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