LXR linux/drivers/staging/comedi/drivers/daqboard2000.c

   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * comedi/drivers/daqboard2000.c
   4 * hardware driver for IOtech DAQboard/2000
   5 *
   6 * COMEDI - Linux Control and Measurement Device Interface
   7 * Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>
   8 */
   9/*
  10 * Driver: daqboard2000
  11 * Description: IOTech DAQBoard/2000
  12 * Author: Anders Blomdell <anders.blomdell@control.lth.se>
  13 * Status: works
  14 * Updated: Mon, 14 Apr 2008 15:28:52 +0100
  15 * Devices: [IOTech] DAQBoard/2000 (daqboard2000)
  16 *
  17 * Much of the functionality of this driver was determined from reading
  18 * the source code for the Windows driver.
  19 *
  20 * The FPGA on the board requires firmware, which is available from
  21 * http://www.comedi.org in the comedi_nonfree_firmware tarball.
  22 *
  23 * Configuration options: not applicable, uses PCI auto config
  24 */
  25/*
  26 * This card was obviously never intended to leave the Windows world,
  27 * since it lacked all kind of hardware documentation (except for cable
  28 * pinouts, plug and pray has something to catch up with yet).
  29 *
  30 * With some help from our swedish distributor, we got the Windows sourcecode
  31 * for the card, and here are the findings so far.
  32 *
  33 * 1. A good document that describes the PCI interface chip is 9080db-106.pdf
  34 *    available from http://www.plxtech.com/products/io/pci9080
  35 *
  36 * 2. The initialization done so far is:
  37 *      a. program the FPGA (windows code sans a lot of error messages)
  38 *      b.
  39 *
  40 * 3. Analog out seems to work OK with DAC's disabled, if DAC's are enabled,
  41 *    you have to output values to all enabled DAC's until result appears, I
  42 *    guess that it has something to do with pacer clocks, but the source
  43 *    gives me no clues. I'll keep it simple so far.
  44 *
  45 * 4. Analog in.
  46 *    Each channel in the scanlist seems to be controlled by four
  47 *    control words:
  48 *
  49 *      Word0:
  50 *        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  51 *        ! | | | ! | | | ! | | | ! | | | !
  52 *        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  53 *
  54 *      Word1:
  55 *        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  56 *        ! | | | ! | | | ! | | | ! | | | !
  57 *        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  58 *         |             |       | | | | |
  59 *         +------+------+       | | | | +-- Digital input (??)
  60 *                |              | | | +---- 10 us settling time
  61 *                |              | | +------ Suspend acquisition (last to scan)
  62 *                |              | +-------- Simultaneous sample and hold
  63 *                |              +---------- Signed data format
  64 *                +------------------------- Correction offset low
  65 *
  66 *      Word2:
  67 *        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  68 *        ! | | | ! | | | ! | | | ! | | | !
  69 *        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  70 *         |     | |     | | | | | |     |
  71 *         +-----+ +--+--+ +++ +++ +--+--+
  72 *            |       |     |   |     +----- Expansion channel
  73 *            |       |     |   +----------- Expansion gain
  74 *            |       |     +--------------- Channel (low)
  75 *            |       +--------------------- Correction offset high
  76 *            +----------------------------- Correction gain low
  77 *      Word3:
  78 *        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  79 *        ! | | | ! | | | ! | | | ! | | | !
  80 *        +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
  81 *         |             | | | |   | | | |
  82 *         +------+------+ | | +-+-+ | | +-- Low bank enable
  83 *                |        | |   |   | +---- High bank enable
  84 *                |        | |   |   +------ Hi/low select
  85 *                |        | |   +---------- Gain (1,?,2,4,8,16,32,64)
  86 *                |        | +-------------- differential/single ended
  87 *                |        +---------------- Unipolar
  88 *                +------------------------- Correction gain high
  89 *
  90 * 999. The card seems to have an incredible amount of capabilities, but
  91 *      trying to reverse engineer them from the Windows source is beyond my
  92 *      patience.
