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     You should have received a copy of the GNU General Public License
  20     along with this program; if not, write to the Free Software
  21     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22
  23 ************************************************************************
  24 */
  25 /*
  26 Driver: das1800
  27 Description: Keithley Metrabyte DAS1800 (& compatibles)
  28 Author: Frank Mori Hess <fmhess@users.sourceforge.net>
  29 Devices: [Keithley Metrabyte] DAS-1701ST (das-1701st),
  30   DAS-1701ST-DA (das-1701st-da), DAS-1701/AO (das-1701ao),
  31   DAS-1702ST (das-1702st), DAS-1702ST-DA (das-1702st-da),
  32   DAS-1702HR (das-1702hr), DAS-1702HR-DA (das-1702hr-da),
  33   DAS-1702/AO (das-1702ao), DAS-1801ST (das-1801st),
  34   DAS-1801ST-DA (das-1801st-da), DAS-1801HC (das-1801hc),
  35   DAS-1801AO (das-1801ao), DAS-1802ST (das-1802st),
  36   DAS-1802ST-DA (das-1802st-da), DAS-1802HR (das-1802hr),
  37   DAS-1802HR-DA (das-1802hr-da), DAS-1802HC (das-1802hc),
  38   DAS-1802AO (das-1802ao)
  39 Status: works
  40
  41 The waveform analog output on the 'ao' cards is not supported.
  42 If you need it, send me (Frank Hess) an email.
  43
  44 Configuration options:
  45   [0] - I/O port base address
  46   [1] - IRQ (optional, required for timed or externally triggered conversions)
  47   [2] - DMA0 (optional, requires irq)
  48   [3] - DMA1 (optional, requires irq and dma0)
  49 */
  50 /*
  51
  52 This driver supports the following Keithley boards:
  53
  54 das-1701st
  55 das-1701st-da
  56 das-1701ao
  57 das-1702st
  58 das-1702st-da
  59 das-1702hr
  60 das-1702hr-da
  61 das-1702ao
  62 das-1801st
  63 das-1801st-da
  64 das-1801hc
  65 das-1801ao
  66 das-1802st
  67 das-1802st-da
  68 das-1802hr
  69 das-1802hr-da
  70 das-1802hc
  71 das-1802ao
  72
  73 Options:
  74         [0] - base io address
  75         [1] - irq (optional, required for timed or externally triggered conversions)
  76         [2] - dma0 (optional, requires irq)
  77         [3] - dma1 (optional, requires irq and dma0)
  78
  79 irq can be omitted, although the cmd interface will not work without it.
  80
  81 analog input cmd triggers supported:
  82         start_src:      TRIG_NOW | TRIG_EXT
  83         scan_begin_src: TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT
  84         scan_end_src:   TRIG_COUNT
  85         convert_src:    TRIG_TIMER | TRIG_EXT (TRIG_EXT requires scan_begin_src == TRIG_FOLLOW)
  86         stop_src:       TRIG_COUNT | TRIG_EXT | TRIG_NONE
  87
  88 scan_begin_src triggers TRIG_TIMER and TRIG_EXT use the card's
  89 'burst mode' which limits the valid conversion time to 64 microseconds
  90 (convert_arg <= 64000).  This limitation does not apply if scan_begin_src
  91 is TRIG_FOLLOW.
  92
  93 NOTES:
  94 Only the DAS-1801ST has been tested by me.
  95 Unipolar and bipolar ranges cannot be mixed in the channel/gain list.
  96
  97 TODO:
  98         Make it automatically allocate irq and dma channels if they are not specified
  99         Add support for analog out on 'ao' cards
 100         read insn for analog out
 101 */
 102
 103 #include <linux/interrupt.h>
 104 #include <linux/slab.h>
 105 #include <linux/io.h>
 106 #include "../comedidev.h"
 107
 108 #include <linux/ioport.h>
 109 #include <asm/dma.h>
 110
 111 #include "8253.h"
 112 #include "comedi_fc.h"
 113
 114 /* misc. defines */
 115 #define DAS1800_SIZE           16       /* uses 16 io addresses */
 116 #define FIFO_SIZE              1024     /*  1024 sample fifo */
 117 #define TIMER_BASE             200      /*  5 Mhz master clock */
 118 #define UNIPOLAR               0x4      /*  bit that determines whether input range is uni/bipolar */
 119 #define DMA_BUF_SIZE           0x1ff00  /*  size in bytes of dma buffers */
 120
 121 /* Registers for the das1800 */
 122 #define DAS1800_FIFO            0x0
 123 #define DAS1800_QRAM            0x0
 124 #define DAS1800_DAC             0x0
 125 #define DAS1800_SELECT          0x2
 126 #define   ADC                     0x0
 127 #define   QRAM                    0x1
 128 #define   DAC(a)                  (0x2 + a)
 129 #define DAS1800_DIGITAL         0x3
 130 #define DAS1800_CONTROL_A       0x4
 131 #define   FFEN                    0x1
 132 #define   CGEN                    0x4
 133 #define   CGSL                    0x8
 134 #define   TGEN                    0x10
 135 #define   TGSL                    0x20
 136 #define   ATEN                    0x80
 137 #define DAS1800_CONTROL_B       0x5
 138 #define   DMA_CH5                 0x1
 139 #define   DMA_CH6                 0x2
 140 #define   DMA_CH7                 0x3
 141 #define   DMA_CH5_CH6             0x5
 142 #define   DMA_CH6_CH7             0x6
 143 #define   DMA_CH7_CH5             0x7
 144 #define   DMA_ENABLED             0x3   /* mask used to determine if dma is enabled */
 145 #define   DMA_DUAL                0x4
 146 #define   IRQ3                    0x8
 147 #define   IRQ5                    0x10
 148 #define   IRQ7                    0x18
 149 #define   IRQ10                   0x28
 150 #define   IRQ11                   0x30
 151 #define   IRQ15                   0x38
 152 #define   FIMD                    0x40
 153 #define DAS1800_CONTROL_C       0X6
 154 #define   IPCLK                   0x1
 155 #define   XPCLK                   0x3
 156 #define   BMDE                    0x4
 157 #define   CMEN                    0x8
 158 #define   UQEN                    0x10
 159 #define   SD                      0x40
 160 #define   UB                      0x80
 161 #define DAS1800_STATUS          0x7
 162 /* bits that prevent interrupt status bits (and CVEN) from being cleared on write */
 163 #define   CLEAR_INTR_MASK         (CVEN_MASK | 0x1f)
 164 #define   INT                     0x1
 165 #define   DMATC                   0x2
 166 #define   CT0TC                   0x8
 167 #define   OVF                     0x10
 168 #define   FHF                     0x20
 169 #define   FNE                     0x40
 170 #define   CVEN_MASK               0x40  /*  masks CVEN on write */
 171 #define   CVEN                    0x80
 172 #define DAS1800_BURST_LENGTH    0x8
 173 #define DAS1800_BURST_RATE      0x9
 174 #define DAS1800_QRAM_ADDRESS    0xa
 175 #define DAS1800_COUNTER         0xc
 176
 177 #define IOBASE2                   0x400 /* offset of additional ioports used on 'ao' cards */
 178
 179 enum {
 180         das1701st, das1701st_da, das1702st, das1702st_da, das1702hr,
 181         das1702hr_da,
 182         das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da,
 183         das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao
 184 };
 185
 186 /* analog input ranges */
 187 static const struct comedi_lrange range_ai_das1801 = {
 188         8,
 189         {
 190          RANGE(-5, 5),
 191          RANGE(-1, 1),
 192          RANGE(-0.1, 0.1),
 193          RANGE(-0.02, 0.02),
 194          RANGE(0, 5),
 195          RANGE(0, 1),
 196          RANGE(0, 0.1),
 197          RANGE(0, 0.02),
 198          }
 199 };
 200
 201 static const struct comedi_lrange range_ai_das1802 = {
 202         8,
 203         {
 204          RANGE(-10, 10),
 205          RANGE(-5, 5),
 206          RANGE(-2.5, 2.5),
 207          RANGE(-1.25, 1.25),
 208          RANGE(0, 10),
 209          RANGE(0, 5),
 210          RANGE(0, 2.5),
 211          RANGE(0, 1.25),
 212          }
 213 };
 214
 215 struct das1800_board {
 216         const char *name;
 217         int ai_speed;           /* max conversion period in nanoseconds */
 218         int resolution;         /* bits of ai resolution */
 219         int qram_len;           /* length of card's channel / gain queue */
 220         int common;             /* supports AREF_COMMON flag */
 221         int do_n_chan;          /* number of digital output channels */
 222         int ao_ability;         /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */
 223         int ao_n_chan;          /* number of analog out channels */
 224         const struct comedi_lrange *range_ai;   /* available input ranges */
 225 };
 226
 227 /* Warning: the maximum conversion speeds listed below are
 228  * not always achievable depending on board setup (see
 229  * user manual.)
