das6402.c revision 25436dc9d84f1be60ff549c9ab712bba2835f284 
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, struct comedi_devconfig *it);
103static int das6402_detach(struct comedi_device *dev);
104static struct comedi_driver driver_das6402 = {
105	.driver_name = "das6402",
106	.module = THIS_MODULE,
107	.attach = das6402_attach,
108	.detach = das6402_detach,
109};
110
111COMEDI_INITCLEANUP(driver_das6402);
112
113struct das6402_private {
114	int ai_bytes_to_read;
115
116	int das6402_ignoreirq;
117};
118#define devpriv ((struct das6402_private *)dev->private)
119
120static void das6402_ai_fifo_dregs(struct comedi_device *dev, struct comedi_subdevice *s);
121
122static void das6402_setcounter(struct comedi_device *dev)
123{
124	BYTE p;
125	unsigned short ctrlwrd;
126
127	/* set up counter0 first, mode 0 */
128	p = M0 | C0 | RWLH;
129	outb_p(p, dev->iobase + 15);
130	ctrlwrd = 2000;
131	p = (BYTE) (0xff & ctrlwrd);
132	outb_p(p, dev->iobase + 12);
133	p = (BYTE) (0xff & (ctrlwrd >> 8));
134	outb_p(p, dev->iobase + 12);
135
136	/* set up counter1, mode 2 */
137	p = M2 | C1 | RWLH;
138	outb_p(p, dev->iobase + 15);
139	ctrlwrd = 10;
140	p = (BYTE) (0xff & ctrlwrd);
141	outb_p(p, dev->iobase + 13);
142	p = (BYTE) (0xff & (ctrlwrd >> 8));
143	outb_p(p, dev->iobase + 13);
144
145	/* set up counter1, mode 2 */
146	p = M2 | C2 | RWLH;
147	outb_p(p, dev->iobase + 15);
148	ctrlwrd = 1000;
149	p = (BYTE) (0xff & ctrlwrd);
150	outb_p(p, dev->iobase + 14);
151	p = (BYTE) (0xff & (ctrlwrd >> 8));
152	outb_p(p, dev->iobase + 14);
153}
154
155static irqreturn_t intr_handler(int irq, void *d)
156{
157	struct comedi_device *dev = d;
158	struct comedi_subdevice *s = dev->subdevices;
159
160	if (!dev->attached || devpriv->das6402_ignoreirq) {
161		printk("das6402: BUG: spurious interrupt\n");
162		return IRQ_HANDLED;
163	}
164#ifdef DEBUG
165	printk("das6402: interrupt! das6402_irqcount=%i\n",
166		devpriv->das6402_irqcount);
167	printk("das6402: iobase+2=%i\n", inw_p(dev->iobase + 2));
168#endif
169
170	das6402_ai_fifo_dregs(dev, s);
171
172	if (s->async->buf_write_count >= devpriv->ai_bytes_to_read) {
173		outw_p(SCANL, dev->iobase + 2);	/* clears the fifo */
174		outb(0x07, dev->iobase + 8);	/* clears all flip-flops */
175#ifdef DEBUG
176		printk("das6402: Got %i samples\n\n",
177			devpriv->das6402_wordsread - diff);
178#endif
179		s->async->events |= COMEDI_CB_EOA;
180		comedi_event(dev, s);
181	}
182
183	outb(0x01, dev->iobase + 8);	/* clear only the interrupt flip-flop */
184
185	comedi_event(dev, s);
186	return IRQ_HANDLED;
187}
188
189#if 0
190static void das6402_ai_fifo_read(struct comedi_device *dev, short *data, int n)
191{
192	int i;
193
194	for (i = 0; i < n; i++)
195		data[i] = inw(dev->iobase);
196}
197#endif
198
199static void das6402_ai_fifo_dregs(struct comedi_device *dev, struct comedi_subdevice *s)
200{
201	while (1) {
202		if (!(inb(dev->iobase + 8) & 0x01))
203			return;
204		comedi_buf_put(s->async, inw(dev->iobase));
205	}
206}
207
208static int das6402_ai_cancel(struct comedi_device *dev, struct comedi_subdevice *s)
209{
210	/*
211	 *  This function should reset the board from whatever condition it
212	 *  is in (i.e., acquiring data), to a non-active state.
