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
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/device.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/vmalloc.h>
  25 #include <linux/dma-mapping.h>
  26 #include <linux/pci.h>
  27
  28 #include <asm/delay.h>
  29
  30 #include <sound/core.h>
  31 #include <sound/pcm.h>
  32 #include <sound/pcm_params.h>
  33 #include <sound/control.h>
  34 #include <sound/initval.h>
  35
  36 #include <sound/tlv.h>
  37
  38
  39 #include "cx23885.h"
  40 #include "cx23885-reg.h"
  41
  42 #define AUDIO_SRAM_CHANNEL      SRAM_CH07
  43
  44 #define dprintk(level, fmt, arg...) do {                                \
  45         if (audio_debug + 1 > level)                                    \
  46                 printk(KERN_INFO "%s: " fmt, chip->dev->name , ## arg); \
  47 } while(0)
  48
  49 #define dprintk_core(level, fmt, arg...)        if (audio_debug >= level) \
  50         printk(KERN_DEBUG "%s: " fmt, chip->dev->name , ## arg)
  51
  52 /****************************************************************************
  53                         Module global static vars
  54  ****************************************************************************/
  55
  56 static unsigned int disable_analog_audio;
  57 module_param(disable_analog_audio, int, 0644);
  58 MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver");
  59
  60 static unsigned int audio_debug;
  61 module_param(audio_debug, int, 0644);
  62 MODULE_PARM_DESC(audio_debug, "enable debug messages [analog audio]");
  63
  64 /****************************************************************************
  65                         Board specific funtions
  66  ****************************************************************************/
  67
  68 /* Constants taken from cx88-reg.h */
  69 #define AUD_INT_DN_RISCI1       (1 <<  0)
  70 #define AUD_INT_UP_RISCI1       (1 <<  1)
  71 #define AUD_INT_RDS_DN_RISCI1   (1 <<  2)
  72 #define AUD_INT_DN_RISCI2       (1 <<  4) /* yes, 3 is skipped */
  73 #define AUD_INT_UP_RISCI2       (1 <<  5)
  74 #define AUD_INT_RDS_DN_RISCI2   (1 <<  6)
  75 #define AUD_INT_DN_SYNC         (1 << 12)
  76 #define AUD_INT_UP_SYNC         (1 << 13)
  77 #define AUD_INT_RDS_DN_SYNC     (1 << 14)
  78 #define AUD_INT_OPC_ERR         (1 << 16)
  79 #define AUD_INT_BER_IRQ         (1 << 20)
  80 #define AUD_INT_MCHG_IRQ        (1 << 21)
  81 #define GP_COUNT_CONTROL_RESET  0x3
  82
  83 static int cx23885_alsa_dma_init(struct cx23885_audio_dev *chip, int nr_pages)
  84 {
  85         struct cx23885_audio_buffer *buf = chip->buf;
  86         struct page *pg;
  87         int i;
  88
  89         buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
  90         if (NULL == buf->vaddr) {
  91                 dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages);
  92                 return -ENOMEM;
  93         }
  94
  95         dprintk(1, "vmalloc is at addr 0x%08lx, size=%d\n",
  96                                 (unsigned long)buf->vaddr,
  97                                 nr_pages << PAGE_SHIFT);
  98
  99         memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
 100         buf->nr_pages = nr_pages;
 101
 102         buf->sglist = vzalloc(buf->nr_pages * sizeof(*buf->sglist));
 103         if (NULL == buf->sglist)
 104                 goto vzalloc_err;
 105
 106         sg_init_table(buf->sglist, buf->nr_pages);
 107         for (i = 0; i < buf->nr_pages; i++) {
 108                 pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
 109                 if (NULL == pg)
 110                         goto vmalloc_to_page_err;
 111                 sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
 112         }
 113         return 0;
 114
 115 vmalloc_to_page_err:
 116         vfree(buf->sglist);
 117         buf->sglist = NULL;
 118 vzalloc_err:
 119         vfree(buf->vaddr);
 120         buf->vaddr = NULL;
 121         return -ENOMEM;
 122 }
 123
 124 static int cx23885_alsa_dma_map(struct cx23885_audio_dev *dev)
 125 {
 126         struct cx23885_audio_buffer *buf = dev->buf;
 127
 128         buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist,
 129                         buf->nr_pages, PCI_DMA_FROMDEVICE);
 130
 131         if (0 == buf->sglen) {
 132                 pr_warn("%s: cx23885_alsa_map_sg failed\n", __func__);
 133                 return -ENOMEM;
 134         }
 135         return 0;
 136 }
 137
 138 static int cx23885_alsa_dma_unmap(struct cx23885_audio_dev *dev)
 139 {
 140         struct cx23885_audio_buffer *buf = dev->buf;
 141
 142         if (!buf->sglen)
 143                 return 0;
 144
 145         dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE);
 146         buf->sglen = 0;
 147         return 0;
 148 }
 149
 150 static int cx23885_alsa_dma_free(struct cx23885_audio_buffer *buf)
 151 {
 152         vfree(buf->sglist);
 153         buf->sglist = NULL;
 154         vfree(buf->vaddr);
 155         buf->vaddr = NULL;
 156         return 0;