 230  */
 231 static const struct das1800_board das1800_boards[] = {
 232         {
 233          .name = "das-1701st",
 234          .ai_speed = 6250,
 235          .resolution = 12,
 236          .qram_len = 256,
 237          .common = 1,
 238          .do_n_chan = 4,
 239          .ao_ability = 0,
 240          .ao_n_chan = 0,
 241          .range_ai = &range_ai_das1801,
 242          },
 243         {
 244          .name = "das-1701st-da",
 245          .ai_speed = 6250,
 246          .resolution = 12,
 247          .qram_len = 256,
 248          .common = 1,
 249          .do_n_chan = 4,
 250          .ao_ability = 1,
 251          .ao_n_chan = 4,
 252          .range_ai = &range_ai_das1801,
 253          },
 254         {
 255          .name = "das-1702st",
 256          .ai_speed = 6250,
 257          .resolution = 12,
 258          .qram_len = 256,
 259          .common = 1,
 260          .do_n_chan = 4,
 261          .ao_ability = 0,
 262          .ao_n_chan = 0,
 263          .range_ai = &range_ai_das1802,
 264          },
 265         {
 266          .name = "das-1702st-da",
 267          .ai_speed = 6250,
 268          .resolution = 12,
 269          .qram_len = 256,
 270          .common = 1,
 271          .do_n_chan = 4,
 272          .ao_ability = 1,
 273          .ao_n_chan = 4,
 274          .range_ai = &range_ai_das1802,
 275          },
 276         {
 277          .name = "das-1702hr",
 278          .ai_speed = 20000,
 279          .resolution = 16,
 280          .qram_len = 256,
 281          .common = 1,
 282          .do_n_chan = 4,
 283          .ao_ability = 0,
 284          .ao_n_chan = 0,
 285          .range_ai = &range_ai_das1802,
 286          },
 287         {
 288          .name = "das-1702hr-da",
 289          .ai_speed = 20000,
 290          .resolution = 16,
 291          .qram_len = 256,
 292          .common = 1,
 293          .do_n_chan = 4,
 294          .ao_ability = 1,
 295          .ao_n_chan = 2,
 296          .range_ai = &range_ai_das1802,
 297          },
 298         {
 299          .name = "das-1701ao",
 300          .ai_speed = 6250,
 301          .resolution = 12,
 302          .qram_len = 256,
 303          .common = 1,
 304          .do_n_chan = 4,
 305          .ao_ability = 2,
 306          .ao_n_chan = 2,
 307          .range_ai = &range_ai_das1801,
 308          },
 309         {
 310          .name = "das-1702ao",
 311          .ai_speed = 6250,
 312          .resolution = 12,
 313          .qram_len = 256,
 314          .common = 1,
 315          .do_n_chan = 4,
 316          .ao_ability = 2,
 317          .ao_n_chan = 2,
 318          .range_ai = &range_ai_das1802,
 319          },
 320         {
 321          .name = "das-1801st",
 322          .ai_speed = 3000,
 323          .resolution = 12,
 324          .qram_len = 256,
 325          .common = 1,
 326          .do_n_chan = 4,
 327          .ao_ability = 0,
 328          .ao_n_chan = 0,
 329          .range_ai = &range_ai_das1801,
 330          },
 331         {
 332          .name = "das-1801st-da",
 333          .ai_speed = 3000,
 334          .resolution = 12,
 335          .qram_len = 256,
 336          .common = 1,
 337          .do_n_chan = 4,
 338          .ao_ability = 0,
 339          .ao_n_chan = 4,
 340          .range_ai = &range_ai_das1801,
 341          },
 342         {
 343          .name = "das-1802st",
 344          .ai_speed = 3000,
 345          .resolution = 12,
 346          .qram_len = 256,
 347          .common = 1,
 348          .do_n_chan = 4,
 349          .ao_ability = 0,
 350          .ao_n_chan = 0,
 351          .range_ai = &range_ai_das1802,
 352          },
 353         {
 354          .name = "das-1802st-da",
 355          .ai_speed = 3000,
 356          .resolution = 12,
 357          .qram_len = 256,
 358          .common = 1,
 359          .do_n_chan = 4,
 360          .ao_ability = 1,
 361          .ao_n_chan = 4,
 362          .range_ai = &range_ai_das1802,
 363          },
 364         {
 365          .name = "das-1802hr",
 366          .ai_speed = 10000,
 367          .resolution = 16,
 368          .qram_len = 256,
 369          .common = 1,
 370          .do_n_chan = 4,
 371          .ao_ability = 0,
 372          .ao_n_chan = 0,
 373          .range_ai = &range_ai_das1802,
 374          },
 375         {
 376          .name = "das-1802hr-da",
 377          .ai_speed = 10000,
 378          .resolution = 16,
 379          .qram_len = 256,
 380          .common = 1,
 381          .do_n_chan = 4,
 382          .ao_ability = 1,
 383          .ao_n_chan = 2,
 384          .range_ai = &range_ai_das1802,
 385          },
 386         {
 387          .name = "das-1801hc",
 388          .ai_speed = 3000,
 389          .resolution = 12,
 390          .qram_len = 64,
 391          .common = 0,
 392          .do_n_chan = 8,
 393          .ao_ability = 1,
 394          .ao_n_chan = 2,
 395          .range_ai = &range_ai_das1801,
 396          },
 397         {
 398          .name = "das-1802hc",
 399          .ai_speed = 3000,
 400          .resolution = 12,
 401          .qram_len = 64,
 402          .common = 0,
 403          .do_n_chan = 8,
 404          .ao_ability = 1,
 405          .ao_n_chan = 2,
 406          .range_ai = &range_ai_das1802,
 407          },
 408         {
 409          .name = "das-1801ao",
 410          .ai_speed = 3000,
 411          .resolution = 12,
 412          .qram_len = 256,
 413          .common = 1,
 414          .do_n_chan = 4,
 415          .ao_ability = 2,
 416          .ao_n_chan = 2,
 417          .range_ai = &range_ai_das1801,
 418          },
 419         {
 420          .name = "das-1802ao",
 421          .ai_speed = 3000,
 422          .resolution = 12,
 423          .qram_len = 256,
 424          .common = 1,
 425          .do_n_chan = 4,
 426          .ao_ability = 2,
 427          .ao_n_chan = 2,
 428          .range_ai = &range_ai_das1802,
 429          },
 430 };
 431
 432 struct das1800_private {
 433         volatile unsigned int count;    /* number of data points left to be taken */
 434         unsigned int divisor1;  /* value to load into board's counter 1 for timed conversions */
 435         unsigned int divisor2;  /* value to load into board's counter 2 for timed conversions */
 436         int do_bits;            /* digital output bits */
 437         int irq_dma_bits;       /* bits for control register b */
 438         /* dma bits for control register b, stored so that dma can be
 439          * turned on and off */
 440         int dma_bits;
 441         unsigned int dma0;      /* dma channels used */
 442         unsigned int dma1;
 443         volatile unsigned int dma_current;      /* dma channel currently in use */
 444         uint16_t *ai_buf0;      /* pointers to dma buffers */
 445         uint16_t *ai_buf1;
 446         uint16_t *dma_current_buf;      /* pointer to dma buffer currently being used */
 447         unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
 448         unsigned long iobase2;  /* secondary io address used for analog out on 'ao' boards */
 449         short ao_update_bits;   /* remembers the last write to the 'update' dac */
 450 };
 451
 452 /* analog out range for 'ao' boards */
 453 /*
 454 static const struct comedi_lrange range_ao_2 = {
 455         2,
 456         {
 457                 RANGE(-10, 10),
 458                 RANGE(-5, 5),
 459         }
 460 };
 461 */
 462
 463 static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
 464                                             uint16_t sample)
 465 {
 466         const struct das1800_board *thisboard = comedi_board(dev);
 467
 468         sample += 1 << (thisboard->resolution - 1);
 469         return sample;
 470 }
 471
 472 static void munge_data(struct comedi_device *dev, uint16_t * array,
 473                        unsigned int num_elements)
 474 {
 475         unsigned int i;
 476         int unipolar;
 477
 478         /* see if card is using a unipolar or bipolar range so we can munge data correctly */
 479         unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
 480
 481         /* convert to unsigned type if we are in a bipolar mode */
 482         if (!unipolar) {
 483                 for (i = 0; i < num_elements; i++)
 484                         array[i] = munge_bipolar_sample(dev, array[i]);
 485         }
 486 }
 487
 488 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
 489                                           struct comedi_subdevice *s)
 490 {
 491         struct das1800_private *devpriv = dev->private;
 492         int numPoints = 0;      /* number of points to read */
 493         struct comedi_cmd *cmd = &s->async->cmd;
