sound/soc/fsl/fsl_rpmsg.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 // Copyright 2018-2021 NXP

 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/delay.h>
 #include <linux/dmaengine.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/of_address.h>
 #include <linux/pm_runtime.h>
 #include <linux/rpmsg.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/dmaengine_pcm.h>
 #include <sound/pcm_params.h>

 #include "fsl_rpmsg.h"
 #include "imx-pcm.h"

 #define FSL_RPMSG_RATES        (SNDRV_PCM_RATE_8000 | \
 				SNDRV_PCM_RATE_16000 | \
 				SNDRV_PCM_RATE_48000)
 #define FSL_RPMSG_FORMATS	SNDRV_PCM_FMTBIT_S16_LE

 /* 192kHz/32bit/2ch/60s size is 0x574e00 */
 #define LPA_LARGE_BUFFER_SIZE  (0x6000000)

 static const unsigned int fsl_rpmsg_rates[] = {
 	8000, 11025, 16000, 22050, 44100,
 	32000, 48000, 96000, 88200, 176400, 192000,
 	352800, 384000, 705600, 768000, 1411200, 2822400,
 };

 static const struct snd_pcm_hw_constraint_list fsl_rpmsg_rate_constraints = {
 	.count = ARRAY_SIZE(fsl_rpmsg_rates),
 	.list = fsl_rpmsg_rates,
 };

 static int fsl_rpmsg_hw_params(struct snd_pcm_substream *substream,
 			       struct snd_pcm_hw_params *params,
 			       struct snd_soc_dai *dai)
 {
 	struct fsl_rpmsg *rpmsg = snd_soc_dai_get_drvdata(dai);
 	struct clk *p = rpmsg->mclk, *pll = NULL, *npll = NULL;
 	u64 rate = params_rate(params);
 	int ret = 0;

 	/* Get current pll parent */
 	while (p && rpmsg->pll8k && rpmsg->pll11k) {
 		struct clk *pp = clk_get_parent(p);

 		if (clk_is_match(pp, rpmsg->pll8k) ||
 		    clk_is_match(pp, rpmsg->pll11k)) {
 			pll = pp;
 			break;
 		}
 		p = pp;
 	}

 	/* Switch to another pll parent if needed. */
 	if (pll) {
 		npll = (do_div(rate, 8000) ? rpmsg->pll11k : rpmsg->pll8k);
 		if (!clk_is_match(pll, npll)) {
 			ret = clk_set_parent(p, npll);
 			if (ret < 0)
 				dev_warn(dai->dev, "failed to set parent %s: %d\n",
 					 __clk_get_name(npll), ret);
 		}
 	}

 	if (!(rpmsg->mclk_streams & BIT(substream->stream))) {
 		ret = clk_prepare_enable(rpmsg->mclk);
 		if (ret) {
 			dev_err(dai->dev, "failed to enable mclk: %d\n", ret);
 			return ret;
 		}

 		rpmsg->mclk_streams |= BIT(substream->stream);
 	}

 	return ret;
 }

 static int fsl_rpmsg_hw_free(struct snd_pcm_substream *substream,
 			     struct snd_soc_dai *dai)
 {
 	struct fsl_rpmsg *rpmsg = snd_soc_dai_get_drvdata(dai);

 	if (rpmsg->mclk_streams & BIT(substream->stream)) {
 		clk_disable_unprepare(rpmsg->mclk);
 		rpmsg->mclk_streams &= ~BIT(substream->stream);
 	}

 	return 0;
 }

 static int fsl_rpmsg_startup(struct snd_pcm_substream *substream,
 			     struct snd_soc_dai *cpu_dai)
 {
 	int ret;

