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   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/config.h>
  21 #include <linux/init.h>
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/interrupt.h>
  25
  26 #include <asm/hardware.h>
  27 #include <asm/dma.h>
  28 #include <asm/io.h>
  29 #include <asm/hardware/iomd.h>
  30 #include <asm/irq.h>
  31 #include <asm/system.h>
  32
  33 #include "sound_config.h"
  34 #include "vidc.h"
  35
  36 #ifndef _SIOC_TYPE
  37 #define _SIOC_TYPE(x)   _IOC_TYPE(x)
  38 #endif
  39 #ifndef _SIOC_NR
  40 #define _SIOC_NR(x)     _IOC_NR(x)
  41 #endif
  42
  43 #define VIDC_SOUND_CLOCK        (250000)
  44 #define VIDC_SOUND_CLOCK_EXT    (176400)
  45
  46 /*
  47  * When using SERIAL SOUND mode (external DAC), the number of physical
  48  * channels is fixed at 2.
  49  */
  50 static int              vidc_busy;
  51 static int              vidc_adev;
  52 static int              vidc_audio_rate;
  53 static char             vidc_audio_format;
  54 static char             vidc_audio_channels;
  55
  56 static unsigned char    vidc_level_l[SOUND_MIXER_NRDEVICES] = {
  57         85,             /* master       */
  58         50,             /* bass         */
  59         50,             /* treble       */
  60         0,              /* synth        */
  61         75,             /* pcm          */
  62         0,              /* speaker      */
  63         100,            /* ext line     */
  64         0,              /* mic          */
  65         100,            /* CD           */
  66         0,
  67 };
  68
  69 static unsigned char    vidc_level_r[SOUND_MIXER_NRDEVICES] = {
  70         85,             /* master       */
  71         50,             /* bass         */
  72         50,             /* treble       */
  73         0,              /* synth        */
  74         75,             /* pcm          */
  75         0,              /* speaker      */
  76         100,            /* ext line     */
  77         0,              /* mic          */
  78         100,            /* CD           */
  79         0,
  80 };
  81
  82 static unsigned int     vidc_audio_volume_l;    /* left PCM vol, 0 - 65536 */
  83 static unsigned int     vidc_audio_volume_r;    /* right PCM vol, 0 - 65536 */
  84
  85 extern void     vidc_update_filler(int bits, int channels);
  86 extern int      softoss_dev;
  87
  88 static void
  89 vidc_mixer_set(int mdev, unsigned int level)
  90 {
  91         unsigned int lev_l = level & 0x007f;
  92         unsigned int lev_r = (level & 0x7f00) >> 8;
  93         unsigned int mlev_l, mlev_r;
  94
  95         if (lev_l > 100)
  96                 lev_l = 100;
  97         if (lev_r > 100)
  98                 lev_r = 100;
  99
 100 #define SCALE(lev,master)       ((lev) * (master) * 65536 / 10000)
 101
 102         mlev_l = vidc_level_l[SOUND_MIXER_VOLUME];
 103         mlev_r = vidc_level_r[SOUND_MIXER_VOLUME];
 104
 105         switch (mdev) {
 106         case SOUND_MIXER_VOLUME:
 107         case SOUND_MIXER_PCM:
 108                 vidc_level_l[mdev] = lev_l;
 109                 vidc_level_r[mdev] = lev_r;
 110
 111                 vidc_audio_volume_l = SCALE(lev_l, mlev_l);
 112                 vidc_audio_volume_r = SCALE(lev_r, mlev_r);
 113 /*printk("VIDC: PCM vol %05X %05X\n", vidc_audio_volume_l, vidc_audio_volume_r);*/
 114                 break;
 115         }
 116 #undef SCALE
 117 }
 118
 119 static int vidc_mixer_ioctl(int dev, unsigned int cmd, void __user *arg)
 120 {
 121         unsigned int val;
 122         unsigned int mdev;
 123
 124         if (_SIOC_TYPE(cmd) != 'M')
 125                 return -EINVAL;
 126
 127         mdev = _SIOC_NR(cmd);
 128
 129         if (_SIOC_DIR(cmd) & _SIOC_WRITE) {
