das6402.c revision 0a85b6f0ab0d2edb0d41b32697111ce0e4f43496 
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/*
32Driver: das6402
33Description: Keithley Metrabyte DAS6402 (& compatibles)
34Author: Oystein Svendsen <svendsen@pvv.org>
35Status: bitrotten
36Devices: [Keithley Metrabyte] DAS6402 (das6402)
37
38This 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
102static int das6402_attach(struct comedi_device *dev,
103			  struct comedi_devconfig *it);
104static int das6402_detach(struct comedi_device *dev);
105static struct comedi_driver driver_das6402 = {
106	.driver_name = "das6402",
107	.module = THIS_MODULE,
108	.attach = das6402_attach,
109	.detach = das6402_detach,
110};
111
112COMEDI_INITCLEANUP(driver_das6402);
113
114struct das6402_private {
115	int ai_bytes_to_read;
116
117	int das6402_ignoreirq;
118};
119#define devpriv ((struct das6402_private *)dev->private)
120
121static void das6402_ai_fifo_dregs(struct comedi_device *dev,
122				  struct comedi_subdevice *s);
123
124static 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
157static 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
192static 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
201static 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
211static 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
234static 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
257static 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
297static 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
307static 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}
363