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 0x%08lx, size=%d\n",
  93                                 (unsigned long)buf->vaddr,
  94                                 nr_pages << PAGE_SHIFT);
  95
  96         memset(buf->vaddr, 0, nr_pages << PAGE_SHIFT);
  97         buf->nr_pages = nr_pages;
  98
  99         buf->sglist = vzalloc(buf->nr_pages * sizeof(*buf->sglist));
 100         if (NULL == buf->sglist)
 101                 goto vzalloc_err;
 102
 103         sg_init_table(buf->sglist, buf->nr_pages);
 104         for (i = 0; i < buf->nr_pages; i++) {
 105                 pg = vmalloc_to_page(buf->vaddr + i * PAGE_SIZE);
 106                 if (NULL == pg)
 107                         goto vmalloc_to_page_err;
 108                 sg_set_page(&buf->sglist[i], pg, PAGE_SIZE, 0);
 109         }
 110         return 0;
 111
 112 vmalloc_to_page_err:
 113         vfree(buf->sglist);
 114         buf->sglist = NULL;
 115 vzalloc_err:
 116         vfree(buf->vaddr);
 117         buf->vaddr = NULL;
 118         return -ENOMEM;
 119 }
 120
 121 static int cx23885_alsa_dma_map(struct cx23885_audio_dev *dev)
 122 {
 123         struct cx23885_audio_buffer *buf = dev->buf;
 124
 125         buf->sglen = dma_map_sg(&dev->pci->dev, buf->sglist,
 126                         buf->nr_pages, PCI_DMA_FROMDEVICE);
 127
 128         if (0 == buf->sglen) {
 129                 pr_warn("%s: cx23885_alsa_map_sg failed\n", __func__);
 130                 return -ENOMEM;
 131         }
 132         return 0;
 133 }
 134
 135 static int cx23885_alsa_dma_unmap(struct cx23885_audio_dev *dev)
 136 {
 137         struct cx23885_audio_buffer *buf = dev->buf;
 138
 139         if (!buf->sglen)
 140                 return 0;
 141
 142         dma_unmap_sg(&dev->pci->dev, buf->sglist, buf->sglen, PCI_DMA_FROMDEVICE);
 143         buf->sglen = 0;
 144         return 0;
 145 }
 146
 147 static int cx23885_alsa_dma_free(struct cx23885_audio_buffer *buf)
 148 {
 149         vfree(buf->sglist);
 150         buf->sglist = NULL;
 151         vfree(buf->vaddr);
 152         buf->vaddr = NULL;
 153         return 0;
 154 }
 155
 156 /*
 157  * BOARD Specific: Sets audio DMA
 158  */
 159
 160 static int cx23885_start_audio_dma(struct cx23885_audio_dev *chip)
 161 {
 162         struct cx23885_audio_buffer *buf = chip->buf;
 163         struct cx23885_dev *dev  = chip->dev;
 164         struct sram_channel *audio_ch =
 165                 &dev->sram_channels[AUDIO_SRAM_CHANNEL];
 166
 167         dprintk(1, "%s()\n", __func__);
 168
 169         /* Make sure RISC/FIFO are off before changing FIFO/RISC settings */
 170         cx_clear(AUD_INT_DMA_CTL, 0x11);
 171
 172         /* setup fifo + format - out channel */
 173         cx23885_sram_channel_setup(chip->dev, audio_ch, buf->bpl,
 174                 buf->risc.dma);
 175
 176         /* sets bpl size */
 177         cx_write(AUD_INT_A_LNGTH, buf->bpl);
 178
 179         /* This is required to get good audio (1 seems to be ok) */
 180         cx_write(AUD_INT_A_MODE, 1);
 181
 182         /* reset counter */
 183         cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 184         atomic_set(&chip->count, 0);
 185
 186         dprintk(1, "Start audio DMA, %d B/line, %d lines/FIFO, %d periods, %d byte buffer\n",
 187                 buf->bpl, cx_read(audio_ch->cmds_start+12)>>1,
 188                 chip->num_periods, buf->bpl * chip->num_periods);
 189
 190         /* Enables corresponding bits at AUD_INT_STAT */
 191         cx_write(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 192                                     AUD_INT_DN_RISCI1);
 193
 194         /* Clean any pending interrupt bits already set */
 195         cx_write(AUDIO_INT_INT_STAT, ~0);
 196
 197         /* enable audio irqs */
 198         cx_set(PCI_INT_MSK, chip->dev->pci_irqmask | PCI_MSK_AUD_INT);
 199
 200         /* start dma */
 201         cx_set(DEV_CNTRL2, (1<<5)); /* Enables Risc Processor */
 202         cx_set(AUD_INT_DMA_CTL, 0x11); /* audio downstream FIFO and
 203                                           RISC enable */
 204         if (audio_debug)
 205                 cx23885_sram_channel_dump(chip->dev, audio_ch);
 206
 207         return 0;
 208 }
 209
 210 /*
 211  * BOARD Specific: Resets audio DMA
