ASoC: Alchemy AC97C/I2SC audio support (b3c70c9e) · Commits · e / devices / android_kernel_xiaomi_nabu

sound/soc/au1x/Kconfig

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Original line number	Diff line number	Diff line
		@@ -18,6 +18,25 @@ config SND_SOC_AU1XPSC_AC97
		select SND_AC97_CODEC
		select SND_SOC_AC97_BUS

		##
		## Au1000/1500/1100 DMA + AC97C/I2SC
		##
		config SND_SOC_AU1XAUDIO
		tristate "SoC Audio for Au1000/Au1500/Au1100"
		depends on MIPS_ALCHEMY
		help
		This is a driver set for the AC97 unit and the
		old DMA controller as found on the Au1000/Au1500/Au1100 chips.

		config SND_SOC_AU1XAC97C
		tristate
		select AC97_BUS
		select SND_AC97_CODEC
		select SND_SOC_AC97_BUS

		config SND_SOC_AU1XI2SC
		tristate


		##
		## Boards

sound/soc/au1x/Makefile

+8 −0

Original line number	Diff line number	Diff line
		@@ -3,9 +3,17 @@ snd-soc-au1xpsc-dbdma-objs := dbdma2.o
		snd-soc-au1xpsc-i2s-objs := psc-i2s.o
		snd-soc-au1xpsc-ac97-objs := psc-ac97.o

		# Au1000/1500/1100 Audio units
		snd-soc-au1x-dma-objs := dma.o
		snd-soc-au1x-ac97c-objs := ac97c.o
		snd-soc-au1x-i2sc-objs := i2sc.o

		obj-$(CONFIG_SND_SOC_AU1XPSC) += snd-soc-au1xpsc-dbdma.o
		obj-$(CONFIG_SND_SOC_AU1XPSC_I2S) += snd-soc-au1xpsc-i2s.o
		obj-$(CONFIG_SND_SOC_AU1XPSC_AC97) += snd-soc-au1xpsc-ac97.o
		obj-$(CONFIG_SND_SOC_AU1XAUDIO) += snd-soc-au1x-dma.o
		obj-$(CONFIG_SND_SOC_AU1XAC97C) += snd-soc-au1x-ac97c.o
		obj-$(CONFIG_SND_SOC_AU1XI2SC) += snd-soc-au1x-i2sc.o

		# Boards
		snd-soc-db1200-objs := db1200.o

sound/soc/au1x/ac97c.c

0 → 100644

+365 −0

Original line number	Diff line number	Diff line
		/*
		* Au1000/Au1500/Au1100 AC97C controller driver for ASoC
		*
		* (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
		*
		* based on the old ALSA driver originally written by
		* Charles Eidsness <charles@cooper-street.com>
		*/

		#include <linux/init.h>
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/device.h>
		#include <linux/delay.h>
		#include <linux/mutex.h>
		#include <linux/platform_device.h>
		#include <linux/suspend.h>
		#include <sound/core.h>
		#include <sound/pcm.h>
		#include <sound/initval.h>
		#include <sound/soc.h>
		#include <asm/mach-au1x00/au1000.h>

		#include "psc.h"

		/* register offsets and bits */
		#define AC97_CONFIG 0x00
		#define AC97_STATUS 0x04
		#define AC97_DATA 0x08
		#define AC97_CMDRESP 0x0c
		#define AC97_ENABLE 0x10

		#define CFG_RC(x) (((x) & 0x3ff) << 13) /* valid rx slots mask */
		#define CFG_XS(x) (((x) & 0x3ff) << 3) /* valid tx slots mask */
		#define CFG_SG (1 << 2) /* sync gate */
		#define CFG_SN (1 << 1) /* sync control */
		#define CFG_RS (1 << 0) /* acrst# control */
		#define STAT_XU (1 << 11) /* tx underflow */
		#define STAT_XO (1 << 10) /* tx overflow */
		#define STAT_RU (1 << 9) /* rx underflow */
		#define STAT_RO (1 << 8) /* rx overflow */
		#define STAT_RD (1 << 7) /* codec ready */
		#define STAT_CP (1 << 6) /* command pending */
		#define STAT_TE (1 << 4) /* tx fifo empty */
		#define STAT_TF (1 << 3) /* tx fifo full */
		#define STAT_RE (1 << 1) /* rx fifo empty */
		#define STAT_RF (1 << 0) /* rx fifo full */
		#define CMD_SET_DATA(x) (((x) & 0xffff) << 16)
		#define CMD_GET_DATA(x) ((x) & 0xffff)
		#define CMD_READ (1 << 7)
		#define CMD_WRITE (0 << 7)
		#define CMD_IDX(x) ((x) & 0x7f)
		#define EN_D (1 << 1) /* DISable bit */
		#define EN_CE (1 << 0) /* clock enable bit */