  93 *
  94 */
  95
  96#include <linux/module.h>
  97#include <linux/delay.h>
  98#include <linux/interrupt.h>
  99
 100#include "../comedi_pci.h"
 101
 102#include "8255.h"
 103#include "plx9080.h"
 104
 105#define DB2K_FIRMWARE           "daqboard2000_firmware.bin"
 106
 107static const struct comedi_lrange db2k_ai_range = {
 108        13, {
 109                BIP_RANGE(10),
 110                BIP_RANGE(5),
 111                BIP_RANGE(2.5),
 112                BIP_RANGE(1.25),
 113                BIP_RANGE(0.625),
 114                BIP_RANGE(0.3125),
 115                BIP_RANGE(0.156),
 116                UNI_RANGE(10),
 117                UNI_RANGE(5),
 118                UNI_RANGE(2.5),
 119                UNI_RANGE(1.25),
 120                UNI_RANGE(0.625),
 121                UNI_RANGE(0.3125)
 122        }
 123};
 124
 125/*
 126 * Register Memory Map
 127 */
 128#define DB2K_REG_ACQ_CONTROL                    0x00            /* u16 (w) */
 129#define DB2K_REG_ACQ_STATUS                     0x00            /* u16 (r) */
 130#define DB2K_REG_ACQ_SCAN_LIST_FIFO             0x02            /* u16 */
 131#define DB2K_REG_ACQ_PACER_CLOCK_DIV_LOW        0x04            /* u32 */
 132#define DB2K_REG_ACQ_SCAN_COUNTER               0x08            /* u16 */
 133#define DB2K_REG_ACQ_PACER_CLOCK_DIV_HIGH       0x0a            /* u16 */
 134#define DB2K_REG_ACQ_TRIGGER_COUNT              0x0c            /* u16 */
 135#define DB2K_REG_ACQ_RESULTS_FIFO               0x10            /* u16 */
 136#define DB2K_REG_ACQ_RESULTS_SHADOW             0x14            /* u16 */
 137#define DB2K_REG_ACQ_ADC_RESULT                 0x18            /* u16 */
 138#define DB2K_REG_DAC_SCAN_COUNTER               0x1c            /* u16 */
 139#define DB2K_REG_DAC_CONTROL                    0x20            /* u16 (w) */
 140#define DB2K_REG_DAC_STATUS                     0x20            /* u16 (r) */
 141#define DB2K_REG_DAC_FIFO                       0x24            /* s16 */
 142#define DB2K_REG_DAC_PACER_CLOCK_DIV            0x2a            /* u16 */
 143#define DB2K_REG_REF_DACS                       0x2c            /* u16 */
 144#define DB2K_REG_DIO_CONTROL                    0x30            /* u16 */
 145#define DB2K_REG_P3_HSIO_DATA                   0x32            /* s16 */
 146#define DB2K_REG_P3_CONTROL                     0x34            /* u16 */
 147#define DB2K_REG_CAL_EEPROM_CONTROL             0x36            /* u16 */
 148#define DB2K_REG_DAC_SETTING(x)                 (0x38 + (x) * 2) /* s16 */
 149#define DB2K_REG_DIO_P2_EXP_IO_8_BIT            0x40            /* s16 */
 150#define DB2K_REG_COUNTER_TIMER_CONTROL          0x80            /* u16 */
 151#define DB2K_REG_COUNTER_INPUT(x)               (0x88 + (x) * 2) /* s16 */
 152#define DB2K_REG_TIMER_DIV(x)                   (0xa0 + (x) * 2) /* u16 */
 153#define DB2K_REG_DMA_CONTROL                    0xb0            /* u16 */
 154#define DB2K_REG_TRIG_CONTROL                   0xb2            /* u16 */
 155#define DB2K_REG_CAL_EEPROM                     0xb8            /* u16 */
 156#define DB2K_REG_ACQ_DIGITAL_MARK               0xba            /* u16 */
 157#define DB2K_REG_TRIG_DACS                      0xbc            /* u16 */
 158#define DB2K_REG_DIO_P2_EXP_IO_16_BIT(x)        (0xc0 + (x) * 2) /* s16 */
 159
 160/* CPLD registers */
 161#define DB2K_REG_CPLD_STATUS                    0x1000          /* u16 (r) */
 162#define DB2K_REG_CPLD_WDATA                     0x1000          /* u16 (w) */
 163
 164/* Scan Sequencer programming */