 212  */
 213 static int cx23885_stop_audio_dma(struct cx23885_audio_dev *chip)
 214 {
 215         struct cx23885_dev *dev = chip->dev;
 216         dprintk(1, "Stopping audio DMA\n");
 217
 218         /* stop dma */
 219         cx_clear(AUD_INT_DMA_CTL, 0x11);
 220
 221         /* disable irqs */
 222         cx_clear(PCI_INT_MSK, PCI_MSK_AUD_INT);
 223         cx_clear(AUDIO_INT_INT_MSK, AUD_INT_OPC_ERR | AUD_INT_DN_SYNC |
 224                                     AUD_INT_DN_RISCI1);
 225
 226         if (audio_debug)
 227                 cx23885_sram_channel_dump(chip->dev,
 228                         &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 229
 230         return 0;
 231 }
 232
 233 /*
 234  * BOARD Specific: Handles audio IRQ
 235  */
 236 int cx23885_audio_irq(struct cx23885_dev *dev, u32 status, u32 mask)
 237 {
 238         struct cx23885_audio_dev *chip = dev->audio_dev;
 239
 240         if (0 == (status & mask))
 241                 return 0;
 242
 243         cx_write(AUDIO_INT_INT_STAT, status);
 244
 245         /* risc op code error */
 246         if (status & AUD_INT_OPC_ERR) {
 247                 pr_warn("%s/1: Audio risc op code error\n",
 248                         dev->name);
 249                 cx_clear(AUD_INT_DMA_CTL, 0x11);
 250                 cx23885_sram_channel_dump(dev,
 251                         &dev->sram_channels[AUDIO_SRAM_CHANNEL]);
 252         }
 253         if (status & AUD_INT_DN_SYNC) {
 254                 dprintk(1, "Downstream sync error\n");
 255                 cx_write(AUD_INT_A_GPCNT_CTL, GP_COUNT_CONTROL_RESET);
 256                 return 1;
 257         }
 258         /* risc1 downstream */
 259         if (status & AUD_INT_DN_RISCI1) {
 260                 atomic_set(&chip->count, cx_read(AUD_INT_A_GPCNT));
 261                 snd_pcm_period_elapsed(chip->substream);
 262         }
 263         /* FIXME: Any other status should deserve a special handling? */
 264
 265         return 1;
 266 }
 267
 268 static int dsp_buffer_free(struct cx23885_audio_dev *chip)
 269 {
 270         struct cx23885_riscmem *risc;
 271
 272         BUG_ON(!chip->dma_size);
 273
 274         dprintk(2, "Freeing buffer\n");
 275         cx23885_alsa_dma_unmap(chip);
 276         cx23885_alsa_dma_free(chip->buf);
 277         risc = &chip->buf->risc;
 278         pci_free_consistent(chip->pci, risc->size, risc->cpu, risc->dma);
 279         kfree(chip->buf);
 280
 281         chip->buf = NULL;
 282         chip->dma_size = 0;
 283
 284         return 0;
 285 }
 286
 287 /****************************************************************************
 288                                 ALSA PCM Interface
 289  ****************************************************************************/
 290
 291 /*
 292  * Digital hardware definition
 293  */
 294 #define DEFAULT_FIFO_SIZE       4096
 295
 296 static const struct snd_pcm_hardware snd_cx23885_digital_hw = {
 297         .info = SNDRV_PCM_INFO_MMAP |
 298                 SNDRV_PCM_INFO_INTERLEAVED |
 299                 SNDRV_PCM_INFO_BLOCK_TRANSFER |
 300                 SNDRV_PCM_INFO_MMAP_VALID,
 301         .formats = SNDRV_PCM_FMTBIT_S16_LE,
 302
 303         .rates =                SNDRV_PCM_RATE_48000,
 304         .rate_min =             48000,
 305         .rate_max =             48000,
 306         .channels_min = 2,
 307         .channels_max = 2,
 308         /* Analog audio output will be full of clicks and pops if there
 309            are not exactly four lines in the SRAM FIFO buffer.  */
 310         .period_bytes_min = DEFAULT_FIFO_SIZE/4,
 311         .period_bytes_max = DEFAULT_FIFO_SIZE/4,
 312         .periods_min = 1,
 313         .periods_max = 1024,
 314         .buffer_bytes_max = (1024*1024),
 315 };
 316
 317 /*
 318  * audio pcm capture open callback
 319  */
 320 static int snd_cx23885_pcm_open(struct snd_pcm_substream *substream)
 321 {
 322         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 323         struct snd_pcm_runtime *runtime = substream->runtime;
 324         int err;
 325
 326         if (!chip) {
 327                 pr_err("BUG: cx23885 can't find device struct. Can't proceed with open\n");
 328                 return -ENODEV;
 329         }
 330