		/* how often to retry failed codec register reads/writes */
		#define AC97_RW_RETRIES 5

		#define AC97_RATES \
		SNDRV_PCM_RATE_CONTINUOUS

		#define AC97_FMTS \
		(SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S16_BE)

		/* instance data. There can be only one, MacLeod!!!!, fortunately there IS only
		* once AC97C on early Alchemy chips. The newer ones aren't so lucky.
		*/
		static struct au1xpsc_audio_data *ac97c_workdata;
		#define ac97_to_ctx(x) ac97c_workdata

		static inline unsigned long RD(struct au1xpsc_audio_data *ctx, int reg)
		{
		return __raw_readl(ctx->mmio + reg);
		}

		static inline void WR(struct au1xpsc_audio_data *ctx, int reg, unsigned long v)
		{
		__raw_writel(v, ctx->mmio + reg);
		wmb();
		}

		static unsigned short au1xac97c_ac97_read(struct snd_ac97 *ac97,
		unsigned short r)
		{
		struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
		unsigned int tmo, retry;
		unsigned long data;

		data = ~0;
		retry = AC97_RW_RETRIES;
		do {
		mutex_lock(&ctx->lock);

		tmo = 5;
		while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--)
		udelay(21); /* wait an ac97 frame time */
		if (!tmo) {
		pr_debug("ac97rd timeout #1\n");
		goto next;
		}

		WR(ctx, AC97_CMDRESP, CMD_IDX(r) \| CMD_READ);

		/* stupid errata: data is only valid for 21us, so
		* poll, Forrest, poll...
		*/
		tmo = 0x10000;
		while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--)
		asm volatile ("nop");
		data = RD(ctx, AC97_CMDRESP);

		if (!tmo)
		pr_debug("ac97rd timeout #2\n");

		next:
		mutex_unlock(&ctx->lock);
		} while (--retry && !tmo);

		pr_debug("AC97RD %04x %04lx %d\n", r, data, retry);

		return retry ? data & 0xffff : 0xffff;
		}

		static void au1xac97c_ac97_write(struct snd_ac97 *ac97, unsigned short r,
		unsigned short v)
		{
		struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
		unsigned int tmo, retry;

		retry = AC97_RW_RETRIES;
		do {
		mutex_lock(&ctx->lock);

		for (tmo = 5; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--)
		udelay(21);
		if (!tmo) {
		pr_debug("ac97wr timeout #1\n");
		goto next;
		}

		WR(ctx, AC97_CMDRESP, CMD_WRITE \| CMD_IDX(r) \| CMD_SET_DATA(v));

		for (tmo = 10; (RD(ctx, AC97_STATUS) & STAT_CP) && tmo; tmo--)
		udelay(21);
		if (!tmo)
		pr_debug("ac97wr timeout #2\n");
		next:
		mutex_unlock(&ctx->lock);
		} while (--retry && !tmo);

		pr_debug("AC97WR %04x %04x %d\n", r, v, retry);
		}

		static void au1xac97c_ac97_warm_reset(struct snd_ac97 *ac97)
		{
		struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);

		WR(ctx, AC97_CONFIG, ctx->cfg \| CFG_SG \| CFG_SN);
		msleep(20);
		WR(ctx, AC97_CONFIG, ctx->cfg \| CFG_SG);
		WR(ctx, AC97_CONFIG, ctx->cfg);
		}

		static void au1xac97c_ac97_cold_reset(struct snd_ac97 *ac97)
		{
		struct au1xpsc_audio_data *ctx = ac97_to_ctx(ac97);
		int i;

		WR(ctx, AC97_CONFIG, ctx->cfg \| CFG_RS);
		msleep(500);
		WR(ctx, AC97_CONFIG, ctx->cfg);

		/* wait for codec ready */
		i = 50;
		while (((RD(ctx, AC97_STATUS) & STAT_RD) == 0) && --i)
		msleep(20);
		if (!i)
		printk(KERN_ERR "ac97c: codec not ready after cold reset\n");
		}

