sound/oss/vidc.c

   1 /*
   2  *  linux/drivers/sound/vidc.c
   3  *
   4  *  Copyright (C) 1997-2000 by Russell King <rmk@arm.linux.org.uk>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  VIDC20 audio driver.
  11  *
  12  * The VIDC20 sound hardware consists of the VIDC20 itself, a DAC and a DMA
  13  * engine.  The DMA transfers fixed-format (16-bit little-endian linear)
  14  * samples to the VIDC20, which then transfers this data serially to the
  15  * DACs.  The samplerate is controlled by the VIDC.
  16  *
  17  * We currently support a mixer device, but it is currently non-functional.
  18  */
  19
  20 #include <linux/gfp.h>
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/interrupt.h>
  25
  26 #include <mach/hardware.h>
  27 #include <asm/dma.h>
  28 #include <asm/io.h>
  29 #include <asm/hardware/iomd.h>
  30 #include <asm/irq.h>
  31
  32 #include "sound_config.h"
  33 #include "vidc.h"
  34
  35 #ifndef _SIOC_TYPE
  36 #define _SIOC_TYPE(x)   _IOC_TYPE(x)
  37 #endif
  38 #ifndef _SIOC_NR
  39 #define _SIOC_NR(x)     _IOC_NR(x)
  40 #endif
  41
  42 #define VIDC_SOUND_CLOCK        (250000)
  43 #define VIDC_SOUND_CLOCK_EXT    (176400)
  44
  45 /*
  46  * When using SERIAL SOUND mode (external DAC), the number of physical
  47  * channels is fixed at 2.
  48  */
  49 static int              vidc_busy;
  50 static int              vidc_adev;
  51 static int              vidc_audio_rate;
  52 static char             vidc_audio_format;
  53 static char             vidc_audio_channels;
  54
  55 static unsigned char    vidc_level_l[SOUND_MIXER_NRDEVICES] = {
  56         85,             /* master       */
  57         50,             /* bass         */
  58         50,             /* treble       */
  59         0,              /* synth        */
  60         75,             /* pcm          */
  61         0,              /* speaker      */
  62         100,            /* ext line     */
  63         0,              /* mic          */
  64         100,            /* CD           */
  65         0,
  66 };
  67
  68 static unsigned char    vidc_level_r[SOUND_MIXER_NRDEVICES] = {
  69         85,             /* master       */
  70         50,             /* bass         */
  71         50,             /* treble       */
  72         0,              /* synth        */
  73         75,             /* pcm          */
  74         0,              /* speaker      */
  75         100,            /* ext line     */
  76         0,              /* mic          */
  77         100,            /* CD           */
  78         0,
  79 };
  80
  81 static unsigned int     vidc_audio_volume_l;    /* left PCM vol, 0 - 65536 */
  82 static unsigned int     vidc_audio_volume_r;    /* right PCM vol, 0 - 65536 */
  83
  84 extern void     vidc_update_filler(int bits, int channels);
  85 extern int      softoss_dev;
  86
  87 static void
  88 vidc_mixer_set(int mdev, unsigned int level)
  89 {
  90         unsigned int lev_l = level & 0x007f;
  91         unsigned int lev_r = (level & 0x7f00) >> 8;
  92         unsigned int mlev_l, mlev_r;
  93
  94         if (lev_l > 100)
  95                 lev_l = 100;
  96         if (lev_r > 100)
  97                 lev_r = 100;
  98
  99 #define SCALE(lev,master)       ((lev) * (master) * 65536 / 10000)
 100
 101         mlev_l = vidc_level_l[SOUND_MIXER_VOLUME];
 102         mlev_r = vidc_level_r[SOUND_MIXER_VOLUME];
 103
 104         switch (mdev) {
 105         case SOUND_MIXER_VOLUME:
 106         case SOUND_MIXER_PCM:
 107                 vidc_level_l[mdev] = lev_l;
 108                 vidc_level_r[mdev] = lev_r;
 109
 110                 vidc_audio_volume_l = SCALE(lev_l, mlev_l);
 111                 vidc_audio_volume_r = SCALE(lev_r, mlev_r);
 112 /*printk("VIDC: PCM vol %05X %05X\n", vidc_audio_volume_l, vidc_audio_volume_r);*/