 165#define DB2K_ACQ_CONTROL_SEQ_START_SCAN_LIST            0x0011
 166#define DB2K_ACQ_CONTROL_SEQ_STOP_SCAN_LIST             0x0010
 167
 168/* Prepare for acquisition */
 169#define DB2K_ACQ_CONTROL_RESET_SCAN_LIST_FIFO           0x0004
 170#define DB2K_ACQ_CONTROL_RESET_RESULTS_FIFO             0x0002
 171#define DB2K_ACQ_CONTROL_RESET_CONFIG_PIPE              0x0001
 172
 173/* Pacer Clock Control */
 174#define DB2K_ACQ_CONTROL_ADC_PACER_INTERNAL             0x0030
 175#define DB2K_ACQ_CONTROL_ADC_PACER_EXTERNAL             0x0032
 176#define DB2K_ACQ_CONTROL_ADC_PACER_ENABLE               0x0031
 177#define DB2K_ACQ_CONTROL_ADC_PACER_ENABLE_DAC_PACER     0x0034
 178#define DB2K_ACQ_CONTROL_ADC_PACER_DISABLE              0x0030
 179#define DB2K_ACQ_CONTROL_ADC_PACER_NORMAL_MODE          0x0060
 180#define DB2K_ACQ_CONTROL_ADC_PACER_COMPATIBILITY_MODE   0x0061
 181#define DB2K_ACQ_CONTROL_ADC_PACER_INTERNAL_OUT_ENABLE  0x0008
 182#define DB2K_ACQ_CONTROL_ADC_PACER_EXTERNAL_RISING      0x0100
 183
 184/* Acquisition status bits */
 185#define DB2K_ACQ_STATUS_RESULTS_FIFO_MORE_1_SAMPLE      0x0001
 186#define DB2K_ACQ_STATUS_RESULTS_FIFO_HAS_DATA           0x0002
 187#define DB2K_ACQ_STATUS_RESULTS_FIFO_OVERRUN            0x0004
 188#define DB2K_ACQ_STATUS_LOGIC_SCANNING                  0x0008
 189#define DB2K_ACQ_STATUS_CONFIG_PIPE_FULL                0x0010
 190#define DB2K_ACQ_STATUS_SCAN_LIST_FIFO_EMPTY            0x0020
 191#define DB2K_ACQ_STATUS_ADC_NOT_READY                   0x0040
 192#define DB2K_ACQ_STATUS_ARBITRATION_FAILURE             0x0080
 193#define DB2K_ACQ_STATUS_ADC_PACER_OVERRUN               0x0100
 194#define DB2K_ACQ_STATUS_DAC_PACER_OVERRUN               0x0200
 195
 196/* DAC status */
 197#define DB2K_DAC_STATUS_DAC_FULL                        0x0001
 198#define DB2K_DAC_STATUS_REF_BUSY                        0x0002
 199#define DB2K_DAC_STATUS_TRIG_BUSY                       0x0004
 200#define DB2K_DAC_STATUS_CAL_BUSY                        0x0008
 201#define DB2K_DAC_STATUS_DAC_BUSY(x)                     (0x0010 << (x))
 202
 203/* DAC control */
 204#define DB2K_DAC_CONTROL_ENABLE_BIT                     0x0001
 205#define DB2K_DAC_CONTROL_DATA_IS_SIGNED                 0x0002
 206#define DB2K_DAC_CONTROL_RESET_FIFO                     0x0004
 207#define DB2K_DAC_CONTROL_DAC_DISABLE(x)                 (0x0020 + ((x) << 4))
 208#define DB2K_DAC_CONTROL_DAC_ENABLE(x)                  (0x0021 + ((x) << 4))
 209#define DB2K_DAC_CONTROL_PATTERN_DISABLE                0x0060
 210#define DB2K_DAC_CONTROL_PATTERN_ENABLE                 0x0061
 211
 212/* Trigger Control */
 213#define DB2K_TRIG_CONTROL_TYPE_ANALOG                   0x0000
 214#define DB2K_TRIG_CONTROL_TYPE_TTL                      0x0010
 215#define DB2K_TRIG_CONTROL_EDGE_HI_LO                    0x0004
 216#define DB2K_TRIG_CONTROL_EDGE_LO_HI                    0x0000
 217#define DB2K_TRIG_CONTROL_LEVEL_ABOVE                   0x0000
 218#define DB2K_TRIG_CONTROL_LEVEL_BELOW                   0x0004
 219#define DB2K_TRIG_CONTROL_SENSE_LEVEL                   0x0002
 220#define DB2K_TRIG_CONTROL_SENSE_EDGE                    0x0000
 221#define DB2K_TRIG_CONTROL_ENABLE                        0x0001
 222#define DB2K_TRIG_CONTROL_DISABLE                       0x0000
 223
 224/* Reference Dac Selection */
 225#define DB2K_REF_DACS_SET                               0x0080
 226#define DB2K_REF_DACS_SELECT_POS_REF                    0x0100
 227#define DB2K_REF_DACS_SELECT_NEG_REF                    0x0000
 228
 229/* CPLD status bits */
