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 /* analog out range for boards with basic analog out */
 458 static const struct comedi_lrange range_ao_1 = {
 459         1,
 460         {
 461          RANGE(-10, 10),
 462          }
 463 };
 464
 465 /* analog out range for 'ao' boards */
 466 /*
 467 static const struct comedi_lrange range_ao_2 = {
 468         2,
 469         {
 470                 RANGE(-10, 10),
 471                 RANGE(-5, 5),
 472         }
 473 };
 474 */
 475
 476 static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
 477                                             uint16_t sample)
 478 {
 479         sample += 1 << (thisboard->resolution - 1);
 480         return sample;
 481 }
 482
 483 static void munge_data(struct comedi_device *dev, uint16_t * array,
 484                        unsigned int num_elements)
 485 {
 486         unsigned int i;
 487         int unipolar;
 488
 489         /* see if card is using a unipolar or bipolar range so we can munge data correctly */
 490         unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
 491
 492         /* convert to unsigned type if we are in a bipolar mode */
 493         if (!unipolar) {
 494                 for (i = 0; i < num_elements; i++)
 495                         array[i] = munge_bipolar_sample(dev, array[i]);
 496         }
 497 }
 498
 499 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
 500                                           struct comedi_subdevice *s)
 501 {
 502         struct das1800_private *devpriv = dev->private;
 503         int numPoints = 0;      /* number of points to read */
 504         struct comedi_cmd *cmd = &s->async->cmd;
 505
 506         numPoints = FIFO_SIZE / 2;
 507         /* if we only need some of the points */
 508         if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
 509                 numPoints = devpriv->count;
 510         insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
 511         munge_data(dev, devpriv->ai_buf0, numPoints);
 512         cfc_write_array_to_buffer(s, devpriv->ai_buf0,
 513                                   numPoints * sizeof(devpriv->ai_buf0[0]));
 514         if (cmd->stop_src == TRIG_COUNT)
 515                 devpriv->count -= numPoints;
 516         return;
 517 }
 518
 519 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
 520                                           struct comedi_subdevice *s)
 521 {
 522         struct das1800_private *devpriv = dev->private;
 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         struct das1800_private *devpriv = dev->private;
 552         unsigned int num_bytes, num_samples;
 553         struct comedi_cmd *cmd = &s->async->cmd;
 554
 555         disable_dma(channel);
 556
 557         /* clear flip-flop to make sure 2-byte registers
 558          * get set correctly */
 559         clear_dma_ff(channel);
 560
 561         /*  figure out how many points to read */
 562         num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
 563         num_samples = num_bytes / sizeof(short);
 564
 565         /* if we only need some of the points */
 566         if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
 567                 num_samples = devpriv->count;
 568
 569         munge_data(dev, buffer, num_samples);
 570         cfc_write_array_to_buffer(s, buffer, num_bytes);
 571         if (s->async->cmd.stop_src == TRIG_COUNT)
 572                 devpriv->count -= num_samples;
 573
 574         return;
 575 }
 576
 577 /* flushes remaining data from board when external trigger has stopped acquisition
 578  * and we are using dma transfers */
 579 static void das1800_flush_dma(struct comedi_device *dev,
 580                               struct comedi_subdevice *s)
 581 {
 582         struct das1800_private *devpriv = dev->private;
 583         unsigned long flags;
 584         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
 585
 586         flags = claim_dma_lock();
 587         das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 588                                   devpriv->dma_current_buf);
 589
 590         if (dual_dma) {
 591                 /*  switch to other channel and flush it */
 592                 if (devpriv->dma_current == devpriv->dma0) {
 593                         devpriv->dma_current = devpriv->dma1;
 594                         devpriv->dma_current_buf = devpriv->ai_buf1;
 595                 } else {
 596                         devpriv->dma_current = devpriv->dma0;
 597                         devpriv->dma_current_buf = devpriv->ai_buf0;
 598                 }
 599                 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 600                                           devpriv->dma_current_buf);
 601         }
 602
 603         release_dma_lock(flags);
 604
 605         /*  get any remaining samples in fifo */
 606         das1800_handle_fifo_not_empty(dev, s);
 607
 608         return;
 609 }
 610
 611 static void das1800_handle_dma(struct comedi_device *dev,
 612                                struct comedi_subdevice *s, unsigned int status)
 613 {
 614         struct das1800_private *devpriv = dev->private;
 615         unsigned long flags;
 616         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
 617
 618         flags = claim_dma_lock();
 619         das1800_flush_dma_channel(dev, s, devpriv->dma_current,
