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Linux/drivers/staging/comedi/drivers/cb_pcidda.c

  1 /*
  2  * comedi/drivers/cb_pcidda.c
  3  * Driver for the ComputerBoards / MeasurementComputing PCI-DDA series.
  4  *
  5  * Copyright (C) 2001 Ivan Martinez <ivanmr@altavista.com>
  6  * Copyright (C) 2001 Frank Mori Hess <fmhess@users.sourceforge.net>
  7  *
  8  * COMEDI - Linux Control and Measurement Device Interface
  9  * Copyright (C) 1997-8 David A. Schleef <ds@schleef.org>
 10  *
 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.
 15  *
 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.
 20  */
 21 
 22 /*
 23  * Driver: cb_pcidda
 24  * Description: MeasurementComputing PCI-DDA series
 25  * Devices: [Measurement Computing] PCI-DDA08/12 (pci-dda08/12),
 26  *   PCI-DDA04/12 (pci-dda04/12), PCI-DDA02/12 (pci-dda02/12),
 27  *   PCI-DDA08/16 (pci-dda08/16), PCI-DDA04/16 (pci-dda04/16),
 28  *   PCI-DDA02/16 (pci-dda02/16)
 29  * Author: Ivan Martinez <ivanmr@altavista.com>
 30  *         Frank Mori Hess <fmhess@users.sourceforge.net>
 31  * Status: works
 32  *
 33  * Configuration options: not applicable, uses PCI auto config
 34  *
 35  * Only simple analog output writing is supported.
 36  */
 37 
 38 #include <linux/module.h>
 39 
 40 #include "../comedi_pci.h"
 41 
 42 #include "8255.h"
 43 
 44 #define EEPROM_SIZE     128     /*  number of entries in eeprom */
 45 /* maximum number of ao channels for supported boards */
 46 #define MAX_AO_CHANNELS 8
 47 
 48 /* Digital I/O registers */
 49 #define CB_DDA_DIO0_8255_BASE           0x00
 50 #define CB_DDA_DIO1_8255_BASE           0x04
 51 
 52 /* DAC registers */
 53 #define CB_DDA_DA_CTRL_REG              0x00       /* D/A Control Register  */
 54 #define CB_DDA_DA_CTRL_SU               (1 << 0)   /*  Simultaneous update  */
 55 #define CB_DDA_DA_CTRL_EN               (1 << 1)   /*  Enable specified DAC */
 56 #define CB_DDA_DA_CTRL_DAC(x)           ((x) << 2) /*  Specify DAC channel  */
 57 #define CB_DDA_DA_CTRL_RANGE2V5         (0 << 6)   /*  2.5V range           */
 58 #define CB_DDA_DA_CTRL_RANGE5V          (2 << 6)   /*  5V range             */
 59 #define CB_DDA_DA_CTRL_RANGE10V         (3 << 6)   /*  10V range            */
 60 #define CB_DDA_DA_CTRL_UNIP             (1 << 8)   /*  Unipolar range       */
 61 
 62 #define DACALIBRATION1  4       /*  D/A CALIBRATION REGISTER 1 */
 63 /* write bits */
 64 /* serial data input for eeprom, caldacs, reference dac */
 65 #define SERIAL_IN_BIT   0x1
 66 #define CAL_CHANNEL_MASK        (0x7 << 1)
 67 #define CAL_CHANNEL_BITS(channel)       (((channel) << 1) & CAL_CHANNEL_MASK)
 68 /* read bits */
 69 #define CAL_COUNTER_MASK        0x1f
 70 /* calibration counter overflow status bit */
 71 #define CAL_COUNTER_OVERFLOW_BIT        0x20
 72 /* analog output is less than reference dac voltage */
 73 #define AO_BELOW_REF_BIT        0x40
 74 #define SERIAL_OUT_BIT  0x80    /*  serial data out, for reading from eeprom */
 75 
 76 #define DACALIBRATION2  6       /*  D/A CALIBRATION REGISTER 2 */
 77 #define SELECT_EEPROM_BIT       0x1     /*  send serial data in to eeprom */
 78 /* don't send serial data to MAX542 reference dac */
 79 #define DESELECT_REF_DAC_BIT    0x2
 80 /* don't send serial data to caldac n */
 81 #define DESELECT_CALDAC_BIT(n)  (0x4 << (n))
 82 /* manual says to set this bit with no explanation */
 83 #define DUMMY_BIT       0x40
 84 
 85 #define CB_DDA_DA_DATA_REG(x)           (0x08 + ((x) * 2))
 86 
 87 /* Offsets for the caldac channels */
 88 #define CB_DDA_CALDAC_FINE_GAIN         0
 89 #define CB_DDA_CALDAC_COURSE_GAIN       1
 90 #define CB_DDA_CALDAC_COURSE_OFFSET     2
 91 #define CB_DDA_CALDAC_FINE_OFFSET       3
 92 
 93 static const struct comedi_lrange cb_pcidda_ranges = {
 94         6, {
 95                 BIP_RANGE(10),
 96                 BIP_RANGE(5),
 97                 BIP_RANGE(2.5),
 98                 UNI_RANGE(10),
 99                 UNI_RANGE(5),
100                 UNI_RANGE(2.5)
101         }
102 };
103 
104 enum cb_pcidda_boardid {
105         BOARD_DDA02_12,
106         BOARD_DDA04_12,
107         BOARD_DDA08_12,
108         BOARD_DDA02_16,
