Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
/*
 * comedi/drivers/cb_pcidda.c
 * Driver for the ComputerBoards / MeasurementComputing PCI-DDA series.
 *
 * Copyright (C) 2001 Ivan Martinez <ivanmr@altavista.com>
 * Copyright (C) 2001 Frank Mori Hess <fmhess@users.sourceforge.net>
 *
 * COMEDI - Linux Control and Measurement Device Interface
 * Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
 *
 * 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.
 */

/*
 * Driver: cb_pcidda
 * Description: MeasurementComputing PCI-DDA series
 * Devices: [Measurement Computing] PCI-DDA08/12 (pci-dda08/12),
 *   PCI-DDA04/12 (pci-dda04/12), PCI-DDA02/12 (pci-dda02/12),
 *   PCI-DDA08/16 (pci-dda08/16), PCI-DDA04/16 (pci-dda04/16),
 *   PCI-DDA02/16 (pci-dda02/16)
 * Author: Ivan Martinez <ivanmr@altavista.com>
 *	   Frank Mori Hess <fmhess@users.sourceforge.net>
 * Status: works
 *
 * Configuration options: not applicable, uses PCI auto config
 *
 * Only simple analog output writing is supported.
 */

#include <linux/module.h>

#include "../comedi_pci.h"

#include "8255.h"

#define EEPROM_SIZE	128	/*  number of entries in eeprom */
/* maximum number of ao channels for supported boards */
#define MAX_AO_CHANNELS 8

/* Digital I/O registers */
#define CB_DDA_DIO0_8255_BASE		0x00
#define CB_DDA_DIO1_8255_BASE		0x04

/* DAC registers */
#define CB_DDA_DA_CTRL_REG		0x00	   /* D/A Control Register  */
#define CB_DDA_DA_CTRL_SU		BIT(0)   /*  Simultaneous update  */
#define CB_DDA_DA_CTRL_EN		BIT(1)   /*  Enable specified DAC */
#define CB_DDA_DA_CTRL_DAC(x)		((x) << 2) /*  Specify DAC channel  */
#define CB_DDA_DA_CTRL_RANGE2V5		(0 << 6)   /*  2.5V range           */
#define CB_DDA_DA_CTRL_RANGE5V		(2 << 6)   /*  5V range             */
#define CB_DDA_DA_CTRL_RANGE10V		(3 << 6)   /*  10V range            */
#define CB_DDA_DA_CTRL_UNIP		BIT(8)   /*  Unipolar range       */

#define DACALIBRATION1	4	/*  D/A CALIBRATION REGISTER 1 */
/* write bits */
/* serial data input for eeprom, caldacs, reference dac */
#define SERIAL_IN_BIT   0x1
#define	CAL_CHANNEL_MASK	(0x7 << 1)
#define	CAL_CHANNEL_BITS(channel)	(((channel) << 1) & CAL_CHANNEL_MASK)
/* read bits */
#define	CAL_COUNTER_MASK	0x1f
/* calibration counter overflow status bit */
#define CAL_COUNTER_OVERFLOW_BIT        0x20
/* analog output is less than reference dac voltage */
#define AO_BELOW_REF_BIT        0x40
#define	SERIAL_OUT_BIT	0x80	/*  serial data out, for reading from eeprom */

#define DACALIBRATION2	6	/*  D/A CALIBRATION REGISTER 2 */
#define	SELECT_EEPROM_BIT	0x1	/*  send serial data in to eeprom */
/* don't send serial data to MAX542 reference dac */
#define DESELECT_REF_DAC_BIT    0x2
/* don't send serial data to caldac n */
#define DESELECT_CALDAC_BIT(n)  (0x4 << (n))
/* manual says to set this bit with no explanation */
#define DUMMY_BIT       0x40

#define CB_DDA_DA_DATA_REG(x)		(0x08 + ((x) * 2))