 130                 if (get_user(val, (unsigned int __user *)arg))
 131                         return -EFAULT;
 132
 133                 if (mdev < SOUND_MIXER_NRDEVICES)
 134                         vidc_mixer_set(mdev, val);
 135                 else
 136                         return -EINVAL;
 137         }
 138
 139         /*
 140          * Return parameters
 141          */
 142         switch (mdev) {
 143         case SOUND_MIXER_RECSRC:
 144                 val = 0;
 145                 break;
 146
 147         case SOUND_MIXER_DEVMASK:
 148                 val = SOUND_MASK_VOLUME | SOUND_MASK_PCM | SOUND_MASK_SYNTH;
 149                 break;
 150
 151         case SOUND_MIXER_STEREODEVS:
 152                 val = SOUND_MASK_VOLUME | SOUND_MASK_PCM | SOUND_MASK_SYNTH;
 153                 break;
 154
 155         case SOUND_MIXER_RECMASK:
 156                 val = 0;
 157                 break;
 158
 159         case SOUND_MIXER_CAPS:
 160                 val = 0;
 161                 break;
 162
 163         default:
 164                 if (mdev < SOUND_MIXER_NRDEVICES)
 165                         val = vidc_level_l[mdev] | vidc_level_r[mdev] << 8;
 166                 else
 167                         return -EINVAL;
 168         }
 169
 170         return put_user(val, (unsigned int __user *)arg) ? -EFAULT : 0;
 171 }
 172
 173 static unsigned int vidc_audio_set_format(int dev, unsigned int fmt)
 174 {
 175         switch (fmt) {
 176         default:
 177                 fmt = AFMT_S16_LE;
 178         case AFMT_U8:
 179         case AFMT_S8:
 180         case AFMT_S16_LE:
 181                 vidc_audio_format = fmt;
 182                 vidc_update_filler(vidc_audio_format, vidc_audio_channels);
 183         case AFMT_QUERY:
 184                 break;
 185         }
 186         return vidc_audio_format;
 187 }
 188
 189 #define my_abs(i) ((i)<0 ? -(i) : (i))
 190
 191 static int vidc_audio_set_speed(int dev, int rate)
 192 {
 193         if (rate) {
 194                 unsigned int hwctrl, hwrate, hwrate_ext, rate_int, rate_ext;
 195                 unsigned int diff_int, diff_ext;
 196                 unsigned int newsize, new2size;
 197
 198                 hwctrl = 0x00000003;
 199
 200                 /* Using internal clock */
 201                 hwrate = (((VIDC_SOUND_CLOCK * 2) / rate) + 1) >> 1;
 202                 if (hwrate < 3)
 203                         hwrate = 3;
 204                 if (hwrate > 255)
 205                         hwrate = 255;
 206
 207                 /* Using exernal clock */
 208                 hwrate_ext = (((VIDC_SOUND_CLOCK_EXT * 2) / rate) + 1) >> 1;
 209                 if (hwrate_ext < 3)
 210                         hwrate_ext = 3;
 211                 if (hwrate_ext > 255)
 212                         hwrate_ext = 255;
 213
 214                 rate_int = VIDC_SOUND_CLOCK / hwrate;
 215                 rate_ext = VIDC_SOUND_CLOCK_EXT / hwrate_ext;
 216
 217                 /* Chose between external and internal clock */
 218                 diff_int = my_abs(rate_ext-rate);
 219                 diff_ext = my_abs(rate_int-rate);
 220                 if (diff_ext < diff_int) {
 221                         /*printk("VIDC: external %d %d %d\n", rate, rate_ext, hwrate_ext);*/
 222                         hwrate=hwrate_ext;
 223                         hwctrl=0x00000002;
 224                         /* Allow roughly 0.4% tolerance */
 225                         if (diff_ext > (rate/256))
 226                                 rate=rate_ext;
 227                 } else {
 228                         /*printk("VIDC: internal %d %d %d\n", rate, rate_int, hwrate);*/
 229                         hwctrl=0x00000003;
 230                         /* Allow rougly 0.4% tolerance */