109         BOARD_DDA04_16,
110         BOARD_DDA08_16,
111 };
112 
113 struct cb_pcidda_board {
114         const char *name;
115         int ao_chans;
116         int ao_bits;
117 };
118 
119 static const struct cb_pcidda_board cb_pcidda_boards[] = {
120         [BOARD_DDA02_12] = {
121                 .name           = "pci-dda02/12",
122                 .ao_chans       = 2,
123                 .ao_bits        = 12,
124         },
125         [BOARD_DDA04_12] = {
126                 .name           = "pci-dda04/12",
127                 .ao_chans       = 4,
128                 .ao_bits        = 12,
129         },
130         [BOARD_DDA08_12] = {
131                 .name           = "pci-dda08/12",
132                 .ao_chans       = 8,
133                 .ao_bits        = 12,
134         },
135         [BOARD_DDA02_16] = {
136                 .name           = "pci-dda02/16",
137                 .ao_chans       = 2,
138                 .ao_bits        = 16,
139         },
140         [BOARD_DDA04_16] = {
141                 .name           = "pci-dda04/16",
142                 .ao_chans       = 4,
143                 .ao_bits        = 16,
144         },
145         [BOARD_DDA08_16] = {
146                 .name           = "pci-dda08/16",
147                 .ao_chans       = 8,
148                 .ao_bits        = 16,
149         },
150 };
151 
152 struct cb_pcidda_private {
153         unsigned long daqio;
154         /* bits last written to da calibration register 1 */
155         unsigned int dac_cal1_bits;
156         /* current range settings for output channels */
157         unsigned int ao_range[MAX_AO_CHANNELS];
158         u16 eeprom_data[EEPROM_SIZE];   /*  software copy of board's eeprom */
159 };
160 
161 /* lowlevel read from eeprom */
162 static unsigned int cb_pcidda_serial_in(struct comedi_device *dev)
163 {
164         struct cb_pcidda_private *devpriv = dev->private;
165         unsigned int value = 0;
166         int i;
167         const int value_width = 16;     /*  number of bits wide values are */
168 
169         for (i = 1; i <= value_width; i++) {
170                 /*  read bits most significant bit first */
171                 if (inw_p(devpriv->daqio + DACALIBRATION1) & SERIAL_OUT_BIT)
172                         value |= 1 << (value_width - i);
173         }
174 
175         return value;
176 }
177 
178 /* lowlevel write to eeprom/dac */
179 static void cb_pcidda_serial_out(struct comedi_device *dev, unsigned int value,
180                                  unsigned int num_bits)
181 {
182         struct cb_pcidda_private *devpriv = dev->private;
183         int i;
184 
185         for (i = 1; i <= num_bits; i++) {
186                 /*  send bits most significant bit first */
187                 if (value & (1 << (num_bits - i)))
188                         devpriv->dac_cal1_bits |= SERIAL_IN_BIT;
189                 else
190                         devpriv->dac_cal1_bits &= ~SERIAL_IN_BIT;
191                 outw_p(devpriv->dac_cal1_bits, devpriv->daqio + DACALIBRATION1);
192         }
193 }
194 
195 /* reads a 16 bit value from board's eeprom */
196 static unsigned int cb_pcidda_read_eeprom(struct comedi_device *dev,
197                                           unsigned int address)
198 {
199         struct cb_pcidda_private *devpriv = dev->private;
200         unsigned int i;
201         unsigned int cal2_bits;
202         unsigned int value;
203         /* one caldac for every two dac channels */
204         const int max_num_caldacs = 4;
205         /* bits to send to tell eeprom we want to read */
206         const int read_instruction = 0x6;
207         const int instruction_length = 3;
208         const int address_length = 8;
209 
210         /*  send serial output stream to eeprom */
211         cal2_bits = SELECT_EEPROM_BIT | DESELECT_REF_DAC_BIT | DUMMY_BIT;
212         /*  deactivate caldacs (one caldac for every two channels) */
213         for (i = 0; i < max_num_caldacs; i++)
214                 cal2_bits |= DESELECT_CALDAC_BIT(i);
215         outw_p(cal2_bits, devpriv->daqio + DACALIBRATION2);
216 
217         /*  tell eeprom we want to read */
