/*
   comedi/drivers/daqboard2000.c
   hardware driver for IOtech DAQboard/2000

   COMEDI - Linux Control and Measurement Device Interface
   Copyright (C) 1999 Anders Blomdell <anders.blomdell@control.lth.se>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */
/*
Driver: daqboard2000
Description: IOTech DAQBoard/2000
Author: Anders Blomdell <anders.blomdell@control.lth.se>
Status: works
Updated: Mon, 14 Apr 2008 15:28:52 +0100
Devices: [IOTech] DAQBoard/2000 (daqboard2000)

Much of the functionality of this driver was determined from reading
the source code for the Windows driver.

The FPGA on the board requires initialization code, which can
be loaded by comedi_config using the -i
option.  The initialization code is available from http://www.comedi.org
in the comedi_nonfree_firmware tarball.

Configuration options:
  [0] - PCI bus of device (optional)
  [1] - PCI slot of device (optional)
  If bus/slot is not specified, the first supported
  PCI device found will be used.
*/
/*
   This card was obviously never intended to leave the Windows world,
   since it lacked all kind of hardware documentation (except for cable
   pinouts, plug and pray has something to catch up with yet).

   With some help from our swedish distributor, we got the Windows sourcecode
   for the card, and here are the findings so far.

   1. A good document that describes the PCI interface chip is 9080db-106.pdf
      available from http://www.plxtech.com/products/io/pci9080 

   2. The initialization done so far is:
        a. program the FPGA (windows code sans a lot of error messages)
	b.

   3. Analog out seems to work OK with DAC's disabled, if DAC's are enabled,
      you have to output values to all enabled DAC's until result appears, I
      guess that it has something to do with pacer clocks, but the source
      gives me no clues. I'll keep it simple so far.

   4. Analog in.
        Each channel in the scanlist seems to be controlled by four
	control words:

        Word0:
          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
          ! | | | ! | | | ! | | | ! | | | !
          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

        Word1:
          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
          ! | | | ! | | | ! | | | ! | | | !
          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	   |             |       | | | | |
           +------+------+       | | | | +-- Digital input (??)
		  |		 | | | +---- 10 us settling time
		  |		 | | +------ Suspend acquisition (last to scan)
		  |		 | +-------- Simultaneous sample and hold
		  |		 +---------- Signed data format
		  +------------------------- Correction offset low

        Word2:
          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
          ! | | | ! | | | ! | | | ! | | | !
          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           |     | |     | | | | | |     |
           +-----+ +--+--+ +++ +++ +--+--+
              |       |     |   |     +----- Expansion channel
	      |       |     |   +----------- Expansion gain
              |       |     +--------------- Channel (low)
	      |       +--------------------- Correction offset high
	      +----------------------------- Correction gain low
        Word3:
          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
          ! | | | ! | | | ! | | | ! | | | !
          +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
           |             | | | |   | | | |
           +------+------+ | | +-+-+ | | +-- Low bank enable
                  |        | |   |   | +---- High bank enable
                  |        | |   |   +------ Hi/low select
		  |    	   | |   +---------- Gain (1,?,2,4,8,16,32,64)
		  |    	   | +-------------- differential/single ended
		  |    	   +---------------- Unipolar
		  +------------------------- Correction gain high

   999. The card seems to have an incredible amount of capabilities, but
        trying to reverse engineer them from the Windows source is beyond my
	patience.

 */

#include "../comedidev.h"

#include <linux/delay.h>
#include <linux/interrupt.h>

#include "comedi_pci.h"
#include "8255.h"

#define DAQBOARD2000_SUBSYSTEM_IDS2 	0x00021616	/* Daqboard/2000 - 2 Dacs */
#define DAQBOARD2000_SUBSYSTEM_IDS4 	0x00041616	/* Daqboard/2000 - 4 Dacs */

#define DAQBOARD2000_DAQ_SIZE 		0x1002
#define DAQBOARD2000_PLX_SIZE 		0x100

/* Initialization bits for the Serial EEPROM Control Register */
#define DAQBOARD2000_SECRProgPinHi      0x8001767e
#define DAQBOARD2000_SECRProgPinLo      0x8000767e
#define DAQBOARD2000_SECRLocalBusHi     0xc000767e
#define DAQBOARD2000_SECRLocalBusLo     0x8000767e
#define DAQBOARD2000_SECRReloadHi       0xa000767e
#define DAQBOARD2000_SECRReloadLo       0x8000767e

