sound/soc/kirkwood/kirkwood-dma.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * kirkwood-dma.c
  *
  * (c) 2010 Arnaud Patard <apatard@mandriva.com>
  * (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/dma-mapping.h>
 #include <linux/mbus.h>
 #include <sound/soc.h>
 #include "kirkwood.h"

 static struct kirkwood_dma_data *kirkwood_priv(struct snd_pcm_substream *subs)
 {
 	struct snd_soc_pcm_runtime *soc_runtime = snd_soc_substream_to_rtd(subs);
 	return snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(soc_runtime, 0));
 }

 static const struct snd_pcm_hardware kirkwood_dma_snd_hw = {
 	.info = SNDRV_PCM_INFO_INTERLEAVED |
 		SNDRV_PCM_INFO_MMAP |
 		SNDRV_PCM_INFO_MMAP_VALID |
 		SNDRV_PCM_INFO_BLOCK_TRANSFER |
 		SNDRV_PCM_INFO_PAUSE |
 		SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
 	.buffer_bytes_max	= KIRKWOOD_SND_MAX_BUFFER_BYTES,
 	.period_bytes_min	= KIRKWOOD_SND_MIN_PERIOD_BYTES,
 	.period_bytes_max	= KIRKWOOD_SND_MAX_PERIOD_BYTES,
 	.periods_min		= KIRKWOOD_SND_MIN_PERIODS,
 	.periods_max		= KIRKWOOD_SND_MAX_PERIODS,
 	.fifo_size		= 0,
 };

 static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
 {
 	struct kirkwood_dma_data *priv = dev_id;
 	unsigned long mask, status, cause;

 	mask = readl(priv->io + KIRKWOOD_INT_MASK);
 	status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;

 	cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
 	if (unlikely(cause)) {
 		printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
 				__func__, cause);
 		writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
 	}

 	/* we've enabled only bytes interrupts ... */
 	if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES | \
 			KIRKWOOD_INT_CAUSE_REC_BYTES)) {
 		printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
 			__func__, status);
 		return IRQ_NONE;
 	}

 	/* ack int */
 	writel(status, priv->io + KIRKWOOD_INT_CAUSE);

 	if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
 		snd_pcm_period_elapsed(priv->substream_play);

 	if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
 		snd_pcm_period_elapsed(priv->substream_rec);

 	return IRQ_HANDLED;
 }

 static void
 kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
 			       unsigned long dma,
 			       const struct mbus_dram_target_info *dram)
 {
 	int i;

 	/* First disable and clear windows */
 	writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 	writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));

 	/* try to find matching cs for current dma address */
 	for (i = 0; i < dram->num_cs; i++) {
 		const struct mbus_dram_window *cs = &dram->cs[i];
 		if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
 			writel(cs->base & 0xffff0000,
 				base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
 			writel(((cs->size - 1) & 0xffff0000) |
 				(cs->mbus_attr << 8) |
 				(dram->mbus_dram_target_id << 4) | 1,
 				base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
 		}
 	}
 }

 static int kirkwood_dma_open(struct snd_soc_component *component,
 			     struct snd_pcm_substream *substream)
 {
 	int err;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct kirkwood_dma_data *priv = kirkwood_priv(substream);

 	snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);

 	/* Ensure that all constraints linked to dma burst are fulfilled */
 	err = snd_pcm_hw_constraint_minmax(runtime,
 			SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 			priv->burst * 2,
 			KIRKWOOD_AUDIO_BUF_MAX-1);
 	if (err < 0)
 		return err;

 	err = snd_pcm_hw_constraint_step(runtime, 0,
 			SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
 			priv->burst);
 	if (err < 0)
 		return err;

 	err = snd_pcm_hw_constraint_step(substream->runtime, 0,
 			 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
 			 priv->burst);
 	if (err < 0)
 		return err;

 	if (!priv->substream_play && !priv->substream_rec) {
 		err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
 				  "kirkwood-i2s", priv);
 		if (err)
 			return err;