/* Offsets for the caldac channels */
#define CB_DDA_CALDAC_FINE_GAIN		0
#define CB_DDA_CALDAC_COURSE_GAIN	1
#define CB_DDA_CALDAC_COURSE_OFFSET	2
#define CB_DDA_CALDAC_FINE_OFFSET	3

static const struct comedi_lrange cb_pcidda_ranges = {
	6, {
		BIP_RANGE(10),
		BIP_RANGE(5),
		BIP_RANGE(2.5),
		UNI_RANGE(10),
		UNI_RANGE(5),
		UNI_RANGE(2.5)
	}
};

enum cb_pcidda_boardid {
	BOARD_DDA02_12,
	BOARD_DDA04_12,
	BOARD_DDA08_12,
	BOARD_DDA02_16,
	BOARD_DDA04_16,
	BOARD_DDA08_16,
};

struct cb_pcidda_board {
	const char *name;
	int ao_chans;
	int ao_bits;
};

static const struct cb_pcidda_board cb_pcidda_boards[] = {
	[BOARD_DDA02_12] = {
		.name		= "pci-dda02/12",
		.ao_chans	= 2,
		.ao_bits	= 12,
	},
	[BOARD_DDA04_12] = {
		.name		= "pci-dda04/12",
		.ao_chans	= 4,
		.ao_bits	= 12,
	},
	[BOARD_DDA08_12] = {
		.name		= "pci-dda08/12",
		.ao_chans	= 8,
		.ao_bits	= 12,
	},
	[BOARD_DDA02_16] = {
		.name		= "pci-dda02/16",
		.ao_chans	= 2,
		.ao_bits	= 16,
	},
	[BOARD_DDA04_16] = {
		.name		= "pci-dda04/16",
		.ao_chans	= 4,
		.ao_bits	= 16,
	},
	[BOARD_DDA08_16] = {
		.name		= "pci-dda08/16",
		.ao_chans	= 8,
		.ao_bits	= 16,
	},
};

struct cb_pcidda_private {
	unsigned long daqio;
	/* bits last written to da calibration register 1 */
	unsigned int dac_cal1_bits;
	/* current range settings for output channels */
	unsigned int ao_range[MAX_AO_CHANNELS];
	u16 eeprom_data[EEPROM_SIZE];	/*  software copy of board's eeprom */
};

/* lowlevel read from eeprom */
static unsigned int cb_pcidda_serial_in(struct comedi_device *dev)
{
	struct cb_pcidda_private *devpriv = dev->private;
	unsigned int value = 0;
	int i;
	const int value_width = 16;	/*  number of bits wide values are */

	for (i = 1; i <= value_width; i++) {
		/*  read bits most significant bit first */
		if (inw_p(devpriv->daqio + DACALIBRATION1) & SERIAL_OUT_BIT)
			value |= 1 << (value_width - i);
	}

	return value;
}

/* lowlevel write to eeprom/dac */
static void cb_pcidda_serial_out(struct comedi_device *dev, unsigned int value,
				 unsigned int num_bits)
{
	struct cb_pcidda_private *devpriv = dev->private;
	int i;

	for (i = 1; i <= num_bits; i++) {
		/*  send bits most significant bit first */
		if (value & (1 << (num_bits - i)))
			devpriv->dac_cal1_bits |= SERIAL_IN_BIT;
		else
			devpriv->dac_cal1_bits &= ~SERIAL_IN_BIT;
		outw_p(devpriv->dac_cal1_bits, devpriv->daqio + DACALIBRATION1);
	}
}

/* reads a 16 bit value from board's eeprom */
static unsigned int cb_pcidda_read_eeprom(struct comedi_device *dev,
					  unsigned int address)
{
	struct cb_pcidda_private *devpriv = dev->private;
	unsigned int i;
	unsigned int cal2_bits;
	unsigned int value;
	/* one caldac for every two dac channels */
	const int max_num_caldacs = 4;
	/* bits to send to tell eeprom we want to read */
	const int read_instruction = 0x6;
	const int instruction_length = 3;
	const int address_length = 8;

	/*  send serial output stream to eeprom */
	cal2_bits = SELECT_EEPROM_BIT | DESELECT_REF_DAC_BIT | DUMMY_BIT;
	/*  deactivate caldacs (one caldac for every two channels) */
	for (i = 0; i < max_num_caldacs; i++)
		cal2_bits |= DESELECT_CALDAC_BIT(i);
	outw_p(cal2_bits, devpriv->daqio + DACALIBRATION2);

