| /* |
| * ALSA SoC IMX MQS driver |
| * |
| * Copyright (C) 2014 Freescale Semiconductor, Inc. |
| * |
| * 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/clk.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/mfd/syscon.h> |
| #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h> |
| #include <linux/of.h> |
| #include <linux/slab.h> |
| #include <sound/soc.h> |
| #include <sound/pcm.h> |
| #include <sound/initval.h> |
| |
| |
| /* codec private data */ |
| struct fsl_mqs { |
| struct platform_device *pdev; |
| struct regmap *gpr; |
| struct clk *mclk; |
| |
| unsigned long mclk_rate; |
| |
| int sysclk_rate; |
| int bclk; |
| int lrclk; |
| char name[32]; |
| }; |
| |
| #define FSL_MQS_RATES SNDRV_PCM_RATE_8000_192000 |
| #define FSL_MQS_FORMATS SNDRV_PCM_FMTBIT_S16_LE |
| |
| static int fsl_mqs_hw_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params, |
| struct snd_soc_dai *dai) |
| { |
| struct snd_soc_codec *codec = dai->codec; |
| struct fsl_mqs *mqs_priv = snd_soc_codec_get_drvdata(codec); |
| int div, res; |
| |
| mqs_priv->bclk = snd_soc_params_to_bclk(params); |
| mqs_priv->lrclk = params_rate(params); |
| |
| /* |
| * mclk_rate / (oversample(32,64) * FS * 2 * divider ) = repeat_rate; |
| * if repeat_rate is 8, mqs can achieve better quality. |
| * oversample rate is fix to 32 currently. |
| */ |
| div = mqs_priv->mclk_rate / (32 * 2 * mqs_priv->lrclk * 8); |
| res = mqs_priv->mclk_rate % (32 * 2 * mqs_priv->lrclk * 8); |
| |
| if (res == 0 && div > 0 && div <= 256) { |
| regmap_update_bits(mqs_priv->gpr, IOMUXC_GPR2, |
| IMX6SX_GPR2_MQS_CLK_DIV_MASK, (div-1) << IMX6SX_GPR2_MQS_CLK_DIV_SHIFT); |
| regmap_update_bits(mqs_priv->gpr, IOMUXC_GPR2, |
| IMX6SX_GPR2_MQS_OVERSAMPLE_MASK, 0 << IMX6SX_GPR2_MQS_OVERSAMPLE_SHIFT); |
| } else |
| dev_err(&mqs_priv->pdev->dev, "can't get proper divider\n"); |
| |
| return 0; |
| } |
| |
| static int fsl_mqs_set_dai_fmt(struct snd_soc_dai *dai, unsigned int fmt) |
| { |
| switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { |
| case SND_SOC_DAIFMT_LEFT_J: |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| switch (fmt & SND_SOC_DAIFMT_INV_MASK) { |
| case SND_SOC_DAIFMT_NB_NF: |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { |
| case SND_SOC_DAIFMT_CBS_CFS: |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int fsl_mqs_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id, |
| unsigned int freq, int dir) |
| { |
| struct snd_soc_codec *codec = dai->codec; |
| struct fsl_mqs *mqs_priv = snd_soc_codec_get_drvdata(codec); |
| |
| mqs_priv->sysclk_rate = freq; |
| |
| return 0; |
| } |
| |
| static int fsl_mqs_startup(struct snd_pcm_substream *substream, |
| struct snd_soc_dai *dai) |
| { |
| struct snd_soc_codec *codec = dai->codec; |
| struct fsl_mqs *mqs_priv = snd_soc_codec_get_drvdata(codec); |
| |
| regmap_update_bits(mqs_priv->gpr, IOMUXC_GPR2, IMX6SX_GPR2_MQS_EN_MASK, |
| 1 << IMX6SX_GPR2_MQS_EN_SHIFT); |
| return 0; |