 230#define DB2K_CPLD_STATUS_INIT                           0x0002
 231#define DB2K_CPLD_STATUS_TXREADY                        0x0004
 232#define DB2K_CPLD_VERSION_MASK                          0xf000
 233/* "New CPLD" signature. */
 234#define DB2K_CPLD_VERSION_NEW                           0x5000
 235
 236enum db2k_boardid {
 237        BOARD_DAQBOARD2000,
 238        BOARD_DAQBOARD2001
 239};
 240
 241struct db2k_boardtype {
 242        const char *name;
 243        bool has_2_ao:1;        /* false: 4 AO chans; true: 2 AO chans */
 244};
 245
 246static const struct db2k_boardtype db2k_boardtypes[] = {
 247        [BOARD_DAQBOARD2000] = {
 248                .name           = "daqboard2000",
 249                .has_2_ao       = true,
 250        },
 251        [BOARD_DAQBOARD2001] = {
 252                .name           = "daqboard2001",
 253        },
 254};
 255
 256struct db2k_private {
 257        void __iomem *plx;
 258};
 259
 260static void db2k_write_acq_scan_list_entry(struct comedi_device *dev, u16 entry)
 261{
 262        writew(entry & 0x00ff, dev->mmio + DB2K_REG_ACQ_SCAN_LIST_FIFO);
 263        writew((entry >> 8) & 0x00ff,
 264               dev->mmio + DB2K_REG_ACQ_SCAN_LIST_FIFO);
 265}
 266
 267static void db2k_setup_sampling(struct comedi_device *dev, int chan, int gain)
 268{
 269        u16 word0, word1, word2, word3;
 270
 271        /* Channel 0-7 diff, channel 8-23 single ended */
 272        word0 = 0;
 273        word1 = 0x0004;         /* Last scan */
 274        word2 = (chan << 6) & 0x00c0;
 275        switch (chan / 4) {
 276        case 0:
 277                word3 = 0x0001;
 278                break;
 279        case 1:
 280                word3 = 0x0002;
 281                break;
 282        case 2:
 283                word3 = 0x0005;
 284                break;
 285        case 3:
 286                word3 = 0x0006;
 287                break;
 288        case 4:
 289                word3 = 0x0041;
 290                break;
 291        case 5:
 292                word3 = 0x0042;
 293                break;
 294        default:
 295                word3 = 0;
 296                break;
 297        }
 298        /* These should be read from EEPROM */
 299        word2 |= 0x0800;        /* offset */
 300        word3 |= 0xc000;        /* gain */
 301        db2k_write_acq_scan_list_entry(dev, word0);
 302        db2k_write_acq_scan_list_entry(dev, word1);
 303        db2k_write_acq_scan_list_entry(dev, word2);
 304        db2k_write_acq_scan_list_entry(dev, word3);
 305}
 306
 307static int db2k_ai_status(struct comedi_device *dev, struct comedi_subdevice *s,
 308                          struct comedi_insn *insn, unsigned long context)
 309{
 310        unsigned int status;
 311
 312        status = readw(dev->mmio + DB2K_REG_ACQ_STATUS);
 313        if (status & context)
 314                return 0;
 315        return -EBUSY;
 316}
 317
 318static int db2k_ai_insn_read(struct comedi_device *dev,
 319                             struct comedi_subdevice *s,
 320                             struct comedi_insn *insn, unsigned int *data)
 321{
 322        int gain, chan;
 323        int ret;
 324        int i;
 325
 326        writew(DB2K_ACQ_CONTROL_RESET_SCAN_LIST_FIFO |
 327               DB2K_ACQ_CONTROL_RESET_RESULTS_FIFO |
 328               DB2K_ACQ_CONTROL_RESET_CONFIG_PIPE,
 329               dev->mmio + DB2K_REG_ACQ_CONTROL);
 330
 331        /*
 332         * If pacer clock is not set to some high value (> 10 us), we
 333         * risk multiple samples to be put into the result FIFO.