 620                                   devpriv->dma_current_buf);
 621         /*  re-enable  dma channel */
 622         set_dma_addr(devpriv->dma_current,
 623                      virt_to_bus(devpriv->dma_current_buf));
 624         set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
 625         enable_dma(devpriv->dma_current);
 626         release_dma_lock(flags);
 627
 628         if (status & DMATC) {
 629                 /*  clear DMATC interrupt bit */
 630                 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
 631                 /*  switch dma channels for next time, if appropriate */
 632                 if (dual_dma) {
 633                         /*  read data from the other channel next time */
 634                         if (devpriv->dma_current == devpriv->dma0) {
 635                                 devpriv->dma_current = devpriv->dma1;
 636                                 devpriv->dma_current_buf = devpriv->ai_buf1;
 637                         } else {
 638                                 devpriv->dma_current = devpriv->dma0;
 639                                 devpriv->dma_current_buf = devpriv->ai_buf0;
 640                         }
 641                 }
 642         }
 643
 644         return;
 645 }
 646
 647 static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
 648 {
 649         struct das1800_private *devpriv = dev->private;
 650
 651         outb(0x0, dev->iobase + DAS1800_STATUS);        /* disable conversions */
 652         outb(0x0, dev->iobase + DAS1800_CONTROL_B);     /* disable interrupts and dma */
 653         outb(0x0, dev->iobase + DAS1800_CONTROL_A);     /* disable and clear fifo and stop triggering */
 654         if (devpriv->dma0)
 655                 disable_dma(devpriv->dma0);
 656         if (devpriv->dma1)
 657                 disable_dma(devpriv->dma1);
 658         return 0;
 659 }
 660
 661 /* the guts of the interrupt handler, that is shared with das1800_ai_poll */
 662 static void das1800_ai_handler(struct comedi_device *dev)
 663 {
 664         struct das1800_private *devpriv = dev->private;
 665         struct comedi_subdevice *s = &dev->subdevices[0];
 666         struct comedi_async *async = s->async;
 667         struct comedi_cmd *cmd = &async->cmd;
 668         unsigned int status = inb(dev->iobase + DAS1800_STATUS);
 669
 670         async->events = 0;
 671         /*  select adc for base address + 0 */
 672         outb(ADC, dev->iobase + DAS1800_SELECT);
 673         /*  dma buffer full */
 674         if (devpriv->irq_dma_bits & DMA_ENABLED) {
 675                 /*  look for data from dma transfer even if dma terminal count hasn't happened yet */
 676                 das1800_handle_dma(dev, s, status);
 677         } else if (status & FHF) {      /*  if fifo half full */
 678                 das1800_handle_fifo_half_full(dev, s);
 679         } else if (status & FNE) {      /*  if fifo not empty */
 680                 das1800_handle_fifo_not_empty(dev, s);
 681         }
 682
 683         async->events |= COMEDI_CB_BLOCK;
 684         /* if the card's fifo has overflowed */
 685         if (status & OVF) {
 686                 /*  clear OVF interrupt bit */
 687                 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
 688                 comedi_error(dev, "DAS1800 FIFO overflow");
 689                 das1800_cancel(dev, s);
 690                 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
 691                 comedi_event(dev, s);
 692                 return;
 693         }
 694         /*  stop taking data if appropriate */
 695         /* stop_src TRIG_EXT */
 696         if (status & CT0TC) {
 697                 /*  clear CT0TC interrupt bit */
 698                 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
 699                 /*  make sure we get all remaining data from board before quitting */
 700                 if (devpriv->irq_dma_bits & DMA_ENABLED)
 701                         das1800_flush_dma(dev, s);
 702                 else
 703                         das1800_handle_fifo_not_empty(dev, s);
 704                 das1800_cancel(dev, s); /* disable hardware conversions */
 705                 async->events |= COMEDI_CB_EOA;
 706         } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) {        /*  stop_src TRIG_COUNT */
 707                 das1800_cancel(dev, s); /* disable hardware conversions */
 708                 async->events |= COMEDI_CB_EOA;
 709         }
 710
 711         comedi_event(dev, s);
 712
 713         return;
 714 }
 715
 716 static int das1800_ai_poll(struct comedi_device *dev,
 717                            struct comedi_subdevice *s)
 718 {
 719         unsigned long flags;
 720
 721         /*  prevent race with interrupt handler */
 722         spin_lock_irqsave(&dev->spinlock, flags);
 723         das1800_ai_handler(dev);
 724         spin_unlock_irqrestore(&dev->spinlock, flags);
 725
 726         return s->async->buf_write_count - s->async->buf_read_count;
 727 }
 728
 729 static irqreturn_t das1800_interrupt(int irq, void *d)
 730 {
 731         struct comedi_device *dev = d;
 732         unsigned int status;
 733
 734         if (dev->attached == 0) {
 735                 comedi_error(dev, "premature interrupt");
 736                 return IRQ_HANDLED;
 737         }
 738
 739         /* Prevent race with das1800_ai_poll() on multi processor systems.