 		/*
 		 * Enable Error interrupts. We're only ack'ing them but
 		 * it's useful for diagnostics
 		 */
 		writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
 	}

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		if (priv->substream_play)
 			return -EBUSY;
 		priv->substream_play = substream;
 	} else {
 		if (priv->substream_rec)
 			return -EBUSY;
 		priv->substream_rec = substream;
 	}

 	return 0;
 }

 static int kirkwood_dma_close(struct snd_soc_component *component,
 			      struct snd_pcm_substream *substream)
 {
 	struct kirkwood_dma_data *priv = kirkwood_priv(substream);

 	if (!priv)
 		return 0;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		priv->substream_play = NULL;
 	else
 		priv->substream_rec = NULL;

 	if (!priv->substream_play && !priv->substream_rec) {
 		writel(0, priv->io + KIRKWOOD_ERR_MASK);
 		free_irq(priv->irq, priv);
 	}

 	return 0;
 }

 static int kirkwood_dma_hw_params(struct snd_soc_component *component,
 				  struct snd_pcm_substream *substream,
 				  struct snd_pcm_hw_params *params)
 {
 	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 	const struct mbus_dram_target_info *dram = mv_mbus_dram_info();
 	unsigned long addr = substream->runtime->dma_addr;

 	if (!dram)
 		return 0;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		kirkwood_dma_conf_mbus_windows(priv->io,
 			KIRKWOOD_PLAYBACK_WIN, addr, dram);
 	else
 		kirkwood_dma_conf_mbus_windows(priv->io,
 			KIRKWOOD_RECORD_WIN, addr, dram);
 	return 0;
 }

 static int kirkwood_dma_prepare(struct snd_soc_component *component,
 				struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 	unsigned long size, count;

 	/* compute buffer size in term of "words" as requested in specs */
 	size = frames_to_bytes(runtime, runtime->buffer_size);
 	size = (size>>2)-1;
 	count = snd_pcm_lib_period_bytes(substream);

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
 		writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
 		writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
 	} else {
 		writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
 		writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
 		writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
 	}


 	return 0;
 }

 static snd_pcm_uframes_t kirkwood_dma_pointer(
 	struct snd_soc_component *component,
 	struct snd_pcm_substream *substream)
 {
 	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
 	snd_pcm_uframes_t count;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		count = bytes_to_frames(substream->runtime,
 			readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
 	else
 		count = bytes_to_frames(substream->runtime,
 			readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));

 	return count;
 }

 static int kirkwood_dma_new(struct snd_soc_component *component,
 			    struct snd_soc_pcm_runtime *rtd)
 {
 	size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
 	struct snd_card *card = rtd->card->snd_card;
 	int ret;

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

 	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
 				       card->dev, size, size);

 	return 0;
 }

 const struct snd_soc_component_driver kirkwood_soc_component = {
 	.name		= DRV_NAME,
 	.open		= kirkwood_dma_open,
 	.close		= kirkwood_dma_close,
 	.hw_params	= kirkwood_dma_hw_params,
 	.prepare	= kirkwood_dma_prepare,
 	.pointer	= kirkwood_dma_pointer,
 	.pcm_construct	= kirkwood_dma_new,
 };
	// SPDX-License-Identifier: GPL-2.0-or-later
	/*
	* kirkwood-dma.c
	*
	* (c) 2010 Arnaud Patard <apatard@mandriva.com>
	* (c) 2010 Arnaud Patard <arnaud.patard@rtp-net.org>
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/device.h>
	#include <linux/io.h>
	#include <linux/slab.h>
	#include <linux/interrupt.h>
	#include <linux/dma-mapping.h>
	#include <linux/mbus.h>
	#include <sound/soc.h>
	#include "kirkwood.h"

	static struct kirkwood_dma_data kirkwood_priv(struct snd_pcm_substream subs)
	{
	struct snd_soc_pcm_runtime *soc_runtime = snd_soc_substream_to_rtd(subs);
	return snd_soc_dai_get_drvdata(snd_soc_rtd_to_cpu(soc_runtime, 0));
	}

