2 * comedi/drivers/cb_pcidda.c
3 * Driver for the ComputerBoards / MeasurementComputing PCI-DDA series.
5 * Copyright (C) 2001 Ivan Martinez <ivanmr@altavista.com>
6 * Copyright (C) 2001 Frank Mori Hess <fmhess@users.sourceforge.net>
8 * COMEDI - Linux Control and Measurement Device Interface
9 * Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 * Description: MeasurementComputing PCI-DDA series
29 * Devices: (Measurement Computing) PCI-DDA08/12 [pci-dda08/12]
30 * (Measurement Computing) PCI-DDA04/12 [pci-dda04/12]
31 * (Measurement Computing) PCI-DDA02/12 [pci-dda02/12]
32 * (Measurement Computing) PCI-DDA08/16 [pci-dda08/16]
33 * (Measurement Computing) PCI-DDA04/16 [pci-dda04/16]
34 * (Measurement Computing) PCI-DDA02/16 [pci-dda02/16]
35 * Author: Ivan Martinez <ivanmr@altavista.com>
36 * Frank Mori Hess <fmhess@users.sourceforge.net>
39 * Configuration options: not applicable, uses PCI auto config
41 * Only simple analog output writing is supported.
44 #include <linux/pci.h>
46 #include "../comedidev.h"
48 #include "comedi_fc.h"
52 * ComputerBoards PCI Device ID's supported by this driver
54 #define PCI_DEVICE_ID_DDA02_12 0x0020
55 #define PCI_DEVICE_ID_DDA04_12 0x0021
56 #define PCI_DEVICE_ID_DDA08_12 0x0022
57 #define PCI_DEVICE_ID_DDA02_16 0x0023
58 #define PCI_DEVICE_ID_DDA04_16 0x0024
59 #define PCI_DEVICE_ID_DDA08_16 0x0025
61 #define EEPROM_SIZE 128 /* number of entries in eeprom */
62 /* maximum number of ao channels for supported boards */
63 #define MAX_AO_CHANNELS 8
65 /* Digital I/O registers */
66 #define CB_DDA_DIO0_8255_BASE 0x00
67 #define CB_DDA_DIO1_8255_BASE 0x04
70 #define CB_DDA_DA_CTRL_REG 0x00 /* D/A Control Register */
71 #define CB_DDA_DA_CTRL_SU (1 << 0) /* Simultaneous update */
72 #define CB_DDA_DA_CTRL_EN (1 << 1) /* Enable specified DAC */
73 #define CB_DDA_DA_CTRL_DAC(x) ((x) << 2) /* Specify DAC channel */
74 #define CB_DDA_DA_CTRL_RANGE2V5 (0 << 6) /* 2.5V range */
75 #define CB_DDA_DA_CTRL_RANGE5V (2 << 6) /* 5V range */
76 #define CB_DDA_DA_CTRL_RANGE10V (3 << 6) /* 10V range */
77 #define CB_DDA_DA_CTRL_UNIP (1 << 8) /* Unipolar range */
79 #define DACALIBRATION1 4 /* D/A CALIBRATION REGISTER 1 */
81 /* serial data input for eeprom, caldacs, reference dac */
82 #define SERIAL_IN_BIT 0x1
83 #define CAL_CHANNEL_MASK (0x7 << 1)
84 #define CAL_CHANNEL_BITS(channel) (((channel) << 1) & CAL_CHANNEL_MASK)
86 #define CAL_COUNTER_MASK 0x1f
87 /* calibration counter overflow status bit */
88 #define CAL_COUNTER_OVERFLOW_BIT 0x20
89 /* analog output is less than reference dac voltage */
90 #define AO_BELOW_REF_BIT 0x40
91 #define SERIAL_OUT_BIT 0x80 /* serial data out, for reading from eeprom */
93 #define DACALIBRATION2 6 /* D/A CALIBRATION REGISTER 2 */
94 #define SELECT_EEPROM_BIT 0x1 /* send serial data in to eeprom */
95 /* don't send serial data to MAX542 reference dac */
96 #define DESELECT_REF_DAC_BIT 0x2
97 /* don't send serial data to caldac n */
98 #define DESELECT_CALDAC_BIT(n) (0x4 << (n))
99 /* manual says to set this bit with no explanation */
100 #define DUMMY_BIT 0x40
