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 /*
 433  * Useful for shorthand access to the particular board structure
 434  */
 435 #define thisboard ((const struct das1800_board *)dev->board_ptr)
 436
 437 struct das1800_private {
 438         volatile unsigned int count;    /* number of data points left to be taken */
 439         unsigned int divisor1;  /* value to load into board's counter 1 for timed conversions */
 440         unsigned int divisor2;  /* value to load into board's counter 2 for timed conversions */
 441         int do_bits;            /* digital output bits */
 442         int irq_dma_bits;       /* bits for control register b */
 443         /* dma bits for control register b, stored so that dma can be
 444          * turned on and off */
 445         int dma_bits;
 446         unsigned int dma0;      /* dma channels used */
 447         unsigned int dma1;
 448         volatile unsigned int dma_current;      /* dma channel currently in use */
 449         uint16_t *ai_buf0;      /* pointers to dma buffers */
 450         uint16_t *ai_buf1;
 451         uint16_t *dma_current_buf;      /* pointer to dma buffer currently being used */
 452         unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
 453         unsigned long iobase2;  /* secondary io address used for analog out on 'ao' boards */
 454         short ao_update_bits;   /* remembers the last write to the 'update' dac */
 455 };
 456
 457 #define devpriv ((struct das1800_private *)dev->private)
 458
 459 /* analog out range for boards with basic analog out */
 460 static const struct comedi_lrange range_ao_1 = {
 461         1,
 462         {
 463          RANGE(-10, 10),
 464          }
 465 };
 466
 467 /* analog out range for 'ao' boards */
 468 /*
 469 static const struct comedi_lrange range_ao_2 = {
 470         2,
 471         {
 472                 RANGE(-10, 10),
 473                 RANGE(-5, 5),
 474         }
 475 };
 476 */
 477
 478 static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
 479                                             uint16_t sample)
 480 {
 481         sample += 1 << (thisboard->resolution - 1);
 482         return sample;
 483 }
 484
 485 static void munge_data(struct comedi_device *dev, uint16_t * array,
 486                        unsigned int num_elements)
 487 {
 488         unsigned int i;
 489         int unipolar;
 490
 491         /* see if card is using a unipolar or bipolar range so we can munge data correctly */
 492         unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
 493
 494         /* convert to unsigned type if we are in a bipolar mode */
 495         if (!unipolar) {
 496                 for (i = 0; i < num_elements; i++)
 497                         array[i] = munge_bipolar_sample(dev, array[i]);
 498         }
 499 }
 500
 501 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
 502                                           struct comedi_subdevice *s)
 503 {
 504         int numPoints = 0;      /* number of points to read */
 505         struct comedi_cmd *cmd = &s->async->cmd;
 506
 507         numPoints = FIFO_SIZE / 2;
 508         /* if we only need some of the points */
 509         if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
 510                 numPoints = devpriv->count;
 511         insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
 512         munge_data(dev, devpriv->ai_buf0, numPoints);
 513         cfc_write_array_to_buffer(s, devpriv->ai_buf0,
 514                                   numPoints * sizeof(devpriv->ai_buf0[0]));
 515         if (cmd->stop_src == TRIG_COUNT)
 516                 devpriv->count -= numPoints;
 517         return;
 518 }
 519
 520 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
 521                                           struct comedi_subdevice *s)
 522 {
 523         short dpnt;
 524         int unipolar;
 525         struct comedi_cmd *cmd = &s->async->cmd;
 526
 527         unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
 528
 529         while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
 530                 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
 531                         break;
 532                 dpnt = inw(dev->iobase + DAS1800_FIFO);
 533                 /* convert to unsigned type if we are in a bipolar mode */
 534                 if (!unipolar)
 535                         ;
 536                 dpnt = munge_bipolar_sample(dev, dpnt);
 537                 cfc_write_to_buffer(s, dpnt);
 538                 if (cmd->stop_src == TRIG_COUNT)
 539                         devpriv->count--;
 540         }
 541
 542         return;
 543 }
 544
 545 /* Utility function used by das1800_flush_dma() and das1800_handle_dma().
 546  * Assumes dma lock is held */
 547 static void das1800_flush_dma_channel(struct comedi_device *dev,
 548                                       struct comedi_subdevice *s,
 549                                       unsigned int channel, uint16_t *buffer)
 550 {
 551         unsigned int num_bytes, num_samples;
 552         struct comedi_cmd *cmd = &s->async->cmd;
 553
 554         disable_dma(channel);
 555
 556         /* clear flip-flop to make sure 2-byte registers
 557          * get set correctly */
 558         clear_dma_ff(channel);
 559
 560         /*  figure out how many points to read */
 561         num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
 562         num_samples = num_bytes / sizeof(short);
 563
 564         /* if we only need some of the points */
 565         if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
 566                 num_samples = devpriv->count;
 567
 568         munge_data(dev, buffer, num_samples);
 569         cfc_write_array_to_buffer(s, buffer, num_bytes);
 570         if (s->async->cmd.stop_src == TRIG_COUNT)
 571                 devpriv->count -= num_samples;
 572
 573         return;
 574 }
 575
 576 /* flushes remaining data from board when external trigger has stopped acquisition
 577  * and we are using dma transfers */
 578 static void das1800_flush_dma(struct comedi_device *dev,
 579                               struct comedi_subdevice *s)
 580 {
 581         unsigned long flags;
 582         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
 583
 584         flags = claim_dma_lock();
 585         das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 586                                   devpriv->dma_current_buf);
 587
 588         if (dual_dma) {