 740          * Also protects indirect addressing in das1800_ai_handler */
 741         spin_lock(&dev->spinlock);
 742         status = inb(dev->iobase + DAS1800_STATUS);
 743
 744         /* if interrupt was not caused by das-1800 */
 745         if (!(status & INT)) {
 746                 spin_unlock(&dev->spinlock);
 747                 return IRQ_NONE;
 748         }
 749         /* clear the interrupt status bit INT */
 750         outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
 751         /*  handle interrupt */
 752         das1800_ai_handler(dev);
 753
 754         spin_unlock(&dev->spinlock);
 755         return IRQ_HANDLED;
 756 }
 757
 758 /* converts requested conversion timing to timing compatible with
 759  * hardware, used only when card is in 'burst mode'
 760  */
 761 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
 762 {
 763         unsigned int micro_sec;
 764
 765         /*  in burst mode, the maximum conversion time is 64 microseconds */
 766         if (convert_arg > 64000)
 767                 convert_arg = 64000;
 768
 769         /*  the conversion time must be an integral number of microseconds */
 770         switch (round_mode) {
 771         case TRIG_ROUND_NEAREST:
 772         default:
 773                 micro_sec = (convert_arg + 500) / 1000;
 774                 break;
 775         case TRIG_ROUND_DOWN:
 776                 micro_sec = convert_arg / 1000;
 777                 break;
 778         case TRIG_ROUND_UP:
 779                 micro_sec = (convert_arg - 1) / 1000 + 1;
 780                 break;
 781         }
 782
 783         /*  return number of nanoseconds */
 784         return micro_sec * 1000;
 785 }
 786
 787 /* test analog input cmd */
 788 static int das1800_ai_do_cmdtest(struct comedi_device *dev,
 789                                  struct comedi_subdevice *s,
 790                                  struct comedi_cmd *cmd)
 791 {
 792         struct das1800_private *devpriv = dev->private;
 793         int err = 0;
 794         unsigned int tmp_arg;
 795         int i;
 796         int unipolar;
 797
 798         /* Step 1 : check if triggers are trivially valid */
 799
 800         err |= cfc_check_trigger_src(&cmd->start_src, TRIG_NOW | TRIG_EXT);
 801         err |= cfc_check_trigger_src(&cmd->scan_begin_src,
 802                                         TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT);
 803         err |= cfc_check_trigger_src(&cmd->convert_src, TRIG_TIMER | TRIG_EXT);
 804         err |= cfc_check_trigger_src(&cmd->scan_end_src, TRIG_COUNT);
 805         err |= cfc_check_trigger_src(&cmd->stop_src,
 806                                         TRIG_COUNT | TRIG_EXT | TRIG_NONE);
 807
 808         if (err)
 809                 return 1;
 810
 811         /* Step 2a : make sure trigger sources are unique */
 812
 813         err |= cfc_check_trigger_is_unique(cmd->start_src);
 814         err |= cfc_check_trigger_is_unique(cmd->scan_begin_src);
 815         err |= cfc_check_trigger_is_unique(cmd->convert_src);
 816         err |= cfc_check_trigger_is_unique(cmd->stop_src);
 817
 818         /* Step 2b : and mutually compatible */
 819
 820         if (cmd->scan_begin_src != TRIG_FOLLOW &&
 821             cmd->convert_src != TRIG_TIMER)
 822                 err |= -EINVAL;
 823
 824         if (err)
 825                 return 2;
 826
 827         /* Step 3: check if arguments are trivially valid */
 828
 829         err |= cfc_check_trigger_arg_is(&cmd->start_arg, 0);
 830
 831         if (cmd->convert_src == TRIG_TIMER)
 832                 err |= cfc_check_trigger_arg_min(&cmd->convert_arg,
 833                                                  thisboard->ai_speed);
 834
 835         err |= cfc_check_trigger_arg_min(&cmd->chanlist_len, 1);
 836         err |= cfc_check_trigger_arg_is(&cmd->scan_end_arg, cmd->chanlist_len);
 837
 838         switch (cmd->stop_src) {
 839         case TRIG_COUNT:
 840                 err |= cfc_check_trigger_arg_min(&cmd->stop_arg, 1);
 841                 break;
 842         case TRIG_NONE:
 843                 err |= cfc_check_trigger_arg_is(&cmd->stop_arg, 0);
 844                 break;
 845         default:
 846                 break;
 847         }
 848
 849         if (err)
 850                 return 3;
 851
 852         /* step 4: fix up any arguments */
 853
 854         if (cmd->convert_src == TRIG_TIMER) {
 855                 /*  if we are not in burst mode */
 856                 if (cmd->scan_begin_src == TRIG_FOLLOW) {
 857                         tmp_arg = cmd->convert_arg;
 858                         /* calculate counter values that give desired timing */
 859                         i8253_cascade_ns_to_timer_2div(TIMER_BASE,
 860                                                        &(devpriv->divisor1),
 861                                                        &(devpriv->divisor2),
 862                                                        &(cmd->convert_arg),
 863                                                        cmd->
 864                                                        flags & TRIG_ROUND_MASK);
 865                         if (tmp_arg != cmd->convert_arg)
 866                                 err++;
 867                 }
 868                 /*  if we are in burst mode */
 869                 else {
 870                         /*  check that convert_arg is compatible */
 871                         tmp_arg = cmd->convert_arg;
 872                         cmd->convert_arg =
 873                             burst_convert_arg(cmd->convert_arg,
 874                                               cmd->flags & TRIG_ROUND_MASK);
 875                         if (tmp_arg != cmd->convert_arg)
 876                                 err++;
 877
 878                         if (cmd->scan_begin_src == TRIG_TIMER) {
 879                                 /*  if scans are timed faster than conversion rate allows */
 880                                 if (cmd->convert_arg * cmd->chanlist_len >
 881                                     cmd->scan_begin_arg) {