 113                 break;
 114         }
 115 #undef SCALE
 116 }
 117
 118 static int vidc_mixer_ioctl(int dev, unsigned int cmd, void __user *arg)
 119 {
 120         unsigned int val;
 121         unsigned int mdev;
 122
 123         if (_SIOC_TYPE(cmd) != 'M')
 124                 return -EINVAL;
 125
 126         mdev = _SIOC_NR(cmd);
 127
 128         if (_SIOC_DIR(cmd) & _SIOC_WRITE) {
 129                 if (get_user(val, (unsigned int __user *)arg))
 130                         return -EFAULT;
 131
 132                 if (mdev < SOUND_MIXER_NRDEVICES)
 133                         vidc_mixer_set(mdev, val);
 134                 else
 135                         return -EINVAL;
 136         }
 137
 138         /*
 139          * Return parameters
 140          */
 141         switch (mdev) {
 142         case SOUND_MIXER_RECSRC:
 143                 val = 0;
 144                 break;
 145
 146         case SOUND_MIXER_DEVMASK:
 147                 val = SOUND_MASK_VOLUME | SOUND_MASK_PCM | SOUND_MASK_SYNTH;
 148                 break;
 149
 150         case SOUND_MIXER_STEREODEVS:
 151                 val = SOUND_MASK_VOLUME | SOUND_MASK_PCM | SOUND_MASK_SYNTH;
 152                 break;
 153
 154         case SOUND_MIXER_RECMASK:
 155                 val = 0;
 156                 break;
 157
 158         case SOUND_MIXER_CAPS:
 159                 val = 0;
 160                 break;
 161
 162         default:
 163                 if (mdev < SOUND_MIXER_NRDEVICES)
 164                         val = vidc_level_l[mdev] | vidc_level_r[mdev] << 8;
 165                 else
 166                         return -EINVAL;
 167         }
 168
 169         return put_user(val, (unsigned int __user *)arg) ? -EFAULT : 0;
 170 }
 171
 172 static unsigned int vidc_audio_set_format(int dev, unsigned int fmt)
 173 {
 174         switch (fmt) {
 175         default:
 176                 fmt = AFMT_S16_LE;
 177         case AFMT_U8:
 178         case AFMT_S8:
 179         case AFMT_S16_LE:
 180                 vidc_audio_format = fmt;
 181                 vidc_update_filler(vidc_audio_format, vidc_audio_channels);
 182         case AFMT_QUERY:
 183                 break;
 184         }
 185         return vidc_audio_format;
 186 }
 187
 188 #define my_abs(i) ((i)<0 ? -(i) : (i))
 189
 190 static int vidc_audio_set_speed(int dev, int rate)
 191 {
 192         if (rate) {
 193                 unsigned int hwctrl, hwrate, hwrate_ext, rate_int, rate_ext;
 194                 unsigned int diff_int, diff_ext;
 195                 unsigned int newsize, new2size;
 196
 197                 hwctrl = 0x00000003;
 198
 199                 /* Using internal clock */
 200                 hwrate = (((VIDC_SOUND_CLOCK * 2) / rate) + 1) >> 1;
 201                 if (hwrate < 3)
 202                         hwrate = 3;
 203                 if (hwrate > 255)
 204                         hwrate = 255;
 205
 206                 /* Using exernal clock */
 207                 hwrate_ext = (((VIDC_SOUND_CLOCK_EXT * 2) / rate) + 1) >> 1;
 208                 if (hwrate_ext < 3)
 209                         hwrate_ext = 3;
 210                 if (hwrate_ext > 255)
 211                         hwrate_ext = 255;
 212
 213                 rate_int = VIDC_SOUND_CLOCK / hwrate;
 214                 rate_ext = VIDC_SOUND_CLOCK_EXT / hwrate_ext;
 215
 216                 /* Chose between external and internal clock */
 217                 diff_int = my_abs(rate_ext-rate);
 218                 diff_ext = my_abs(rate_int-rate);
 219                 if (diff_ext < diff_int) {
 220                         /*printk("VIDC: external %d %d %d\n", rate, rate_ext, hwrate_ext);*/
 221                         hwrate=hwrate_ext;
 222                         hwctrl=0x00000002;