 589                 /*  switch to other channel and flush it */
 590                 if (devpriv->dma_current == devpriv->dma0) {
 591                         devpriv->dma_current = devpriv->dma1;
 592                         devpriv->dma_current_buf = devpriv->ai_buf1;
 593                 } else {
 594                         devpriv->dma_current = devpriv->dma0;
 595                         devpriv->dma_current_buf = devpriv->ai_buf0;
 596                 }
 597                 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 598                                           devpriv->dma_current_buf);
 599         }
 600
 601         release_dma_lock(flags);
 602
 603         /*  get any remaining samples in fifo */
 604         das1800_handle_fifo_not_empty(dev, s);
 605
 606         return;
 607 }
 608
 609 static void das1800_handle_dma(struct comedi_device *dev,
 610                                struct comedi_subdevice *s, unsigned int status)
 611 {
 612         unsigned long flags;
 613         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
 614
 615         flags = claim_dma_lock();
 616         das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 617                                   devpriv->dma_current_buf);
 618         /*  re-enable  dma channel */
 619         set_dma_addr(devpriv->dma_current,
 620                      virt_to_bus(devpriv->dma_current_buf));
 621         set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
 622         enable_dma(devpriv->dma_current);
 623         release_dma_lock(flags);
 624
 625         if (status & DMATC) {
 626                 /*  clear DMATC interrupt bit */
 627                 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
 628                 /*  switch dma channels for next time, if appropriate */
 629                 if (dual_dma) {
 630                         /*  read data from the other channel next time */
 631                         if (devpriv->dma_current == devpriv->dma0) {
 632                                 devpriv->dma_current = devpriv->dma1;
 633                                 devpriv->dma_current_buf = devpriv->ai_buf1;
 634                         } else {
 635                                 devpriv->dma_current = devpriv->dma0;
 636                                 devpriv->dma_current_buf = devpriv->ai_buf0;
 637                         }
 638                 }
 639         }
 640
 641         return;
 642 }
 643
 644 static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
 645 {
 646         outb(0x0, dev->iobase + DAS1800_STATUS);        /* disable conversions */
 647         outb(0x0, dev->iobase + DAS1800_CONTROL_B);     /* disable interrupts and dma */
 648         outb(0x0, dev->iobase + DAS1800_CONTROL_A);     /* disable and clear fifo and stop triggering */
 649         if (devpriv->dma0)
 650                 disable_dma(devpriv->dma0);
 651         if (devpriv->dma1)
 652                 disable_dma(devpriv->dma1);
 653         return 0;
 654 }
 655
 656 /* the guts of the interrupt handler, that is shared with das1800_ai_poll */
 657 static void das1800_ai_handler(struct comedi_device *dev)
 658 {
 659         struct comedi_subdevice *s = &dev->subdevices[0];
 660         struct comedi_async *async = s->async;
 661         struct comedi_cmd *cmd = &async->cmd;
 662         unsigned int status = inb(dev->iobase + DAS1800_STATUS);
 663
 664         async->events = 0;
 665         /*  select adc for base address + 0 */
 666         outb(ADC, dev->iobase + DAS1800_SELECT);
 667         /*  dma buffer full */
 668         if (devpriv->irq_dma_bits & DMA_ENABLED) {
 669                 /*  look for data from dma transfer even if dma terminal count hasn't happened yet */
 670                 das1800_handle_dma(dev, s, status);
 671         } else if (status & FHF) {      /*  if fifo half full */
 672                 das1800_handle_fifo_half_full(dev, s);
 673         } else if (status & FNE) {      /*  if fifo not empty */
 674                 das1800_handle_fifo_not_empty(dev, s);
 675         }
 676
 677         async->events |= COMEDI_CB_BLOCK;
 678         /* if the card's fifo has overflowed */
 679         if (status & OVF) {
 680                 /*  clear OVF interrupt bit */
 681                 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
 682                 comedi_error(dev, "DAS1800 FIFO overflow");
 683                 das1800_cancel(dev, s);
 684                 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
 685                 comedi_event(dev, s);
 686                 return;
 687         }
 688         /*  stop taking data if appropriate */
 689         /* stop_src TRIG_EXT */
 690         if (status & CT0TC) {
 691                 /*  clear CT0TC interrupt bit */
 692                 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
 693                 /*  make sure we get all remaining data from board before quitting */
 694                 if (devpriv->irq_dma_bits & DMA_ENABLED)
 695                         das1800_flush_dma(dev, s);
 696                 else
 697                         das1800_handle_fifo_not_empty(dev, s);
 698                 das1800_cancel(dev, s); /* disable hardware conversions */
 699                 async->events |= COMEDI_CB_EOA;
 700         } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) {        /*  stop_src TRIG_COUNT */
 701                 das1800_cancel(dev, s); /* disable hardware conversions */
 702                 async->events |= COMEDI_CB_EOA;
 703         }
 704
 705         comedi_event(dev, s);
 706
 707         return;
 708 }
 709
 710 static int das1800_ai_poll(struct comedi_device *dev,
 711                            struct comedi_subdevice *s)
 712 {
 713         unsigned long flags;
 714
 715         /*  prevent race with interrupt handler */
 716         spin_lock_irqsave(&dev->spinlock, flags);
 717         das1800_ai_handler(dev);
 718         spin_unlock_irqrestore(&dev->spinlock, flags);
 719
 720         return s->async->buf_write_count - s->async->buf_read_count;
 721 }
 722
 723 static irqreturn_t das1800_interrupt(int irq, void *d)
 724 {
 725         struct comedi_device *dev = d;
 726         unsigned int status;
 727
 728         if (dev->attached == 0) {
 729                 comedi_error(dev, "premature interrupt");
 730                 return IRQ_HANDLED;
 731         }
 732
 733         /* Prevent race with das1800_ai_poll() on multi processor systems.