 882                                         cmd->scan_begin_arg =
 883                                             cmd->convert_arg *
 884                                             cmd->chanlist_len;
 885                                         err++;
 886                                 }
 887                                 tmp_arg = cmd->scan_begin_arg;
 888                                 /* calculate counter values that give desired timing */
 889                                 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
 890                                                                &(devpriv->
 891                                                                  divisor1),
 892                                                                &(devpriv->
 893                                                                  divisor2),
 894                                                                &(cmd->
 895                                                                  scan_begin_arg),
 896                                                                cmd->
 897                                                                flags &
 898                                                                TRIG_ROUND_MASK);
 899                                 if (tmp_arg != cmd->scan_begin_arg)
 900                                         err++;
 901                         }
 902                 }
 903         }
 904
 905         if (err)
 906                 return 4;
 907
 908         /*  make sure user is not trying to mix unipolar and bipolar ranges */
 909         if (cmd->chanlist) {
 910                 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
 911                 for (i = 1; i < cmd->chanlist_len; i++) {
 912                         if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
 913                                 comedi_error(dev,
 914                                              "unipolar and bipolar ranges cannot be mixed in the chanlist");
 915                                 err++;
 916                                 break;
 917                         }
 918                 }
 919         }
 920
 921         if (err)
 922                 return 5;
 923
 924         return 0;
 925 }
 926
 927 /* returns appropriate bits for control register a, depending on command */
 928 static int control_a_bits(const struct comedi_cmd *cmd)
 929 {
 930         int control_a;
 931
 932         control_a = FFEN;       /* enable fifo */
 933         if (cmd->stop_src == TRIG_EXT)
 934                 control_a |= ATEN;
 935         switch (cmd->start_src) {
 936         case TRIG_EXT:
 937                 control_a |= TGEN | CGSL;
 938                 break;
 939         case TRIG_NOW:
 940                 control_a |= CGEN;
 941                 break;
 942         default:
 943                 break;
 944         }
 945
 946         return control_a;
 947 }
 948
 949 /* returns appropriate bits for control register c, depending on command */
 950 static int control_c_bits(const struct comedi_cmd *cmd)
 951 {
 952         int control_c;
 953         int aref;
 954
 955         /* set clock source to internal or external, select analog reference,
 956          * select unipolar / bipolar
 957          */
 958         aref = CR_AREF(cmd->chanlist[0]);
 959         control_c = UQEN;       /* enable upper qram addresses */
 960         if (aref != AREF_DIFF)
 961                 control_c |= SD;
 962         if (aref == AREF_COMMON)
 963                 control_c |= CMEN;
 964         /* if a unipolar range was selected */
 965         if (CR_RANGE(cmd->chanlist[0]) & UNIPOLAR)
 966                 control_c |= UB;
 967         switch (cmd->scan_begin_src) {
 968         case TRIG_FOLLOW:       /*  not in burst mode */
 969                 switch (cmd->convert_src) {
 970                 case TRIG_TIMER:
 971                         /* trig on cascaded counters */
 972                         control_c |= IPCLK;
 973                         break;
 974                 case TRIG_EXT:
 975                         /* trig on falling edge of external trigger */
 976                         control_c |= XPCLK;
 977                         break;
 978                 default:
 979                         break;
 980                 }
 981                 break;
 982         case TRIG_TIMER:
 983                 /*  burst mode with internal pacer clock */
 984                 control_c |= BMDE | IPCLK;
 985                 break;
 986         case TRIG_EXT:
 987                 /*  burst mode with external trigger */
 988                 control_c |= BMDE | XPCLK;
 989                 break;
 990         default:
 991                 break;
 992         }
 993
 994         return control_c;
 995 }
 996
 997 /* loads counters with divisor1, divisor2 from private structure */
 998 static int das1800_set_frequency(struct comedi_device *dev)
 999 {
1000         struct das1800_private *devpriv = dev->private;
1001         int err = 0;
1002
1003         /*  counter 1, mode 2 */
1004         if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
1005                        2))
1006                 err++;
1007         /*  counter 2, mode 2 */
1008         if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
1009                        2))
1010                 err++;
1011         if (err)
1012                 return -1;
1013
1014         return 0;
1015 }
1016
1017 /* sets up counters */
1018 static int setup_counters(struct comedi_device *dev,
1019                           const struct comedi_cmd *cmd)
1020 {
1021         struct das1800_private *devpriv = dev->private;
1022         unsigned int period;
1023
1024         /*  setup cascaded counters for conversion/scan frequency */
1025         switch (cmd->scan_begin_src) {
1026         case TRIG_FOLLOW:       /*  not in burst mode */
1027                 if (cmd->convert_src == TRIG_TIMER) {
1028                         /* set conversion frequency */
