ASoC: ep93xx i2s audio driver (db5bf412) · Commits · e / devices / android_kernel_xiaomi_markw

sound/soc/Kconfig

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		@@ -28,6 +28,7 @@ source "sound/soc/atmel/Kconfig"
		source "sound/soc/au1x/Kconfig"
		source "sound/soc/blackfin/Kconfig"
		source "sound/soc/davinci/Kconfig"
		source "sound/soc/ep93xx/Kconfig"
		source "sound/soc/fsl/Kconfig"
		source "sound/soc/imx/Kconfig"
		source "sound/soc/nuc900/Kconfig"

sound/soc/Makefile

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Original line number	Diff line number	Diff line
		@@ -6,6 +6,7 @@ obj-$(CONFIG_SND_SOC) += atmel/
		obj-$(CONFIG_SND_SOC) += au1x/
		obj-$(CONFIG_SND_SOC) += blackfin/
		obj-$(CONFIG_SND_SOC) += davinci/
		obj-$(CONFIG_SND_SOC) += ep93xx/
		obj-$(CONFIG_SND_SOC) += fsl/
		obj-$(CONFIG_SND_SOC) += imx/
		obj-$(CONFIG_SND_SOC) += nuc900/

sound/soc/ep93xx/Kconfig

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		config SND_EP93XX_SOC
		tristate "SoC Audio support for the Cirrus Logic EP93xx series"
		depends on ARCH_EP93XX && SND_SOC
		help
		Say Y or M if you want to add support for codecs attached to
		the EP93xx I2S interface.

		config SND_EP93XX_SOC_I2S
		tristate

sound/soc/ep93xx/Makefile

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		# EP93xx Platform Support
		snd-soc-ep93xx-objs := ep93xx-pcm.o
		snd-soc-ep93xx-i2s-objs := ep93xx-i2s.o

		obj-$(CONFIG_SND_EP93XX_SOC) += snd-soc-ep93xx.o
		obj-$(CONFIG_SND_EP93XX_SOC_I2S) += snd-soc-ep93xx-i2s.o

		# EP93XX Machine Support

sound/soc/ep93xx/ep93xx-i2s.c

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Original line number	Diff line number	Diff line
		/*
		* linux/sound/soc/ep93xx-i2s.c
		* EP93xx I2S driver
		*
		* Copyright (C) 2010 Ryan Mallon <ryan@bluewatersys.com>
		*
		* Based on the original driver by:
		* Copyright (C) 2007 Chase Douglas <chasedouglas@gmail>
		* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
		*
		* 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.
		*
		*/

		#include <linux/module.h>
		#include <linux/init.h>
		#include <linux/slab.h>
		#include <linux/clk.h>
		#include <linux/io.h>

		#include <sound/core.h>
		#include <sound/pcm.h>
		#include <sound/pcm_params.h>
		#include <sound/initval.h>
		#include <sound/soc.h>

		#include <mach/hardware.h>
		#include <mach/ep93xx-regs.h>
		#include <mach/dma.h>

		#include "ep93xx-pcm.h"
		#include "ep93xx-i2s.h"

		#define EP93XX_I2S_TXCLKCFG 0x00
		#define EP93XX_I2S_RXCLKCFG 0x04
		#define EP93XX_I2S_GLCTRL 0x0C

		#define EP93XX_I2S_TXLINCTRLDATA 0x28
		#define EP93XX_I2S_TXCTRL 0x2C
		#define EP93XX_I2S_TXWRDLEN 0x30
		#define EP93XX_I2S_TX0EN 0x34

		#define EP93XX_I2S_RXLINCTRLDATA 0x58
		#define EP93XX_I2S_RXCTRL 0x5C
		#define EP93XX_I2S_RXWRDLEN 0x60
		#define EP93XX_I2S_RX0EN 0x64