 734          * Also protects indirect addressing in das1800_ai_handler */
 735         spin_lock(&dev->spinlock);
 736         status = inb(dev->iobase + DAS1800_STATUS);
 737
 738         /* if interrupt was not caused by das-1800 */
 739         if (!(status & INT)) {
 740                 spin_unlock(&dev->spinlock);
 741                 return IRQ_NONE;
 742         }
 743         /* clear the interrupt status bit INT */
 744         outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
 745         /*  handle interrupt */
 746         das1800_ai_handler(dev);
 747
 748         spin_unlock(&dev->spinlock);
 749         return IRQ_HANDLED;
 750 }
 751
 752 /* converts requested conversion timing to timing compatible with
 753  * hardware, used only when card is in 'burst mode'
 754  */
 755 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
 756 {
 757         unsigned int micro_sec;
 758
 759         /*  in burst mode, the maximum conversion time is 64 microseconds */
 760         if (convert_arg > 64000)
 761                 convert_arg = 64000;
 762
 763         /*  the conversion time must be an integral number of microseconds */
 764         switch (round_mode) {
 765         case TRIG_ROUND_NEAREST:
 766         default:
 767                 micro_sec = (convert_arg + 500) / 1000;
 768                 break;
 769         case TRIG_ROUND_DOWN:
 770                 micro_sec = convert_arg / 1000;
 771                 break;
 772         case TRIG_ROUND_UP:
 773                 micro_sec = (convert_arg - 1) / 1000 + 1;
 774                 break;
 775         }
 776
 777         /*  return number of nanoseconds */
 778         return micro_sec * 1000;
 779 }
 780
 781 /* test analog input cmd */
 782 static int das1800_ai_do_cmdtest(struct comedi_device *dev,
 783                                  struct comedi_subdevice *s,
 784                                  struct comedi_cmd *cmd)
 785 {
 786         int err = 0;
 787         unsigned int tmp_arg;
 788         int i;
 789         int unipolar;
 790
 791         /* Step 1 : check if triggers are trivially valid */
 792
 793         err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT);
 794         err |= cfc_check_trigger_src(&cmd->scan_begin_src,
 795                                         TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT);
 796         err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER | TRIG_EXT);
 797         err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
 798         err |= cfc_check_trigger_src(&cmd->stop_src,
 799                                         TRIG_COUNT | TRIG_EXT | TRIG_NONE);
 800
 801         if (err)
 802                 return 1;
 803
 804         /* Step 2a : make sure trigger sources are unique */
 805
 806         err |= cfc_check_trigger_is_unique(cmd->start_src);
 807         err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
 808         err |= cfc_check_trigger_is_unique(cmd->convert_src);
 809         err |= cfc_check_trigger_is_unique(cmd->stop_src);
 810
 811         /* Step 2b : and mutually compatible */
 812
 813         if (cmd->scan_begin_src != TRIG_FOLLOW &&
 814             cmd->convert_src != TRIG_TIMER)
 815                 err |= -EINVAL;
 816
 817         if (err)
 818                 return 2;
 819
 820         /* step 3: make sure arguments are trivially compatible */
 821
 822         if (cmd->start_arg != 0) {
 823                 cmd->start_arg = 0;
 824                 err++;
 825         }
 826         if (cmd->convert_src == TRIG_TIMER) {
 827                 if (cmd->convert_arg < thisboard->ai_speed) {
 828                         cmd->convert_arg = thisboard->ai_speed;
 829                         err++;
 830                 }
 831         }
 832         if (!cmd->chanlist_len) {
 833                 cmd->chanlist_len = 1;
 834                 err++;
 835         }
 836         if (cmd->scan_end_arg != cmd->chanlist_len) {
 837                 cmd->scan_end_arg = cmd->chanlist_len;
 838                 err++;
 839         }
 840
 841         switch (cmd->stop_src) {
 842         case TRIG_COUNT:
 843                 if (!cmd->stop_arg) {
 844                         cmd->stop_arg = 1;
 845                         err++;
 846                 }
 847                 break;
 848         case TRIG_NONE:
 849                 if (cmd->stop_arg != 0) {
 850                         cmd->stop_arg = 0;
 851                         err++;
 852                 }
 853                 break;
 854         default:
 855                 break;
 856         }
 857
 858         if (err)
 859                 return 3;
 860
 861         /* step 4: fix up any arguments */
 862
 863         if (cmd->convert_src == TRIG_TIMER) {
 864                 /*  if we are not in burst mode */
 865                 if (cmd->scan_begin_src == TRIG_FOLLOW) {
 866                         tmp_arg = cmd->convert_arg;
 867                         /* calculate counter values that give desired timing */
 868                         i8253_cascade_ns_to_timer_2div(TIMER_BASE,
 869                                                        &(devpriv->divisor1),
 870                                                        &(devpriv->divisor2),
 871                                                        &(cmd->convert_arg),
 872                                                        cmd->
 873                                                        flags & TRIG_ROUND_MASK);
 874                         if (tmp_arg != cmd->convert_arg)
 875                                 err++;
 876                 }
 877                 /*  if we are in burst mode */
 878                 else {
 879                         /*  check that convert_arg is compatible */
 880                         tmp_arg = cmd->convert_arg;
 881                         cmd->convert_arg =
 882                             burst_convert_arg(cmd->convert_arg,
 883                                               cmd->flags & TRIG_ROUND_MASK);
 884                         if (tmp_arg != cmd->convert_arg)
 885                                 err++;
 886
 887                         if (cmd->scan_begin_src == TRIG_TIMER) {
 888                                 /*  if scans are timed faster than conversion rate allows */
 889                                 if (cmd->convert_arg * cmd->chanlist_len >
 890                                     cmd->scan_begin_arg) {
 891                                         cmd->scan_begin_arg =
 892                                             cmd->convert_arg *
 893                                             cmd->chanlist_len;
 894                                         err++;
 895                                 }
 896                                 tmp_arg = cmd->scan_begin_arg;
 897                                 /* calculate counter values that give desired timing */
 898                                 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