	/*  tell eeprom we want to read */
	cb_pcidda_serial_out(dev, read_instruction, instruction_length);
	/*  send address we want to read from */
	cb_pcidda_serial_out(dev, address, address_length);

	value = cb_pcidda_serial_in(dev);

	/*  deactivate eeprom */
	cal2_bits &= ~SELECT_EEPROM_BIT;
	outw_p(cal2_bits, devpriv->daqio + DACALIBRATION2);

	return value;
}

/* writes to 8 bit calibration dacs */
static void cb_pcidda_write_caldac(struct comedi_device *dev,
				   unsigned int caldac, unsigned int channel,
				   unsigned int value)
{
	struct cb_pcidda_private *devpriv = dev->private;
	unsigned int cal2_bits;
	unsigned int i;
	/* caldacs use 3 bit channel specification */
	const int num_channel_bits = 3;
	const int num_caldac_bits = 8;	/*  8 bit calibration dacs */
	/* one caldac for every two dac channels */
	const int max_num_caldacs = 4;

	/* write 3 bit channel */
	cb_pcidda_serial_out(dev, channel, num_channel_bits);
	/*  write 8 bit caldac value */
	cb_pcidda_serial_out(dev, value, num_caldac_bits);

/*
 * latch stream into appropriate caldac deselect reference dac
 */
	cal2_bits = DESELECT_REF_DAC_BIT | DUMMY_BIT;
	/*  deactivate caldacs (one caldac for every two channels) */
	for (i = 0; i < max_num_caldacs; i++)
		cal2_bits |= DESELECT_CALDAC_BIT(i);
	/*  activate the caldac we want */
	cal2_bits &= ~DESELECT_CALDAC_BIT(caldac);
	outw_p(cal2_bits, devpriv->daqio + DACALIBRATION2);
	/*  deactivate caldac */
	cal2_bits |= DESELECT_CALDAC_BIT(caldac);
	outw_p(cal2_bits, devpriv->daqio + DACALIBRATION2);
}

/* set caldacs to eeprom values for given channel and range */
static void cb_pcidda_calibrate(struct comedi_device *dev, unsigned int channel,
				unsigned int range)
{
	struct cb_pcidda_private *devpriv = dev->private;
	unsigned int caldac = channel / 2;	/* two caldacs per channel */
	unsigned int chan = 4 * (channel % 2);	/* caldac channel base */
	unsigned int index = 2 * range + 12 * channel;
	unsigned int offset;
	unsigned int gain;

	/* save range so we can tell when we need to readjust calibration */
	devpriv->ao_range[channel] = range;

	/* get values from eeprom data */
	offset = devpriv->eeprom_data[0x7 + index];
	gain = devpriv->eeprom_data[0x8 + index];

	/* set caldacs */
	cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_COURSE_OFFSET,
			       (offset >> 8) & 0xff);
	cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_FINE_OFFSET,
			       offset & 0xff);
	cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_COURSE_GAIN,
			       (gain >> 8) & 0xff);
	cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_FINE_GAIN,
			       gain & 0xff);
}

static int cb_pcidda_ao_insn_write(struct comedi_device *dev,
				   struct comedi_subdevice *s,
				   struct comedi_insn *insn,
				   unsigned int *data)
{
	struct cb_pcidda_private *devpriv = dev->private;
	unsigned int channel = CR_CHAN(insn->chanspec);
	unsigned int range = CR_RANGE(insn->chanspec);
	unsigned int ctrl;

	if (range != devpriv->ao_range[channel])
		cb_pcidda_calibrate(dev, channel, range);

	ctrl = CB_DDA_DA_CTRL_EN | CB_DDA_DA_CTRL_DAC(channel);

