linux/drivers/media/pci/cx23885/cx23885-alsa.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *
   4 *  Support for CX23885 analog audio capture
   5 *
   6 *    (c) 2008 Mijhail Moreyra <mijhail.moreyra@gmail.com>
   7 *    Adapted from cx88-alsa.c
   8 *    (c) 2009 Steven Toth <stoth@kernellabs.com>
   9 */
  10
  11#include "cx23885.h"
  12#include "cx23885-reg.h"
  13
  14#include <linux/module.h>
  15#include <linux/init.h>
  16#include <linux/device.h>
  17#include <linux/interrupt.h>
  18#include <linux/vmalloc.h>
  19#include <linux/dma-mapping.h>
  20#include <linux/pci.h>
  21
  22#include <asm/delay.h>
  23
  24#include <sound/core.h>
  25#include <sound/pcm.h>
  26#include <sound/pcm_params.h>
  27#include <sound/control.h>
  28#include <sound/initval.h>
  29
  30#include <sound/tlv.h>
  31
  32#define AUDIO_SRAM_CHANNEL      SRAM_CH07
  33
  34#define dprintk(level, fmt, arg...) do {                                \
  35        if (audio_debug + 1 > level)                                    \
  36                printk(KERN_DEBUG pr_fmt("%s: alsa: " fmt), \
  37                        chip->dev->name, ##arg); \
  38} while(0)
  39
  40/****************************************************************************
  41                        Module global static vars
  42 ****************************************************************************/
  43
  44static unsigned int disable_analog_audio;
  45module_param(disable_analog_audio, int, 0644);
  46MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver");
  47
  48static unsigned int audio_debug;
  49module_param(audio_debug, int, 0644);
  50MODULE_PARM_DESC(audio_debug, "enable debug messages [analog audio]");
  51
  52/****************************************************************************
  53                        Board specific functions
  54 ****************************************************************************/
  55
  56/* Constants taken from cx88-reg.h */
  57#define AUD_INT_DN_RISCI1       (1 <<  0)
  58#define AUD_INT_UP_RISCI1       (1 <<  1)
  59#define AUD_INT_RDS_DN_RISCI1   (1 <<  2)
  60#define AUD_INT_DN_RISCI2       (1 <<  4) /* yes, 3 is skipped */
  61#define AUD_INT_UP_RISCI2       (1 <<  5)
  62#define AUD_INT_RDS_DN_RISCI2   (1 <<  6)
  63#define AUD_INT_DN_SYNC         (1 << 12)
  64#define AUD_INT_UP_SYNC         (1 << 13)
  65#define AUD_INT_RDS_DN_SYNC     (1 << 14)
  66#define AUD_INT_OPC_ERR         (1 << 16)
  67#define AUD_INT_BER_IRQ         (1 << 20)
  68#define AUD_INT_MCHG_IRQ        (1 << 21)
  69#define GP_COUNT_CONTROL_RESET  0x3
  70
  71static int cx23885_alsa_dma_init(struct cx23885_audio_dev *chip,
  72                                 unsigned long nr_pages)
  73{
  74        struct cx23885_audio_buffer *buf = chip->buf;
  75        struct page *pg;
  76        int i;
  77
  78        buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
  79        if (NULL == buf->vaddr) {
  80                dprintk(1, "vmalloc_32(%lu pages) failed\n", nr_pages);
  81                return -ENOMEM;
  82        }
  83
  84        dprintk(1, "vmalloc is at addr %p, size=%lu\n",
  85                buf->vaddr, nr_pages << PAGE_SHIFT);
  86
  87        memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
  88        buf->nr_pages = nr_pages;
  89
  90        buf->sglist = vzalloc(array_size(sizeof(*buf->sglist), buf->nr_pages));
  91        if (NULL == buf->sglist)
  92                goto vzalloc_err;
  93
  94        sg_init_table(buf->sglist, buf->nr_pages);
  95        for (i = 0; i < buf->nr_pages; i++) {
  96                pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
  97                if (NULL == pg)
  98                        goto vmalloc_to_page_err;
  99                sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
 100        }
 101        return 0;
 102
 103vmalloc_to_page_err:
 104        vfree(buf->sglist);
 105        buf->sglist = NULL;
 106vzalloc_err:
 107        vfree(buf->vaddr);
 108        buf->vaddr = NULL;
 109        return -ENOMEM;
 110}
 111
 112static int cx23885_alsa_dma_map(struct cx23885_audio_dev *dev)
 113{
 114        struct cx23885_audio_buffer *buf = dev->buf;
 115
 116        buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist,
 117                        buf->nr_pages, DMA_FROM_DEVICE);
 118
 119        if (0 == buf->sglen) {
 120                pr_warn("%s: cx23885_alsa_map_sg failed\n", __func__);
 121                return -ENOMEM;
 122        }
 123        return 0;
 124}
 125
 126static int cx23885_alsa_dma_unmap(struct cx23885_audio_dev *dev)
 127{
 128        struct cx23885_audio_buffer *buf = dev->buf;
 129
 130        if (!buf->sglen)
 131                return 0;
 132
 133        dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->nr_pages, DMA_FROM_DEVICE);
 134        buf->sglen = 0;
 135        return 0;
 136}
 137
 138static int cx23885_alsa_dma_free(struct cx23885_audio_buffer *buf)