 899                                                                &(devpriv->
 900                                                                  divisor1),
 901                                                                &(devpriv->
 902                                                                  divisor2),
 903                                                                &(cmd->
 904                                                                  scan_begin_arg),
 905                                                                cmd->
 906                                                                flags &
 907                                                                TRIG_ROUND_MASK);
 908                                 if (tmp_arg != cmd->scan_begin_arg)
 909                                         err++;
 910                         }
 911                 }
 912         }
 913
 914         if (err)
 915                 return 4;
 916
 917         /*  make sure user is not trying to mix unipolar and bipolar ranges */
 918         if (cmd->chanlist) {
 919                 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
 920                 for (i = 1; i < cmd->chanlist_len; i++) {
 921                         if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
 922                                 comedi_error(dev,
 923                                              "unipolar and bipolar ranges cannot be mixed in the chanlist");
 924                                 err++;
 925                                 break;
 926                         }
 927                 }
 928         }
 929
 930         if (err)
 931                 return 5;
 932
 933         return 0;
 934 }
 935
 936 /* returns appropriate bits for control register a, depending on command */
 937 static int control_a_bits(const struct comedi_cmd *cmd)
 938 {
 939         int control_a;
 940
 941         control_a = FFEN;       /* enable fifo */
 942         if (cmd->stop_src == TRIG_EXT)
 943                 control_a |= ATEN;
 944         switch (cmd->start_src) {
 945         case TRIG_EXT:
 946                 control_a |= TGEN | CGSL;
 947                 break;
 948         case TRIG_NOW:
 949                 control_a |= CGEN;
 950                 break;
 951         default:
 952                 break;
 953         }
 954
 955         return control_a;
 956 }
 957
 958 /* returns appropriate bits for control register c, depending on command */
 959 static int control_c_bits(const struct comedi_cmd *cmd)
 960 {
 961         int control_c;
 962         int aref;
 963
 964         /* set clock source to internal or external, select analog reference,
 965          * select unipolar / bipolar
 966          */
 967         aref = CR_AREF(cmd->chanlist[0]);
 968         control_c = UQEN;       /* enable upper qram addresses */
 969         if (aref != AREF_DIFF)
 970                 control_c |= SD;
 971         if (aref == AREF_COMMON)
 972                 control_c |= CMEN;
 973         /* if a unipolar range was selected */
 974         if (CR_RANGE(cmd->chanlist[0]) & UNIPOLAR)
 975                 control_c |= UB;
 976         switch (cmd->scan_begin_src) {
 977         case TRIG_FOLLOW:       /*  not in burst mode */
 978                 switch (cmd->convert_src) {
 979                 case TRIG_TIMER:
 980                         /* trig on cascaded counters */
 981                         control_c |= IPCLK;
 982                         break;
 983                 case TRIG_EXT:
 984                         /* trig on falling edge of external trigger */
 985                         control_c |= XPCLK;
 986                         break;
 987                 default:
 988                         break;
 989                 }
 990                 break;
 991         case TRIG_TIMER:
 992                 /*  burst mode with internal pacer clock */
 993                 control_c |= BMDE | IPCLK;
 994                 break;
 995         case TRIG_EXT:
 996                 /*  burst mode with external trigger */
 997                 control_c |= BMDE | XPCLK;
 998                 break;
 999         default:
1000                 break;
1001         }
1002
1003         return control_c;
1004 }
1005
1006 /* loads counters with divisor1, divisor2 from private structure */
1007 static int das1800_set_frequency(struct comedi_device *dev)
1008 {
1009         int err = 0;
1010
1011         /*  counter 1, mode 2 */
1012         if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
1013                        2))
1014                 err++;
1015         /*  counter 2, mode 2 */
1016         if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
1017                        2))
1018                 err++;
1019         if (err)
1020                 return -1;
1021
1022         return 0;
1023 }
1024
1025 /* sets up counters */
1026 static int setup_counters(struct comedi_device *dev,
1027                           const struct comedi_cmd *cmd)
1028 {
1029         unsigned int period;
1030
1031         /*  setup cascaded counters for conversion/scan frequency */
1032         switch (cmd->scan_begin_src) {
1033         case TRIG_FOLLOW:       /*  not in burst mode */
1034                 if (cmd->convert_src == TRIG_TIMER) {
1035                         /* set conversion frequency */
1036                         period = cmd->convert_arg;
1037                         i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1038                                                        &devpriv->divisor1,
1039                                                        &devpriv->divisor2,
1040                                                        &period,
1041                                                        cmd->flags &
1042                                                         TRIG_ROUND_MASK);
1043                         if (das1800_set_frequency(dev) < 0)
1044                                 return -1;
1045                 }
1046                 break;
1047         case TRIG_TIMER:        /*  in burst mode */
1048                 /* set scan frequency */
1049                 period = cmd->scan_begin_arg;
1050                 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &devpriv->divisor1,
1051                                                &devpriv->divisor2, &period,
1052                                                cmd->flags & TRIG_ROUND_MASK);
1053                 if (das1800_set_frequency(dev) < 0)
1054                         return -1;
1055                 break;
1056         default:
1057                 break;
1058         }
1059
1060         /*  setup counter 0 for 'about triggering' */
1061         if (cmd->stop_src == TRIG_EXT) {
1062                 /*  load counter 0 in mode 0 */
1063                 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1064         }
1065
1066         return 0;
1067 }
1068
1069 /* utility function that suggests a dma transfer size based on the conversion period 'ns' */