 494
 495         numPoints = FIFO_SIZE / 2;
 496         /* if we only need some of the points */
 497         if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
 498                 numPoints = devpriv->count;
 499         insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
 500         munge_data(dev, devpriv->ai_buf0, numPoints);
 501         cfc_write_array_to_buffer(s, devpriv->ai_buf0,
 502                                   numPoints * sizeof(devpriv->ai_buf0[0]));
 503         if (cmd->stop_src == TRIG_COUNT)
 504                 devpriv->count -= numPoints;
 505         return;
 506 }
 507
 508 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
 509                                           struct comedi_subdevice *s)
 510 {
 511         struct das1800_private *devpriv = dev->private;
 512         short dpnt;
 513         int unipolar;
 514         struct comedi_cmd *cmd = &s->async->cmd;
 515
 516         unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
 517
 518         while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
 519                 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
 520                         break;
 521                 dpnt = inw(dev->iobase + DAS1800_FIFO);
 522                 /* convert to unsigned type if we are in a bipolar mode */
 523                 if (!unipolar)
 524                         ;
 525                 dpnt = munge_bipolar_sample(dev, dpnt);
 526                 cfc_write_to_buffer(s, dpnt);
 527                 if (cmd->stop_src == TRIG_COUNT)
 528                         devpriv->count--;
 529         }
 530
 531         return;
 532 }
 533
 534 /* Utility function used by das1800_flush_dma() and das1800_handle_dma().
 535  * Assumes dma lock is held */
 536 static void das1800_flush_dma_channel(struct comedi_device *dev,
 537                                       struct comedi_subdevice *s,
 538                                       unsigned int channel, uint16_t *buffer)
 539 {
 540         struct das1800_private *devpriv = dev->private;
 541         unsigned int num_bytes, num_samples;
 542         struct comedi_cmd *cmd = &s->async->cmd;
 543
 544         disable_dma(channel);
 545
 546         /* clear flip-flop to make sure 2-byte registers
 547          * get set correctly */
 548         clear_dma_ff(channel);
 549
 550         /*  figure out how many points to read */
 551         num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
 552         num_samples = num_bytes / sizeof(short);
 553
 554         /* if we only need some of the points */
 555         if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
 556                 num_samples = devpriv->count;
 557
 558         munge_data(dev, buffer, num_samples);
 559         cfc_write_array_to_buffer(s, buffer, num_bytes);
 560         if (s->async->cmd.stop_src == TRIG_COUNT)
 561                 devpriv->count -= num_samples;
 562
 563         return;
 564 }
 565
 566 /* flushes remaining data from board when external trigger has stopped acquisition
 567  * and we are using dma transfers */
 568 static void das1800_flush_dma(struct comedi_device *dev,
 569                               struct comedi_subdevice *s)
 570 {
 571         struct das1800_private *devpriv = dev->private;
 572         unsigned long flags;
 573         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
 574
 575         flags = claim_dma_lock();
 576         das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 577                                   devpriv->dma_current_buf);
 578
 579         if (dual_dma) {
 580                 /*  switch to other channel and flush it */
 581                 if (devpriv->dma_current == devpriv->dma0) {
 582                         devpriv->dma_current = devpriv->dma1;
 583                         devpriv->dma_current_buf = devpriv->ai_buf1;
 584                 } else {
 585                         devpriv->dma_current = devpriv->dma0;
 586                         devpriv->dma_current_buf = devpriv->ai_buf0;
 587                 }
 588                 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 589                                           devpriv->dma_current_buf);
 590         }
 591
 592         release_dma_lock(flags);
 593
 594         /*  get any remaining samples in fifo */
 595         das1800_handle_fifo_not_empty(dev, s);
 596
 597         return;
 598 }
 599
 600 static void das1800_handle_dma(struct comedi_device *dev,
 601                                struct comedi_subdevice *s, unsigned int status)
 602 {
 603         struct das1800_private *devpriv = dev->private;
 604         unsigned long flags;
 605         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
 606
 607         flags = claim_dma_lock();
 608         das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 609                                   devpriv->dma_current_buf);
 610         /*  re-enable  dma channel */
 611         set_dma_addr(devpriv->dma_current,
 612                      virt_to_bus(devpriv->dma_current_buf));
 613         set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
 614         enable_dma(devpriv->dma_current);
 615         release_dma_lock(flags);
 616
 617         if (status & DMATC) {
 618                 /*  clear DMATC interrupt bit */
 619                 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
 620                 /*  switch dma channels for next time, if appropriate */
 621                 if (dual_dma) {
 622                         /*  read data from the other channel next time */
 623                         if (devpriv->dma_current == devpriv->dma0) {
 624                                 devpriv->dma_current = devpriv->dma1;
 625                                 devpriv->dma_current_buf = devpriv->ai_buf1;
 626                         } else {
 627                                 devpriv->dma_current = devpriv->dma0;
 628                                 devpriv->dma_current_buf = devpriv->ai_buf0;
 629                         }
 630                 }
 631         }
 632
 633         return;
 634 }
 635
 636 static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
 637 {
 638         struct das1800_private *devpriv = dev->private;
 639
 640         outb(0x0, dev->iobase + DAS1800_STATUS);        /* disable conversions */
 641         outb(0x0, dev->iobase + DAS1800_CONTROL_B);     /* disable interrupts and dma */
 642         outb(0x0, dev->iobase + DAS1800_CONTROL_A);     /* disable and clear fifo and stop triggering */
 643         if (devpriv->dma0)
 644                 disable_dma(devpriv->dma0);
 645         if (devpriv->dma1)
 646                 disable_dma(devpriv->dma1);
 647         return 0;
 648 }
 649
 650 /* the guts of the interrupt handler, that is shared with das1800_ai_poll */
 651 static void das1800_ai_handler(struct comedi_device *dev)
 652 {
 653         struct das1800_private *devpriv = dev->private;
 654         struct comedi_subdevice *s = &dev->subdevices[0];
 655         struct comedi_async *async = s->async;
 656         struct comedi_cmd *cmd = &async->cmd;
 657         unsigned int status = inb(dev->iobase + DAS1800_STATUS);
 658
 659         async->events = 0;
 660         /*  select adc for base address + 0 */
 661         outb(ADC, dev->iobase + DAS1800_SELECT);
 662         /*  dma buffer full */
 663         if (devpriv->irq_dma_bits & DMA_ENABLED) {
 664                 /*  look for data from dma transfer even if dma terminal count hasn't happened yet */
 665                 das1800_handle_dma(dev, s, status);
 666         } else if (status & FHF) {      /*  if fifo half full */
 667                 das1800_handle_fifo_half_full(dev, s);
 668         } else if (status & FNE) {      /*  if fifo not empty */
 669                 das1800_handle_fifo_not_empty(dev, s);
 670         }
 671
 672         async->events |= COMEDI_CB_BLOCK;
 673         /* if the card's fifo has overflowed */
 674         if (status & OVF) {
 675                 /*  clear OVF interrupt bit */
 676                 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
 677                 comedi_error(dev, "DAS1800 FIFO overflow");
 678                 das1800_cancel(dev, s);
 679                 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
 680                 comedi_event(dev, s);
 681                 return;
 682         }
 683         /*  stop taking data if appropriate */
 684         /* stop_src TRIG_EXT */
 685         if (status & CT0TC) {
 686                 /*  clear CT0TC interrupt bit */
 687                 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
