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 "../comedidev.h"
 106
 107 #include <linux/ioport.h>
 108 #include <asm/dma.h>
 109
 110 #include "8253.h"
 111 #include "comedi_fc.h"
 112
 113 /* misc. defines */
 114 #define DAS1800_SIZE           16       /* uses 16 io addresses */
 115 #define FIFO_SIZE              1024     /*  1024 sample fifo */
 116 #define TIMER_BASE             200      /*  5 Mhz master clock */
 117 #define UNIPOLAR               0x4      /*  bit that determines whether input range is uni/bipolar */
 118 #define DMA_BUF_SIZE           0x1ff00  /*  size in bytes of dma buffers */
 119
 120 /* Registers for the das1800 */
 121 #define DAS1800_FIFO            0x0
 122 #define DAS1800_QRAM            0x0
 123 #define DAS1800_DAC             0x0
 124 #define DAS1800_SELECT          0x2
 125 #define   ADC                     0x0
 126 #define   QRAM                    0x1
 127 #define   DAC(a)                  (0x2 + a)
 128 #define DAS1800_DIGITAL         0x3
 129 #define DAS1800_CONTROL_A       0x4
 130 #define   FFEN                    0x1
 131 #define   CGEN                    0x4
 132 #define   CGSL                    0x8
 133 #define   TGEN                    0x10
 134 #define   TGSL                    0x20
 135 #define   ATEN                    0x80
 136 #define DAS1800_CONTROL_B       0x5
 137 #define   DMA_CH5                 0x1
 138 #define   DMA_CH6                 0x2
 139 #define   DMA_CH7                 0x3
 140 #define   DMA_CH5_CH6             0x5
 141 #define   DMA_CH6_CH7             0x6
 142 #define   DMA_CH7_CH5             0x7
 143 #define   DMA_ENABLED             0x3   /* mask used to determine if dma is enabled */
 144 #define   DMA_DUAL                0x4
 145 #define   IRQ3                    0x8
 146 #define   IRQ5                    0x10
 147 #define   IRQ7                    0x18
 148 #define   IRQ10                   0x28
 149 #define   IRQ11                   0x30
 150 #define   IRQ15                   0x38
 151 #define   FIMD                    0x40
 152 #define DAS1800_CONTROL_C       0X6
 153 #define   IPCLK                   0x1
 154 #define   XPCLK                   0x3
 155 #define   BMDE                    0x4
 156 #define   CMEN                    0x8
 157 #define   UQEN                    0x10
 158 #define   SD                      0x40
 159 #define   UB                      0x80
 160 #define DAS1800_STATUS          0x7
 161 /* bits that prevent interrupt status bits (and CVEN) from being cleared on write */
 162 #define   CLEAR_INTR_MASK         (CVEN_MASK | 0x1f)
 163 #define   INT                     0x1
 164 #define   DMATC                   0x2
 165 #define   CT0TC                   0x8
 166 #define   OVF                     0x10
 167 #define   FHF                     0x20
 168 #define   FNE                     0x40
 169 #define   CVEN_MASK               0x40  /*  masks CVEN on write */
 170 #define   CVEN                    0x80
 171 #define DAS1800_BURST_LENGTH    0x8
 172 #define DAS1800_BURST_RATE      0x9
 173 #define DAS1800_QRAM_ADDRESS    0xa
 174 #define DAS1800_COUNTER         0xc
 175
 176 #define IOBASE2                   0x400 /* offset of additional ioports used on 'ao' cards */
 177
 178 enum {
 179         das1701st, das1701st_da, das1702st, das1702st_da, das1702hr,
 180         das1702hr_da,
 181         das1701ao, das1702ao, das1801st, das1801st_da, das1802st, das1802st_da,
 182         das1802hr, das1802hr_da, das1801hc, das1802hc, das1801ao, das1802ao
 183 };
 184
 185 static int das1800_attach(struct comedi_device *dev,
 186                           struct comedi_devconfig *it);
 187 static int das1800_detach(struct comedi_device *dev);
 188 static int das1800_probe(struct comedi_device *dev);
 189 static int das1800_cancel(struct comedi_device *dev,
 190                           struct comedi_subdevice *s);
 191 static irqreturn_t das1800_interrupt(int irq, void *d);
 192 static int das1800_ai_poll(struct comedi_device *dev,
 193                            struct comedi_subdevice *s);
 194 static void das1800_ai_handler(struct comedi_device *dev);
 195 static void das1800_handle_dma(struct comedi_device *dev,
 196                                struct comedi_subdevice *s, unsigned int status);
 197 static void das1800_flush_dma(struct comedi_device *dev,
 198                               struct comedi_subdevice *s);
 199 static void das1800_flush_dma_channel(struct comedi_device *dev,
 200                                       struct comedi_subdevice *s,
 201                                       unsigned int channel, uint16_t * buffer);
 202 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
 203                                           struct comedi_subdevice *s);
 204 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
 205                                           struct comedi_subdevice *s);
 206 static int das1800_ai_do_cmdtest(struct comedi_device *dev,
 207                                  struct comedi_subdevice *s,
 208                                  struct comedi_cmd *cmd);
 209 static int das1800_ai_do_cmd(struct comedi_device *dev,
 210                              struct comedi_subdevice *s);
 211 static int das1800_ai_rinsn(struct comedi_device *dev,
 212                             struct comedi_subdevice *s,
 213                             struct comedi_insn *insn, unsigned int *data);
 214 static int das1800_ao_winsn(struct comedi_device *dev,
 215                             struct comedi_subdevice *s,
 216                             struct comedi_insn *insn, unsigned int *data);
 217 static int das1800_di_rbits(struct comedi_device *dev,
 218                             struct comedi_subdevice *s,
 219                             struct comedi_insn *insn, unsigned int *data);
 220 static int das1800_do_wbits(struct comedi_device *dev,
 221                             struct comedi_subdevice *s,
 222                             struct comedi_insn *insn, unsigned int *data);
 223
 224 static int das1800_set_frequency(struct comedi_device *dev);
 225 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode);
 226 static unsigned int suggest_transfer_size(struct comedi_cmd *cmd);
 227
 228 /* analog input ranges */
 229 static const struct comedi_lrange range_ai_das1801 = {
 230         8,
 231         {
 232          RANGE(-5, 5),
 233          RANGE(-1, 1),
 234          RANGE(-0.1, 0.1),
 235          RANGE(-0.02, 0.02),
 236          RANGE(0, 5),
 237          RANGE(0, 1),
 238          RANGE(0, 0.1),
 239          RANGE(0, 0.02),
 240          }
 241 };
 242
 243 static const struct comedi_lrange range_ai_das1802 = {
 244         8,
 245         {
 246          RANGE(-10, 10),
 247          RANGE(-5, 5),
 248          RANGE(-2.5, 2.5),
 249          RANGE(-1.25, 1.25),
 250          RANGE(0, 10),
 251          RANGE(0, 5),
 252          RANGE(0, 2.5),
 253          RANGE(0, 1.25),
 254          }
 255 };
 256
 257 struct das1800_board {
 258         const char *name;
 259         int ai_speed;           /* max conversion period in nanoseconds */
 260         int resolution;         /* bits of ai resolution */
 261         int qram_len;           /* length of card's channel / gain queue */
 262         int common;             /* supports AREF_COMMON flag */
 263         int do_n_chan;          /* number of digital output channels */
 264         int ao_ability;         /* 0 == no analog out, 1 == basic analog out, 2 == waveform analog out */
 265         int ao_n_chan;          /* number of analog out channels */
 266         const struct comedi_lrange *range_ai;   /* available input ranges */
 267 };
 268
 269 /* Warning: the maximum conversion speeds listed below are
 270  * not always achievable depending on board setup (see
 271  * user manual.)