1070 static unsigned int suggest_transfer_size(const struct comedi_cmd *cmd)
1071 {
1072         unsigned int size = DMA_BUF_SIZE;
1073         static const int sample_size = 2;       /*  size in bytes of one sample from board */
1074         unsigned int fill_time = 300000000;     /*  target time in nanoseconds for filling dma buffer */
1075         unsigned int max_size;  /*  maximum size we will allow for a transfer */
1076
1077         /*  make dma buffer fill in 0.3 seconds for timed modes */
1078         switch (cmd->scan_begin_src) {
1079         case TRIG_FOLLOW:       /*  not in burst mode */
1080                 if (cmd->convert_src == TRIG_TIMER)
1081                         size = (fill_time / cmd->convert_arg) * sample_size;
1082                 break;
1083         case TRIG_TIMER:
1084                 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
1085                     sample_size;
1086                 break;
1087         default:
1088                 size = DMA_BUF_SIZE;
1089                 break;
1090         }
1091
1092         /*  set a minimum and maximum size allowed */
1093         max_size = DMA_BUF_SIZE;
1094         /*  if we are taking limited number of conversions, limit transfer size to that */
1095         if (cmd->stop_src == TRIG_COUNT &&
1096             cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
1097                 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1098
1099         if (size > max_size)
1100                 size = max_size;
1101         if (size < sample_size)
1102                 size = sample_size;
1103
1104         return size;
1105 }
1106
1107 /* sets up dma */
1108 static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd)
1109 {
1110         unsigned long lock_flags;
1111         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1112
1113         if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1114                 return;
1115
1116         /* determine a reasonable dma transfer size */
1117         devpriv->dma_transfer_size = suggest_transfer_size(cmd);
1118         lock_flags = claim_dma_lock();
1119         disable_dma(devpriv->dma0);
1120         /* clear flip-flop to make sure 2-byte registers for
1121          * count and address get set correctly */
1122         clear_dma_ff(devpriv->dma0);
1123         set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
1124         /*  set appropriate size of transfer */
1125         set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1126         devpriv->dma_current = devpriv->dma0;
1127         devpriv->dma_current_buf = devpriv->ai_buf0;
1128         enable_dma(devpriv->dma0);
1129         /*  set up dual dma if appropriate */
1130         if (dual_dma) {
1131                 disable_dma(devpriv->dma1);
1132                 /* clear flip-flop to make sure 2-byte registers for
1133                  * count and address get set correctly */
1134                 clear_dma_ff(devpriv->dma1);
1135                 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
1136                 /*  set appropriate size of transfer */
1137                 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1138                 enable_dma(devpriv->dma1);
1139         }
1140         release_dma_lock(lock_flags);
1141
1142         return;
1143 }
1144
1145 /* programs channel/gain list into card */
1146 static void program_chanlist(struct comedi_device *dev,
1147                              const struct comedi_cmd *cmd)
1148 {
1149         int i, n, chan_range;
1150         unsigned long irq_flags;
1151         const int range_mask = 0x3;     /* masks unipolar/bipolar bit off range */
1152         const int range_bitshift = 8;
1153
1154         n = cmd->chanlist_len;
1155         /*  spinlock protects indirect addressing */
1156         spin_lock_irqsave(&dev->spinlock, irq_flags);
1157         outb(QRAM, dev->iobase + DAS1800_SELECT);       /* select QRAM for baseAddress + 0x0 */
1158         outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);        /*set QRAM address start */
1159         /* make channel / gain list */
1160         for (i = 0; i < n; i++) {
1161                 chan_range =
1162                     CR_CHAN(cmd->chanlist[i]) |
1163                     ((CR_RANGE(cmd->chanlist[i]) & range_mask) <<
1164                      range_bitshift);
1165                 outw(chan_range, dev->iobase + DAS1800_QRAM);
1166         }
1167         outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);        /*finish write to QRAM */
1168         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1169
1170         return;
1171 }
1172
1173 /* analog input do_cmd */
1174 static int das1800_ai_do_cmd(struct comedi_device *dev,
1175                              struct comedi_subdevice *s)
1176 {
1177         int ret;
1178         int control_a, control_c;
1179         struct comedi_async *async = s->async;
1180         const struct comedi_cmd *cmd = &async->cmd;
1181
1182         if (!dev->irq) {
1183                 comedi_error(dev,
1184                              "no irq assigned for das-1800, cannot do hardware conversions");
1185                 return -1;
1186         }
1187
1188         /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1189          * (because dma in handler is unsafe at hard real-time priority) */
1190         if (cmd->flags & (TRIG_WAKE_EOS | TRIG_RT))
1191                 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1192         else
1193                 devpriv->irq_dma_bits |= devpriv->dma_bits;
1194         /*  interrupt on end of conversion for TRIG_WAKE_EOS */
1195         if (cmd->flags & TRIG_WAKE_EOS) {
1196                 /*  interrupt fifo not empty */
1197                 devpriv->irq_dma_bits &= ~FIMD;
1198         } else {
1199                 /*  interrupt fifo half full */
1200                 devpriv->irq_dma_bits |= FIMD;
1201         }
1202         /*  determine how many conversions we need */
1203         if (cmd->stop_src == TRIG_COUNT)
1204                 devpriv->count = cmd->stop_arg * cmd->chanlist_len;
1205
1206         das1800_cancel(dev, s);
1207
1208         /*  determine proper bits for control registers */
1209         control_a = control_a_bits(cmd);
1210         control_c = control_c_bits(cmd);
1211
1212         /* setup card and start */
1213         program_chanlist(dev, cmd);
1214         ret = setup_counters(dev, cmd);
1215         if (ret < 0) {
1216                 comedi_error(dev, "Error setting up counters");
1217                 return ret;
1218         }
1219         setup_dma(dev, cmd);
1220         outb(control_c, dev->iobase + DAS1800_CONTROL_C);
1221         /*  set conversion rate and length for burst mode */
1222         if (control_c & BMDE) {
1223                 /*  program conversion period with number of microseconds minus 1 */
1224                 outb(cmd->convert_arg / 1000 - 1,