/* SECR status bits */
#define DAQBOARD2000_EEPROM_PRESENT     0x10000000

/* CPLD status bits */
#define DAQBOARD2000_CPLD_INIT 		0x0002
#define DAQBOARD2000_CPLD_DONE 		0x0004

/* Available ranges */
static const struct comedi_lrange range_daqboard2000_ai = { 13, {
								 RANGE(-10, 10),
								 RANGE(-5, 5),
								 RANGE(-2.5,
								       2.5),
								 RANGE(-1.25,
								       1.25),
								 RANGE(-0.625,
								       0.625),
								 RANGE(-0.3125,
								       0.3125),
								 RANGE(-0.156,
								       0.156),
								 RANGE(0, 10),
								 RANGE(0, 5),
								 RANGE(0, 2.5),
								 RANGE(0, 1.25),
								 RANGE(0,
								       0.625),
								 RANGE(0,
								       0.3125)
								 }
};

static const struct comedi_lrange range_daqboard2000_ao = { 1, {
								RANGE(-10, 10)
								}
};

struct daqboard2000_hw {
	volatile u16 acqControl;	/*  0x00 */
	volatile u16 acqScanListFIFO;	/*  0x02 */
	volatile u32 acqPacerClockDivLow;	/*  0x04 */

	volatile u16 acqScanCounter;	/*  0x08 */
	volatile u16 acqPacerClockDivHigh;	/*  0x0a */
	volatile u16 acqTriggerCount;	/*  0x0c */
	volatile u16 fill2;	/*  0x0e */
	volatile u16 acqResultsFIFO;	/*  0x10 */
	volatile u16 fill3;	/*  0x12 */
	volatile u16 acqResultsShadow;	/*  0x14 */
	volatile u16 fill4;	/*  0x16 */
	volatile u16 acqAdcResult;	/*  0x18 */
	volatile u16 fill5;	/*  0x1a */
	volatile u16 dacScanCounter;	/*  0x1c */
	volatile u16 fill6;	/*  0x1e */

	volatile u16 dacControl;	/*  0x20 */
	volatile u16 fill7;	/*  0x22 */
	volatile s16 dacFIFO;	/*  0x24 */
	volatile u16 fill8[2];	/*  0x26 */
	volatile u16 dacPacerClockDiv;	/*  0x2a */
	volatile u16 refDacs;	/*  0x2c */
	volatile u16 fill9;	/*  0x2e */

	volatile u16 dioControl;	/*  0x30 */
	volatile s16 dioP3hsioData;	/*  0x32 */
	volatile u16 dioP3Control;	/*  0x34 */
	volatile u16 calEepromControl;	/*  0x36 */
	volatile s16 dacSetting[4];	/*  0x38 */
	volatile s16 dioP2ExpansionIO8Bit[32];	/*  0x40 */

	volatile u16 ctrTmrControl;	/*  0x80 */
	volatile u16 fill10[3];	/*  0x82 */
	volatile s16 ctrInput[4];	/*  0x88 */
	volatile u16 fill11[8];	/*  0x90 */
	volatile u16 timerDivisor[2];	/*  0xa0 */
	volatile u16 fill12[6];	/*  0xa4 */

	volatile u16 dmaControl;	/*  0xb0 */
	volatile u16 trigControl;	/*  0xb2 */
	volatile u16 fill13[2];	/*  0xb4 */
	volatile u16 calEeprom;	/*  0xb8 */
	volatile u16 acqDigitalMark;	/*  0xba */
	volatile u16 trigDacs;	/*  0xbc */
	volatile u16 fill14;	/*  0xbe */
	volatile s16 dioP2ExpansionIO16Bit[32];	/*  0xc0 */
};

/* Scan Sequencer programming */
#define DAQBOARD2000_SeqStartScanList            0x0011
#define DAQBOARD2000_SeqStopScanList             0x0010