 331         err = snd_pcm_hw_constraint_pow2(runtime, 0,
 332                 SNDRV_PCM_HW_PARAM_PERIODS);
 333         if (err < 0)
 334                 goto _error;
 335
 336         chip->substream = substream;
 337
 338         runtime->hw = snd_cx23885_digital_hw;
 339
 340         if (chip->dev->sram_channels[AUDIO_SRAM_CHANNEL].fifo_size !=
 341                 DEFAULT_FIFO_SIZE) {
 342                 unsigned int bpl = chip->dev->
 343                         sram_channels[AUDIO_SRAM_CHANNEL].fifo_size / 4;
 344                 bpl &= ~7; /* must be multiple of 8 */
 345                 runtime->hw.period_bytes_min = bpl;
 346                 runtime->hw.period_bytes_max = bpl;
 347         }
 348
 349         return 0;
 350 _error:
 351         dprintk(1, "Error opening PCM!\n");
 352         return err;
 353 }
 354
 355 /*
 356  * audio close callback
 357  */
 358 static int snd_cx23885_close(struct snd_pcm_substream *substream)
 359 {
 360         return 0;
 361 }
 362
 363
 364 /*
 365  * hw_params callback
 366  */
 367 static int snd_cx23885_hw_params(struct snd_pcm_substream *substream,
 368                               struct snd_pcm_hw_params *hw_params)
 369 {
 370         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 371         struct cx23885_audio_buffer *buf;
 372         int ret;
 373
 374         if (substream->runtime->dma_area) {
 375                 dsp_buffer_free(chip);
 376                 substream->runtime->dma_area = NULL;
 377         }
 378
 379         chip->period_size = params_period_bytes(hw_params);
 380         chip->num_periods = params_periods(hw_params);
 381         chip->dma_size = chip->period_size * params_periods(hw_params);
 382
 383         BUG_ON(!chip->dma_size);
 384         BUG_ON(chip->num_periods & (chip->num_periods-1));
 385
 386         buf = kzalloc(sizeof(*buf), GFP_KERNEL);
 387         if (NULL == buf)
 388                 return -ENOMEM;
 389
 390         buf->bpl = chip->period_size;
 391         chip->buf = buf;
 392
 393         ret = cx23885_alsa_dma_init(chip,
 394                         (PAGE_ALIGN(chip->dma_size) >> PAGE_SHIFT));
 395         if (ret < 0)
 396                 goto error;
 397
 398         ret = cx23885_alsa_dma_map(chip);
 399         if (ret < 0)
 400                 goto error;
 401
 402         ret = cx23885_risc_databuffer(chip->pci, &buf->risc, buf->sglist,
 403                                    chip->period_size, chip->num_periods, 1);
 404         if (ret < 0)
 405                 goto error;
 406
 407         /* Loop back to start of program */
 408         buf->risc.jmp[0] = cpu_to_le32(RISC_JUMP|RISC_IRQ1|RISC_CNT_INC);
 409         buf->risc.jmp[1] = cpu_to_le32(buf->risc.dma);
 410         buf->risc.jmp[2] = cpu_to_le32(0); /* bits 63-32 */
 411
 412         substream->runtime->dma_area = chip->buf->vaddr;
 413         substream->runtime->dma_bytes = chip->dma_size;
 414         substream->runtime->dma_addr = 0;
 415
 416         return 0;
 417
 418 error:
 419         kfree(buf);
 420         chip->buf = NULL;
 421         return ret;
 422 }
 423
 424 /*
 425  * hw free callback
 426  */
 427 static int snd_cx23885_hw_free(struct snd_pcm_substream *substream)
 428 {
 429
 430         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 431
 432         if (substream->runtime->dma_area) {
 433                 dsp_buffer_free(chip);
 434                 substream->runtime->dma_area = NULL;
 435         }
 436
 437         return 0;
 438 }
 439
 440 /*
 441  * prepare callback
 442  */
 443 static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
 444 {
 445         return 0;
 446 }
 447
 448 /*
 449  * trigger callback
 450  */
 451 static int snd_cx23885_card_trigger(struct snd_pcm_substream *substream,
 452         int cmd)
 453 {
 454         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 455         int err;
 456
 457         /* Local interrupts are already disabled by ALSA */
 458         spin_lock(&chip->lock);
 459
 460         switch (cmd) {
 461         case SNDRV_PCM_TRIGGER_START:
 462                 err = cx23885_start_audio_dma(chip);
 463                 break;
 464         case SNDRV_PCM_TRIGGER_STOP:
 465                 err = cx23885_stop_audio_dma(chip);
 466                 break;
