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

   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
  44 static unsigned int disable_analog_audio;
  45 module_param(disable_analog_audio, int, 0644);
  46 MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver");
  47
  48 static unsigned int audio_debug;
  49 module_param(audio_debug, int, 0644);
  50 MODULE_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
  71 static 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
 102 vmalloc_to_page_err:
 103         vfree(buf->sglist);
 104         buf->sglist = NULL;
 105 vzalloc_err:
 106         vfree(buf->vaddr);
 107         buf->vaddr = NULL;
 108         return -ENOMEM;
 109 }
 110
 111 static 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
 125 static 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
 137 static 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
 150 static 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  */
 203 static 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  */
 226 int 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
 258 static 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
 286 static 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  */
 310 static 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  */
 348 static int snd_cx23885_close(struct snd_pcm_substream *substream)
 349 {
 350         return 0;
 351 }
 352
 353
 354 /*
 355  * hw_params callback
 356  */
 357 static 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
 408 error:
 409         kfree(buf);
 410         chip->buf = NULL;
 411         return ret;
 412 }
 413
 414 /*
 415  * hw free callback
 416  */
 417 static 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  */
 433 static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
 434 {
 435         return 0;
 436 }
 437
 438 /*
 439  * trigger callback
 440  */
 441 static 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  */
 470 static 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  */
 485 static 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  */
 495 static const struct snd_pcm_ops snd_cx23885_pcm_ops = {
 496         .open = snd_cx23885_pcm_open,
 497         .close = snd_cx23885_close,
 498         .hw_params = snd_cx23885_hw_params,
 499         .hw_free = snd_cx23885_hw_free,
 500         .prepare = snd_cx23885_prepare,
 501         .trigger = snd_cx23885_card_trigger,
 502         .pointer = snd_cx23885_pointer,
 503         .page = snd_cx23885_page,
 504 };
 505
 506 /*
 507  * create a PCM device
 508  */
 509 static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device,
 510         char *name)
 511 {
 512         int err;
 513         struct snd_pcm *pcm;
 514
 515         err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
 516         if (err < 0)
 517                 return err;
 518         pcm->private_data = chip;
 519         strscpy(pcm->name, name, sizeof(pcm->name));
 520         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops);
 521
 522         return 0;
 523 }
 524
 525 /****************************************************************************
 526                         Basic Flow for Sound Devices
 527  ****************************************************************************/
 528
 529 /*
 530  * Alsa Constructor - Component probe
 531  */
 532
 533 struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev)
 534 {
 535         struct snd_card *card;
 536         struct cx23885_audio_dev *chip;
 537         int err;
 538
 539         if (disable_analog_audio)
 540                 return NULL;
 541
 542         if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) {
 543                 pr_warn("%s(): Missing SRAM channel configuration for analog TV Audio\n",
 544                        __func__);
 545                 return NULL;
 546         }
 547
 548         err = snd_card_new(&dev->pci->dev,
 549                            SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 550                         THIS_MODULE, sizeof(struct cx23885_audio_dev), &card);
 551         if (err < 0)
 552                 goto error;
 553
 554         chip = (struct cx23885_audio_dev *) card->private_data;
 555         chip->dev = dev;
 556         chip->pci = dev->pci;
 557         chip->card = card;
 558         spin_lock_init(&chip->lock);
 559
 560         err = snd_cx23885_pcm(chip, 0, "CX23885 Digital");
 561         if (err < 0)
 562                 goto error;
 563
 564         strscpy(card->driver, "CX23885", sizeof(card->driver));
 565         sprintf(card->shortname, "Conexant CX23885");
 566         sprintf(card->longname, "%s at %s", card->shortname, dev->name);
 567
 568         err = snd_card_register(card);
 569         if (err < 0)
 570                 goto error;
 571
 572         dprintk(0, "registered ALSA audio device\n");
 573
 574         return chip;
 575
 576 error:
 577         snd_card_free(card);
 578         pr_err("%s(): Failed to register analog audio adapter\n",
 579                __func__);
 580
 581         return NULL;
 582 }
 583
 584 /*
 585  * ALSA destructor
 586  */
 587 void cx23885_audio_unregister(struct cx23885_dev *dev)
 588 {
 589         struct cx23885_audio_dev *chip = dev->audio_dev;
 590
 591         snd_card_free(chip->card);
 592 }