 223                         /* Allow roughly 0.4% tolerance */
 224                         if (diff_ext > (rate/256))
 225                                 rate=rate_ext;
 226                 } else {
 227                         /*printk("VIDC: internal %d %d %d\n", rate, rate_int, hwrate);*/
 228                         hwctrl=0x00000003;
 229                         /* Allow roughly 0.4% tolerance */
 230                         if (diff_int > (rate/256))
 231                                 rate=rate_int;
 232                 }
 233
 234                 vidc_writel(0xb0000000 | (hwrate - 2));
 235                 vidc_writel(0xb1000000 | hwctrl);
 236
 237                 newsize = (10000 / hwrate) & ~3;
 238                 if (newsize < 208)
 239                         newsize = 208;
 240                 if (newsize > 4096)
 241                         newsize = 4096;
 242                 for (new2size = 128; new2size < newsize; new2size <<= 1);
 243                 if (new2size - newsize > newsize - (new2size >> 1))
 244                         new2size >>= 1;
 245                 if (new2size > 4096) {
 246                         printk(KERN_ERR "VIDC: error: dma buffer (%d) %d > 4K\n",
 247                                 newsize, new2size);
 248                         new2size = 4096;
 249                 }
 250                 /*printk("VIDC: dma size %d\n", new2size);*/
 251                 dma_bufsize = new2size;
 252                 vidc_audio_rate = rate;
 253         }
 254         return vidc_audio_rate;
 255 }
 256
 257 static short vidc_audio_set_channels(int dev, short channels)
 258 {
 259         switch (channels) {
 260         default:
 261                 channels = 2;
 262         case 1:
 263         case 2:
 264                 vidc_audio_channels = channels;
 265                 vidc_update_filler(vidc_audio_format, vidc_audio_channels);
 266         case 0:
 267                 break;
 268         }
 269         return vidc_audio_channels;
 270 }
 271
 272 /*
 273  * Open the device
 274  */
 275 static int vidc_audio_open(int dev, int mode)
 276 {
 277         /* This audio device does not have recording capability */
 278         if (mode == OPEN_READ)
 279                 return -EPERM;
 280
 281         if (vidc_busy)
 282                 return -EBUSY;
 283
 284         vidc_busy = 1;
 285         return 0;
 286 }
 287
 288 /*
 289  * Close the device
 290  */
 291 static void vidc_audio_close(int dev)
 292 {
 293         vidc_busy = 0;
 294 }
 295
 296 /*
 297  * Output a block via DMA to sound device.
 298  *
 299  * We just set the DMA start and count; the DMA interrupt routine
 300  * will take care of formatting the samples (via the appropriate
 301  * vidc_filler routine), and flag via vidc_audio_dma_interrupt when
 302  * more data is required.
 303  */
 304 static void
 305 vidc_audio_output_block(int dev, unsigned long buf, int total_count, int one)
 306 {
 307         struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
 308         unsigned long flags;
 309
 310         local_irq_save(flags);
 311         dma_start = buf - (unsigned long)dmap->raw_buf_phys + (unsigned long)dmap->raw_buf;
 312         dma_count = total_count;
 313         local_irq_restore(flags);
 314 }
 315
 316 static void
 317 vidc_audio_start_input(int dev, unsigned long buf, int count, int intrflag)
 318 {
 319 }
 320
 321 static int vidc_audio_prepare_for_input(int dev, int bsize, int bcount)
 322 {
 323         return -EINVAL;
 324 }
 325
 326 static irqreturn_t vidc_audio_dma_interrupt(void)
 327 {
 328         DMAbuf_outputintr(vidc_adev, 1);
 329         return IRQ_HANDLED;
 330 }
 331
 332 /*
 333  * Prepare for outputting samples.
 334  *
 335  * Each buffer that will be passed will be `bsize' bytes long,
 336  * with a total of `bcount' buffers.
