[deliverable/linux.git] / sound / soc / fsl / mpc5200_dma.c

/*
 * Freescale MPC5200 PSC DMA
 * ALSA SoC Platform driver
 *
 * Copyright (C) 2008 Secret Lab Technologies Ltd.
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/dma-mapping.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/initval.h>
#include <sound/soc.h>
#include <sound/soc-of-simple.h>

#include <sysdev/bestcomm/bestcomm.h>
#include <sysdev/bestcomm/gen_bd.h>
#include <asm/mpc52xx_psc.h>

#include "mpc5200_dma.h"

MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
MODULE_LICENSE("GPL");

/*
 * Interrupt handlers
 */
static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
{
	struct psc_dma *psc_dma = _psc_dma;
	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
	u16 isr;

	isr = in_be16(&regs->mpc52xx_psc_isr);

	/* Playback underrun error */
	if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
		psc_dma->stats.underrun_count++;

	/* Capture overrun error */
	if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
		psc_dma->stats.overrun_count++;

	out_8(&regs->command, 4 << 4);	/* reset the error status */

	return IRQ_HANDLED;
}

/**
 * psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
 * @s: pointer to stream private data structure
 *
 * Enqueues another audio period buffer into the bestcomm queue.
 *
 * Note: The routine must only be called when there is space available in
 * the queue.  Otherwise the enqueue will fail and the audio ring buffer
 * will get out of sync
 */
static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
{
	struct bcom_bd *bd;

	/* Prepare and enqueue the next buffer descriptor */
	bd = bcom_prepare_next_buffer(s->bcom_task);
	bd->status = s->period_bytes;
	bd->data[0] = s->period_next_pt;
	bcom_submit_next_buffer(s->bcom_task, NULL);

	/* Update for next period */
	s->period_next_pt += s->period_bytes;
	if (s->period_next_pt >= s->period_end)
		s->period_next_pt = s->period_start;
}

/* Bestcomm DMA irq handler */
static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream)
{
	struct psc_dma_stream *s = _psc_dma_stream;

	/* For each finished period, dequeue the completed period buffer
	 * and enqueue a new one in it's place. */
	while (bcom_buffer_done(s->bcom_task)) {
		bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
		s->period_current_pt += s->period_bytes;
		if (s->period_current_pt >= s->period_end)
			s->period_current_pt = s->period_start;
		psc_dma_bcom_enqueue_next_buffer(s);
		bcom_enable(s->bcom_task);
	}

	/* If the stream is active, then also inform the PCM middle layer
	 * of the period finished event. */
	if (s->active)
		snd_pcm_period_elapsed(s->stream);

	return IRQ_HANDLED;
}

/**
 * psc_dma_startup: create a new substream
 *
 * This is the first function called when a stream is opened.
 *
 * If this is the first stream open, then grab the IRQ and program most of
 * the PSC registers.
 */
int psc_dma_startup(struct snd_pcm_substream *substream,
			   struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
	int rc;

	dev_dbg(psc_dma->dev, "psc_dma_startup(substream=%p)\n", substream);

	if (!psc_dma->playback.active &&
	    !psc_dma->capture.active) {
		/* Setup the IRQs */
		rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
				 "psc-dma-status", psc_dma);
		rc |= request_irq(psc_dma->capture.irq,
				  &psc_dma_bcom_irq, IRQF_SHARED,
				  "psc-dma-capture", &psc_dma->capture);
		rc |= request_irq(psc_dma->playback.irq,
				  &psc_dma_bcom_irq, IRQF_SHARED,
				  "psc-dma-playback", &psc_dma->playback);
		if (rc) {
			free_irq(psc_dma->irq, psc_dma);
			free_irq(psc_dma->capture.irq,
				 &psc_dma->capture);
			free_irq(psc_dma->playback.irq,
				 &psc_dma->playback);
			return -ENODEV;
		}
	}

	return 0;
}

int psc_dma_hw_free(struct snd_pcm_substream *substream,
			   struct snd_soc_dai *dai)
{
	snd_pcm_set_runtime_buffer(substream, NULL);
	return 0;
}