102 #define CB_DDA_DA_DATA_REG(x) (0x08 + ((x) * 2))
104 /* Offsets for the caldac channels */
105 #define CB_DDA_CALDAC_FINE_GAIN 0
106 #define CB_DDA_CALDAC_COURSE_GAIN 1
107 #define CB_DDA_CALDAC_COURSE_OFFSET 2
108 #define CB_DDA_CALDAC_FINE_OFFSET 3
110 static const struct comedi_lrange cb_pcidda_ranges = {
121 struct cb_pcidda_board {
123 unsigned short device_id;
128 static const struct cb_pcidda_board cb_pcidda_boards[] = {
130 .name = "pci-dda02/12",
131 .device_id = PCI_DEVICE_ID_DDA02_12,
135 .name = "pci-dda04/12",
136 .device_id = PCI_DEVICE_ID_DDA04_12,
140 .name = "pci-dda08/12",
141 .device_id = PCI_DEVICE_ID_DDA08_12,
145 .name = "pci-dda02/16",
146 .device_id = PCI_DEVICE_ID_DDA02_16,
150 .name = "pci-dda04/16",
151 .device_id = PCI_DEVICE_ID_DDA04_16,
155 .name = "pci-dda08/16",
156 .device_id = PCI_DEVICE_ID_DDA08_16,
162 struct cb_pcidda_private {
163 /* bits last written to da calibration register 1 */
164 unsigned int dac_cal1_bits;
165 /* current range settings for output channels */
166 unsigned int ao_range[MAX_AO_CHANNELS];
167 u16 eeprom_data[EEPROM_SIZE]; /* software copy of board's eeprom */
170 /* lowlevel read from eeprom */
171 static unsigned int cb_pcidda_serial_in(struct comedi_device *dev)
173 unsigned int value = 0;
175 const int value_width = 16; /* number of bits wide values are */
177 for (i = 1; i <= value_width; i++) {
178 /* read bits most significant bit first */
179 if (inw_p(dev->iobase + DACALIBRATION1) & SERIAL_OUT_BIT)
180 value |= 1 << (value_width - i);
186 /* lowlevel write to eeprom/dac */
187 static void cb_pcidda_serial_out(struct comedi_device *dev, unsigned int value,
188 unsigned int num_bits)
190 struct cb_pcidda_private *devpriv = dev->private;
193 for (i = 1; i <= num_bits; i++) {
194 /* send bits most significant bit first */
195 if (value & (1 << (num_bits - i)))
196 devpriv->dac_cal1_bits |= SERIAL_IN_BIT;
198 devpriv->dac_cal1_bits &= ~SERIAL_IN_BIT;
199 outw_p(devpriv->dac_cal1_bits, dev->iobase + DACALIBRATION1);
203 /* reads a 16 bit value from board's eeprom */
204 static unsigned int cb_pcidda_read_eeprom(struct comedi_device *dev,
205 unsigned int address)
208 unsigned int cal2_bits;
210 /* one caldac for every two dac channels */
211 const int max_num_caldacs = 4;
212 /* bits to send to tell eeprom we want to read */
213 const int read_instruction = 0x6;
214 const int instruction_length = 3;
215 const int address_length = 8;
217 /* send serial output stream to eeprom */
218 cal2_bits = SELECT_EEPROM_BIT | DESELECT_REF_DAC_BIT | DUMMY_BIT;
219 /* deactivate caldacs (one caldac for every two channels) */
220 for (i = 0; i < max_num_caldacs; i++)
221 cal2_bits |= DESELECT_CALDAC_BIT(i);
222 outw_p(cal2_bits, dev->iobase + DACALIBRATION2);
224 /* tell eeprom we want to read */
225 cb_pcidda_serial_out(dev, read_instruction, instruction_length);
226 /* send address we want to read from */
227 cb_pcidda_serial_out(dev, address, address_length);
229 value = cb_pcidda_serial_in(dev);
231 /* deactivate eeprom */
232 cal2_bits &= ~SELECT_EEPROM_BIT;