 	ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
 					 SNDRV_PCM_HW_PARAM_RATE,
 					 &fsl_rpmsg_rate_constraints);

 	return ret;
 }

 static const struct snd_soc_dai_ops fsl_rpmsg_dai_ops = {
 	.startup	= fsl_rpmsg_startup,
 	.hw_params      = fsl_rpmsg_hw_params,
 	.hw_free        = fsl_rpmsg_hw_free,
 };

 static struct snd_soc_dai_driver fsl_rpmsg_dai = {
 	.playback = {
 		.stream_name = "CPU-Playback",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_KNOT,
 		.formats = FSL_RPMSG_FORMATS,
 	},
 	.capture = {
 		.stream_name = "CPU-Capture",
 		.channels_min = 2,
 		.channels_max = 2,
 		.rates = SNDRV_PCM_RATE_KNOT,
 		.formats = FSL_RPMSG_FORMATS,
 	},
 	.symmetric_rate        = 1,
 	.symmetric_channels    = 1,
 	.symmetric_sample_bits = 1,
 	.ops = &fsl_rpmsg_dai_ops,
 };

 static const struct snd_soc_component_driver fsl_component = {
 	.name           = "fsl-rpmsg",
 };

 static const struct of_device_id fsl_rpmsg_ids[] = {
 	{ .compatible = "fsl,imx7ulp-rpmsg-audio"},
 	{ .compatible = "fsl,imx8mm-rpmsg-audio"},
 	{ .compatible = "fsl,imx8mn-rpmsg-audio"},
 	{ .compatible = "fsl,imx8mp-rpmsg-audio"},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, fsl_rpmsg_ids);

 static int fsl_rpmsg_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
 	struct fsl_rpmsg *rpmsg;
 	int ret;

 	rpmsg = devm_kzalloc(&pdev->dev, sizeof(struct fsl_rpmsg), GFP_KERNEL);
 	if (!rpmsg)
 		return -ENOMEM;

 	if (of_property_read_bool(np, "fsl,enable-lpa")) {
 		rpmsg->enable_lpa = 1;
 		rpmsg->buffer_size = LPA_LARGE_BUFFER_SIZE;
 	} else {
 		rpmsg->buffer_size = IMX_DEFAULT_DMABUF_SIZE;
 	}

 	/* Get the optional clocks */
 	rpmsg->ipg = devm_clk_get_optional(&pdev->dev, "ipg");
 	if (IS_ERR(rpmsg->ipg))
 		return PTR_ERR(rpmsg->ipg);

 	rpmsg->mclk = devm_clk_get_optional(&pdev->dev, "mclk");
 	if (IS_ERR(rpmsg->mclk))
 		return PTR_ERR(rpmsg->mclk);

 	rpmsg->dma = devm_clk_get_optional(&pdev->dev, "dma");
 	if (IS_ERR(rpmsg->dma))
 		return PTR_ERR(rpmsg->dma);

 	rpmsg->pll8k = devm_clk_get_optional(&pdev->dev, "pll8k");
 	if (IS_ERR(rpmsg->pll8k))
 		return PTR_ERR(rpmsg->pll8k);

 	rpmsg->pll11k = devm_clk_get_optional(&pdev->dev, "pll11k");
 	if (IS_ERR(rpmsg->pll11k))
 		return PTR_ERR(rpmsg->pll11k);

 	platform_set_drvdata(pdev, rpmsg);
 	pm_runtime_enable(&pdev->dev);

 	ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
 					      &fsl_rpmsg_dai, 1);
 	if (ret)
 		return ret;

 	rpmsg->card_pdev = platform_device_register_data(&pdev->dev,
 							 "imx-audio-rpmsg",
 							 PLATFORM_DEVID_NONE,
 							 NULL,
 							 0);
 	if (IS_ERR(rpmsg->card_pdev)) {
 		dev_err(&pdev->dev, "failed to register rpmsg card\n");
 		ret = PTR_ERR(rpmsg->card_pdev);
 		return ret;
 	}

 	return 0;
 }

 static int fsl_rpmsg_remove(struct platform_device *pdev)
 {
 	struct fsl_rpmsg *rpmsg = platform_get_drvdata(pdev);

 	if (rpmsg->card_pdev)
 		platform_device_unregister(rpmsg->card_pdev);