		#define EP93XX_I2S_WRDLEN_16 (0 << 0)
		#define EP93XX_I2S_WRDLEN_24 (1 << 0)
		#define EP93XX_I2S_WRDLEN_32 (2 << 0)

		#define EP93XX_I2S_LINCTRLDATA_R_JUST (1 << 2) /* Right justify */

		#define EP93XX_I2S_CLKCFG_LRS (1 << 0) /* lrclk polarity */
		#define EP93XX_I2S_CLKCFG_CKP (1 << 1) /* Bit clock polarity */
		#define EP93XX_I2S_CLKCFG_REL (1 << 2) /* First bit transition */
		#define EP93XX_I2S_CLKCFG_MASTER (1 << 3) /* Master mode */
		#define EP93XX_I2S_CLKCFG_NBCG (1 << 4) /* Not bit clock gating */

		struct ep93xx_i2s_info {
		struct clk *mclk;
		struct clk *sclk;
		struct clk *lrclk;
		struct ep93xx_pcm_dma_params *dma_params;
		struct resource *mem;
		void __iomem *regs;
		};

		struct ep93xx_pcm_dma_params ep93xx_i2s_dma_params[] = {
		[SNDRV_PCM_STREAM_PLAYBACK] = {
		.name = "i2s-pcm-out",
		.dma_port = EP93XX_DMA_M2P_PORT_I2S1,
		},
		[SNDRV_PCM_STREAM_CAPTURE] = {
		.name = "i2s-pcm-in",
		.dma_port = EP93XX_DMA_M2P_PORT_I2S1,
		},
		};

		static inline void ep93xx_i2s_write_reg(struct ep93xx_i2s_info *info,
		unsigned reg, unsigned val)
		{
		__raw_writel(val, info->regs + reg);
		}

		static inline unsigned ep93xx_i2s_read_reg(struct ep93xx_i2s_info *info,
		unsigned reg)
		{
		return __raw_readl(info->regs + reg);
		}

		static void ep93xx_i2s_enable(struct ep93xx_i2s_info *info, int stream)
		{
		unsigned base_reg;
		int i;

		if ((ep93xx_i2s_read_reg(info, EP93XX_I2S_TX0EN) & 0x1) == 0 &&
		(ep93xx_i2s_read_reg(info, EP93XX_I2S_RX0EN) & 0x1) == 0) {
		/* Enable clocks */
		clk_enable(info->mclk);
		clk_enable(info->sclk);
		clk_enable(info->lrclk);

		/* Enable i2s */
		ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 1);
		}

		/* Enable fifos */
		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
		base_reg = EP93XX_I2S_TX0EN;
		else
		base_reg = EP93XX_I2S_RX0EN;
		for (i = 0; i < 3; i++)
		ep93xx_i2s_write_reg(info, base_reg + (i * 4), 1);
		}

		static void ep93xx_i2s_disable(struct ep93xx_i2s_info *info, int stream)
		{
		unsigned base_reg;
		int i;

		/* Disable fifos */
		if (stream == SNDRV_PCM_STREAM_PLAYBACK)
		base_reg = EP93XX_I2S_TX0EN;
		else
		base_reg = EP93XX_I2S_RX0EN;
		for (i = 0; i < 3; i++)
		ep93xx_i2s_write_reg(info, base_reg + (i * 4), 0);

		if ((ep93xx_i2s_read_reg(info, EP93XX_I2S_TX0EN) & 0x1) == 0 &&
		(ep93xx_i2s_read_reg(info, EP93XX_I2S_RX0EN) & 0x1) == 0) {
		/* Disable i2s */
		ep93xx_i2s_write_reg(info, EP93XX_I2S_GLCTRL, 0);

