LXR linux/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
  53static unsigned int disable_analog_audio;
  54module_param(disable_analog_audio, int, 0644);
  55MODULE_PARM_DESC(disable_analog_audio, "disable analog audio ALSA driver");
  56
  57static unsigned int audio_debug;
  58module_param(audio_debug, int, 0644);
  59MODULE_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
  80static 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(buf->nr_pages * sizeof(*buf->sglist));
  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
 111vmalloc_to_page_err:
 112        vfree(buf->sglist);
 113        buf->sglist = NULL;
 114vzalloc_err:
 115        vfree(buf->vaddr);
 116        buf->vaddr = NULL;
 117        return -ENOMEM;
 118}
 119
 120static 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
 134static 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
 146static 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
 159static 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 */
 212static 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 */
 235int 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
 267static 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
 295static 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 */
 319static 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 */
 357static int snd_cx23885_close(struct snd_pcm_substream *substream)
 358{
 359        return 0;
 360}
 361
 362
 363/*
 364 * hw_params callback
 365 */
 366static 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
 417error:
 418        kfree(buf);
 419        chip->buf = NULL;
 420        return ret;
 421}
 422
 423/*
 424 * hw free callback
 425 */
 426static 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 */
 442static int snd_cx23885_prepare(struct snd_pcm_substream *substream)
 443{
 444        return 0;
 445}
 446
 447/*
 448 * trigger callback
 449 */
 450static 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 */
 479static 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 */
 494static 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 */
 504static 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 */
 519static 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
 543struct 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
 586error:
 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 */
 597void 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}
 603