 337  */
 338 static int vidc_audio_prepare_for_output(int dev, int bsize, int bcount)
 339 {
 340         struct audio_operations *adev = audio_devs[dev];
 341
 342         dma_interrupt = NULL;
 343         adev->dmap_out->flags |= DMA_NODMA;
 344
 345         return 0;
 346 }
 347
 348 /*
 349  * Stop our current operation.
 350  */
 351 static void vidc_audio_reset(int dev)
 352 {
 353         dma_interrupt = NULL;
 354 }
 355
 356 static int vidc_audio_local_qlen(int dev)
 357 {
 358         return /*dma_count !=*/ 0;
 359 }
 360
 361 static void vidc_audio_trigger(int dev, int enable_bits)
 362 {
 363         struct audio_operations *adev = audio_devs[dev];
 364
 365         if (enable_bits & PCM_ENABLE_OUTPUT) {
 366                 if (!(adev->dmap_out->flags & DMA_ACTIVE)) {
 367                         unsigned long flags;
 368
 369                         local_irq_save(flags);
 370
 371                         /* prevent recusion */
 372                         adev->dmap_out->flags |= DMA_ACTIVE;
 373
 374                         dma_interrupt = vidc_audio_dma_interrupt;
 375                         vidc_sound_dma_irq(0, NULL);
 376                         iomd_writeb(DMA_CR_E | 0x10, IOMD_SD0CR);
 377
 378                         local_irq_restore(flags);
 379                 }
 380         }
 381 }
 382
 383 static struct audio_driver vidc_audio_driver =
 384 {
 385         .owner                  = THIS_MODULE,
 386         .open                   = vidc_audio_open,
 387         .close                  = vidc_audio_close,
 388         .output_block           = vidc_audio_output_block,
 389         .start_input            = vidc_audio_start_input,
 390         .prepare_for_input      = vidc_audio_prepare_for_input,
 391         .prepare_for_output     = vidc_audio_prepare_for_output,
 392         .halt_io                = vidc_audio_reset,
 393         .local_qlen             = vidc_audio_local_qlen,
 394         .trigger                = vidc_audio_trigger,
 395         .set_speed              = vidc_audio_set_speed,
 396         .set_bits               = vidc_audio_set_format,
 397         .set_channels           = vidc_audio_set_channels
 398 };
 399
 400 static struct mixer_operations vidc_mixer_operations = {
 401         .owner          = THIS_MODULE,
 402         .id             = "VIDC",
 403         .name           = "VIDCsound",
 404         .ioctl          = vidc_mixer_ioctl
 405 };
 406
 407 void vidc_update_filler(int format, int channels)
 408 {
 409 #define TYPE(fmt,ch) (((fmt)<<2) | ((ch)&3))
 410
 411         switch (TYPE(format, channels)) {
 412         default:
 413         case TYPE(AFMT_U8, 1):
 414                 vidc_filler = vidc_fill_1x8_u;
 415                 break;
 416
 417         case TYPE(AFMT_U8, 2):
 418                 vidc_filler = vidc_fill_2x8_u;
 419                 break;
 420
 421         case TYPE(AFMT_S8, 1):
 422                 vidc_filler = vidc_fill_1x8_s;
 423                 break;
 424
 425         case TYPE(AFMT_S8, 2):
 426                 vidc_filler = vidc_fill_2x8_s;
 427                 break;
 428
 429         case TYPE(AFMT_S16_LE, 1):
 430                 vidc_filler = vidc_fill_1x16_s;
 431                 break;
 432
 433         case TYPE(AFMT_S16_LE, 2):
 434                 vidc_filler = vidc_fill_2x16_s;
 435                 break;
 436         }
 437 }
 438
 439 static void __init attach_vidc(struct address_info *hw_config)
 440 {
 441         char name[32];
 442         int i, adev;
 443
 444         sprintf(name, "VIDC %d-bit sound", hw_config->card_subtype);
 445         conf_printf(name, hw_config);
 446         memset(dma_buf, 0, sizeof(dma_buf));