/* Prepare for acquisition */
#define DAQBOARD2000_AcqResetScanListFifo        0x0004
#define DAQBOARD2000_AcqResetResultsFifo         0x0002
#define DAQBOARD2000_AcqResetConfigPipe          0x0001

/* Acqusition status bits */
#define DAQBOARD2000_AcqResultsFIFOMore1Sample   0x0001
#define DAQBOARD2000_AcqResultsFIFOHasValidData  0x0002
#define DAQBOARD2000_AcqResultsFIFOOverrun       0x0004
#define DAQBOARD2000_AcqLogicScanning            0x0008
#define DAQBOARD2000_AcqConfigPipeFull           0x0010
#define DAQBOARD2000_AcqScanListFIFOEmpty        0x0020
#define DAQBOARD2000_AcqAdcNotReady              0x0040
#define DAQBOARD2000_ArbitrationFailure          0x0080
#define DAQBOARD2000_AcqPacerOverrun             0x0100
#define DAQBOARD2000_DacPacerOverrun             0x0200
#define DAQBOARD2000_AcqHardwareError            0x01c0

/* Scan Sequencer programming */
#define DAQBOARD2000_SeqStartScanList            0x0011
#define DAQBOARD2000_SeqStopScanList             0x0010

/* Pacer Clock Control */
#define DAQBOARD2000_AdcPacerInternal            0x0030
#define DAQBOARD2000_AdcPacerExternal            0x0032
#define DAQBOARD2000_AdcPacerEnable              0x0031
#define DAQBOARD2000_AdcPacerEnableDacPacer      0x0034
#define DAQBOARD2000_AdcPacerDisable             0x0030
#define DAQBOARD2000_AdcPacerNormalMode          0x0060
#define DAQBOARD2000_AdcPacerCompatibilityMode   0x0061
#define DAQBOARD2000_AdcPacerInternalOutEnable   0x0008
#define DAQBOARD2000_AdcPacerExternalRising      0x0100

/* DAC status */
#define DAQBOARD2000_DacFull                     0x0001
#define DAQBOARD2000_RefBusy                     0x0002
#define DAQBOARD2000_TrgBusy                     0x0004
#define DAQBOARD2000_CalBusy                     0x0008
#define DAQBOARD2000_Dac0Busy                    0x0010
#define DAQBOARD2000_Dac1Busy                    0x0020
#define DAQBOARD2000_Dac2Busy                    0x0040
#define DAQBOARD2000_Dac3Busy                    0x0080

/* DAC control */
#define DAQBOARD2000_Dac0Enable                  0x0021
#define DAQBOARD2000_Dac1Enable                  0x0031
#define DAQBOARD2000_Dac2Enable                  0x0041
#define DAQBOARD2000_Dac3Enable                  0x0051
#define DAQBOARD2000_DacEnableBit                0x0001
#define DAQBOARD2000_Dac0Disable                 0x0020
#define DAQBOARD2000_Dac1Disable                 0x0030
#define DAQBOARD2000_Dac2Disable                 0x0040
#define DAQBOARD2000_Dac3Disable                 0x0050
#define DAQBOARD2000_DacResetFifo                0x0004
#define DAQBOARD2000_DacPatternDisable           0x0060
#define DAQBOARD2000_DacPatternEnable            0x0061
#define DAQBOARD2000_DacSelectSignedData         0x0002
#define DAQBOARD2000_DacSelectUnsignedData       0x0000

/* Trigger Control */
#define DAQBOARD2000_TrigAnalog                  0x0000
#define DAQBOARD2000_TrigTTL                     0x0010
#define DAQBOARD2000_TrigTransHiLo               0x0004
#define DAQBOARD2000_TrigTransLoHi               0x0000
#define DAQBOARD2000_TrigAbove                   0x0000
#define DAQBOARD2000_TrigBelow                   0x0004
#define DAQBOARD2000_TrigLevelSense              0x0002
#define DAQBOARD2000_TrigEdgeSense               0x0000
#define DAQBOARD2000_TrigEnable                  0x0001
#define DAQBOARD2000_TrigDisable                 0x0000