213	 */
214
215	devpriv->das6402_ignoreirq = 1;
216#ifdef DEBUG
217	printk("das6402: Stopping acquisition\n");
218#endif
219	devpriv->das6402_ignoreirq = 1;
220	outb_p(0x02, dev->iobase + 10);	/* disable external trigging */
221	outw_p(SCANL, dev->iobase + 2);	/* resets the card fifo */
222	outb_p(0, dev->iobase + 9);	/* disables interrupts */
223
224	outw_p(SCANL, dev->iobase + 2);
225
226	return 0;
227}
228
229#ifdef unused
230static int das6402_ai_mode2(struct comedi_device *dev, struct comedi_subdevice *s,
231	comedi_trig *it)
232{
233	devpriv->das6402_ignoreirq = 1;
234
235#ifdef DEBUG
236	printk("das6402: Starting acquisition\n");
237#endif
238	outb_p(0x03, dev->iobase + 10);	/* enable external trigging */
239	outw_p(SCANL, dev->iobase + 2);	/* resets the card fifo */
240	outb_p(IRQ | CONVSRC | BURSTEN | INTE, dev->iobase + 9);
241
242	devpriv->ai_bytes_to_read = it->n * sizeof(short);
243
244	/* um... ignoreirq is a nasty race condition */
245	devpriv->das6402_ignoreirq = 0;
246
247	outw_p(SCANL, dev->iobase + 2);
248
249	return 0;
250}
251#endif
252
253static int board_init(struct comedi_device *dev)
254{
255	BYTE b;
256
257	devpriv->das6402_ignoreirq = 1;
258
259	outb(0x07, dev->iobase + 8);
260
261	/* register 11  */
262	outb_p(MODE, dev->iobase + 11);
263	b = BIP | SEM | MODE | GAIN | FIFOHFULL;
264	outb_p(b, dev->iobase + 11);
265
266	/* register 8   */
267	outb_p(EXTEND, dev->iobase + 8);
268	b = EXTEND | MHZ;
269	outb_p(b, dev->iobase + 8);
270	b = MHZ | CLRINT | CLRXTR | CLRXIN;
271	outb_p(b, dev->iobase + 8);
272
273	/* register 9    */
274	b = IRQ | CONVSRC | BURSTEN | INTE;
275	outb_p(b, dev->iobase + 9);
276
277	/* register 10   */
278	b = TGSEL | TGEN;
279	outb_p(b, dev->iobase + 10);
280
281	b = 0x07;
282	outb_p(b, dev->iobase + 8);
283
284	das6402_setcounter(dev);
285
286	outw_p(SCANL, dev->iobase + 2);	/* reset card fifo */
287
288	devpriv->das6402_ignoreirq = 0;
289
290	return 0;
291}
292
293static int das6402_detach(struct comedi_device *dev)
294{
295	if (dev->irq)
296		free_irq(dev->irq, dev);
297	if (dev->iobase)
298		release_region(dev->iobase, DAS6402_SIZE);
299
300	return 0;
301}
302
303static int das6402_attach(struct comedi_device *dev, struct comedi_devconfig *it)
304{
305	unsigned int irq;
306	unsigned long iobase;
307	int ret;
308	struct comedi_subdevice *s;
309
310	dev->board_name = "das6402";
311
312	iobase = it->options[0];
313	if (iobase == 0)
314		iobase = 0x300;
315
316	printk("comedi%d: das6402: 0x%04lx", dev->minor, iobase);
317
318	if (!request_region(iobase, DAS6402_SIZE, "das6402")) {
319		printk(" I/O port conflict\n");
320		return -EIO;
321	}
322	dev->iobase = iobase;
323
324	/* should do a probe here */
325
326	irq = it->options[0];
327	printk(" ( irq = %u )", irq);
328	ret = request_irq(irq, intr_handler, 0, "das6402", dev);
329	if (ret < 0) {
330		printk("irq conflict\n");
331		return ret;
332	}
333	dev->irq = irq;
334
335	ret = alloc_private(dev, sizeof(struct das6402_private));
336	if (ret < 0)
337		return ret;
338
339	ret = alloc_subdevices(dev, 1);
340	if (ret < 0)
341		return ret;
342
343	/* ai subdevice */
344	s = dev->subdevices + 0;
345	s->type = COMEDI_SUBD_AI;
346	s->subdev_flags = SDF_READABLE | SDF_GROUND;
347	s->n_chan = 8;
348	/* s->trig[2]=das6402_ai_mode2; */
349	s->cancel = das6402_ai_cancel;
350	s->maxdata = (1 << 12) - 1;
351	s->len_chanlist = 16;	/* ? */
352	s->range_table = &range_unknown;
353
354	board_init(dev);
355
356	return 0;
357}
358