 272  */
 273 static const struct das1800_board das1800_boards[] = {
 274         {
 275          .name = "das-1701st",
 276          .ai_speed = 6250,
 277          .resolution = 12,
 278          .qram_len = 256,
 279          .common = 1,
 280          .do_n_chan = 4,
 281          .ao_ability = 0,
 282          .ao_n_chan = 0,
 283          .range_ai = &range_ai_das1801,
 284          },
 285         {
 286          .name = "das-1701st-da",
 287          .ai_speed = 6250,
 288          .resolution = 12,
 289          .qram_len = 256,
 290          .common = 1,
 291          .do_n_chan = 4,
 292          .ao_ability = 1,
 293          .ao_n_chan = 4,
 294          .range_ai = &range_ai_das1801,
 295          },
 296         {
 297          .name = "das-1702st",
 298          .ai_speed = 6250,
 299          .resolution = 12,
 300          .qram_len = 256,
 301          .common = 1,
 302          .do_n_chan = 4,
 303          .ao_ability = 0,
 304          .ao_n_chan = 0,
 305          .range_ai = &range_ai_das1802,
 306          },
 307         {
 308          .name = "das-1702st-da",
 309          .ai_speed = 6250,
 310          .resolution = 12,
 311          .qram_len = 256,
 312          .common = 1,
 313          .do_n_chan = 4,
 314          .ao_ability = 1,
 315          .ao_n_chan = 4,
 316          .range_ai = &range_ai_das1802,
 317          },
 318         {
 319          .name = "das-1702hr",
 320          .ai_speed = 20000,
 321          .resolution = 16,
 322          .qram_len = 256,
 323          .common = 1,
 324          .do_n_chan = 4,
 325          .ao_ability = 0,
 326          .ao_n_chan = 0,
 327          .range_ai = &range_ai_das1802,
 328          },
 329         {
 330          .name = "das-1702hr-da",
 331          .ai_speed = 20000,
 332          .resolution = 16,
 333          .qram_len = 256,
 334          .common = 1,
 335          .do_n_chan = 4,
 336          .ao_ability = 1,
 337          .ao_n_chan = 2,
 338          .range_ai = &range_ai_das1802,
 339          },
 340         {
 341          .name = "das-1701ao",
 342          .ai_speed = 6250,
 343          .resolution = 12,
 344          .qram_len = 256,
 345          .common = 1,
 346          .do_n_chan = 4,
 347          .ao_ability = 2,
 348          .ao_n_chan = 2,
 349          .range_ai = &range_ai_das1801,
 350          },
 351         {
 352          .name = "das-1702ao",
 353          .ai_speed = 6250,
 354          .resolution = 12,
 355          .qram_len = 256,
 356          .common = 1,
 357          .do_n_chan = 4,
 358          .ao_ability = 2,
 359          .ao_n_chan = 2,
 360          .range_ai = &range_ai_das1802,
 361          },
 362         {
 363          .name = "das-1801st",
 364          .ai_speed = 3000,
 365          .resolution = 12,
 366          .qram_len = 256,
 367          .common = 1,
 368          .do_n_chan = 4,
 369          .ao_ability = 0,
 370          .ao_n_chan = 0,
 371          .range_ai = &range_ai_das1801,
 372          },
 373         {
 374          .name = "das-1801st-da",
 375          .ai_speed = 3000,
 376          .resolution = 12,
 377          .qram_len = 256,
 378          .common = 1,
 379          .do_n_chan = 4,
 380          .ao_ability = 0,
 381          .ao_n_chan = 4,
 382          .range_ai = &range_ai_das1801,
 383          },
 384         {
 385          .name = "das-1802st",
 386          .ai_speed = 3000,
 387          .resolution = 12,
 388          .qram_len = 256,
 389          .common = 1,
 390          .do_n_chan = 4,
 391          .ao_ability = 0,
 392          .ao_n_chan = 0,
 393          .range_ai = &range_ai_das1802,
 394          },
 395         {
 396          .name = "das-1802st-da",
 397          .ai_speed = 3000,
 398          .resolution = 12,
 399          .qram_len = 256,
 400          .common = 1,
 401          .do_n_chan = 4,
 402          .ao_ability = 1,
 403          .ao_n_chan = 4,
 404          .range_ai = &range_ai_das1802,
 405          },
 406         {
 407          .name = "das-1802hr",
 408          .ai_speed = 10000,
 409          .resolution = 16,
 410          .qram_len = 256,
 411          .common = 1,
 412          .do_n_chan = 4,
 413          .ao_ability = 0,
 414          .ao_n_chan = 0,
 415          .range_ai = &range_ai_das1802,
 416          },
 417         {
 418          .name = "das-1802hr-da",
 419          .ai_speed = 10000,
 420          .resolution = 16,
 421          .qram_len = 256,
 422          .common = 1,
 423          .do_n_chan = 4,
 424          .ao_ability = 1,
 425          .ao_n_chan = 2,
 426          .range_ai = &range_ai_das1802,
 427          },
 428         {
 429          .name = "das-1801hc",
 430          .ai_speed = 3000,
 431          .resolution = 12,
 432          .qram_len = 64,
 433          .common = 0,
 434          .do_n_chan = 8,
 435          .ao_ability = 1,
 436          .ao_n_chan = 2,
 437          .range_ai = &range_ai_das1801,
 438          },
 439         {
 440          .name = "das-1802hc",
 441          .ai_speed = 3000,
 442          .resolution = 12,
 443          .qram_len = 64,
 444          .common = 0,
 445          .do_n_chan = 8,
 446          .ao_ability = 1,
 447          .ao_n_chan = 2,
 448          .range_ai = &range_ai_das1802,
 449          },
 450         {
 451          .name = "das-1801ao",
 452          .ai_speed = 3000,
 453          .resolution = 12,
 454          .qram_len = 256,
 455          .common = 1,
 456          .do_n_chan = 4,
 457          .ao_ability = 2,
 458          .ao_n_chan = 2,
 459          .range_ai = &range_ai_das1801,
 460          },
 461         {
 462          .name = "das-1802ao",
 463          .ai_speed = 3000,
 464          .resolution = 12,
 465          .qram_len = 256,
 466          .common = 1,
 467          .do_n_chan = 4,
 468          .ao_ability = 2,
 469          .ao_n_chan = 2,
 470          .range_ai = &range_ai_das1802,
 471          },
 472 };
 473
 474 /*
 475  * Useful for shorthand access to the particular board structure
 476  */
 477 #define thisboard ((const struct das1800_board *)dev->board_ptr)
 478
 479 struct das1800_private {
 480         volatile unsigned int count;    /* number of data points left to be taken */
 481         unsigned int divisor1;  /* value to load into board's counter 1 for timed conversions */
 482         unsigned int divisor2;  /* value to load into board's counter 2 for timed conversions */
 483         int do_bits;            /* digital output bits */
 484         int irq_dma_bits;       /* bits for control register b */
 485         /* dma bits for control register b, stored so that dma can be
 486          * turned on and off */
 487         int dma_bits;
 488         unsigned int dma0;      /* dma channels used */
 489         unsigned int dma1;
 490         volatile unsigned int dma_current;      /* dma channel currently in use */
 491         uint16_t *ai_buf0;      /* pointers to dma buffers */
 492         uint16_t *ai_buf1;
 493         uint16_t *dma_current_buf;      /* pointer to dma buffer currently being used */
 494         unsigned int dma_transfer_size; /* size of transfer currently used, in bytes */
 495         unsigned long iobase2;  /* secondary io address used for analog out on 'ao' boards */
 496         short ao_update_bits;   /* remembers the last write to the 'update' dac */
 497 };
 498
 499 #define devpriv ((struct das1800_private *)dev->private)
 500
 501 /* analog out range for boards with basic analog out */
 502 static const struct comedi_lrange range_ao_1 = {
 503         1,
 504         {
 505          RANGE(-10, 10),
 506          }
 507 };
 508
 509 /* analog out range for 'ao' boards */
 510 /*
 511 static const struct comedi_lrange range_ao_2 = {
 512         2,
 513         {
 514                 RANGE(-10, 10),
 515                 RANGE(-5, 5),
 516         }
 517 };
 518 */
 519
 520 static struct comedi_driver driver_das1800 = {
 521         .driver_name = "das1800",
 522         .module = THIS_MODULE,
 523         .attach = das1800_attach,
 524         .detach = das1800_detach,
 525         .num_names = ARRAY_SIZE(das1800_boards),
 526         .board_name = &das1800_boards[0].name,
 527         .offset = sizeof(struct das1800_board),
 528 };
 529
 530 /*
 531  * A convenient macro that defines init_module() and cleanup_module(),
 532  * as necessary.
