diff options
Diffstat (limited to 'kernel/sound/arm/pxa2xx-ac97.c')
| -rw-r--r-- | kernel/sound/arm/pxa2xx-ac97.c | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/kernel/sound/arm/pxa2xx-ac97.c b/kernel/sound/arm/pxa2xx-ac97.c new file mode 100644 index 000000000..38590b322 --- /dev/null +++ b/kernel/sound/arm/pxa2xx-ac97.c @@ -0,0 +1,255 @@ +/* + * linux/sound/pxa2xx-ac97.c -- AC97 support for the Intel PXA2xx chip. + * + * Author: Nicolas Pitre + * Created: Dec 02, 2004 + * Copyright: MontaVista Software Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/dmaengine.h> + +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/ac97_codec.h> +#include <sound/initval.h> +#include <sound/pxa2xx-lib.h> +#include <sound/dmaengine_pcm.h> + +#include <mach/regs-ac97.h> +#include <mach/audio.h> + +#include "pxa2xx-pcm.h" + +static void pxa2xx_ac97_reset(struct snd_ac97 *ac97) +{ + if (!pxa2xx_ac97_try_cold_reset(ac97)) { + pxa2xx_ac97_try_warm_reset(ac97); + } + + pxa2xx_ac97_finish_reset(ac97); +} + +static struct snd_ac97_bus_ops pxa2xx_ac97_ops = { + .read = pxa2xx_ac97_read, + .write = pxa2xx_ac97_write, + .reset = pxa2xx_ac97_reset, +}; + +static unsigned long pxa2xx_ac97_pcm_out_req = 12; +static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_out = { + .addr = __PREG(PCDR), + .addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, + .maxburst = 32, + .filter_data = &pxa2xx_ac97_pcm_out_req, +}; + +static unsigned long pxa2xx_ac97_pcm_in_req = 11; +static struct snd_dmaengine_dai_dma_data pxa2xx_ac97_pcm_in = { + .addr = __PREG(PCDR), + .addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES, + .maxburst = 32, + .filter_data = &pxa2xx_ac97_pcm_in_req, +}; + +static struct snd_pcm *pxa2xx_ac97_pcm; +static struct snd_ac97 *pxa2xx_ac97_ac97; + +static int pxa2xx_ac97_pcm_startup(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + pxa2xx_audio_ops_t *platform_ops; + int r; + + runtime->hw.channels_min = 2; + runtime->hw.channels_max = 2; + + r = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? + AC97_RATES_FRONT_DAC : AC97_RATES_ADC; + runtime->hw.rates = pxa2xx_ac97_ac97->rates[r]; + snd_pcm_limit_hw_rates(runtime); + + platform_ops = substream->pcm->card->dev->platform_data; + if (platform_ops && platform_ops->startup) + return platform_ops->startup(substream, platform_ops->priv); + else + return 0; +} + +static void pxa2xx_ac97_pcm_shutdown(struct snd_pcm_substream *substream) +{ + pxa2xx_audio_ops_t *platform_ops; + + platform_ops = substream->pcm->card->dev->platform_data; + if (platform_ops && platform_ops->shutdown) + platform_ops->shutdown(substream, platform_ops->priv); +} + +static int pxa2xx_ac97_pcm_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ? + AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE; + return snd_ac97_set_rate(pxa2xx_ac97_ac97, reg, runtime->rate); +} + +static struct pxa2xx_pcm_client pxa2xx_ac97_pcm_client = { + .playback_params = &pxa2xx_ac97_pcm_out, + .capture_params = &pxa2xx_ac97_pcm_in, + .startup = pxa2xx_ac97_pcm_startup, + .shutdown = pxa2xx_ac97_pcm_shutdown, + .prepare = pxa2xx_ac97_pcm_prepare, +}; + +#ifdef CONFIG_PM_SLEEP + +static int pxa2xx_ac97_do_suspend(struct snd_card *card) +{ + pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data; + + snd_power_change_state(card, SNDRV_CTL_POWER_D3cold); + snd_pcm_suspend_all(pxa2xx_ac97_pcm); + snd_ac97_suspend(pxa2xx_ac97_ac97); + if (platform_ops && platform_ops->suspend) + platform_ops->suspend(platform_ops->priv); + + return pxa2xx_ac97_hw_suspend(); +} + +static int pxa2xx_ac97_do_resume(struct snd_card *card) +{ + pxa2xx_audio_ops_t *platform_ops = card->dev->platform_data; + int rc; + + rc = pxa2xx_ac97_hw_resume(); + if (rc) + return rc; + + if (platform_ops && platform_ops->resume) + platform_ops->resume(platform_ops->priv); + snd_ac97_resume(pxa2xx_ac97_ac97); + snd_power_change_state(card, SNDRV_CTL_POWER_D0); + + return 0; +} + +static int pxa2xx_ac97_suspend(struct device *dev) +{ + struct snd_card *card = dev_get_drvdata(dev); + int ret = 0; + + if (card) + ret = pxa2xx_ac97_do_suspend(card); + + return ret; +} + +static int pxa2xx_ac97_resume(struct device *dev) +{ + struct snd_card *card = dev_get_drvdata(dev); + int ret = 0; + + if (card) + ret = pxa2xx_ac97_do_resume(card); + + return ret; +} + +static SIMPLE_DEV_PM_OPS(pxa2xx_ac97_pm_ops, pxa2xx_ac97_suspend, pxa2xx_ac97_resume); +#endif + +static int pxa2xx_ac97_probe(struct platform_device *dev) +{ + struct snd_card *card; + struct snd_ac97_bus *ac97_bus; + struct snd_ac97_template ac97_template; + int ret; + pxa2xx_audio_ops_t *pdata = dev->dev.platform_data; + + if (dev->id >= 0) { + dev_err(&dev->dev, "PXA2xx has only one AC97 port.\n"); + ret = -ENXIO; + goto err_dev; + } + + ret = snd_card_new(&dev->dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, + THIS_MODULE, 0, &card); + if (ret < 0) + goto err; + + strlcpy(card->driver, dev->dev.driver->name, sizeof(card->driver)); + + ret = pxa2xx_pcm_new(card, &pxa2xx_ac97_pcm_client, &pxa2xx_ac97_pcm); + if (ret) + goto err; + + ret = pxa2xx_ac97_hw_probe(dev); + if (ret) + goto err; + + ret = snd_ac97_bus(card, 0, &pxa2xx_ac97_ops, NULL, &ac97_bus); + if (ret) + goto err_remove; + memset(&ac97_template, 0, sizeof(ac97_template)); + ret = snd_ac97_mixer(ac97_bus, &ac97_template, &pxa2xx_ac97_ac97); + if (ret) + goto err_remove; + + snprintf(card->shortname, sizeof(card->shortname), + "%s", snd_ac97_get_short_name(pxa2xx_ac97_ac97)); + snprintf(card->longname, sizeof(card->longname), + "%s (%s)", dev->dev.driver->name, card->mixername); + + if (pdata && pdata->codec_pdata[0]) + snd_ac97_dev_add_pdata(ac97_bus->codec[0], pdata->codec_pdata[0]); + ret = snd_card_register(card); + if (ret == 0) { + platform_set_drvdata(dev, card); + return 0; + } + +err_remove: + pxa2xx_ac97_hw_remove(dev); +err: + if (card) + snd_card_free(card); +err_dev: + return ret; +} + +static int pxa2xx_ac97_remove(struct platform_device *dev) +{ + struct snd_card *card = platform_get_drvdata(dev); + + if (card) { + snd_card_free(card); + pxa2xx_ac97_hw_remove(dev); + } + + return 0; +} + +static struct platform_driver pxa2xx_ac97_driver = { + .probe = pxa2xx_ac97_probe, + .remove = pxa2xx_ac97_remove, + .driver = { + .name = "pxa2xx-ac97", +#ifdef CONFIG_PM_SLEEP + .pm = &pxa2xx_ac97_pm_ops, +#endif + }, +}; + +module_platform_driver(pxa2xx_ac97_driver); + +MODULE_AUTHOR("Nicolas Pitre"); +MODULE_DESCRIPTION("AC97 driver for the Intel PXA2xx chip"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:pxa2xx-ac97"); |