/* Reference Dac Selection */
#define DAQBOARD2000_PosRefDacSelect             0x0100
#define DAQBOARD2000_NegRefDacSelect             0x0000

static int daqboard2000_attach(struct comedi_device *dev,
			       struct comedi_devconfig *it);
static int daqboard2000_detach(struct comedi_device *dev);

static struct comedi_driver driver_daqboard2000 = {
	.driver_name = "daqboard2000",
	.module = THIS_MODULE,
	.attach = daqboard2000_attach,
	.detach = daqboard2000_detach,
};

struct daq200_boardtype {
	const char *name;
	int id;
};
static const struct daq200_boardtype boardtypes[] = {
	{"ids2", DAQBOARD2000_SUBSYSTEM_IDS2},
	{"ids4", DAQBOARD2000_SUBSYSTEM_IDS4},
};

#define n_boardtypes (sizeof(boardtypes)/sizeof(struct daq200_boardtype))
#define this_board ((const struct daq200_boardtype *)dev->board_ptr)

static DEFINE_PCI_DEVICE_TABLE(daqboard2000_pci_table) = {
	{
	0x1616, 0x0409, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0}, {
	0}
};

MODULE_DEVICE_TABLE(pci, daqboard2000_pci_table);

struct daqboard2000_private {
	enum {
		card_daqboard_2000
	} card;
	struct pci_dev *pci_dev;
	void *daq;
	void *plx;
	int got_regions;
	unsigned int ao_readback[2];
};

#define devpriv ((struct daqboard2000_private *)dev->private)

static void writeAcqScanListEntry(struct comedi_device *dev, u16 entry)
{
	struct daqboard2000_hw *fpga = devpriv->daq;

/* udelay(4); */
	fpga->acqScanListFIFO = entry & 0x00ff;
/* udelay(4); */
	fpga->acqScanListFIFO = (entry >> 8) & 0x00ff;
}

static void setup_sampling(struct comedi_device *dev, int chan, int gain)
{
	u16 word0, word1, word2, word3;

	/* Channel 0-7 diff, channel 8-23 single ended */
	word0 = 0;
	word1 = 0x0004;		/* Last scan */
	word2 = (chan << 6) & 0x00c0;
	switch (chan / 4) {
	case 0:
		word3 = 0x0001;
		break;
	case 1:
		word3 = 0x0002;
		break;
	case 2:
		word3 = 0x0005;
		break;
	case 3:
		word3 = 0x0006;
		break;
	case 4:
		word3 = 0x0041;
		break;
	case 5:
		word3 = 0x0042;
		break;
	default:
		word3 = 0;
		break;
	}
/*
  dev->eeprom.correctionDACSE[i][j][k].offset = 0x800;
  dev->eeprom.correctionDACSE[i][j][k].gain = 0xc00;
*/
	/* These should be read from EEPROM */
	word2 |= 0x0800;
	word3 |= 0xc000;
/*  printk("%d %4.4x %4.4x %4.4x %4.4x\n", chan, word0, word1, word2, word3);*/
	writeAcqScanListEntry(dev, word0);
	writeAcqScanListEntry(dev, word1);
	writeAcqScanListEntry(dev, word2);
	writeAcqScanListEntry(dev, word3);
}

static int daqboard2000_ai_insn_read(struct comedi_device *dev,
				     struct comedi_subdevice *s,
				     struct comedi_insn *insn,
				     unsigned int *data)
{
	int i;
	struct daqboard2000_hw *fpga = devpriv->daq;
	int gain, chan, timeout;

	fpga->acqControl =
	    DAQBOARD2000_AcqResetScanListFifo |
	    DAQBOARD2000_AcqResetResultsFifo | DAQBOARD2000_AcqResetConfigPipe;

	/* If pacer clock is not set to some high value (> 10 us), we
	   risk multiple samples to be put into the result FIFO. */
	fpga->acqPacerClockDivLow = 1000000;	/* 1 second, should be long enough */
	fpga->acqPacerClockDivHigh = 0;

	gain = CR_RANGE(insn->chanspec);
	chan = CR_CHAN(insn->chanspec);