		/* AC97 controller operations */
		struct snd_ac97_bus_ops soc_ac97_ops = {
		.read = au1xac97c_ac97_read,
		.write = au1xac97c_ac97_write,
		.reset = au1xac97c_ac97_cold_reset,
		.warm_reset = au1xac97c_ac97_warm_reset,
		};
		EXPORT_SYMBOL_GPL(soc_ac97_ops); /* globals be gone! */

		static int alchemy_ac97c_startup(struct snd_pcm_substream *substream,
		struct snd_soc_dai *dai)
		{
		struct au1xpsc_audio_data *ctx = snd_soc_dai_get_drvdata(dai);
		snd_soc_dai_set_dma_data(dai, substream, &ctx->dmaids[0]);
		return 0;
		}

		static struct snd_soc_dai_ops alchemy_ac97c_ops = {
		.startup = alchemy_ac97c_startup,
		};

		static int au1xac97c_dai_probe(struct snd_soc_dai *dai)
		{
		return ac97c_workdata ? 0 : -ENODEV;
		}

		static struct snd_soc_dai_driver au1xac97c_dai_driver = {
		.name = "alchemy-ac97c",
		.ac97_control = 1,
		.probe = au1xac97c_dai_probe,
		.playback = {
		.rates = AC97_RATES,
		.formats = AC97_FMTS,
		.channels_min = 2,
		.channels_max = 2,
		},
		.capture = {
		.rates = AC97_RATES,
		.formats = AC97_FMTS,
		.channels_min = 2,
		.channels_max = 2,
		},
		.ops = &alchemy_ac97c_ops,
		};

		static int __devinit au1xac97c_drvprobe(struct platform_device *pdev)
		{
		int ret;
		struct resource *r;
		struct au1xpsc_audio_data *ctx;

		ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
		if (!ctx)
		return -ENOMEM;

		mutex_init(&ctx->lock);

		r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!r) {
		ret = -ENODEV;
		goto out0;
		}

		ret = -EBUSY;
		if (!request_mem_region(r->start, resource_size(r), pdev->name))
		goto out0;

		ctx->mmio = ioremap_nocache(r->start, resource_size(r));
		if (!ctx->mmio)
		goto out1;

		r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
		if (!r)
		goto out1;
		ctx->dmaids[SNDRV_PCM_STREAM_PLAYBACK] = r->start;

		r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
		if (!r)
		goto out1;
		ctx->dmaids[SNDRV_PCM_STREAM_CAPTURE] = r->start;

		/* switch it on */
		WR(ctx, AC97_ENABLE, EN_D \| EN_CE);
		WR(ctx, AC97_ENABLE, EN_CE);

		ctx->cfg = CFG_RC(3) \| CFG_XS(3);
		WR(ctx, AC97_CONFIG, ctx->cfg);

		platform_set_drvdata(pdev, ctx);

		ret = snd_soc_register_dai(&pdev->dev, &au1xac97c_dai_driver);
		if (ret)
		goto out1;

		ac97c_workdata = ctx;
		return 0;


		snd_soc_unregister_dai(&pdev->dev);
		out1:
		release_mem_region(r->start, resource_size(r));
		out0:
		kfree(ctx);
		return ret;
		}

		static int __devexit au1xac97c_drvremove(struct platform_device *pdev)
		{
		struct au1xpsc_audio_data *ctx = platform_get_drvdata(pdev);
		struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);

		snd_soc_unregister_dai(&pdev->dev);

		WR(ctx, AC97_ENABLE, EN_D); /* clock off, disable */

		iounmap(ctx->mmio);
		release_mem_region(r->start, resource_size(r));
		kfree(ctx);

		ac97c_workdata = NULL; /* MDEV */

		return 0;
		}

		#ifdef CONFIG_PM
		static int au1xac97c_drvsuspend(struct device *dev)
		{
		struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev);

		WR(ctx, AC97_ENABLE, EN_D); /* clock off, disable */

		return 0;
		}

		static int au1xac97c_drvresume(struct device *dev)
		{
		struct au1xpsc_audio_data *ctx = dev_get_drvdata(dev);

		WR(ctx, AC97_ENABLE, EN_D \| EN_CE);
		WR(ctx, AC97_ENABLE, EN_CE);
		WR(ctx, AC97_CONFIG, ctx->cfg);

		return 0;
		}

		static const struct dev_pm_ops au1xpscac97_pmops = {
		.suspend = au1xac97c_drvsuspend,
		.resume = au1xac97c_drvresume,
		};

		#define AU1XPSCAC97_PMOPS (&au1xpscac97_pmops)