1029                         period = cmd->convert_arg;
1030                         i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1031                                                        &devpriv->divisor1,
1032                                                        &devpriv->divisor2,
1033                                                        &period,
1034                                                        cmd->flags &
1035                                                         TRIG_ROUND_MASK);
1036                         if (das1800_set_frequency(dev) < 0)
1037                                 return -1;
1038                 }
1039                 break;
1040         case TRIG_TIMER:        /*  in burst mode */
1041                 /* set scan frequency */
1042                 period = cmd->scan_begin_arg;
1043                 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &devpriv->divisor1,
1044                                                &devpriv->divisor2, &period,
1045                                                cmd->flags & TRIG_ROUND_MASK);
1046                 if (das1800_set_frequency(dev) < 0)
1047                         return -1;
1048                 break;
1049         default:
1050                 break;
1051         }
1052
1053         /*  setup counter 0 for 'about triggering' */
1054         if (cmd->stop_src == TRIG_EXT) {
1055                 /*  load counter 0 in mode 0 */
1056                 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1057         }
1058
1059         return 0;
1060 }
1061
1062 /* utility function that suggests a dma transfer size based on the conversion period 'ns' */
1063 static unsigned int suggest_transfer_size(const struct comedi_cmd *cmd)
1064 {
1065         unsigned int size = DMA_BUF_SIZE;
1066         static const int sample_size = 2;       /*  size in bytes of one sample from board */
1067         unsigned int fill_time = 300000000;     /*  target time in nanoseconds for filling dma buffer */
1068         unsigned int max_size;  /*  maximum size we will allow for a transfer */
1069
1070         /*  make dma buffer fill in 0.3 seconds for timed modes */
1071         switch (cmd->scan_begin_src) {
1072         case TRIG_FOLLOW:       /*  not in burst mode */
1073                 if (cmd->convert_src == TRIG_TIMER)
1074                         size = (fill_time / cmd->convert_arg) * sample_size;
1075                 break;
1076         case TRIG_TIMER:
1077                 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
1078                     sample_size;
1079                 break;
1080         default:
1081                 size = DMA_BUF_SIZE;
1082                 break;
1083         }
1084
1085         /*  set a minimum and maximum size allowed */
1086         max_size = DMA_BUF_SIZE;
1087         /*  if we are taking limited number of conversions, limit transfer size to that */
1088         if (cmd->stop_src == TRIG_COUNT &&
1089             cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
1090                 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1091
1092         if (size > max_size)
1093                 size = max_size;
1094         if (size < sample_size)
1095                 size = sample_size;
1096
1097         return size;
1098 }
1099
1100 /* sets up dma */
1101 static void setup_dma(struct comedi_device *dev, const struct comedi_cmd *cmd)
1102 {
1103         struct das1800_private *devpriv = dev->private;
1104         unsigned long lock_flags;
1105         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1106
1107         if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1108                 return;
1109
1110         /* determine a reasonable dma transfer size */
1111         devpriv->dma_transfer_size = suggest_transfer_size(cmd);
1112         lock_flags = claim_dma_lock();
1113         disable_dma(devpriv->dma0);
1114         /* clear flip-flop to make sure 2-byte registers for
1115          * count and address get set correctly */
1116         clear_dma_ff(devpriv->dma0);
1117         set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
1118         /*  set appropriate size of transfer */
1119         set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1120         devpriv->dma_current = devpriv->dma0;
1121         devpriv->dma_current_buf = devpriv->ai_buf0;
1122         enable_dma(devpriv->dma0);
1123         /*  set up dual dma if appropriate */
1124         if (dual_dma) {
1125                 disable_dma(devpriv->dma1);
1126                 /* clear flip-flop to make sure 2-byte registers for
1127                  * count and address get set correctly */
1128                 clear_dma_ff(devpriv->dma1);
1129                 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
1130                 /*  set appropriate size of transfer */
1131                 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1132                 enable_dma(devpriv->dma1);
1133         }
1134         release_dma_lock(lock_flags);
1135
1136         return;
1137 }
1138
1139 /* programs channel/gain list into card */
1140 static void program_chanlist(struct comedi_device *dev,
1141                              const struct comedi_cmd *cmd)
1142 {
1143         int i, n, chan_range;
1144         unsigned long irq_flags;
1145         const int range_mask = 0x3;     /* masks unipolar/bipolar bit off range */
1146         const int range_bitshift = 8;
1147
1148         n = cmd->chanlist_len;
1149         /*  spinlock protects indirect addressing */
1150         spin_lock_irqsave(&dev->spinlock, irq_flags);
1151         outb(QRAM, dev->iobase + DAS1800_SELECT);       /* select QRAM for baseAddress + 0x0 */
1152         outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);        /*set QRAM address start */
1153         /* make channel / gain list */
1154         for (i = 0; i < n; i++) {
1155                 chan_range =
1156                     CR_CHAN(cmd->chanlist[i]) |
1157                     ((CR_RANGE(cmd->chanlist[i]) & range_mask) <<
1158                      range_bitshift);
