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Commit 3e086edf authored by olivier moysan's avatar olivier moysan Committed by Mark Brown
Browse files

ASoC: stm32: add SAI driver 



This patch implements SAI ASoC driver for STM32.

Signed-off-by: default avatarolivier moysan <olivier.moysan@st.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent b45c4f11

sound/soc/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -63,6 +63,7 @@ source "sound/soc/sh/Kconfig" 
source "sound/soc/sirf/Kconfig"

source "sound/soc/spear/Kconfig"

source "sound/soc/sti/Kconfig"

source "sound/soc/stm/Kconfig"

source "sound/soc/sunxi/Kconfig"

source "sound/soc/tegra/Kconfig"

source "sound/soc/txx9/Kconfig"

sound/soc/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ obj-$(CONFIG_SND_SOC) += sh/ 
obj-$(CONFIG_SND_SOC)	+= sirf/

obj-$(CONFIG_SND_SOC)	+= spear/

obj-$(CONFIG_SND_SOC)	+= sti/

obj-$(CONFIG_SND_SOC)	+= stm/

obj-$(CONFIG_SND_SOC)	+= sunxi/

obj-$(CONFIG_SND_SOC)	+= tegra/

obj-$(CONFIG_SND_SOC)	+= txx9/

sound/soc/stm/Kconfig

0 → 100644
+8 −0
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menuconfig SND_SOC_STM32

	tristate "STMicroelectronics STM32 SOC audio support"

	depends on ARCH_STM32 || COMPILE_TEST

	depends on SND_SOC

	select SND_SOC_GENERIC_DMAENGINE_PCM

	select REGMAP_MMIO

	help

	  Say Y if you want to enable ASoC-support for STM32

sound/soc/stm/Makefile

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+6 −0
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# SAI

snd-soc-stm32-sai-sub-objs := stm32_sai_sub.o

obj-$(CONFIG_SND_SOC_STM32) += snd-soc-stm32-sai-sub.o



snd-soc-stm32-sai-objs := stm32_sai.o

obj-$(CONFIG_SND_SOC_STM32) += snd-soc-stm32-sai.o

sound/soc/stm/stm32_sai.c

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+115 −0
Original line number Diff line number Diff line 
/*

 * STM32 ALSA SoC Digital Audio Interface (SAI) driver.

 *

 * Copyright (C) 2016, STMicroelectronics - All Rights Reserved

 * Author(s): Olivier Moysan <olivier.moysan@st.com> for STMicroelectronics.

 *

 * License terms: GPL V2.0.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 as published by

 * the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more

 * details.

 */



#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/module.h>

#include <linux/of_platform.h>

#include <linux/reset.h>



#include <sound/dmaengine_pcm.h>

#include <sound/core.h>



#include "stm32_sai.h"



static const struct of_device_id stm32_sai_ids[] = {

	{ .compatible = "st,stm32f4-sai", .data = (void *)SAI_STM32F4 },

	{}

};



static int stm32_sai_probe(struct platform_device *pdev)

{

	struct device_node *np = pdev->dev.of_node;

	struct stm32_sai_data *sai;

	struct reset_control *rst;

	struct resource *res;

	void __iomem *base;

	const struct of_device_id *of_id;



	sai = devm_kzalloc(&pdev->dev, sizeof(*sai), GFP_KERNEL);

	if (!sai)

		return -ENOMEM;



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	base = devm_ioremap_resource(&pdev->dev, res);

	if (IS_ERR(base))

		return PTR_ERR(base);



	of_id = of_match_device(stm32_sai_ids, &pdev->dev);

	if (of_id)

		sai->version = (enum stm32_sai_version)of_id->data;

	else

		return -EINVAL;



	sai->clk_x8k = devm_clk_get(&pdev->dev, "x8k");

	if (IS_ERR(sai->clk_x8k)) {

		dev_err(&pdev->dev, "missing x8k parent clock\n");

		return PTR_ERR(sai->clk_x8k);

	}



	sai->clk_x11k = devm_clk_get(&pdev->dev, "x11k");

	if (IS_ERR(sai->clk_x11k)) {

		dev_err(&pdev->dev, "missing x11k parent clock\n");

		return PTR_ERR(sai->clk_x11k);

	}



	/* init irqs */

	sai->irq = platform_get_irq(pdev, 0);

	if (sai->irq < 0) {

		dev_err(&pdev->dev, "no irq for node %s\n", pdev->name);

		return sai->irq;

	}



	/* reset */

	rst = reset_control_get(&pdev->dev, NULL);

	if (!IS_ERR(rst)) {

		reset_control_assert(rst);

		udelay(2);

		reset_control_deassert(rst);

	}



	sai->pdev = pdev;

	platform_set_drvdata(pdev, sai);



	return of_platform_populate(np, NULL, NULL, &pdev->dev);

}



static int stm32_sai_remove(struct platform_device *pdev)

{

	of_platform_depopulate(&pdev->dev);



	return 0;

}



MODULE_DEVICE_TABLE(of, stm32_sai_ids);



static struct platform_driver stm32_sai_driver = {

	.driver = {

		.name = "st,stm32-sai",

		.of_match_table = stm32_sai_ids,

	},

	.probe = stm32_sai_probe,

	.remove = stm32_sai_remove,

};



module_platform_driver(stm32_sai_driver);



MODULE_DESCRIPTION("STM32 Soc SAI Interface");

MODULE_AUTHOR("Olivier Moysan, <olivier.moysan@st.com>");

MODULE_ALIAS("platform:st,stm32-sai");

MODULE_LICENSE("GPL v2");