		#else

		#define AU1XPSCAC97_PMOPS NULL

		#endif

		static struct platform_driver au1xac97c_driver = {
		.driver = {
		.name = "alchemy-ac97c",
		.owner = THIS_MODULE,
		.pm = AU1XPSCAC97_PMOPS,
		},
		.probe = au1xac97c_drvprobe,
		.remove = __devexit_p(au1xac97c_drvremove),
		};

		static int __init au1xac97c_load(void)
		{
		ac97c_workdata = NULL;
		return platform_driver_register(&au1xac97c_driver);
		}

		static void __exit au1xac97c_unload(void)
		{
		platform_driver_unregister(&au1xac97c_driver);
		}

		module_init(au1xac97c_load);
		module_exit(au1xac97c_unload);

		MODULE_LICENSE("GPL");
		MODULE_DESCRIPTION("Au1000/1500/1100 AC97C ASoC driver");
		MODULE_AUTHOR("Manuel Lauss");

sound/soc/au1x/dma.c

0 → 100644

+377 −0

Original line number	Diff line number	Diff line
		/*
		* Au1000/Au1500/Au1100 Audio DMA support.
		*
		* (c) 2011 Manuel Lauss <manuel.lauss@googlemail.com>
		*
		* copied almost verbatim from the old ALSA driver, written by
		* Charles Eidsness <charles@cooper-street.com>
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>
		#include <linux/dma-mapping.h>
		#include <sound/core.h>
		#include <sound/pcm.h>
		#include <sound/pcm_params.h>
		#include <sound/soc.h>
		#include <asm/mach-au1x00/au1000.h>
		#include <asm/mach-au1x00/au1000_dma.h>

		#include "psc.h"

		#define ALCHEMY_PCM_FMTS \
		(SNDRV_PCM_FMTBIT_S8 \| SNDRV_PCM_FMTBIT_U8 \| \
		SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S16_BE \| \
		SNDRV_PCM_FMTBIT_U16_LE \| SNDRV_PCM_FMTBIT_U16_BE \| \
		SNDRV_PCM_FMTBIT_S32_LE \| SNDRV_PCM_FMTBIT_S32_BE \| \
		SNDRV_PCM_FMTBIT_U32_LE \| SNDRV_PCM_FMTBIT_U32_BE \| \
		0)

		struct pcm_period {
		u32 start;
		u32 relative_end; /* relative to start of buffer */
		struct pcm_period *next;
		};

		struct audio_stream {
		struct snd_pcm_substream *substream;
		int dma;
		struct pcm_period *buffer;
		unsigned int period_size;
		unsigned int periods;
		};

		struct alchemy_pcm_ctx {
		struct audio_stream stream[2]; /* playback & capture */
		};

		static void au1000_release_dma_link(struct audio_stream *stream)
		{
		struct pcm_period *pointer;
		struct pcm_period *pointer_next;

		stream->period_size = 0;
		stream->periods = 0;
		pointer = stream->buffer;
		if (!pointer)
		return;
		do {
		pointer_next = pointer->next;
		kfree(pointer);
		pointer = pointer_next;
		} while (pointer != stream->buffer);
		stream->buffer = NULL;
		}

		static int au1000_setup_dma_link(struct audio_stream *stream,
		unsigned int period_bytes,
		unsigned int periods)
		{
		struct snd_pcm_substream *substream = stream->substream;
		struct snd_pcm_runtime *runtime = substream->runtime;
		struct pcm_period *pointer;
		unsigned long dma_start;
		int i;

		dma_start = virt_to_phys(runtime->dma_area);

		if (stream->period_size == period_bytes &&
		stream->periods == periods)
		return 0; /* not changed */

		au1000_release_dma_link(stream);

		stream->period_size = period_bytes;
		stream->periods = periods;

		stream->buffer = kmalloc(sizeof(struct pcm_period), GFP_KERNEL);
		if (!stream->buffer)
		return -ENOMEM;
		pointer = stream->buffer;
		for (i = 0; i < periods; i++) {
		pointer->start = (u32)(dma_start + (i * period_bytes));
		pointer->relative_end = (u32) (((i+1) * period_bytes) - 0x1);
		if (i < periods - 1) {
		pointer->next = kmalloc(sizeof(struct pcm_period),
		GFP_KERNEL);
		if (!pointer->next) {
		au1000_release_dma_link(stream);
		return -ENOMEM;
		}
		pointer = pointer->next;
		}
		}
		pointer->next = stream->buffer;
		return 0;
		}