1225                      dev->iobase + DAS1800_BURST_RATE);
1226                 outb(cmd->chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1227         }
1228         outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B);   /*  enable irq/dma */
1229         outb(control_a, dev->iobase + DAS1800_CONTROL_A);       /* enable fifo and triggering */
1230         outb(CVEN, dev->iobase + DAS1800_STATUS);       /* enable conversions */
1231
1232         return 0;
1233 }
1234
1235 /* read analog input */
1236 static int das1800_ai_rinsn(struct comedi_device *dev,
1237                             struct comedi_subdevice *s,
1238                             struct comedi_insn *insn, unsigned int *data)
1239 {
1240         int i, n;
1241         int chan, range, aref, chan_range;
1242         int timeout = 1000;
1243         short dpnt;
1244         int conv_flags = 0;
1245         unsigned long irq_flags;
1246
1247         /* set up analog reference and unipolar / bipolar mode */
1248         aref = CR_AREF(insn->chanspec);
1249         conv_flags |= UQEN;
1250         if (aref != AREF_DIFF)
1251                 conv_flags |= SD;
1252         if (aref == AREF_COMMON)
1253                 conv_flags |= CMEN;
1254         /* if a unipolar range was selected */
1255         if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1256                 conv_flags |= UB;
1257
1258         outb(conv_flags, dev->iobase + DAS1800_CONTROL_C);      /* software conversion enabled */
1259         outb(CVEN, dev->iobase + DAS1800_STATUS);       /* enable conversions */
1260         outb(0x0, dev->iobase + DAS1800_CONTROL_A);     /* reset fifo */
1261         outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1262
1263         chan = CR_CHAN(insn->chanspec);
1264         /* mask of unipolar/bipolar bit from range */
1265         range = CR_RANGE(insn->chanspec) & 0x3;
1266         chan_range = chan | (range << 8);
1267         spin_lock_irqsave(&dev->spinlock, irq_flags);
1268         outb(QRAM, dev->iobase + DAS1800_SELECT);       /* select QRAM for baseAddress + 0x0 */
1269         outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);  /* set QRAM address start */
1270         outw(chan_range, dev->iobase + DAS1800_QRAM);
1271         outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);  /*finish write to QRAM */
1272         outb(ADC, dev->iobase + DAS1800_SELECT);        /* select ADC for baseAddress + 0x0 */
1273
1274         for (n = 0; n < insn->n; n++) {
1275                 /* trigger conversion */
1276                 outb(0, dev->iobase + DAS1800_FIFO);
1277                 for (i = 0; i < timeout; i++) {
1278                         if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1279                                 break;
1280                 }
1281                 if (i == timeout) {
1282                         comedi_error(dev, "timeout");
1283                         n = -ETIME;
1284                         goto exit;
1285                 }
1286                 dpnt = inw(dev->iobase + DAS1800_FIFO);
1287                 /* shift data to offset binary for bipolar ranges */
1288                 if ((conv_flags & UB) == 0)
1289                         dpnt += 1 << (thisboard->resolution - 1);
1290                 data[n] = dpnt;
1291         }
1292 exit:
1293         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1294
1295         return n;
1296 }
1297
1298 /* writes to an analog output channel */
1299 static int das1800_ao_winsn(struct comedi_device *dev,
1300                             struct comedi_subdevice *s,
1301                             struct comedi_insn *insn, unsigned int *data)
1302 {
1303         int chan = CR_CHAN(insn->chanspec);
1304 /* int range = CR_RANGE(insn->chanspec); */
1305         int update_chan = thisboard->ao_n_chan - 1;
1306         short output;
1307         unsigned long irq_flags;
1308
1309         /*   card expects two's complement data */
1310         output = data[0] - (1 << (thisboard->resolution - 1));
1311         /*  if the write is to the 'update' channel, we need to remember its value */
1312         if (chan == update_chan)
1313                 devpriv->ao_update_bits = output;
1314         /*  write to channel */
1315         spin_lock_irqsave(&dev->spinlock, irq_flags);
1316         outb(DAC(chan), dev->iobase + DAS1800_SELECT);  /* select dac channel for baseAddress + 0x0 */
1317         outw(output, dev->iobase + DAS1800_DAC);
1318         /*  now we need to write to 'update' channel to update all dac channels */
1319         if (chan != update_chan) {
1320                 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT);   /* select 'update' channel for baseAddress + 0x0 */
1321                 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1322         }
1323         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1324
1325         return 1;
1326 }
1327
1328 /* reads from digital input channels */
1329 static int das1800_di_rbits(struct comedi_device *dev,
1330                             struct comedi_subdevice *s,
1331                             struct comedi_insn *insn, unsigned int *data)
1332 {
1333
1334         data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1335         data[0] = 0;
1336
1337         return insn->n;
1338 }
1339
1340 /* writes to digital output channels */
1341 static int das1800_do_wbits(struct comedi_device *dev,
1342                             struct comedi_subdevice *s,
1343                             struct comedi_insn *insn, unsigned int *data)
1344 {
1345         unsigned int wbits;
1346
1347         /*  only set bits that have been masked */
1348         data[0] &= (1 << s->n_chan) - 1;
1349         wbits = devpriv->do_bits;
1350         wbits &= ~data[0];
1351         wbits |= data[0] & data[1];
1352         devpriv->do_bits = wbits;
1353
1354         outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1355
1356         data[1] = devpriv->do_bits;
1357
1358         return insn->n;
1359 }
1360
1361 static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
1362                             unsigned int dma1)
1363 {
1364         unsigned long flags;
1365
1366         /*  need an irq to do dma */
1367         if (dev->irq && dma0) {
1368                 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
1369                 switch ((dma0 & 0x7) | (dma1 << 4)) {
1370                 case 0x5:       /*  dma0 == 5 */
1371                         devpriv->dma_bits |= DMA_CH5;
1372                         break;
1373                 case 0x6:       /*  dma0 == 6 */
1374                         devpriv->dma_bits |= DMA_CH6;
1375                         break;
1376                 case 0x7:       /*  dma0 == 7 */
1377                         devpriv->dma_bits |= DMA_CH7;
1378                         break;
1379                 case 0x65:      /*  dma0 == 5, dma1 == 6 */
1380                         devpriv->dma_bits |= DMA_CH5_CH6;
1381                         break;
