linux/drivers/media/pci/cx23885/cx23885-alsa.c
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   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, int nr_pages)
  72{
  73        struct cx23885_audio_buffer *buf = chip->buf;
  74        struct page *pg;
  75        int i;
  76
  77        buf->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
  78        if (NULL == buf->vaddr) {
  79                dprintk(1, "vmalloc_32(%d pages) failed\n", nr_pages);
  80                return -ENOMEM;
  81        }
  82
  83        dprintk(1, "vmalloc is at addr %p, size=%d\n",
  84                buf->vaddr, nr_pages << PAGE_SHIFT);
  85
  86        memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
  87        buf->nr_pages = nr_pages;
  88
  89        buf->sglist = vzalloc(array_size(sizeof(*buf->sglist), buf->nr_pages));
  90        if (NULL == buf->sglist)
  91                goto vzalloc_err;
  92
  93        sg_init_table(buf->sglist, buf->nr_pages);
  94        for (i = 0; i < buf->nr_pages; i++) {
  95                pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
  96                if (NULL == pg)
  97                        goto vmalloc_to_page_err;
  98                sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
  99        }
 100        return 0;
 101
 102vmalloc_to_page_err:
 103        vfree(buf->sglist);
 104        buf->sglist = NULL;
 105vzalloc_err:
 106        vfree(buf->vaddr);
 107        buf->vaddr = NULL;
 108        return -ENOMEM;
 109}
 110
 111static int cx23885_alsa_dma_map(struct cx23885_audio_dev *dev)
 112{
 113        struct cx23885_audio_buffer *buf = dev->buf;
 114
 115        buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist,
 116                        buf->nr_pages, PCI_DMA_FROMDEVICE);
 117
 118        if (0 == buf->sglen) {
 119                pr_warn("%s: cx23885_alsa_map_sg failed\n", __func__);
 120                return -ENOMEM;
 121        }
 122        return 0;
 123}
 124
 125static int cx23885_alsa_dma_unmap(struct cx23885_audio_dev *dev)
 126{
 127        struct cx23885_audio_buffer *buf = dev->buf;
 128
 129        if (!buf->sglen)
 130                return 0;
 131
 132        dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE);
 133        buf->sglen = 0;
 134        return 0;
 135}
 136
 137static int cx23885_alsa_dma_free(struct cx23885_audio_buffer *buf)
 138{
 139        vfree(buf->sglist);
 140        buf->sglist = NULL;
 141        vfree(buf->vaddr);
 142        buf->vaddr = NULL;
 143        return 0;
 144}
 145
 146/*
 147 * BOARD Specific: Sets audio DMA
 148 */
 149
 150static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip)
 151{
 152        struct cx23885_audio_buffer *buf = chip->buf;
 153        struct cx23885_dev *dev  = chip->dev;
 154        struct sram_channel *audio_ch =
 155                &dev->sram_channels[AUDIO_SRAM_CHANNEL];
 156
 157        dprintk(1, "%s()\n", __func__);
 158
 159        /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
 160        cx_clear(AUD_INT_DMA_CTL, 0x11);
 161
 162        /* setup fifo + format - out channel */
 163        cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl,
 164                buf->risc.dma);
 165
 166        /* sets bpl size */
 167        cx_write(AUD_INT_A_LNGTH, buf->bpl);
 168
 169        /* This is required to get good audio (1 seems to be ok) */
 170        cx_write(AUD_INT_A_MODE, 1);
 171
 172        /* reset counter */
 173        cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 174        atomic_set(&chip->count, 0);
 175
 176        dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d byte buffer\n",
 177                buf->bpl, cx_read(audio_ch->cmds_start+12)>>1,
 178                chip->num_periods, buf->bpl * chip->num_periods);
 179
 180        /* Enables corresponding bits at AUD_INT_STAT */
 181        cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 182                                    AUD_INT_DN_RISCI1);
 183
 184        /* Clean any pending interrupt bits already set */
 185        cx_write(AUDIO_INT_INT_STAT, ~0);
 186
 187        /* enable audio irqs */
 188        cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
 189
 190        /* start dma */
 191        cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */
 192        cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and
 193                                          RISC enable */
 194        if (audio_debug)
 195                cx23885_sram_channel_dump(chip->dev, audio_ch);
 196
 197        return 0;
 198}
 199
 200/*
 201 * BOARD Specific: Resets audio DMA
 202 */
 203static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip)
 204{
 205        struct cx23885_dev *dev = chip->dev;