 688                 /*  make sure we get all remaining data from board before quitting */
 689                 if (devpriv->irq_dma_bits & DMA_ENABLED)
 690                         das1800_flush_dma(dev, s);
 691                 else
 692                         das1800_handle_fifo_not_empty(dev, s);
 693                 das1800_cancel(dev, s); /* disable hardware conversions */
 694                 async->events |= COMEDI_CB_EOA;
 695         } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) {        /*  stop_src TRIG_COUNT */
 696                 das1800_cancel(dev, s); /* disable hardware conversions */
 697                 async->events |= COMEDI_CB_EOA;
 698         }
 699
 700         comedi_event(dev, s);
 701
 702         return;
 703 }
 704
 705 static int das1800_ai_poll(struct comedi_device *dev,
 706                            struct comedi_subdevice *s)
 707 {
 708         unsigned long flags;
 709
 710         /*  prevent race with interrupt handler */
 711         spin_lock_irqsave(&dev->spinlock, flags);
 712         das1800_ai_handler(dev);
 713         spin_unlock_irqrestore(&dev->spinlock, flags);
 714
 715         return s->async->buf_write_count - s->async->buf_read_count;
 716 }
 717
 718 static irqreturn_t das1800_interrupt(int irq, void *d)
 719 {
 720         struct comedi_device *dev = d;
 721         unsigned int status;
 722
 723         if (!dev->attached) {
 724                 comedi_error(dev, "premature interrupt");
 725                 return IRQ_HANDLED;
 726         }
 727
 728         /* Prevent race with das1800_ai_poll() on multi processor systems.
 729          * Also protects indirect addressing in das1800_ai_handler */
 730         spin_lock(&dev->spinlock);
 731         status = inb(dev->iobase + DAS1800_STATUS);
 732
 733         /* if interrupt was not caused by das-1800 */
 734         if (!(status & INT)) {
 735                 spin_unlock(&dev->spinlock);
 736                 return IRQ_NONE;
 737         }
 738         /* clear the interrupt status bit INT */
 739         outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
 740         /*  handle interrupt */
 741         das1800_ai_handler(dev);
 742
 743         spin_unlock(&dev->spinlock);
 744         return IRQ_HANDLED;
 745 }
 746
 747 /* converts requested conversion timing to timing compatible with
 748  * hardware, used only when card is in 'burst mode'
 749  */
 750 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
 751 {
 752         unsigned int micro_sec;
 753
 754         /*  in burst mode, the maximum conversion time is 64 microseconds */
 755         if (convert_arg > 64000)
 756                 convert_arg = 64000;
 757
 758         /*  the conversion time must be an integral number of microseconds */
 759         switch (round_mode) {
 760         case TRIG_ROUND_NEAREST:
 761         default:
 762                 micro_sec = (convert_arg + 500) / 1000;
 763                 break;
 764         case TRIG_ROUND_DOWN:
 765                 micro_sec = convert_arg / 1000;
 766                 break;
 767         case TRIG_ROUND_UP:
 768                 micro_sec = (convert_arg - 1) / 1000 + 1;
 769                 break;
 770         }
 771
 772         /*  return number of nanoseconds */
 773         return micro_sec * 1000;
 774 }
 775
 776 /* test analog input cmd */
 777 static int das1800_ai_do_cmdtest(struct comedi_device *dev,
 778                                  struct comedi_subdevice *s,
 779                                  struct comedi_cmd *cmd)
 780 {
 781         const struct das1800_board *thisboard = comedi_board(dev);
 782         struct das1800_private *devpriv = dev->private;
 783         int err = 0;
 784         unsigned int tmp_arg;
 785         int i;
 786         int unipolar;
 787
 788         /* Step 1 : check if triggers are trivially valid */
 789
 790         err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT);
 791         err |= cfc_check_trigger_src(&cmd->scan_begin_src,
 792                                         TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT);
 793         err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER | TRIG_EXT);
 794         err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
 795         err |= cfc_check_trigger_src(&cmd->stop_src,
 796                                         TRIG_COUNT | TRIG_EXT | TRIG_NONE);
 797
 798         if (err)
 799                 return 1;
 800
 801         /* Step 2a : make sure trigger sources are unique */
 802
 803         err |= cfc_check_trigger_is_unique(cmd->start_src);
 804         err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
 805         err |= cfc_check_trigger_is_unique(cmd->convert_src);
 806         err |= cfc_check_trigger_is_unique(cmd->stop_src);
 807
 808         /* Step 2b : and mutually compatible */
 809
 810         if (cmd->scan_begin_src != TRIG_FOLLOW &&
 811             cmd->convert_src != TRIG_TIMER)
 812                 err |= -EINVAL;
 813
 814         if (err)
 815                 return 2;
 816
 817         /* Step 3: check if arguments are trivially valid */
 818
 819         err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
 820
 821         if (cmd->convert_src == TRIG_TIMER)
 822                 err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
 823                                                  thisboard->ai_speed);
 824
 825         err |= cfc_check_trigger_arg_min(&cmd->chanlist_len, 1);
 826         err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
 827
 828         switch (cmd->stop_src) {
 829         case TRIG_COUNT:
 830                 err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
 831                 break;
 832         case TRIG_NONE:
 833                 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
 834                 break;
 835         default:
 836                 break;
 837         }
 838
 839         if (err)
 840                 return 3;
 841
 842         /* step 4: fix up any arguments */
 843
 844         if (cmd->convert_src == TRIG_TIMER) {
 845                 /*  if we are not in burst mode */
 846                 if (cmd->scan_begin_src == TRIG_FOLLOW) {
 847                         tmp_arg = cmd->convert_arg;
 848                         /* calculate counter values that give desired timing */
 849                         i8253_cascade_ns_to_timer_2div(TIMER_BASE,
 850                                                        &(devpriv->divisor1),
 851                                                        &(devpriv->divisor2),
 852                                                        &(cmd->convert_arg),
 853                                                        cmd->
 854                                                        flags & TRIG_ROUND_MASK);
 855                         if (tmp_arg != cmd->convert_arg)
 856                                 err++;
 857                 }
 858                 /*  if we are in burst mode */
 859                 else {
 860                         /*  check that convert_arg is compatible */
 861                         tmp_arg = cmd->convert_arg;
 862                         cmd->convert_arg =
 863                             burst_convert_arg(cmd->convert_arg,
 864                                               cmd->flags & TRIG_ROUND_MASK);
 865                         if (tmp_arg != cmd->convert_arg)
 866                                 err++;
 867
 868                         if (cmd->scan_begin_src == TRIG_TIMER) {
 869                                 /*  if scans are timed faster than conversion rate allows */
 870                                 if (cmd->convert_arg * cmd->chanlist_len >
 871                                     cmd->scan_begin_arg) {
 872                                         cmd->scan_begin_arg =
 873                                             cmd->convert_arg *
 874                                             cmd->chanlist_len;
 875                                         err++;
 876                                 }
 877                                 tmp_arg = cmd->scan_begin_arg;
 878                                 /* calculate counter values that give desired timing */
 879                                 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
 880                                                                &(devpriv->
 881                                                                  divisor1),
 882                                                                &(devpriv->
 883                                                                  divisor2),
 884                                                                &(cmd->
