Beispiel #1
0
static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params *params,
				  struct snd_soc_dai *dai)
{
	/* FIXME */
	struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
	unsigned long r, stat;
	int chans, stype = SUBSTREAM_TYPE(substream);

	chans = params_channels(params);

	r = au_readl(AC97_CFG(pscdata));
	stat = au_readl(AC97_STAT(pscdata));

	/* already active? */
	if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) {
		/* reject parameters not currently set up */
		if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) ||
		    (pscdata->rate != params_rate(params)))
			return -EINVAL;
	} else {
		/* disable AC97 device controller first */
		au_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
		au_sync();

		/* set sample bitdepth: REG[24:21]=(BITS-2)/2 */
		r &= ~PSC_AC97CFG_LEN_MASK;
		r |= PSC_AC97CFG_SET_LEN(params->msbits);

		/* channels: enable slots for front L/R channel */
		if (stype == PCM_TX) {
			r &= ~PSC_AC97CFG_TXSLOT_MASK;
			r |= PSC_AC97CFG_TXSLOT_ENA(3);
			r |= PSC_AC97CFG_TXSLOT_ENA(4);
		} else {
			r &= ~PSC_AC97CFG_RXSLOT_MASK;
			r |= PSC_AC97CFG_RXSLOT_ENA(3);
			r |= PSC_AC97CFG_RXSLOT_ENA(4);
		}

		/* finally enable the AC97 controller again */
		au_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
		au_sync();

		pscdata->cfg = r;
		pscdata->rate = params_rate(params);
	}

	return 0;
}
Beispiel #2
0
static int au1xpsc_ac97_hw_params(struct snd_pcm_substream *substream,
				  struct snd_pcm_hw_params *params,
				  struct snd_soc_dai *dai)
{
	
	struct au1xpsc_audio_data *pscdata = au1xpsc_ac97_workdata;
	unsigned long r, ro, stat;
	int chans, stype = SUBSTREAM_TYPE(substream);

	chans = params_channels(params);

	r = ro = au_readl(AC97_CFG(pscdata));
	stat = au_readl(AC97_STAT(pscdata));

	
	if (stat & (PSC_AC97STAT_TB | PSC_AC97STAT_RB)) {
		
		if ((PSC_AC97CFG_GET_LEN(r) != params->msbits) ||
		    (pscdata->rate != params_rate(params)))
			return -EINVAL;
	} else {

		
		r &= ~PSC_AC97CFG_LEN_MASK;
		r |= PSC_AC97CFG_SET_LEN(params->msbits);

		
		if (stype == PCM_TX) {
			r &= ~PSC_AC97CFG_TXSLOT_MASK;
			r |= PSC_AC97CFG_TXSLOT_ENA(3);
			r |= PSC_AC97CFG_TXSLOT_ENA(4);
		} else {
			r &= ~PSC_AC97CFG_RXSLOT_MASK;
			r |= PSC_AC97CFG_RXSLOT_ENA(3);
			r |= PSC_AC97CFG_RXSLOT_ENA(4);
		}

		
		if (!(r ^ ro))
			goto out;

		
		mutex_lock(&pscdata->lock);

		
		au_writel(r & ~PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
		au_sync();

		
		while (au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR)
			asm volatile ("nop");

		
		au_writel(r, AC97_CFG(pscdata));
		au_sync();

		
		au_writel(r | PSC_AC97CFG_DE_ENABLE, AC97_CFG(pscdata));
		au_sync();

		
		while (!(au_readl(AC97_STAT(pscdata)) & PSC_AC97STAT_DR))
			asm volatile ("nop");

		mutex_unlock(&pscdata->lock);

		pscdata->cfg = r;
		pscdata->rate = params_rate(params);
	}

out:
	return 0;
}