 334         */
 335        /* 1 second, should be long enough */
 336        writel(1000000, dev->mmio + DB2K_REG_ACQ_PACER_CLOCK_DIV_LOW);
 337        writew(0, dev->mmio + DB2K_REG_ACQ_PACER_CLOCK_DIV_HIGH);
 338
 339        gain = CR_RANGE(insn->chanspec);
 340        chan = CR_CHAN(insn->chanspec);
 341
 342        /*
 343         * This doesn't look efficient.  I decided to take the conservative
 344         * approach when I did the insn conversion.  Perhaps it would be
 345         * better to have broken it completely, then someone would have been
 346         * forced to fix it.  --ds
 347         */
 348        for (i = 0; i < insn->n; i++) {
 349                db2k_setup_sampling(dev, chan, gain);
 350                /* Enable reading from the scanlist FIFO */
 351                writew(DB2K_ACQ_CONTROL_SEQ_START_SCAN_LIST,
 352                       dev->mmio + DB2K_REG_ACQ_CONTROL);
 353
 354                ret = comedi_timeout(dev, s, insn, db2k_ai_status,
 355                                     DB2K_ACQ_STATUS_CONFIG_PIPE_FULL);
 356                if (ret)
 357                        return ret;
 358
 359                writew(DB2K_ACQ_CONTROL_ADC_PACER_ENABLE,
 360                       dev->mmio + DB2K_REG_ACQ_CONTROL);
 361
 362                ret = comedi_timeout(dev, s, insn, db2k_ai_status,
 363                                     DB2K_ACQ_STATUS_LOGIC_SCANNING);
 364                if (ret)
 365                        return ret;
 366
 367                ret =
 368                comedi_timeout(dev, s, insn, db2k_ai_status,
 369                               DB2K_ACQ_STATUS_RESULTS_FIFO_HAS_DATA);
 370                if (ret)
 371                        return ret;
 372
 373                data[i] = readw(dev->mmio + DB2K_REG_ACQ_RESULTS_FIFO);
 374                writew(DB2K_ACQ_CONTROL_ADC_PACER_DISABLE,
 375                       dev->mmio + DB2K_REG_ACQ_CONTROL);
 376                writew(DB2K_ACQ_CONTROL_SEQ_STOP_SCAN_LIST,
 377                       dev->mmio + DB2K_REG_ACQ_CONTROL);
 378        }
 379
 380        return i;
 381}
 382
 383static int db2k_ao_eoc(struct comedi_device *dev, struct comedi_subdevice *s,
 384                       struct comedi_insn *insn, unsigned long context)
 385{
 386        unsigned int chan = CR_CHAN(insn->chanspec);
 387        unsigned int status;
 388
 389        status = readw(dev->mmio + DB2K_REG_DAC_STATUS);
 390        if ((status & DB2K_DAC_STATUS_DAC_BUSY(chan)) == 0)
 391                return 0;
 392        return -EBUSY;
 393}
 394
 395static int db2k_ao_insn_write(struct comedi_device *dev,
 396                              struct comedi_subdevice *s,
 397                              struct comedi_insn *insn, unsigned int *data)
 398{
 399        unsigned int chan = CR_CHAN(insn->chanspec);
 400        int i;
 401
 402        for (i = 0; i < insn->n; i++) {
 403                unsigned int val = data[i];
 404                int ret;
 405
 406                writew(val, dev->mmio + DB2K_REG_DAC_SETTING(chan));
 407
 408                ret = comedi_timeout(dev, s, insn, db2k_ao_eoc, 0);
 409                if (ret)
 410                        return ret;
 411
 412                s->readback[chan] = val;
 413        }
 414
 415        return insn->n;
 416}
 417
 418static void db2k_reset_local_bus(struct comedi_device *dev)
 419{
 420        struct db2k_private *devpriv = dev->private;
 421        u32 cntrl;
 422
 423        cntrl = readl(devpriv->plx + PLX_REG_CNTRL);
 424        cntrl |= PLX_CNTRL_RESET;
 425        writel(cntrl, devpriv->plx + PLX_REG_CNTRL);
 426        mdelay(10);
 427        cntrl &= ~PLX_CNTRL_RESET;
 428        writel(cntrl, devpriv->plx + PLX_REG_CNTRL);
 429        mdelay(10);
 430}
 431
 432static void db2k_reload_plx(struct comedi_device *dev)
 433{
 434        struct db2k_private *devpriv = dev->private;
 435        u32 cntrl;
 436
 437        cntrl = readl(devpriv->plx + PLX_REG_CNTRL);
 438        cntrl &= ~PLX_CNTRL_EERELOAD;
 439        writel(cntrl, devpriv->plx + PLX_REG_CNTRL);
 440        mdelay(10);
 441        cntrl |= PLX_CNTRL_EERELOAD;
