[linux-block.git] / sound / soc / fsl / mpc5200_dma.c

// SPDX-License-Identifier: GPL-2.0-only
//
// Freescale MPC5200 PSC DMA
// ALSA SoC Platform driver
//
// Copyright (C) 2008 Secret Lab Technologies Ltd.
// Copyright (C) 2009 Jon Smirl, Digispeaker

#include <linux/module.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>

#include <sound/soc.h>

#include <linux/fsl/bestcomm/bestcomm.h>
#include <linux/fsl/bestcomm/gen_bd.h>
#include <asm/mpc52xx_psc.h>

#include "mpc5200_dma.h"

#define DRV_NAME "mpc5200_dma"

/*
 * 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, MPC52xx_PSC_RST_ERR_STAT);

	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->runtime->dma_addr + (s->period_next * s->period_bytes);
	bcom_submit_next_buffer(s->bcom_task, NULL);

	/* Update for next period */
	s->period_next = (s->period_next + 1) % s->runtime->periods;
}

/* 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;

	spin_lock(&s->psc_dma->lock);
	/* 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 = (s->period_current+1) % s->runtime->periods;
		s->period_count++;

		psc_dma_bcom_enqueue_next_buffer(s);
	}
	spin_unlock(&s->psc_dma->lock);

	/* 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_trigger: start and stop the DMA transfer.
 * @component: triggered component
 * @substream: triggered substream
 * @cmd: triggered command
 *
 * This function is called by ALSA to start, stop, pause, and resume the DMA
 * transfer of data.
 */
static int psc_dma_trigger(struct snd_soc_component *component,
			   struct snd_pcm_substream *substream, int cmd)
{
	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
	u16 imr;
	unsigned long flags;
	int i;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
		dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n",
			substream->pstr->stream, runtime->frame_bits,
			(int)runtime->period_size, runtime->periods);
		s->period_bytes = frames_to_bytes(runtime,
						  runtime->period_size);
		s->period_next = 0;
		s->period_current = 0;
		s->active = 1;
		s->period_count = 0;
		s->runtime = runtime;

		/* Fill up the bestcomm bd queue and enable DMA.
		 * This will begin filling the PSC's fifo.
		 */
		spin_lock_irqsave(&psc_dma->lock, flags);

		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);

		for (i = 0; i < runtime->periods; i++)
			if (!bcom_queue_full(s->bcom_task))
				psc_dma_bcom_enqueue_next_buffer(s);

		bcom_enable(s->bcom_task);
		spin_unlock_irqrestore(&psc_dma->lock, flags);

		out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);

		break;

	case SNDRV_PCM_TRIGGER_STOP:
		dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n",
			substream->pstr->stream, s->period_count);
		s->active = 0;

		spin_lock_irqsave(&psc_dma->lock, flags);
		bcom_disable(s->bcom_task);
		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);
		spin_unlock_irqrestore(&psc_dma->lock, flags);

		break;

	default:
		dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n",
			substream->pstr->stream, cmd);
		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, psc_dma->imr | imr);

	return 0;
}


/* ---------------------------------------------------------------------
 * 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_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,
	.period_bytes_max	= 1024 * 1024,
	.period_bytes_min	= 32,
	.periods_min		= 2,
	.periods_max		= 256,
	.buffer_bytes_max	= 2 * 1024 * 1024,
	.fifo_size		= 512,
};

static int psc_dma_open(struct snd_soc_component *component,
			struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
	struct psc_dma_stream *s;
	int rc;

	dev_dbg(psc_dma->dev, "psc_dma_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_hardware);

	rc = snd_pcm_hw_constraint_integer(runtime,
		SNDRV_PCM_HW_PARAM_PERIODS);
	if (rc < 0) {
		dev_err(substream->pcm->card->dev, "invalid buffer size\n");
		return rc;
	}

	s->stream = substream;
	return 0;
}

static int psc_dma_close(struct snd_soc_component *component,
			 struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
	struct psc_dma_stream *s;