1159                 outw(chan_range, dev->iobase + DAS1800_QRAM);
1160         }
1161         outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);        /*finish write to QRAM */
1162         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1163
1164         return;
1165 }
1166
1167 /* analog input do_cmd */
1168 static int das1800_ai_do_cmd(struct comedi_device *dev,
1169                              struct comedi_subdevice *s)
1170 {
1171         struct das1800_private *devpriv = dev->private;
1172         int ret;
1173         int control_a, control_c;
1174         struct comedi_async *async = s->async;
1175         const struct comedi_cmd *cmd = &async->cmd;
1176
1177         if (!dev->irq) {
1178                 comedi_error(dev,
1179                              "no irq assigned for das-1800, cannot do hardware conversions");
1180                 return -1;
1181         }
1182
1183         /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1184          * (because dma in handler is unsafe at hard real-time priority) */
1185         if (cmd->flags & (TRIG_WAKE_EOS | TRIG_RT))
1186                 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1187         else
1188                 devpriv->irq_dma_bits |= devpriv->dma_bits;
1189         /*  interrupt on end of conversion for TRIG_WAKE_EOS */
1190         if (cmd->flags & TRIG_WAKE_EOS) {
1191                 /*  interrupt fifo not empty */
1192                 devpriv->irq_dma_bits &= ~FIMD;
1193         } else {
1194                 /*  interrupt fifo half full */
1195                 devpriv->irq_dma_bits |= FIMD;
1196         }
1197         /*  determine how many conversions we need */
1198         if (cmd->stop_src == TRIG_COUNT)
1199                 devpriv->count = cmd->stop_arg * cmd->chanlist_len;
1200
1201         das1800_cancel(dev, s);
1202
1203         /*  determine proper bits for control registers */
1204         control_a = control_a_bits(cmd);
1205         control_c = control_c_bits(cmd);
1206
1207         /* setup card and start */
1208         program_chanlist(dev, cmd);
1209         ret = setup_counters(dev, cmd);
1210         if (ret < 0) {
1211                 comedi_error(dev, "Error setting up counters");
1212                 return ret;
1213         }
1214         setup_dma(dev, cmd);
1215         outb(control_c, dev->iobase + DAS1800_CONTROL_C);
1216         /*  set conversion rate and length for burst mode */
1217         if (control_c & BMDE) {
1218                 /*  program conversion period with number of microseconds minus 1 */
1219                 outb(cmd->convert_arg / 1000 - 1,
1220                      dev->iobase + DAS1800_BURST_RATE);
1221                 outb(cmd->chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1222         }
1223         outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B);   /*  enable irq/dma */
1224         outb(control_a, dev->iobase + DAS1800_CONTROL_A);       /* enable fifo and triggering */
1225         outb(CVEN, dev->iobase + DAS1800_STATUS);       /* enable conversions */
1226
1227         return 0;
1228 }
1229
1230 /* read analog input */
1231 static int das1800_ai_rinsn(struct comedi_device *dev,
1232                             struct comedi_subdevice *s,
1233                             struct comedi_insn *insn, unsigned int *data)
1234 {
1235         int i, n;
1236         int chan, range, aref, chan_range;
1237         int timeout = 1000;
1238         short dpnt;
1239         int conv_flags = 0;
1240         unsigned long irq_flags;
1241
1242         /* set up analog reference and unipolar / bipolar mode */
1243         aref = CR_AREF(insn->chanspec);
1244         conv_flags |= UQEN;
1245         if (aref != AREF_DIFF)
1246                 conv_flags |= SD;
1247         if (aref == AREF_COMMON)
1248                 conv_flags |= CMEN;
1249         /* if a unipolar range was selected */
1250         if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1251                 conv_flags |= UB;
1252
1253         outb(conv_flags, dev->iobase + DAS1800_CONTROL_C);      /* software conversion enabled */
1254         outb(CVEN, dev->iobase + DAS1800_STATUS);       /* enable conversions */
1255         outb(0x0, dev->iobase + DAS1800_CONTROL_A);     /* reset fifo */
1256         outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1257
1258         chan = CR_CHAN(insn->chanspec);
1259         /* mask of unipolar/bipolar bit from range */
1260         range = CR_RANGE(insn->chanspec) & 0x3;
1261         chan_range = chan | (range << 8);
1262         spin_lock_irqsave(&dev->spinlock, irq_flags);
1263         outb(QRAM, dev->iobase + DAS1800_SELECT);       /* select QRAM for baseAddress + 0x0 */
1264         outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);  /* set QRAM address start */
1265         outw(chan_range, dev->iobase + DAS1800_QRAM);
1266         outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);  /*finish write to QRAM */
1267         outb(ADC, dev->iobase + DAS1800_SELECT);        /* select ADC for baseAddress + 0x0 */
1268
1269         for (n = 0; n < insn->n; n++) {
1270                 /* trigger conversion */
1271                 outb(0, dev->iobase + DAS1800_FIFO);
1272                 for (i = 0; i < timeout; i++) {
1273                         if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1274                                 break;
1275                 }
1276                 if (i == timeout) {
1277                         comedi_error(dev, "timeout");
1278                         n = -ETIME;
1279                         goto exit;
1280                 }
1281                 dpnt = inw(dev->iobase + DAS1800_FIFO);
1282                 /* shift data to offset binary for bipolar ranges */
1283                 if ((conv_flags & UB) == 0)
1284                         dpnt += 1 << (thisboard->resolution - 1);
1285                 data[n] = dpnt;
1286         }
1287 exit:
1288         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1289
1290         return n;
1291 }
1292