/**
 * psc_dma_trigger: start and stop the DMA transfer.
 *
 * This function is called by ALSA to start, stop, pause, and resume the DMA
 * transfer of data.
 */
int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd,
			   struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct psc_dma_stream *s;
	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
	u16 imr;
	u8 psc_cmd;
	unsigned long flags;

	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
		s = &psc_dma->capture;
	else
		s = &psc_dma->playback;

	dev_dbg(psc_dma->dev, "psc_dma_trigger(substream=%p, cmd=%i)"
		" stream_id=%i\n",
		substream, cmd, substream->pstr->stream);

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		s->period_bytes = frames_to_bytes(runtime,
						  runtime->period_size);
		s->period_start = virt_to_phys(runtime->dma_area);
		s->period_end = s->period_start +
				(s->period_bytes * runtime->periods);
		s->period_next_pt = s->period_start;
		s->period_current_pt = s->period_start;
		s->active = 1;

		/* First; reset everything */
		if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
			out_8(&regs->command, MPC52xx_PSC_RST_RX);
			out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
		} else {
			out_8(&regs->command, MPC52xx_PSC_RST_TX);
			out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
		}

		/* Next, fill up the bestcomm bd queue and enable DMA.
		 * This will begin filling the PSC's fifo. */
		if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
			bcom_gen_bd_rx_reset(s->bcom_task);
		else
			bcom_gen_bd_tx_reset(s->bcom_task);
		while (!bcom_queue_full(s->bcom_task))
			psc_dma_bcom_enqueue_next_buffer(s);
		bcom_enable(s->bcom_task);

		/* Due to errata in the dma mode; need to line up enabling
		 * the transmitter with a transition on the frame sync
		 * line */

		spin_lock_irqsave(&psc_dma->lock, flags);
		/* first make sure it is low */
		while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) != 0)
			;
		/* then wait for the transition to high */
		while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) == 0)
			;
		/* Finally, enable the PSC.
		 * Receiver must always be enabled; even when we only want
		 * transmit.  (see 15.3.2.3 of MPC5200B User's Guide) */
		psc_cmd = MPC52xx_PSC_RX_ENABLE;
		if (substream->pstr->stream == SNDRV_PCM_STREAM_PLAYBACK)
			psc_cmd |= MPC52xx_PSC_TX_ENABLE;
		out_8(&regs->command, psc_cmd);
		spin_unlock_irqrestore(&psc_dma->lock, flags);

		break;

	case SNDRV_PCM_TRIGGER_STOP:
		/* Turn off the PSC */
		s->active = 0;
		if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
			if (!psc_dma->playback.active) {
				out_8(&regs->command, 2 << 4);	/* reset rx */
				out_8(&regs->command, 3 << 4);	/* reset tx */
				out_8(&regs->command, 4 << 4);	/* reset err */
			}
		} else {
			out_8(&regs->command, 3 << 4);	/* reset tx */
			out_8(&regs->command, 4 << 4);	/* reset err */
			if (!psc_dma->capture.active)
				out_8(&regs->command, 2 << 4);	/* reset rx */
		}

		bcom_disable(s->bcom_task);
		while (!bcom_queue_empty(s->bcom_task))
			bcom_retrieve_buffer(s->bcom_task, NULL, NULL);

		break;

	default:
		dev_dbg(psc_dma->dev, "invalid command\n");
		return -EINVAL;
	}

	/* Update interrupt enable settings */
	imr = 0;
	if (psc_dma->playback.active)
		imr |= MPC52xx_PSC_IMR_TXEMP;
	if (psc_dma->capture.active)
		imr |= MPC52xx_PSC_IMR_ORERR;
	out_be16(&regs->isr_imr.imr, imr);

	return 0;
}

/**
 * psc_dma_shutdown: shutdown the data transfer on a stream
 *
 * Shutdown the PSC if there are no other substreams open.
 */
void psc_dma_shutdown(struct snd_pcm_substream *substream,
			     struct snd_soc_dai *dai)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;

	dev_dbg(psc_dma->dev, "psc_dma_shutdown(substream=%p)\n", substream);

	/*
	 * If this is the last active substream, disable the PSC and release
	 * the IRQ.
	 */
	if (!psc_dma->playback.active &&
	    !psc_dma->capture.active) {