 533  */
 534 static int __init driver_das1800_init_module(void)
 535 {
 536         return comedi_driver_register(&driver_das1800);
 537 }
 538
 539 static void __exit driver_das1800_cleanup_module(void)
 540 {
 541         comedi_driver_unregister(&driver_das1800);
 542 }
 543
 544 module_init(driver_das1800_init_module);
 545 module_exit(driver_das1800_cleanup_module);
 546
 547 static int das1800_init_dma(struct comedi_device *dev, unsigned int dma0,
 548                             unsigned int dma1)
 549 {
 550         unsigned long flags;
 551
 552         /*  need an irq to do dma */
 553         if (dev->irq && dma0) {
 554                 /* encode dma0 and dma1 into 2 digit hexadecimal for switch */
 555                 switch ((dma0 & 0x7) | (dma1 << 4)) {
 556                 case 0x5:       /*  dma0 == 5 */
 557                         devpriv->dma_bits |= DMA_CH5;
 558                         break;
 559                 case 0x6:       /*  dma0 == 6 */
 560                         devpriv->dma_bits |= DMA_CH6;
 561                         break;
 562                 case 0x7:       /*  dma0 == 7 */
 563                         devpriv->dma_bits |= DMA_CH7;
 564                         break;
 565                 case 0x65:      /*  dma0 == 5, dma1 == 6 */
 566                         devpriv->dma_bits |= DMA_CH5_CH6;
 567                         break;
 568                 case 0x76:      /*  dma0 == 6, dma1 == 7 */
 569                         devpriv->dma_bits |= DMA_CH6_CH7;
 570                         break;
 571                 case 0x57:      /*  dma0 == 7, dma1 == 5 */
 572                         devpriv->dma_bits |= DMA_CH7_CH5;
 573                         break;
 574                 default:
 575                         printk(" only supports dma channels 5 through 7\n"
 576                                " Dual dma only allows the following combinations:\n"
 577                                " dma 5,6 / 6,7 / or 7,5\n");
 578                         return -EINVAL;
 579                         break;
 580                 }
 581                 if (request_dma(dma0, driver_das1800.driver_name)) {
 582                         printk(" failed to allocate dma channel %i\n", dma0);
 583                         return -EINVAL;
 584                 }
 585                 devpriv->dma0 = dma0;
 586                 devpriv->dma_current = dma0;
 587                 if (dma1) {
 588                         if (request_dma(dma1, driver_das1800.driver_name)) {
 589                                 printk(" failed to allocate dma channel %i\n",
 590                                        dma1);
 591                                 return -EINVAL;
 592                         }
 593                         devpriv->dma1 = dma1;
 594                 }
 595                 devpriv->ai_buf0 = kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
 596                 if (devpriv->ai_buf0 == NULL)
 597                         return -ENOMEM;
 598                 devpriv->dma_current_buf = devpriv->ai_buf0;
 599                 if (dma1) {
 600                         devpriv->ai_buf1 =
 601                             kmalloc(DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA);
 602                         if (devpriv->ai_buf1 == NULL)
 603                                 return -ENOMEM;
 604                 }
 605                 flags = claim_dma_lock();
 606                 disable_dma(devpriv->dma0);
 607                 set_dma_mode(devpriv->dma0, DMA_MODE_READ);
 608                 if (dma1) {
 609                         disable_dma(devpriv->dma1);
 610                         set_dma_mode(devpriv->dma1, DMA_MODE_READ);
 611                 }
 612                 release_dma_lock(flags);
 613         }
 614         return 0;
 615 }
 616
 617 static int das1800_attach(struct comedi_device *dev,
 618                           struct comedi_devconfig *it)
 619 {
 620         struct comedi_subdevice *s;
 621         unsigned long iobase = it->options[0];
 622         unsigned int irq = it->options[1];
 623         unsigned int dma0 = it->options[2];
 624         unsigned int dma1 = it->options[3];
 625         unsigned long iobase2;
 626         int board;
 627         int retval;
 628
 629         /* allocate and initialize dev->private */
 630         if (alloc_private(dev, sizeof(struct das1800_private)) < 0)
 631                 return -ENOMEM;
 632
 633         printk("comedi%d: %s: io 0x%lx", dev->minor, driver_das1800.driver_name,
 634                iobase);
 635         if (irq) {
 636                 printk(", irq %u", irq);
 637                 if (dma0) {
 638                         printk(", dma %u", dma0);
 639                         if (dma1)
 640                                 printk(" and %u", dma1);
 641                 }
 642         }
 643         printk("\n");
 644
 645         if (iobase == 0) {
 646                 printk(" io base address required\n");
 647                 return -EINVAL;
 648         }
 649
 650         /* check if io addresses are available */
 651         if (!request_region(iobase, DAS1800_SIZE, driver_das1800.driver_name)) {
 652                 printk
 653                     (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
 654                      iobase, iobase + DAS1800_SIZE - 1);
 655                 return -EIO;
 656         }
 657         dev->iobase = iobase;
 658
 659         board = das1800_probe(dev);
 660         if (board < 0) {
 661                 printk(" unable to determine board type\n");
 662                 return -ENODEV;
 663         }
 664
 665         dev->board_ptr = das1800_boards + board;
 666         dev->board_name = thisboard->name;
 667
 668         /*  if it is an 'ao' board with fancy analog out then we need extra io ports */
 669         if (thisboard->ao_ability == 2) {
 670                 iobase2 = iobase + IOBASE2;
 671                 if (!request_region(iobase2, DAS1800_SIZE,
 672                                     driver_das1800.driver_name)) {
 673                         printk
 674                             (" I/O port conflict: failed to allocate ports 0x%lx to 0x%lx\n",
 675                              iobase2, iobase2 + DAS1800_SIZE - 1);
 676                         return -EIO;
 677                 }
 678                 devpriv->iobase2 = iobase2;
 679         }
 680
 681         /* grab our IRQ */
 682         if (irq) {
 683                 if (request_irq(irq, das1800_interrupt, 0,
 684                                 driver_das1800.driver_name, dev)) {
 685                         printk(" unable to allocate irq %u\n", irq);
 686                         return -EINVAL;
 687                 }
 688         }
 689         dev->irq = irq;
 690
 691         /*  set bits that tell card which irq to use */
 692         switch (irq) {
 693         case 0:
 694                 break;
 695         case 3:
 696                 devpriv->irq_dma_bits |= 0x8;
 697                 break;
 698         case 5:
 699                 devpriv->irq_dma_bits |= 0x10;
 700                 break;
 701         case 7:
 702                 devpriv->irq_dma_bits |= 0x18;
 703                 break;
 704         case 10:
 705                 devpriv->irq_dma_bits |= 0x28;
 706                 break;
 707         case 11:
 708                 devpriv->irq_dma_bits |= 0x30;
 709                 break;
 710         case 15:
 711                 devpriv->irq_dma_bits |= 0x38;
 712                 break;
 713         default:
 714                 printk(" irq out of range\n");
 715                 return -EINVAL;
 716                 break;
 717         }
 718
 719         retval = das1800_init_dma(dev, dma0, dma1);
 720         if (retval < 0)
 721                 return retval;
 722
 723         if (devpriv->ai_buf0 == NULL) {
 724                 devpriv->ai_buf0 =
 725                     kmalloc(FIFO_SIZE * sizeof(uint16_t), GFP_KERNEL);
 726                 if (devpriv->ai_buf0 == NULL)
 727                         return -ENOMEM;
 728         }
 729
 730         if (alloc_subdevices(dev, 4) < 0)
 731                 return -ENOMEM;
 732
 733         /* analog input subdevice */
 734         s = dev->subdevices + 0;
 735         dev->read_subdev = s;
 736         s->type = COMEDI_SUBD_AI;
 737         s->subdev_flags = SDF_READABLE | SDF_DIFF | SDF_GROUND | SDF_CMD_READ;
 738         if (thisboard->common)
 739                 s->subdev_flags |= SDF_COMMON;
 740         s->n_chan = thisboard->qram_len;
 741         s->len_chanlist = thisboard->qram_len;
 742         s->maxdata = (1 << thisboard->resolution) - 1;
 743         s->range_table = thisboard->range_ai;
 744         s->do_cmd = das1800_ai_do_cmd;
 745         s->do_cmdtest = das1800_ai_do_cmdtest;
 746         s->insn_read = das1800_ai_rinsn;
 747         s->poll = das1800_ai_poll;
 748         s->cancel = das1800_cancel;
 749
 750         /* analog out */
 751         s = dev->subdevices + 1;
 752         if (thisboard->ao_ability == 1) {
 753                 s->type = COMEDI_SUBD_AO;
 754                 s->subdev_flags = SDF_WRITABLE;
 755                 s->n_chan = thisboard->ao_n_chan;
 756                 s->maxdata = (1 << thisboard->resolution) - 1;
 757                 s->range_table = &range_ao_1;
 758                 s->insn_write = das1800_ao_winsn;
 759         } else {
 760                 s->type = COMEDI_SUBD_UNUSED;
 761         }
 762
 763         /* di */
 764         s = dev->subdevices + 2;
 765         s->type = COMEDI_SUBD_DI;