 206        dprintk(1, "Stopping audio DMA\n");
 207
 208        /* stop dma */
 209        cx_clear(AUD_INT_DMA_CTL, 0x11);
 210
 211        /* disable irqs */
 212        cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
 213        cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 214                                    AUD_INT_DN_RISCI1);
 215
 216        if (audio_debug)
 217                cx23885_sram_channel_dump(chip->dev,
 218                        &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 219
 220        return 0;
 221}
 222
 223/*
 224 * BOARD Specific: Handles audio IRQ
 225 */
 226int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask)
 227{
 228        struct cx23885_audio_dev *chip = dev->audio_dev;
 229
 230        if (0 == (status & mask))
 231                return 0;
 232
 233        cx_write(AUDIO_INT_INT_STAT, status);
 234
 235        /* risc op code error */
 236        if (status & AUD_INT_OPC_ERR) {
 237                pr_warn("%s/1: Audio risc op code error\n",
 238                        dev->name);
 239                cx_clear(AUD_INT_DMA_CTL, 0x11);
 240                cx23885_sram_channel_dump(dev,
 241                        &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 242        }
 243        if (status & AUD_INT_DN_SYNC) {
 244                dprintk(1, "Downstream sync error\n");
 245                cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 246                return 1;
 247        }
 248        /* risc1 downstream */
 249        if (status & AUD_INT_DN_RISCI1) {
 250                atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT));
 251                snd_pcm_period_elapsed(chip->substream);
 252        }
 253        /* FIXME: Any other status should deserve a special handling? */
 254
 255        return 1;
 256}
 257
 258static int dsp_buffer_free(struct cx23885_audio_dev *chip)
 259{
 260        struct cx23885_riscmem *risc;
 261
 262        BUG_ON(!chip->dma_size);
 263
 264        dprintk(2, "Freeing buffer\n");
 265        cx23885_alsa_dma_unmap(chip);
 266        cx23885_alsa_dma_free(chip->buf);
 267        risc = &chip->buf->risc;
 268        pci_free_consistent(chip->pci, risc->size, risc->cpu, risc->dma);
 269        kfree(chip->buf);
 270
 271        chip->buf = NULL;
 272        chip->dma_size = 0;
 273
 274        return 0;
 275}
 276
 277/****************************************************************************
 278                                ALSA PCM Interface
 279 ****************************************************************************/
 280
 281/*
 282 * Digital hardware definition
 283 */
 284#define DEFAULT_FIFO_SIZE       4096
 285
 286static const struct snd_pcm_hardware snd_cx23885_digital_hw = {
 287        .info = SNDRV_PCM_INFO_MMAP |
 288                SNDRV_PCM_INFO_INTERLEAVED |
 289                SNDRV_PCM_INFO_BLOCK_TRANSFER |
 290                SNDRV_PCM_INFO_MMAP_VALID,
 291        .formats = SNDRV_PCM_FMTBIT_S16_LE,
 292
 293        .rates =                SNDRV_PCM_RATE_48000,
 294        .rate_min =             48000,
 295        .rate_max =             48000,
 296        .channels_min = 2,
 297        .channels_max = 2,
 298        /* Analog audio output will be full of clicks and pops if there
 299           are not exactly four lines in the SRAM FIFO buffer.  */
 300        .period_bytes_min = DEFAULT_FIFO_SIZE/4,
 301        .period_bytes_max = DEFAULT_FIFO_SIZE/4,
 302        .periods_min = 1,
 303        .periods_max = 1024,
 304        .buffer_bytes_max = (1024*1024),
 305};
 306
 307/*
 308 * audio pcm capture open callback
 309 */
 310static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream)
 311{
 312        struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 313        struct snd_pcm_runtime *runtime = substream->runtime;
 314        int err;
 315
 316        if (!chip) {
 317                pr_err("BUG: cx23885 can't find device struct. Can't proceed with open\n");
 318                return -ENODEV;
 319        }
 320
 321        err = snd_pcm_hw_constraint_pow2(runtime, 0,
 322                SNDRV_PCM_HW_PARAM_PERIODS);
 323        if (err < 0)
 324                goto _error;
 325
 326        chip->substream = substream;
 327
 328        runtime->hw = snd_cx23885_digital_hw;
 329
 330        if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
 331                DEFAULT_FIFO_SIZE) {
 332                unsigned int bpl = chip->dev->
 333                        sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4;
 334                bpl &= ~7; /* must be multiple of 8 */
 335                runtime->hw.period_bytes_min = bpl;
 336                runtime->hw.period_bytes_max = bpl;