 231                         if (diff_int > (rate/256))
 232                                 rate=rate_int;
 233                 }
 234
 235                 vidc_writel(0xb0000000 | (hwrate - 2));
 236                 vidc_writel(0xb1000000 | hwctrl);
 237
 238                 newsize = (10000 / hwrate) & ~3;
 239                 if (newsize < 208)
 240                         newsize = 208;
 241                 if (newsize > 4096)
 242                         newsize = 4096;
 243                 for (new2size = 128; new2size < newsize; new2size <<= 1);
 244                 if (new2size - newsize > newsize - (new2size >> 1))
 245                         new2size >>= 1;
 246                 if (new2size > 4096) {
 247                         printk(KERN_ERR "VIDC: error: dma buffer (%d) %d > 4K\n",
 248                                 newsize, new2size);
 249                         new2size = 4096;
 250                 }
 251                 /*printk("VIDC: dma size %d\n", new2size);*/
 252                 dma_bufsize = new2size;
 253                 vidc_audio_rate = rate;
 254         }
 255         return vidc_audio_rate;
 256 }
 257
 258 static short vidc_audio_set_channels(int dev, short channels)
 259 {
 260         switch (channels) {
 261         default:
 262                 channels = 2;
 263         case 1:
 264         case 2:
 265                 vidc_audio_channels = channels;
 266                 vidc_update_filler(vidc_audio_format, vidc_audio_channels);
 267         case 0:
 268                 break;
 269         }
 270         return vidc_audio_channels;
 271 }
 272
 273 /*
 274  * Open the device
 275  */
 276 static int vidc_audio_open(int dev, int mode)
 277 {
 278         /* This audio device does not have recording capability */
 279         if (mode == OPEN_READ)
 280                 return -EPERM;
 281
 282         if (vidc_busy)
 283                 return -EBUSY;
 284
 285         vidc_busy = 1;
 286         return 0;
 287 }
 288
 289 /*
 290  * Close the device
 291  */
 292 static void vidc_audio_close(int dev)
 293 {
 294         vidc_busy = 0;
 295 }
 296
 297 /*
 298  * Output a block via DMA to sound device.
 299  *
 300  * We just set the DMA start and count; the DMA interrupt routine
 301  * will take care of formatting the samples (via the appropriate
 302  * vidc_filler routine), and flag via vidc_audio_dma_interrupt when
 303  * more data is required.
 304  */
 305 static void
 306 vidc_audio_output_block(int dev, unsigned long buf, int total_count, int one)
 307 {
 308         struct dma_buffparms *dmap = audio_devs[dev]->dmap_out;
 309         unsigned long flags;
 310
 311         local_irq_save(flags);
 312         dma_start = buf - (unsigned long)dmap->raw_buf_phys + (unsigned long)dmap->raw_buf;
 313         dma_count = total_count;
 314         local_irq_restore(flags);
 315 }
 316
 317 static void
 318 vidc_audio_start_input(int dev, unsigned long buf, int count, int intrflag)
 319 {
 320 }
 321
 322 static int vidc_audio_prepare_for_input(int dev, int bsize, int bcount)
 323 {
 324         return -EINVAL;
 325 }
 326
 327 static irqreturn_t vidc_audio_dma_interrupt(void)
 328 {
 329         DMAbuf_outputintr(vidc_adev, 1);
 330         return IRQ_HANDLED;
 331 }
 332
 333 /*
 334  * Prepare for outputting samples.
 335  *
 336  * Each buffer that will be passed will be `bsize' bytes long,
 337  * with a total of `bcount' buffers.
 338  */
 339 static int vidc_audio_prepare_for_output(int dev, int bsize, int bcount)
 340 {
 341         struct audio_operations *adev = audio_devs[dev];
 342
 343         dma_interrupt = NULL;
 344         adev->dmap_out->flags |= DMA_NODMA;
 345
 346         return 0;
 347 }
 348
 349 /*
 350  * Stop our current operation.