 467         default:
 468                 err = -EINVAL;
 469                 break;
 470         }
 471
 472         spin_unlock(&chip->lock);
 473
 474         return err;
 475 }
 476
 477 /*
 478  * pointer callback
 479  */
 480 static snd_pcm_uframes_t snd_cx23885_pointer(
 481         struct snd_pcm_substream *substream)
 482 {
 483         struct cx23885_audio_dev *chip = snd_pcm_substream_chip(substream);
 484         struct snd_pcm_runtime *runtime = substream->runtime;
 485         u16 count;
 486
 487         count = atomic_read(&chip->count);
 488
 489         return runtime->period_size * (count & (runtime->periods-1));
 490 }
 491
 492 /*
 493  * page callback (needed for mmap)
 494  */
 495 static struct page *snd_cx23885_page(struct snd_pcm_substream *substream,
 496                                 unsigned long offset)
 497 {
 498         void *pageptr = substream->runtime->dma_area + offset;
 499         return vmalloc_to_page(pageptr);
 500 }
 501
 502 /*
 503  * operators
 504  */
 505 static const struct snd_pcm_ops snd_cx23885_pcm_ops = {
 506         .open = snd_cx23885_pcm_open,
 507         .close = snd_cx23885_close,
 508         .ioctl = snd_pcm_lib_ioctl,
 509         .hw_params = snd_cx23885_hw_params,
 510         .hw_free = snd_cx23885_hw_free,
 511         .prepare = snd_cx23885_prepare,
 512         .trigger = snd_cx23885_card_trigger,
 513         .pointer = snd_cx23885_pointer,
 514         .page = snd_cx23885_page,
 515 };
 516
 517 /*
 518  * create a PCM device
 519  */
 520 static int snd_cx23885_pcm(struct cx23885_audio_dev *chip, int device,
 521         char *name)
 522 {
 523         int err;
 524         struct snd_pcm *pcm;
 525
 526         err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
 527         if (err < 0)
 528                 return err;
 529         pcm->private_data = chip;
 530         strcpy(pcm->name, name);
 531         snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_cx23885_pcm_ops);
 532
 533         return 0;
 534 }
 535
 536 /****************************************************************************
 537                         Basic Flow for Sound Devices
 538  ****************************************************************************/
 539
 540 /*
 541  * Alsa Constructor - Component probe
 542  */
 543
 544 struct cx23885_audio_dev *cx23885_audio_register(struct cx23885_dev *dev)
 545 {
 546         struct snd_card *card;
 547         struct cx23885_audio_dev *chip;
 548         int err;
 549
 550         if (disable_analog_audio)
 551                 return NULL;
 552
 553         if (dev->sram_channels[AUDIO_SRAM_CHANNEL].cmds_start == 0) {
 554                 pr_warn("%s(): Missing SRAM channel configuration for analog TV Audio\n",
 555                        __func__);
 556                 return NULL;
 557         }
 558
 559         err = snd_card_new(&dev->pci->dev,
 560                            SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 561                         THIS_MODULE, sizeof(struct cx23885_audio_dev), &card);
 562         if (err < 0)
 563                 goto error;
 564
 565         chip = (struct cx23885_audio_dev *) card->private_data;
 566         chip->dev = dev;
 567         chip->pci = dev->pci;
 568         chip->card = card;
 569         spin_lock_init(&chip->lock);
 570
 571         err = snd_cx23885_pcm(chip, 0, "CX23885 Digital");
 572         if (err < 0)
 573                 goto error;
 574
 575         strcpy(card->driver, "CX23885");
 576         sprintf(card->shortname, "Conexant CX23885");
 577         sprintf(card->longname, "%s at %s", card->shortname, dev->name);
 578
 579         err = snd_card_register(card);
 580         if (err < 0)
 581                 goto error;
 582
 583         dprintk(0, "registered ALSA audio device\n");
 584
 585         return chip;
 586
 587 error:
 588         snd_card_free(card);
 589         pr_err("%s(): Failed to register analog audio adapter\n",
 590                __func__);
 591
 592         return NULL;
 593 }
 594
 595 /*
 596  * ALSA destructor
 597  */
 598 void cx23885_audio_unregister(struct cx23885_dev *dev)
 599 {
 600         struct cx23885_audio_dev *chip = dev->audio_dev;
 601
 602         snd_card_free(chip->card);
 603 }