 766         s->subdev_flags = SDF_READABLE;
 767         s->n_chan = 4;
 768         s->maxdata = 1;
 769         s->range_table = &range_digital;
 770         s->insn_bits = das1800_di_rbits;
 771
 772         /* do */
 773         s = dev->subdevices + 3;
 774         s->type = COMEDI_SUBD_DO;
 775         s->subdev_flags = SDF_WRITABLE | SDF_READABLE;
 776         s->n_chan = thisboard->do_n_chan;
 777         s->maxdata = 1;
 778         s->range_table = &range_digital;
 779         s->insn_bits = das1800_do_wbits;
 780
 781         das1800_cancel(dev, dev->read_subdev);
 782
 783         /*  initialize digital out channels */
 784         outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
 785
 786         /*  initialize analog out channels */
 787         if (thisboard->ao_ability == 1) {
 788                 /*  select 'update' dac channel for baseAddress + 0x0 */
 789                 outb(DAC(thisboard->ao_n_chan - 1),
 790                      dev->iobase + DAS1800_SELECT);
 791                 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
 792         }
 793
 794         return 0;
 795 };
 796
 797 static int das1800_detach(struct comedi_device *dev)
 798 {
 799         /* only free stuff if it has been allocated by _attach */
 800         if (dev->iobase)
 801                 release_region(dev->iobase, DAS1800_SIZE);
 802         if (dev->irq)
 803                 free_irq(dev->irq, dev);
 804         if (dev->private) {
 805                 if (devpriv->iobase2)
 806                         release_region(devpriv->iobase2, DAS1800_SIZE);
 807                 if (devpriv->dma0)
 808                         free_dma(devpriv->dma0);
 809                 if (devpriv->dma1)
 810                         free_dma(devpriv->dma1);
 811                 kfree(devpriv->ai_buf0);
 812                 kfree(devpriv->ai_buf1);
 813         }
 814
 815         printk("comedi%d: %s: remove\n", dev->minor,
 816                driver_das1800.driver_name);
 817
 818         return 0;
 819 };
 820
 821 /* probes and checks das-1800 series board type
 822  */
 823 static int das1800_probe(struct comedi_device *dev)
 824 {
 825         int id;
 826         int board;
 827
 828         id = (inb(dev->iobase + DAS1800_DIGITAL) >> 4) & 0xf;   /* get id bits */
 829         board = ((struct das1800_board *)dev->board_ptr) - das1800_boards;
 830
 831         switch (id) {
 832         case 0x3:
 833                 if (board == das1801st_da || board == das1802st_da ||
 834                     board == das1701st_da || board == das1702st_da) {
 835                         printk(" Board model: %s\n",
 836                                das1800_boards[board].name);
 837                         return board;
 838                 }
 839                 printk
 840                     (" Board model (probed, not recommended): das-1800st-da series\n");
 841                 return das1801st;
 842                 break;
 843         case 0x4:
 844                 if (board == das1802hr_da || board == das1702hr_da) {
 845                         printk(" Board model: %s\n",
 846                                das1800_boards[board].name);
 847                         return board;
 848                 }
 849                 printk
 850                     (" Board model (probed, not recommended): das-1802hr-da\n");
 851                 return das1802hr;
 852                 break;
 853         case 0x5:
 854                 if (board == das1801ao || board == das1802ao ||
 855                     board == das1701ao || board == das1702ao) {
 856                         printk(" Board model: %s\n",
 857                                das1800_boards[board].name);
 858                         return board;
 859                 }
 860                 printk
 861                     (" Board model (probed, not recommended): das-1800ao series\n");
 862                 return das1801ao;
 863                 break;
 864         case 0x6:
 865                 if (board == das1802hr || board == das1702hr) {
 866                         printk(" Board model: %s\n",
 867                                das1800_boards[board].name);
 868                         return board;
 869                 }
 870                 printk(" Board model (probed, not recommended): das-1802hr\n");
 871                 return das1802hr;
 872                 break;
 873         case 0x7:
 874                 if (board == das1801st || board == das1802st ||
 875                     board == das1701st || board == das1702st) {
 876                         printk(" Board model: %s\n",
 877                                das1800_boards[board].name);
 878                         return board;
 879                 }
 880                 printk
 881                     (" Board model (probed, not recommended): das-1800st series\n");
 882                 return das1801st;
 883                 break;
 884         case 0x8:
 885                 if (board == das1801hc || board == das1802hc) {
 886                         printk(" Board model: %s\n",
 887                                das1800_boards[board].name);
 888                         return board;
 889                 }
 890                 printk
 891                     (" Board model (probed, not recommended): das-1800hc series\n");
 892                 return das1801hc;
 893                 break;
 894         default:
 895                 printk
 896                     (" Board model: probe returned 0x%x (unknown, please report)\n",
 897                      id);
 898                 return board;
 899                 break;
 900         }
 901         return -1;
 902 }
 903
 904 static int das1800_ai_poll(struct comedi_device *dev,
 905                            struct comedi_subdevice *s)
 906 {
 907         unsigned long flags;
 908
 909         /*  prevent race with interrupt handler */
 910         spin_lock_irqsave(&dev->spinlock, flags);
 911         das1800_ai_handler(dev);
 912         spin_unlock_irqrestore(&dev->spinlock, flags);
 913
 914         return s->async->buf_write_count - s->async->buf_read_count;
 915 }
 916
 917 static irqreturn_t das1800_interrupt(int irq, void *d)
 918 {
 919         struct comedi_device *dev = d;
 920         unsigned int status;
 921
 922         if (dev->attached == 0) {
 923                 comedi_error(dev, "premature interrupt");
 924                 return IRQ_HANDLED;
 925         }
 926
 927         /* Prevent race with das1800_ai_poll() on multi processor systems.
 928          * Also protects indirect addressing in das1800_ai_handler */
 929         spin_lock(&dev->spinlock);
 930         status = inb(dev->iobase + DAS1800_STATUS);
 931
 932         /* if interrupt was not caused by das-1800 */
 933         if (!(status & INT)) {
 934                 spin_unlock(&dev->spinlock);
 935                 return IRQ_NONE;
 936         }
 937         /* clear the interrupt status bit INT */
 938         outb(CLEAR_INTR_MASK & ~INT, dev->iobase + DAS1800_STATUS);
 939         /*  handle interrupt */
 940         das1800_ai_handler(dev);
 941
 942         spin_unlock(&dev->spinlock);
 943         return IRQ_HANDLED;
 944 }
 945
 946 /* the guts of the interrupt handler, that is shared with das1800_ai_poll */
 947 static void das1800_ai_handler(struct comedi_device *dev)
 948 {
 949         struct comedi_subdevice *s = dev->subdevices + 0;       /* analog input subdevice */
 950         struct comedi_async *async = s->async;
 951         struct comedi_cmd *cmd = &async->cmd;
 952         unsigned int status = inb(dev->iobase + DAS1800_STATUS);
 953
 954         async->events = 0;
 955         /*  select adc for base address + 0 */
 956         outb(ADC, dev->iobase + DAS1800_SELECT);
 957         /*  dma buffer full */
 958         if (devpriv->irq_dma_bits & DMA_ENABLED) {
 959                 /*  look for data from dma transfer even if dma terminal count hasn't happened yet */
 960                 das1800_handle_dma(dev, s, status);
 961         } else if (status & FHF) {      /*  if fifo half full */
 962                 das1800_handle_fifo_half_full(dev, s);
 963         } else if (status & FNE) {      /*  if fifo not empty */
 964                 das1800_handle_fifo_not_empty(dev, s);
 965         }
 966
 967         async->events |= COMEDI_CB_BLOCK;
 968         /* if the card's fifo has overflowed */
 969         if (status & OVF) {
 970                 /*  clear OVF interrupt bit */
 971                 outb(CLEAR_INTR_MASK & ~OVF, dev->iobase + DAS1800_STATUS);
 972                 comedi_error(dev, "DAS1800 FIFO overflow");
 973                 das1800_cancel(dev, s);
 974                 async->events |= COMEDI_CB_ERROR | COMEDI_CB_EOA;
 975                 comedi_event(dev, s);
 976                 return;
 977         }
 978         /*  stop taking data if appropriate */
 979         /* stop_src TRIG_EXT */
 980         if (status & CT0TC) {
 981                 /*  clear CT0TC interrupt bit */
 982                 outb(CLEAR_INTR_MASK & ~CT0TC, dev->iobase + DAS1800_STATUS);
 983                 /*  make sure we get all remaining data from board before quitting */
 984                 if (devpriv->irq_dma_bits & DMA_ENABLED)
 985                         das1800_flush_dma(dev, s);
 986                 else
 987                         das1800_handle_fifo_not_empty(dev, s);
 988                 das1800_cancel(dev, s); /* disable hardware conversions */
 989                 async->events |= COMEDI_CB_EOA;
 990         } else if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0) {        /*  stop_src TRIG_COUNT */