 337        }
 338
 339        return 0;
 340_error:
 341        dprintk(1, "Error opening PCM!\n");
 342        return err;
 343}
 344
 345/*
 346 * audio close callback
 347 */
 348static int snd_cx23885_close(struct snd_pcm_substream *substream)
 349{
 350        return 0;
 351}
 352
 353
 354/*
 355 * hw_params callback
 356 */
 357static int snd_cx23885_hw_params(struct snd_pcm_substream *substream,
 358                              struct snd_pcm_hw_params *hw_params)
 359{
 360        struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 361        struct cx23885_audio_buffer *buf;
 362        int ret;
 363
 364        if (substream->runtime->dma_area) {
 365                dsp_buffer_free(chip);
 366                substream->runtime->dma_area = NULL;
 367        }
 368
 369        chip->period_size = params_period_bytes(hw_params);
 370        chip->num_periods = params_periods(hw_params);
 371        chip->dma_size = chip->period_size * params_periods(hw_params);
 372
 373        BUG_ON(!chip->dma_size);
 374        BUG_ON(chip->num_periods & (chip->num_periods-1));
 375
 376        buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 377        if (NULL == buf)
 378                return -ENOMEM;
 379
 380        buf->bpl = chip->period_size;
 381        chip->buf = buf;
 382
 383        ret = cx23885_alsa_dma_init(chip,
 384                        (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
 385        if (ret < 0)
 386                goto error;
 387
 388        ret = cx23885_alsa_dma_map(chip);
 389        if (ret < 0)
 390                goto error;
 391
 392        ret = cx23885_risc_databuffer(chip->pci, &buf->risc, buf->sglist,
 393                                   chip->period_size, chip->num_periods, 1);
 394        if (ret < 0)
 395                goto error;
 396
 397        /* Loop back to start of program */
 398        buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC);
 399        buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 400        buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
 401
 402        substream->runtime->dma_area = chip->buf->vaddr;
 403        substream->runtime->dma_bytes = chip->dma_size;
 404        substream->runtime->dma_addr = 0;
 405
 406        return 0;
 407
 408error:
 409        kfree(buf);
 410        chip->buf = NULL;
 411        return ret;
 412}
 413
 414/*
 415 * hw free callback
 416 */
 417static int snd_cx23885_hw_free(struct snd_pcm_substream *substream)
 418{
 419
 420        struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 421
 422        if (substream->runtime->dma_area) {
 423                dsp_buffer_free(chip);
 424                substream->runtime->dma_area = NULL;
 425        }
 426
 427        return 0;
 428}
 429
 430/*
 431 * prepare callback
 432 */
 433static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
 434{
 435        return 0;
 436}
 437
 438/*
 439 * trigger callback
 440 */
 441static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream,
 442        int cmd)
 443{
 444        struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 445        int err;
 446
 447        /* Local interrupts are already disabled by ALSA */
 448        spin_lock(&chip->lock);
 449
 450        switch (cmd) {
 451        case SNDRV_PCM_TRIGGER_START:
 452                err = cx23885_start_audio_dma(chip);
 453                break;
 454        case SNDRV_PCM_TRIGGER_STOP:
 455                err = cx23885_stop_audio_dma(chip);
 456                break;
 457        default:
 458                err = -EINVAL;
 459                break;
 460        }
 461
 462        spin_unlock(&chip->lock);
 463
 464        return err;
 465}
 466
 467/*
 468 * pointer callback
 469 */
 470static snd_pcm_uframes_t snd_cx23885_pointer(
 471        struct snd_pcm_substream *substream)
 472{
 473        struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 474        struct snd_pcm_runtime *runtime = substream->runtime;
 475        u16 count;
 476
 477        count = atomic_read(&chip->count);
 478
 479        return runtime->period_size * (count & (runtime->periods-1));
 480}
 481
 482/*
 483 * page callback (needed for mmap)
 484 */
 485static struct page *snd_cx23885_page(struct snd_pcm_substream *substream,
 486                                unsigned long offset)
 487{
 488        void *pageptr = substream->runtime->dma_area + offset;
 489        return vmalloc_to_page(pageptr);
 490}
 491
 492/*
 493 * operators
 494 */
 495static const struct snd_pcm_ops snd_cx23885_pcm_ops = {
 496        .open = snd_cx23885_pcm_open,
 497        .close = snd_cx23885_close,
 498        .ioctl = snd_pcm_lib_ioctl,
 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