drivers/media/pci/cx23885/cx23885-alsa.c

   1 /*
   2  *
   3  *  Support for CX23885 analog audio capture
   4  *
   5  *    (c) 2008 Mijhail Moreyra <mijhail.moreyra@gmail.com>
   6  *    Adapted from cx88-alsa.c
   7  *    (c) 2009 Steven Toth <stoth@kernellabs.com>
   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
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/device.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/vmalloc.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/pci.h>
  31
  32 #include <asm/delay.h>
  33
  34 #include <sound/core.h>
  35 #include <sound/pcm.h>
  36 #include <sound/pcm_params.h>
  37 #include <sound/control.h>
  38 #include <sound/initval.h>
  39
  40 #include <sound/tlv.h>
  41
  42
  43 #include "cx23885.h"
  44 #include "cx23885-reg.h"
  45
  46 #define AUDIO_SRAM_CHANNEL      SRAM_CH07
  47
  48 #define dprintk(level, fmt, arg...) do {                                \
  49         if (audio_debug + 1 > level)                                    \
  50                 printk(KERN_INFO "%s: " fmt, chip->dev->name , ## arg); \
  51 } while(0)
  52
  53 #define dprintk_core(level, fmt, arg...)        if (audio_debug >= level) \
  54         printk(KERN_DEBUG "%s: " fmt, chip->dev->name , ## arg)
  55
  56 /****************************************************************************
  57                         Module global static vars
  58  ****************************************************************************/
  59
  60 static unsigned int disable_analog_audio;
  61 module_param(disable_analog_audio, int, 0644);
  62 MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver");
  63
  64 static unsigned int audio_debug;
  65 module_param(audio_debug, int, 0644);
  66 MODULE_PARM_DESC(audio_debug, "enable debug messages [analog audio]");
  67
  68 /****************************************************************************
  69                         Board specific funtions
  70  ****************************************************************************/
  71
  72 /* Constants taken from cx88-reg.h */
  73 #define AUD_INT_DN_RISCI1       (1 <<  0)
  74 #define AUD_INT_UP_RISCI1       (1 <<  1)
  75 #define AUD_INT_RDS_DN_RISCI1   (1 <<  2)
  76 #define AUD_INT_DN_RISCI2       (1 <<  4) /* yes, 3 is skipped */
  77 #define AUD_INT_UP_RISCI2       (1 <<  5)
  78 #define AUD_INT_RDS_DN_RISCI2   (1 <<  6)
  79 #define AUD_INT_DN_SYNC         (1 << 12)
  80 #define AUD_INT_UP_SYNC         (1 << 13)
  81 #define AUD_INT_RDS_DN_SYNC     (1 << 14)
  82 #define AUD_INT_OPC_ERR         (1 << 16)
  83 #define AUD_INT_BER_IRQ         (1 << 20)
  84 #define AUD_INT_MCHG_IRQ        (1 << 21)
  85 #define GP_COUNT_CONTROL_RESET  0x3
  86
  87 /*
  88  * BOARD Specific: Sets audio DMA
  89  */
  90
  91 static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip)
  92 {
  93         struct cx23885_audio_buffer *buf = chip->buf;
  94         struct cx23885_dev *dev  = chip->dev;
  95         struct sram_channel *audio_ch =
  96                 &dev->sram_channels[AUDIO_SRAM_CHANNEL];
  97
  98         dprintk(1, "%s()\n", __func__);
  99
 100         /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
 101         cx_clear(AUD_INT_DMA_CTL, 0x11);
 102
 103         /* setup fifo + format - out channel */
 104         cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl,
 105                 buf->risc.dma);
 106
 107         /* sets bpl size */
 108         cx_write(AUD_INT_A_LNGTH, buf->bpl);
 109
 110         /* This is required to get good audio (1 seems to be ok) */
 111         cx_write(AUD_INT_A_MODE, 1);
 112
 113         /* reset counter */
 114         cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 115         atomic_set(&chip->count, 0);
 116
 117         dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d "
 118                 "byte buffer\n", buf->bpl, cx_read(audio_ch->cmds_start+12)>>1,
 119                 chip->num_periods, buf->bpl * chip->num_periods);
 120
 121         /* Enables corresponding bits at AUD_INT_STAT */
 122         cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 123                                     AUD_INT_DN_RISCI1);
 124
 125         /* Clean any pending interrupt bits already set */
 126         cx_write(AUDIO_INT_INT_STAT, ~0);
 127
 128         /* enable audio irqs */
 129         cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
 130
 131         /* start dma */
 132         cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */
 133         cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and
 134                                           RISC enable */
 135         if (audio_debug)
 136                 cx23885_sram_channel_dump(chip->dev, audio_ch);
 137
 138         return 0;
 139 }
 140
 141 /*
 142  * BOARD Specific: Resets audio DMA
 143  */
 144 static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip)
 145 {
 146         struct cx23885_dev *dev = chip->dev;
 147         dprintk(1, "Stopping audio DMA\n");
 148
 149         /* stop dma */
 150         cx_clear(AUD_INT_DMA_CTL, 0x11);
 151
 152         /* disable irqs */
 153         cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
 154         cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 155                                     AUD_INT_DN_RISCI1);
 156
 157         if (audio_debug)
 158                 cx23885_sram_channel_dump(chip->dev,
 159                         &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 160
 161         return 0;
 162 }
 163
 164 /*
 165  * BOARD Specific: Handles audio IRQ
 166  */
 167 int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask)
 168 {
 169         struct cx23885_audio_dev *chip = dev->audio_dev;
 170
 171         if (0 == (status & mask))
 172                 return 0;
 173
 174         cx_write(AUDIO_INT_INT_STAT, status);
 175
 176         /* risc op code error */
 177         if (status & AUD_INT_OPC_ERR) {
 178                 printk(KERN_WARNING "%s/1: Audio risc op code error\n",
 179                         dev->name);
 180                 cx_clear(AUD_INT_DMA_CTL, 0x11);
 181                 cx23885_sram_channel_dump(dev,
 182                         &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 183         }
 184         if (status & AUD_INT_DN_SYNC) {
 185                 dprintk(1, "Downstream sync error\n");
 186                 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 187                 return 1;
 188         }
 189         /* risc1 downstream */
 190         if (status & AUD_INT_DN_RISCI1) {
 191                 atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT));
 192                 snd_pcm_period_elapsed(chip->substream);
 193         }
 194         /* FIXME: Any other status should deserve a special handling? */
 195
 196         return 1;
 197 }
 198
 199 static int dsp_buffer_free(struct cx23885_audio_dev *chip)
 200 {
 201         BUG_ON(!chip->dma_size);
 202
 203         dprintk(2, "Freeing buffer\n");
 204         videobuf_dma_unmap(&chip->pci->dev, chip->dma_risc);
 205         videobuf_dma_free(chip->dma_risc);
 206         btcx_riscmem_free(chip->pci, &chip->buf->risc);
 207         kfree(chip->buf);
 208
 209         chip->dma_risc = NULL;
 210         chip->dma_size = 0;
 211
 212         return 0;
 213 }
 214
 215 /****************************************************************************
 216                                 ALSA PCM Interface
 217  ****************************************************************************/
 218
 219 /*
 220  * Digital hardware definition
 221  */
 222 #define DEFAULT_FIFO_SIZE       4096
 223
 224 static struct snd_pcm_hardware snd_cx23885_digital_hw = {
 225         .info = SNDRV_PCM_INFO_MMAP |
 226                 SNDRV_PCM_INFO_INTERLEAVED |
 227                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 228                 SNDRV_PCM_INFO_MMAP_VALID,
 229         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 230
 231         .rates =                SNDRV_PCM_RATE_48000,
 232         .rate_min =             48000,
 233         .rate_max =             48000,
 234         .channels_min = 2,
 235         .channels_max = 2,
 236         /* Analog audio output will be full of clicks and pops if there
 237            are not exactly four lines in the SRAM FIFO buffer.  */
 238         .period_bytes_min = DEFAULT_FIFO_SIZE/4,
 239         .period_bytes_max = DEFAULT_FIFO_SIZE/4,
 240         .periods_min = 1,
 241         .periods_max = 1024,
 242         .buffer_bytes_max = (1024*1024),
 243 };
 244
 245 /*
 246  * audio pcm capture open callback
 247  */
 248 static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream)
 249 {
 250         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 251         struct snd_pcm_runtime *runtime = substream->runtime;
 252         int err;
 253
 254         if (!chip) {
 255                 printk(KERN_ERR "BUG: cx23885 can't find device struct."