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

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

	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, psc_dma->imr);
		out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
	}
	s->stream = NULL;
	return 0;
}

static snd_pcm_uframes_t
psc_dma_pointer(struct snd_soc_component *component,
		struct snd_pcm_substream *substream)
{
	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
	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 * s->period_bytes;

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

static int psc_dma_new(struct snd_soc_component *component,
		       struct snd_soc_pcm_runtime *rtd)
{
	struct snd_card *card = rtd->card->snd_card;
	struct snd_soc_dai *dai = snd_soc_rtd_to_cpu(rtd, 0);
	struct snd_pcm *pcm = rtd->pcm;
	size_t size = psc_dma_hardware.buffer_bytes_max;
	int rc;

	dev_dbg(component->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
		card, dai, pcm);

	rc = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
	if (rc)
		return rc;

	return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, card->dev,
					    size);
}

static const struct snd_soc_component_driver mpc5200_audio_dma_component = {
	.name		= DRV_NAME,
	.open		= psc_dma_open,
	.close		= psc_dma_close,
	.pointer	= psc_dma_pointer,
	.trigger	= psc_dma_trigger,
	.pcm_construct	= psc_dma_new,
};

int mpc5200_audio_dma_create(struct platform_device *op)
{
	phys_addr_t fifo;
	struct psc_dma *psc_dma;
	struct resource res;
	int size, irq, rc;
	const __be32 *prop;
	void __iomem *regs;
	int ret;

	/* Fetch the registers and IRQ of the PSC */
	irq = irq_of_parse_and_map(op->dev.of_node, 0);
	if (of_address_to_resource(op->dev.of_node, 0, &res)) {
		dev_err(&op->dev, "Missing reg property\n");
		return -ENODEV;
	}
	regs = ioremap(res.start, resource_size(&res));
	if (!regs) {
		dev_err(&op->dev, "Could not map registers\n");
		return -ENODEV;
	}

	/* Allocate and initialize the driver private data */
	psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
	if (!psc_dma) {
		ret = -ENOMEM;
		goto out_unmap;
	}

	/* Get the PSC ID */
	prop = of_get_property(op->dev.of_node, "cell-index", &size);
	if (!prop || size < sizeof *prop) {
		ret = -ENODEV;
		goto out_free;
	}

	spin_lock_init(&psc_dma->lock);
	mutex_init(&psc_dma->mutex);
	psc_dma->id = be32_to_cpu(*prop);
	psc_dma->irq = irq;
	psc_dma->psc_regs = regs;
	psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
	psc_dma->dev = &op->dev;
	psc_dma->playback.psc_dma = psc_dma;
	psc_dma->capture.psc_dma = psc_dma;
	snprintf(psc_dma->name, sizeof(psc_dma->name), "PSC%d", psc_dma->id);

	/* Find the address of the fifo data registers and setup the
	 * DMA tasks */
	fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
	psc_dma->capture.bcom_task =
		bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
	psc_dma->playback.bcom_task =
		bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
	if (!psc_dma->capture.bcom_task ||
	    !psc_dma->playback.bcom_task) {
		dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
		ret = -ENODEV;
		goto out_free;
	}

	/* Disable all interrupts and reset the PSC */
	out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
	 /* reset receiver */
	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
	 /* reset transmitter */
	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
	 /* reset error */
	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
	 /* reset mode */
	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);

	/* Set up mode register;
	 * First write: RxRdy (FIFO Alarm) generates rx FIFO irq
	 * Second write: register Normal mode for non loopback
	 */
	out_8(&psc_dma->psc_regs->mode, 0);
	out_8(&psc_dma->psc_regs->mode, 0);

	/* Set the TX and RX fifo alarm thresholds */
	out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
	out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
	out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
	out_8(&psc_dma->fifo_regs->tfcntl, 0x7);