		/* Disable clocks */
		clk_disable(info->lrclk);
		clk_disable(info->sclk);
		clk_disable(info->mclk);
		}
		}

		static int ep93xx_i2s_startup(struct snd_pcm_substream *substream,
		struct snd_soc_dai *dai)
		{
		struct snd_soc_pcm_runtime *rtd = substream->private_data;
		struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
		struct ep93xx_i2s_info *info = rtd->dai->cpu_dai->private_data;

		snd_soc_dai_set_dma_data(cpu_dai, substream,
		&info->dma_params[substream->stream]);
		return 0;
		}

		static void ep93xx_i2s_shutdown(struct snd_pcm_substream *substream,
		struct snd_soc_dai *dai)
		{
		struct snd_soc_pcm_runtime *rtd = substream->private_data;
		struct ep93xx_i2s_info *info = rtd->dai->cpu_dai->private_data;

		ep93xx_i2s_disable(info, substream->stream);
		}

		static int ep93xx_i2s_set_dai_fmt(struct snd_soc_dai *cpu_dai,
		unsigned int fmt)
		{
		struct ep93xx_i2s_info *info = cpu_dai->private_data;
		unsigned int clk_cfg, lin_ctrl;

		clk_cfg = ep93xx_i2s_read_reg(info, EP93XX_I2S_RXCLKCFG);
		lin_ctrl = ep93xx_i2s_read_reg(info, EP93XX_I2S_RXLINCTRLDATA);

		switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
		case SND_SOC_DAIFMT_I2S:
		clk_cfg \|= EP93XX_I2S_CLKCFG_REL;
		lin_ctrl &= ~EP93XX_I2S_LINCTRLDATA_R_JUST;
		break;

		case SND_SOC_DAIFMT_LEFT_J:
		clk_cfg &= ~EP93XX_I2S_CLKCFG_REL;
		lin_ctrl &= ~EP93XX_I2S_LINCTRLDATA_R_JUST;
		break;

		case SND_SOC_DAIFMT_RIGHT_J:
		clk_cfg &= ~EP93XX_I2S_CLKCFG_REL;
		lin_ctrl \|= EP93XX_I2S_LINCTRLDATA_R_JUST;
		break;

		default:
		return -EINVAL;
		}

		switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
		case SND_SOC_DAIFMT_CBS_CFS:
		/* CPU is master */
		clk_cfg \|= EP93XX_I2S_CLKCFG_MASTER;
		break;

		case SND_SOC_DAIFMT_CBM_CFM:
		/* Codec is master */
		clk_cfg &= ~EP93XX_I2S_CLKCFG_MASTER;
		break;

		default:
		return -EINVAL;
		}

		switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
		case SND_SOC_DAIFMT_NB_NF:
		/* Negative bit clock, lrclk low on left word */
		clk_cfg &= ~(EP93XX_I2S_CLKCFG_CKP \| EP93XX_I2S_CLKCFG_REL);
		break;

		case SND_SOC_DAIFMT_NB_IF:
		/* Negative bit clock, lrclk low on right word */
		clk_cfg &= ~EP93XX_I2S_CLKCFG_CKP;
		clk_cfg \|= EP93XX_I2S_CLKCFG_REL;
		break;

		case SND_SOC_DAIFMT_IB_NF:
		/* Positive bit clock, lrclk low on left word */
		clk_cfg \|= EP93XX_I2S_CLKCFG_CKP;
		clk_cfg &= ~EP93XX_I2S_CLKCFG_REL;
		break;

		case SND_SOC_DAIFMT_IB_IF:
		/* Positive bit clock, lrclk low on right word */
		clk_cfg \|= EP93XX_I2S_CLKCFG_CKP \| EP93XX_I2S_CLKCFG_REL;
		break;
		}