		/* Disable all interrupts and reset the PSC */
		out_be16(&psc_dma->psc_regs->isr_imr.imr, 0);
		out_8(&psc_dma->psc_regs->command, 3 << 4); /* reset tx */
		out_8(&psc_dma->psc_regs->command, 2 << 4); /* reset rx */
		out_8(&psc_dma->psc_regs->command, 1 << 4); /* reset mode */
		out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */

		/* Release irqs */
		free_irq(psc_dma->irq, psc_dma);
		free_irq(psc_dma->capture.irq, &psc_dma->capture);
		free_irq(psc_dma->playback.irq, &psc_dma->playback);
	}
}

/* ---------------------------------------------------------------------
 * The PSC DMA 'ASoC platform' driver
 *
 * Can be referenced by an 'ASoC machine' driver
 * This driver only deals with the audio bus; it doesn't have any
 * interaction with the attached codec
 */

static const struct snd_pcm_hardware psc_dma_pcm_hardware = {
	.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
		SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
		SNDRV_PCM_INFO_BATCH,
	.formats = SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE |
		   SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S32_BE,
	.rate_min = 8000,
	.rate_max = 48000,
	.channels_min = 2,
	.channels_max = 2,
	.period_bytes_max	= 1024 * 1024,
	.period_bytes_min	= 32,
	.periods_min		= 2,
	.periods_max		= 256,
	.buffer_bytes_max	= 2 * 1024 * 1024,
	.fifo_size		= 0,
};

static int psc_dma_pcm_open(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
	struct psc_dma_stream *s;

	dev_dbg(psc_dma->dev, "psc_dma_pcm_open(substream=%p)\n", substream);

	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
		s = &psc_dma->capture;
	else
		s = &psc_dma->playback;

	snd_soc_set_runtime_hwparams(substream, &psc_dma_pcm_hardware);

	s->stream = substream;
	return 0;
}

static int psc_dma_pcm_close(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
	struct psc_dma_stream *s;

	dev_dbg(psc_dma->dev, "psc_dma_pcm_close(substream=%p)\n", substream);

	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
		s = &psc_dma->capture;
	else
		s = &psc_dma->playback;

	s->stream = NULL;
	return 0;
}

static snd_pcm_uframes_t
psc_dma_pcm_pointer(struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
	struct psc_dma_stream *s;
	dma_addr_t count;

	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
		s = &psc_dma->capture;
	else
		s = &psc_dma->playback;

	count = s->period_current_pt - s->period_start;

	return bytes_to_frames(substream->runtime, count);
}

static struct snd_pcm_ops psc_dma_pcm_ops = {
	.open		= psc_dma_pcm_open,
	.close		= psc_dma_pcm_close,
	.ioctl		= snd_pcm_lib_ioctl,
	.pointer	= psc_dma_pcm_pointer,
};

static u64 psc_dma_pcm_dmamask = 0xffffffff;
static int psc_dma_pcm_new(struct snd_card *card, struct snd_soc_dai *dai,
			   struct snd_pcm *pcm)
{
	struct snd_soc_pcm_runtime *rtd = pcm->private_data;
	size_t size = psc_dma_pcm_hardware.buffer_bytes_max;
	int rc = 0;

	dev_dbg(rtd->socdev->dev, "psc_dma_pcm_new(card=%p, dai=%p, pcm=%p)\n",
		card, dai, pcm);

	if (!card->dev->dma_mask)
		card->dev->dma_mask = &psc_dma_pcm_dmamask;
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = 0xffffffff;

	if (pcm->streams[0].substream) {
		rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size,
					&pcm->streams[0].substream->dma_buffer);
		if (rc)
			goto playback_alloc_err;
	}

	if (pcm->streams[1].substream) {
		rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size,
					&pcm->streams[1].substream->dma_buffer);
		if (rc)
			goto capture_alloc_err;
	}

	return 0;

 capture_alloc_err:
	if (pcm->streams[0].substream)
		snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer);
 playback_alloc_err:
	dev_err(card->dev, "Cannot allocate buffer(s)\n");
	return -ENOMEM;
}