	static const struct snd_pcm_hardware kirkwood_dma_snd_hw = {
	.info = SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	SNDRV_PCM_INFO_PAUSE \|
	SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
	.buffer_bytes_max = KIRKWOOD_SND_MAX_BUFFER_BYTES,
	.period_bytes_min = KIRKWOOD_SND_MIN_PERIOD_BYTES,
	.period_bytes_max = KIRKWOOD_SND_MAX_PERIOD_BYTES,
	.periods_min = KIRKWOOD_SND_MIN_PERIODS,
	.periods_max = KIRKWOOD_SND_MAX_PERIODS,
	.fifo_size = 0,
	};

	static irqreturn_t kirkwood_dma_irq(int irq, void *dev_id)
	{
	struct kirkwood_dma_data *priv = dev_id;
	unsigned long mask, status, cause;

	mask = readl(priv->io + KIRKWOOD_INT_MASK);
	status = readl(priv->io + KIRKWOOD_INT_CAUSE) & mask;

	cause = readl(priv->io + KIRKWOOD_ERR_CAUSE);
	if (unlikely(cause)) {
	printk(KERN_WARNING "%s: got err interrupt 0x%lx\n",
	__func__, cause);
	writel(cause, priv->io + KIRKWOOD_ERR_CAUSE);
	}

	/* we've enabled only bytes interrupts ... */
	if (status & ~(KIRKWOOD_INT_CAUSE_PLAY_BYTES \| \
	KIRKWOOD_INT_CAUSE_REC_BYTES)) {
	printk(KERN_WARNING "%s: unexpected interrupt %lx\n",
	__func__, status);
	return IRQ_NONE;
	}

	/* ack int */
	writel(status, priv->io + KIRKWOOD_INT_CAUSE);

	if (status & KIRKWOOD_INT_CAUSE_PLAY_BYTES)
	snd_pcm_period_elapsed(priv->substream_play);

	if (status & KIRKWOOD_INT_CAUSE_REC_BYTES)
	snd_pcm_period_elapsed(priv->substream_rec);

	return IRQ_HANDLED;
	}

	static void
	kirkwood_dma_conf_mbus_windows(void __iomem *base, int win,
	unsigned long dma,
	const struct mbus_dram_target_info *dram)
	{
	int i;

	/* First disable and clear windows */
	writel(0, base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
	writel(0, base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));

	/* try to find matching cs for current dma address */
	for (i = 0; i < dram->num_cs; i++) {
	const struct mbus_dram_window *cs = &dram->cs[i];
	if ((cs->base & 0xffff0000) < (dma & 0xffff0000)) {
	writel(cs->base & 0xffff0000,
	base + KIRKWOOD_AUDIO_WIN_BASE_REG(win));
	writel(((cs->size - 1) & 0xffff0000) \|
	(cs->mbus_attr << 8) \|
	(dram->mbus_dram_target_id << 4) \| 1,
	base + KIRKWOOD_AUDIO_WIN_CTRL_REG(win));
	}
	}
	}

	static int kirkwood_dma_open(struct snd_soc_component *component,
	struct snd_pcm_substream *substream)
	{
	int err;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct kirkwood_dma_data *priv = kirkwood_priv(substream);

	snd_soc_set_runtime_hwparams(substream, &kirkwood_dma_snd_hw);

	/* Ensure that all constraints linked to dma burst are fulfilled */
	err = snd_pcm_hw_constraint_minmax(runtime,
	SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	priv->burst * 2,
	KIRKWOOD_AUDIO_BUF_MAX-1);
	if (err < 0)
	return err;

	err = snd_pcm_hw_constraint_step(runtime, 0,
	SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
	priv->burst);
	if (err < 0)
	return err;

	err = snd_pcm_hw_constraint_step(substream->runtime, 0,
	SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
	priv->burst);
	if (err < 0)
	return err;

	if (!priv->substream_play && !priv->substream_rec) {
	err = request_irq(priv->irq, kirkwood_dma_irq, IRQF_SHARED,
	"kirkwood-i2s", priv);
	if (err)
	return err;