	/* Lookup the IRQ numbers */
	psc_dma->playback.irq =
		bcom_get_task_irq(psc_dma->playback.bcom_task);
	psc_dma->capture.irq =
		bcom_get_task_irq(psc_dma->capture.bcom_task);

	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) {
		ret = -ENODEV;
		goto out_irq;
	}

	/* Save what we've done so it can be found again later */
	dev_set_drvdata(&op->dev, psc_dma);

	/* Tell the ASoC OF helpers about it */
	return devm_snd_soc_register_component(&op->dev,
					&mpc5200_audio_dma_component, NULL, 0);
out_irq:
	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);
out_free:
	kfree(psc_dma);
out_unmap:
	iounmap(regs);
	return ret;
}
EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);

int mpc5200_audio_dma_destroy(struct platform_device *op)
{
	struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);

	dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");

	bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
	bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);

	/* 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);

	iounmap(psc_dma->psc_regs);
	kfree(psc_dma);
	dev_set_drvdata(&op->dev, NULL);

	return 0;
}
EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);

MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0-only
	2	//
	3	// Freescale MPC5200 PSC DMA
	4	// ALSA SoC Platform driver
	5	//
	6	// Copyright (C) 2008 Secret Lab Technologies Ltd.
	7	// Copyright (C) 2009 Jon Smirl, Digispeaker
	8
	9	#include <linux/module.h>
	10	#include <linux/dma-mapping.h>
	11	#include <linux/slab.h>
	12	#include <linux/of.h>
	13	#include <linux/of_address.h>
	14	#include <linux/of_irq.h>
	15	#include <linux/platform_device.h>
	16
	17	#include <sound/soc.h>
	18
	19	#include <linux/fsl/bestcomm/bestcomm.h>
	20	#include <linux/fsl/bestcomm/gen_bd.h>
	21	#include <asm/mpc52xx_psc.h>
	22
	23	#include "mpc5200_dma.h"
	24
	25	#define DRV_NAME "mpc5200_dma"
	26
	27	/*
	28	* Interrupt handlers
	29	*/
	30	static irqreturn_t psc_dma_status_irq(int irq, void *_psc_dma)
	31	{
	32	struct psc_dma *psc_dma = _psc_dma;
	33	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
	34	u16 isr;
	35
	36	isr = in_be16(&regs->mpc52xx_psc_isr);
	37
	38	/* Playback underrun error */
	39	if (psc_dma->playback.active && (isr & MPC52xx_PSC_IMR_TXEMP))
	40	psc_dma->stats.underrun_count++;
	41
	42	/* Capture overrun error */
	43	if (psc_dma->capture.active && (isr & MPC52xx_PSC_IMR_ORERR))
	44	psc_dma->stats.overrun_count++;
	45
	46	out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
	47
	48	return IRQ_HANDLED;
	49	}
	50
	51	/**
	52	* psc_dma_bcom_enqueue_next_buffer - Enqueue another audio buffer
	53	* @s: pointer to stream private data structure
	54	*
	55	* Enqueues another audio period buffer into the bestcomm queue.
	56	*
	57	* Note: The routine must only be called when there is space available in
	58	* the queue. Otherwise the enqueue will fail and the audio ring buffer
	59	* will get out of sync
	60	*/
	61	static void psc_dma_bcom_enqueue_next_buffer(struct psc_dma_stream *s)
	62	{
	63	struct bcom_bd *bd;
	64
	65	/* Prepare and enqueue the next buffer descriptor */
	66	bd = bcom_prepare_next_buffer(s->bcom_task);
	67	bd->status = s->period_bytes;