 885                                                                  scan_begin_arg),
 886                                                                cmd->
 887                                                                flags &
 888                                                                TRIG_ROUND_MASK);
 889                                 if (tmp_arg != cmd->scan_begin_arg)
 890                                         err++;
 891                         }
 892                 }
 893         }
 894
 895         if (err)
 896                 return 4;
 897
 898         /*  make sure user is not trying to mix unipolar and bipolar ranges */
 899         if (cmd->chanlist) {
 900                 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
 901                 for (i = 1; i < cmd->chanlist_len; i++) {
 902                         if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
 903                                 comedi_error(dev,
 904                                              "unipolar and bipolar ranges cannot be mixed in the chanlist");
 905                                 err++;
 906                                 break;
 907                         }
 908                 }
 909         }
 910
 911         if (err)
 912                 return 5;
 913
 914         return 0;
 915 }
 916
 917 /* returns appropriate bits for control register a, depending on command */
 918 static int control_a_bits(const struct comedi_cmd *cmd)
 919 {
 920         int control_a;
 921
 922         control_a = FFEN;       /* enable fifo */
 923         if (cmd->stop_src == TRIG_EXT)
 924                 control_a |= ATEN;
 925         switch (cmd->start_src) {
 926         case TRIG_EXT:
 927                 control_a |= TGEN | CGSL;
 928                 break;
 929         case TRIG_NOW:
 930                 control_a |= CGEN;
 931                 break;
 932         default:
 933                 break;
 934         }
 935
 936         return control_a;
 937 }
 938
 939 /* returns appropriate bits for control register c, depending on command */
 940 static int control_c_bits(const struct comedi_cmd *cmd)
 941 {
 942         int control_c;
 943         int aref;
 944
 945         /* set clock source to internal or external, select analog reference,
 946          * select unipolar / bipolar
 947          */
 948         aref = CR_AREF(cmd->chanlist[0]);
 949         control_c = UQEN;       /* enable upper qram addresses */
 950         if (aref != AREF_DIFF)
 951                 control_c |= SD;
 952         if (aref == AREF_COMMON)
 953                 control_c |= CMEN;
 954         /* if a unipolar range was selected */
 955         if (CR_RANGE(cmd->chanlist[0]) & UNIPOLAR)
 956                 control_c |= UB;
 957         switch (cmd->scan_begin_src) {
 958         case TRIG_FOLLOW:       /*  not in burst mode */
 959                 switch (cmd->convert_src) {
 960                 case TRIG_TIMER:
 961                         /* trig on cascaded counters */
 962                         control_c |= IPCLK;
 963                         break;
 964                 case TRIG_EXT:
 965                         /* trig on falling edge of external trigger */
 966                         control_c |= XPCLK;
 967                         break;
 968                 default:
 969                         break;
 970                 }
 971                 break;
 972         case TRIG_TIMER:
 973                 /*  burst mode with internal pacer clock */
 974                 control_c |= BMDE | IPCLK;
 975                 break;
 976         case TRIG_EXT:
 977                 /*  burst mode with external trigger */
 978                 control_c |= BMDE | XPCLK;
 979                 break;
 980         default:
 981                 break;
 982         }
 983
 984         return control_c;
 985 }
 986
 987 /* loads counters with divisor1, divisor2 from private structure */
 988 static int das1800_set_frequency(struct comedi_device *dev)
 989 {
 990         struct das1800_private *devpriv = dev->private;
 991         int err = 0;
 992
 993         /*  counter 1, mode 2 */
 994         if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
 995                        2))
 996                 err++;
 997         /*  counter 2, mode 2 */
 998         if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
 999                        2))
1000                 err++;
1001         if (err)
1002                 return -1;
1003
1004         return 0;
1005 }
1006
1007 /* sets up counters */
1008 static int setup_counters(struct comedi_device *dev,
1009                           const struct comedi_cmd *cmd)
1010 {
1011         struct das1800_private *devpriv = dev->private;
1012         unsigned int period;
1013
1014         /*  setup cascaded counters for conversion/scan frequency */
1015         switch (cmd->scan_begin_src) {
1016         case TRIG_FOLLOW:       /*  not in burst mode */
1017                 if (cmd->convert_src == TRIG_TIMER) {
1018                         /* set conversion frequency */
1019                         period = cmd->convert_arg;
1020                         i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1021                                                        &devpriv->divisor1,
1022                                                        &devpriv->divisor2,
1023                                                        &period,
1024                                                        cmd->flags &
1025                                                         TRIG_ROUND_MASK);
1026                         if (das1800_set_frequency(dev) < 0)
1027                                 return -1;
1028                 }
1029                 break;
1030         case TRIG_TIMER:        /*  in burst mode */
1031                 /* set scan frequency */
1032                 period = cmd->scan_begin_arg;
1033                 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &devpriv->divisor1,
1034                                                &devpriv->divisor2, &period,
1035                                                cmd->flags & TRIG_ROUND_MASK);
1036                 if (das1800_set_frequency(dev) < 0)
1037                         return -1;
1038                 break;
1039         default:
1040                 break;
1041         }
1042
1043         /*  setup counter 0 for 'about triggering' */
1044         if (cmd->stop_src == TRIG_EXT) {
1045                 /*  load counter 0 in mode 0 */
1046                 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1047         }
1048
1049         return 0;
1050 }
1051
1052 /* utility function that suggests a dma transfer size based on the conversion period 'ns' */
1053 static unsigned int suggest_transfer_size(const struct comedi_cmd *cmd)
1054 {
1055         unsigned int size = DMA_BUF_SIZE;
1056         static const int sample_size = 2;       /*  size in bytes of one sample from board */
1057         unsigned int fill_time = 300000000;     /*  target time in nanoseconds for filling dma buffer */
1058         unsigned int max_size;  /*  maximum size we will allow for a transfer */
1059
1060         /*  make dma buffer fill in 0.3 seconds for timed modes */
1061         switch (cmd->scan_begin_src) {
1062         case TRIG_FOLLOW:       /*  not in burst mode */
1063                 if (cmd->convert_src == TRIG_TIMER)
1064                         size = (fill_time / cmd->convert_arg) * sample_size;
1065                 break;
1066         case TRIG_TIMER:
1067                 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
1068                     sample_size;
1069                 break;
1070         default:
1071                 size = DMA_BUF_SIZE;
1072                 break;
1073         }
1074
1075         /*  set a minimum and maximum size allowed */
1076         max_size = DMA_BUF_SIZE;
1077         /*  if we are taking limited number of conversions, limit transfer size to that */
1078         if (cmd->stop_src == TRIG_COUNT &&
1079             cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
1080                 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1081
1082         if (size > max_size)
1083                 size = max_size;
1084         if (size < sample_size)
1085                 size = sample_size;
1086
1087         return size;
1088 }
1089
1090 /* sets up dma */
1091 static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd)
1092 {
1093         struct das1800_private *devpriv = dev->private;
1094         unsigned long lock_flags;
1095         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1096