1382                 case 0x76:      /*  dma0 == 6, dma1 == 7 */
1383                         devpriv->dma_bits |= DMA_CH6_CH7;
1384                         break;
1385                 case 0x57:      /*  dma0 == 7, dma1 == 5 */
1386                         devpriv->dma_bits |= DMA_CH7_CH5;
1387                         break;
1388                 default:
1389                         dev_err(dev->class_dev,
1390                                 "only supports dma channels 5 through 7\n");
1391                         dev_err(dev->class_dev,
1392                                 "Dual dma only allows the following combinations:\n");
1393                         dev_err(dev->class_dev,
1394                                 "dma 5,6 / 6,7 / or 7,5\n");
1395                         return -EINVAL;
1396                         break;
1397                 }
1398                 if (request_dma(dma0, dev->driver->driver_name)) {
1399                         dev_err(dev->class_dev,
1400                                 "failed to allocate dma channel %i\n", dma0);
1401                         return -EINVAL;
1402                 }
1403                 devpriv->dma0 = dma0;
1404                 devpriv->dma_current = dma0;
1405                 if (dma1) {
1406                         if (request_dma(dma1, dev->driver->driver_name)) {
1407                                 dev_err(dev->class_dev,
1408                                         "failed to allocate dma channel %i\n",
1409                                         dma1);
1410                                 return -EINVAL;
1411                         }
1412                         devpriv->dma1 = dma1;
1413                 }
1414                 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1415                 if (devpriv->ai_buf0 == NULL)
1416                         return -ENOMEM;
1417                 devpriv->dma_current_buf = devpriv->ai_buf0;
1418                 if (dma1) {
1419                         devpriv->ai_buf1 =
1420                             kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1421                         if (devpriv->ai_buf1 == NULL)
1422                                 return -ENOMEM;
1423                 }
1424                 flags = claim_dma_lock();
1425                 disable_dma(devpriv->dma0);
1426                 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
1427                 if (dma1) {
1428                         disable_dma(devpriv->dma1);
1429                         set_dma_mode(devpriv->dma1, DMA_MODE_READ);
1430                 }
1431                 release_dma_lock(flags);
1432         }
1433         return 0;
1434 }
1435
1436 static int das1800_probe(struct comedi_device *dev)
1437 {
1438         int id;
1439         int board;
1440
1441         id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf;   /* get id bits */
1442         board = ((struct das1800_board *)dev->board_ptr) - das1800_boards;
1443
1444         switch (id) {
1445         case 0x3:
1446                 if (board == das1801st_da || board == das1802st_da ||
1447                     board == das1701st_da || board == das1702st_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-1800st-da series\n");
1454                 return das1801st;
1455                 break;
1456         case 0x4:
1457                 if (board == das1802hr_da || board == das1702hr_da) {
1458                         dev_dbg(dev->class_dev, "Board model: %s\n",
1459                                 das1800_boards[board].name);
1460                         return board;
1461                 }
1462                 printk
1463                     (" Board model (probed, not recommended): das-1802hr-da\n");
1464                 return das1802hr;
1465                 break;
1466         case 0x5:
1467                 if (board == das1801ao || board == das1802ao ||
1468                     board == das1701ao || board == das1702ao) {
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-1800ao series\n");
1475                 return das1801ao;
1476                 break;
1477         case 0x6:
1478                 if (board == das1802hr || board == das1702hr) {
1479                         dev_dbg(dev->class_dev, "Board model: %s\n",
1480                                 das1800_boards[board].name);
1481                         return board;
1482                 }
1483                 printk
1484                     (" Board model (probed, not recommended): das-1802hr\n");
1485                 return das1802hr;
1486                 break;
1487         case 0x7:
1488                 if (board == das1801st || board == das1802st ||
1489                     board == das1701st || board == das1702st) {
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-1800st series\n");
1496                 return das1801st;
1497                 break;
1498         case 0x8:
1499                 if (board == das1801hc || board == das1802hc) {
1500                         dev_dbg(dev->class_dev, "Board model: %s\n",
1501                                 das1800_boards[board].name);
1502                         return board;
1503                 }
1504                 printk
1505                     (" Board model (probed, not recommended): das-1800hc series\n");
1506                 return das1801hc;
1507                 break;
1508         default:
1509                 printk
1510                     (" Board model: probe returned 0x%x (unknown, please report)\n",
1511                      id);
1512                 return board;
1513                 break;
1514         }
1515         return -1;
1516 }
1517
1518 static int das1800_attach(struct comedi_device *dev,
1519                           struct comedi_devconfig *it)
1520 {
1521         struct comedi_subdevice *s;
1522         unsigned long iobase = it->options[0];
1523         unsigned int irq = it->options[1];
1524         unsigned int dma0 = it->options[2];
1525         unsigned int dma1 = it->options[3];
1526         unsigned long iobase2;
1527         int board;
1528         int retval;
1529
1530         /* allocate and initialize dev->private */
1531         if (alloc_private(dev, sizeof(struct das1800_private)) < 0)
1532                 return -ENOMEM;
1533
1534         printk(KERN_DEBUG "comedi%d: %s: io 0x%lx", dev->minor,
1535                dev->driver->driver_name, iobase);
1536         if (irq) {
1537                 printk(KERN_CONT ", irq %u", irq);
1538                 if (dma0) {
1539                         printk(KERN_CONT ", dma %u", dma0);
1540                         if (dma1)
1541                                 printk(KERN_CONT " and %u", dma1);
1542                 }
1543         }
1544         printk(KERN_CONT "\n");
1545
1546         if (iobase == 0) {
1547                 dev_err(dev->class_dev, "io base address required\n");
1548                 return -EINVAL;
1549         }
1550
1551         /* check if io addresses are available */
