linux/sound/arm/pxa2xx-ac97.c
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   1/*
   2 * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip.
   3 *
   4 * Author:      Nicolas Pitre
   5 * Created:     Dec 02, 2004
   6 * Copyright:   MontaVista Software Inc.
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12
  13#include <linux/init.h>
  14#include <linux/io.h>
  15#include <linux/module.h>
  16#include <linux/platform_device.h>
  17#include <linux/dmaengine.h>
  18
  19#include <sound/core.h>
  20#include <sound/pcm.h>
  21#include <sound/ac97_codec.h>
  22#include <sound/initval.h>
  23#include <sound/pxa2xx-lib.h>
  24#include <sound/dmaengine_pcm.h>
  25
  26#include <mach/regs-ac97.h>
  27#include <mach/audio.h>
  28
  29#include "pxa2xx-pcm.h"
  30
  31static void pxa2xx_ac97_reset(struct snd_ac97 *ac97)
  32{
  33        if (!pxa2xx_ac97_try_cold_reset(ac97)) {
  34                pxa2xx_ac97_try_warm_reset(ac97);
  35        }
  36
  37        pxa2xx_ac97_finish_reset(ac97);
  38}
  39
  40static struct snd_ac97_bus_ops pxa2xx_ac97_ops = {
  41        .read   = pxa2xx_ac97_read,
  42        .write  = pxa2xx_ac97_write,
  43        .reset  = pxa2xx_ac97_reset,
  44};
  45
  46static unsigned long pxa2xx_ac97_pcm_out_req = 12;
  47static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_out = {
  48        .addr           = __PREG(PCDR),
  49        .addr_width     = DMA_SLAVE_BUSWIDTH_4_BYTES,
  50        .maxburst       = 32,
  51        .filter_data    = &pxa2xx_ac97_pcm_out_req,
  52};
  53
  54static unsigned long pxa2xx_ac97_pcm_in_req = 11;
  55static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_in = {
  56        .addr           = __PREG(PCDR),
  57        .addr_width     = DMA_SLAVE_BUSWIDTH_4_BYTES,
  58        .maxburst       = 32,
  59        .filter_data    = &pxa2xx_ac97_pcm_in_req,
  60};
  61
  62static struct snd_pcm *pxa2xx_ac97_pcm;
  63static struct snd_ac97 *pxa2xx_ac97_ac97;
  64
  65static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream)
  66{
  67        struct snd_pcm_runtime *runtime = substream->runtime;
  68        pxa2xx_audio_ops_t *platform_ops;
  69        int r;
  70
  71        runtime->hw.channels_min = 2;
  72        runtime->hw.channels_max = 2;
  73
  74        r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  75            AC97_RATES_FRONT_DAC : AC97_RATES_ADC;
  76        runtime->hw.rates = pxa2xx_ac97_ac97->rates[r];
  77        snd_pcm_limit_hw_rates(runtime);
  78
  79        platform_ops = substream->pcm->card->dev->platform_data;
  80        if (platform_ops && platform_ops->startup)
  81                return platform_ops->startup(substream, platform_ops->priv);
  82        else
  83                return 0;
  84}
  85
  86static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream)
  87{
  88        pxa2xx_audio_ops_t *platform_ops;
  89
  90        platform_ops = substream->pcm->card->dev->platform_data;
  91        if (platform_ops && platform_ops->shutdown)
  92                platform_ops->shutdown(substream, platform_ops->priv);
  93}
  94
  95static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream)
  96{
  97        struct snd_pcm_runtime *runtime = substream->runtime;
  98        int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
  99                  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
 100        return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate);
 101}
 102
 103static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = {
 104        .playback_params        = &pxa2xx_ac97_pcm_out,
 105        .capture_params         = &pxa2xx_ac97_pcm_in,
 106        .startup                = pxa2xx_ac97_pcm_startup,
 107        .shutdown               = pxa2xx_ac97_pcm_shutdown,
 108        .prepare                = pxa2xx_ac97_pcm_prepare,
 109};
 110
 111#ifdef CONFIG_PM_SLEEP
 112
 113static int pxa2xx_ac97_do_suspend(struct snd_card *card)
 114{
 115        pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 116
 117        snd_power_change_state(card, SNDRV_CTL_POWER_D3cold);
 118        snd_pcm_suspend_all(pxa2xx_ac97_pcm);
 119        snd_ac97_suspend(pxa2xx_ac97_ac97);
 120        if (platform_ops && platform_ops->suspend)
