[alsa-devel] [PATCH 1/2] ASoC: au1x: remove automatic DMA device registration from PSC drivers

24 Jul 2011

The PSC audio drivers (psc-ac97/psc-i2s) register the DMA platform_device
on their own.  This is frowned upon, from now on board code must
register a simple pcm dma platform device for each PSC with sound duties.
Signed-off-by: Manuel Lauss manuel.lauss@googlemail.com
---
 arch/mips/alchemy/devboards/db1200/platform.c |    6 ++
 sound/soc/au1x/dbdma2.c                       |   83 ++++---------------------
 sound/soc/au1x/psc-ac97.c                     |   34 +++++++---
 sound/soc/au1x/psc-i2s.c                      |   32 +++++++---
 sound/soc/au1x/psc.h                          |    5 --
 5 files changed, 64 insertions(+), 96 deletions(-)

diff --git a/arch/mips/alchemy/devboards/db1200/platform.c b/arch/mips/alchemy/devboards/db1200/platform.c
index fbb5593..cfb71ae 100644
--- a/arch/mips/alchemy/devboards/db1200/platform.c
+++ b/arch/mips/alchemy/devboards/db1200/platform.c
@@ -434,12 +434,18 @@ static struct platform_device db1200_stac_dev = {
    .id		= 1,	/* on PSC1 */
 };
+static struct platform_device db1200_audiodma_dev = {
+	.name		= "au1xpsc-pcm",
+	.id		= 1,	/* PSC ID */
+};
+
 static struct platform_device *db1200_devs[] __initdata = {
    NULL,		/* PSC0, selected by S6.8 */
    &db1200_ide_dev,
    &db1200_eth_dev,
    &db1200_rtc_dev,
    &db1200_nand_dev,
+	&db1200_audiodma_dev,
    &db1200_audio_dev,
    &db1200_stac_dev,
 };
diff --git a/sound/soc/au1x/dbdma2.c b/sound/soc/au1x/dbdma2.c
index 10fdd28..cc53607 100644
--- a/sound/soc/au1x/dbdma2.c
+++ b/sound/soc/au1x/dbdma2.c
@@ -293,6 +293,16 @@ au1xpsc_pcm_pointer(struct snd_pcm_substream *substream)
static int au1xpsc_pcm_open(struct snd_pcm_substream *substream)
 {
+	struct au1xpsc_audio_dmadata *pcd = to_dmadata(substream);
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	int stype = SUBSTREAM_TYPE(substream), *dmaids;
+
+	dmaids = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+	if (!dmaids)
+		return -ENODEV;	/* whoa, has ordering changed? */
+
+	pcd->ddma_id = dmaids[stype];
+
    snd_soc_set_runtime_hwparams(substream, &au1xpsc_pcm_hardware);
    return 0;
 }
@@ -339,36 +349,18 @@ struct snd_soc_platform_driver au1xpsc_soc_platform = {
 static int __devinit au1xpsc_pcm_drvprobe(struct platform_device *pdev)
 {
    struct au1xpsc_audio_dmadata *dmadata;
-	struct resource *r;
    int ret;
dmadata = kzalloc(2 * sizeof(struct au1xpsc_audio_dmadata), GFP_KERNEL);
    if (!dmadata)
    	return -ENOMEM;
-	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!r) {
-		ret = -ENODEV;
-		goto out1;
-	}
-	dmadata[PCM_TX].ddma_id = r->start;
-
-	/* RX DMA */
-	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
-	if (!r) {
-		ret = -ENODEV;
-		goto out1;
-	}
-	dmadata[PCM_RX].ddma_id = r->start;
-
    platform_set_drvdata(pdev, dmadata);
ret = snd_soc_register_platform(&pdev->dev, &au1xpsc_soc_platform);
-	if (!ret)
-		return ret;
+	if (ret)
+		kfree(dmadata);
-out1:
-	kfree(dmadata);
    return ret;
 }