	/* This doesn't look efficient.  I decided to take the conservative
	 * approach when I did the insn conversion.  Perhaps it would be
	 * better to have broken it completely, then someone would have been
	 * forced to fix it.  --ds */
	for (i = 0; i < insn->n; i++) {
		setup_sampling(dev, chan, gain);
		/* Enable reading from the scanlist FIFO */
		fpga->acqControl = DAQBOARD2000_SeqStartScanList;
		for (timeout = 0; timeout < 20; timeout++) {
			if (fpga->acqControl & DAQBOARD2000_AcqConfigPipeFull) {
				break;
			}
			/* udelay(2); */
		}
		fpga->acqControl = DAQBOARD2000_AdcPacerEnable;
		for (timeout = 0; timeout < 20; timeout++) {
			if (fpga->acqControl & DAQBOARD2000_AcqLogicScanning) {
				break;
			}
			/* udelay(2); */
		}
		for (timeout = 0; timeout < 20; timeout++) {
			if (fpga->acqControl &
			    DAQBOARD2000_AcqResultsFIFOHasValidData) {
				break;
			}
			/* udelay(2); */
		}
		data[i] = fpga->acqResultsFIFO;
		fpga->acqControl = DAQBOARD2000_AdcPacerDisable;
		fpga->acqControl = DAQBOARD2000_SeqStopScanList;
	}

	return i;
}

static int daqboard2000_ao_insn_read(struct comedi_device *dev,
				     struct comedi_subdevice *s,
				     struct comedi_insn *insn,
				     unsigned int *data)
{
	int i;
	int chan = CR_CHAN(insn->chanspec);

	for (i = 0; i < insn->n; i++) {
		data[i] = devpriv->ao_readback[chan];
	}

	return i;
}

static int daqboard2000_ao_insn_write(struct comedi_device *dev,
				      struct comedi_subdevice *s,
				      struct comedi_insn *insn,
				      unsigned int *data)
{
	int i;
	int chan = CR_CHAN(insn->chanspec);
	struct daqboard2000_hw *fpga = devpriv->daq;
	int timeout;

	for (i = 0; i < insn->n; i++) {
		/*
		 * OK, since it works OK without enabling the DAC's, let's keep
		 * it as simple as possible...
		 */
		/* fpga->dacControl = (chan + 2) * 0x0010 | 0x0001; udelay(1000); */
		fpga->dacSetting[chan] = data[i];
		for (timeout = 0; timeout < 20; timeout++) {
			if ((fpga->dacControl & ((chan + 1) * 0x0010)) == 0) {
				break;
			}
			/* udelay(2); */
		}
		devpriv->ao_readback[chan] = data[i];
		/*
		 * Since we never enabled the DAC's, we don't need to disable it...
		 * fpga->dacControl = (chan + 2) * 0x0010 | 0x0000; udelay(1000);
		 */
	}

	return i;
}

static void daqboard2000_resetLocalBus(struct comedi_device *dev)
{
	printk("daqboard2000_resetLocalBus\n");
	writel(DAQBOARD2000_SECRLocalBusHi, devpriv->plx + 0x6c);
	udelay(10000);
	writel(DAQBOARD2000_SECRLocalBusLo, devpriv->plx + 0x6c);
	udelay(10000);
}

static void daqboard2000_reloadPLX(struct comedi_device *dev)
{
	printk("daqboard2000_reloadPLX\n");
	writel(DAQBOARD2000_SECRReloadLo, devpriv->plx + 0x6c);
	udelay(10000);
	writel(DAQBOARD2000_SECRReloadHi, devpriv->plx + 0x6c);
	udelay(10000);
	writel(DAQBOARD2000_SECRReloadLo, devpriv->plx + 0x6c);
	udelay(10000);
}

static void daqboard2000_pulseProgPin(struct comedi_device *dev)
{
	printk("daqboard2000_pulseProgPin 1\n");
	writel(DAQBOARD2000_SECRProgPinHi, devpriv->plx + 0x6c);
	udelay(10000);
	writel(DAQBOARD2000_SECRProgPinLo, devpriv->plx + 0x6c);
	udelay(10000);		/* Not in the original code, but I like symmetry... */
}

static int daqboard2000_pollCPLD(struct comedi_device *dev, int mask)
{
	int result = 0;
	int i;
	int cpld;

