LXR linux/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
  60static unsigned int disable_analog_audio;
  61module_param(disable_analog_audio, int, 0644);
  62MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver");
  63
  64static unsigned int audio_debug;
  65module_param(audio_debug, int, 0644);
  66MODULE_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
  91static 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 */
 144static 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 */
 167int 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
 199static 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
 224static 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 */
 248static 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 */
 287static int snd_cx23885_close(struct snd_pcm_substream *substream)
 288{
 289        return 0;
 290}
 291
 292/*
 293 * hw_params callback
 294 */
 295static 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
 352error:
 353        kfree(buf);
 354        return ret;
 355}
 356
 357/*
 358 * hw free callback
 359 */
 360static 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 */
 376static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
 377{
 378        return 0;
 379}
 380
 381/*
 382 * trigger callback
 383 */
 384static 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 */
 413static 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 */
 428static 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 */
 438static 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 */
 453static 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
 477struct 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_new(&dev->pci->dev,
 493                           SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 494                        THIS_MODULE, sizeof(struct cx23885_audio_dev), &card);
 495        if (err < 0)
 496                goto error;
 497
 498        chip = (struct cx23885_audio_dev *) card->private_data;
 499        chip->dev = dev;
 500        chip->pci = dev->pci;
 501        chip->card = card;
 502        spin_lock_init(&chip->lock);
 503
 504        err = snd_cx23885_pcm(chip, 0, "CX23885 Digital");
 505        if (err < 0)
 506                goto error;
 507
 508        strcpy(card->driver, "CX23885");
 509        sprintf(card->shortname, "Conexant CX23885");
 510        sprintf(card->longname, "%s at %s", card->shortname, dev->name);
 511
 512        err = snd_card_register(card);
 513        if (err < 0)
 514                goto error;
 515
 516        dprintk(0, "registered ALSA audio device\n");
 517
 518        return chip;
 519
 520error:
 521        snd_card_free(card);
 522        printk(KERN_ERR "%s(): Failed to register analog "
 523                        "audio adapter\n", __func__);
 524
 525        return NULL;
 526}
 527
 528/*
 529 * ALSA destructor
 530 */
 531void cx23885_audio_unregister(struct cx23885_dev *dev)
 532{
 533        struct cx23885_audio_dev *chip = dev->audio_dev;
 534
 535        snd_card_free(chip->card);
 536}
 537