static void psc_dma_pcm_free(struct snd_pcm *pcm)
{
	struct snd_soc_pcm_runtime *rtd = pcm->private_data;
	struct snd_pcm_substream *substream;
	int stream;

	dev_dbg(rtd->socdev->dev, "psc_dma_pcm_free(pcm=%p)\n", pcm);

	for (stream = 0; stream < 2; stream++) {
		substream = pcm->streams[stream].substream;
		if (substream) {
			snd_dma_free_pages(&substream->dma_buffer);
			substream->dma_buffer.area = NULL;
			substream->dma_buffer.addr = 0;
		}
	}
}

struct snd_soc_platform psc_dma_pcm_soc_platform = {
	.name		= "mpc5200-psc-audio",
	.pcm_ops	= &psc_dma_pcm_ops,
	.pcm_new	= &psc_dma_pcm_new,
	.pcm_free	= &psc_dma_pcm_free,
};
Commit	Line	Data
89dd0842 JS	1	/*
	2	* Freescale MPC5200 PSC DMA
	3	* ALSA SoC Platform driver
	4	*
	5	* Copyright (C) 2008 Secret Lab Technologies Ltd.
	6	*/
	7
	8	#include <linux/init.h>
	9	#include <linux/module.h>
	10	#include <linux/interrupt.h>
	11	#include <linux/device.h>
	12	#include <linux/delay.h>
	13	#include <linux/of_device.h>
	14	#include <linux/of_platform.h>
	15	#include <linux/dma-mapping.h>
	16
	17	#include <sound/core.h>
	18	#include <sound/pcm.h>
	19	#include <sound/pcm_params.h>
	20	#include <sound/initval.h>
	21	#include <sound/soc.h>
	22	#include <sound/soc-of-simple.h>
	23
	24	#include <sysdev/bestcomm/bestcomm.h>
	25	#include <sysdev/bestcomm/gen_bd.h>
	26	#include <asm/mpc52xx_psc.h>
	27
	28	#include "mpc5200_dma.h"
	29
	30	MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
	31	MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
	32	MODULE_LICENSE("GPL");
	33
	34	/*
	35	* Interrupt handlers
	36	*/
cebe7767	37	static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
89dd0842	38	{
cebe7767 JS	39	struct psc_dma *psc_dma = _psc_dma;
cebe7767 JS	40	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
89dd0842 JS	41	u16 isr;
	42
	43	isr = in_be16(&regs->mpc52xx_psc_isr);
	44
	45	/* Playback underrun error */
cebe7767 JS	46	if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
cebe7767 JS	47	psc_dma->stats.underrun_count++;
89dd0842 JS	48
89dd0842 JS	49	/* Capture overrun error */
cebe7767 JS	50	if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
cebe7767 JS	51	psc_dma->stats.overrun_count++;
89dd0842 JS	52
	53	out_8(&regs->command, 4 << 4); /* reset the error status */
	54
	55	return IRQ_HANDLED;
	56	}
	57
	58	/**
cebe7767	59	* psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
89dd0842 JS	60	* @s: pointer to stream private data structure
	61	*
	62	* Enqueues another audio period buffer into the bestcomm queue.
	63	*
	64	* Note: The routine must only be called when there is space available in
	65	* the queue. Otherwise the enqueue will fail and the audio ring buffer
	66	* will get out of sync
	67	*/
cebe7767	68	static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
89dd0842 JS	69	{
	70	struct bcom_bd *bd;
	71
	72	/* Prepare and enqueue the next buffer descriptor */
	73	bd = bcom_prepare_next_buffer(s->bcom_task);
	74	bd->status = s->period_bytes;
	75	bd->data[0] = s->period_next_pt;
	76	bcom_submit_next_buffer(s->bcom_task, NULL);
	77
	78	/* Update for next period */
	79	s->period_next_pt += s->period_bytes;
	80	if (s->period_next_pt >= s->period_end)
	81	s->period_next_pt = s->period_start;
	82	}
	83
	84	/* Bestcomm DMA irq handler */
cebe7767	85	static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream)