 	return 0;
 }

 #ifdef CONFIG_PM
 static int fsl_rpmsg_runtime_resume(struct device *dev)
 {
 	struct fsl_rpmsg *rpmsg = dev_get_drvdata(dev);
 	int ret;

 	ret = clk_prepare_enable(rpmsg->ipg);
 	if (ret) {
 		dev_err(dev, "failed to enable ipg clock: %d\n", ret);
 		goto ipg_err;
 	}

 	ret = clk_prepare_enable(rpmsg->dma);
 	if (ret) {
 		dev_err(dev, "Failed to enable dma clock %d\n", ret);
 		goto dma_err;
 	}

 	return 0;

 dma_err:
 	clk_disable_unprepare(rpmsg->ipg);
 ipg_err:
 	return ret;
 }

 static int fsl_rpmsg_runtime_suspend(struct device *dev)
 {
 	struct fsl_rpmsg *rpmsg = dev_get_drvdata(dev);

 	clk_disable_unprepare(rpmsg->dma);
 	clk_disable_unprepare(rpmsg->ipg);

 	return 0;
 }
 #endif

 static const struct dev_pm_ops fsl_rpmsg_pm_ops = {
 	SET_RUNTIME_PM_OPS(fsl_rpmsg_runtime_suspend,
 			   fsl_rpmsg_runtime_resume,
 			   NULL)
 	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
 				pm_runtime_force_resume)
 };

 static struct platform_driver fsl_rpmsg_driver = {
 	.probe  = fsl_rpmsg_probe,
 	.remove = fsl_rpmsg_remove,
 	.driver = {
 		.name = "fsl_rpmsg",
 		.pm = &fsl_rpmsg_pm_ops,
 		.of_match_table = fsl_rpmsg_ids,
 	},
 };
 module_platform_driver(fsl_rpmsg_driver);

 MODULE_DESCRIPTION("Freescale SoC Audio PRMSG CPU Interface");
 MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
 MODULE_ALIAS("platform:fsl_rpmsg");
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0+
	// Copyright 2018-2021 NXP

	#include <linux/clk.h>
	#include <linux/clk-provider.h>
	#include <linux/delay.h>
	#include <linux/dmaengine.h>
	#include <linux/module.h>
	#include <linux/of_device.h>
	#include <linux/of_address.h>
	#include <linux/pm_runtime.h>
	#include <linux/rpmsg.h>
	#include <linux/slab.h>
	#include <sound/core.h>
	#include <sound/dmaengine_pcm.h>
	#include <sound/pcm_params.h>

	#include "fsl_rpmsg.h"
	#include "imx-pcm.h"

	#define FSL_RPMSG_RATES (SNDRV_PCM_RATE_8000 \| \
	SNDRV_PCM_RATE_16000 \| \
	SNDRV_PCM_RATE_48000)
	#define FSL_RPMSG_FORMATS SNDRV_PCM_FMTBIT_S16_LE

	/* 192kHz/32bit/2ch/60s size is 0x574e00 */
	#define LPA_LARGE_BUFFER_SIZE (0x6000000)

	static const unsigned int fsl_rpmsg_rates[] = {
	8000, 11025, 16000, 22050, 44100,
	32000, 48000, 96000, 88200, 176400, 192000,
	352800, 384000, 705600, 768000, 1411200, 2822400,
	};

	static const struct snd_pcm_hw_constraint_list fsl_rpmsg_rate_constraints = {
	.count = ARRAY_SIZE(fsl_rpmsg_rates),
	.list = fsl_rpmsg_rates,
	};

	static int fsl_rpmsg_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct fsl_rpmsg *rpmsg = snd_soc_dai_get_drvdata(dai);
	struct clk p = rpmsg->mclk, pll = NULL, *npll = NULL;
	u64 rate = params_rate(params);
	int ret = 0;

	/* Get current pll parent */
	while (p && rpmsg->pll8k && rpmsg->pll11k) {
	struct clk *pp = clk_get_parent(p);

	if (clk_is_match(pp, rpmsg->pll8k) \|\|
	clk_is_match(pp, rpmsg->pll11k)) {
	pll = pp;
	break;
	}
	p = pp;
	}