		static void au1000_dma_stop(struct audio_stream *stream)
		{
		if (stream->buffer)
		disable_dma(stream->dma);
		}

		static void au1000_dma_start(struct audio_stream *stream)
		{
		if (!stream->buffer)
		return;

		init_dma(stream->dma);
		if (get_dma_active_buffer(stream->dma) == 0) {
		clear_dma_done0(stream->dma);
		set_dma_addr0(stream->dma, stream->buffer->start);
		set_dma_count0(stream->dma, stream->period_size >> 1);
		set_dma_addr1(stream->dma, stream->buffer->next->start);
		set_dma_count1(stream->dma, stream->period_size >> 1);
		} else {
		clear_dma_done1(stream->dma);
		set_dma_addr1(stream->dma, stream->buffer->start);
		set_dma_count1(stream->dma, stream->period_size >> 1);
		set_dma_addr0(stream->dma, stream->buffer->next->start);
		set_dma_count0(stream->dma, stream->period_size >> 1);
		}
		enable_dma_buffers(stream->dma);
		start_dma(stream->dma);
		}

		static irqreturn_t au1000_dma_interrupt(int irq, void *ptr)
		{
		struct audio_stream stream = (struct audio_stream )ptr;
		struct snd_pcm_substream *substream = stream->substream;

		switch (get_dma_buffer_done(stream->dma)) {
		case DMA_D0:
		stream->buffer = stream->buffer->next;
		clear_dma_done0(stream->dma);
		set_dma_addr0(stream->dma, stream->buffer->next->start);
		set_dma_count0(stream->dma, stream->period_size >> 1);
		enable_dma_buffer0(stream->dma);
		break;
		case DMA_D1:
		stream->buffer = stream->buffer->next;
		clear_dma_done1(stream->dma);
		set_dma_addr1(stream->dma, stream->buffer->next->start);
		set_dma_count1(stream->dma, stream->period_size >> 1);
		enable_dma_buffer1(stream->dma);
		break;
		case (DMA_D0 \| DMA_D1):
		pr_debug("DMA %d missed interrupt.\n", stream->dma);
		au1000_dma_stop(stream);
		au1000_dma_start(stream);
		break;
		case (~DMA_D0 & ~DMA_D1):
		pr_debug("DMA %d empty irq.\n", stream->dma);
		}
		snd_pcm_period_elapsed(substream);
		return IRQ_HANDLED;
		}

		static const struct snd_pcm_hardware alchemy_pcm_hardware = {
		.info = SNDRV_PCM_INFO_MMAP \| SNDRV_PCM_INFO_MMAP_VALID \|
		SNDRV_PCM_INFO_INTERLEAVED \| SNDRV_PCM_INFO_BATCH,
		.formats = ALCHEMY_PCM_FMTS,
		.rates = SNDRV_PCM_RATE_8000_192000,
		.rate_min = SNDRV_PCM_RATE_8000,
		.rate_max = SNDRV_PCM_RATE_192000,
		.channels_min = 2,
		.channels_max = 2,
		.period_bytes_min = 1024,
		.period_bytes_max = 16 * 1024 - 1,
		.periods_min = 4,
		.periods_max = 255,
		.buffer_bytes_max = 128 * 1024,
		.fifo_size = 16,
		};

		static inline struct alchemy_pcm_ctx ss_to_ctx(struct snd_pcm_substream ss)
		{
		struct snd_soc_pcm_runtime *rtd = ss->private_data;
		return snd_soc_platform_get_drvdata(rtd->platform);
		}

		static inline struct audio_stream ss_to_as(struct snd_pcm_substream ss)
		{
		struct alchemy_pcm_ctx *ctx = ss_to_ctx(ss);
		return &(ctx->stream[ss->stream]);
		}

		static int alchemy_pcm_open(struct snd_pcm_substream *substream)
		{
		struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
		struct snd_soc_pcm_runtime *rtd = substream->private_data;
		int *dmaids, s = substream->stream;
		char *name;

		dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
		if (!dmaids)
		return -ENODEV; /* whoa, has ordering changed? */