	/* timeout after 50 tries -> 5ms */
	for (i = 0; i < 50; i++) {
		cpld = readw(devpriv->daq + 0x1000);
		if ((cpld & mask) == mask) {
			result = 1;
			break;
		}
		udelay(100);
	}
	udelay(5);
	return result;
}

static int daqboard2000_writeCPLD(struct comedi_device *dev, int data)
{
	int result = 0;

	udelay(10);
	writew(data, devpriv->daq + 0x1000);
	if ((readw(devpriv->daq + 0x1000) & DAQBOARD2000_CPLD_INIT) ==
	    DAQBOARD2000_CPLD_INIT) {
		result = 1;
	}
	return result;
}

static int initialize_daqboard2000(struct comedi_device *dev,
				   unsigned char *cpld_array, int len)
{
	int result = -EIO;
	/* Read the serial EEPROM control register */
	int secr;
	int retry;
	int i;

	/* Check to make sure the serial eeprom is present on the board */
	secr = readl(devpriv->plx + 0x6c);
	if (!(secr & DAQBOARD2000_EEPROM_PRESENT)) {
#ifdef DEBUG_EEPROM
		printk("no serial eeprom\n");
#endif
		return -EIO;
	}

	for (retry = 0; retry < 3; retry++) {
#ifdef DEBUG_EEPROM
		printk("Programming EEPROM try %x\n", retry);
#endif

		daqboard2000_resetLocalBus(dev);
		daqboard2000_reloadPLX(dev);
		daqboard2000_pulseProgPin(dev);
		if (daqboard2000_pollCPLD(dev, DAQBOARD2000_CPLD_INIT)) {
			for (i = 0; i < len; i++) {
				if (cpld_array[i] == 0xff
				    && cpld_array[i + 1] == 0x20) {
#ifdef DEBUG_EEPROM
					printk("Preamble found at %d\n", i);
#endif
					break;
				}
			}
			for (; i < len; i += 2) {
				int data =
				    (cpld_array[i] << 8) + cpld_array[i + 1];
				if (!daqboard2000_writeCPLD(dev, data)) {
					break;
				}
			}
			if (i >= len) {
#ifdef DEBUG_EEPROM
				printk("Programmed\n");
#endif
				daqboard2000_resetLocalBus(dev);
				daqboard2000_reloadPLX(dev);
				result = 0;
				break;
			}
		}
	}
	return result;
}

static void daqboard2000_adcStopDmaTransfer(struct comedi_device *dev)
{
/*  printk("Implement: daqboard2000_adcStopDmaTransfer\n");*/
}

static void daqboard2000_adcDisarm(struct comedi_device *dev)
{
	struct daqboard2000_hw *fpga = devpriv->daq;

	/* Disable hardware triggers */
	udelay(2);
	fpga->trigControl = DAQBOARD2000_TrigAnalog | DAQBOARD2000_TrigDisable;
	udelay(2);
	fpga->trigControl = DAQBOARD2000_TrigTTL | DAQBOARD2000_TrigDisable;

	/* Stop the scan list FIFO from loading the configuration pipe */
	udelay(2);
	fpga->acqControl = DAQBOARD2000_SeqStopScanList;

	/* Stop the pacer clock */
	udelay(2);
	fpga->acqControl = DAQBOARD2000_AdcPacerDisable;

	/* Stop the input dma (abort channel 1) */
	daqboard2000_adcStopDmaTransfer(dev);
}

static void daqboard2000_activateReferenceDacs(struct comedi_device *dev)
{
	struct daqboard2000_hw *fpga = devpriv->daq;
	int timeout;

	/*  Set the + reference dac value in the FPGA */
	fpga->refDacs = 0x80 | DAQBOARD2000_PosRefDacSelect;
	for (timeout = 0; timeout < 20; timeout++) {
		if ((fpga->dacControl & DAQBOARD2000_RefBusy) == 0) {
			break;
		}
		udelay(2);
	}
/*  printk("DAQBOARD2000_PosRefDacSelect %d\n", timeout);*/