	68	bd->data[0] = s->runtime->dma_addr + (s->period_next * s->period_bytes);
	69	bcom_submit_next_buffer(s->bcom_task, NULL);
	70
	71	/* Update for next period */
	72	s->period_next = (s->period_next + 1) % s->runtime->periods;
	73	}
	74
	75	/* Bestcomm DMA irq handler */
	76	static irqreturn_t psc_dma_bcom_irq(int irq, void *_psc_dma_stream)
	77	{
	78	struct psc_dma_stream *s = _psc_dma_stream;
	79
	80	spin_lock(&s->psc_dma->lock);
	81	/* For each finished period, dequeue the completed period buffer
	82	* and enqueue a new one in it's place. */
	83	while (bcom_buffer_done(s->bcom_task)) {
	84	bcom_retrieve_buffer(s->bcom_task, NULL, NULL);
	85
	86	s->period_current = (s->period_current+1) % s->runtime->periods;
	87	s->period_count++;
	88
	89	psc_dma_bcom_enqueue_next_buffer(s);
	90	}
	91	spin_unlock(&s->psc_dma->lock);
	92
	93	/* If the stream is active, then also inform the PCM middle layer
	94	* of the period finished event. */
	95	if (s->active)
	96	snd_pcm_period_elapsed(s->stream);
	97
	98	return IRQ_HANDLED;
	99	}
	100
	101	/**
	102	* psc_dma_trigger: start and stop the DMA transfer.
	103	* @component: triggered component
	104	* @substream: triggered substream
	105	* @cmd: triggered command
	106	*
	107	* This function is called by ALSA to start, stop, pause, and resume the DMA
	108	* transfer of data.
	109	*/
	110	static int psc_dma_trigger(struct snd_soc_component *component,
	111	struct snd_pcm_substream *substream, int cmd)
	112	{
	113	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	114	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
	115	struct snd_pcm_runtime *runtime = substream->runtime;
	116	struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma);
	117	struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs;
	118	u16 imr;
	119	unsigned long flags;
	120	int i;
	121
	122	switch (cmd) {
	123	case SNDRV_PCM_TRIGGER_START:
	124	dev_dbg(psc_dma->dev, "START: stream=%i fbits=%u ps=%u #p=%u\n",
	125	substream->pstr->stream, runtime->frame_bits,
	126	(int)runtime->period_size, runtime->periods);
	127	s->period_bytes = frames_to_bytes(runtime,
	128	runtime->period_size);
	129	s->period_next = 0;
	130	s->period_current = 0;
	131	s->active = 1;
	132	s->period_count = 0;
	133	s->runtime = runtime;
	134
	135	/* Fill up the bestcomm bd queue and enable DMA.
	136	* This will begin filling the PSC's fifo.
	137	*/
	138	spin_lock_irqsave(&psc_dma->lock, flags);
	139
	140	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
	141	bcom_gen_bd_rx_reset(s->bcom_task);
	142	else
	143	bcom_gen_bd_tx_reset(s->bcom_task);
	144
	145	for (i = 0; i < runtime->periods; i++)
	146	if (!bcom_queue_full(s->bcom_task))
	147	psc_dma_bcom_enqueue_next_buffer(s);
	148
	149	bcom_enable(s->bcom_task);
	150	spin_unlock_irqrestore(&psc_dma->lock, flags);
	151
	152	out_8(&regs->command, MPC52xx_PSC_RST_ERR_STAT);
	153
	154	break;
	155
	156	case SNDRV_PCM_TRIGGER_STOP:
	157	dev_dbg(psc_dma->dev, "STOP: stream=%i periods_count=%i\n",
	158	substream->pstr->stream, s->period_count);
	159	s->active = 0;
	160
	161	spin_lock_irqsave(&psc_dma->lock, flags);
	162	bcom_disable(s->bcom_task);
	163	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