89dd0842	86	{
cebe7767	87	struct psc_dma_stream *s = _psc_dma_stream;
89dd0842 JS	88
	89	/* For each finished period, dequeue the completed period buffer
	90	* and enqueue a new one in it's place. */
	91	while (bcom_buffer_done(s->bcom_task)) {
	92	bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
	93	s->period_current_pt += s->period_bytes;
	94	if (s->period_current_pt >= s->period_end)
	95	s->period_current_pt = s->period_start;
cebe7767	96	psc_dma_bcom_enqueue_next_buffer(s);
89dd0842 JS	97	bcom_enable(s->bcom_task);
	98	}
	99
	100	/* If the stream is active, then also inform the PCM middle layer
	101	* of the period finished event. */
	102	if (s->active)
	103	snd_pcm_period_elapsed(s->stream);
	104
	105	return IRQ_HANDLED;
	106	}
	107
	108	/**
cebe7767	109	* psc_dma_startup: create a new substream
89dd0842 JS	110	*
	111	* This is the first function called when a stream is opened.
	112	*
	113	* If this is the first stream open, then grab the IRQ and program most of
	114	* the PSC registers.
	115	*/
cebe7767	116	int psc_dma_startup(struct snd_pcm_substream *substream,
89dd0842 JS	117	struct snd_soc_dai *dai)
	118	{
	119	struct snd_soc_pcm_runtime *rtd = substream->private_data;
cebe7767	120	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
89dd0842 JS	121	int rc;
89dd0842 JS	122
cebe7767	123	dev_dbg(psc_dma->dev, "psc_dma_startup(substream=%p)\n", substream);
89dd0842	124
cebe7767 JS	125	if (!psc_dma->playback.active &&
cebe7767 JS	126	!psc_dma->capture.active) {
89dd0842	127	/* Setup the IRQs */
cebe7767 JS	128	rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
	129	"psc-dma-status", psc_dma);
	130	rc \|= request_irq(psc_dma->capture.irq,
	131	&psc_dma_bcom_irq, IRQF_SHARED,
	132	"psc-dma-capture", &psc_dma->capture);
	133	rc \|= request_irq(psc_dma->playback.irq,
	134	&psc_dma_bcom_irq, IRQF_SHARED,
	135	"psc-dma-playback", &psc_dma->playback);
89dd0842	136	if (rc) {
cebe7767 JS	137	free_irq(psc_dma->irq, psc_dma);
	138	free_irq(psc_dma->capture.irq,
	139	&psc_dma->capture);
	140	free_irq(psc_dma->playback.irq,
	141	&psc_dma->playback);
89dd0842 JS	142	return -ENODEV;
	143	}
	144	}
	145
	146	return 0;
	147	}
	148
cebe7767	149	int psc_dma_hw_free(struct snd_pcm_substream *substream,
89dd0842 JS	150	struct snd_soc_dai *dai)
	151	{
	152	snd_pcm_set_runtime_buffer(substream, NULL);
	153	return 0;
	154	}
	155
	156	/**
cebe7767	157	* psc_dma_trigger: start and stop the DMA transfer.
89dd0842 JS	158	*
	159	* This function is called by ALSA to start, stop, pause, and resume the DMA
	160	* transfer of data.
	161	*/
cebe7767	162	int psc_dma_trigger(struct snd_pcm_substream *substream, int cmd,
89dd0842 JS	163	struct snd_soc_dai *dai)
	164	{
	165	struct snd_soc_pcm_runtime *rtd = substream->private_data;
cebe7767	166	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
89dd0842	167	struct snd_pcm_runtime *runtime = substream->runtime;
cebe7767 JS	168	struct psc_dma_stream *s;
cebe7767 JS	169	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
89dd0842 JS	170	u16 imr;
	171	u8 psc_cmd;
	172	unsigned long flags;
	173
	174	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
cebe7767	175	s = &psc_dma->capture;
89dd0842	176	else
cebe7767	177	s = &psc_dma->playback;
89dd0842	178
cebe7767	179	dev_dbg(psc_dma->dev, "psc_dma_trigger(substream=%p, cmd=%i)"
89dd0842 JS	180	" stream_id=%i\n",
