default:
1493                 printk
1494                     (" Board model: probe returned 0x%x (unknown, please report)\n",
1495                      id);
1496                 return board;
1497                 break;
1498         }
1499         return -1;
1500 }
1501
1502 static int das1800_attach(struct comedi_device *dev,
1503                           struct comedi_devconfig *it)
1504 {
1505         const struct das1800_board *thisboard = comedi_board(dev);
1506         struct das1800_private *devpriv;
1507         struct comedi_subdevice *s;
1508         unsigned int irq = it->options[1];
1509         unsigned int dma0 = it->options[2];
1510         unsigned int dma1 = it->options[3];
1511         int board;
1512         int ret;
1513
1514         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
1515         if (!devpriv)
1516                 return -ENOMEM;
1517
1518         ret = comedi_request_region(dev, it->options[0], DAS1800_SIZE);
1519         if (ret)
1520                 return ret;
1521
1522         board = das1800_probe(dev);
1523         if (board < 0) {
1524                 dev_err(dev->class_dev, "unable to determine board type\n");
1525                 return -ENODEV;
1526         }
1527
1528         dev->board_ptr = das1800_boards + board;
1529         thisboard = comedi_board(dev);
1530         dev->board_name = thisboard->name;
1531
1532         /*  if it is an 'ao' board with fancy analog out then we need extra io ports */
1533         if (thisboard->ao_ability == 2) {
1534                 unsigned long iobase2 = dev->iobase + IOBASE2;
1535
1536                 ret = __comedi_request_region(dev, iobase2, DAS1800_SIZE);
1537                 if (ret)
1538                         return ret;
1539                 devpriv->iobase2 = iobase2;
1540         }
1541
1542         /* grab our IRQ */
1543         if (irq) {
1544                 if (request_irq(irq, das1800_interrupt, 0,
1545                                 dev->driver->driver_name, dev)) {
1546                         dev_dbg(dev->class_dev, "unable to allocate irq %u\n",
1547                                 irq);
1548                         return -EINVAL;
1549                 }
1550         }
1551         dev->irq = irq;
1552
1553         /*  set bits that tell card which irq to use */
1554         switch (irq) {
1555         case 0:
1556                 break;
1557         case 3:
1558                 devpriv->irq_dma_bits |= 0x8;
1559                 break;
1560         case 5:
1561                 devpriv->irq_dma_bits |= 0x10;
1562                 break;
1563         case 7:
1564                 devpriv->irq_dma_bits |= 0x18;
1565                 break;
1566         case 10:
1567                 devpriv->irq_dma_bits |= 0x28;
1568                 break;
1569         case 11:
1570                 devpriv->irq_dma_bits |= 0x30;
1571                 break;
1572         case 15:
1573                 devpriv->irq_dma_bits |= 0x38;
1574                 break;
1575         default:
1576                 dev_err(dev->class_dev, "irq out of range\n");
1577                 return -EINVAL;
1578                 break;
1579         }
1580
1581         ret = das1800_init_dma(dev, dma0, dma1);
1582         if (ret < 0)
1583                 return ret;
1584
1585         if (devpriv->ai_buf0 == NULL) {
1586                 devpriv->ai_buf0 =
1587                     kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
1588                 if (devpriv->ai_buf0 == NULL)
1589                         return -ENOMEM;
1590         }
1591
1592         ret = comedi_alloc_subdevices(dev, 4);
1593         if (ret)
1594                 return ret;
1595
1596         /* analog input subdevice */
1597         s = &dev->subdevices[0];
1598         dev->read_subdev = s;
1599         s->type = COMEDI_SUBD_AI;
1600         s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
1601         if (thisboard->common)
1602                 s->subdev_flags |= SDF_COMMON;
1603         s->n_chan = thisboard->qram_len;
1604         s->len_chanlist = thisboard->qram_len;
1605         s->maxdata = (1 << thisboard->resolution) - 1;
1606         s->range_table = thisboard->range_ai;
1607         s->do_cmd = das1800_ai_do_cmd;
1608         s->do_cmdtest = das1800_ai_do_cmdtest;
1609         s->insn_read = das1800_ai_rinsn;
1610         s->poll = das1800_ai_poll;
1611         s->cancel = das1800_cancel;
1612
1613         /* analog out */
1614         s = &dev->subdevices[1];
1615         if (thisboard->ao_ability == 1) {
1616                 s->type = COMEDI_SUBD_AO;
1617                 s->subdev_flags = SDF_WRITABLE;
1618                 s->n_chan = thisboard->ao_n_chan;
1619                 s->maxdata = (1 << thisboard->resolution) - 1;
1620                 s->range_table = &range_bipolar10;
1621                 s->insn_write = das1800_ao_winsn;
1622         } else {
1623                 s->type = COMEDI_SUBD_UNUSED;
1624         }
1625
1626         /* di */
1627         s = &dev->subdevices[2];
1628         s->type = COMEDI_SUBD_DI;
1629         s->subdev_flags = SDF_READABLE;
1630         s->n_chan = 4;
1631         s->maxdata = 1;
1632         s->range_table = &range_digital;
1633         s->insn_bits = das1800_di_rbits;
1634
1635         /* do */
1636         s = &dev->subdevices[3];
1637         s->type = COMEDI_SUBD_DO;
1638         s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
1639         s->n_chan = thisboard->do_n_chan;
1640         s->maxdata = 1;
1641         s->range_table = &range_digital;
1642         s->insn_bits = das1800_do_wbits;
1643
1644         das1800_cancel(dev, dev->read_subdev);
1645
1646         /*  initialize digital out channels */
1647         outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1648
1649         /*  initialize analog out channels */
1650         if (thisboard->ao_ability == 1) {
1651                 /*  select 'update' dac channel for baseAddress + 0x0 */
1652                 outb(DAC(thisboard->ao_n_chan - 1),
1653                      dev->iobase + DAS1800_SELECT);
1654                 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1655         }
1656
1657         return 0;
1658 };
1659
1660 static void das1800_detach(struct comedi_device *dev)
1661 {
1662         struct das1800_private *devpriv = dev->private;
1663
1664         if (devpriv) {
1665                 if (devpriv->dma0)
1666                         free_dma(devpriv->dma0);
1667                 if (devpriv->dma1)
1668                         free_dma(devpriv->dma1);
1669                 kfree(devpriv->ai_buf0);
1670                 kfree(devpriv->ai_buf1);
1671                 if (devpriv->iobase2)
1672                         release_region(devpriv->iobase2, DAS1800_SIZE);
1673         }
1674         comedi_legacy_detach(dev);
1675 }
1676
1677 static struct comedi_driver das1800_driver = {
1678         .driver_name    = "das1800",
1679         .module         = THIS_MODULE,
1680         .attach         = das1800_attach,
1681         .detach         = das1800_detach,
1682         .num_names      = ARRAY_SIZE(das1800_boards),
1683         .board_name     = &das1800_boards[0].name,
1684         .offset         = sizeof(struct das1800_board),
1685 };
1686 module_comedi_driver(das1800_driver);
1687
1688 MODULE_AUTHOR("Comedi http://www.comedi.org");
1689 MODULE_DESCRIPTION("Comedi low-level driver");
1690 MODULE_LICENSE("GPL");