au1x00.c

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	struct audio_stream *stream = substream->private_data;
	au1000_release_dma_link(stream);
	return snd_pcm_lib_free_pages(substream);
}

static int
snd_au1000_playback_prepare(struct snd_pcm_substream *substream)
{
	struct snd_au1000 *au1000 = substream->pcm->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;

	if (runtime->channels == 1)
		au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_4);
	else
		au1000_set_ac97_xmit_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
	snd_ac97_set_rate(au1000->ac97, AC97_PCM_FRONT_DAC_RATE, runtime->rate);
	return 0;
}

static int
snd_au1000_capture_prepare(struct snd_pcm_substream *substream)
{
	struct snd_au1000 *au1000 = substream->pcm->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;

	if (runtime->channels == 1)
		au1000_set_ac97_recv_slots(au1000, AC97_SLOT_4);
	else
		au1000_set_ac97_recv_slots(au1000, AC97_SLOT_3 | AC97_SLOT_4);
	snd_ac97_set_rate(au1000->ac97, AC97_PCM_LR_ADC_RATE, runtime->rate);
	return 0;
}

static int
snd_au1000_trigger(struct snd_pcm_substream *substream, int cmd)
{
	struct audio_stream *stream = substream->private_data;
	int err = 0;

	spin_lock(&stream->dma_lock);
	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		au1000_dma_start(stream);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
		au1000_dma_stop(stream);
		break;
	default:
		err = -EINVAL;
		break;
	}
	spin_unlock(&stream->dma_lock);
	return err;
}

static snd_pcm_uframes_t
snd_au1000_pointer(struct snd_pcm_substream *substream)
{
	struct audio_stream *stream = substream->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	long location;

	spin_lock(&stream->dma_lock);
	location = get_dma_residue(stream->dma);
	spin_unlock(&stream->dma_lock);
	location = stream->buffer->relative_end - location;
	if (location == -1)
		location = 0;
	return bytes_to_frames(runtime,location);
}

static struct snd_pcm_ops snd_card_au1000_playback_ops = {
	.open			= snd_au1000_playback_open,
	.close			= snd_au1000_playback_close,
	.ioctl			= snd_pcm_lib_ioctl,
	.hw_params	        = snd_au1000_hw_params,
	.hw_free	        = snd_au1000_hw_free,
	.prepare		= snd_au1000_playback_prepare,
	.trigger		= snd_au1000_trigger,
	.pointer		= snd_au1000_pointer,
};

static struct snd_pcm_ops snd_card_au1000_capture_ops = {
	.open			= snd_au1000_capture_open,
	.close			= snd_au1000_capture_close,
	.ioctl			= snd_pcm_lib_ioctl,
	.hw_params	        = snd_au1000_hw_params,
	.hw_free	        = snd_au1000_hw_free,
	.prepare		= snd_au1000_capture_prepare,
	.trigger		= snd_au1000_trigger,
	.pointer		= snd_au1000_pointer,
};

static int __devinit
snd_au1000_pcm_new(struct snd_au1000 *au1000)
{
	struct snd_pcm *pcm;
	int err;
	unsigned long flags;

	if ((err = snd_pcm_new(au1000->card, "AU1000 AC97 PCM", 0, 1, 1, &pcm)) < 0)
		return err;

	snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
		snd_dma_continuous_data(GFP_KERNEL), 128*1024, 128*1024);