	181	substream, cmd, substream->pstr->stream);
	182
	183	switch (cmd) {
	184	case SNDRV_PCM_TRIGGER_START:
	185	s->period_bytes = frames_to_bytes(runtime,
	186	runtime->period_size);
	187	s->period_start = virt_to_phys(runtime->dma_area);
	188	s->period_end = s->period_start +
	189	(s->period_bytes * runtime->periods);
	190	s->period_next_pt = s->period_start;
	191	s->period_current_pt = s->period_start;
	192	s->active = 1;
	193
	194	/* First; reset everything */
	195	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
	196	out_8(&regs->command, MPC52xx_PSC_RST_RX);
	197	out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
	198	} else {
	199	out_8(&regs->command, MPC52xx_PSC_RST_TX);
	200	out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
	201	}
	202
	203	/* Next, fill up the bestcomm bd queue and enable DMA.
	204	* This will begin filling the PSC's fifo. */
	205	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
	206	bcom_gen_bd_rx_reset(s->bcom_task);
	207	else
	208	bcom_gen_bd_tx_reset(s->bcom_task);
	209	while (!bcom_queue_full(s->bcom_task))
cebe7767	210	psc_dma_bcom_enqueue_next_buffer(s);
89dd0842 JS	211	bcom_enable(s->bcom_task);
89dd0842 JS	212
cebe7767	213	/* Due to errata in the dma mode; need to line up enabling
89dd0842 JS	214	* the transmitter with a transition on the frame sync
	215	* line */
	216
cebe7767	217	spin_lock_irqsave(&psc_dma->lock, flags);
89dd0842 JS	218	/* first make sure it is low */
	219	while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) != 0)
	220	;
	221	/* then wait for the transition to high */
	222	while ((in_8(&regs->ipcr_acr.ipcr) & 0x80) == 0)
	223	;
	224	/* Finally, enable the PSC.
	225	* Receiver must always be enabled; even when we only want
	226	* transmit. (see 15.3.2.3 of MPC5200B User's Guide) */
	227	psc_cmd = MPC52xx_PSC_RX_ENABLE;
	228	if (substream->pstr->stream == SNDRV_PCM_STREAM_PLAYBACK)
	229	psc_cmd \|= MPC52xx_PSC_TX_ENABLE;
	230	out_8(&regs->command, psc_cmd);
cebe7767	231	spin_unlock_irqrestore(&psc_dma->lock, flags);
89dd0842 JS	232
	233	break;
	234
	235	case SNDRV_PCM_TRIGGER_STOP:
	236	/* Turn off the PSC */
	237	s->active = 0;
	238	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) {
cebe7767	239	if (!psc_dma->playback.active) {
89dd0842 JS	240	out_8(&regs->command, 2 << 4); /* reset rx */
	241	out_8(&regs->command, 3 << 4); /* reset tx */
	242	out_8(&regs->command, 4 << 4); /* reset err */
	243	}
	244	} else {
	245	out_8(&regs->command, 3 << 4); /* reset tx */
	246	out_8(&regs->command, 4 << 4); /* reset err */
cebe7767	247	if (!psc_dma->capture.active)
89dd0842 JS	248	out_8(&regs->command, 2 << 4); /* reset rx */
	249	}
	250
	251	bcom_disable(s->bcom_task);
	252	while (!bcom_queue_empty(s->bcom_task))
	253	bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
	254
	255	break;
	256
	257	default:
cebe7767	258	dev_dbg(psc_dma->dev, "invalid command\n");
89dd0842 JS	259	return -EINVAL;
	260	}
	261
	262	/* Update interrupt enable settings */
	263	imr = 0;
cebe7767	264	if (psc_dma->playback.active)
89dd0842	265	imr \|= MPC52xx_PSC_IMR_TXEMP;
cebe7767	266	if (psc_dma->capture.active)
89dd0842 JS	267	imr \|= MPC52xx_PSC_IMR_ORERR;
	268	out_be16(&regs->isr_imr.imr, imr);
	269
	270	return 0;
	271	}
	272
	273	/**
cebe7767	274	* psc_dma_shutdown: shutdown the data transfer on a stream