 442        writel(cntrl, devpriv->plx + PLX_REG_CNTRL);
 443        mdelay(10);
 444        cntrl &= ~PLX_CNTRL_EERELOAD;
 445        writel(cntrl, devpriv->plx + PLX_REG_CNTRL);
 446        mdelay(10);
 447}
 448
 449static void db2k_pulse_prog_pin(struct comedi_device *dev)
 450{
 451        struct db2k_private *devpriv = dev->private;
 452        u32 cntrl;
 453
 454        cntrl = readl(devpriv->plx + PLX_REG_CNTRL);
 455        cntrl |= PLX_CNTRL_USERO;
 456        writel(cntrl, devpriv->plx + PLX_REG_CNTRL);
 457        mdelay(10);
 458        cntrl &= ~PLX_CNTRL_USERO;
 459        writel(cntrl, devpriv->plx + PLX_REG_CNTRL);
 460        mdelay(10);     /* Not in the original code, but I like symmetry... */
 461}
 462
 463static int db2k_wait_cpld_init(struct comedi_device *dev)
 464{
 465        int result = -ETIMEDOUT;
 466        int i;
 467        u16 cpld;
 468
 469        /* timeout after 50 tries -> 5ms */
 470        for (i = 0; i < 50; i++) {
 471                cpld = readw(dev->mmio + DB2K_REG_CPLD_STATUS);
 472                if (cpld & DB2K_CPLD_STATUS_INIT) {
 473                        result = 0;
 474                        break;
 475                }
 476                usleep_range(100, 1000);
 477        }
 478        udelay(5);
 479        return result;
 480}
 481
 482static int db2k_wait_cpld_txready(struct comedi_device *dev)
 483{
 484        int i;
 485
 486        for (i = 0; i < 100; i++) {
 487                if (readw(dev->mmio + DB2K_REG_CPLD_STATUS) &
 488                    DB2K_CPLD_STATUS_TXREADY) {
 489                        return 0;
 490                }
 491                udelay(1);
 492        }
 493        return -ETIMEDOUT;
 494}
 495
 496static int db2k_write_cpld(struct comedi_device *dev, u16 data, bool new_cpld)
 497{
 498        int result = 0;
 499
 500        if (new_cpld) {
 501                result = db2k_wait_cpld_txready(dev);
 502                if (result)
 503                        return result;
 504        } else {
 505                usleep_range(10, 20);
 506        }
 507        writew(data, dev->mmio + DB2K_REG_CPLD_WDATA);
 508        if (!(readw(dev->mmio + DB2K_REG_CPLD_STATUS) & DB2K_CPLD_STATUS_INIT))
 509                result = -EIO;
 510
 511        return result;
 512}
 513
 514static int db2k_wait_fpga_programmed(struct comedi_device *dev)
 515{
 516        struct db2k_private *devpriv = dev->private;
 517        int i;
 518
 519        /* Time out after 200 tries -> 20ms */
 520        for (i = 0; i < 200; i++) {
 521                u32 cntrl = readl(devpriv->plx + PLX_REG_CNTRL);
 522                /* General Purpose Input (USERI) set on FPGA "DONE". */
 523                if (cntrl & PLX_CNTRL_USERI)
 524                        return 0;
 525
 526                usleep_range(100, 1000);
 527        }
 528        return -ETIMEDOUT;
 529}
 530
 531static int db2k_load_firmware(struct comedi_device *dev, const u8 *cpld_array,
 532                              size_t len, unsigned long context)
 533{
 534        struct db2k_private *devpriv = dev->private;
 535        int result = -EIO;
 536        u32 cntrl;
 537        int retry;
 538        size_t i;
 539        bool new_cpld;
 540
 541        /* Look for FPGA start sequence in firmware. */
 542        for (i = 0; i + 1 < len; i++) {
 543                if (cpld_array[i] == 0xff && cpld_array[i + 1] == 0x20)
 544                        break;
 545        }
 546        if (i + 1 >= len) {
 547                dev_err(dev->class_dev, "bad firmware - no start sequence\n");
 548                return -EINVAL;
 549        }
 550        /* Check length is even. */
 551        if ((len - i) & 1) {
 552                dev_err(dev->class_dev,
 553                        "bad firmware - odd length (%zu = %zu - %zu)\n",
 554                        len - i, len, i);
 555                return -EINVAL;
 556        }
 557        /* Strip firmware header. */
 558        cpld_array += i;
 559        len -= i;
 560
 561        /* Check to make sure the serial eeprom is present on the board */
 562        cntrl = readl(devpriv->plx + PLX_REG_CNTRL);