1293 /* writes to an analog output channel */
1294 static int das1800_ao_winsn(struct comedi_device *dev,
1295                             struct comedi_subdevice *s,
1296                             struct comedi_insn *insn, unsigned int *data)
1297 {
1298         struct das1800_private *devpriv = dev->private;
1299         int chan = CR_CHAN(insn->chanspec);
1300 /* int range = CR_RANGE(insn->chanspec); */
1301         int update_chan = thisboard->ao_n_chan - 1;
1302         short output;
1303         unsigned long irq_flags;
1304
1305         /*   card expects two's complement data */
1306         output = data[0] - (1 << (thisboard->resolution - 1));
1307         /*  if the write is to the 'update' channel, we need to remember its value */
1308         if (chan == update_chan)
1309                 devpriv->ao_update_bits = output;
1310         /*  write to channel */
1311         spin_lock_irqsave(&dev->spinlock, irq_flags);
1312         outb(DAC(chan), dev->iobase + DAS1800_SELECT);  /* select dac channel for baseAddress + 0x0 */
1313         outw(output, dev->iobase + DAS1800_DAC);
1314         /*  now we need to write to 'update' channel to update all dac channels */
1315         if (chan != update_chan) {
1316                 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT);   /* select 'update' channel for baseAddress + 0x0 */
1317                 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1318         }
1319         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1320
1321         return 1;
1322 }
1323
1324 /* reads from digital input channels */
1325 static int das1800_di_rbits(struct comedi_device *dev,
1326                             struct comedi_subdevice *s,
1327                             struct comedi_insn *insn, unsigned int *data)
1328 {
1329
1330         data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1331         data[0] = 0;
1332
1333         return insn->n;
1334 }
1335
1336 /* writes to digital output channels */
1337 static int das1800_do_wbits(struct comedi_device *dev,
1338                             struct comedi_subdevice *s,
1339                             struct comedi_insn *insn, unsigned int *data)
1340 {
1341         struct das1800_private *devpriv = dev->private;
1342         unsigned int wbits;
1343
1344         /*  only set bits that have been masked */
1345         data[0] &= (1 << s->n_chan) - 1;
1346         wbits = devpriv->do_bits;
1347         wbits &= ~data[0];
1348         wbits |= data[0] & data[1];
1349         devpriv->do_bits = wbits;
1350
1351         outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1352
1353         data[1] = devpriv->do_bits;
1354
1355         return insn->n;
1356 }
1357
1358 static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
1359                             unsigned int dma1)
1360 {
1361         struct das1800_private *devpriv = dev->private;
1362         unsigned long flags;
1363
1364         /*  need an irq to do dma */
1365         if (dev->irq && dma0) {
1366                 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
1367                 switch ((dma0 & 0x7) | (dma1 << 4)) {
1368                 case 0x5:       /*  dma0 == 5 */
1369                         devpriv->dma_bits |= DMA_CH5;
1370                         break;
1371                 case 0x6:       /*  dma0 == 6 */
1372                         devpriv->dma_bits |= DMA_CH6;
1373                         break;
1374                 case 0x7:       /*  dma0 == 7 */
1375                         devpriv->dma_bits |= DMA_CH7;
1376                         break;
1377                 case 0x65:      /*  dma0 == 5, dma1 == 6 */
1378                         devpriv->dma_bits |= DMA_CH5_CH6;
1379                         break;
1380                 case 0x76:      /*  dma0 == 6, dma1 == 7 */
1381                         devpriv->dma_bits |= DMA_CH6_CH7;
1382                         break;
1383                 case 0x57:      /*  dma0 == 7, dma1 == 5 */
1384                         devpriv->dma_bits |= DMA_CH7_CH5;
1385                         break;
1386                 default:
1387                         dev_err(dev->class_dev,
1388                                 "only supports dma channels 5 through 7\n");
1389                         dev_err(dev->class_dev,
1390                                 "Dual dma only allows the following combinations:\n");
1391                         dev_err(dev->class_dev,
1392                                 "dma 5,6 / 6,7 / or 7,5\n");
1393                         return -EINVAL;
1394                         break;
1395                 }
1396                 if (request_dma(dma0, dev->driver->driver_name)) {
1397                         dev_err(dev->class_dev,
1398                                 "failed to allocate dma channel %i\n", dma0);
1399                         return -EINVAL;
1400                 }
1401                 devpriv->dma0 = dma0;
1402                 devpriv->dma_current = dma0;
1403                 if (dma1) {
1404                         if (request_dma(dma1, dev->driver->driver_name)) {
1405                                 dev_err(dev->class_dev,
1406                                         "failed to allocate dma channel %i\n",
1407                                         dma1);
1408                                 return -EINVAL;
1409                         }
1410                         devpriv->dma1 = dma1;
1411                 }
1412                 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1413                 if (devpriv->ai_buf0 == NULL)
1414                         return -ENOMEM;
1415                 devpriv->dma_current_buf = devpriv->ai_buf0;
1416                 if (dma1) {
1417                         devpriv->ai_buf1 =
1418                             kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
1419                         if (devpriv->ai_buf1 == NULL)
1420                                 return -ENOMEM;
1421                 }
1422                 flags = claim_dma_lock();
1423                 disable_dma(devpriv->dma0);