	switch (range) {
	case 0:
	case 3:
		ctrl |= CB_DDA_DA_CTRL_RANGE10V;
		break;
	case 1:
	case 4:
		ctrl |= CB_DDA_DA_CTRL_RANGE5V;
		break;
	case 2:
	case 5:
		ctrl |= CB_DDA_DA_CTRL_RANGE2V5;
		break;
	}

	if (range > 2)
		ctrl |= CB_DDA_DA_CTRL_UNIP;

	outw(ctrl, devpriv->daqio + CB_DDA_DA_CTRL_REG);

	outw(data[0], devpriv->daqio + CB_DDA_DA_DATA_REG(channel));

	return insn->n;
}

static int cb_pcidda_auto_attach(struct comedi_device *dev,
				 unsigned long context)
{
	struct pci_dev *pcidev = comedi_to_pci_dev(dev);
	const struct cb_pcidda_board *board = NULL;
	struct cb_pcidda_private *devpriv;
	struct comedi_subdevice *s;
	int i;
	int ret;

	if (context < ARRAY_SIZE(cb_pcidda_boards))
		board = &cb_pcidda_boards[context];
	if (!board)
		return -ENODEV;
	dev->board_ptr = board;
	dev->board_name = board->name;

	devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
	if (!devpriv)
		return -ENOMEM;

	ret = comedi_pci_enable(dev);
	if (ret)
		return ret;
	dev->iobase = pci_resource_start(pcidev, 2);
	devpriv->daqio = pci_resource_start(pcidev, 3);

	ret = comedi_alloc_subdevices(dev, 3);
	if (ret)
		return ret;

	s = &dev->subdevices[0];
	/* analog output subdevice */
	s->type = COMEDI_SUBD_AO;
	s->subdev_flags = SDF_WRITABLE;
	s->n_chan = board->ao_chans;
	s->maxdata = (1 << board->ao_bits) - 1;
	s->range_table = &cb_pcidda_ranges;
	s->insn_write = cb_pcidda_ao_insn_write;

	/* two 8255 digital io subdevices */
	for (i = 0; i < 2; i++) {
		s = &dev->subdevices[1 + i];
		ret = subdev_8255_init(dev, s, NULL, i * I8255_SIZE);
		if (ret)
			return ret;
	}

	/* Read the caldac eeprom data */
	for (i = 0; i < EEPROM_SIZE; i++)
		devpriv->eeprom_data[i] = cb_pcidda_read_eeprom(dev, i);

	/*  set calibrations dacs */
	for (i = 0; i < board->ao_chans; i++)
		cb_pcidda_calibrate(dev, i, devpriv->ao_range[i]);

	return 0;
}

static struct comedi_driver cb_pcidda_driver = {
	.driver_name	= "cb_pcidda",
	.module		= THIS_MODULE,
	.auto_attach	= cb_pcidda_auto_attach,
	.detach		= comedi_pci_detach,
};

static int cb_pcidda_pci_probe(struct pci_dev *dev,
			       const struct pci_device_id *id)
{
	return comedi_pci_auto_config(dev, &cb_pcidda_driver,
				      id->driver_data);
}

static const struct pci_device_id cb_pcidda_pci_table[] = {
	{ PCI_VDEVICE(CB, 0x0020), BOARD_DDA02_12 },
	{ PCI_VDEVICE(CB, 0x0021), BOARD_DDA04_12 },
	{ PCI_VDEVICE(CB, 0x0022), BOARD_DDA08_12 },
	{ PCI_VDEVICE(CB, 0x0023), BOARD_DDA02_16 },
	{ PCI_VDEVICE(CB, 0x0024), BOARD_DDA04_16 },
	{ PCI_VDEVICE(CB, 0x0025), BOARD_DDA08_16 },
	{ 0 }
};
MODULE_DEVICE_TABLE(pci, cb_pcidda_pci_table);

static struct pci_driver cb_pcidda_pci_driver = {
	.name		= "cb_pcidda",
	.id_table	= cb_pcidda_pci_table,
	.probe		= cb_pcidda_pci_probe,
	.remove		= comedi_pci_auto_unconfig,
};
module_comedi_pci_driver(cb_pcidda_driver, cb_pcidda_pci_driver);

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