89dd0842 JS	275	*
	276	* Shutdown the PSC if there are no other substreams open.
	277	*/
cebe7767	278	void psc_dma_shutdown(struct snd_pcm_substream *substream,
89dd0842 JS	279	struct snd_soc_dai *dai)
	280	{
	281	struct snd_soc_pcm_runtime *rtd = substream->private_data;
cebe7767	282	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
89dd0842	283
cebe7767	284	dev_dbg(psc_dma->dev, "psc_dma_shutdown(substream=%p)\n", substream);
89dd0842 JS	285
	286	/*
	287	* If this is the last active substream, disable the PSC and release
	288	* the IRQ.
	289	*/
cebe7767 JS	290	if (!psc_dma->playback.active &&
cebe7767 JS	291	!psc_dma->capture.active) {
89dd0842 JS	292
89dd0842 JS	293	/* Disable all interrupts and reset the PSC */
cebe7767 JS	294	out_be16(&psc_dma->psc_regs->isr_imr.imr, 0);
	295	out_8(&psc_dma->psc_regs->command, 3 << 4); /* reset tx */
	296	out_8(&psc_dma->psc_regs->command, 2 << 4); /* reset rx */
	297	out_8(&psc_dma->psc_regs->command, 1 << 4); /* reset mode */
	298	out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
89dd0842 JS	299
89dd0842 JS	300	/* Release irqs */
cebe7767 JS	301	free_irq(psc_dma->irq, psc_dma);
	302	free_irq(psc_dma->capture.irq, &psc_dma->capture);
	303	free_irq(psc_dma->playback.irq, &psc_dma->playback);
89dd0842 JS	304	}
	305	}
	306
	307	/* ---------------------------------------------------------------------
	308	* The PSC DMA 'ASoC platform' driver
	309	*
	310	* Can be referenced by an 'ASoC machine' driver
	311	* This driver only deals with the audio bus; it doesn't have any
	312	* interaction with the attached codec
	313	*/
	314
cebe7767	315	static const struct snd_pcm_hardware psc_dma_pcm_hardware = {
89dd0842 JS	316	.info = SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_MMAP_VALID \|
	317	SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	318	SNDRV_PCM_INFO_BATCH,
	319	.formats = SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_S16_BE \|
	320	SNDRV_PCM_FMTBIT_S24_BE \| SNDRV_PCM_FMTBIT_S32_BE,
	321	.rate_min = 8000,
	322	.rate_max = 48000,
	323	.channels_min = 2,
	324	.channels_max = 2,
	325	.period_bytes_max = 1024 * 1024,
	326	.period_bytes_min = 32,
	327	.periods_min = 2,
	328	.periods_max = 256,
	329	.buffer_bytes_max = 2 * 1024 * 1024,
	330	.fifo_size = 0,
	331	};
	332
cebe7767	333	static int psc_dma_pcm_open(struct snd_pcm_substream *substream)
89dd0842 JS	334	{
89dd0842 JS	335	struct snd_soc_pcm_runtime *rtd = substream->private_data;
cebe7767 JS	336	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
cebe7767 JS	337	struct psc_dma_stream *s;
89dd0842	338
cebe7767	339	dev_dbg(psc_dma->dev, "psc_dma_pcm_open(substream=%p)\n", substream);
89dd0842 JS	340
89dd0842 JS	341	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
cebe7767	342	s = &psc_dma->capture;
89dd0842	343	else
cebe7767	344	s = &psc_dma->playback;
89dd0842	345
cebe7767	346	snd_soc_set_runtime_hwparams(substream, &psc_dma_pcm_hardware);
89dd0842 JS	347
	348	s->stream = substream;
	349	return 0;
	350	}
	351
cebe7767	352	static int psc_dma_pcm_close(struct snd_pcm_substream *substream)
89dd0842 JS	353	{
89dd0842 JS	354	struct snd_soc_pcm_runtime *rtd = substream->private_data;
cebe7767 JS	355	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
cebe7767 JS	356	struct psc_dma_stream *s;
89dd0842	357
cebe7767	358	dev_dbg(psc_dma->dev, "psc_dma_pcm_close(substream=%p)\n", substream);