218         cb_pcidda_serial_out(dev, read_instruction, instruction_length);
219         /*  send address we want to read from */
220         cb_pcidda_serial_out(dev, address, address_length);
221 
222         value = cb_pcidda_serial_in(dev);
223 
224         /*  deactivate eeprom */
225         cal2_bits &= ~SELECT_EEPROM_BIT;
226         outw_p(cal2_bits, devpriv->daqio + DACALIBRATION2);
227 
228         return value;
229 }
230 
231 /* writes to 8 bit calibration dacs */
232 static void cb_pcidda_write_caldac(struct comedi_device *dev,
233                                    unsigned int caldac, unsigned int channel,
234                                    unsigned int value)
235 {
236         struct cb_pcidda_private *devpriv = dev->private;
237         unsigned int cal2_bits;
238         unsigned int i;
239         /* caldacs use 3 bit channel specification */
240         const int num_channel_bits = 3;
241         const int num_caldac_bits = 8;  /*  8 bit calibration dacs */
242         /* one caldac for every two dac channels */
243         const int max_num_caldacs = 4;
244 
245         /* write 3 bit channel */
246         cb_pcidda_serial_out(dev, channel, num_channel_bits);
247         /*  write 8 bit caldac value */
248         cb_pcidda_serial_out(dev, value, num_caldac_bits);
249 
250 /*
251 * latch stream into appropriate caldac deselect reference dac
252 */
253         cal2_bits = DESELECT_REF_DAC_BIT | DUMMY_BIT;
254         /*  deactivate caldacs (one caldac for every two channels) */
255         for (i = 0; i < max_num_caldacs; i++)
256                 cal2_bits |= DESELECT_CALDAC_BIT(i);
257         /*  activate the caldac we want */
258         cal2_bits &= ~DESELECT_CALDAC_BIT(caldac);
259         outw_p(cal2_bits, devpriv->daqio + DACALIBRATION2);
260         /*  deactivate caldac */
261         cal2_bits |= DESELECT_CALDAC_BIT(caldac);
262         outw_p(cal2_bits, devpriv->daqio + DACALIBRATION2);
263 }
264 
265 /* set caldacs to eeprom values for given channel and range */
266 static void cb_pcidda_calibrate(struct comedi_device *dev, unsigned int channel,
267                                 unsigned int range)
268 {
269         struct cb_pcidda_private *devpriv = dev->private;
270         unsigned int caldac = channel / 2;      /* two caldacs per channel */
271         unsigned int chan = 4 * (channel % 2);  /* caldac channel base */
272         unsigned int index = 2 * range + 12 * channel;
273         unsigned int offset;
274         unsigned int gain;
275 
276         /* save range so we can tell when we need to readjust calibration */
277         devpriv->ao_range[channel] = range;
278 
279         /* get values from eeprom data */
280         offset = devpriv->eeprom_data[0x7 + index];
281         gain = devpriv->eeprom_data[0x8 + index];
282 
283         /* set caldacs */
284         cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_COURSE_OFFSET,
285                                (offset >> 8) & 0xff);
286         cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_FINE_OFFSET,
287                                offset & 0xff);
288         cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_COURSE_GAIN,
289                                (gain >> 8) & 0xff);
290         cb_pcidda_write_caldac(dev, caldac, chan + CB_DDA_CALDAC_FINE_GAIN,
291                                gain & 0xff);
292 }
293 
294 static int cb_pcidda_ao_insn_write(struct comedi_device *dev,
295                                    struct comedi_subdevice *s,
296                                    struct comedi_insn *insn,
297                                    unsigned int *data)
298 {
299         struct cb_pcidda_private *devpriv = dev->private;
300         unsigned int channel = CR_CHAN(insn->chanspec);
301         unsigned int range = CR_RANGE(insn->chanspec);
302         unsigned int ctrl;
303 
304         if (range != devpriv->ao_range[channel])
305                 cb_pcidda_calibrate(dev, channel, range);
306 
307         ctrl = CB_DDA_DA_CTRL_EN | CB_DDA_DA_CTRL_DAC(channel);
308 
309         switch (range) {
310         case 0:
311         case 3:
312                 ctrl |= CB_DDA_DA_CTRL_RANGE10V;
313                 break;