 991                 das1800_cancel(dev, s); /* disable hardware conversions */
 992                 async->events |= COMEDI_CB_EOA;
 993         }
 994
 995         comedi_event(dev, s);
 996
 997         return;
 998 }
 999
1000 static void das1800_handle_dma(struct comedi_device *dev,
1001                                struct comedi_subdevice *s, unsigned int status)
1002 {
1003         unsigned long flags;
1004         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1005
1006         flags = claim_dma_lock();
1007         das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1008                                   devpriv->dma_current_buf);
1009         /*  re-enable  dma channel */
1010         set_dma_addr(devpriv->dma_current,
1011                      virt_to_bus(devpriv->dma_current_buf));
1012         set_dma_count(devpriv->dma_current, devpriv->dma_transfer_size);
1013         enable_dma(devpriv->dma_current);
1014         release_dma_lock(flags);
1015
1016         if (status & DMATC) {
1017                 /*  clear DMATC interrupt bit */
1018                 outb(CLEAR_INTR_MASK & ~DMATC, dev->iobase + DAS1800_STATUS);
1019                 /*  switch dma channels for next time, if appropriate */
1020                 if (dual_dma) {
1021                         /*  read data from the other channel next time */
1022                         if (devpriv->dma_current == devpriv->dma0) {
1023                                 devpriv->dma_current = devpriv->dma1;
1024                                 devpriv->dma_current_buf = devpriv->ai_buf1;
1025                         } else {
1026                                 devpriv->dma_current = devpriv->dma0;
1027                                 devpriv->dma_current_buf = devpriv->ai_buf0;
1028                         }
1029                 }
1030         }
1031
1032         return;
1033 }
1034
1035 static inline uint16_t munge_bipolar_sample(const struct comedi_device *dev,
1036                                             uint16_t sample)
1037 {
1038         sample += 1 << (thisboard->resolution - 1);
1039         return sample;
1040 }
1041
1042 static void munge_data(struct comedi_device *dev, uint16_t * array,
1043                        unsigned int num_elements)
1044 {
1045         unsigned int i;
1046         int unipolar;
1047
1048         /* see if card is using a unipolar or bipolar range so we can munge data correctly */
1049         unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1050
1051         /* convert to unsigned type if we are in a bipolar mode */
1052         if (!unipolar) {
1053                 for (i = 0; i < num_elements; i++) {
1054                         array[i] = munge_bipolar_sample(dev, array[i]);
1055                 }
1056         }
1057 }
1058
1059 /* Utility function used by das1800_flush_dma() and das1800_handle_dma().
1060  * Assumes dma lock is held */
1061 static void das1800_flush_dma_channel(struct comedi_device *dev,
1062                                       struct comedi_subdevice *s,
1063                                       unsigned int channel, uint16_t * buffer)
1064 {
1065         unsigned int num_bytes, num_samples;
1066         struct comedi_cmd *cmd = &s->async->cmd;
1067
1068         disable_dma(channel);
1069
1070         /* clear flip-flop to make sure 2-byte registers
1071          * get set correctly */
1072         clear_dma_ff(channel);
1073
1074         /*  figure out how many points to read */
1075         num_bytes = devpriv->dma_transfer_size - get_dma_residue(channel);
1076         num_samples = num_bytes / sizeof(short);
1077
1078         /* if we only need some of the points */
1079         if (cmd->stop_src == TRIG_COUNT && devpriv->count < num_samples)
1080                 num_samples = devpriv->count;
1081
1082         munge_data(dev, buffer, num_samples);
1083         cfc_write_array_to_buffer(s, buffer, num_bytes);
1084         if (s->async->cmd.stop_src == TRIG_COUNT)
1085                 devpriv->count -= num_samples;
1086
1087         return;
1088 }
1089
1090 /* flushes remaining data from board when external trigger has stopped aquisition
1091  * and we are using dma transfers */
1092 static void das1800_flush_dma(struct comedi_device *dev,
1093                               struct comedi_subdevice *s)
1094 {
1095         unsigned long flags;
1096         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1097
1098         flags = claim_dma_lock();
1099         das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1100                                   devpriv->dma_current_buf);
1101
1102         if (dual_dma) {
1103                 /*  switch to other channel and flush it */
1104                 if (devpriv->dma_current == devpriv->dma0) {
1105                         devpriv->dma_current = devpriv->dma1;
1106                         devpriv->dma_current_buf = devpriv->ai_buf1;
1107                 } else {
1108                         devpriv->dma_current = devpriv->dma0;
1109                         devpriv->dma_current_buf = devpriv->ai_buf0;
1110                 }
1111                 das1800_flush_dma_channel(dev, s, devpriv->dma_current,
1112                                           devpriv->dma_current_buf);
1113         }
1114
1115         release_dma_lock(flags);
1116
1117         /*  get any remaining samples in fifo */
1118         das1800_handle_fifo_not_empty(dev, s);
1119
1120         return;
1121 }
1122
1123 static void das1800_handle_fifo_half_full(struct comedi_device *dev,
1124                                           struct comedi_subdevice *s)
1125 {
1126         int numPoints = 0;      /* number of points to read */
1127         struct comedi_cmd *cmd = &s->async->cmd;
1128
1129         numPoints = FIFO_SIZE / 2;
1130         /* if we only need some of the points */
1131         if (cmd->stop_src == TRIG_COUNT && devpriv->count < numPoints)
1132                 numPoints = devpriv->count;
1133         insw(dev->iobase + DAS1800_FIFO, devpriv->ai_buf0, numPoints);
1134         munge_data(dev, devpriv->ai_buf0, numPoints);
1135         cfc_write_array_to_buffer(s, devpriv->ai_buf0,
1136                                   numPoints * sizeof(devpriv->ai_buf0[0]));
1137         if (cmd->stop_src == TRIG_COUNT)
1138                 devpriv->count -= numPoints;
1139         return;
1140 }
1141
1142 static void das1800_handle_fifo_not_empty(struct comedi_device *dev,
1143                                           struct comedi_subdevice *s)
1144 {
1145         short dpnt;
1146         int unipolar;
1147         struct comedi_cmd *cmd = &s->async->cmd;
1148
1149         unipolar = inb(dev->iobase + DAS1800_CONTROL_C) & UB;
1150
1151         while (inb(dev->iobase + DAS1800_STATUS) & FNE) {
1152                 if (cmd->stop_src == TRIG_COUNT && devpriv->count == 0)
1153                         break;
1154                 dpnt = inw(dev->iobase + DAS1800_FIFO);
1155                 /* convert to unsigned type if we are in a bipolar mode */
1156                 if (!unipolar) ;
1157                 dpnt = munge_bipolar_sample(dev, dpnt);
1158                 cfc_write_to_buffer(s, dpnt);
1159                 if (cmd->stop_src == TRIG_COUNT)
1160                         devpriv->count--;
1161         }
1162
1163         return;
1164 }
1165
1166 static int das1800_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
1167 {
1168         outb(0x0, dev->iobase + DAS1800_STATUS);        /* disable conversions */
1169         outb(0x0, dev->iobase + DAS1800_CONTROL_B);     /* disable interrupts and dma */
1170         outb(0x0, dev->iobase + DAS1800_CONTROL_A);     /* disable and clear fifo and stop triggering */
1171         if (devpriv->dma0)
1172                 disable_dma(devpriv->dma0);
1173         if (devpriv->dma1)
1174                 disable_dma(devpriv->dma1);
1175         return 0;
1176 }
1177
1178 /* test analog input cmd */
1179 static int das1800_ai_do_cmdtest(struct comedi_device *dev,
1180                                  struct comedi_subdevice *s,
1181                                  struct comedi_cmd *cmd)
1182 {
1183         int err = 0;
1184         int tmp;
1185         unsigned int tmp_arg;
1186         int i;
1187         int unipolar;
1188
1189         /* step 1: make sure trigger sources are trivially valid */
1190
1191         tmp = cmd->start_src;
1192         cmd->start_src &= TRIG_NOW | TRIG_EXT;
1193         if (!cmd->start_src || tmp != cmd->start_src)
1194                 err++;
1195
1196         tmp = cmd->scan_begin_src;
1197         cmd->scan_begin_src &= TRIG_FOLLOW | TRIG_TIMER | TRIG_EXT;
1198         if (!cmd->scan_begin_src || tmp != cmd->scan_begin_src)
1199                 err++;
1200
1201         tmp = cmd->convert_src;
1202         cmd->convert_src &= TRIG_TIMER | TRIG_EXT;
1203         if (!cmd->convert_src || tmp != cmd->convert_src)
1204                 err++;
1205
1206         tmp = cmd->scan_end_src;
1207         cmd->scan_end_src &= TRIG_COUNT;
1208         if (!cmd->scan_end_src || tmp != cmd->scan_end_src)
1209                 err++;
1210
1211         tmp = cmd->stop_src;
1212         cmd->stop_src &= TRIG_COUNT | TRIG_EXT | TRIG_NONE;
1213         if (!cmd->stop_src || tmp != cmd->stop_src)
1214                 err++;
1215
1216         if (err)
1217                 return 1;
1218
1219         /* step 2: make sure trigger sources are unique and mutually compatible */
1220
1221         /*  uniqueness check */
1222         if (cmd->start_src != TRIG_NOW && cmd->start_src != TRIG_EXT)