@@ -404,57 +396,6 @@ static void __exit au1xpsc_audio_dbdma_unload(void)
 module_init(au1xpsc_audio_dbdma_load);
 module_exit(au1xpsc_audio_dbdma_unload);
-
-struct platform_device *au1xpsc_pcm_add(struct platform_device *pdev)
-{
-	struct resource *res, *r;
-	struct platform_device *pd;
-	int id[2];
-	int ret;
-
-	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
-	if (!r)
-		return NULL;
-	id[0] = r->start;
-
-	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
-	if (!r)
-		return NULL;
-	id[1] = r->start;
-
-	res = kzalloc(sizeof(struct resource) * 2, GFP_KERNEL);
-	if (!res)
-		return NULL;
-
-	res[0].start = res[0].end = id[0];
-	res[1].start = res[1].end = id[1];
-	res[0].flags = res[1].flags = IORESOURCE_DMA;
-
-	pd = platform_device_alloc("au1xpsc-pcm", pdev->id);
-	if (!pd)
-		goto out;
-
-	pd->resource = res;
-	pd->num_resources = 2;
-
-	ret = platform_device_add(pd);
-	if (!ret)
-		return pd;
-
-	platform_device_put(pd);
-out:
-	kfree(res);
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(au1xpsc_pcm_add);
-
-void au1xpsc_pcm_destroy(struct platform_device *dmapd)
-{
-	if (dmapd)
-		platform_device_unregister(dmapd);
-}
-EXPORT_SYMBOL_GPL(au1xpsc_pcm_destroy);
-
 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Au12x0/Au1550 PSC Audio DMA driver");
 MODULE_AUTHOR("Manuel Lauss");
diff --git a/sound/soc/au1x/psc-ac97.c b/sound/soc/au1x/psc-ac97.c
index d0db66f..44296ab 100644
--- a/sound/soc/au1x/psc-ac97.c
+++ b/sound/soc/au1x/psc-ac97.c
@@ -324,12 +324,21 @@ static int au1xpsc_ac97_trigger(struct snd_pcm_substream *substream,
    return ret;
 }
+static int au1xpsc_ac97_startup(struct snd_pcm_substream *substream,
+				struct snd_soc_dai *dai)
+{
+	struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
+	snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]);
+	return 0;
+}
+
 static int au1xpsc_ac97_probe(struct snd_soc_dai *dai)
 {
    return au1xpsc_ac97_workdata ? 0 : -ENODEV;
 }
static struct snd_soc_dai_ops au1xpsc_ac97_dai_ops = {
+	.startup	= au1xpsc_ac97_startup,
    .trigger	= au1xpsc_ac97_trigger,
    .hw_params	= au1xpsc_ac97_hw_params,
 };
@@ -379,6 +388,16 @@ static int __devinit au1xpsc_ac97_drvprobe(struct platform_device *pdev)
    if (!wd->mmio)
    	goto out1;
+	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+	if (!r)
+		goto out2;
+	wd->dmaids[PCM_TX] = r->start;
+
+	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+	if (!r)
+		goto out2;
+	wd->dmaids[PCM_RX] = r->start;
+
    /* configuration: max dma trigger threshold, enable ac97 */
    wd->cfg = PSC_AC97CFG_RT_FIFO8 | PSC_AC97CFG_TT_FIFO8 |
    	  PSC_AC97CFG_DE_ENABLE;
@@ -401,15 +420,13 @@ static int __devinit au1xpsc_ac97_drvprobe(struct platform_device *pdev)
ret = snd_soc_register_dai(&pdev->dev, &wd->dai_drv);
    if (ret)
-		goto out1;
+		goto out2;
-	wd->dmapd = au1xpsc_pcm_add(pdev);
-	if (wd->dmapd) {
-		au1xpsc_ac97_workdata = wd;
-		return 0;
-	}
+	au1xpsc_ac97_workdata = wd;
+	return 0;
-	snd_soc_unregister_dai(&pdev->dev);
+out2:
+	iounmap(wd->mmio);
 out1:
    release_mem_region(r->start, resource_size(r));
 out0:
@@ -422,9 +439,6 @@ static int __devexit au1xpsc_ac97_drvremove(struct platform_device *pdev)
    struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
    struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (wd->dmapd)
-		au1xpsc_pcm_destroy(wd->dmapd);
-
    snd_soc_unregister_dai(&pdev->dev);
/* disable PSC completely */
diff --git a/sound/soc/au1x/psc-i2s.c b/sound/soc/au1x/psc-i2s.c
index fca0912..1b7ab5d 100644
--- a/sound/soc/au1x/psc-i2s.c
+++ b/sound/soc/au1x/psc-i2s.c
@@ -257,7 +257,16 @@ static int au1xpsc_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
    return ret;
 }
+static int au1xpsc_i2s_startup(struct snd_pcm_substream *substream,
+			       struct snd_soc_dai *dai)
+{
+	struct au1xpsc_audio_data *pscdata = snd_soc_dai_get_drvdata(dai);
+	snd_soc_dai_set_dma_data(dai, substream, &pscdata->dmaids[0]);
+	return 0;
+}
+
 static struct snd_soc_dai_ops au1xpsc_i2s_dai_ops = {
+	.startup	= au1xpsc_i2s_startup,
    .trigger	= au1xpsc_i2s_trigger,
    .hw_params	= au1xpsc_i2s_hw_params,
    .set_fmt	= au1xpsc_i2s_set_fmt,
@@ -304,6 +313,16 @@ static int __devinit au1xpsc_i2s_drvprobe(struct platform_device *pdev)
    if (!wd->mmio)
    	goto out1;
+	r = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+	if (!r)
+		goto out2;
+	wd->dmaids[PCM_TX] = r->start;
+
+	r = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+	if (!r)
+		goto out2;
+	wd->dmaids[PCM_RX] = r->start;
+
    /* preserve PSC clock source set up by platform (dev.platform_data
     * is already occupied by soc layer)
     */
@@ -330,15 +349,11 @@ static int __devinit au1xpsc_i2s_drvprobe(struct platform_device *pdev)
    platform_set_drvdata(pdev, wd);
ret = snd_soc_register_dai(&pdev->dev, &wd->dai_drv);
-	if (ret)
-		goto out1;
-
-	/* finally add the DMA device for this PSC */
-	wd->dmapd = au1xpsc_pcm_add(pdev);
-	if (wd->dmapd)
+	if (!ret)
    	return 0;
-	snd_soc_unregister_dai(&pdev->dev);
+out2:
+	iounmap(wd->mmio);
 out1:
    release_mem_region(r->start, resource_size(r));
 out0:
@@ -351,9 +366,6 @@ static int __devexit au1xpsc_i2s_drvremove(struct platform_device *pdev)
    struct au1xpsc_audio_data *wd = platform_get_drvdata(pdev);
    struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (wd->dmapd)
-		au1xpsc_pcm_destroy(wd->dmapd);
-
    snd_soc_unregister_dai(&pdev->dev);
au_writel(0, I2S_CFG(wd));
diff --git a/sound/soc/au1x/psc.h b/sound/soc/au1x/psc.h
index c59b9e5..1b21c4f 100644
--- a/sound/soc/au1x/psc.h
+++ b/sound/soc/au1x/psc.h
@@ -19,10 +19,6 @@
 #define SUBSTREAM_TYPE(substream) \
    ((substream)->stream == SNDRV_PCM_STREAM_PLAYBACK ? PCM_TX : PCM_RX)
-/* PSC/DBDMA helpers */
-extern struct platform_device *au1xpsc_pcm_add(struct platform_device *pdev);
-extern void au1xpsc_pcm_destroy(struct platform_device *dmapd);
-
 struct au1xpsc_audio_data {
    void __iomem *mmio;
@@ -34,7 +30,6 @@ struct au1xpsc_audio_data {
    unsigned long pm[2];
    struct mutex lock;
    int dmaids[2];
-	struct platform_device *dmapd;
 };
/* easy access macros */
-- 
1.7.6

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