314         case 1:
315         case 4:
316                 ctrl |= CB_DDA_DA_CTRL_RANGE5V;
317                 break;
318         case 2:
319         case 5:
320                 ctrl |= CB_DDA_DA_CTRL_RANGE2V5;
321                 break;
322         }
323 
324         if (range > 2)
325                 ctrl |= CB_DDA_DA_CTRL_UNIP;
326 
327         outw(ctrl, devpriv->daqio + CB_DDA_DA_CTRL_REG);
328 
329         outw(data[0], devpriv->daqio + CB_DDA_DA_DATA_REG(channel));
330 
331         return insn->n;
332 }
333 
334 static int cb_pcidda_auto_attach(struct comedi_device *dev,
335                                  unsigned long context)
336 {
337         struct pci_dev *pcidev = comedi_to_pci_dev(dev);
338         const struct cb_pcidda_board *thisboard = NULL;
339         struct cb_pcidda_private *devpriv;
340         struct comedi_subdevice *s;
341         int i;
342         int ret;
343 
344         if (context < ARRAY_SIZE(cb_pcidda_boards))
345                 thisboard = &cb_pcidda_boards[context];
346         if (!thisboard)
347                 return -ENODEV;
348         dev->board_ptr = thisboard;
349         dev->board_name = thisboard->name;
350 
351         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
352         if (!devpriv)
353                 return -ENOMEM;
354 
355         ret = comedi_pci_enable(dev);
356         if (ret)
357                 return ret;
358         dev->iobase = pci_resource_start(pcidev, 2);
359         devpriv->daqio = pci_resource_start(pcidev, 3);
360 
361         ret = comedi_alloc_subdevices(dev, 3);
362         if (ret)
363                 return ret;
364 
365         s = &dev->subdevices[0];
366         /* analog output subdevice */
367         s->type = COMEDI_SUBD_AO;
368         s->subdev_flags = SDF_WRITABLE;
369         s->n_chan = thisboard->ao_chans;
370         s->maxdata = (1 << thisboard->ao_bits) - 1;
371         s->range_table = &cb_pcidda_ranges;
372         s->insn_write = cb_pcidda_ao_insn_write;
373 
374         /* two 8255 digital io subdevices */
375         for (i = 0; i < 2; i++) {
376                 s = &dev->subdevices[1 + i];
377                 ret = subdev_8255_init(dev, s, NULL, i * I8255_SIZE);
378                 if (ret)
379                         return ret;
380         }
381 
382         /* Read the caldac eeprom data */
383         for (i = 0; i < EEPROM_SIZE; i++)
384                 devpriv->eeprom_data[i] = cb_pcidda_read_eeprom(dev, i);
385 
386         /*  set calibrations dacs */
387         for (i = 0; i < thisboard->ao_chans; i++)
388                 cb_pcidda_calibrate(dev, i, devpriv->ao_range[i]);
389 
390         return 0;
391 }
392 
393 static struct comedi_driver cb_pcidda_driver = {
394         .driver_name    = "cb_pcidda",
395         .module         = THIS_MODULE,
396         .auto_attach    = cb_pcidda_auto_attach,
397         .detach         = comedi_pci_detach,
398 };
399 
400 static int cb_pcidda_pci_probe(struct pci_dev *dev,
401                                const struct pci_device_id *id)
402 {
403         return comedi_pci_auto_config(dev, &cb_pcidda_driver,
404                                       id->driver_data);
405 }
406 
407 static const struct pci_device_id cb_pcidda_pci_table[] = {
408         { PCI_VDEVICE(CB, 0x0020), BOARD_DDA02_12 },
409         { PCI_VDEVICE(CB, 0x0021), BOARD_DDA04_12 },
410         { PCI_VDEVICE(CB, 0x0022), BOARD_DDA08_12 },
411         { PCI_VDEVICE(CB, 0x0023), BOARD_DDA02_16 },
412         { PCI_VDEVICE(CB, 0x0024), BOARD_DDA04_16 },
413         { PCI_VDEVICE(CB, 0x0025), BOARD_DDA08_16 },
414         { 0 }
415 };
416 MODULE_DEVICE_TABLE(pci, cb_pcidda_pci_table);
417 
418 static struct pci_driver cb_pcidda_pci_driver = {
419         .name           = "cb_pcidda",
420         .id_table       = cb_pcidda_pci_table,
421         .probe          = cb_pcidda_pci_probe,
422         .remove         = comedi_pci_auto_unconfig,
423 };
424 module_comedi_pci_driver(cb_pcidda_driver, cb_pcidda_pci_driver);
425 
426 MODULE_AUTHOR("Comedi http://www.comedi.org");
427 MODULE_DESCRIPTION("Comedi low-level driver");
428 MODULE_LICENSE("GPL");
429 

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