1223                 err++;
1224         if (cmd->scan_begin_src != TRIG_FOLLOW &&
1225             cmd->scan_begin_src != TRIG_TIMER &&
1226             cmd->scan_begin_src != TRIG_EXT)
1227                 err++;
1228         if (cmd->convert_src != TRIG_TIMER && cmd->convert_src != TRIG_EXT)
1229                 err++;
1230         if (cmd->stop_src != TRIG_COUNT &&
1231             cmd->stop_src != TRIG_NONE && cmd->stop_src != TRIG_EXT)
1232                 err++;
1233         /* compatibility check */
1234         if (cmd->scan_begin_src != TRIG_FOLLOW &&
1235             cmd->convert_src != TRIG_TIMER)
1236                 err++;
1237
1238         if (err)
1239                 return 2;
1240
1241         /* step 3: make sure arguments are trivially compatible */
1242
1243         if (cmd->start_arg != 0) {
1244                 cmd->start_arg = 0;
1245                 err++;
1246         }
1247         if (cmd->convert_src == TRIG_TIMER) {
1248                 if (cmd->convert_arg < thisboard->ai_speed) {
1249                         cmd->convert_arg = thisboard->ai_speed;
1250                         err++;
1251                 }
1252         }
1253         if (!cmd->chanlist_len) {
1254                 cmd->chanlist_len = 1;
1255                 err++;
1256         }
1257         if (cmd->scan_end_arg != cmd->chanlist_len) {
1258                 cmd->scan_end_arg = cmd->chanlist_len;
1259                 err++;
1260         }
1261
1262         switch (cmd->stop_src) {
1263         case TRIG_COUNT:
1264                 if (!cmd->stop_arg) {
1265                         cmd->stop_arg = 1;
1266                         err++;
1267                 }
1268                 break;
1269         case TRIG_NONE:
1270                 if (cmd->stop_arg != 0) {
1271                         cmd->stop_arg = 0;
1272                         err++;
1273                 }
1274                 break;
1275         default:
1276                 break;
1277         }
1278
1279         if (err)
1280                 return 3;
1281
1282         /* step 4: fix up any arguments */
1283
1284         if (cmd->convert_src == TRIG_TIMER) {
1285                 /*  if we are not in burst mode */
1286                 if (cmd->scan_begin_src == TRIG_FOLLOW) {
1287                         tmp_arg = cmd->convert_arg;
1288                         /* calculate counter values that give desired timing */
1289                         i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1290                                                        &(devpriv->divisor1),
1291                                                        &(devpriv->divisor2),
1292                                                        &(cmd->convert_arg),
1293                                                        cmd->
1294                                                        flags & TRIG_ROUND_MASK);
1295                         if (tmp_arg != cmd->convert_arg)
1296                                 err++;
1297                 }
1298                 /*  if we are in burst mode */
1299                 else {
1300                         /*  check that convert_arg is compatible */
1301                         tmp_arg = cmd->convert_arg;
1302                         cmd->convert_arg =
1303                             burst_convert_arg(cmd->convert_arg,
1304                                               cmd->flags & TRIG_ROUND_MASK);
1305                         if (tmp_arg != cmd->convert_arg)
1306                                 err++;
1307
1308                         if (cmd->scan_begin_src == TRIG_TIMER) {
1309                                 /*  if scans are timed faster than conversion rate allows */
1310                                 if (cmd->convert_arg * cmd->chanlist_len >
1311                                     cmd->scan_begin_arg) {
1312                                         cmd->scan_begin_arg =
1313                                             cmd->convert_arg *
1314                                             cmd->chanlist_len;
1315                                         err++;
1316                                 }
1317                                 tmp_arg = cmd->scan_begin_arg;
1318                                 /* calculate counter values that give desired timing */
1319                                 i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1320                                                                &(devpriv->
1321                                                                  divisor1),
1322                                                                &(devpriv->
1323                                                                  divisor2),
1324                                                                &(cmd->
1325                                                                  scan_begin_arg),
1326                                                                cmd->
1327                                                                flags &
1328                                                                TRIG_ROUND_MASK);
1329                                 if (tmp_arg != cmd->scan_begin_arg)
1330                                         err++;
1331                         }
1332                 }
1333         }
1334
1335         if (err)
1336                 return 4;
1337
1338         /*  make sure user is not trying to mix unipolar and bipolar ranges */
1339         if (cmd->chanlist) {
1340                 unipolar = CR_RANGE(cmd->chanlist[0]) & UNIPOLAR;
1341                 for (i = 1; i < cmd->chanlist_len; i++) {
1342                         if (unipolar != (CR_RANGE(cmd->chanlist[i]) & UNIPOLAR)) {
1343                                 comedi_error(dev,
1344                                              "unipolar and bipolar ranges cannot be mixed in the chanlist");
1345                                 err++;
1346                                 break;
1347                         }
1348                 }
1349         }
1350
1351         if (err)
1352                 return 5;
1353
1354         return 0;
1355 }
1356
1357 /* analog input cmd interface */
1358
1359 /* first, some utility functions used in the main ai_do_cmd() */
1360
1361 /* returns appropriate bits for control register a, depending on command */
1362 static int control_a_bits(struct comedi_cmd cmd)
1363 {
1364         int control_a;
1365
1366         control_a = FFEN;       /* enable fifo */
1367         if (cmd.stop_src == TRIG_EXT) {
1368                 control_a |= ATEN;
1369         }
1370         switch (cmd.start_src) {
1371         case TRIG_EXT:
1372                 control_a |= TGEN | CGSL;
1373                 break;
1374         case TRIG_NOW:
1375                 control_a |= CGEN;
1376                 break;
1377         default:
1378                 break;
1379         }
1380
1381         return control_a;
1382 }
1383
1384 /* returns appropriate bits for control register c, depending on command */
1385 static int control_c_bits(struct comedi_cmd cmd)
1386 {
1387         int control_c;
1388         int aref;
1389
1390         /* set clock source to internal or external, select analog reference,
1391          * select unipolar / bipolar
1392          */
1393         aref = CR_AREF(cmd.chanlist[0]);
1394         control_c = UQEN;       /* enable upper qram addresses */
1395         if (aref != AREF_DIFF)
1396                 control_c |= SD;
1397         if (aref == AREF_COMMON)
1398                 control_c |= CMEN;
1399         /* if a unipolar range was selected */
1400         if (CR_RANGE(cmd.chanlist[0]) & UNIPOLAR)
1401                 control_c |= UB;
1402         switch (cmd.scan_begin_src) {
1403         case TRIG_FOLLOW:       /*  not in burst mode */
1404                 switch (cmd.convert_src) {
1405                 case TRIG_TIMER:
1406                         /* trig on cascaded counters */
1407                         control_c |= IPCLK;
1408                         break;
1409                 case TRIG_EXT:
1410                         /* trig on falling edge of external trigger */
1411                         control_c |= XPCLK;
1412                         break;
1413                 default:
1414                         break;
1415                 }
1416                 break;
1417         case TRIG_TIMER:
1418                 /*  burst mode with internal pacer clock */
1419                 control_c |= BMDE | IPCLK;
1420                 break;
1421         case TRIG_EXT:
1422                 /*  burst mode with external trigger */
1423                 control_c |= BMDE | XPCLK;
1424                 break;
1425         default:
1426                 break;
1427         }
1428
1429         return control_c;
1430 }
1431
1432 /* sets up counters */
1433 static int setup_counters(struct comedi_device *dev, struct comedi_cmd cmd)
1434 {
1435         /*  setup cascaded counters for conversion/scan frequency */
1436         switch (cmd.scan_begin_src) {
1437         case TRIG_FOLLOW:       /*  not in burst mode */
1438                 if (cmd.convert_src == TRIG_TIMER) {
1439                         /* set conversion frequency */
1440                         i8253_cascade_ns_to_timer_2div(TIMER_BASE,
1441                                                        &(devpriv->divisor1),
1442                                                        &(devpriv->divisor2),
1443                                                        &(cmd.convert_arg),
1444                                                        cmd.
