drivers/staging/comedi/drivers/das6402.c

   1 /*
   2    Some comments on the code..
   3
   4    - it shouldn't be necessary to use outb_p().
   5
   6    - ignoreirq creates a race condition.  It needs to be fixed.
   7
   8  */
   9
  10 /*
  11    comedi/drivers/das6402.c
  12    An experimental driver for Computerboards' DAS6402 I/O card
  13
  14    Copyright (C) 1999 Oystein Svendsen <svendsen@pvv.org>
  15
  16    This program is free software; you can redistribute it and/or modify
  17    it under the terms of the GNU General Public License as published by
  18    the Free Software Foundation; either version 2 of the License, or
  19    (at your option) any later version.
  20
  21    This program is distributed in the hope that it will be useful,
  22    but WITHOUT ANY WARRANTY; without even the implied warranty of
  23    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  24    GNU General Public License for more details.
  25
  26    You should have received a copy of the GNU General Public License
  27    along with this program; if not, write to the Free Software
  28    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  29
  30  */
  31 /*
  32 Driver: das6402
  33 Description: Keithley Metrabyte DAS6402 (& compatibles)
  34 Author: Oystein Svendsen <svendsen@pvv.org>
  35 Status: bitrotten
  36 Devices: [Keithley Metrabyte] DAS6402 (das6402)
  37
  38 This driver has suffered bitrot.
  39 */
  40
  41 #include <linux/interrupt.h>
  42 #include "../comedidev.h"
  43
  44 #include <linux/ioport.h>
  45
  46 #define DAS6402_SIZE 16
  47
  48 #define N_WORDS (3000*64)
  49
  50 #define STOP    0
  51 #define START   1
  52
  53 #define SCANL 0x3f00
  54 #define BYTE unsigned char
  55 #define WORD unsigned short
  56
  57 /*----- register 8 ----*/
  58 #define CLRINT 0x01
  59 #define CLRXTR 0x02
  60 #define CLRXIN 0x04
  61 #define EXTEND 0x10
  62 #define ARMED 0x20              /* enable conting of post sample conv */
  63 #define POSTMODE 0x40
  64 #define MHZ 0x80                /* 10 MHz clock */
  65 /*---------------------*/
  66
  67 /*----- register 9 ----*/
  68 #define IRQ (0x04 << 4)         /* these two are                         */
  69 #define IRQV 10                 /*               dependent on each other */
  70
  71 #define CONVSRC 0x03            /* trig src is Intarnal pacer */
  72 #define BURSTEN 0x04            /* enable burst */
  73 #define XINTE 0x08              /* use external int. trig */
  74 #define INTE 0x80               /* enable analog interrupts */
  75 /*---------------------*/
  76
  77 /*----- register 10 ---*/
  78 #define TGEN 0x01               /* Use pin DI1 for externl trigging? */
  79 #define TGSEL 0x02              /* Use edge triggering */
  80 #define TGPOL 0x04              /* active edge is falling */
  81 #define PRETRIG 0x08            /* pretrig */
  82 /*---------------------*/
  83
  84 /*----- register 11 ---*/
  85 #define EOB 0x0c
  86 #define FIFOHFULL 0x08
  87 #define GAIN 0x01
  88 #define FIFONEPTY 0x04
  89 #define MODE 0x10
  90 #define SEM 0x20
  91 #define BIP 0x40
  92 /*---------------------*/
  93
  94 #define M0 0x00
  95 #define M2 0x04
  96
  97 #define C0 0x00
  98 #define C1 0x40
  99 #define C2 0x80
 100 #define RWLH 0x30
 101
 102 static int das6402_attach(struct comedi_device *dev,
 103                           struct comedi_devconfig *it);
 104 static int das6402_detach(struct comedi_device *dev);
 105 static struct comedi_driver driver_das6402 = {
 106         .driver_name = "das6402",
 107         .module = THIS_MODULE,
 108         .attach = das6402_attach,
 109         .detach = das6402_detach,
 110 };