89dd0842 JS	359
89dd0842 JS	360	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
cebe7767	361	s = &psc_dma->capture;
89dd0842	362	else
cebe7767	363	s = &psc_dma->playback;
89dd0842 JS	364
	365	s->stream = NULL;
	366	return 0;
	367	}
	368
	369	static snd_pcm_uframes_t
cebe7767	370	psc_dma_pcm_pointer(struct snd_pcm_substream *substream)
89dd0842 JS	371	{
89dd0842 JS	372	struct snd_soc_pcm_runtime *rtd = substream->private_data;
cebe7767 JS	373	struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data;
cebe7767 JS	374	struct psc_dma_stream *s;
89dd0842 JS	375	dma_addr_t count;
	376
	377	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
cebe7767	378	s = &psc_dma->capture;
89dd0842	379	else
cebe7767	380	s = &psc_dma->playback;
89dd0842 JS	381
	382	count = s->period_current_pt - s->period_start;
	383
	384	return bytes_to_frames(substream->runtime, count);
	385	}
	386
cebe7767 JS	387	static struct snd_pcm_ops psc_dma_pcm_ops = {
	388	.open = psc_dma_pcm_open,
	389	.close = psc_dma_pcm_close,
89dd0842	390	.ioctl = snd_pcm_lib_ioctl,
cebe7767	391	.pointer = psc_dma_pcm_pointer,
89dd0842 JS	392	};
89dd0842 JS	393
cebe7767 JS	394	static u64 psc_dma_pcm_dmamask = 0xffffffff;
cebe7767 JS	395	static int psc_dma_pcm_new(struct snd_card card, struct snd_soc_dai dai,
89dd0842 JS	396	struct snd_pcm *pcm)
	397	{
	398	struct snd_soc_pcm_runtime *rtd = pcm->private_data;
cebe7767	399	size_t size = psc_dma_pcm_hardware.buffer_bytes_max;
89dd0842 JS	400	int rc = 0;
89dd0842 JS	401
cebe7767	402	dev_dbg(rtd->socdev->dev, "psc_dma_pcm_new(card=%p, dai=%p, pcm=%p)\n",
89dd0842 JS	403	card, dai, pcm);
	404
	405	if (!card->dev->dma_mask)
cebe7767	406	card->dev->dma_mask = &psc_dma_pcm_dmamask;
89dd0842 JS	407	if (!card->dev->coherent_dma_mask)
	408	card->dev->coherent_dma_mask = 0xffffffff;
	409
	410	if (pcm->streams[0].substream) {
	411	rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size,
	412	&pcm->streams[0].substream->dma_buffer);
	413	if (rc)
	414	goto playback_alloc_err;
	415	}
	416
	417	if (pcm->streams[1].substream) {
	418	rc = snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, pcm->dev, size,
	419	&pcm->streams[1].substream->dma_buffer);
	420	if (rc)
	421	goto capture_alloc_err;
	422	}
	423
	424	return 0;
	425
	426	capture_alloc_err:
	427	if (pcm->streams[0].substream)
	428	snd_dma_free_pages(&pcm->streams[0].substream->dma_buffer);
	429	playback_alloc_err:
	430	dev_err(card->dev, "Cannot allocate buffer(s)\n");
	431	return -ENOMEM;
	432	}
	433
cebe7767	434	static void psc_dma_pcm_free(struct snd_pcm *pcm)
89dd0842 JS	435	{
	436	struct snd_soc_pcm_runtime *rtd = pcm->private_data;
	437	struct snd_pcm_substream *substream;
	438	int stream;
	439
cebe7767	440	dev_dbg(rtd->socdev->dev, "psc_dma_pcm_free(pcm=%p)\n", pcm);
89dd0842 JS	441
	442	for (stream = 0; stream < 2; stream++) {
	443	substream = pcm->streams[stream].substream;
	444	if (substream) {
	445	snd_dma_free_pages(&substream->dma_buffer);
	446	substream->dma_buffer.area = NULL;
	447	substream->dma_buffer.addr = 0;
	448	}
	449	}
	450	}
	451
cebe7767	452	struct snd_soc_platform psc_dma_pcm_soc_platform = {
89dd0842	453	.name = "mpc5200-psc-audio",
cebe7767 JS	454	.pcm_ops = &psc_dma_pcm_ops,
	455	.pcm_new = &psc_dma_pcm_new,
	456	.pcm_free = &psc_dma_pcm_free,
89dd0842 JS	457	};
89dd0842 JS	458