		/* Write new register values */
		ep93xx_i2s_write_reg(info, EP93XX_I2S_RXCLKCFG, clk_cfg);
		ep93xx_i2s_write_reg(info, EP93XX_I2S_TXCLKCFG, clk_cfg);
		ep93xx_i2s_write_reg(info, EP93XX_I2S_RXLINCTRLDATA, lin_ctrl);
		ep93xx_i2s_write_reg(info, EP93XX_I2S_TXLINCTRLDATA, lin_ctrl);
		return 0;
		}

		static int ep93xx_i2s_hw_params(struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *params,
		struct snd_soc_dai *dai)
		{
		struct snd_soc_pcm_runtime *rtd = substream->private_data;
		struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
		struct ep93xx_i2s_info *info = cpu_dai->private_data;
		unsigned word_len, div, sdiv, lrdiv;
		int found = 0, err;

		switch (params_format(params)) {
		case SNDRV_PCM_FORMAT_S16_LE:
		word_len = EP93XX_I2S_WRDLEN_16;
		break;

		case SNDRV_PCM_FORMAT_S24_LE:
		word_len = EP93XX_I2S_WRDLEN_24;
		break;

		case SNDRV_PCM_FORMAT_S32_LE:
		word_len = EP93XX_I2S_WRDLEN_32;
		break;

		default:
		return -EINVAL;
		}

		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		ep93xx_i2s_write_reg(info, EP93XX_I2S_TXWRDLEN, word_len);
		else
		ep93xx_i2s_write_reg(info, EP93XX_I2S_RXWRDLEN, word_len);

		/*
		* Calculate the sdiv (bit clock) and lrdiv (left/right clock) values.
		* If the lrclk is pulse length is larger than the word size, then the
		* bit clock will be gated for the unused bits.
		*/
		div = (clk_get_rate(info->mclk) / params_rate(params)) *
		params_channels(params);
		for (sdiv = 2; sdiv <= 4; sdiv += 2)
		for (lrdiv = 32; lrdiv <= 128; lrdiv <<= 1)
		if (sdiv * lrdiv == div) {
		found = 1;
		goto out;
		}
		out:
		if (!found)
		return -EINVAL;

		err = clk_set_rate(info->sclk, clk_get_rate(info->mclk) / sdiv);
		if (err)
		return err;

		err = clk_set_rate(info->lrclk, clk_get_rate(info->sclk) / lrdiv);
		if (err)
		return err;

		ep93xx_i2s_enable(info, substream->stream);
		return 0;
		}

		static int ep93xx_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id,
		unsigned int freq, int dir)
		{
		struct ep93xx_i2s_info *info = cpu_dai->private_data;

		if (dir == SND_SOC_CLOCK_IN \|\| clk_id != 0)
		return -EINVAL;

		return clk_set_rate(info->mclk, freq);
		}

		#ifdef CONFIG_PM
		static int ep93xx_i2s_suspend(struct snd_soc_dai *dai)
		{
		struct ep93xx_i2s_info *info = dai->private_data;

		if (!dai->active)
		return;

		ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_PLAYBACK);
		ep93xx_i2s_disable(info, SNDRV_PCM_STREAM_CAPTURE);
		}

		static int ep93xx_i2s_resume(struct snd_soc_dai *dai)
		{
		struct ep93xx_i2s_info *info = dai->private_data;

		if (!dai->active)
		return;

		ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_PLAYBACK);
		ep93xx_i2s_enable(info, SNDRV_PCM_STREAM_CAPTURE);
		}
		#else
		#define ep93xx_i2s_suspend NULL
		#define ep93xx_i2s_resume NULL
		#endif

		static struct snd_soc_dai_ops ep93xx_i2s_dai_ops = {
		.startup = ep93xx_i2s_startup,
		.shutdown = ep93xx_i2s_shutdown,
		.hw_params = ep93xx_i2s_hw_params,
		.set_sysclk = ep93xx_i2s_set_sysclk,
		.set_fmt = ep93xx_i2s_set_dai_fmt,
		};