	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
		&snd_card_au1000_playback_ops);
	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
		&snd_card_au1000_capture_ops);

	pcm->private_data = au1000;
	pcm->info_flags = 0;
	strcpy(pcm->name, "Au1000 AC97 PCM");

	spin_lock_init(&au1000->stream[PLAYBACK]->dma_lock);
	spin_lock_init(&au1000->stream[CAPTURE]->dma_lock);

	flags = claim_dma_lock();
	if ((au1000->stream[PLAYBACK]->dma = request_au1000_dma(DMA_ID_AC97C_TX,
			"AC97 TX", au1000_dma_interrupt, IRQF_DISABLED,
			au1000->stream[PLAYBACK])) < 0) {
		release_dma_lock(flags);
		return -EBUSY;
	}
	if ((au1000->stream[CAPTURE]->dma = request_au1000_dma(DMA_ID_AC97C_RX,
			"AC97 RX", au1000_dma_interrupt, IRQF_DISABLED,
			au1000->stream[CAPTURE])) < 0){
		release_dma_lock(flags);
		return -EBUSY;
	}
	/* enable DMA coherency in read/write DMA channels */
	set_dma_mode(au1000->stream[PLAYBACK]->dma,
		     get_dma_mode(au1000->stream[PLAYBACK]->dma) & ~DMA_NC);
	set_dma_mode(au1000->stream[CAPTURE]->dma,
		     get_dma_mode(au1000->stream[CAPTURE]->dma) & ~DMA_NC);
	release_dma_lock(flags);
	au1000->pcm = pcm;
	return 0;
}


/*-------------------------- AC97 CODEC Control ------------------------------*/

static unsigned short
snd_au1000_ac97_read(struct snd_ac97 *ac97, unsigned short reg)
{
	struct snd_au1000 *au1000 = ac97->private_data;
	u32 volatile cmd;
	u16 volatile data;
	int             i;

	spin_lock(&au1000->ac97_lock);
/* would rather use the interrupt than this polling but it works and I can't
get the interrupt driven case to work efficiently */
	for (i = 0; i < 0x5000; i++)
		if (!(au1000->ac97_ioport->status & AC97C_CP))
			break;
	if (i == 0x5000)
		printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");

	cmd = (u32) reg & AC97C_INDEX_MASK;
	cmd |= AC97C_READ;
	au1000->ac97_ioport->cmd = cmd;

	/* now wait for the data */
	for (i = 0; i < 0x5000; i++)
		if (!(au1000->ac97_ioport->status & AC97C_CP))
			break;
	if (i == 0x5000) {
		printk(KERN_ERR "au1000 AC97: AC97 command read timeout\n");
		return 0;
	}

	data = au1000->ac97_ioport->cmd & 0xffff;
	spin_unlock(&au1000->ac97_lock);

	return data;

}


static void
snd_au1000_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val)
{
	struct snd_au1000 *au1000 = ac97->private_data;
	u32 cmd;
	int i;

	spin_lock(&au1000->ac97_lock);
/* would rather use the interrupt than this polling but it works and I can't
get the interrupt driven case to work efficiently */
	for (i = 0; i < 0x5000; i++)
		if (!(au1000->ac97_ioport->status & AC97C_CP))
			break;
	if (i == 0x5000)
		printk(KERN_ERR "au1000 AC97: AC97 command write timeout\n");

	cmd = (u32) reg & AC97C_INDEX_MASK;
	cmd &= ~AC97C_READ;
	cmd |= ((u32) val << AC97C_WD_BIT);
	au1000->ac97_ioport->cmd = cmd;
	spin_unlock(&au1000->ac97_lock);
}

static int __devinit
snd_au1000_ac97_new(struct snd_au1000 *au1000)
{
	int err;
	struct snd_ac97_bus *pbus;
	struct snd_ac97_template ac97;
 	static struct snd_ac97_bus_ops ops = {
		.write = snd_au1000_ac97_write,
		.read = snd_au1000_ac97_read,
	};

	if ((au1000->ac97_res_port = request_mem_region(CPHYSADDR(AC97C_CONFIG),
	       		0x100000, "Au1x00 AC97")) == NULL) {
		snd_printk(KERN_ERR "ALSA AC97: can't grap AC97 port\n");
		return -EBUSY;
	}
	au1000->ac97_ioport = (struct au1000_ac97_reg *)
		KSEG1ADDR(au1000->ac97_res_port->start);

	spin_lock_init(&au1000->ac97_lock);

