1 /*********************************************************************
2 *
3 * msnd.c - Driver Base
4 *
5 * Turtle Beach MultiSound Sound Card Driver for Linux
6 *
7 * Copyright (C) 1998 Andrew Veliath
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 *
23 * $Id: msnd.c,v 1.17 1999/03/21 16:50:09 andrewtv Exp $
24 *
25 ********************************************************************/
26
27 #include <linux/module.h>
28 #include <linux/kernel.h>
29 #include <linux/slab.h>
30 #include <linux/vmalloc.h>
31 #include <linux/types.h>
32 #include <linux/delay.h>
33 #include <linux/mm.h>
34 #include <linux/init.h>
35 #include <linux/interrupt.h>
36
37 #include <asm/io.h>
38 #include <asm/uaccess.h>
39 #include <linux/spinlock.h>
40 #include <asm/irq.h>
41 #include "msnd.h"
42
43 #define LOGNAME "msnd"
44
45 #define MSND_MAX_DEVS 4
46
47 static multisound_dev_t *devs[MSND_MAX_DEVS];
48 static int num_devs;
49
50 int msnd_register(multisound_dev_t *dev)
51 {
52 int i;
53
54 for (i = 0; i < MSND_MAX_DEVS; ++i)
55 if (devs[i] == NULL)
56 break;
57
58 if (i == MSND_MAX_DEVS)
59 return -ENOMEM;
60
61 devs[i] = dev;
62 ++num_devs;
63 return 0;
64 }
65
66 void msnd_unregister(multisound_dev_t *dev)
67 {
68 int i;
69
70 for (i = 0; i < MSND_MAX_DEVS; ++i)
71 if (devs[i] == dev)
72 break;
73
74 if (i == MSND_MAX_DEVS) {
75 printk(KERN_WARNING LOGNAME ": Unregistering unknown device\n");
76 return;
77 }
78
79 devs[i] = NULL;
80 --num_devs;
81 }
82
83 void msnd_init_queue(void __iomem *base, int start, int size)
84 {
85 writew(PCTODSP_BASED(start), base + JQS_wStart);
86 writew(PCTODSP_OFFSET(size) - 1, base + JQS_wSize);
87 writew(0, base + JQS_wHead);
88 writew(0, base + JQS_wTail);
89 }
90
91 void msnd_fifo_init(msnd_fifo *f)
92 {
93 f->data = NULL;
94 }
95
96 void msnd_fifo_free(msnd_fifo *f)
97 {
98 vfree(f->data);
99 f->data = NULL;
100 }
101
102 int msnd_fifo_alloc(msnd_fifo *f, size_t n)
103 {
104 msnd_fifo_free(f);
105 f->data = (char *)vmalloc(n);
106 f->n = n;
107 f->tail = 0;
108 f->head = 0;
109 f->len = 0;
110
111 if (!f->data)
112 return -ENOMEM;
113
114 return 0;
115 }
116
117 void msnd_fifo_make_empty(msnd_fifo *f)
118 {
119 f->len = f->tail = f->head = 0;
120 }
121
122 int msnd_fifo_write_io(msnd_fifo *f, char __iomem *buf, size_t len)
123 {
124 int count = 0;
125
126 while ((count < len) && (f->len != f->n)) {
127
128 int nwritten;
129
130 if (f->head <= f->tail) {
131 nwritten = len - count;
132 if (nwritten > f->n - f->tail)
133 nwritten = f->n - f->tail;
134 }
135 else {
136 nwritten = f->head - f->tail;
137 if (nwritten > len - count)
138 nwritten = len - count;
139 }
140
141 memcpy_fromio(f->data + f->tail, buf, nwritten);
142
143 count += nwritten;
144 buf += nwritten;
145 f->len += nwritten;
146 f->tail += nwritten;
147 f->tail %= f->n;
148 }
149
150 return count;
151 }
152
153 int msnd_fifo_write(msnd_fifo *f, const char *buf, size_t len)
154 {
155 int count = 0;
156
157 while ((count < len) && (f->len != f->n)) {
158