	/* Switch to another pll parent if needed. */
	if (pll) {
	npll = (do_div(rate, 8000) ? rpmsg->pll11k : rpmsg->pll8k);
	if (!clk_is_match(pll, npll)) {
	ret = clk_set_parent(p, npll);
	if (ret < 0)
	dev_warn(dai->dev, "failed to set parent %s: %d\n",
	__clk_get_name(npll), ret);
	}
	}

	if (!(rpmsg->mclk_streams & BIT(substream->stream))) {
	ret = clk_prepare_enable(rpmsg->mclk);
	if (ret) {
	dev_err(dai->dev, "failed to enable mclk: %d\n", ret);
	return ret;
	}

	rpmsg->mclk_streams \|= BIT(substream->stream);
	}

	return ret;
	}

	static int fsl_rpmsg_hw_free(struct snd_pcm_substream *substream,
	struct snd_soc_dai *dai)
	{
	struct fsl_rpmsg *rpmsg = snd_soc_dai_get_drvdata(dai);

	if (rpmsg->mclk_streams & BIT(substream->stream)) {
	clk_disable_unprepare(rpmsg->mclk);
	rpmsg->mclk_streams &= ~BIT(substream->stream);
	}

	return 0;
	}

	static int fsl_rpmsg_startup(struct snd_pcm_substream *substream,
	struct snd_soc_dai *cpu_dai)
	{
	int ret;

	ret = snd_pcm_hw_constraint_list(substream->runtime, 0,
	SNDRV_PCM_HW_PARAM_RATE,
	&fsl_rpmsg_rate_constraints);

	return ret;
	}

	static const struct snd_soc_dai_ops fsl_rpmsg_dai_ops = {
	.startup = fsl_rpmsg_startup,
	.hw_params = fsl_rpmsg_hw_params,
	.hw_free = fsl_rpmsg_hw_free,
	};

	static struct snd_soc_dai_driver fsl_rpmsg_dai = {
	.playback = {
	.stream_name = "CPU-Playback",
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_KNOT,
	.formats = FSL_RPMSG_FORMATS,
	},
	.capture = {
	.stream_name = "CPU-Capture",
	.channels_min = 2,
	.channels_max = 2,
	.rates = SNDRV_PCM_RATE_KNOT,
	.formats = FSL_RPMSG_FORMATS,
	},
	.symmetric_rate = 1,
	.symmetric_channels = 1,
	.symmetric_sample_bits = 1,
	.ops = &fsl_rpmsg_dai_ops,
	};

	static const struct snd_soc_component_driver fsl_component = {
	.name = "fsl-rpmsg",
	};

	static const struct of_device_id fsl_rpmsg_ids[] = {
	{ .compatible = "fsl,imx7ulp-rpmsg-audio"},
	{ .compatible = "fsl,imx8mm-rpmsg-audio"},
	{ .compatible = "fsl,imx8mn-rpmsg-audio"},
	{ .compatible = "fsl,imx8mp-rpmsg-audio"},
	{ /* sentinel */ }
	};
	MODULE_DEVICE_TABLE(of, fsl_rpmsg_ids);

	static int fsl_rpmsg_probe(struct platform_device *pdev)
	{
	struct device_node *np = pdev->dev.of_node;
	struct fsl_rpmsg *rpmsg;
	int ret;

	rpmsg = devm_kzalloc(&pdev->dev, sizeof(struct fsl_rpmsg), GFP_KERNEL);
	if (!rpmsg)
	return -ENOMEM;

	if (of_property_read_bool(np, "fsl,enable-lpa")) {
	rpmsg->enable_lpa = 1;
	rpmsg->buffer_size = LPA_LARGE_BUFFER_SIZE;
	} else {
	rpmsg->buffer_size = IMX_DEFAULT_DMABUF_SIZE;
	}