		#define EP93XX_I2S_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| \
		SNDRV_PCM_FMTBIT_S24_LE \| \
		SNDRV_PCM_FMTBIT_S32_LE)

		struct snd_soc_dai ep93xx_i2s_dai = {
		.name = "ep93xx-i2s",
		.id = 0,
		.symmetric_rates= 1,
		.suspend = ep93xx_i2s_suspend,
		.resume = ep93xx_i2s_resume,
		.playback = {
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_48000,
		.formats = EP93XX_I2S_FORMATS,
		},
		.capture = {
		.channels_min = 2,
		.channels_max = 2,
		.rates = SNDRV_PCM_RATE_8000_48000,
		.formats = EP93XX_I2S_FORMATS,
		},
		.ops = &ep93xx_i2s_dai_ops,
		};
		EXPORT_SYMBOL_GPL(ep93xx_i2s_dai);

		static int ep93xx_i2s_probe(struct platform_device *pdev)
		{
		struct ep93xx_i2s_info *info;
		struct resource *res;
		int err;

		info = kzalloc(sizeof(struct ep93xx_i2s_info), GFP_KERNEL);
		if (!info) {
		err = -ENOMEM;
		goto fail;
		}

		ep93xx_i2s_dai.dev = &pdev->dev;
		ep93xx_i2s_dai.private_data = info;
		info->dma_params = ep93xx_i2s_dma_params;

		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
		if (!res) {
		err = -ENODEV;
		goto fail;
		}

		info->mem = request_mem_region(res->start, resource_size(res),
		pdev->name);
		if (!info->mem) {
		err = -EBUSY;
		goto fail;
		}

		info->regs = ioremap(info->mem->start, resource_size(info->mem));
		if (!info->regs) {
		err = -ENXIO;
		goto fail_release_mem;
		}

		info->mclk = clk_get(&pdev->dev, "mclk");
		if (IS_ERR(info->mclk)) {
		err = PTR_ERR(info->mclk);
		goto fail_unmap_mem;
		}

		info->sclk = clk_get(&pdev->dev, "sclk");
		if (IS_ERR(info->sclk)) {
		err = PTR_ERR(info->sclk);
		goto fail_put_mclk;
		}

		info->lrclk = clk_get(&pdev->dev, "lrclk");
		if (IS_ERR(info->lrclk)) {
		err = PTR_ERR(info->lrclk);
		goto fail_put_sclk;
		}

		err = snd_soc_register_dai(&ep93xx_i2s_dai);
		if (err)
		goto fail_put_lrclk;

		return 0;

		fail_put_lrclk:
		clk_put(info->lrclk);
		fail_put_sclk:
		clk_put(info->sclk);
		fail_put_mclk:
		clk_put(info->mclk);
		fail_unmap_mem:
		iounmap(info->regs);
		fail_release_mem:
		release_mem_region(info->mem->start, resource_size(info->mem));
		kfree(info);
		fail:
		return err;
		}

		static int __devexit ep93xx_i2s_remove(struct platform_device *pdev)
		{
		struct ep93xx_i2s_info *info = ep93xx_i2s_dai.private_data;

		snd_soc_unregister_dai(&ep93xx_i2s_dai);
		clk_put(info->lrclk);
		clk_put(info->sclk);
		clk_put(info->mclk);
		iounmap(info->regs);
		release_mem_region(info->mem->start, resource_size(info->mem));
		kfree(info);
		return 0;
		}

		static struct platform_driver ep93xx_i2s_driver = {
		.probe = ep93xx_i2s_probe,
		.remove = __devexit_p(ep93xx_i2s_remove),
		.driver = {
		.name = "ep93xx-i2s",
		.owner = THIS_MODULE,
		},
		};

		static int __init ep93xx_i2s_init(void)
		{
		return platform_driver_register(&ep93xx_i2s_driver);
		}

		static void __exit ep93xx_i2s_exit(void)
		{
		platform_driver_unregister(&ep93xx_i2s_driver);
		}

		module_init(ep93xx_i2s_init);
		module_exit(ep93xx_i2s_exit);

		MODULE_ALIAS("platform:ep93xx-i2s");
		MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com>");
		MODULE_DESCRIPTION("EP93XX I2S driver");
		MODULE_LICENSE("GPL");