	/*  Set the - reference dac value in the FPGA */
	fpga->refDacs = 0x80 | DAQBOARD2000_NegRefDacSelect;
	for (timeout = 0; timeout < 20; timeout++) {
		if ((fpga->dacControl & DAQBOARD2000_RefBusy) == 0) {
			break;
		}
		udelay(2);
	}
/*  printk("DAQBOARD2000_NegRefDacSelect %d\n", timeout);*/
}

static void daqboard2000_initializeCtrs(struct comedi_device *dev)
{
/*  printk("Implement: daqboard2000_initializeCtrs\n");*/
}

static void daqboard2000_initializeTmrs(struct comedi_device *dev)
{
/*  printk("Implement: daqboard2000_initializeTmrs\n");*/
}

static void daqboard2000_dacDisarm(struct comedi_device *dev)
{
/*  printk("Implement: daqboard2000_dacDisarm\n");*/
}

static void daqboard2000_initializeAdc(struct comedi_device *dev)
{
	daqboard2000_adcDisarm(dev);
	daqboard2000_activateReferenceDacs(dev);
	daqboard2000_initializeCtrs(dev);
	daqboard2000_initializeTmrs(dev);
}

static void daqboard2000_initializeDac(struct comedi_device *dev)
{
	daqboard2000_dacDisarm(dev);
}

/*
The test command, REMOVE!!:

rmmod daqboard2000 ; rmmod comedi; make install ; modprobe daqboard2000; /usr/sbin/comedi_config /dev/comedi0 daqboard/2000 ; tail -40 /var/log/messages
*/

static int daqboard2000_8255_cb(int dir, int port, int data,
				unsigned long ioaddr)
{
	int result = 0;
	if (dir) {
		writew(data, ((void *)ioaddr) + port * 2);
		result = 0;
	} else {
		result = readw(((void *)ioaddr) + port * 2);
	}
/*
  printk("daqboard2000_8255_cb %x %d %d %2.2x -> %2.2x\n",
        arg, dir, port, data, result);
*/
	return result;
}

static int daqboard2000_attach(struct comedi_device *dev,
			       struct comedi_devconfig *it)
{
	int result = 0;
	struct comedi_subdevice *s;
	struct pci_dev *card = NULL;
	void *aux_data;
	unsigned int aux_len;
	int bus, slot;

	printk("comedi%d: daqboard2000:", dev->minor);

	bus = it->options[0];
	slot = it->options[1];

	result = alloc_private(dev, sizeof(struct daqboard2000_private));
	if (result < 0) {
		return -ENOMEM;
	}
	for (card = pci_get_device(0x1616, 0x0409, NULL);
	     card != NULL; card = pci_get_device(0x1616, 0x0409, card)) {
		if (bus || slot) {
			/* requested particular bus/slot */
			if (card->bus->number != bus ||
			    PCI_SLOT(card->devfn) != slot) {
				continue;
			}
		}
		break;		/* found one */
	}
	if (!card) {
		if (bus || slot)
			printk(" no daqboard2000 found at bus/slot: %d/%d\n",
			       bus, slot);
		else
			printk(" no daqboard2000 found\n");
		return -EIO;
	} else {
		u32 id;
		int i;
		devpriv->pci_dev = card;
		id = ((u32) card->
		      subsystem_device << 16) | card->subsystem_vendor;
		for (i = 0; i < n_boardtypes; i++) {
			if (boardtypes[i].id == id) {
				printk(" %s", boardtypes[i].name);
				dev->board_ptr = boardtypes + i;
			}
		}
		if (!dev->board_ptr) {
			printk
			    (" unknown subsystem id %08x (pretend it is an ids2)",
			     id);
			dev->board_ptr = boardtypes;
		}
	}

	result = comedi_pci_enable(card, "daqboard2000");
	if (result < 0) {
		printk(" failed to enable PCI device and request regions\n");
		return -EIO;
	}
	devpriv->got_regions = 1;
	devpriv->plx =
	    ioremap(pci_resource_start(card, 0), DAQBOARD2000_PLX_SIZE);
	devpriv->daq =
	    ioremap(pci_resource_start(card, 2), DAQBOARD2000_DAQ_SIZE);
	if (!devpriv->plx || !devpriv->daq) {
		return -ENOMEM;
	}

	result = alloc_subdevices(dev, 3);
	if (result < 0)
		goto out;

	readl(devpriv->plx + 0x6c);