 256                                 " Can't proceed with open\n");
 257                 return -ENODEV;
 258         }
 259
 260         err = snd_pcm_hw_constraint_pow2(runtime, 0,
 261                 SNDRV_PCM_HW_PARAM_PERIODS);
 262         if (err < 0)
 263                 goto _error;
 264
 265         chip->substream = substream;
 266
 267         runtime->hw = snd_cx23885_digital_hw;
 268
 269         if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
 270                 DEFAULT_FIFO_SIZE) {
 271                 unsigned int bpl = chip->dev->
 272                         sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4;
 273                 bpl &= ~7; /* must be multiple of 8 */
 274                 runtime->hw.period_bytes_min = bpl;
 275                 runtime->hw.period_bytes_max = bpl;
 276         }
 277
 278         return 0;
 279 _error:
 280         dprintk(1, "Error opening PCM!\n");
 281         return err;
 282 }
 283
 284 /*
 285  * audio close callback
 286  */
 287 static int snd_cx23885_close(struct snd_pcm_substream *substream)
 288 {
 289         return 0;
 290 }
 291
 292 /*
 293  * hw_params callback
 294  */
 295 static int snd_cx23885_hw_params(struct snd_pcm_substream *substream,
 296                               struct snd_pcm_hw_params *hw_params)
 297 {
 298         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 299         struct videobuf_dmabuf *dma;
 300
 301         struct cx23885_audio_buffer *buf;
 302         int ret;
 303
 304         if (substream->runtime->dma_area) {
 305                 dsp_buffer_free(chip);
 306                 substream->runtime->dma_area = NULL;
 307         }
 308
 309         chip->period_size = params_period_bytes(hw_params);
 310         chip->num_periods = params_periods(hw_params);
 311         chip->dma_size = chip->period_size * params_periods(hw_params);
 312
 313         BUG_ON(!chip->dma_size);
 314         BUG_ON(chip->num_periods & (chip->num_periods-1));
 315
 316         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 317         if (NULL == buf)
 318                 return -ENOMEM;
 319
 320         buf->bpl = chip->period_size;
 321
 322         dma = &buf->dma;
 323         videobuf_dma_init(dma);
 324         ret = videobuf_dma_init_kernel(dma, PCI_DMA_FROMDEVICE,
 325                         (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
 326         if (ret < 0)
 327                 goto error;
 328
 329         ret = videobuf_dma_map(&chip->pci->dev, dma);
 330         if (ret < 0)
 331                 goto error;
 332
 333         ret = cx23885_risc_databuffer(chip->pci, &buf->risc, dma->sglist,
 334                                    chip->period_size, chip->num_periods, 1);
 335         if (ret < 0)
 336                 goto error;
 337
 338         /* Loop back to start of program */
 339         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC);
 340         buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 341         buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
 342
 343         chip->buf = buf;
 344         chip->dma_risc = dma;
 345
 346         substream->runtime->dma_area = chip->dma_risc->vaddr;
 347         substream->runtime->dma_bytes = chip->dma_size;
 348         substream->runtime->dma_addr = 0;
 349
 350         return 0;
 351
 352 error:
 353         kfree(buf);
 354         return ret;
 355 }
 356
 357 /*
 358  * hw free callback
 359  */
 360 static int snd_cx23885_hw_free(struct snd_pcm_substream *substream)
 361 {
 362
 363         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 364
 365         if (substream->runtime->dma_area) {
 366                 dsp_buffer_free(chip);
 367                 substream->runtime->dma_area = NULL;
 368         }
 369
 370         return 0;
 371 }
 372
 373 /*
 374  * prepare callback
 375  */
 376 static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
 377 {
 378         return 0;
 379 }
 380
 381 /*
 382  * trigger callback
 383  */
 384 static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream,
 385         int cmd)
 386 {
 387         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 388         int err;
 389
 390         /* Local interrupts are already disabled by ALSA */
 391         spin_lock(&chip->lock);
 392
 393         switch (cmd) {
 394         case SNDRV_PCM_TRIGGER_START:
 395                 err = cx23885_start_audio_dma(chip);
