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   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