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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  *          (Measurement Computing) PCI-DDA04/12 [pci-dda04/12]
 27  *          (Measurement Computing) PCI-DDA02/12 [pci-dda02/12]
 28  *          (Measurement Computing) PCI-DDA08/16 [pci-dda08/16]
 29  *          (Measurement Computing) PCI-DDA04/16 [pci-dda04/16]
 30  *          (Measurement Computing) PCI-DDA02/16 [pci-dda02/16]
 31  * Author: Ivan Martinez <ivanmr@altavista.com>
 32  *         Frank Mori Hess <fmhess@users.sourceforge.net>
 33  * Status: works
 34  *
 35  * Configuration options: not applicable, uses PCI auto config
 36  *
 37  * Only simple analog output writing is supported.
 38  */
 39 
 40 #include <linux/module.h>
 41 #include <linux/pci.h>
 42 
 43 #include "../comedidev.h"
 44 
 45 #include "comedi_fc.h"
 46 #include "8255.h"
 47 
 48 #define EEPROM_SIZE     128     /*  number of entries in eeprom */
 49 /* maximum number of ao channels for supported boards */
 50 #define MAX_AO_CHANNELS 8
 51 
 52 /* Digital I/O registers */
 53 #define CB_DDA_DIO0_8255_BASE           0x00
 54 #define CB_DDA_DIO1_8255_BASE           0x04
 55 
 56 /* DAC registers */
 57 #define CB_DDA_DA_CTRL_REG              0x00       /* D/A Control Register  */
 58 #define CB_DDA_DA_CTRL_SU               (1 << 0)   /*  Simultaneous update  */
 59 #define CB_DDA_DA_CTRL_EN               (1 << 1)   /*  Enable specified DAC */
 60 #define CB_DDA_DA_CTRL_DAC(x)           ((x) << 2) /*  Specify DAC channel  */
 61 #define CB_DDA_DA_CTRL_RANGE2V5         (0 << 6)   /*  2.5V range           */
 62 #define CB_DDA_DA_CTRL_RANGE5V          (2 << 6)   /*  5V range             */
 63 #define CB_DDA_DA_CTRL_RANGE10V         (3 << 6)   /*  10V range            */
 64 #define CB_DDA_DA_CTRL_UNIP             (1 << 8)   /*  Unipolar range       */
 65 
 66 #define DACALIBRATION1  4       /*  D/A CALIBRATION REGISTER 1 */
 67 /* write bits */
 68 /* serial data input for eeprom, caldacs, reference dac */
 69 #define SERIAL_IN_BIT   0x1
 70 #define CAL_CHANNEL_MASK        (0x7 << 1)
 71 #define CAL_CHANNEL_BITS(channel)       (((channel) << 1) & CAL_CHANNEL_MASK)
 72 /* read bits */
 73 #define CAL_COUNTER_MASK        0x1f
 74 /* calibration counter overflow status bit */
 75 #define CAL_COUNTER_OVERFLOW_BIT        0x20
 76 /* analog output is less than reference dac voltage */
 77 #define AO_BELOW_REF_BIT        0x40
 78 #define SERIAL_OUT_BIT  0x80    /*  serial data out, for reading from eeprom */
 79 
 80 #define DACALIBRATION2  6       /*  D/A CALIBRATION REGISTER 2 */
 81 #define SELECT_EEPROM_BIT       0x1     /*  send serial data in to eeprom */
 82 /* don't send serial data to MAX542 reference dac */
 83 #define DESELECT_REF_DAC_BIT    0x2
 84 /* don't send serial data to caldac n */
 85 #define DESELECT_CALDAC_BIT(n)  (0x4 << (n))
 86 /* manual says to set this bit with no explanation */
 87 #define DUMMY_BIT       0x40
 88 
 89 #define CB_DDA_DA_DATA_REG(x)           (0x08 + ((x) * 2))
 90 
 91 /* Offsets for the caldac channels */
 92 #define CB_DDA_CALDAC_FINE_GAIN         0
 93 #define CB_DDA_CALDAC_COURSE_GAIN       1
 94 #define CB_DDA_CALDAC_COURSE_OFFSET     2
 95 #define CB_DDA_CALDAC_FINE_OFFSET       3
 96 
 97 static const struct comedi_lrange cb_pcidda_ranges = {
 98         6, {
 99                 BIP_RANGE(10),
100                 BIP_RANGE(5),
101                 BIP_RANGE(2.5),
102                 UNI_RANGE(10),
103                 UNI_RANGE(5),
104                 UNI_RANGE(2.5)
105         }
106 };
107 
108 enum cb_pcidda_boardid {
109         BOARD_DDA02_12,
110         BOARD_DDA04_12,
111         BOARD_DDA08_12,
112         BOARD_DDA02_16,
113         BOARD_DDA04_16,
114         BOARD_DDA08_16,
115 };
116 
117 struct cb_pcidda_board {
118         const char *name;
119         int ao_chans;
120         int ao_bits;
121 };
122 
123 static const struct cb_pcidda_board cb_pcidda_boards[] = {
124         [BOARD_DDA02_12] = {
125                 .name           = "pci-dda02/12",
