From: Rongjun Ying <[email protected]> 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 <[email protected]> --- -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 <[email protected]> + * + * 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 <[email protected]>"); +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 <[email protected]> + * + * 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