1097         if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1098                 return;
1099
1100         /* determine a reasonable dma transfer size */
1101         devpriv->dma_transfer_size = suggest_transfer_size(cmd);
1102         lock_flags = claim_dma_lock();
1103         disable_dma(devpriv->dma0);
1104         /* clear flip-flop to make sure 2-byte registers for
1105          * count and address get set correctly */
1106         clear_dma_ff(devpriv->dma0);
1107         set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
1108         /*  set appropriate size of transfer */
1109         set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1110         devpriv->dma_current = devpriv->dma0;
1111         devpriv->dma_current_buf = devpriv->ai_buf0;
1112         enable_dma(devpriv->dma0);
1113         /*  set up dual dma if appropriate */
1114         if (dual_dma) {
1115                 disable_dma(devpriv->dma1);
1116                 /* clear flip-flop to make sure 2-byte registers for
1117                  * count and address get set correctly */
1118                 clear_dma_ff(devpriv->dma1);
1119                 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
1120                 /*  set appropriate size of transfer */
1121                 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1122                 enable_dma(devpriv->dma1);
1123         }
1124         release_dma_lock(lock_flags);
1125
1126         return;
1127 }
1128
1129 /* programs channel/gain list into card */
1130 static void program_chanlist(struct comedi_device *dev,
1131                              const struct comedi_cmd *cmd)
1132 {
1133         int i, n, chan_range;
1134         unsigned long irq_flags;
1135         const int range_mask = 0x3;     /* masks unipolar/bipolar bit off range */
1136         const int range_bitshift = 8;
1137
1138         n = cmd->chanlist_len;
1139         /*  spinlock protects indirect addressing */
1140         spin_lock_irqsave(&dev->spinlock, irq_flags);
1141         outb(QRAM, dev->iobase + DAS1800_SELECT);       /* select QRAM for baseAddress + 0x0 */
1142         outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);        /*set QRAM address start */
1143         /* make channel / gain list */
1144         for (i = 0; i < n; i++) {
1145                 chan_range =
1146                     CR_CHAN(cmd->chanlist[i]) |
1147                     ((CR_RANGE(cmd->chanlist[i]) & range_mask) <<
1148                      range_bitshift);
1149                 outw(chan_range, dev->iobase + DAS1800_QRAM);
1150         }
1151         outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);        /*finish write to QRAM */
1152         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1153
1154         return;
1155 }
1156
1157 /* analog input do_cmd */
1158 static int das1800_ai_do_cmd(struct comedi_device *dev,
1159                              struct comedi_subdevice *s)
1160 {
1161         struct das1800_private *devpriv = dev->private;
1162         int ret;
1163         int control_a, control_c;
1164         struct comedi_async *async = s->async;
1165         const struct comedi_cmd *cmd = &async->cmd;
1166
1167         if (!dev->irq) {
1168                 comedi_error(dev,
1169                              "no irq assigned for das-1800, cannot do hardware conversions");
1170                 return -1;
1171         }
1172
1173         /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1174          * (because dma in handler is unsafe at hard real-time priority) */
1175         if (cmd->flags & (TRIG_WAKE_EOS | TRIG_RT))
1176                 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1177         else
1178                 devpriv->irq_dma_bits |= devpriv->dma_bits;
1179         /*  interrupt on end of conversion for TRIG_WAKE_EOS */
1180         if (cmd->flags & TRIG_WAKE_EOS) {
1181                 /*  interrupt fifo not empty */
1182                 devpriv->irq_dma_bits &= ~FIMD;
1183         } else {
1184                 /*  interrupt fifo half full */
1185                 devpriv->irq_dma_bits |= FIMD;
1186         }
1187         /*  determine how many conversions we need */
1188         if (cmd->stop_src == TRIG_COUNT)
1189                 devpriv->count = cmd->stop_arg * cmd->chanlist_len;
1190
1191         das1800_cancel(dev, s);
1192
1193         /*  determine proper bits for control registers */
1194         control_a = control_a_bits(cmd);
1195         control_c = control_c_bits(cmd);
1196
1197         /* setup card and start */
1198         program_chanlist(dev, cmd);
1199         ret = setup_counters(dev, cmd);
1200         if (ret < 0) {
1201                 comedi_error(dev, "Error setting up counters");
1202                 return ret;
1203         }
1204         setup_dma(dev, cmd);
1205         outb(control_c, dev->iobase + DAS1800_CONTROL_C);
1206         /*  set conversion rate and length for burst mode */
1207         if (control_c & BMDE) {
1208                 /*  program conversion period with number of microseconds minus 1 */
1209                 outb(cmd->convert_arg / 1000 - 1,
1210                      dev->iobase + DAS1800_BURST_RATE);
1211                 outb(cmd->chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1212         }
1213         outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B);   /*  enable irq/dma */
1214         outb(control_a, dev->iobase + DAS1800_CONTROL_A);       /* enable fifo and triggering */
1215         outb(CVEN, dev->iobase + DAS1800_STATUS);       /* enable conversions */
1216
1217         return 0;
1218 }
1219
1220 /* read analog input */
1221 static int das1800_ai_rinsn(struct comedi_device *dev,
1222                             struct comedi_subdevice *s,
1223                             struct comedi_insn *insn, unsigned int *data)
1224 {
1225         const struct das1800_board *thisboard = comedi_board(dev);
1226         int i, n;
1227         int chan, range, aref, chan_range;
1228         int timeout = 1000;
1229         short dpnt;
1230         int conv_flags = 0;
1231         unsigned long irq_flags;
1232
1233         /* set up analog reference and unipolar / bipolar mode */
1234         aref = CR_AREF(insn->chanspec);
1235         conv_flags |= UQEN;
1236         if (aref != AREF_DIFF)
1237                 conv_flags |= SD;
1238         if (aref == AREF_COMMON)
1239                 conv_flags |= CMEN;
1240         /* if a unipolar range was selected */
1241         if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1242                 conv_flags |= UB;
1243
1244         outb(conv_flags, dev->iobase + DAS1800_CONTROL_C);      /* software conversion enabled */
1245         outb(CVEN, dev->iobase + DAS1800_STATUS);       /* enable conversions */
1246         outb(0x0, dev->iobase + DAS1800_CONTROL_A);     /* reset fifo */
1247         outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1248
1249         chan = CR_CHAN(insn->chanspec);
1250         /* mask of unipolar/bipolar bit from range */
1251         range = CR_RANGE(insn->chanspec) & 0x3;
1252         chan_range = chan | (range << 8);
1253         spin_lock_irqsave(&dev->spinlock, irq_flags);
1254         outb(QRAM, dev->iobase + DAS1800_SELECT);       /* select QRAM for baseAddress + 0x0 */
1255         outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);  /* set QRAM address start */
1256         outw(chan_range, dev->iobase + DAS1800_QRAM);
1257         outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);  /*finish write to QRAM */
1258         outb(ADC, dev->iobase + DAS1800_SELECT);        /* select ADC for baseAddress + 0x0 */
1259
1260         for (n = 0; n < insn->n; n++) {
1261                 /* trigger conversion */
1262                 outb(0, dev->iobase + DAS1800_FIFO);
1263                 for (i = 0; i < timeout; i++) {
1264                         if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1265                                 break;
1266                 }
1267                 if (i == timeout) {
1268                         comedi_error(dev, "timeout");
1269                         n = -ETIME;
1270                         goto exit;
1271                 }
1272                 dpnt = inw(dev->iobase + DAS1800_FIFO);
1273                 /* shift data to offset binary for bipolar ranges */
1274                 if ((conv_flags & UB) == 0)
1275                         dpnt += 1 << (thisboard->resolution - 1);
1276                 data[n] = dpnt;
1277         }
1278 exit:
1279         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1280
1281         return n;
1282 }
1283
1284 /* writes to an analog output channel */