1424                 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
1425                 if (dma1) {
1426                         disable_dma(devpriv->dma1);
1427                         set_dma_mode(devpriv->dma1, DMA_MODE_READ);
1428                 }
1429                 release_dma_lock(flags);
1430         }
1431         return 0;
1432 }
1433
1434 static int das1800_probe(struct comedi_device *dev)
1435 {
1436         int id;
1437         int board;
1438
1439         id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf;   /* get id bits */
1440         board = ((struct das1800_board *)dev->board_ptr) - das1800_boards;
1441
1442         switch (id) {
1443         case 0x3:
1444                 if (board == das1801st_da || board == das1802st_da ||
1445                     board == das1701st_da || board == das1702st_da) {
1446                         dev_dbg(dev->class_dev, "Board model: %s\n",
1447                                 das1800_boards[board].name);
1448                         return board;
1449                 }
1450                 printk
1451                     (" Board model (probed, not recommended): das-1800st-da series\n");
1452                 return das1801st;
1453                 break;
1454         case 0x4:
1455                 if (board == das1802hr_da || board == das1702hr_da) {
1456                         dev_dbg(dev->class_dev, "Board model: %s\n",
1457                                 das1800_boards[board].name);
1458                         return board;
1459                 }
1460                 printk
1461                     (" Board model (probed, not recommended): das-1802hr-da\n");
1462                 return das1802hr;
1463                 break;
1464         case 0x5:
1465                 if (board == das1801ao || board == das1802ao ||
1466                     board == das1701ao || board == das1702ao) {
1467                         dev_dbg(dev->class_dev, "Board model: %s\n",
1468                                 das1800_boards[board].name);
1469                         return board;
1470                 }
1471                 printk
1472                     (" Board model (probed, not recommended): das-1800ao series\n");
1473                 return das1801ao;
1474                 break;
1475         case 0x6:
1476                 if (board == das1802hr || board == das1702hr) {
1477                         dev_dbg(dev->class_dev, "Board model: %s\n",
1478                                 das1800_boards[board].name);
1479                         return board;
1480                 }
1481                 printk
1482                     (" Board model (probed, not recommended): das-1802hr\n");
1483                 return das1802hr;
1484                 break;
1485         case 0x7:
1486                 if (board == das1801st || board == das1802st ||
1487                     board == das1701st || board == das1702st) {
1488                         dev_dbg(dev->class_dev, "Board model: %s\n",
1489                                 das1800_boards[board].name);
1490                         return board;
1491                 }
1492                 printk
1493                     (" Board model (probed, not recommended): das-1800st series\n");
1494                 return das1801st;
1495                 break;
1496         case 0x8:
1497                 if (board == das1801hc || board == das1802hc) {
1498                         dev_dbg(dev->class_dev, "Board model: %s\n",
1499                                 das1800_boards[board].name);
1500                         return board;
1501                 }
1502                 printk
1503                     (" Board model (probed, not recommended): das-1800hc series\n");
1504                 return das1801hc;
1505                 break;
1506         default:
1507                 printk
1508                     (" Board model: probe returned 0x%x (unknown, please report)\n",
1509                      id);
1510                 return board;
1511                 break;
1512         }
1513         return -1;
1514 }
1515
1516 static int das1800_attach(struct comedi_device *dev,
1517                           struct comedi_devconfig *it)
1518 {
1519         struct das1800_private *devpriv;
1520         struct comedi_subdevice *s;
1521         unsigned long iobase = it->options[0];
1522         unsigned int irq = it->options[1];
1523         unsigned int dma0 = it->options[2];
1524         unsigned int dma1 = it->options[3];
1525         unsigned long iobase2;
1526         int board;
1527         int retval;
1528
1529         devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
1530         if (!devpriv)
1531                 return -ENOMEM;
1532         dev->private = devpriv;
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         struct das1800_private *devpriv = dev->private;
1703
1704         if (dev->iobase)
1705                 release_region(dev->iobase, DAS1800_SIZE);
1706         if (dev->irq)
1707                 free_irq(dev->irq, dev);
1708         if (devpriv) {
1709                 if (devpriv->iobase2)
1710                         release_region(devpriv->iobase2, DAS1800_SIZE);
1711                 if (devpriv->dma0)
1712                         free_dma(devpriv->dma0);
1713                 if (devpriv->dma1)
1714                         free_dma(devpriv->dma1);
1715                 kfree(devpriv->ai_buf0);
1716                 kfree(devpriv->ai_buf1);
1717         }
1718 };
1719
1720 static struct comedi_driver das1800_driver = {
1721         .driver_name    = "das1800",
1722         .module         = THIS_MODULE,
1723         .attach         = das1800_attach,
1724         .detach         = das1800_detach,
1725         .num_names      = ARRAY_SIZE(das1800_boards),
1726         .board_name     = &das1800_boards[0].name,
1727         .offset         = sizeof(struct das1800_board),
1728 };
1729 module_comedi_driver(das1800_driver);
1730
1731 MODULE_AUTHOR("Comedi http://www.comedi.org");
1732 MODULE_DESCRIPTION("Comedi low-level driver");
1733 MODULE_LICENSE("GPL");