126                 .ao_chans       = 2,
127                 .ao_bits        = 12,
128         },
129         [BOARD_DDA04_12] = {
130                 .name           = "pci-dda04/12",
131                 .ao_chans       = 4,
132                 .ao_bits        = 12,
133         },
134         [BOARD_DDA08_12] = {
135                 .name           = "pci-dda08/12",
136                 .ao_chans       = 8,
137                 .ao_bits        = 12,
138         },
139         [BOARD_DDA02_16] = {
140                 .name           = "pci-dda02/16",
141                 .ao_chans       = 2,
142                 .ao_bits        = 16,
143         },
144         [BOARD_DDA04_16] = {
145                 .name           = "pci-dda04/16",
146                 .ao_chans       = 4,
147                 .ao_bits        = 16,
148         },
149         [BOARD_DDA08_16] = {
150                 .name           = "pci-dda08/16",
151                 .ao_chans       = 8,
152                 .ao_bits        = 16,
153         },
154 };
155 
156 struct cb_pcidda_private {
157         /* bits last written to da calibration register 1 */
158         unsigned int dac_cal1_bits;
159         /* current range settings for output channels */
160         unsigned int ao_range[MAX_AO_CHANNELS];
161         u16 eeprom_data[EEPROM_SIZE];   /*  software copy of board's eeprom */
162 };
163 
164 /* lowlevel read from eeprom */
165 static unsigned int cb_pcidda_serial_in(struct comedi_device *dev)
166 {
167         unsigned int value = 0;
168         int i;
169         const int value_width = 16;     /*  number of bits wide values are */
170 
171         for (i = 1; i <= value_width; i++) {
172                 /*  read bits most significant bit first */
173                 if (inw_p(dev->iobase + DACALIBRATION1) & SERIAL_OUT_BIT)
174                         value |= 1 << (value_width - i);
175         }
176 
177         return value;
178 }
179 
180 /* lowlevel write to eeprom/dac */
181 static void cb_pcidda_serial_out(struct comedi_device *dev, unsigned int value,
182                                  unsigned int num_bits)
183 {
184         struct cb_pcidda_private *devpriv = dev->private;
185         int i;
186 
187         for (i = 1; i <= num_bits; i++) {
188                 /*  send bits most significant bit first */
189                 if (value & (1 << (num_bits - i)))
190                         devpriv->dac_cal1_bits |= SERIAL_IN_BIT;
191                 else
192                         devpriv->dac_cal1_bits &= ~SERIAL_IN_BIT;
193                 outw_p(devpriv->dac_cal1_bits, dev->iobase + DACALIBRATION1);
194         }
195 }
196 
197 /* reads a 16 bit value from board's eeprom */
198 static unsigned int cb_pcidda_read_eeprom(struct comedi_device *dev,
199                                           unsigned int address)
200 {
201         unsigned int i;
202         unsigned int cal2_bits;
203         unsigned int value;
204         /* one caldac for every two dac channels */
205         const int max_num_caldacs = 4;
206         /* bits to send to tell eeprom we want to read */
207         const int read_instruction = 0x6;
208         const int instruction_length = 3;
209         const int address_length = 8;
210 
211         /*  send serial output stream to eeprom */
212         cal2_bits = SELECT_EEPROM_BIT | DESELECT_REF_DAC_BIT | DUMMY_BIT;
213         /*  deactivate caldacs (one caldac for every two channels) */
214         for (i = 0; i < max_num_caldacs; i++)
215                 cal2_bits |= DESELECT_CALDAC_BIT(i);
216         outw_p(cal2_bits, dev->iobase + DACALIBRATION2);
217 
218         /*  tell eeprom we want to read */
219         cb_pcidda_serial_out(dev, read_instruction, instruction_length);
220         /*  send address we want to read from */
221         cb_pcidda_serial_out(dev, address, address_length);
222 
223         value = cb_pcidda_serial_in(dev);
224 
225         /*  deactivate eeprom */
226         cal2_bits &= ~SELECT_EEPROM_BIT;
227         outw_p(cal2_bits, dev->iobase + DACALIBRATION2);
228 
229         return value;
