From: Rongjun Ying <rongjun.ying@xxxxxxx>
The audio modules consist of an internal audio codec, internal
audio port and i2s controller.
These modules sharing same register address space.
sirf-audio.c provides common regmap mmio handling for all audio modules.
The sound drivers will get regmap from sirf audio mfd driver.
Signed-off-by: Rongjun Ying <rongjun.ying@xxxxxxx>
---
-v2:
1. Fixed a lot of english syntax error
2. Add "OF" depend
3. Get codec compatible from child node of dts
4. Use a standard header
drivers/mfd/Kconfig | 10 +++
drivers/mfd/Makefile | 1 +
drivers/mfd/sirf-audio.c | 128 ++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/sirf/audio.h | 22 +++++++
4 files changed, 161 insertions(+), 0 deletions(-)
create mode 100644 drivers/mfd/sirf-audio.c
create mode 100644 include/linux/mfd/sirf/audio.h
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index b7c74a7..d3e79f7 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -546,6 +546,16 @@ config MFD_SI476X_CORE
To compile this driver as a module, choose M here: the
module will be called si476x-core.
+config MFD_SIRF_AUDIO
+ tristate "SiRF Audio modules"
+ depends on ARCH_SIRF && OF
+ select MFD_CORE
+ select REGMAP_MMIO
+ help
+ This is the driver for the SiRF audio modules, which consists of I2S,
+ internal audio codec, internal audio port and AC97. These modules share
+ the same address space. So this MFD driver is used to manage the regmap.
+
config MFD_SM501
tristate "Silicon Motion SM501"
---help---
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 8a28dc9..9182170 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -164,3 +164,4 @@ obj-$(CONFIG_MFD_RETU) += retu-mfd.o
obj-$(CONFIG_MFD_AS3711) += as3711.o
obj-$(CONFIG_MFD_AS3722) += as3722.o
obj-$(CONFIG_MFD_STW481X) += stw481x.o
+obj-$(CONFIG_MFD_SIRF_AUDIO) += sirf-audio.o
diff --git a/drivers/mfd/sirf-audio.c b/drivers/mfd/sirf-audio.c
new file mode 100644
index 0000000..3bcb198
--- /dev/null
+++ b/drivers/mfd/sirf-audio.c
@@ -0,0 +1,128 @@
+/*
+ * airf-audio.c -- Register map share for all SiRF audio modules
+ *
+ * Copyright (c) 2014 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Author: RongJun Ying <rongjun.ying@xxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/sirf/audio.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+static struct mfd_cell sirf_audio_devs[] = {
+ {
+ .name = "sirf-audio-codec",
+ }, {
+ .of_compatible = "sirf,prima2-i2s",
+ .name = "sirf-i2s",
+ }, {
+ .of_compatible = "sirf,audio-port",
+ .name = "sirf-audio-port",
+ }
+};
+
+static const struct regmap_config sirf_audio_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .cache_type = REGCACHE_NONE,
+};
+
+static int sirf_audio_probe(struct platform_device *pdev)
+{
+ struct resource *mem_res;
+ struct sirf_audio_dev *sirf_audio;
+ void __iomem *base;
+ struct regmap *regmap;
+ struct device_node *codec_np;
+ const char *compatible;
+ int cplen;
+ int ret;
+
+ sirf_audio = devm_kzalloc(&pdev->dev, sizeof(*sirf_audio),
+ GFP_KERNEL);
+ if (!sirf_audio)
+ return -ENOMEM;
+
+ mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, mem_res);
+ if (!base)
+ return -ENOMEM;
+
+ regmap = devm_regmap_init_mmio(&pdev->dev, base,
+ &sirf_audio_regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ sirf_audio->regmap = regmap;
+
+ platform_set_drvdata(pdev, sirf_audio);
+
+ codec_np = of_get_child_by_name(pdev->dev.of_node, "audiocodec");
+ if (!codec_np)
+ return -EINVAL;
+
+ compatible = of_get_property(codec_np, "compatible", &cplen);
+ if (!compatible)
+ return -EINVAL;
+
+ /* Overwrite internal codec compatible string */
+ sirf_audio_devs[0].of_compatible = kstrdup(compatible, GFP_KERNEL);
+
+ ret = mfd_add_devices(&pdev->dev, -1, sirf_audio_devs,
+ ARRAY_SIZE(sirf_audio_devs),
+ NULL, 0, NULL);
+ if (ret) {
+ dev_err(&pdev->dev, "add mfd devices failed: %d\n", ret);
+ goto err_add_devs;
+ }
+
+ return 0;
+
+err_add_devs:
+ kfree(sirf_audio_devs[0].of_compatible);
+ return ret;
+}
+
+static int sirf_audio_remove(struct platform_device *pdev)
+{
+ kfree(sirf_audio_devs[0].of_compatible);
+ mfd_remove_devices(&pdev->dev);
+ return 0;
+}
+
+static const struct of_device_id sirf_audio_of_match[] = {
+ { .compatible = "sirf,audio", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, sirf_audio_of_match);
+
+static struct platform_driver sirf_audio_driver = {
+ .driver = {
+ .name = "sirf-audio",
+ .owner = THIS_MODULE,
+ .of_match_table = sirf_audio_of_match,
+ },
+ .probe = sirf_audio_probe,
+ .remove = sirf_audio_remove,
+};
+
+module_platform_driver(sirf_audio_driver);
+
+MODULE_DESCRIPTION("SiRF Audio MFD driver");
+MODULE_AUTHOR("RongJun Ying <Rongjun.Ying@xxxxxxx>");
+MODULE_LICENSE("GPL v2");
+
diff --git a/include/linux/mfd/sirf/audio.h b/include/linux/mfd/sirf/audio.h
new file mode 100644
index 0000000..f010466
--- /dev/null
+++ b/include/linux/mfd/sirf/audio.h
@@ -0,0 +1,22 @@
+/*
+ * audio.h -- Provide a struct to share the regmap to all child drivers
+ *
+ * Copyright (c) 2014 Cambridge Silicon Radio Limited, a CSR plc group company.
+ *
+ * Author: RongJun Ying <rongjun.ying@xxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ */
+
+#ifndef __MFD_SIRF_AUDIO_H
+#define __MFD_SIRF_AUDIO_H
+
+struct sirf_audio_dev {
+ struct regmap *regmap;
+};
+
+#endif /* __MFD_SIRF_AUDIO_H */
--
1.7.5.4
--
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