 563        if (!(cntrl & PLX_CNTRL_EEPRESENT))
 564                return -EIO;
 565
 566        for (retry = 0; retry < 3; retry++) {
 567                db2k_reset_local_bus(dev);
 568                db2k_reload_plx(dev);
 569                db2k_pulse_prog_pin(dev);
 570                result = db2k_wait_cpld_init(dev);
 571                if (result)
 572                        continue;
 573
 574                new_cpld = (readw(dev->mmio + DB2K_REG_CPLD_STATUS) &
 575                            DB2K_CPLD_VERSION_MASK) == DB2K_CPLD_VERSION_NEW;
 576                for (; i < len; i += 2) {
 577                        u16 data = (cpld_array[i] << 8) + cpld_array[i + 1];
 578
 579                        result = db2k_write_cpld(dev, data, new_cpld);
 580                        if (result)
 581                                break;
 582                }
 583                if (result == 0)
 584                        result = db2k_wait_fpga_programmed(dev);
 585                if (result == 0) {
 586                        db2k_reset_local_bus(dev);
 587                        db2k_reload_plx(dev);
 588                        break;
 589                }
 590        }
 591        return result;
 592}
 593
 594static void db2k_adc_stop_dma_transfer(struct comedi_device *dev)
 595{
 596}
 597
 598static void db2k_adc_disarm(struct comedi_device *dev)
 599{
 600        /* Disable hardware triggers */
 601        udelay(2);
 602        writew(DB2K_TRIG_CONTROL_TYPE_ANALOG | DB2K_TRIG_CONTROL_DISABLE,
 603               dev->mmio + DB2K_REG_TRIG_CONTROL);
 604        udelay(2);
 605        writew(DB2K_TRIG_CONTROL_TYPE_TTL | DB2K_TRIG_CONTROL_DISABLE,
 606               dev->mmio + DB2K_REG_TRIG_CONTROL);
 607
 608        /* Stop the scan list FIFO from loading the configuration pipe */
 609        udelay(2);
 610        writew(DB2K_ACQ_CONTROL_SEQ_STOP_SCAN_LIST,
 611               dev->mmio + DB2K_REG_ACQ_CONTROL);
 612
 613        /* Stop the pacer clock */
 614        udelay(2);
 615        writew(DB2K_ACQ_CONTROL_ADC_PACER_DISABLE,
 616               dev->mmio + DB2K_REG_ACQ_CONTROL);
 617
 618        /* Stop the input dma (abort channel 1) */
 619        db2k_adc_stop_dma_transfer(dev);
 620}
 621
 622static void db2k_activate_reference_dacs(struct comedi_device *dev)
 623{
 624        unsigned int val;
 625        int timeout;
 626
 627        /*  Set the + reference dac value in the FPGA */
 628        writew(DB2K_REF_DACS_SET | DB2K_REF_DACS_SELECT_POS_REF,
 629               dev->mmio + DB2K_REG_REF_DACS);
 630        for (timeout = 0; timeout < 20; timeout++) {
 631                val = readw(dev->mmio + DB2K_REG_DAC_STATUS);
 632                if ((val & DB2K_DAC_STATUS_REF_BUSY) == 0)
 633                        break;
 634                udelay(2);
 635        }
 636
 637        /*  Set the - reference dac value in the FPGA */
 638        writew(DB2K_REF_DACS_SET | DB2K_REF_DACS_SELECT_NEG_REF,
 639               dev->mmio + DB2K_REG_REF_DACS);
 640        for (timeout = 0; timeout < 20; timeout++) {
 641                val = readw(dev->mmio + DB2K_REG_DAC_STATUS);
 642                if ((val & DB2K_DAC_STATUS_REF_BUSY) == 0)
 643                        break;
 644                udelay(2);
 645        }
 646}
 647
 648static void db2k_initialize_ctrs(struct comedi_device *dev)
 649{
 650}
 651
 652static void db2k_initialize_tmrs(struct comedi_device *dev)
 653{
 654}
 655
 656static void db2k_dac_disarm(struct comedi_device *dev)
 657{
 658}
 659
 660static void db2k_initialize_adc(struct comedi_device *dev)
 661{
 662        db2k_adc_disarm(dev);
 663        db2k_activate_reference_dacs(dev);
 664        db2k_initialize_ctrs(dev);
 665        db2k_initialize_tmrs(dev);
 666}
 667
 668static void db2k_initialize_dac(struct comedi_device *dev)
 669{
 670        db2k_dac_disarm(dev);
 671}
 672
 673static int db2k_8255_cb(struct comedi_device *dev, int dir, int port, int data,
 674                        unsigned long iobase)
 675{
 676        if (dir) {
 677                writew(data, dev->mmio + iobase + port * 2);