230 }
231 
232 /* writes to 8 bit calibration dacs */
233 static void cb_pcidda_write_caldac(struct comedi_device *dev,
234                                    unsigned int caldac, unsigned int channel,
235                                    unsigned int value)
236 {
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, dev->iobase + DACALIBRATION2);
260         /*  deactivate caldac */
261         cal2_bits |= DESELECT_CALDAC_BIT(caldac);
262         outw_p(cal2_bits, dev->iobase + 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, dev->iobase + CB_DDA_DA_CTRL_REG);
328 
329         outw(data[0], dev->iobase + 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         unsigned long iobase_8255;
342         int i;
343         int ret;
344 
345         if (context < ARRAY_SIZE(cb_pcidda_boards))
346                 thisboard = &cb_pcidda_boards[context];
347         if (!thisboard)
348                 return -ENODEV;
349         dev->board_ptr = thisboard;
350         dev->board_name = thisboard->name;
351 
352         devpriv = comedi_alloc_devpriv(dev, sizeof(*devpriv));
353         if (!devpriv)
354                 return -ENOMEM;
355 
356         ret = comedi_pci_enable(dev);
357         if (ret)
358                 return ret;
359         dev->iobase = pci_resource_start(pcidev, 3);
360         iobase_8255 = pci_resource_start(pcidev, 2);
361 
362         ret = comedi_alloc_subdevices(dev, 3);
363         if (ret)
364                 return ret;
365 
366         s = &dev->subdevices[0];
367         /* analog output subdevice */
368         s->type = COMEDI_SUBD_AO;
369         s->subdev_flags = SDF_WRITABLE;
370         s->n_chan = thisboard->ao_chans;
371         s->maxdata = (1 << thisboard->ao_bits) - 1;
372         s->range_table = &cb_pcidda_ranges;
373         s->insn_write = cb_pcidda_ao_insn_write;
374 
375         /* two 8255 digital io subdevices */
376         for (i = 0; i < 2; i++) {
377                 s = &dev->subdevices[1 + i];
378                 ret = subdev_8255_init(dev, s, NULL, iobase_8255 + (i * 4));
379                 if (ret)
380                         return ret;
381         }
382 
383         /* Read the caldac eeprom data */
384         for (i = 0; i < EEPROM_SIZE; i++)
385                 devpriv->eeprom_data[i] = cb_pcidda_read_eeprom(dev, i);
386 
387         /*  set calibrations dacs */
388         for (i = 0; i < thisboard->ao_chans; i++)
389                 cb_pcidda_calibrate(dev, i, devpriv->ao_range[i]);
390 
391         return 0;
392 }
393 
394 static struct comedi_driver cb_pcidda_driver = {
395         .driver_name    = "cb_pcidda",
396         .module         = THIS_MODULE,
397         .auto_attach    = cb_pcidda_auto_attach,
398         .detach         = comedi_pci_disable,
399 };
400 
401 static int cb_pcidda_pci_probe(struct pci_dev *dev,
402                                const struct pci_device_id *id)
403 {
404         return comedi_pci_auto_config(dev, &cb_pcidda_driver,
405                                       id->driver_data);
406 }
407 
408 static const struct pci_device_id cb_pcidda_pci_table[] = {
409         { PCI_VDEVICE(CB, 0x0020), BOARD_DDA02_12 },
410         { PCI_VDEVICE(CB, 0x0021), BOARD_DDA04_12 },
411         { PCI_VDEVICE(CB, 0x0022), BOARD_DDA08_12 },
412         { PCI_VDEVICE(CB, 0x0023), BOARD_DDA02_16 },
413         { PCI_VDEVICE(CB, 0x0024), BOARD_DDA04_16 },
414         { PCI_VDEVICE(CB, 0x0025), BOARD_DDA08_16 },
415         { 0 }
416 };
417 MODULE_DEVICE_TABLE(pci, cb_pcidda_pci_table);
418 
419 static struct pci_driver cb_pcidda_pci_driver = {
420         .name           = "cb_pcidda",
421         .id_table       = cb_pcidda_pci_table,
422         .probe          = cb_pcidda_pci_probe,
423         .remove         = comedi_pci_auto_unconfig,
424 };
425 module_comedi_pci_driver(cb_pcidda_driver, cb_pcidda_pci_driver);
426 
427 MODULE_AUTHOR("Comedi http://www.comedi.org");
428 MODULE_DESCRIPTION("Comedi low-level driver");
429 MODULE_LICENSE("GPL");
430 

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