	164	bcom_gen_bd_rx_reset(s->bcom_task);
	165	else
	166	bcom_gen_bd_tx_reset(s->bcom_task);
	167	spin_unlock_irqrestore(&psc_dma->lock, flags);
	168
	169	break;
	170
	171	default:
	172	dev_dbg(psc_dma->dev, "unhandled trigger: stream=%i cmd=%i\n",
	173	substream->pstr->stream, cmd);
	174	return -EINVAL;
	175	}
	176
	177	/* Update interrupt enable settings */
	178	imr = 0;
	179	if (psc_dma->playback.active)
	180	imr \|= MPC52xx_PSC_IMR_TXEMP;
	181	if (psc_dma->capture.active)
	182	imr \|= MPC52xx_PSC_IMR_ORERR;
	183	out_be16(&regs->isr_imr.imr, psc_dma->imr \| imr);
	184
	185	return 0;
	186	}
	187
	188
	189	/* ---------------------------------------------------------------------
	190	* The PSC DMA 'ASoC platform' driver
	191	*
	192	* Can be referenced by an 'ASoC machine' driver
	193	* This driver only deals with the audio bus; it doesn't have any
	194	* interaction with the attached codec
	195	*/
	196
	197	static const struct snd_pcm_hardware psc_dma_hardware = {
	198	.info = SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_MMAP_VALID \|
	199	SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	200	SNDRV_PCM_INFO_BATCH,
	201	.formats = SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_S16_BE \|
	202	SNDRV_PCM_FMTBIT_S24_BE \| SNDRV_PCM_FMTBIT_S32_BE,
	203	.period_bytes_max = 1024 * 1024,
	204	.period_bytes_min = 32,
	205	.periods_min = 2,
	206	.periods_max = 256,
	207	.buffer_bytes_max = 2 * 1024 * 1024,
	208	.fifo_size = 512,
	209	};
	210
	211	static int psc_dma_open(struct snd_soc_component *component,
	212	struct snd_pcm_substream *substream)
	213	{
	214	struct snd_pcm_runtime *runtime = substream->runtime;
	215	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	216	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
	217	struct psc_dma_stream *s;
	218	int rc;
	219
	220	dev_dbg(psc_dma->dev, "psc_dma_open(substream=%p)\n", substream);
	221
	222	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
	223	s = &psc_dma->capture;
	224	else
	225	s = &psc_dma->playback;
	226
	227	snd_soc_set_runtime_hwparams(substream, &psc_dma_hardware);
	228
	229	rc = snd_pcm_hw_constraint_integer(runtime,
	230	SNDRV_PCM_HW_PARAM_PERIODS);
	231	if (rc < 0) {
	232	dev_err(substream->pcm->card->dev, "invalid buffer size\n");
	233	return rc;
	234	}
	235
	236	s->stream = substream;
	237	return 0;
	238	}
	239
	240	static int psc_dma_close(struct snd_soc_component *component,
	241	struct snd_pcm_substream *substream)
	242	{
	243	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	244	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
	245	struct psc_dma_stream *s;
	246
	247	dev_dbg(psc_dma->dev, "psc_dma_close(substream=%p)\n", substream);
	248
	249	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
	250	s = &psc_dma->capture;
	251	else
	252	s = &psc_dma->playback;
	253
	254	if (!psc_dma->playback.active &&
	255	!psc_dma->capture.active) {
	256
	257	/* Disable all interrupts and reset the PSC */
	258	out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
	259	out_8(&psc_dma->psc_regs->command, 4 << 4); /* reset error */
	260	}
	261	s->stream = NULL;
	262	return 0;
	263	}
	264
	265	static snd_pcm_uframes_t
	266	psc_dma_pointer(struct snd_soc_component *component,