 447
 448         adev = sound_install_audiodrv(AUDIO_DRIVER_VERSION, name,
 449                         &vidc_audio_driver, sizeof(vidc_audio_driver),
 450                         DMA_AUTOMODE, AFMT_U8 | AFMT_S8 | AFMT_S16_LE,
 451                         NULL, hw_config->dma, hw_config->dma2);
 452
 453         if (adev < 0)
 454                 goto audio_failed;
 455
 456         /*
 457          * 1024 bytes => 64 buffers
 458          */
 459         audio_devs[adev]->min_fragment = 10;
 460         audio_devs[adev]->mixer_dev = num_mixers;
 461
 462         audio_devs[adev]->mixer_dev =
 463                 sound_install_mixer(MIXER_DRIVER_VERSION,
 464                                 name, &vidc_mixer_operations,
 465                                 sizeof(vidc_mixer_operations), NULL);
 466
 467         if (audio_devs[adev]->mixer_dev < 0)
 468                 goto mixer_failed;
 469
 470         for (i = 0; i < 2; i++) {
 471                 dma_buf[i] = get_zeroed_page(GFP_KERNEL);
 472                 if (!dma_buf[i]) {
 473                         printk(KERN_ERR "%s: can't allocate required buffers\n",
 474                                 name);
 475                         goto mem_failed;
 476                 }
 477                 dma_pbuf[i] = virt_to_phys((void *)dma_buf[i]);
 478         }
 479
 480         if (sound_alloc_dma(hw_config->dma, hw_config->name)) {
 481                 printk(KERN_ERR "%s: DMA %d is in  use\n", name, hw_config->dma);
 482                 goto dma_failed;
 483         }
 484
 485         if (request_irq(hw_config->irq, vidc_sound_dma_irq, 0,
 486                         hw_config->name, &dma_start)) {
 487                 printk(KERN_ERR "%s: IRQ %d is in use\n", name, hw_config->irq);
 488                 goto irq_failed;
 489         }
 490         vidc_adev = adev;
 491         vidc_mixer_set(SOUND_MIXER_VOLUME, (85 | 85 << 8));
 492
 493         return;
 494
 495 irq_failed:
 496         sound_free_dma(hw_config->dma);
 497 dma_failed:
 498 mem_failed:
 499         for (i = 0; i < 2; i++)
 500                 free_page(dma_buf[i]);
 501         sound_unload_mixerdev(audio_devs[adev]->mixer_dev);
 502 mixer_failed:
 503         sound_unload_audiodev(adev);
 504 audio_failed:
 505         return;
 506 }
 507
 508 static int __init probe_vidc(struct address_info *hw_config)
 509 {
 510         hw_config->irq          = IRQ_DMAS0;
 511         hw_config->dma          = DMA_VIRTUAL_SOUND;
 512         hw_config->dma2         = -1;
 513         hw_config->card_subtype = 16;
 514         hw_config->name         = "VIDC20";
 515         return 1;
 516 }
 517
 518 static void __exit unload_vidc(struct address_info *hw_config)
 519 {
 520         int i, adev = vidc_adev;
 521
 522         vidc_adev = -1;
 523
 524         free_irq(hw_config->irq, &dma_start);
 525         sound_free_dma(hw_config->dma);
 526
 527         if (adev >= 0) {
 528                 sound_unload_mixerdev(audio_devs[adev]->mixer_dev);
 529                 sound_unload_audiodev(adev);
 530                 for (i = 0; i < 2; i++)
 531                         free_page(dma_buf[i]);
 532         }
 533 }
 534
 535 static struct address_info cfg;
 536
 537 static int __init init_vidc(void)
 538 {
 539         if (probe_vidc(&cfg) == 0)
 540                 return -ENODEV;
 541
 542         attach_vidc(&cfg);
 543
 544         return 0;
 545 }
 546
 547 static void __exit cleanup_vidc(void)
 548 {
 549         unload_vidc(&cfg);
 550 }
 551
 552 module_init(init_vidc);
 553 module_exit(cleanup_vidc);
 554
 555 MODULE_AUTHOR("Russell King");
 556 MODULE_DESCRIPTION("VIDC20 audio driver");
 557 MODULE_LICENSE("GPL");