 157 }
 158
 159 /*
 160  * BOARD Specific: Sets audio DMA
 161  */
 162
 163 static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip)
 164 {
 165         struct cx23885_audio_buffer *buf = chip->buf;
 166         struct cx23885_dev *dev  = chip->dev;
 167         struct sram_channel *audio_ch =
 168                 &dev->sram_channels[AUDIO_SRAM_CHANNEL];
 169
 170         dprintk(1, "%s()\n", __func__);
 171
 172         /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
 173         cx_clear(AUD_INT_DMA_CTL, 0x11);
 174
 175         /* setup fifo + format - out channel */
 176         cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl,
 177                 buf->risc.dma);
 178
 179         /* sets bpl size */
 180         cx_write(AUD_INT_A_LNGTH, buf->bpl);
 181
 182         /* This is required to get good audio (1 seems to be ok) */
 183         cx_write(AUD_INT_A_MODE, 1);
 184
 185         /* reset counter */
 186         cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 187         atomic_set(&chip->count, 0);
 188
 189         dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d "
 190                 "byte buffer\n", buf->bpl, cx_read(audio_ch->cmds_start+12)>>1,
 191                 chip->num_periods, buf->bpl * chip->num_periods);
 192
 193         /* Enables corresponding bits at AUD_INT_STAT */
 194         cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 195                                     AUD_INT_DN_RISCI1);
 196
 197         /* Clean any pending interrupt bits already set */
 198         cx_write(AUDIO_INT_INT_STAT, ~0);
 199
 200         /* enable audio irqs */
 201         cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
 202
 203         /* start dma */
 204         cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */
 205         cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and
 206                                           RISC enable */
 207         if (audio_debug)
 208                 cx23885_sram_channel_dump(chip->dev, audio_ch);
 209
 210         return 0;
 211 }
 212
 213 /*
 214  * BOARD Specific: Resets audio DMA
 215  */
 216 static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip)
 217 {
 218         struct cx23885_dev *dev = chip->dev;
 219         dprintk(1, "Stopping audio DMA\n");
 220
 221         /* stop dma */
 222         cx_clear(AUD_INT_DMA_CTL, 0x11);
 223
 224         /* disable irqs */
 225         cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
 226         cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 227                                     AUD_INT_DN_RISCI1);
 228
 229         if (audio_debug)
 230                 cx23885_sram_channel_dump(chip->dev,
 231                         &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 232
 233         return 0;
 234 }
 235
 236 /*
 237  * BOARD Specific: Handles audio IRQ
 238  */
 239 int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask)
 240 {
 241         struct cx23885_audio_dev *chip = dev->audio_dev;
 242
 243         if (0 == (status & mask))
 244                 return 0;
 245
 246         cx_write(AUDIO_INT_INT_STAT, status);
 247
 248         /* risc op code error */
 249         if (status & AUD_INT_OPC_ERR) {
 250                 printk(KERN_WARNING "%s/1: Audio risc op code error\n",
 251                         dev->name);
 252                 cx_clear(AUD_INT_DMA_CTL, 0x11);
 253                 cx23885_sram_channel_dump(dev,
 254                         &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 255         }
 256         if (status & AUD_INT_DN_SYNC) {
 257                 dprintk(1, "Downstream sync error\n");
 258                 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 259                 return 1;
 260         }
 261         /* risc1 downstream */
 262         if (status & AUD_INT_DN_RISCI1) {
 263                 atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT));
 264                 snd_pcm_period_elapsed(chip->substream);
 265         }
 266         /* FIXME: Any other status should deserve a special handling? */
 267
 268         return 1;
 269 }
 270
 271 static int dsp_buffer_free(struct cx23885_audio_dev *chip)
 272 {
 273         struct cx23885_riscmem *risc;
 274
 275         BUG_ON(!chip->dma_size);
 276
 277         dprintk(2, "Freeing buffer\n");
 278         cx23885_alsa_dma_unmap(chip);
 279         cx23885_alsa_dma_free(chip->buf);
 280         risc = &chip->buf->risc;
 281         pci_free_consistent(chip->pci, risc->size, risc->cpu, risc->dma);
 282         kfree(chip->buf);
 283
 284         chip->buf = NULL;
 285         chip->dma_size = 0;
 286
 287         return 0;
 288 }
 289
 290 /****************************************************************************
 291                                 ALSA PCM Interface
 292  ****************************************************************************/
 293
 294 /*
 295  * Digital hardware definition
 296  */
 297 #define DEFAULT_FIFO_SIZE       4096