 139{
 140        vfree(buf->sglist);
 141        buf->sglist = NULL;
 142        vfree(buf->vaddr);
 143        buf->vaddr = NULL;
 144        return 0;
 145}
 146
 147/*
 148 * BOARD Specific: Sets audio DMA
 149 */
 150
 151static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip)
 152{
 153        struct cx23885_audio_buffer *buf = chip->buf;
 154        struct cx23885_dev *dev  = chip->dev;
 155        struct sram_channel *audio_ch =
 156                &dev->sram_channels[AUDIO_SRAM_CHANNEL];
 157
 158        dprintk(1, "%s()\n", __func__);
 159
 160        /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
 161        cx_clear(AUD_INT_DMA_CTL, 0x11);
 162
 163        /* setup fifo + format - out channel */
 164        cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl,
 165                buf->risc.dma);
 166
 167        /* sets bpl size */
 168        cx_write(AUD_INT_A_LNGTH, buf->bpl);
 169
 170        /* This is required to get good audio (1 seems to be ok) */
 171        cx_write(AUD_INT_A_MODE, 1);
 172
 173        /* reset counter */
 174        cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 175        atomic_set(&chip->count, 0);
 176
 177        dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d byte buffer\n",
 178                buf->bpl, cx_read(audio_ch->cmds_start+12)>>1,
 179                chip->num_periods, buf->bpl * chip->num_periods);
 180
 181        /* Enables corresponding bits at AUD_INT_STAT */
 182        cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 183                                    AUD_INT_DN_RISCI1);
 184
 185        /* Clean any pending interrupt bits already set */
 186        cx_write(AUDIO_INT_INT_STAT, ~0);
 187
 188        /* enable audio irqs */
 189        cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
 190
 191        /* start dma */
 192        cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */
 193        cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and
 194                                          RISC enable */
 195        if (audio_debug)
 196                cx23885_sram_channel_dump(chip->dev, audio_ch);
 197
 198        return 0;
 199}
 200
 201/*
 202 * BOARD Specific: Resets audio DMA
 203 */
 204static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip)
 205{
 206        struct cx23885_dev *dev = chip->dev;
 207        dprintk(1, "Stopping audio DMA\n");
 208
 209        /* stop dma */
 210        cx_clear(AUD_INT_DMA_CTL, 0x11);
 211
 212        /* disable irqs */
 213        cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
 214        cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 215                                    AUD_INT_DN_RISCI1);
 216
 217        if (audio_debug)
 218                cx23885_sram_channel_dump(chip->dev,
 219                        &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 220
 221        return 0;
 222}
 223
 224/*
 225 * BOARD Specific: Handles audio IRQ
 226 */
 227int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask)
 228{
 229        struct cx23885_audio_dev *chip = dev->audio_dev;
 230
 231        if (0 == (status & mask))
 232                return 0;
 233
 234        cx_write(AUDIO_INT_INT_STAT, status);
 235
 236        /* risc op code error */
 237        if (status & AUD_INT_OPC_ERR) {
 238                pr_warn("%s/1: Audio risc op code error\n",
 239                        dev->name);
 240                cx_clear(AUD_INT_DMA_CTL, 0x11);
 241                cx23885_sram_channel_dump(dev,
 242                        &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 243        }
 244        if (status & AUD_INT_DN_SYNC) {
 245                dprintk(1, "Downstream sync error\n");
 246                cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 247                return 1;
 248        }
 249        /* risc1 downstream */
 250        if (status & AUD_INT_DN_RISCI1) {
 251                atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT));
 252                snd_pcm_period_elapsed(chip->substream);
 253        }
 254        /* FIXME: Any other status should deserve a special handling? */
 255
 256        return 1;
 257}
 258
 259static int dsp_buffer_free(struct cx23885_audio_dev *chip)
 260{
 261        struct cx23885_riscmem *risc;
 262
 263        BUG_ON(!chip->dma_size);
 264
 265        dprintk(2, "Freeing buffer\n");
 266        cx23885_alsa_dma_unmap(chip);
 267        cx23885_alsa_dma_free(chip->buf);
 268        risc = &chip->buf->risc;
 269        dma_free_coherent(&chip->pci->dev, risc->size, risc->cpu, risc->dma);
 270        kfree(chip->buf);
 271
 272        chip->buf = NULL;
 273        chip->dma_size = 0;
 274
 275        return 0;
 276}
 277
 278/****************************************************************************
 279                                ALSA PCM Interface