233 outw_p(cal2_bits, dev->iobase + DACALIBRATION2);
238 /* writes to 8 bit calibration dacs */
239 static void cb_pcidda_write_caldac(struct comedi_device *dev,
240 unsigned int caldac, unsigned int channel,
243 unsigned int cal2_bits;
245 /* caldacs use 3 bit channel specification */
246 const int num_channel_bits = 3;
247 const int num_caldac_bits = 8; /* 8 bit calibration dacs */
248 /* one caldac for every two dac channels */
249 const int max_num_caldacs = 4;
251 /* write 3 bit channel */
252 cb_pcidda_serial_out(dev, channel, num_channel_bits);
253 /* write 8 bit caldac value */
254 cb_pcidda_serial_out(dev, value, num_caldac_bits);
257 * latch stream into appropriate caldac deselect reference dac
259 cal2_bits = DESELECT_REF_DAC_BIT | DUMMY_BIT;
260 /* deactivate caldacs (one caldac for every two channels) */
261 for (i = 0; i < max_num_caldacs; i++)
262 cal2_bits |= DESELECT_CALDAC_BIT(i);
263 /* activate the caldac we want */
264 cal2_bits &= ~DESELECT_CALDAC_BIT(caldac);
265 outw_p(cal2_bits, dev->iobase + DACALIBRATION2);
266 /* deactivate caldac */
267 cal2_bits |= DESELECT_CALDAC_BIT(caldac);
268 outw_p(cal2_bits, dev->iobase + DACALIBRATION2);
271 /* set caldacs to eeprom values for given channel and range */
272 static void cb_pcidda_calibrate(struct comedi_device *dev, unsigned int channel,
275 struct cb_pcidda_private *devpriv = dev->private;
276 unsigned int caldac = channel / 2; /* two caldacs per channel */
277 unsigned int chan = 4 * (channel % 2); /* caldac channel base */
278 unsigned int index = 2 * range + 12 * channel;
282 /* save range so we can tell when we need to readjust calibration */
283 devpriv->ao_range[channel] = range;
285 /* get values from eeprom data */
286 offset = devpriv->eeprom_data[0x7 + index];
287 gain = devpriv->eeprom_data[0x8 + index];
290 cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_COURSE_OFFSET,
291 (offset >> 8) & 0xff);
292 cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_FINE_OFFSET,
294 cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_COURSE_GAIN,
296 cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_FINE_GAIN,
300 static int cb_pcidda_ao_insn_write(struct comedi_device *dev,
301 struct comedi_subdevice *s,
302 struct comedi_insn *insn,
305 struct cb_pcidda_private *devpriv = dev->private;
306 unsigned int channel = CR_CHAN(insn->chanspec);
307 unsigned int range = CR_RANGE(insn->chanspec);
310 if (range != devpriv->ao_range[channel])
311 cb_pcidda_calibrate(dev, channel, range);
313 ctrl = CB_DDA_DA_CTRL_EN | CB_DDA_DA_CTRL_DAC(channel);
318 ctrl |= CB_DDA_DA_CTRL_RANGE10V;
322 ctrl |= CB_DDA_DA_CTRL_RANGE5V;
326 ctrl |= CB_DDA_DA_CTRL_RANGE2V5;
331 ctrl |= CB_DDA_DA_CTRL_UNIP;
333 outw(ctrl, dev->iobase + CB_DDA_DA_CTRL_REG);
335 outw(data[0], dev->iobase + CB_DDA_DA_DATA_REG(channel));
340 static const void *cb_pcidda_find_boardinfo(struct comedi_device *dev,
341 struct pci_dev *pcidev)
343 const struct cb_pcidda_board *thisboard;
346 for (i = 0; i < ARRAY_SIZE(cb_pcidda_boards); i++) {
347 thisboard = &cb_pcidda_boards[i];