 121                platform_ops->suspend(platform_ops->priv);
 122
 123        return pxa2xx_ac97_hw_suspend();
 124}
 125
 126static int pxa2xx_ac97_do_resume(struct snd_card *card)
 127{
 128        pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data;
 129        int rc;
 130
 131        rc = pxa2xx_ac97_hw_resume();
 132        if (rc)
 133                return rc;
 134
 135        if (platform_ops && platform_ops->resume)
 136                platform_ops->resume(platform_ops->priv);
 137        snd_ac97_resume(pxa2xx_ac97_ac97);
 138        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
 139
 140        return 0;
 141}
 142
 143static int pxa2xx_ac97_suspend(struct device *dev)
 144{
 145        struct snd_card *card = dev_get_drvdata(dev);
 146        int ret = 0;
 147
 148        if (card)
 149                ret = pxa2xx_ac97_do_suspend(card);
 150
 151        return ret;
 152}
 153
 154static int pxa2xx_ac97_resume(struct device *dev)
 155{
 156        struct snd_card *card = dev_get_drvdata(dev);
 157        int ret = 0;
 158
 159        if (card)
 160                ret = pxa2xx_ac97_do_resume(card);
 161
 162        return ret;
 163}
 164
 165static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume);
 166#endif
 167
 168static int pxa2xx_ac97_probe(struct platform_device *dev)
 169{
 170        struct snd_card *card;
 171        struct snd_ac97_bus *ac97_bus;
 172        struct snd_ac97_template ac97_template;
 173        int ret;
 174        pxa2xx_audio_ops_t *pdata = dev->dev.platform_data;
 175
 176        if (dev->id >= 0) {
 177                dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n");
 178                ret = -ENXIO;
 179                goto err_dev;
 180        }
 181
 182        ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1,
 183                           THIS_MODULE, 0, &card);
 184        if (ret < 0)
 185                goto err;
 186
 187        strlcpy(card->driver, dev->dev.driver->name, sizeof(card->driver));
 188
 189        ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm);
 190        if (ret)
 191                goto err;
 192
 193        ret = pxa2xx_ac97_hw_probe(dev);
 194        if (ret)
 195                goto err;
 196
 197        ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus);
 198        if (ret)
 199                goto err_remove;
 200        memset(&ac97_template, 0, sizeof(ac97_template));
 201        ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97);
 202        if (ret)
 203                goto err_remove;
 204
 205        snprintf(card->shortname, sizeof(card->shortname),
 206                 "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97));
 207        snprintf(card->longname, sizeof(card->longname),
 208                 "%s (%s)", dev->dev.driver->name, card->mixername);
 209
 210        if (pdata && pdata->codec_pdata[0])
 211                snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]);
 212        ret = snd_card_register(card);
 213        if (ret == 0) {
 214                platform_set_drvdata(dev, card);
 215                return 0;
 216        }
 217
 218err_remove:
 219        pxa2xx_ac97_hw_remove(dev);
 220err:
 221        if (card)
 222                snd_card_free(card);
 223err_dev:
 224        return ret;
 225}
 226
 227static int pxa2xx_ac97_remove(struct platform_device *dev)
 228{
 229        struct snd_card *card = platform_get_drvdata(dev);
 230
 231        if (card) {
 232                snd_card_free(card);
 233                pxa2xx_ac97_hw_remove(dev);
 234        }
 235
 236        return 0;
 237}
 238
 239static struct platform_driver pxa2xx_ac97_driver = {
 240        .probe          = pxa2xx_ac97_probe,
 241        .remove         = pxa2xx_ac97_remove,
 242        .driver         = {
 243                .name   = "pxa2xx-ac97",
 244#ifdef CONFIG_PM_SLEEP
 245                .pm     = &pxa2xx_ac97_pm_ops,
 246#endif
 247        },
 248};
 249
 250module_platform_driver(pxa2xx_ac97_driver);
 251
 252MODULE_AUTHOR("Nicolas Pitre");
 253MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip");
 254MODULE_LICENSE("GPL");
 255MODULE_ALIAS("platform:pxa2xx-ac97");
 256