 396                 break;
 397         case SNDRV_PCM_TRIGGER_STOP:
 398                 err = cx23885_stop_audio_dma(chip);
 399                 break;
 400         default:
 401                 err = -EINVAL;
 402                 break;
 403         }
 404
 405         spin_unlock(&chip->lock);
 406
 407         return err;
 408 }
 409
 410 /*
 411  * pointer callback
 412  */
 413 static snd_pcm_uframes_t snd_cx23885_pointer(
 414         struct snd_pcm_substream *substream)
 415 {
 416         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 417         struct snd_pcm_runtime *runtime = substream->runtime;
 418         u16 count;
 419
 420         count = atomic_read(&chip->count);
 421
 422         return runtime->period_size * (count & (runtime->periods-1));
 423 }
 424
 425 /*
 426  * page callback (needed for mmap)
 427  */
 428 static struct page *snd_cx23885_page(struct snd_pcm_substream *substream,
 429                                 unsigned long offset)
 430 {
 431         void *pageptr = substream->runtime->dma_area + offset;
 432         return vmalloc_to_page(pageptr);
 433 }
 434
 435 /*
 436  * operators
 437  */
 438 static struct snd_pcm_ops snd_cx23885_pcm_ops = {
 439         .open = snd_cx23885_pcm_open,
 440         .close = snd_cx23885_close,
 441         .ioctl = snd_pcm_lib_ioctl,
 442         .hw_params = snd_cx23885_hw_params,
 443         .hw_free = snd_cx23885_hw_free,
 444         .prepare = snd_cx23885_prepare,
 445         .trigger = snd_cx23885_card_trigger,
 446         .pointer = snd_cx23885_pointer,
 447         .page = snd_cx23885_page,
 448 };
 449
 450 /*
 451  * create a PCM device
 452  */
 453 static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device,
 454         char *name)
 455 {
 456         int err;
 457         struct snd_pcm *pcm;
 458
 459         err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
 460         if (err < 0)
 461                 return err;
 462         pcm->private_data = chip;
 463         strcpy(pcm->name, name);
 464         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops);
 465
 466         return 0;
 467 }
 468
 469 /****************************************************************************
 470                         Basic Flow for Sound Devices
 471  ****************************************************************************/
 472
 473 /*
 474  * Alsa Constructor - Component probe
 475  */
 476
 477 struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev)
 478 {
 479         struct snd_card *card;
 480         struct cx23885_audio_dev *chip;
 481         int err;
 482
 483         if (disable_analog_audio)
 484                 return NULL;
 485
 486         if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) {
 487                 printk(KERN_WARNING "%s(): Missing SRAM channel configuration "
 488                         "for analog TV Audio\n", __func__);
 489                 return NULL;
 490         }
 491
 492         err = snd_card_create(SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 493                         THIS_MODULE, sizeof(struct cx23885_audio_dev), &card);
 494         if (err < 0)
 495                 goto error;
 496
 497         chip = (struct cx23885_audio_dev *) card->private_data;
 498         chip->dev = dev;
 499         chip->pci = dev->pci;
 500         chip->card = card;
 501         spin_lock_init(&chip->lock);
 502
 503         snd_card_set_dev(card, &dev->pci->dev);
 504
 505         err = snd_cx23885_pcm(chip, 0, "CX23885 Digital");
 506         if (err < 0)
 507                 goto error;
 508
 509         strcpy(card->driver, "CX23885");
 510         sprintf(card->shortname, "Conexant CX23885");
 511         sprintf(card->longname, "%s at %s", card->shortname, dev->name);
 512
 513         err = snd_card_register(card);
 514         if (err < 0)
 515                 goto error;
 516
 517         dprintk(0, "registered ALSA audio device\n");
 518
 519         return chip;
 520
 521 error:
 522         snd_card_free(card);
 523         printk(KERN_ERR "%s(): Failed to register analog "
 524                         "audio adapter\n", __func__);
 525
 526         return NULL;
 527 }
 528
 529 /*
 530  * ALSA destructor
 531  */
 532 void cx23885_audio_unregister(struct cx23885_dev *dev)
 533 {
 534         struct cx23885_audio_dev *chip = dev->audio_dev;
 535
 536         snd_card_free(chip->card);
 537 }