| } |
| |
| static void fsl_mqs_shutdown(struct snd_pcm_substream *substream, |
| struct snd_soc_dai *dai) |
| { |
| struct snd_soc_codec *codec = dai->codec; |
| struct fsl_mqs *mqs_priv = snd_soc_codec_get_drvdata(codec); |
| |
| regmap_update_bits(mqs_priv->gpr, IOMUXC_GPR2, |
| IMX6SX_GPR2_MQS_EN_MASK, 0); |
| |
| } |
| |
| |
| static struct snd_soc_codec_driver soc_codec_fsl_mqs; |
| |
| static const struct snd_soc_dai_ops fsl_mqs_dai_ops = { |
| .startup = fsl_mqs_startup, |
| .shutdown = fsl_mqs_shutdown, |
| .hw_params = fsl_mqs_hw_params, |
| .set_fmt = fsl_mqs_set_dai_fmt, |
| .set_sysclk = fsl_mqs_set_dai_sysclk, |
| }; |
| |
| static struct snd_soc_dai_driver fsl_mqs_dai = { |
| .name = "fsl-mqs-dai", |
| .playback = { |
| .stream_name = "Playback", |
| .channels_min = 2, |
| .channels_max = 2, |
| .rates = FSL_MQS_RATES, |
| .formats = FSL_MQS_FORMATS, |
| }, |
| .ops = &fsl_mqs_dai_ops, |
| }; |
| |
| static int fsl_mqs_probe(struct platform_device *pdev) |
| { |
| struct device_node *np = pdev->dev.of_node; |
| struct device_node *gpr_np; |
| struct fsl_mqs *mqs_priv; |
| int ret = 0; |
| |
| mqs_priv = devm_kzalloc(&pdev->dev, sizeof(*mqs_priv), GFP_KERNEL); |
| if (!mqs_priv) |
| return -ENOMEM; |
| |
| mqs_priv->pdev = pdev; |
| strcpy(mqs_priv->name, np->name); |
| |
| gpr_np = of_parse_phandle(np, "gpr", 0); |
| if (IS_ERR(gpr_np)) { |
| dev_err(&pdev->dev, "failed to get gpr node by phandle\n"); |
| ret = PTR_ERR(gpr_np); |
| goto out; |
| } |
| |
| mqs_priv->gpr = syscon_node_to_regmap(gpr_np); |
| if (IS_ERR(mqs_priv->gpr)) { |
| dev_err(&pdev->dev, "failed to get gpr regmap\n"); |
| ret = PTR_ERR(mqs_priv->gpr); |
| goto out; |
| } |
| |
| mqs_priv->mclk = devm_clk_get(&pdev->dev, "mclk"); |
| if (IS_ERR(mqs_priv->mclk)) { |
| dev_err(&pdev->dev, "failed to get the clock: %ld\n", |
| PTR_ERR(mqs_priv->mclk)); |
| goto out; |
| } |
| |
| mqs_priv->mclk_rate = clk_get_rate(mqs_priv->mclk); |
| |
| dev_set_drvdata(&pdev->dev, mqs_priv); |
| |
| return snd_soc_register_codec(&pdev->dev, &soc_codec_fsl_mqs, |
| &fsl_mqs_dai, 1); |
| |
| out: |
| if (!IS_ERR(gpr_np)) |
| of_node_put(gpr_np); |
| |
| return ret; |
| } |
| |
| static int fsl_mqs_remove(struct platform_device *pdev) |
| { |
| snd_soc_unregister_codec(&pdev->dev); |
| return 0; |
| } |
| |
| static const struct of_device_id fsl_mqs_dt_ids[] = { |
| { .compatible = "fsl,imx6sx-mqs", }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(of, fsl_mqs_dt_ids); |
| |
| |
| static struct platform_driver fsl_mqs_driver = { |
| .probe = fsl_mqs_probe, |
| .remove = fsl_mqs_remove, |
| .driver = { |
| .name = "fsl-mqs", |
| .owner = THIS_MODULE, |
| .of_match_table = fsl_mqs_dt_ids, |
| }, |
| }; |
| |
| module_platform_driver(fsl_mqs_driver); |
| |
| MODULE_AUTHOR("shengjiu wang <shengjiu.wang@freescale.com>"); |
| MODULE_DESCRIPTION("MQS dummy codec driver"); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS("platform: fsl-mqs"); |