	/*
	   u8 interrupt;
	   Windows code does restore interrupts, but since we don't use them...
	   pci_read_config_byte(card, PCI_INTERRUPT_LINE, &interrupt);
	   printk("Interrupt before is: %x\n", interrupt);
	 */

	aux_data = comedi_aux_data(it->options, 0);
	aux_len = it->options[COMEDI_DEVCONF_AUX_DATA_LENGTH];

	if (aux_data && aux_len) {
		result = initialize_daqboard2000(dev, aux_data, aux_len);
	} else {
		printk("no FPGA initialization code, aborting\n");
		result = -EIO;
	}
	if (result < 0)
		goto out;
	daqboard2000_initializeAdc(dev);
	daqboard2000_initializeDac(dev);
	/*
	   Windows code does restore interrupts, but since we don't use them...
	   pci_read_config_byte(card, PCI_INTERRUPT_LINE, &interrupt);
	   printk("Interrupt after is: %x\n", interrupt);
	 */

	dev->iobase = (unsigned long)devpriv->daq;

	dev->board_name = this_board->name;

	s = dev->subdevices + 0;
	/* ai subdevice */
	s->type = COMEDI_SUBD_AI;
	s->subdev_flags = SDF_READABLE | SDF_GROUND;
	s->n_chan = 24;
	s->maxdata = 0xffff;
	s->insn_read = daqboard2000_ai_insn_read;
	s->range_table = &range_daqboard2000_ai;

	s = dev->subdevices + 1;
	/* ao subdevice */
	s->type = COMEDI_SUBD_AO;
	s->subdev_flags = SDF_WRITABLE;
	s->n_chan = 2;
	s->maxdata = 0xffff;
	s->insn_read = daqboard2000_ao_insn_read;
	s->insn_write = daqboard2000_ao_insn_write;
	s->range_table = &range_daqboard2000_ao;

	s = dev->subdevices + 2;
	result = subdev_8255_init(dev, s, daqboard2000_8255_cb,
				  (unsigned long)(dev->iobase + 0x40));

	printk("\n");
out:
	return result;
}

static int daqboard2000_detach(struct comedi_device *dev)
{
	printk("comedi%d: daqboard2000: remove\n", dev->minor);

	if (dev->subdevices)
		subdev_8255_cleanup(dev, dev->subdevices + 2);

	if (dev->irq) {
		free_irq(dev->irq, dev);
	}
	if (devpriv) {
		if (devpriv->daq)
			iounmap(devpriv->daq);
		if (devpriv->plx)
			iounmap(devpriv->plx);
		if (devpriv->pci_dev) {
			if (devpriv->got_regions) {
				comedi_pci_disable(devpriv->pci_dev);
			}
			pci_dev_put(devpriv->pci_dev);
		}
	}
	return 0;
}

static int __devinit driver_daqboard2000_pci_probe(struct pci_dev *dev,
						   const struct pci_device_id
						   *ent)
{
	return comedi_pci_auto_config(dev, driver_daqboard2000.driver_name);
}

static void __devexit driver_daqboard2000_pci_remove(struct pci_dev *dev)
{
	comedi_pci_auto_unconfig(dev);
}

static struct pci_driver driver_daqboard2000_pci_driver = {
	.id_table = daqboard2000_pci_table,
	.probe = &driver_daqboard2000_pci_probe,
	.remove = __devexit_p(&driver_daqboard2000_pci_remove)
};

static int __init driver_daqboard2000_init_module(void)
{
	int retval;

	retval = comedi_driver_register(&driver_daqboard2000);
	if (retval < 0)
		return retval;

	driver_daqboard2000_pci_driver.name =
	    (char *)driver_daqboard2000.driver_name;
	return pci_register_driver(&driver_daqboard2000_pci_driver);
}

static void __exit driver_daqboard2000_cleanup_module(void)
{
	pci_unregister_driver(&driver_daqboard2000_pci_driver);
	comedi_driver_unregister(&driver_daqboard2000);
}

module_init(driver_daqboard2000_init_module);
module_exit(driver_daqboard2000_cleanup_module);

MODULE_AUTHOR("Comedi http://www.comedi.org");
MODULE_DESCRIPTION("Comedi low-level driver");
MODULE_LICENSE("GPL");