	/* Get the optional clocks */
	rpmsg->ipg = devm_clk_get_optional(&pdev->dev, "ipg");
	if (IS_ERR(rpmsg->ipg))
	return PTR_ERR(rpmsg->ipg);

	rpmsg->mclk = devm_clk_get_optional(&pdev->dev, "mclk");
	if (IS_ERR(rpmsg->mclk))
	return PTR_ERR(rpmsg->mclk);

	rpmsg->dma = devm_clk_get_optional(&pdev->dev, "dma");
	if (IS_ERR(rpmsg->dma))
	return PTR_ERR(rpmsg->dma);

	rpmsg->pll8k = devm_clk_get_optional(&pdev->dev, "pll8k");
	if (IS_ERR(rpmsg->pll8k))
	return PTR_ERR(rpmsg->pll8k);

	rpmsg->pll11k = devm_clk_get_optional(&pdev->dev, "pll11k");
	if (IS_ERR(rpmsg->pll11k))
	return PTR_ERR(rpmsg->pll11k);

	platform_set_drvdata(pdev, rpmsg);
	pm_runtime_enable(&pdev->dev);

	ret = devm_snd_soc_register_component(&pdev->dev, &fsl_component,
	&fsl_rpmsg_dai, 1);
	if (ret)
	return ret;

	rpmsg->card_pdev = platform_device_register_data(&pdev->dev,
	"imx-audio-rpmsg",
	PLATFORM_DEVID_NONE,
	NULL,
	0);
	if (IS_ERR(rpmsg->card_pdev)) {
	dev_err(&pdev->dev, "failed to register rpmsg card\n");
	ret = PTR_ERR(rpmsg->card_pdev);
	return ret;
	}

	return 0;
	}

	static int fsl_rpmsg_remove(struct platform_device *pdev)
	{
	struct fsl_rpmsg *rpmsg = platform_get_drvdata(pdev);

	if (rpmsg->card_pdev)
	platform_device_unregister(rpmsg->card_pdev);

	return 0;
	}

	#ifdef CONFIG_PM
	static int fsl_rpmsg_runtime_resume(struct device *dev)
	{
	struct fsl_rpmsg *rpmsg = dev_get_drvdata(dev);
	int ret;

	ret = clk_prepare_enable(rpmsg->ipg);
	if (ret) {
	dev_err(dev, "failed to enable ipg clock: %d\n", ret);
	goto ipg_err;
	}

	ret = clk_prepare_enable(rpmsg->dma);
	if (ret) {
	dev_err(dev, "Failed to enable dma clock %d\n", ret);
	goto dma_err;
	}

	return 0;

	dma_err:
	clk_disable_unprepare(rpmsg->ipg);
	ipg_err:
	return ret;
	}

	static int fsl_rpmsg_runtime_suspend(struct device *dev)
	{
	struct fsl_rpmsg *rpmsg = dev_get_drvdata(dev);

	clk_disable_unprepare(rpmsg->dma);
	clk_disable_unprepare(rpmsg->ipg);

	return 0;
	}
	#endif

	static const struct dev_pm_ops fsl_rpmsg_pm_ops = {
	SET_RUNTIME_PM_OPS(fsl_rpmsg_runtime_suspend,
	fsl_rpmsg_runtime_resume,
	NULL)
	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
	pm_runtime_force_resume)
	};

	static struct platform_driver fsl_rpmsg_driver = {
	.probe = fsl_rpmsg_probe,
	.remove = fsl_rpmsg_remove,
	.driver = {
	.name = "fsl_rpmsg",
	.pm = &fsl_rpmsg_pm_ops,
	.of_match_table = fsl_rpmsg_ids,
	},
	};
	module_platform_driver(fsl_rpmsg_driver);

	MODULE_DESCRIPTION("Freescale SoC Audio PRMSG CPU Interface");
	MODULE_AUTHOR("Shengjiu Wang <shengjiu.wang@nxp.com>");
	MODULE_ALIAS("platform:fsl_rpmsg");
	MODULE_LICENSE("GPL");