		/* DMA setup */
		name = (s == SNDRV_PCM_STREAM_PLAYBACK) ? "audio-tx" : "audio-rx";
		ctx->stream[s].dma = request_au1000_dma(dmaids[s], name,
		au1000_dma_interrupt, IRQF_DISABLED,
		&ctx->stream[s]);
		set_dma_mode(ctx->stream[s].dma,
		get_dma_mode(ctx->stream[s].dma) & ~DMA_NC);

		ctx->stream[s].substream = substream;
		ctx->stream[s].buffer = NULL;
		snd_soc_set_runtime_hwparams(substream, &alchemy_pcm_hardware);

		return 0;
		}

		static int alchemy_pcm_close(struct snd_pcm_substream *substream)
		{
		struct alchemy_pcm_ctx *ctx = ss_to_ctx(substream);
		int stype = substream->stream;

		ctx->stream[stype].substream = NULL;
		free_au1000_dma(ctx->stream[stype].dma);

		return 0;
		}

		static int alchemy_pcm_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *hw_params)
		{
		struct audio_stream *stream = ss_to_as(substream);
		int err;

		err = snd_pcm_lib_malloc_pages(substream,
		params_buffer_bytes(hw_params));
		if (err < 0)
		return err;
		err = au1000_setup_dma_link(stream,
		params_period_bytes(hw_params),
		params_periods(hw_params));
		if (err)
		snd_pcm_lib_free_pages(substream);

		return err;
		}

		static int alchemy_pcm_hw_free(struct snd_pcm_substream *substream)
		{
		struct audio_stream *stream = ss_to_as(substream);
		au1000_release_dma_link(stream);
		return snd_pcm_lib_free_pages(substream);
		}

		static int alchemy_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
		{
		struct audio_stream *stream = ss_to_as(substream);
		int err = 0;

		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;
		}
		return err;
		}

		static snd_pcm_uframes_t alchemy_pcm_pointer(struct snd_pcm_substream *ss)
		{
		struct audio_stream *stream = ss_to_as(ss);
		long location;

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

		static struct snd_pcm_ops alchemy_pcm_ops = {
		.open = alchemy_pcm_open,
		.close = alchemy_pcm_close,
		.ioctl = snd_pcm_lib_ioctl,
		.hw_params = alchemy_pcm_hw_params,
		.hw_free = alchemy_pcm_hw_free,
		.trigger = alchemy_pcm_trigger,
		.pointer = alchemy_pcm_pointer,
		};

		static void alchemy_pcm_free_dma_buffers(struct snd_pcm *pcm)
		{
		snd_pcm_lib_preallocate_free_for_all(pcm);
		}

		static int alchemy_pcm_new(struct snd_soc_pcm_runtime *rtd)
		{
		struct snd_pcm *pcm = rtd->pcm;

		snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
		snd_dma_continuous_data(GFP_KERNEL), 65536, (4096 * 1024) - 1);

		return 0;
		}

		struct snd_soc_platform_driver alchemy_pcm_soc_platform = {
		.ops = &alchemy_pcm_ops,
		.pcm_new = alchemy_pcm_new,
		.pcm_free = alchemy_pcm_free_dma_buffers,
		};

		static int __devinit alchemy_pcm_drvprobe(struct platform_device *pdev)
		{
		struct alchemy_pcm_ctx *ctx;
		int ret;

		ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
		if (!ctx)
		return -ENOMEM;

		platform_set_drvdata(pdev, ctx);

		ret = snd_soc_register_platform(&pdev->dev, &alchemy_pcm_soc_platform);
		if (ret)
		kfree(ctx);

		return ret;
		}

		static int __devexit alchemy_pcm_drvremove(struct platform_device *pdev)
		{
		struct alchemy_pcm_ctx *ctx = platform_get_drvdata(pdev);

		snd_soc_unregister_platform(&pdev->dev);
		kfree(ctx);

		return 0;
		}

		static struct platform_driver alchemy_pcmdma_driver = {
		.driver = {
		.name = "alchemy-pcm-dma",
		.owner = THIS_MODULE,
		},
		.probe = alchemy_pcm_drvprobe,
		.remove = __devexit_p(alchemy_pcm_drvremove),
		};

		static int __init alchemy_pcmdma_load(void)
		{
		return platform_driver_register(&alchemy_pcmdma_driver);
		}

		static void __exit alchemy_pcmdma_unload(void)
		{
		platform_driver_unregister(&alchemy_pcmdma_driver);
		}

		module_init(alchemy_pcmdma_load);
		module_exit(alchemy_pcmdma_unload);

		MODULE_LICENSE("GPL");
		MODULE_DESCRIPTION("Au1000/Au1500/Au1100 Audio DMA driver");
		MODULE_AUTHOR("Manuel Lauss");

sound/soc/au1x/i2sc.c

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