159 int nwritten;
160
161 if (f->head <= f->tail) {
162 nwritten = len - count;
163 if (nwritten > f->n - f->tail)
164 nwritten = f->n - f->tail;
165 }
166 else {
167 nwritten = f->head - f->tail;
168 if (nwritten > len - count)
169 nwritten = len - count;
170 }
171
172 memcpy(f->data + f->tail, buf, nwritten);
173
174 count += nwritten;
175 buf += nwritten;
176 f->len += nwritten;
177 f->tail += nwritten;
178 f->tail %= f->n;
179 }
180
181 return count;
182 }
183
184 int msnd_fifo_read_io(msnd_fifo *f, char __iomem *buf, size_t len)
185 {
186 int count = 0;
187
188 while ((count < len) && (f->len > 0)) {
189
190 int nread;
191
192 if (f->tail <= f->head) {
193 nread = len - count;
194 if (nread > f->n - f->head)
195 nread = f->n - f->head;
196 }
197 else {
198 nread = f->tail - f->head;
199 if (nread > len - count)
200 nread = len - count;
201 }
202
203 memcpy_toio(buf, f->data + f->head, nread);
204
205 count += nread;
206 buf += nread;
207 f->len -= nread;
208 f->head += nread;
209 f->head %= f->n;
210 }
211
212 return count;
213 }
214
215 int msnd_fifo_read(msnd_fifo *f, char *buf, size_t len)
216 {
217 int count = 0;
218
219 while ((count < len) && (f->len > 0)) {
220
221 int nread;
222
223 if (f->tail <= f->head) {
224 nread = len - count;
225 if (nread > f->n - f->head)
226 nread = f->n - f->head;
227 }
228 else {
229 nread = f->tail - f->head;
230 if (nread > len - count)
231 nread = len - count;
232 }
233
234 memcpy(buf, f->data + f->head, nread);
235
236 count += nread;
237 buf += nread;
238 f->len -= nread;
239 f->head += nread;
240 f->head %= f->n;
241 }
242
243 return count;
244 }
245
246 static int msnd_wait_TXDE(multisound_dev_t *dev)
247 {
248 register unsigned int io = dev->io;
249 register int timeout = 1000;
250
251 while(timeout-- > 0)
252 if (msnd_inb(io + HP_ISR) & HPISR_TXDE)
253 return 0;
254
255 return -EIO;
256 }
257
258 static int msnd_wait_HC0(multisound_dev_t *dev)
259 {
260 register unsigned int io = dev->io;
261 register int timeout = 1000;
262
263 while(timeout-- > 0)
264 if (!(msnd_inb(io + HP_CVR) & HPCVR_HC))
265 return 0;
266
267 return -EIO;
268 }
269
270 int msnd_send_dsp_cmd(multisound_dev_t *dev, BYTE cmd)
271 {
272 unsigned long flags;
273
274 spin_lock_irqsave(&dev->lock, flags);
275 if (msnd_wait_HC0(dev) == 0) {
276 msnd_outb(cmd, dev->io + HP_CVR);
277 spin_unlock_irqrestore(&dev->lock, flags);
278 return 0;
279 }
280 spin_unlock_irqrestore(&dev->lock, flags);
281
282 printk(KERN_DEBUG LOGNAME ": Send DSP command timeout\n");
283
284 return -EIO;
285 }
286
287 int msnd_send_word(multisound_dev_t *dev, unsigned char high,
288 unsigned char mid, unsigned char low)
289 {
290 register unsigned int io = dev->io;
291
292 if (msnd_wait_TXDE(dev) == 0) {
293 msnd_outb(high, io + HP_TXH);
294 msnd_outb(mid, io + HP_TXM);
295 msnd_outb(low, io + HP_TXL);
296 return 0;
297 }
298
299 printk(KERN_DEBUG LOGNAME ": Send host word timeout\n");
300
301 return -EIO;
302 }
303
304 int msnd_upload_host(multisound_dev_t *dev, char *bin, int len)