 351  */
 352 static void vidc_audio_reset(int dev)
 353 {
 354         dma_interrupt = NULL;
 355 }
 356
 357 static int vidc_audio_local_qlen(int dev)
 358 {
 359         return /*dma_count !=*/ 0;
 360 }
 361
 362 static void vidc_audio_trigger(int dev, int enable_bits)
 363 {
 364         struct audio_operations *adev = audio_devs[dev];
 365
 366         if (enable_bits & PCM_ENABLE_OUTPUT) {
 367                 if (!(adev->flags & DMA_ACTIVE)) {
 368                         unsigned long flags;
 369
 370                         local_irq_save(flags);
 371
 372                         /* prevent recusion */
 373                         adev->flags |= DMA_ACTIVE;
 374
 375                         dma_interrupt = vidc_audio_dma_interrupt;
 376                         vidc_sound_dma_irq(0, NULL, NULL);
 377                         iomd_writeb(DMA_CR_E | 0x10, IOMD_SD0CR);
 378
 379                         local_irq_restore(flags);
 380                 }
 381         }
 382 }
 383
 384 static struct audio_driver vidc_audio_driver =
 385 {
 386         .owner                  = THIS_MODULE,
 387         .open                   = vidc_audio_open,
 388         .close                  = vidc_audio_close,
 389         .output_block           = vidc_audio_output_block,
 390         .start_input            = vidc_audio_start_input,
 391         .prepare_for_input      = vidc_audio_prepare_for_input,
 392         .prepare_for_output     = vidc_audio_prepare_for_output,
 393         .halt_io                = vidc_audio_reset,
 394         .local_qlen             = vidc_audio_local_qlen,
 395         .trigger                = vidc_audio_trigger,
 396         .set_speed              = vidc_audio_set_speed,
 397         .set_bits               = vidc_audio_set_format,
 398         .set_channels           = vidc_audio_set_channels
 399 };
 400
 401 static struct mixer_operations vidc_mixer_operations = {
 402         .owner          = THIS_MODULE,
 403         .id             = "VIDC",
 404         .name           = "VIDCsound",
 405         .ioctl          = vidc_mixer_ioctl
 406 };
 407
 408 void vidc_update_filler(int format, int channels)
 409 {
 410 #define TYPE(fmt,ch) (((fmt)<<2) | ((ch)&3))
 411
 412         switch (TYPE(format, channels)) {
 413         default:
 414         case TYPE(AFMT_U8, 1):
 415                 vidc_filler = vidc_fill_1x8_u;
 416                 break;
 417
 418         case TYPE(AFMT_U8, 2):
 419                 vidc_filler = vidc_fill_2x8_u;
 420                 break;
 421
 422         case TYPE(AFMT_S8, 1):
 423                 vidc_filler = vidc_fill_1x8_s;
 424                 break;
 425
 426         case TYPE(AFMT_S8, 2):
 427                 vidc_filler = vidc_fill_2x8_s;
 428                 break;
 429
 430         case TYPE(AFMT_S16_LE, 1):
 431                 vidc_filler = vidc_fill_1x16_s;
 432                 break;
 433
 434         case TYPE(AFMT_S16_LE, 2):
 435                 vidc_filler = vidc_fill_2x16_s;
 436                 break;
 437         }
 438 }
 439
 440 static void __init attach_vidc(struct address_info *hw_config)
 441 {
 442         char name[32];
 443         int i, adev;
 444
 445         sprintf(name, "VIDC %d-bit sound", hw_config->card_subtype);
 446         conf_printf(name, hw_config);
 447         memset(dma_buf, 0, sizeof(dma_buf));
 448
 449         adev = sound_install_audiodrv(AUDIO_DRIVER_VERSION, name,
 450                         &vidc_audio_driver, sizeof(vidc_audio_driver),
 451                         DMA_AUTOMODE, AFMT_U8 | AFMT_S8 | AFMT_S16_LE,