1285 static int das1800_ao_winsn(struct comedi_device *dev,
1286                             struct comedi_subdevice *s,
1287                             struct comedi_insn *insn, unsigned int *data)
1288 {
1289         const struct das1800_board *thisboard = comedi_board(dev);
1290         struct das1800_private *devpriv = dev->private;
1291         int chan = CR_CHAN(insn->chanspec);
1292 /* int range = CR_RANGE(insn->chanspec); */
1293         int update_chan = thisboard->ao_n_chan - 1;
1294         short output;
1295         unsigned long irq_flags;
1296
1297         /*   card expects two's complement data */
1298         output = data[0] - (1 << (thisboard->resolution - 1));
1299         /*  if the write is to the 'update' channel, we need to remember its value */
1300         if (chan == update_chan)
1301                 devpriv->ao_update_bits = output;
1302         /*  write to channel */
1303         spin_lock_irqsave(&dev->spinlock, irq_flags);
1304         outb(DAC(chan), dev->iobase + DAS1800_SELECT);  /* select dac channel for baseAddress + 0x0 */
1305         outw(output, dev->iobase + DAS1800_DAC);
1306         /*  now we need to write to 'update' channel to update all dac channels */
1307         if (chan != update_chan) {
1308                 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT);   /* select 'update' channel for baseAddress + 0x0 */
1309                 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1310         }
1311         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1312
1313         return 1;
1314 }
1315
1316 /* reads from digital input channels */
1317 static int das1800_di_rbits(struct comedi_device *dev,
1318                             struct comedi_subdevice *s,
1319                             struct comedi_insn *insn, unsigned int *data)
1320 {
1321
1322         data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1323         data[0] = 0;
1324
1325         return insn->n;
1326 }
1327
1328 /* writes to digital output channels */
1329 static int das1800_do_wbits(struct comedi_device *dev,
1330                             struct comedi_subdevice *s,
1331                             struct comedi_insn *insn, unsigned int *data)
1332 {
1333         struct das1800_private *devpriv = dev->private;
1334         unsigned int wbits;
1335
1336         /*  only set bits that have been masked */
1337         data[0] &= (1 << s->n_chan) - 1;
1338         wbits = devpriv->do_bits;
1339         wbits &= ~data[0];
1340         wbits |= data[0] & data[1];
1341         devpriv->do_bits = wbits;
1342
1343         outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1344
1345         data[1] = devpriv->do_bits;
1346
1347         return insn->n;
1348 }
1349
1350 static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
1351                             unsigned int dma1)
1352 {
1353         struct das1800_private *devpriv = dev->private;
1354         unsigned long flags;
1355
1356         /*  need an irq to do dma */
1357         if (dev->irq && dma0) {
1358                 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
1359                 switch ((dma0 & 0x7) | (dma1 << 4)) {
1360                 case 0x5:       /*  dma0 == 5 */
1361                         devpriv->dma_bits |= DMA_CH5;
1362                         break;
1363                 case 0x6:       /*  dma0 == 6 */
1364                         devpriv->dma_bits |= DMA_CH6;
1365                         break;
1366                 case 0x7:       /*  dma0 == 7 */
1367                         devpriv->dma_bits |= DMA_CH7;
1368                         break;
1369                 case 0x65:      /*  dma0 == 5, dma1 == 6 */
1370                         devpriv->dma_bits |= DMA_CH5_CH6;
1371                         break;
1372                 case 0x76:      /*  dma0 == 6, dma1 == 7 */
1373                         devpriv->dma_bits |= DMA_CH6_CH7;
1374                         break;
1375                 case 0x57:      /*  dma0 == 7, dma1 == 5 */
1376                         devpriv->dma_bits |= DMA_CH7_CH5;
1377                         break;
1378                 default:
1379                         dev_err(dev->class_dev,
1380                                 "only supports dma channels 5 through 7\n");
1381                         dev_err(dev->class_dev,
1382                                 "Dual dma only allows the following combinations:\n");
1383                         dev_err(dev->class_dev,
1384                                 "dma 5,6 / 6,7 / or 7,5\n");
1385                         return -EINVAL;
1386                         break;
1387                 }
1388                 if (request_dma(dma0, dev->driver->driver_name)) {
1389                         dev_err(dev->class_dev,
1390                                 "failed to allocate dma channel %i\n", dma0);
1391                         return -EINVAL;
1392                 }
1393                 devpriv->dma0 = dma0;
1394                 devpriv->dma_current = dma0;
1395                 if (dma1) {
1396                         if (request_dma(dma1, dev->driver->driver_name)) {
1397                                 dev_err(dev->class_dev,
1398                                         "failed to allocate dma channel %i\n",
1399                                         dma1);
1400                                 return -EINVAL;
1401                         }
1402                         devpriv->dma1 = dma1;
1403                 }
1404                 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1405                 if (devpriv->ai_buf0 == NULL)
1406                         return -ENOMEM;
1407                 devpriv->dma_current_buf = devpriv->ai_buf0;
1408                 if (dma1) {
1409                         devpriv->ai_buf1 =
1410                             kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1411                         if (devpriv->ai_buf1 == NULL)
1412                                 return -ENOMEM;
1413                 }
1414                 flags = claim_dma_lock();
1415                 disable_dma(devpriv->dma0);
1416                 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
1417                 if (dma1) {
1418                         disable_dma(devpriv->dma1);
1419                         set_dma_mode(devpriv->dma1, DMA_MODE_READ);
1420                 }
1421                 release_dma_lock(flags);
1422         }
1423         return 0;
1424 }
1425
1426 static int das1800_probe(struct comedi_device *dev)
1427 {
1428         int id;
1429         int board;
1430
1431         id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf;   /* get id bits */
1432         board = ((struct das1800_board *)dev->board_ptr) - das1800_boards;
1433
1434         switch (id) {
1435         case 0x3:
1436                 if (board == das1801st_da || board == das1802st_da ||
1437                     board == das1701st_da || board == das1702st_da) {
1438                         dev_dbg(dev->class_dev, "Board model: %s\n",
1439                                 das1800_boards[board].name);
1440                         return board;
1441                 }
1442                 printk
1443                     (" Board model (probed, not recommended): das-1800st-da series\n");
1444                 return das1801st;
1445                 break;
1446         case 0x4:
1447                 if (board == das1802hr_da || board == das1702hr_da) {
1448                         dev_dbg(dev->class_dev, "Board model: %s\n",
1449                                 das1800_boards[board].name);
1450                         return board;
1451                 }
1452                 printk
1453                     (" Board model (probed, not recommended): das-1802hr-da\n");
1454                 return das1802hr;
1455                 break;
1456         case 0x5:
1457                 if (board == das1801ao || board == das1802ao ||
1458                     board == das1701ao || board == das1702ao) {
1459                         dev_dbg(dev->class_dev, "Board model: %s\n",
1460                                 das1800_boards[board].name);
1461                         return board;
1462                 }
1463                 printk
1464                     (" Board model (probed, not recommended): das-1800ao series\n");
1465                 return das1801ao;
1466                 break;
1467         case 0x6:
1468                 if (board == das1802hr || board == das1702hr) {
1469                         dev_dbg(dev->class_dev, "Board model: %s\n",
1470                                 das1800_boards[board].name);
1471                         return board;
1472                 }