	/*
	* Enable Error interrupts. We're only ack'ing them but
	* it's useful for diagnostics
	*/
	writel((unsigned int)-1, priv->io + KIRKWOOD_ERR_MASK);
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	if (priv->substream_play)
	return -EBUSY;
	priv->substream_play = substream;
	} else {
	if (priv->substream_rec)
	return -EBUSY;
	priv->substream_rec = substream;
	}

	return 0;
	}

	static int kirkwood_dma_close(struct snd_soc_component *component,
	struct snd_pcm_substream *substream)
	{
	struct kirkwood_dma_data *priv = kirkwood_priv(substream);

	if (!priv)
	return 0;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	priv->substream_play = NULL;
	else
	priv->substream_rec = NULL;

	if (!priv->substream_play && !priv->substream_rec) {
	writel(0, priv->io + KIRKWOOD_ERR_MASK);
	free_irq(priv->irq, priv);
	}

	return 0;
	}

	static int kirkwood_dma_hw_params(struct snd_soc_component *component,
	struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
	const struct mbus_dram_target_info *dram = mv_mbus_dram_info();
	unsigned long addr = substream->runtime->dma_addr;

	if (!dram)
	return 0;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	kirkwood_dma_conf_mbus_windows(priv->io,
	KIRKWOOD_PLAYBACK_WIN, addr, dram);
	else
	kirkwood_dma_conf_mbus_windows(priv->io,
	KIRKWOOD_RECORD_WIN, addr, dram);
	return 0;
	}

	static int kirkwood_dma_prepare(struct snd_soc_component *component,
	struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
	unsigned long size, count;

	/* compute buffer size in term of "words" as requested in specs */
	size = frames_to_bytes(runtime, runtime->buffer_size);
	size = (size>>2)-1;
	count = snd_pcm_lib_period_bytes(substream);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	writel(count, priv->io + KIRKWOOD_PLAY_BYTE_INT_COUNT);
	writel(runtime->dma_addr, priv->io + KIRKWOOD_PLAY_BUF_ADDR);
	writel(size, priv->io + KIRKWOOD_PLAY_BUF_SIZE);
	} else {
	writel(count, priv->io + KIRKWOOD_REC_BYTE_INT_COUNT);
	writel(runtime->dma_addr, priv->io + KIRKWOOD_REC_BUF_ADDR);
	writel(size, priv->io + KIRKWOOD_REC_BUF_SIZE);
	}


	return 0;
	}

	static snd_pcm_uframes_t kirkwood_dma_pointer(
	struct snd_soc_component *component,
	struct snd_pcm_substream *substream)
	{
	struct kirkwood_dma_data *priv = kirkwood_priv(substream);
	snd_pcm_uframes_t count;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	count = bytes_to_frames(substream->runtime,
	readl(priv->io + KIRKWOOD_PLAY_BYTE_COUNT));
	else
	count = bytes_to_frames(substream->runtime,
	readl(priv->io + KIRKWOOD_REC_BYTE_COUNT));

	return count;
	}

	static int kirkwood_dma_new(struct snd_soc_component *component,
	struct snd_soc_pcm_runtime *rtd)
	{
	size_t size = kirkwood_dma_snd_hw.buffer_bytes_max;
	struct snd_card *card = rtd->card->snd_card;
	int ret;

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

	snd_pcm_set_managed_buffer_all(rtd->pcm, SNDRV_DMA_TYPE_DEV,
	card->dev, size, size);

	return 0;
	}

	const struct snd_soc_component_driver kirkwood_soc_component = {
	.name = DRV_NAME,
	.open = kirkwood_dma_open,
	.close = kirkwood_dma_close,
	.hw_params = kirkwood_dma_hw_params,
	.prepare = kirkwood_dma_prepare,
	.pointer = kirkwood_dma_pointer,
	.pcm_construct = kirkwood_dma_new,
	};