 452                         NULL, hw_config->dma, hw_config->dma2);
 453
 454         if (adev < 0)
 455                 goto audio_failed;
 456
 457         /*
 458          * 1024 bytes => 64 buffers
 459          */
 460         audio_devs[adev]->min_fragment = 10;
 461         audio_devs[adev]->mixer_dev = num_mixers;
 462
 463         audio_devs[adev]->mixer_dev =
 464                 sound_install_mixer(MIXER_DRIVER_VERSION,
 465                                 name, &vidc_mixer_operations,
 466                                 sizeof(vidc_mixer_operations), NULL);
 467
 468         if (audio_devs[adev]->mixer_dev < 0)
 469                 goto mixer_failed;
 470
 471         for (i = 0; i < 2; i++) {
 472                 dma_buf[i] = get_zeroed_page(GFP_KERNEL);
 473                 if (!dma_buf[i]) {
 474                         printk(KERN_ERR "%s: can't allocate required buffers\n",
 475                                 name);
 476                         goto mem_failed;
 477                 }
 478                 dma_pbuf[i] = virt_to_phys((void *)dma_buf[i]);
 479         }
 480
 481         if (sound_alloc_dma(hw_config->dma, hw_config->name)) {
 482                 printk(KERN_ERR "%s: DMA %d is in  use\n", name, hw_config->dma);
 483                 goto dma_failed;
 484         }
 485
 486         if (request_irq(hw_config->irq, vidc_sound_dma_irq, 0,
 487                         hw_config->name, &dma_start)) {
 488                 printk(KERN_ERR "%s: IRQ %d is in use\n", name, hw_config->irq);
 489                 goto irq_failed;
 490         }
 491         vidc_adev = adev;
 492         vidc_mixer_set(SOUND_MIXER_VOLUME, (85 | 85 << 8));
 493
 494 #if defined(CONFIG_SOUND_SOFTOSS) || defined(CONFIG_SOUND_SOFTOSS_MODULE)
 495         softoss_dev = adev;
 496 #endif
 497         return;
 498
 499 irq_failed:
 500         sound_free_dma(hw_config->dma);
 501 dma_failed:
 502 mem_failed:
 503         for (i = 0; i < 2; i++)
 504                 free_page(dma_buf[i]);
 505         sound_unload_mixerdev(audio_devs[adev]->mixer_dev);
 506 mixer_failed:
 507         sound_unload_audiodev(adev);
 508 audio_failed:
 509         return;
 510 }
 511
 512 static int __init probe_vidc(struct address_info *hw_config)
 513 {
 514         hw_config->irq          = IRQ_DMAS0;
 515         hw_config->dma          = DMA_VIRTUAL_SOUND;
 516         hw_config->dma2         = -1;
 517         hw_config->card_subtype = 16;
 518         hw_config->name         = "VIDC20";
 519         return 1;
 520 }
 521
 522 static void __exit unload_vidc(struct address_info *hw_config)
 523 {
 524         int i, adev = vidc_adev;
 525
 526         vidc_adev = -1;
 527
 528         free_irq(hw_config->irq, &dma_start);
 529         sound_free_dma(hw_config->dma);
 530
 531         if (adev >= 0) {
 532                 sound_unload_mixerdev(audio_devs[adev]->mixer_dev);
 533                 sound_unload_audiodev(adev);
 534                 for (i = 0; i < 2; i++)
 535                         free_page(dma_buf[i]);
 536         }
 537 }
 538
 539 static struct address_info cfg;
 540
 541 static int __init init_vidc(void)
 542 {
 543         if (probe_vidc(&cfg) == 0)
 544                 return -ENODEV;
 545
 546         attach_vidc(&cfg);
 547
 548         return 0;
 549 }
 550
 551 static void __exit cleanup_vidc(void)
 552 {
 553         unload_vidc(&cfg);
 554 }
 555
 556 module_init(init_vidc);
 557 module_exit(cleanup_vidc);
 558
 559 MODULE_AUTHOR("Russell King");
 560 MODULE_DESCRIPTION("VIDC20 audio driver");
 561 MODULE_LICENSE("GPL");