	/* configure pins for AC'97
	TODO: move to board_setup.c */
	au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC);

	/* Initialise Au1000's AC'97 Control Block */
	au1000->ac97_ioport->cntrl = AC97C_RS | AC97C_CE;
	udelay(10);
	au1000->ac97_ioport->cntrl = AC97C_CE;
	udelay(10);

	/* Initialise External CODEC -- cold reset */
	au1000->ac97_ioport->config = AC97C_RESET;
	udelay(10);
	au1000->ac97_ioport->config = 0x0;
	mdelay(5);

	/* Initialise AC97 middle-layer */
	if ((err = snd_ac97_bus(au1000->card, 0, &ops, au1000, &pbus)) < 0)
 		return err;

	memset(&ac97, 0, sizeof(ac97));
	ac97.private_data = au1000;
	if ((err = snd_ac97_mixer(pbus, &ac97, &au1000->ac97)) < 0)
		return err;

	return 0;
}

/*------------------------------ Setup / Destroy ----------------------------*/

void
snd_au1000_free(struct snd_card *card)
{
	struct snd_au1000 *au1000 = card->private_data;

	if (au1000->ac97_res_port) {
		/* put internal AC97 block into reset */
		au1000->ac97_ioport->cntrl = AC97C_RS;
		au1000->ac97_ioport = NULL;
		release_and_free_resource(au1000->ac97_res_port);
	}

	if (au1000->stream[PLAYBACK]) {
	  	if (au1000->stream[PLAYBACK]->dma >= 0)
			free_au1000_dma(au1000->stream[PLAYBACK]->dma);
		kfree(au1000->stream[PLAYBACK]);
	}

	if (au1000->stream[CAPTURE]) {
		if (au1000->stream[CAPTURE]->dma >= 0)
			free_au1000_dma(au1000->stream[CAPTURE]->dma);
		kfree(au1000->stream[CAPTURE]);
	}
}


static struct snd_card *au1000_card;

static int __init
au1000_init(void)
{
	int err;
	struct snd_card *card;
	struct snd_au1000 *au1000;

	card = snd_card_new(-1, "AC97", THIS_MODULE, sizeof(struct snd_au1000));
	if (card == NULL)
		return -ENOMEM;

	card->private_free = snd_au1000_free;
	au1000 = card->private_data;
	au1000->card = card;

	au1000->stream[PLAYBACK] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
	au1000->stream[CAPTURE ] = kmalloc(sizeof(struct audio_stream), GFP_KERNEL);
	/* so that snd_au1000_free will work as intended */
 	au1000->ac97_res_port = NULL;
	if (au1000->stream[PLAYBACK])
		au1000->stream[PLAYBACK]->dma = -1;
	if (au1000->stream[CAPTURE ])
		au1000->stream[CAPTURE ]->dma = -1;

	if (au1000->stream[PLAYBACK] == NULL ||
	    au1000->stream[CAPTURE ] == NULL) {
		snd_card_free(card);
		return -ENOMEM;
	}

	if ((err = snd_au1000_ac97_new(au1000)) < 0 ) {
		snd_card_free(card);
		return err;
	}

	if ((err = snd_au1000_pcm_new(au1000)) < 0) {
		snd_card_free(card);
		return err;
	}

	strcpy(card->driver, "Au1000-AC97");
	strcpy(card->shortname, "AMD Au1000-AC97");
	sprintf(card->longname, "AMD Au1000--AC97 ALSA Driver");

	if ((err = snd_card_register(card)) < 0) {
		snd_card_free(card);
		return err;
	}

	printk( KERN_INFO "ALSA AC97: Driver Initialized\n" );
	au1000_card = card;
	return 0;
}

static void __exit au1000_exit(void)
{
	snd_card_free(au1000_card);
}

module_init(au1000_init);
module_exit(au1000_exit);