1473                 printk
1474                     (" Board model (probed, not recommended): das-1802hr\n");
1475                 return das1802hr;
1476                 break;
1477         case 0x7:
1478                 if (board == das1801st || board == das1802st ||
1479                     board == das1701st || board == das1702st) {
1480                         dev_dbg(dev->class_dev, "Board model: %s\n",
1481                                 das1800_boards[board].name);
1482                         return board;
1483                 }
1484                 printk
1485                     (" Board model (probed, not recommended): das-1800st series\n");
1486                 return das1801st;
1487                 break;
1488         case 0x8:
1489                 if (board == das1801hc || board == das1802hc) {
1490                         dev_dbg(dev->class_dev, "Board model: %s\n",
1491                                 das1800_boards[board].name);
1492                         return board;
1493                 }
1494                 printk
1495                     (" Board model (probed, not recommended): das-1800hc series\n");
1496                 return das1801hc;
1497                 break;
1498         default:
1499                 printk
1500                     (" Board model: probe returned 0x%x (unknown, please report)\n",
1501                      id);
1502                 return board;
1503                 break;
1504         }
1505         return -1;
1506 }
1507
1508 static int das1800_attach(struct comedi_device *dev,
1509                           struct comedi_devconfig *it)
1510 {
1511         const struct das1800_board *thisboard = comedi_board(dev);
1512         struct das1800_private *devpriv;
1513         struct comedi_subdevice *s;
1514         unsigned int irq = it->options[1];
1515         unsigned int dma0 = it->options[2];
1516         unsigned int dma1 = it->options[3];
1517         int board;
1518         int ret;
1519
1520         devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
1521         if (!devpriv)
1522                 return -ENOMEM;
1523         dev->private = devpriv;
1524
1525         ret = comedi_request_region(dev, it->options[0], DAS1800_SIZE);
1526         if (ret)
1527                 return ret;
1528
1529         board = das1800_probe(dev);
1530         if (board < 0) {
1531                 dev_err(dev->class_dev, "unable to determine board type\n");
1532                 return -ENODEV;
1533         }
1534
1535         dev->board_ptr = das1800_boards + board;
1536         thisboard = comedi_board(dev);
1537         dev->board_name = thisboard->name;
1538
1539         /*  if it is an 'ao' board with fancy analog out then we need extra io ports */
1540         if (thisboard->ao_ability == 2) {
1541                 unsigned long iobase2 = dev->iobase + IOBASE2;
1542
1543                 ret = __comedi_request_region(dev, iobase2, DAS1800_SIZE);
1544                 if (ret)
1545                         return ret;
1546                 devpriv->iobase2 = iobase2;
1547         }
1548
1549         /* grab our IRQ */
1550         if (irq) {
1551                 if (request_irq(irq, das1800_interrupt, 0,
1552                                 dev->driver->driver_name, dev)) {
1553                         dev_dbg(dev->class_dev, "unable to allocate irq %u\n",
1554                                 irq);
1555                         return -EINVAL;
1556                 }
1557         }
1558         dev->irq = irq;
1559
1560         /*  set bits that tell card which irq to use */
1561         switch (irq) {
1562         case 0:
1563                 break;
1564         case 3:
1565                 devpriv->irq_dma_bits |= 0x8;
1566                 break;
1567         case 5:
1568                 devpriv->irq_dma_bits |= 0x10;
1569                 break;
1570         case 7:
1571                 devpriv->irq_dma_bits |= 0x18;
1572                 break;
1573         case 10:
1574                 devpriv->irq_dma_bits |= 0x28;
1575                 break;
1576         case 11:
1577                 devpriv->irq_dma_bits |= 0x30;
1578                 break;
1579         case 15:
1580                 devpriv->irq_dma_bits |= 0x38;
1581                 break;
1582         default:
1583                 dev_err(dev->class_dev, "irq out of range\n");
1584                 return -EINVAL;
1585                 break;
1586         }
1587
1588         ret = das1800_init_dma(dev, dma0, dma1);
1589         if (ret < 0)
1590                 return ret;
1591
1592         if (devpriv->ai_buf0 == NULL) {
1593                 devpriv->ai_buf0 =
1594                     kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
1595                 if (devpriv->ai_buf0 == NULL)
1596                         return -ENOMEM;
1597         }
1598
1599         ret = comedi_alloc_subdevices(dev, 4);
1600         if (ret)
1601                 return ret;
1602
1603         /* analog input subdevice */
1604         s = &dev->subdevices[0];
1605         dev->read_subdev = s;
1606         s->type = COMEDI_SUBD_AI;
1607         s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
1608         if (thisboard->common)
1609                 s->subdev_flags |= SDF_COMMON;
1610         s->n_chan = thisboard->qram_len;
1611         s->len_chanlist = thisboard->qram_len;
1612         s->maxdata = (1 << thisboard->resolution) - 1;
1613         s->range_table = thisboard->range_ai;
1614         s->do_cmd = das1800_ai_do_cmd;
1615         s->do_cmdtest = das1800_ai_do_cmdtest;
1616         s->insn_read = das1800_ai_rinsn;
1617         s->poll = das1800_ai_poll;
1618         s->cancel = das1800_cancel;
1619
1620         /* analog out */
1621         s = &dev->subdevices[1];
1622         if (thisboard->ao_ability == 1) {
1623                 s->type = COMEDI_SUBD_AO;
1624                 s->subdev_flags = SDF_WRITABLE;
1625                 s->n_chan = thisboard->ao_n_chan;
1626                 s->maxdata = (1 << thisboard->resolution) - 1;
1627                 s->range_table = &range_bipolar10;
1628                 s->insn_write = das1800_ao_winsn;
1629         } else {
1630                 s->type = COMEDI_SUBD_UNUSED;
1631         }
1632
1633         /* di */
1634         s = &dev->subdevices[2];
1635         s->type = COMEDI_SUBD_DI;
1636         s->subdev_flags = SDF_READABLE;
1637         s->n_chan = 4;
1638         s->maxdata = 1;
1639         s->range_table = &range_digital;
1640         s->insn_bits = das1800_di_rbits;
1641
1642         /* do */
1643         s = &dev->subdevices[3];
1644         s->type = COMEDI_SUBD_DO;
1645         s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
1646         s->n_chan = thisboard->do_n_chan;
1647         s->maxdata = 1;
1648         s->range_table = &range_digital;
1649         s->insn_bits = das1800_do_wbits;
1650
1651         das1800_cancel(dev, dev->read_subdev);
1652
1653         /*  initialize digital out channels */
1654         outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1655
1656         /*  initialize analog out channels */
1657         if (thisboard->ao_ability == 1) {
1658                 /*  select 'update' dac channel for baseAddress + 0x0 */
1659                 outb(DAC(thisboard->ao_n_chan - 1),
1660                      dev->iobase + DAS1800_SELECT);
1661                 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1662         }
1663
1664         return 0;
1665 };
1666
1667 static void das1800_detach(struct comedi_device *dev)
1668 {
1669         struct das1800_private *devpriv = dev->private;
1670
1671         if (devpriv) {
1672                 if (devpriv->dma0)
1673                         free_dma(devpriv->dma0);
1674                 if (devpriv->dma1)
1675                         free_dma(devpriv->dma1);
1676                 kfree(devpriv->ai_buf0);
1677                 kfree(devpriv->ai_buf1);
1678                 if (devpriv->iobase2)
1679                         release_region(devpriv->iobase2, DAS1800_SIZE);
1680         }
1681         comedi_legacy_detach(dev);
1682 }
1683
1684 static struct comedi_driver das1800_driver = {
1685         .driver_name    = "das1800",
1686         .module         = THIS_MODULE,
1687         .attach         = das1800_attach,
1688         .detach         = das1800_detach,
1689         .num_names      = ARRAY_SIZE(das1800_boards),
1690         .board_name     = &das1800_boards[0].name,
1691         .offset         = sizeof(struct das1800_board),
1692 };
1693 module_comedi_driver(das1800_driver);
1694
1695 MODULE_AUTHOR("Comedi http://www.comedi.org");
1696 MODULE_DESCRIPTION("Comedi low-level driver");
1697 MODULE_LICENSE("GPL");