305 {
306 int i;
307
308 if (len % 3 != 0) {
309 printk(KERN_WARNING LOGNAME ": Upload host data not multiple of 3!\n");
310 return -EINVAL;
311 }
312
313 for (i = 0; i < len; i += 3)
314 if (msnd_send_word(dev, bin[i], bin[i + 1], bin[i + 2]) != 0)
315 return -EIO;
316
317 msnd_inb(dev->io + HP_RXL);
318 msnd_inb(dev->io + HP_CVR);
319
320 return 0;
321 }
322
323 int msnd_enable_irq(multisound_dev_t *dev)
324 {
325 unsigned long flags;
326
327 if (dev->irq_ref++)
328 return 0;
329
330 printk(KERN_DEBUG LOGNAME ": Enabling IRQ\n");
331
332 spin_lock_irqsave(&dev->lock, flags);
333 if (msnd_wait_TXDE(dev) == 0) {
334 msnd_outb(msnd_inb(dev->io + HP_ICR) | HPICR_TREQ, dev->io + HP_ICR);
335 if (dev->type == msndClassic)
336 msnd_outb(dev->irqid, dev->io + HP_IRQM);
337 msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_TREQ, dev->io + HP_ICR);
338 msnd_outb(msnd_inb(dev->io + HP_ICR) | HPICR_RREQ, dev->io + HP_ICR);
339 enable_irq(dev->irq);
340 msnd_init_queue(dev->DSPQ, dev->dspq_data_buff, dev->dspq_buff_size);
341 spin_unlock_irqrestore(&dev->lock, flags);
342 return 0;
343 }
344 spin_unlock_irqrestore(&dev->lock, flags);
345
346 printk(KERN_DEBUG LOGNAME ": Enable IRQ failed\n");
347
348 return -EIO;
349 }
350
351 int msnd_disable_irq(multisound_dev_t *dev)
352 {
353 unsigned long flags;
354
355 if (--dev->irq_ref > 0)
356 return 0;
357
358 if (dev->irq_ref < 0)
359 printk(KERN_DEBUG LOGNAME ": IRQ ref count is %d\n", dev->irq_ref);
360
361 printk(KERN_DEBUG LOGNAME ": Disabling IRQ\n");
362
363 spin_lock_irqsave(&dev->lock, flags);
364 if (msnd_wait_TXDE(dev) == 0) {
365 msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_RREQ, dev->io + HP_ICR);
366 if (dev->type == msndClassic)
367 msnd_outb(HPIRQ_NONE, dev->io + HP_IRQM);
368 disable_irq(dev->irq);
369 spin_unlock_irqrestore(&dev->lock, flags);
370 return 0;
371 }
372 spin_unlock_irqrestore(&dev->lock, flags);
373
374 printk(KERN_DEBUG LOGNAME ": Disable IRQ failed\n");
375
376 return -EIO;
377 }
378
379 #ifndef LINUX20
380 EXPORT_SYMBOL(msnd_register);
381 EXPORT_SYMBOL(msnd_unregister);
382
383 EXPORT_SYMBOL(msnd_init_queue);
384
385 EXPORT_SYMBOL(msnd_fifo_init);
386 EXPORT_SYMBOL(msnd_fifo_free);
387 EXPORT_SYMBOL(msnd_fifo_alloc);
388 EXPORT_SYMBOL(msnd_fifo_make_empty);
389 EXPORT_SYMBOL(msnd_fifo_write_io);
390 EXPORT_SYMBOL(msnd_fifo_read_io);
391 EXPORT_SYMBOL(msnd_fifo_write);
392 EXPORT_SYMBOL(msnd_fifo_read);
393
394 EXPORT_SYMBOL(msnd_send_dsp_cmd);
395 EXPORT_SYMBOL(msnd_send_word);
396 EXPORT_SYMBOL(msnd_upload_host);
397
398 EXPORT_SYMBOL(msnd_enable_irq);
399 EXPORT_SYMBOL(msnd_disable_irq);
400 #endif
401
402 #ifdef MODULE
403 MODULE_AUTHOR ("Andrew Veliath <andrewtv@usa.net>");
404 MODULE_DESCRIPTION ("Turtle Beach MultiSound Driver Base");
405 MODULE_LICENSE("GPL");
406
407
408 int init_module(void)
409 {
410 return 0;
411 }
412
413 void cleanup_module(void)
414 {
415 }
416 #endif
417
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