	267	struct snd_pcm_substream *substream)
	268	{
	269	struct snd_soc_pcm_runtime *rtd = snd_soc_substream_to_rtd(substream);
	270	struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(rtd, 0));
	271	struct psc_dma_stream *s;
	272	dma_addr_t count;
	273
	274	if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE)
	275	s = &psc_dma->capture;
	276	else
	277	s = &psc_dma->playback;
	278
	279	count = s->period_current * s->period_bytes;
	280
	281	return bytes_to_frames(substream->runtime, count);
	282	}
	283
	284	static int psc_dma_new(struct snd_soc_component *component,
	285	struct snd_soc_pcm_runtime *rtd)
	286	{
	287	struct snd_card *card = rtd->card->snd_card;
	288	struct snd_soc_dai *dai = snd_soc_rtd_to_cpu(rtd, 0);
	289	struct snd_pcm *pcm = rtd->pcm;
	290	size_t size = psc_dma_hardware.buffer_bytes_max;
	291	int rc;
	292
	293	dev_dbg(component->dev, "psc_dma_new(card=%p, dai=%p, pcm=%p)\n",
	294	card, dai, pcm);
	295
	296	rc = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
	297	if (rc)
	298	return rc;
	299
	300	return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV, card->dev,
	301	size);
	302	}
	303
	304	static const struct snd_soc_component_driver mpc5200_audio_dma_component = {
	305	.name = DRV_NAME,
	306	.open = psc_dma_open,
	307	.close = psc_dma_close,
	308	.pointer = psc_dma_pointer,
	309	.trigger = psc_dma_trigger,
	310	.pcm_construct = psc_dma_new,
	311	};
	312
	313	int mpc5200_audio_dma_create(struct platform_device *op)
	314	{
	315	phys_addr_t fifo;
	316	struct psc_dma *psc_dma;
	317	struct resource res;
	318	int size, irq, rc;
	319	const __be32 *prop;
	320	void __iomem *regs;
	321	int ret;
	322
	323	/* Fetch the registers and IRQ of the PSC */
	324	irq = irq_of_parse_and_map(op->dev.of_node, 0);
	325	if (of_address_to_resource(op->dev.of_node, 0, &res)) {
	326	dev_err(&op->dev, "Missing reg property\n");
	327	return -ENODEV;
	328	}
	329	regs = ioremap(res.start, resource_size(&res));
	330	if (!regs) {
	331	dev_err(&op->dev, "Could not map registers\n");
	332	return -ENODEV;
	333	}
	334
	335	/* Allocate and initialize the driver private data */
	336	psc_dma = kzalloc(sizeof *psc_dma, GFP_KERNEL);
	337	if (!psc_dma) {
	338	ret = -ENOMEM;
	339	goto out_unmap;
	340	}
	341
	342	/* Get the PSC ID */
	343	prop = of_get_property(op->dev.of_node, "cell-index", &size);
	344	if (!prop \|\| size < sizeof *prop) {
	345	ret = -ENODEV;
	346	goto out_free;
	347	}
	348
	349	spin_lock_init(&psc_dma->lock);
	350	mutex_init(&psc_dma->mutex);
	351	psc_dma->id = be32_to_cpu(*prop);
	352	psc_dma->irq = irq;
	353	psc_dma->psc_regs = regs;
	354	psc_dma->fifo_regs = regs + sizeof *psc_dma->psc_regs;
	355	psc_dma->dev = &op->dev;
	356	psc_dma->playback.psc_dma = psc_dma;
	357	psc_dma->capture.psc_dma = psc_dma;
	358	snprintf(psc_dma->name, sizeof(psc_dma->name), "PSC%d", psc_dma->id);
	359
	360	/* Find the address of the fifo data registers and setup the
	361	* DMA tasks */
	362	fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32);
	363	psc_dma->capture.bcom_task =
	364	bcom_psc_gen_bd_rx_init(psc_dma->id, 10, fifo, 512);
	365	psc_dma->playback.bcom_task =
	366	bcom_psc_gen_bd_tx_init(psc_dma->id, 10, fifo);