348 if (thisboard->device_id != pcidev->device)
354 static int cb_pcidda_auto_attach(struct comedi_device *dev,
355 unsigned long context_unused)
357 struct pci_dev *pcidev = comedi_to_pci_dev(dev);
358 const struct cb_pcidda_board *thisboard;
359 struct cb_pcidda_private *devpriv;
360 struct comedi_subdevice *s;
361 unsigned long iobase_8255;
365 thisboard = cb_pcidda_find_boardinfo(dev, pcidev);
368 dev->board_ptr = thisboard;
369 dev->board_name = thisboard->name;
371 devpriv = kzalloc(sizeof(*devpriv), GFP_KERNEL);
374 dev->private = devpriv;
376 ret = comedi_pci_enable(pcidev, dev->board_name);
379 dev->iobase = pci_resource_start(pcidev, 3);
380 iobase_8255 = pci_resource_start(pcidev, 2);
382 ret = comedi_alloc_subdevices(dev, 3);
386 s = &dev->subdevices[0];
387 /* analog output subdevice */
388 s->type = COMEDI_SUBD_AO;
389 s->subdev_flags = SDF_WRITABLE;
390 s->n_chan = thisboard->ao_chans;
391 s->maxdata = (1 << thisboard->ao_bits) - 1;
392 s->range_table = &cb_pcidda_ranges;
393 s->insn_write = cb_pcidda_ao_insn_write;
395 /* two 8255 digital io subdevices */
396 for (i = 0; i < 2; i++) {
397 s = &dev->subdevices[1 + i];
398 ret = subdev_8255_init(dev, s, NULL, iobase_8255 + (i * 4));
403 /* Read the caldac eeprom data */
404 for (i = 0; i < EEPROM_SIZE; i++)
405 devpriv->eeprom_data[i] = cb_pcidda_read_eeprom(dev, i);
407 /* set calibrations dacs */
408 for (i = 0; i < thisboard->ao_chans; i++)
409 cb_pcidda_calibrate(dev, i, devpriv->ao_range[i]);
411 dev_info(dev->class_dev, "%s attached\n", dev->board_name);
416 static void cb_pcidda_detach(struct comedi_device *dev)
418 struct pci_dev *pcidev = comedi_to_pci_dev(dev);
420 if (dev->subdevices) {
421 subdev_8255_cleanup(dev, &dev->subdevices[1]);
422 subdev_8255_cleanup(dev, &dev->subdevices[2]);
426 comedi_pci_disable(pcidev);
430 static struct comedi_driver cb_pcidda_driver = {
431 .driver_name = "cb_pcidda",
432 .module = THIS_MODULE,
433 .auto_attach = cb_pcidda_auto_attach,
434 .detach = cb_pcidda_detach,
437 static int cb_pcidda_pci_probe(struct pci_dev *dev,
438 const struct pci_device_id *ent)
440 return comedi_pci_auto_config(dev, &cb_pcidda_driver);
443 static DEFINE_PCI_DEVICE_TABLE(cb_pcidda_pci_table) = {
444 { PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_DDA02_12) },
445 { PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_DDA04_12) },
446 { PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_DDA08_12) },
447 { PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_DDA02_16) },
448 { PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_DDA04_16) },
449 { PCI_DEVICE(PCI_VENDOR_ID_CB, PCI_DEVICE_ID_DDA08_16) },
452 MODULE_DEVICE_TABLE(pci, cb_pcidda_pci_table);
454 static struct pci_driver cb_pcidda_pci_driver = {
456 .id_table = cb_pcidda_pci_table,
457 .probe = cb_pcidda_pci_probe,
458 .remove = comedi_pci_auto_unconfig,
460 module_comedi_pci_driver(cb_pcidda_driver, cb_pcidda_pci_driver);
462 MODULE_AUTHOR("Comedi http://www.comedi.org");
463 MODULE_DESCRIPTION("Comedi low-level driver");
464 MODULE_LICENSE("GPL");