1445                                                        flags & TRIG_ROUND_MASK);
1446                         if (das1800_set_frequency(dev) < 0) {
1447                                 return -1;
1448                         }
1449                 }
1450                 break;
1451         case TRIG_TIMER:        /*  in burst mode */
1452                 /* set scan frequency */
1453                 i8253_cascade_ns_to_timer_2div(TIMER_BASE, &(devpriv->divisor1),
1454                                                &(devpriv->divisor2),
1455                                                &(cmd.scan_begin_arg),
1456                                                cmd.flags & TRIG_ROUND_MASK);
1457                 if (das1800_set_frequency(dev) < 0) {
1458                         return -1;
1459                 }
1460                 break;
1461         default:
1462                 break;
1463         }
1464
1465         /*  setup counter 0 for 'about triggering' */
1466         if (cmd.stop_src == TRIG_EXT) {
1467                 /*  load counter 0 in mode 0 */
1468                 i8254_load(dev->iobase + DAS1800_COUNTER, 0, 0, 1, 0);
1469         }
1470
1471         return 0;
1472 }
1473
1474 /* sets up dma */
1475 static void setup_dma(struct comedi_device *dev, struct comedi_cmd cmd)
1476 {
1477         unsigned long lock_flags;
1478         const int dual_dma = devpriv->irq_dma_bits & DMA_DUAL;
1479
1480         if ((devpriv->irq_dma_bits & DMA_ENABLED) == 0)
1481                 return;
1482
1483         /* determine a reasonable dma transfer size */
1484         devpriv->dma_transfer_size = suggest_transfer_size(&cmd);
1485         lock_flags = claim_dma_lock();
1486         disable_dma(devpriv->dma0);
1487         /* clear flip-flop to make sure 2-byte registers for
1488          * count and address get set correctly */
1489         clear_dma_ff(devpriv->dma0);
1490         set_dma_addr(devpriv->dma0, virt_to_bus(devpriv->ai_buf0));
1491         /*  set appropriate size of transfer */
1492         set_dma_count(devpriv->dma0, devpriv->dma_transfer_size);
1493         devpriv->dma_current = devpriv->dma0;
1494         devpriv->dma_current_buf = devpriv->ai_buf0;
1495         enable_dma(devpriv->dma0);
1496         /*  set up dual dma if appropriate */
1497         if (dual_dma) {
1498                 disable_dma(devpriv->dma1);
1499                 /* clear flip-flop to make sure 2-byte registers for
1500                  * count and address get set correctly */
1501                 clear_dma_ff(devpriv->dma1);
1502                 set_dma_addr(devpriv->dma1, virt_to_bus(devpriv->ai_buf1));
1503                 /*  set appropriate size of transfer */
1504                 set_dma_count(devpriv->dma1, devpriv->dma_transfer_size);
1505                 enable_dma(devpriv->dma1);
1506         }
1507         release_dma_lock(lock_flags);
1508
1509         return;
1510 }
1511
1512 /* programs channel/gain list into card */
1513 static void program_chanlist(struct comedi_device *dev, struct comedi_cmd cmd)
1514 {
1515         int i, n, chan_range;
1516         unsigned long irq_flags;
1517         const int range_mask = 0x3;     /* masks unipolar/bipolar bit off range */
1518         const int range_bitshift = 8;
1519
1520         n = cmd.chanlist_len;
1521         /*  spinlock protects indirect addressing */
1522         spin_lock_irqsave(&dev->spinlock, irq_flags);
1523         outb(QRAM, dev->iobase + DAS1800_SELECT);       /* select QRAM for baseAddress + 0x0 */
1524         outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);        /*set QRAM address start */
1525         /* make channel / gain list */
1526         for (i = 0; i < n; i++) {
1527                 chan_range =
1528                     CR_CHAN(cmd.
1529                             chanlist[i]) | ((CR_RANGE(cmd.chanlist[i]) &
1530                                              range_mask) << range_bitshift);
1531                 outw(chan_range, dev->iobase + DAS1800_QRAM);
1532         }
1533         outb(n - 1, dev->iobase + DAS1800_QRAM_ADDRESS);        /*finish write to QRAM */
1534         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1535
1536         return;
1537 }
1538
1539 /* analog input do_cmd */
1540 static int das1800_ai_do_cmd(struct comedi_device *dev,
1541                              struct comedi_subdevice *s)
1542 {
1543         int ret;
1544         int control_a, control_c;
1545         struct comedi_async *async = s->async;
1546         struct comedi_cmd cmd = async->cmd;
1547
1548         if (!dev->irq) {
1549                 comedi_error(dev,
1550                              "no irq assigned for das-1800, cannot do hardware conversions");
1551                 return -1;
1552         }
1553
1554         /* disable dma on TRIG_WAKE_EOS, or TRIG_RT
1555          * (because dma in handler is unsafe at hard real-time priority) */
1556         if (cmd.flags & (TRIG_WAKE_EOS | TRIG_RT)) {
1557                 devpriv->irq_dma_bits &= ~DMA_ENABLED;
1558         } else {
1559                 devpriv->irq_dma_bits |= devpriv->dma_bits;
1560         }
1561         /*  interrupt on end of conversion for TRIG_WAKE_EOS */
1562         if (cmd.flags & TRIG_WAKE_EOS) {
1563                 /*  interrupt fifo not empty */
1564                 devpriv->irq_dma_bits &= ~FIMD;
1565         } else {
1566                 /*  interrupt fifo half full */
1567                 devpriv->irq_dma_bits |= FIMD;
1568         }
1569         /*  determine how many conversions we need */
1570         if (cmd.stop_src == TRIG_COUNT) {
1571                 devpriv->count = cmd.stop_arg * cmd.chanlist_len;
1572         }
1573
1574         das1800_cancel(dev, s);
1575
1576         /*  determine proper bits for control registers */
1577         control_a = control_a_bits(cmd);
1578         control_c = control_c_bits(cmd);
1579
1580         /* setup card and start */
1581         program_chanlist(dev, cmd);
1582         ret = setup_counters(dev, cmd);
1583         if (ret < 0) {
1584                 comedi_error(dev, "Error setting up counters");
1585                 return ret;
1586         }
1587         setup_dma(dev, cmd);
1588         outb(control_c, dev->iobase + DAS1800_CONTROL_C);
1589         /*  set conversion rate and length for burst mode */
1590         if (control_c & BMDE) {
1591                 /*  program conversion period with number of microseconds minus 1 */
1592                 outb(cmd.convert_arg / 1000 - 1,
1593                      dev->iobase + DAS1800_BURST_RATE);
1594                 outb(cmd.chanlist_len - 1, dev->iobase + DAS1800_BURST_LENGTH);
1595         }
1596         outb(devpriv->irq_dma_bits, dev->iobase + DAS1800_CONTROL_B);   /*  enable irq/dma */
1597         outb(control_a, dev->iobase + DAS1800_CONTROL_A);       /* enable fifo and triggering */
1598         outb(CVEN, dev->iobase + DAS1800_STATUS);       /* enable conversions */
1599
1600         return 0;
1601 }
1602
1603 /* read analog input */
1604 static int das1800_ai_rinsn(struct comedi_device *dev,
1605                             struct comedi_subdevice *s,
1606                             struct comedi_insn *insn, unsigned int *data)
1607 {
1608         int i, n;
1609         int chan, range, aref, chan_range;
1610         int timeout = 1000;
1611         short dpnt;
1612         int conv_flags = 0;
1613         unsigned long irq_flags;
1614
1615         /* set up analog reference and unipolar / bipolar mode */
1616         aref = CR_AREF(insn->chanspec);
1617         conv_flags |= UQEN;
1618         if (aref != AREF_DIFF)
1619                 conv_flags |= SD;
1620         if (aref == AREF_COMMON)
1621                 conv_flags |= CMEN;
1622         /* if a unipolar range was selected */
1623         if (CR_RANGE(insn->chanspec) & UNIPOLAR)
1624                 conv_flags |= UB;
1625
1626         outb(conv_flags, dev->iobase + DAS1800_CONTROL_C);      /* software conversion enabled */
1627         outb(CVEN, dev->iobase + DAS1800_STATUS);       /* enable conversions */