	367	if (!psc_dma->capture.bcom_task \|\|
	368	!psc_dma->playback.bcom_task) {
	369	dev_err(&op->dev, "Could not allocate bestcomm tasks\n");
	370	ret = -ENODEV;
	371	goto out_free;
	372	}
	373
	374	/* Disable all interrupts and reset the PSC */
	375	out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr);
	376	/* reset receiver */
	377	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_RX);
	378	/* reset transmitter */
	379	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_TX);
	380	/* reset error */
	381	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_RST_ERR_STAT);
	382	/* reset mode */
	383	out_8(&psc_dma->psc_regs->command, MPC52xx_PSC_SEL_MODE_REG_1);
	384
	385	/* Set up mode register;
	386	* First write: RxRdy (FIFO Alarm) generates rx FIFO irq
	387	* Second write: register Normal mode for non loopback
	388	*/
	389	out_8(&psc_dma->psc_regs->mode, 0);
	390	out_8(&psc_dma->psc_regs->mode, 0);
	391
	392	/* Set the TX and RX fifo alarm thresholds */
	393	out_be16(&psc_dma->fifo_regs->rfalarm, 0x100);
	394	out_8(&psc_dma->fifo_regs->rfcntl, 0x4);
	395	out_be16(&psc_dma->fifo_regs->tfalarm, 0x100);
	396	out_8(&psc_dma->fifo_regs->tfcntl, 0x7);
	397
	398	/* Lookup the IRQ numbers */
	399	psc_dma->playback.irq =
	400	bcom_get_task_irq(psc_dma->playback.bcom_task);
	401	psc_dma->capture.irq =
	402	bcom_get_task_irq(psc_dma->capture.bcom_task);
	403
	404	rc = request_irq(psc_dma->irq, &psc_dma_status_irq, IRQF_SHARED,
	405	"psc-dma-status", psc_dma);
	406	rc \|= request_irq(psc_dma->capture.irq, &psc_dma_bcom_irq, IRQF_SHARED,
	407	"psc-dma-capture", &psc_dma->capture);
	408	rc \|= request_irq(psc_dma->playback.irq, &psc_dma_bcom_irq, IRQF_SHARED,
	409	"psc-dma-playback", &psc_dma->playback);
	410	if (rc) {
	411	ret = -ENODEV;
	412	goto out_irq;
	413	}
	414
	415	/* Save what we've done so it can be found again later */
	416	dev_set_drvdata(&op->dev, psc_dma);
	417
	418	/* Tell the ASoC OF helpers about it */
	419	return devm_snd_soc_register_component(&op->dev,
	420	&mpc5200_audio_dma_component, NULL, 0);
	421	out_irq:
	422	free_irq(psc_dma->irq, psc_dma);
	423	free_irq(psc_dma->capture.irq, &psc_dma->capture);
	424	free_irq(psc_dma->playback.irq, &psc_dma->playback);
	425	out_free:
	426	kfree(psc_dma);
	427	out_unmap:
	428	iounmap(regs);
	429	return ret;
	430	}
	431	EXPORT_SYMBOL_GPL(mpc5200_audio_dma_create);
	432
	433	int mpc5200_audio_dma_destroy(struct platform_device *op)
	434	{
	435	struct psc_dma *psc_dma = dev_get_drvdata(&op->dev);
	436
	437	dev_dbg(&op->dev, "mpc5200_audio_dma_destroy()\n");
	438
	439	bcom_gen_bd_rx_release(psc_dma->capture.bcom_task);
	440	bcom_gen_bd_tx_release(psc_dma->playback.bcom_task);
	441
	442	/* Release irqs */
	443	free_irq(psc_dma->irq, psc_dma);
	444	free_irq(psc_dma->capture.irq, &psc_dma->capture);
	445	free_irq(psc_dma->playback.irq, &psc_dma->playback);
	446
	447	iounmap(psc_dma->psc_regs);
	448	kfree(psc_dma);
	449	dev_set_drvdata(&op->dev, NULL);
	450
	451	return 0;
	452	}
	453	EXPORT_SYMBOL_GPL(mpc5200_audio_dma_destroy);
	454
	455	MODULE_AUTHOR("Grant Likely <grant.likely@secretlab.ca>");
	456	MODULE_DESCRIPTION("Freescale MPC5200 PSC in DMA mode ASoC Driver");
	457	MODULE_LICENSE("GPL");