 280 ****************************************************************************/
 281
 282/*
 283 * Digital hardware definition
 284 */
 285#define DEFAULT_FIFO_SIZE       4096
 286
 287static const struct snd_pcm_hardware snd_cx23885_digital_hw = {
 288        .info = SNDRV_PCM_INFO_MMAP |
 289                SNDRV_PCM_INFO_INTERLEAVED |
 290                SNDRV_PCM_INFO_BLOCK_TRANSFER |
 291                SNDRV_PCM_INFO_MMAP_VALID,
 292        .formats = SNDRV_PCM_FMTBIT_S16_LE,
 293
 294        .rates =                SNDRV_PCM_RATE_48000,
 295        .rate_min =             48000,
 296        .rate_max =             48000,
 297        .channels_min = 2,
 298        .channels_max = 2,
 299        /* Analog audio output will be full of clicks and pops if there
 300           are not exactly four lines in the SRAM FIFO buffer.  */
 301        .period_bytes_min = DEFAULT_FIFO_SIZE/4,
 302        .period_bytes_max = DEFAULT_FIFO_SIZE/4,
 303        .periods_min = 1,
 304        .periods_max = 1024,
 305        .buffer_bytes_max = (1024*1024),
 306};
 307
 308/*
 309 * audio pcm capture open callback
 310 */
 311static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream)
 312{
 313        struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 314        struct snd_pcm_runtime *runtime = substream->runtime;
 315        int err;
 316
 317        if (!chip) {
 318                pr_err("BUG: cx23885 can't find device struct. Can't proceed with open\n");
 319                return -ENODEV;
 320        }
 321
 322        err = snd_pcm_hw_constraint_pow2(runtime, 0,
 323                SNDRV_PCM_HW_PARAM_PERIODS);
 324        if (err < 0)
 325                goto _error;
 326
 327        chip->substream = substream;
 328
 329        runtime->hw = snd_cx23885_digital_hw;
 330
 331        if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
 332                DEFAULT_FIFO_SIZE) {
 333                unsigned int bpl = chip->dev->
 334                        sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4;
 335                bpl &= ~7; /* must be multiple of 8 */
 336                runtime->hw.period_bytes_min = bpl;
 337                runtime->hw.period_bytes_max = bpl;
 338        }
 339
 340        return 0;
 341_error:
 342        dprintk(1, "Error opening PCM!\n");
 343        return err;
 344}
 345
 346/*
 347 * audio close callback
 348 */
 349static int snd_cx23885_close(struct snd_pcm_substream *substream)
 350{
 351        return 0;
 352}
 353
 354
 355/*
 356 * hw_params callback
 357 */
 358static int snd_cx23885_hw_params(struct snd_pcm_substream *substream,
 359                              struct snd_pcm_hw_params *hw_params)
 360{
 361        struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 362        struct cx23885_audio_buffer *buf;
 363        int ret;
 364
 365        if (substream->runtime->dma_area) {
 366                dsp_buffer_free(chip);
 367                substream->runtime->dma_area = NULL;
 368        }
 369
 370        chip->period_size = params_period_bytes(hw_params);
 371        chip->num_periods = params_periods(hw_params);
 372        chip->dma_size = chip->period_size * params_periods(hw_params);
 373
 374        BUG_ON(!chip->dma_size);
 375        BUG_ON(chip->num_periods & (chip->num_periods-1));
 376
 377        buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 378        if (NULL == buf)
 379                return -ENOMEM;
 380
 381        buf->bpl = chip->period_size;
 382        chip->buf = buf;
 383
 384        ret = cx23885_alsa_dma_init(chip,
 385                        (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
 386        if (ret < 0)
 387                goto error;
 388
 389        ret = cx23885_alsa_dma_map(chip);
 390        if (ret < 0)
 391                goto error;
 392
 393        ret = cx23885_risc_databuffer(chip->pci, &buf->risc, buf->sglist,
 394                                   chip->period_size, chip->num_periods, 1);
 395        if (ret < 0)
 396                goto error;
 397
 398        /* Loop back to start of program */
 399        buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC);
 400        buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 401        buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
 402
 403        substream->runtime->dma_area = chip->buf->vaddr;
 404        substream->runtime->dma_bytes = chip->dma_size;
 405        substream->runtime->dma_addr = 0;
 406
 407        return 0;
 408
 409error:
 410        kfree(buf);
 411        chip->buf = NULL;
 412        return ret;
 413}
 414
 415/*
 416 * hw free callback
 417 */
 418static int snd_cx23885_hw_free(struct snd_pcm_substream *substream)
 419{
 420
 421        struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 422
 423        if (substream->runtime->dma_area) {
 424                dsp_buffer_free(chip);
 425                substream->runtime->dma_area = NULL;