1552         if (!request_region(iobase, DAS1800_SIZE, dev->driver->driver_name)) {
1553                 printk
1554                     (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
1555                      iobase, iobase + DAS1800_SIZE - 1);
1556                 return -EIO;
1557         }
1558         dev->iobase = iobase;
1559
1560         board = das1800_probe(dev);
1561         if (board < 0) {
1562                 dev_err(dev->class_dev, "unable to determine board type\n");
1563                 return -ENODEV;
1564         }
1565
1566         dev->board_ptr = das1800_boards + board;
1567         dev->board_name = thisboard->name;
1568
1569         /*  if it is an 'ao' board with fancy analog out then we need extra io ports */
1570         if (thisboard->ao_ability == 2) {
1571                 iobase2 = iobase + IOBASE2;
1572                 if (!request_region(iobase2, DAS1800_SIZE,
1573                                     dev->driver->driver_name)) {
1574                         printk
1575                             (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
1576                              iobase2, iobase2 + DAS1800_SIZE - 1);
1577                         return -EIO;
1578                 }
1579                 devpriv->iobase2 = iobase2;
1580         }
1581
1582         /* grab our IRQ */
1583         if (irq) {
1584                 if (request_irq(irq, das1800_interrupt, 0,
1585                                 dev->driver->driver_name, dev)) {
1586                         dev_dbg(dev->class_dev, "unable to allocate irq %u\n",
1587                                 irq);
1588                         return -EINVAL;
1589                 }
1590         }
1591         dev->irq = irq;
1592
1593         /*  set bits that tell card which irq to use */
1594         switch (irq) {
1595         case 0:
1596                 break;
1597         case 3:
1598                 devpriv->irq_dma_bits |= 0x8;
1599                 break;
1600         case 5:
1601                 devpriv->irq_dma_bits |= 0x10;
1602                 break;
1603         case 7:
1604                 devpriv->irq_dma_bits |= 0x18;
1605                 break;
1606         case 10:
1607                 devpriv->irq_dma_bits |= 0x28;
1608                 break;
1609         case 11:
1610                 devpriv->irq_dma_bits |= 0x30;
1611                 break;
1612         case 15:
1613                 devpriv->irq_dma_bits |= 0x38;
1614                 break;
1615         default:
1616                 dev_err(dev->class_dev, "irq out of range\n");
1617                 return -EINVAL;
1618                 break;
1619         }
1620
1621         retval = das1800_init_dma(dev, dma0, dma1);
1622         if (retval < 0)
1623                 return retval;
1624
1625         if (devpriv->ai_buf0 == NULL) {
1626                 devpriv->ai_buf0 =
1627                     kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
1628                 if (devpriv->ai_buf0 == NULL)
1629                         return -ENOMEM;
1630         }
1631
1632         retval = comedi_alloc_subdevices(dev, 4);
1633         if (retval)
1634                 return retval;
1635
1636         /* analog input subdevice */
1637         s = &dev->subdevices[0];
1638         dev->read_subdev = s;
1639         s->type = COMEDI_SUBD_AI;
1640         s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
1641         if (thisboard->common)
1642                 s->subdev_flags |= SDF_COMMON;
1643         s->n_chan = thisboard->qram_len;
1644         s->len_chanlist = thisboard->qram_len;
1645         s->maxdata = (1 << thisboard->resolution) - 1;
1646         s->range_table = thisboard->range_ai;
1647         s->do_cmd = das1800_ai_do_cmd;
1648         s->do_cmdtest = das1800_ai_do_cmdtest;
1649         s->insn_read = das1800_ai_rinsn;
1650         s->poll = das1800_ai_poll;
1651         s->cancel = das1800_cancel;
1652
1653         /* analog out */
1654         s = &dev->subdevices[1];
1655         if (thisboard->ao_ability == 1) {
1656                 s->type = COMEDI_SUBD_AO;
1657                 s->subdev_flags = SDF_WRITABLE;
1658                 s->n_chan = thisboard->ao_n_chan;
1659                 s->maxdata = (1 << thisboard->resolution) - 1;
1660                 s->range_table = &range_ao_1;
1661                 s->insn_write = das1800_ao_winsn;
1662         } else {
1663                 s->type = COMEDI_SUBD_UNUSED;
1664         }
1665
1666         /* di */
1667         s = &dev->subdevices[2];
1668         s->type = COMEDI_SUBD_DI;
1669         s->subdev_flags = SDF_READABLE;
1670         s->n_chan = 4;
1671         s->maxdata = 1;
1672         s->range_table = &range_digital;
1673         s->insn_bits = das1800_di_rbits;
1674
1675         /* do */
1676         s = &dev->subdevices[3];
1677         s->type = COMEDI_SUBD_DO;
1678         s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
1679         s->n_chan = thisboard->do_n_chan;
1680         s->maxdata = 1;
1681         s->range_table = &range_digital;
1682         s->insn_bits = das1800_do_wbits;
1683
1684         das1800_cancel(dev, dev->read_subdev);
1685
1686         /*  initialize digital out channels */
1687         outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1688
1689         /*  initialize analog out channels */
1690         if (thisboard->ao_ability == 1) {
1691                 /*  select 'update' dac channel for baseAddress + 0x0 */
1692                 outb(DAC(thisboard->ao_n_chan - 1),
1693                      dev->iobase + DAS1800_SELECT);
1694                 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1695         }
1696
1697         return 0;
1698 };
1699
1700 static void das1800_detach(struct comedi_device *dev)
1701 {
1702         if (dev->iobase)
1703                 release_region(dev->iobase, DAS1800_SIZE);
1704         if (dev->irq)
1705                 free_irq(dev->irq, dev);
1706         if (dev->private) {
1707                 if (devpriv->iobase2)
1708                         release_region(devpriv->iobase2, DAS1800_SIZE);
1709                 if (devpriv->dma0)
1710                         free_dma(devpriv->dma0);
1711                 if (devpriv->dma1)
1712                         free_dma(devpriv->dma1);
1713                 kfree(devpriv->ai_buf0);
1714                 kfree(devpriv->ai_buf1);
1715         }
1716 };
1717
1718 static struct comedi_driver das1800_driver = {
1719         .driver_name    = "das1800",
1720         .module         = THIS_MODULE,
1721         .attach         = das1800_attach,
1722         .detach         = das1800_detach,
1723         .num_names      = ARRAY_SIZE(das1800_boards),
1724         .board_name     = &das1800_boards[0].name,
1725         .offset         = sizeof(struct das1800_board),
1726 };
1727 module_comedi_driver(das1800_driver);
1728
1729 MODULE_AUTHOR("Comedi http://www.comedi.org");
1730 MODULE_DESCRIPTION("Comedi low-level driver");
1731 MODULE_LICENSE("GPL");