 111
 112 COMEDI_INITCLEANUP(driver_das6402);
 113
 114 struct das6402_private {
 115         int ai_bytes_to_read;
 116
 117         int das6402_ignoreirq;
 118 };
 119 #define devpriv ((struct das6402_private *)dev->private)
 120
 121 static void das6402_ai_fifo_dregs(struct comedi_device *dev,
 122                                   struct comedi_subdevice *s);
 123
 124 static void das6402_setcounter(struct comedi_device *dev)
 125 {
 126         BYTE p;
 127         unsigned short ctrlwrd;
 128
 129         /* set up counter0 first, mode 0 */
 130         p = M0 | C0 | RWLH;
 131         outb_p(p, dev->iobase + 15);
 132         ctrlwrd = 2000;
 133         p = (BYTE) (0xff & ctrlwrd);
 134         outb_p(p, dev->iobase + 12);
 135         p = (BYTE) (0xff & (ctrlwrd >> 8));
 136         outb_p(p, dev->iobase + 12);
 137
 138         /* set up counter1, mode 2 */
 139         p = M2 | C1 | RWLH;
 140         outb_p(p, dev->iobase + 15);
 141         ctrlwrd = 10;
 142         p = (BYTE) (0xff & ctrlwrd);
 143         outb_p(p, dev->iobase + 13);
 144         p = (BYTE) (0xff & (ctrlwrd >> 8));
 145         outb_p(p, dev->iobase + 13);
 146
 147         /* set up counter1, mode 2 */
 148         p = M2 | C2 | RWLH;
 149         outb_p(p, dev->iobase + 15);
 150         ctrlwrd = 1000;
 151         p = (BYTE) (0xff & ctrlwrd);
 152         outb_p(p, dev->iobase + 14);
 153         p = (BYTE) (0xff & (ctrlwrd >> 8));
 154         outb_p(p, dev->iobase + 14);
 155 }
 156
 157 static irqreturn_t intr_handler(int irq, void *d)
 158 {
 159         struct comedi_device *dev = d;
 160         struct comedi_subdevice *s = dev->subdevices;
 161
 162         if (!dev->attached || devpriv->das6402_ignoreirq) {
 163                 printk("das6402: BUG: spurious interrupt\n");
 164                 return IRQ_HANDLED;
 165         }
 166 #ifdef DEBUG
 167         printk("das6402: interrupt! das6402_irqcount=%i\n",
 168                devpriv->das6402_irqcount);
 169         printk("das6402: iobase+2=%i\n", inw_p(dev->iobase + 2));
 170 #endif
 171
 172         das6402_ai_fifo_dregs(dev, s);
 173
 174         if (s->async->buf_write_count >= devpriv->ai_bytes_to_read) {
 175                 outw_p(SCANL, dev->iobase + 2); /* clears the fifo */
 176                 outb(0x07, dev->iobase + 8);    /* clears all flip-flops */
 177 #ifdef DEBUG
 178                 printk("das6402: Got %i samples\n\n",
 179                        devpriv->das6402_wordsread - diff);
 180 #endif
 181                 s->async->events |= COMEDI_CB_EOA;
 182                 comedi_event(dev, s);
 183         }
 184
 185         outb(0x01, dev->iobase + 8);    /* clear only the interrupt flip-flop */
 186
 187         comedi_event(dev, s);
 188         return IRQ_HANDLED;
 189 }
 190
 191 #if 0
 192 static void das6402_ai_fifo_read(struct comedi_device *dev, short *data, int n)
 193 {
 194         int i;
 195
 196         for (i = 0; i < n; i++)
 197                 data[i] = inw(dev->iobase);
 198 }
 199 #endif
 200
 201 static void das6402_ai_fifo_dregs(struct comedi_device *dev,
 202                                   struct comedi_subdevice *s)
 203 {
 204         while (1) {
 205                 if (!(inb(dev->iobase + 8) & 0x01))
 206                         return;
 207                 comedi_buf_put(s->async, inw(dev->iobase));
 208         }
 209 }
 210
 211 static int das6402_ai_cancel(struct comedi_device *dev,
 212                              struct comedi_subdevice *s)
 213 {
 214         /*
 215          *  This function should reset the board from whatever condition it
 216          *  is in (i.e., acquiring data), to a non-active state.