 298
 299 static struct snd_pcm_hardware snd_cx23885_digital_hw = {
 300         .info = SNDRV_PCM_INFO_MMAP |
 301                 SNDRV_PCM_INFO_INTERLEAVED |
 302                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 303                 SNDRV_PCM_INFO_MMAP_VALID,
 304         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 305
 306         .rates =                SNDRV_PCM_RATE_48000,
 307         .rate_min =             48000,
 308         .rate_max =             48000,
 309         .channels_min = 2,
 310         .channels_max = 2,
 311         /* Analog audio output will be full of clicks and pops if there
 312            are not exactly four lines in the SRAM FIFO buffer.  */
 313         .period_bytes_min = DEFAULT_FIFO_SIZE/4,
 314         .period_bytes_max = DEFAULT_FIFO_SIZE/4,
 315         .periods_min = 1,
 316         .periods_max = 1024,
 317         .buffer_bytes_max = (1024*1024),
 318 };
 319
 320 /*
 321  * audio pcm capture open callback
 322  */
 323 static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream)
 324 {
 325         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 326         struct snd_pcm_runtime *runtime = substream->runtime;
 327         int err;
 328
 329         if (!chip) {
 330                 printk(KERN_ERR "BUG: cx23885 can't find device struct."
 331                                 " Can't proceed with open\n");
 332                 return -ENODEV;
 333         }
 334
 335         err = snd_pcm_hw_constraint_pow2(runtime, 0,
 336                 SNDRV_PCM_HW_PARAM_PERIODS);
 337         if (err < 0)
 338                 goto _error;
 339
 340         chip->substream = substream;
 341
 342         runtime->hw = snd_cx23885_digital_hw;
 343
 344         if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
 345                 DEFAULT_FIFO_SIZE) {
 346                 unsigned int bpl = chip->dev->
 347                         sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4;
 348                 bpl &= ~7; /* must be multiple of 8 */
 349                 runtime->hw.period_bytes_min = bpl;
 350                 runtime->hw.period_bytes_max = bpl;
 351         }
 352
 353         return 0;
 354 _error:
 355         dprintk(1, "Error opening PCM!\n");
 356         return err;
 357 }
 358
 359 /*
 360  * audio close callback
 361  */
 362 static int snd_cx23885_close(struct snd_pcm_substream *substream)
 363 {
 364         return 0;
 365 }
 366
 367
 368 /*
 369  * hw_params callback
 370  */
 371 static int snd_cx23885_hw_params(struct snd_pcm_substream *substream,
 372                               struct snd_pcm_hw_params *hw_params)
 373 {
 374         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 375         struct cx23885_audio_buffer *buf;
 376         int ret;
 377
 378         if (substream->runtime->dma_area) {
 379                 dsp_buffer_free(chip);
 380                 substream->runtime->dma_area = NULL;
 381         }
 382
 383         chip->period_size = params_period_bytes(hw_params);
 384         chip->num_periods = params_periods(hw_params);
 385         chip->dma_size = chip->period_size * params_periods(hw_params);
 386
 387         BUG_ON(!chip->dma_size);
 388         BUG_ON(chip->num_periods & (chip->num_periods-1));
 389
 390         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 391         if (NULL == buf)
 392                 return -ENOMEM;
 393
 394         buf->bpl = chip->period_size;
 395         chip->buf = buf;
 396
 397         ret = cx23885_alsa_dma_init(chip,
 398                         (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
 399         if (ret < 0)
 400                 goto error;
 401
 402         ret = cx23885_alsa_dma_map(chip);
 403         if (ret < 0)
 404                 goto error;
 405
 406         ret = cx23885_risc_databuffer(chip->pci, &buf->risc, buf->sglist,
 407                                    chip->period_size, chip->num_periods, 1);
 408         if (ret < 0)
 409                 goto error;
 410
 411         /* Loop back to start of program */
 412         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC);
 413         buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 414         buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
 415
 416         substream->runtime->dma_area = chip->buf->vaddr;
 417         substream->runtime->dma_bytes = chip->dma_size;
 418         substream->runtime->dma_addr = 0;
 419
 420         return 0;
 421
 422 error:
 423         kfree(buf);
 424         chip->buf = NULL;
 425         return ret;
 426 }
 427
 428 /*
 429  * hw free callback
 430  */
 431 static int snd_cx23885_hw_free(struct snd_pcm_substream *substream)
 432 {
 433
 434         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 435
 436         if (substream->runtime->dma_area) {
 437                 dsp_buffer_free(chip);
 438                 substream->runtime->dma_area = NULL;
 439         }
 440
 441         return 0;
 442 }
 443
 444 /*