 678                return 0;
 679        }
 680        return readw(dev->mmio + iobase + port * 2);
 681}
 682
 683static int db2k_auto_attach(struct comedi_device *dev, unsigned long context)
 684{
 685        struct pci_dev *pcidev = comedi_to_pci_dev(dev);
 686        const struct db2k_boardtype *board;
 687        struct db2k_private *devpriv;
 688        struct comedi_subdevice *s;
 689        int result;
 690
 691        if (context >= ARRAY_SIZE(db2k_boardtypes))
 692                return -ENODEV;
 693        board = &db2k_boardtypes[context];
 694        if (!board->name)
 695                return -ENODEV;
 696        dev->board_ptr = board;
 697        dev->board_name = board->name;
 698
 699        devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
 700        if (!devpriv)
 701                return -ENOMEM;
 702
 703        result = comedi_pci_enable(dev);
 704        if (result)
 705                return result;
 706
 707        devpriv->plx = pci_ioremap_bar(pcidev, 0);
 708        dev->mmio = pci_ioremap_bar(pcidev, 2);
 709        if (!devpriv->plx || !dev->mmio)
 710                return -ENOMEM;
 711
 712        result = comedi_alloc_subdevices(dev, 3);
 713        if (result)
 714                return result;
 715
 716        result = comedi_load_firmware(dev, &comedi_to_pci_dev(dev)->dev,
 717                                      DB2K_FIRMWARE, db2k_load_firmware, 0);
 718        if (result < 0)
 719                return result;
 720
 721        db2k_initialize_adc(dev);
 722        db2k_initialize_dac(dev);
 723
 724        s = &dev->subdevices[0];
 725        /* ai subdevice */
 726        s->type = COMEDI_SUBD_AI;
 727        s->subdev_flags = SDF_READABLE | SDF_GROUND;
 728        s->n_chan = 24;
 729        s->maxdata = 0xffff;
 730        s->insn_read = db2k_ai_insn_read;
 731        s->range_table = &db2k_ai_range;
 732
 733        s = &dev->subdevices[1];
 734        /* ao subdevice */
 735        s->type = COMEDI_SUBD_AO;
 736        s->subdev_flags = SDF_WRITABLE;
 737        s->n_chan = board->has_2_ao ? 2 : 4;
 738        s->maxdata = 0xffff;
 739        s->insn_write = db2k_ao_insn_write;
 740        s->range_table = &range_bipolar10;
 741
 742        result = comedi_alloc_subdev_readback(s);
 743        if (result)
 744                return result;
 745
 746        s = &dev->subdevices[2];
 747        return subdev_8255_init(dev, s, db2k_8255_cb,
 748                                DB2K_REG_DIO_P2_EXP_IO_8_BIT);
 749}
 750
 751static void db2k_detach(struct comedi_device *dev)
 752{
 753        struct db2k_private *devpriv = dev->private;
 754
 755        if (devpriv && devpriv->plx)
 756                iounmap(devpriv->plx);
 757        comedi_pci_detach(dev);
 758}
 759
 760static struct comedi_driver db2k_driver = {
 761        .driver_name    = "daqboard2000",
 762        .module         = THIS_MODULE,
 763        .auto_attach    = db2k_auto_attach,
 764        .detach         = db2k_detach,
 765};
 766
 767static int db2k_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 768{
 769        return comedi_pci_auto_config(dev, &db2k_driver, id->driver_data);
 770}
 771
 772static const struct pci_device_id db2k_pci_table[] = {
 773        { PCI_DEVICE_SUB(PCI_VENDOR_ID_IOTECH, 0x0409, PCI_VENDOR_ID_IOTECH,
 774                         0x0002), .driver_data = BOARD_DAQBOARD2000, },
 775        { PCI_DEVICE_SUB(PCI_VENDOR_ID_IOTECH, 0x0409, PCI_VENDOR_ID_IOTECH,
 776                         0x0004), .driver_data = BOARD_DAQBOARD2001, },
 777        { 0 }
 778};
 779MODULE_DEVICE_TABLE(pci, db2k_pci_table);
 780
 781static struct pci_driver db2k_pci_driver = {
 782        .name           = "daqboard2000",
 783        .id_table       = db2k_pci_table,
 784        .probe          = db2k_pci_probe,
 785        .remove         = comedi_pci_auto_unconfig,
 786};
 787module_comedi_pci_driver(db2k_driver, db2k_pci_driver);
 788
 789MODULE_AUTHOR("Comedi http://www.comedi.org");
 790MODULE_DESCRIPTION("Comedi low-level driver");
 791MODULE_LICENSE("GPL");
 792MODULE_FIRMWARE(DB2K_FIRMWARE);
 793