 217          */
 218
 219         devpriv->das6402_ignoreirq = 1;
 220 #ifdef DEBUG
 221         printk("das6402: Stopping acquisition\n");
 222 #endif
 223         devpriv->das6402_ignoreirq = 1;
 224         outb_p(0x02, dev->iobase + 10); /* disable external trigging */
 225         outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
 226         outb_p(0, dev->iobase + 9);     /* disables interrupts */
 227
 228         outw_p(SCANL, dev->iobase + 2);
 229
 230         return 0;
 231 }
 232
 233 #ifdef unused
 234 static int das6402_ai_mode2(struct comedi_device *dev,
 235                             struct comedi_subdevice *s, comedi_trig * it)
 236 {
 237         devpriv->das6402_ignoreirq = 1;
 238
 239 #ifdef DEBUG
 240         printk("das6402: Starting acquisition\n");
 241 #endif
 242         outb_p(0x03, dev->iobase + 10); /* enable external trigging */
 243         outw_p(SCANL, dev->iobase + 2); /* resets the card fifo */
 244         outb_p(IRQ | CONVSRC | BURSTEN | INTE, dev->iobase + 9);
 245
 246         devpriv->ai_bytes_to_read = it->n * sizeof(short);
 247
 248         /* um... ignoreirq is a nasty race condition */
 249         devpriv->das6402_ignoreirq = 0;
 250
 251         outw_p(SCANL, dev->iobase + 2);
 252
 253         return 0;
 254 }
 255 #endif
 256
 257 static int board_init(struct comedi_device *dev)
 258 {
 259         BYTE b;
 260
 261         devpriv->das6402_ignoreirq = 1;
 262
 263         outb(0x07, dev->iobase + 8);
 264
 265         /* register 11  */
 266         outb_p(MODE, dev->iobase + 11);
 267         b = BIP | SEM | MODE | GAIN | FIFOHFULL;
 268         outb_p(b, dev->iobase + 11);
 269
 270         /* register 8   */
 271         outb_p(EXTEND, dev->iobase + 8);
 272         b = EXTEND | MHZ;
 273         outb_p(b, dev->iobase + 8);
 274         b = MHZ | CLRINT | CLRXTR | CLRXIN;
 275         outb_p(b, dev->iobase + 8);
 276
 277         /* register 9    */
 278         b = IRQ | CONVSRC | BURSTEN | INTE;
 279         outb_p(b, dev->iobase + 9);
 280
 281         /* register 10   */
 282         b = TGSEL | TGEN;
 283         outb_p(b, dev->iobase + 10);
 284
 285         b = 0x07;
 286         outb_p(b, dev->iobase + 8);
 287
 288         das6402_setcounter(dev);
 289
 290         outw_p(SCANL, dev->iobase + 2); /* reset card fifo */
 291
 292         devpriv->das6402_ignoreirq = 0;
 293
 294         return 0;
 295 }
 296
 297 static int das6402_detach(struct comedi_device *dev)
 298 {
 299         if (dev->irq)
 300                 free_irq(dev->irq, dev);
 301         if (dev->iobase)
 302                 release_region(dev->iobase, DAS6402_SIZE);
 303
 304         return 0;
 305 }
 306
 307 static int das6402_attach(struct comedi_device *dev,
 308                           struct comedi_devconfig *it)
 309 {
 310         unsigned int irq;
 311         unsigned long iobase;
 312         int ret;
 313         struct comedi_subdevice *s;
 314
 315         dev->board_name = "das6402";
 316
 317         iobase = it->options[0];
 318         if (iobase == 0)
 319                 iobase = 0x300;
 320
 321         printk("comedi%d: das6402: 0x%04lx", dev->minor, iobase);
 322
 323         if (!request_region(iobase, DAS6402_SIZE, "das6402")) {
 324                 printk(" I/O port conflict\n");
 325                 return -EIO;
 326         }
 327         dev->iobase = iobase;
 328
 329         /* should do a probe here */
 330
 331         irq = it->options[0];
 332         printk(" ( irq = %u )", irq);
 333         ret = request_irq(irq, intr_handler, 0, "das6402", dev);
 334         if (ret < 0) {
 335                 printk("irq conflict\n");
 336                 return ret;
 337         }
 338         dev->irq = irq;
 339
 340         ret = alloc_private(dev, sizeof(struct das6402_private));
 341         if (ret < 0)
 342                 return ret;
 343
 344         ret = alloc_subdevices(dev, 1);
 345         if (ret < 0)
 346                 return ret;
 347
 348         /* ai subdevice */
 349         s = dev->subdevices + 0;
 350         s->type = COMEDI_SUBD_AI;
 351         s->subdev_flags = SDF_READABLE | SDF_GROUND;
 352         s->n_chan = 8;
 353         /* s->trig[2]=das6402_ai_mode2; */
 354         s->cancel = das6402_ai_cancel;
 355         s->maxdata = (1 << 12) - 1;
 356         s->len_chanlist = 16;   /* ? */
 357         s->range_table = &range_unknown;
 358
 359         board_init(dev);
 360
 361         return 0;
 362 }