 445  * prepare callback
 446  */
 447 static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
 448 {
 449         return 0;
 450 }
 451
 452 /*
 453  * trigger callback
 454  */
 455 static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream,
 456         int cmd)
 457 {
 458         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 459         int err;
 460
 461         /* Local interrupts are already disabled by ALSA */
 462         spin_lock(&chip->lock);
 463
 464         switch (cmd) {
 465         case SNDRV_PCM_TRIGGER_START:
 466                 err = cx23885_start_audio_dma(chip);
 467                 break;
 468         case SNDRV_PCM_TRIGGER_STOP:
 469                 err = cx23885_stop_audio_dma(chip);
 470                 break;
 471         default:
 472                 err = -EINVAL;
 473                 break;
 474         }
 475
 476         spin_unlock(&chip->lock);
 477
 478         return err;
 479 }
 480
 481 /*
 482  * pointer callback
 483  */
 484 static snd_pcm_uframes_t snd_cx23885_pointer(
 485         struct snd_pcm_substream *substream)
 486 {
 487         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 488         struct snd_pcm_runtime *runtime = substream->runtime;
 489         u16 count;
 490
 491         count = atomic_read(&chip->count);
 492
 493         return runtime->period_size * (count & (runtime->periods-1));
 494 }
 495
 496 /*
 497  * page callback (needed for mmap)
 498  */
 499 static struct page *snd_cx23885_page(struct snd_pcm_substream *substream,
 500                                 unsigned long offset)
 501 {
 502         void *pageptr = substream->runtime->dma_area + offset;
 503         return vmalloc_to_page(pageptr);
 504 }
 505
 506 /*
 507  * operators
 508  */
 509 static struct snd_pcm_ops snd_cx23885_pcm_ops = {
 510         .open = snd_cx23885_pcm_open,
 511         .close = snd_cx23885_close,
 512         .ioctl = snd_pcm_lib_ioctl,
 513         .hw_params = snd_cx23885_hw_params,
 514         .hw_free = snd_cx23885_hw_free,
 515         .prepare = snd_cx23885_prepare,
 516         .trigger = snd_cx23885_card_trigger,
 517         .pointer = snd_cx23885_pointer,
 518         .page = snd_cx23885_page,
 519 };
 520
 521 /*
 522  * create a PCM device
 523  */
 524 static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device,
 525         char *name)
 526 {
 527         int err;
 528         struct snd_pcm *pcm;
 529
 530         err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
 531         if (err < 0)
 532                 return err;
 533         pcm->private_data = chip;
 534         strcpy(pcm->name, name);
 535         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops);
 536
 537         return 0;
 538 }
 539
 540 /****************************************************************************
 541                         Basic Flow for Sound Devices
 542  ****************************************************************************/
 543
 544 /*
 545  * Alsa Constructor - Component probe
 546  */
 547
 548 struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev)
 549 {
 550         struct snd_card *card;
 551         struct cx23885_audio_dev *chip;
 552         int err;
 553
 554         if (disable_analog_audio)
 555                 return NULL;
 556
 557         if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) {
 558                 printk(KERN_WARNING "%s(): Missing SRAM channel configuration "
 559                         "for analog TV Audio\n", __func__);
 560                 return NULL;
 561         }
 562
 563         err = snd_card_new(&dev->pci->dev,
 564                            SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 565                         THIS_MODULE, sizeof(struct cx23885_audio_dev), &card);
 566         if (err < 0)
 567                 goto error;
 568
 569         chip = (struct cx23885_audio_dev *) card->private_data;
 570         chip->dev = dev;
 571         chip->pci = dev->pci;
 572         chip->card = card;
 573         spin_lock_init(&chip->lock);
 574
 575         err = snd_cx23885_pcm(chip, 0, "CX23885 Digital");
 576         if (err < 0)
 577                 goto error;
 578
 579         strcpy(card->driver, "CX23885");
 580         sprintf(card->shortname, "Conexant CX23885");
 581         sprintf(card->longname, "%s at %s", card->shortname, dev->name);
 582
 583         err = snd_card_register(card);
 584         if (err < 0)
 585                 goto error;
 586
 587         dprintk(0, "registered ALSA audio device\n");
 588
 589         return chip;
 590
 591 error:
 592         snd_card_free(card);
 593         printk(KERN_ERR "%s(): Failed to register analog "
 594                         "audio adapter\n", __func__);
 595
 596         return NULL;
 597 }
 598
 599 /*
 600  * ALSA destructor
 601  */
 602 void cx23885_audio_unregister(struct cx23885_dev *dev)
 603 {
 604         struct cx23885_audio_dev *chip = dev->audio_dev;
 605
 606         snd_card_free(chip->card);
 607 }