 426        }
 427
 428        return 0;
 429}
 430
 431/*
 432 * prepare callback
 433 */
 434static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
 435{
 436        return 0;
 437}
 438
 439/*
 440 * trigger callback
 441 */
 442static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream,
 443        int cmd)
 444{
 445        struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 446        int err;
 447
 448        /* Local interrupts are already disabled by ALSA */
 449        spin_lock(&chip->lock);
 450
 451        switch (cmd) {
 452        case SNDRV_PCM_TRIGGER_START:
 453                err = cx23885_start_audio_dma(chip);
 454                break;
 455        case SNDRV_PCM_TRIGGER_STOP:
 456                err = cx23885_stop_audio_dma(chip);
 457                break;
 458        default:
 459                err = -EINVAL;
 460                break;
 461        }
 462
 463        spin_unlock(&chip->lock);
 464
 465        return err;
 466}
 467
 468/*
 469 * pointer callback
 470 */
 471static snd_pcm_uframes_t snd_cx23885_pointer(
 472        struct snd_pcm_substream *substream)
 473{
 474        struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 475        struct snd_pcm_runtime *runtime = substream->runtime;
 476        u16 count;
 477
 478        count = atomic_read(&chip->count);
 479
 480        return runtime->period_size * (count & (runtime->periods-1));
 481}
 482
 483/*
 484 * page callback (needed for mmap)
 485 */
 486static struct page *snd_cx23885_page(struct snd_pcm_substream *substream,
 487                                unsigned long offset)
 488{
 489        void *pageptr = substream->runtime->dma_area + offset;
 490        return vmalloc_to_page(pageptr);
 491}
 492
 493/*
 494 * operators
 495 */
 496static const struct snd_pcm_ops snd_cx23885_pcm_ops = {
 497        .open = snd_cx23885_pcm_open,
 498        .close = snd_cx23885_close,
 499        .hw_params = snd_cx23885_hw_params,
 500        .hw_free = snd_cx23885_hw_free,
 501        .prepare = snd_cx23885_prepare,
 502        .trigger = snd_cx23885_card_trigger,
 503        .pointer = snd_cx23885_pointer,
 504        .page = snd_cx23885_page,
 505};
 506
 507/*
 508 * create a PCM device
 509 */
 510static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device,
 511        char *name)
 512{
 513        int err;
 514        struct snd_pcm *pcm;
 515
 516        err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
 517        if (err < 0)
 518                return err;
 519        pcm->private_data = chip;
 520        strscpy(pcm->name, name, sizeof(pcm->name));
 521        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops);
 522
 523        return 0;
 524}
 525
 526/****************************************************************************
 527                        Basic Flow for Sound Devices
 528 ****************************************************************************/
 529
 530/*
 531 * Alsa Constructor - Component probe
 532 */
 533
 534struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev)
 535{
 536        struct snd_card *card;
 537        struct cx23885_audio_dev *chip;
 538        int err;
 539
 540        if (disable_analog_audio)
 541                return NULL;
 542
 543        if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) {
 544                pr_warn("%s(): Missing SRAM channel configuration for analog TV Audio\n",
 545                       __func__);
 546                return NULL;
 547        }
 548
 549        err = snd_card_new(&dev->pci->dev,
 550                           SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 551                        THIS_MODULE, sizeof(struct cx23885_audio_dev), &card);
 552        if (err < 0)
 553                goto error;
 554
 555        chip = (struct cx23885_audio_dev *) card->private_data;
 556        chip->dev = dev;
 557        chip->pci = dev->pci;
 558        chip->card = card;
 559        spin_lock_init(&chip->lock);
 560
 561        err = snd_cx23885_pcm(chip, 0, "CX23885 Digital");
 562        if (err < 0)
 563                goto error;
 564
 565        strscpy(card->driver, "CX23885", sizeof(card->driver));
 566        sprintf(card->shortname, "Conexant CX23885");
 567        sprintf(card->longname, "%s at %s", card->shortname, dev->name);
 568
 569        err = snd_card_register(card);
 570        if (err < 0)
 571                goto error;
 572
 573        dprintk(0, "registered ALSA audio device\n");
 574
 575        return chip;
 576
 577error:
 578        snd_card_free(card);
 579        pr_err("%s(): Failed to register analog audio adapter\n",
 580               __func__);
 581
 582        return NULL;
 583}
 584
 585/*
 586 * ALSA destructor
 587 */
 588void cx23885_audio_unregister(struct cx23885_dev *dev)
 589{
 590        struct cx23885_audio_dev *chip = dev->audio_dev;
 591
 592        snd_card_free(chip->card);
 593}
 594