1628         outb(0x0, dev->iobase + DAS1800_CONTROL_A);     /* reset fifo */
1629         outb(FFEN, dev->iobase + DAS1800_CONTROL_A);
1630
1631         chan = CR_CHAN(insn->chanspec);
1632         /* mask of unipolar/bipolar bit from range */
1633         range = CR_RANGE(insn->chanspec) & 0x3;
1634         chan_range = chan | (range << 8);
1635         spin_lock_irqsave(&dev->spinlock, irq_flags);
1636         outb(QRAM, dev->iobase + DAS1800_SELECT);       /* select QRAM for baseAddress + 0x0 */
1637         outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);  /* set QRAM address start */
1638         outw(chan_range, dev->iobase + DAS1800_QRAM);
1639         outb(0x0, dev->iobase + DAS1800_QRAM_ADDRESS);  /*finish write to QRAM */
1640         outb(ADC, dev->iobase + DAS1800_SELECT);        /* select ADC for baseAddress + 0x0 */
1641
1642         for (n = 0; n < insn->n; n++) {
1643                 /* trigger conversion */
1644                 outb(0, dev->iobase + DAS1800_FIFO);
1645                 for (i = 0; i < timeout; i++) {
1646                         if (inb(dev->iobase + DAS1800_STATUS) & FNE)
1647                                 break;
1648                 }
1649                 if (i == timeout) {
1650                         comedi_error(dev, "timeout");
1651                         n = -ETIME;
1652                         goto exit;
1653                 }
1654                 dpnt = inw(dev->iobase + DAS1800_FIFO);
1655                 /* shift data to offset binary for bipolar ranges */
1656                 if ((conv_flags & UB) == 0)
1657                         dpnt += 1 << (thisboard->resolution - 1);
1658                 data[n] = dpnt;
1659         }
1660 exit:
1661         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1662
1663         return n;
1664 }
1665
1666 /* writes to an analog output channel */
1667 static int das1800_ao_winsn(struct comedi_device *dev,
1668                             struct comedi_subdevice *s,
1669                             struct comedi_insn *insn, unsigned int *data)
1670 {
1671         int chan = CR_CHAN(insn->chanspec);
1672 /* int range = CR_RANGE(insn->chanspec); */
1673         int update_chan = thisboard->ao_n_chan - 1;
1674         short output;
1675         unsigned long irq_flags;
1676
1677         /*   card expects two's complement data */
1678         output = data[0] - (1 << (thisboard->resolution - 1));
1679         /*  if the write is to the 'update' channel, we need to remember its value */
1680         if (chan == update_chan)
1681                 devpriv->ao_update_bits = output;
1682         /*  write to channel */
1683         spin_lock_irqsave(&dev->spinlock, irq_flags);
1684         outb(DAC(chan), dev->iobase + DAS1800_SELECT);  /* select dac channel for baseAddress + 0x0 */
1685         outw(output, dev->iobase + DAS1800_DAC);
1686         /*  now we need to write to 'update' channel to update all dac channels */
1687         if (chan != update_chan) {
1688                 outb(DAC(update_chan), dev->iobase + DAS1800_SELECT);   /* select 'update' channel for baseAddress + 0x0 */
1689                 outw(devpriv->ao_update_bits, dev->iobase + DAS1800_DAC);
1690         }
1691         spin_unlock_irqrestore(&dev->spinlock, irq_flags);
1692
1693         return 1;
1694 }
1695
1696 /* reads from digital input channels */
1697 static int das1800_di_rbits(struct comedi_device *dev,
1698                             struct comedi_subdevice *s,
1699                             struct comedi_insn *insn, unsigned int *data)
1700 {
1701
1702         data[1] = inb(dev->iobase + DAS1800_DIGITAL) & 0xf;
1703         data[0] = 0;
1704
1705         return 2;
1706 }
1707
1708 /* writes to digital output channels */
1709 static int das1800_do_wbits(struct comedi_device *dev,
1710                             struct comedi_subdevice *s,
1711                             struct comedi_insn *insn, unsigned int *data)
1712 {
1713         unsigned int wbits;
1714
1715         /*  only set bits that have been masked */
1716         data[0] &= (1 << s->n_chan) - 1;
1717         wbits = devpriv->do_bits;
1718         wbits &= ~data[0];
1719         wbits |= data[0] & data[1];
1720         devpriv->do_bits = wbits;
1721
1722         outb(devpriv->do_bits, dev->iobase + DAS1800_DIGITAL);
1723
1724         data[1] = devpriv->do_bits;
1725
1726         return 2;
1727 }
1728
1729 /* loads counters with divisor1, divisor2 from private structure */
1730 static int das1800_set_frequency(struct comedi_device *dev)
1731 {
1732         int err = 0;
1733
1734         /*  counter 1, mode 2 */
1735         if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 1, devpriv->divisor1,
1736                        2))
1737                 err++;
1738         /*  counter 2, mode 2 */
1739         if (i8254_load(dev->iobase + DAS1800_COUNTER, 0, 2, devpriv->divisor2,
1740                        2))
1741                 err++;
1742         if (err)
1743                 return -1;
1744
1745         return 0;
1746 }
1747
1748 /* converts requested conversion timing to timing compatible with
1749  * hardware, used only when card is in 'burst mode'
1750  */
1751 static unsigned int burst_convert_arg(unsigned int convert_arg, int round_mode)
1752 {
1753         unsigned int micro_sec;
1754
1755         /*  in burst mode, the maximum conversion time is 64 microseconds */
1756         if (convert_arg > 64000)
1757                 convert_arg = 64000;
1758
1759         /*  the conversion time must be an integral number of microseconds */
1760         switch (round_mode) {
1761         case TRIG_ROUND_NEAREST:
1762         default:
1763                 micro_sec = (convert_arg + 500) / 1000;
1764                 break;
1765         case TRIG_ROUND_DOWN:
1766                 micro_sec = convert_arg / 1000;
1767                 break;
1768         case TRIG_ROUND_UP:
1769                 micro_sec = (convert_arg - 1) / 1000 + 1;
1770                 break;
1771         }
1772
1773         /*  return number of nanoseconds */
1774         return micro_sec * 1000;
1775 }
1776
1777 /* utility function that suggests a dma transfer size based on the conversion period 'ns' */
1778 static unsigned int suggest_transfer_size(struct comedi_cmd *cmd)
1779 {
1780         unsigned int size = DMA_BUF_SIZE;
1781         static const int sample_size = 2;       /*  size in bytes of one sample from board */
1782         unsigned int fill_time = 300000000;     /*  target time in nanoseconds for filling dma buffer */
1783         unsigned int max_size;  /*  maximum size we will allow for a transfer */
1784
1785         /*  make dma buffer fill in 0.3 seconds for timed modes */
1786         switch (cmd->scan_begin_src) {
1787         case TRIG_FOLLOW:       /*  not in burst mode */
1788                 if (cmd->convert_src == TRIG_TIMER)
1789                         size = (fill_time / cmd->convert_arg) * sample_size;
1790                 break;
1791         case TRIG_TIMER:
1792                 size = (fill_time / (cmd->scan_begin_arg * cmd->chanlist_len)) *
1793                     sample_size;
1794                 break;
1795         default:
1796                 size = DMA_BUF_SIZE;
1797                 break;
1798         }
1799
1800         /*  set a minimum and maximum size allowed */
1801         max_size = DMA_BUF_SIZE;
1802         /*  if we are taking limited number of conversions, limit transfer size to that */
1803         if (cmd->stop_src == TRIG_COUNT &&
1804             cmd->stop_arg * cmd->chanlist_len * sample_size < max_size)
1805                 max_size = cmd->stop_arg * cmd->chanlist_len * sample_size;
1806
1807         if (size > max_size)
1808                 size = max_size;
1809         if (size < sample_size)
1810                 size = sample_size;
1811
1812         return size;
1813 }
1814
1815 MODULE_AUTHOR("Comedi http://www.comedi.org");
1816 MODULE_DESCRIPTION("Comedi low-level driver");
1817 MODULE_LICENSE("GPL");