[alsa-devel] [PATCH v3 1/5] ASoC: sirf: add sirf platform driver which provides DMA

[RongJun Ying]

From: Rongjun Ying <Rongjun.Ying at csr.com>

this driver uses dmaengine APIs and provides DMA to the CPU DAIs
of I2S, USP and SiRF-soc-inner.
SiRFSoC has 3 audio DAIs: I2S, USP(Universal Serial Ports) and DAI
connected to soc-inner-codec, all of them will use the same DMA
driver here.

Signed-off-by: Rongjun Ying <Rongjun.Ying at csr.com>
---
 -v3:
 Automatically discovering the configuration of pcm hardware from
 the dmaengine driver
 
 sound/soc/Kconfig         |    1 +
 sound/soc/Makefile        |    1 +
 sound/soc/sirf/Kconfig    |    4 ++
 sound/soc/sirf/Makefile   |    3 ++
 sound/soc/sirf/sirf-pcm.c |   68 +++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 77 insertions(+), 0 deletions(-)
 create mode 100644 sound/soc/sirf/Kconfig
 create mode 100644 sound/soc/sirf/Makefile
 create mode 100644 sound/soc/sirf/sirf-pcm.c

diff --git a/sound/soc/Kconfig b/sound/soc/Kconfig
index d62ce48..0060b31 100644
--- a/sound/soc/Kconfig
+++ b/sound/soc/Kconfig
@@ -50,6 +50,7 @@ source "sound/soc/pxa/Kconfig"
 source "sound/soc/samsung/Kconfig"
 source "sound/soc/s6000/Kconfig"
 source "sound/soc/sh/Kconfig"
+source "sound/soc/sirf/Kconfig"
 source "sound/soc/spear/Kconfig"
 source "sound/soc/tegra/Kconfig"
 source "sound/soc/txx9/Kconfig"
diff --git a/sound/soc/Makefile b/sound/soc/Makefile
index 62a1822..5f1df02 100644
--- a/sound/soc/Makefile
+++ b/sound/soc/Makefile
@@ -27,6 +27,7 @@ obj-$(CONFIG_SND_SOC)	+= pxa/
 obj-$(CONFIG_SND_SOC)	+= samsung/
 obj-$(CONFIG_SND_SOC)	+= s6000/
 obj-$(CONFIG_SND_SOC)	+= sh/
+obj-$(CONFIG_SND_SOC)	+= sirf/
 obj-$(CONFIG_SND_SOC)	+= spear/
 obj-$(CONFIG_SND_SOC)	+= tegra/
 obj-$(CONFIG_SND_SOC)	+= txx9/
diff --git a/sound/soc/sirf/Kconfig b/sound/soc/sirf/Kconfig
new file mode 100644
index 0000000..1637089
--- /dev/null
+++ b/sound/soc/sirf/Kconfig
@@ -0,0 +1,4 @@
+config SND_SIRF_SOC
+	tristate "Platform DMA driver for the SiRF SoC chips"
+	depends on ARCH_SIRF && SND_SOC
+	select SND_SOC_GENERIC_DMAENGINE_PCM
diff --git a/sound/soc/sirf/Makefile b/sound/soc/sirf/Makefile
new file mode 100644
index 0000000..f268b83
--- /dev/null
+++ b/sound/soc/sirf/Makefile
@@ -0,0 +1,3 @@
+snd-soc-sirf-objs := sirf-pcm.o
+
+obj-$(CONFIG_SND_SIRF_SOC) += snd-soc-sirf.o
diff --git a/sound/soc/sirf/sirf-pcm.c b/sound/soc/sirf/sirf-pcm.c
new file mode 100644
index 0000000..e4cb3a6
--- /dev/null
+++ b/sound/soc/sirf/sirf-pcm.c
@@ -0,0 +1,68 @@
+/*
+ * ALSA PCM interface for the SiRF SoC
+ *
+ * Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Licensed under GPLv2 or later.
+ */
+
+#include <linux/module.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+static struct dma_chan *sirf_pcm_request_chan(struct snd_soc_pcm_runtime *rtd,
+	struct snd_pcm_substream *substream)
+{
+	struct snd_dmaengine_dai_dma_data *dma_data;
+
+	dma_data = snd_soc_dai_get_dma_data(rtd->cpu_dai, substream);
+
+	return dma_request_slave_channel(rtd->cpu_dai->dev,
+			dma_data->chan_name);
+}
+
+static const struct snd_dmaengine_pcm_config sirf_dmaengine_pcm_config = {
+	.prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
+	.compat_request_channel = sirf_pcm_request_chan,
+};
+
+static int sirf_pcm_probe(struct platform_device *pdev)
+{
+	return devm_snd_dmaengine_pcm_register(&pdev->dev,
+		&sirf_dmaengine_pcm_config,
+		SND_DMAENGINE_PCM_FLAG_NO_DT |
+		SND_DMAENGINE_PCM_FLAG_COMPAT);
+}
+
+static struct platform_driver sirf_pcm_driver = {
+	.driver = {
+		.name = "sirf-pcm-audio",
+		.owner = THIS_MODULE,
+	},
+	.probe = sirf_pcm_probe,
+};
+
+static int __init sirf_pcm_init(void)
+{
+	int ret = 0;
+
+	ret = platform_driver_register(&sirf_pcm_driver);
+	if (ret)
+		pr_err("failed to register platform driver\n");
+	return ret;
+}
+
+static void __exit sirf_pcm_exit(void)
+{
+	platform_driver_unregister(&sirf_pcm_driver);
+}
+
+module_init(sirf_pcm_init);
+module_exit(sirf_pcm_exit);
+
+MODULE_DESCRIPTION("SiRF PCM audio interface driver");
+MODULE_AUTHOR("RongJun Ying <Rongjun.Ying at csr.com>");
+MODULE_LICENSE("GPL v2");
-- 
1.7.5.4