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Subject[PATCH v2 3/4] ASoC: fsl: Add Audio Mixer machine driver
Date
This patch implements Audio Mixer machine driver for NXP iMX8 SOCs.
It connects together Audio Mixer and related SAI instances.

Signed-off-by: Viorel Suman <viorel.suman@nxp.com>
---
sound/soc/fsl/Kconfig | 9 ++
sound/soc/fsl/Makefile | 2 +
sound/soc/fsl/imx-audmix.c | 333 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 344 insertions(+)
create mode 100644 sound/soc/fsl/imx-audmix.c

diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
index 0af2e056..d87c842 100644
--- a/sound/soc/fsl/Kconfig
+++ b/sound/soc/fsl/Kconfig
@@ -303,6 +303,15 @@ config SND_SOC_FSL_ASOC_CARD
CS4271, CS4272 and SGTL5000.
Say Y if you want to add support for Freescale Generic ASoC Sound Card.

+config SND_SOC_IMX_AUDMIX
+ tristate "SoC Audio support for i.MX boards with AUDMIX"
+ select SND_SOC_FSL_AUDMIX
+ select SND_SOC_FSL_SAI
+ help
+ SoC Audio support for i.MX boards with Audio Mixer
+ Say Y if you want to add support for SoC audio on an i.MX board with
+ an Audio Mixer.
+
endif # SND_IMX_SOC

endmenu
diff --git a/sound/soc/fsl/Makefile b/sound/soc/fsl/Makefile
index 4172d5a..c0dd044 100644
--- a/sound/soc/fsl/Makefile
+++ b/sound/soc/fsl/Makefile
@@ -62,6 +62,7 @@ snd-soc-imx-es8328-objs := imx-es8328.o
snd-soc-imx-sgtl5000-objs := imx-sgtl5000.o
snd-soc-imx-spdif-objs := imx-spdif.o
snd-soc-imx-mc13783-objs := imx-mc13783.o
+snd-soc-imx-audmix-objs := imx-audmix.o

obj-$(CONFIG_SND_SOC_EUKREA_TLV320) += snd-soc-eukrea-tlv320.o
obj-$(CONFIG_SND_SOC_PHYCORE_AC97) += snd-soc-phycore-ac97.o
@@ -71,3 +72,4 @@ obj-$(CONFIG_SND_SOC_IMX_ES8328) += snd-soc-imx-es8328.o
obj-$(CONFIG_SND_SOC_IMX_SGTL5000) += snd-soc-imx-sgtl5000.o
obj-$(CONFIG_SND_SOC_IMX_SPDIF) += snd-soc-imx-spdif.o
obj-$(CONFIG_SND_SOC_IMX_MC13783) += snd-soc-imx-mc13783.o
+obj-$(CONFIG_SND_SOC_IMX_AUDMIX) += snd-soc-imx-audmix.o
diff --git a/sound/soc/fsl/imx-audmix.c b/sound/soc/fsl/imx-audmix.c
new file mode 100644
index 0000000..30cce52
--- /dev/null
+++ b/sound/soc/fsl/imx-audmix.c
@@ -0,0 +1,333 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2017 NXP
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/clk.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+#include <linux/pm_runtime.h>
+#include "fsl_sai.h"
+#include "fsl_audmix.h"
+
+struct imx_audmix {
+ struct platform_device *pdev;
+ struct snd_soc_card card;
+ struct platform_device *audmix_pdev;
+ struct platform_device *out_pdev;
+ struct clk *cpu_mclk;
+ int num_dai;
+ struct snd_soc_dai_link *dai;
+ int num_dai_conf;
+ struct snd_soc_codec_conf *dai_conf;
+ int num_dapm_routes;
+ struct snd_soc_dapm_route *dapm_routes;
+};
+
+static const u32 imx_audmix_rates[] = {
+ 8000, 12000, 16000, 24000, 32000, 48000, 64000, 96000,
+};
+
+static const struct snd_pcm_hw_constraint_list imx_audmix_rate_constraints = {
+ .count = ARRAY_SIZE(imx_audmix_rates),
+ .list = imx_audmix_rates,
+};
+
+static int imx_audmix_fe_startup(struct snd_pcm_substream *substream)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct imx_audmix *priv = snd_soc_card_get_drvdata(rtd->card);
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct device *dev = rtd->card->dev;
+ unsigned long clk_rate = clk_get_rate(priv->cpu_mclk);
+ int ret;
+
+ if (clk_rate % 24576000 == 0) {
+ ret = snd_pcm_hw_constraint_list(runtime, 0,
+ SNDRV_PCM_HW_PARAM_RATE,
+ &imx_audmix_rate_constraints);
+ if (ret < 0)
+ return ret;
+ } else {
+ dev_warn(dev, "mclk may be not supported %lu\n", clk_rate);
+ }
+
+ ret = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
+ 1, 8);
+ if (ret < 0)
+ return ret;
+
+ return snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT,
+ FSL_AUDMIX_FORMATS);
+}
+
+static int imx_audmix_fe_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct device *dev = rtd->card->dev;
+ bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+ unsigned int fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF;
+ u32 channels = params_channels(params);
+ int ret, dir;
+
+ /* For playback the AUDMIX is slave, and for record is master */
+ fmt |= tx ? SND_SOC_DAIFMT_CBS_CFS : SND_SOC_DAIFMT_CBM_CFM;
+ dir = tx ? SND_SOC_CLOCK_OUT : SND_SOC_CLOCK_IN;
+
+ /* set DAI configuration */
+ ret = snd_soc_dai_set_fmt(rtd->cpu_dai, fmt);
+ if (ret) {
+ dev_err(dev, "failed to set cpu dai fmt: %d\n", ret);
+ return ret;
+ }
+
+ ret = snd_soc_dai_set_sysclk(rtd->cpu_dai, FSL_SAI_CLK_MAST1, 0, dir);
+ if (ret) {
+ dev_err(dev, "failed to set cpu sysclk: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * Per datasheet, AUDMIX expects 8 slots and 32 bits
+ * for every slot in TDM mode.
+ */
+ ret = snd_soc_dai_set_tdm_slot(rtd->cpu_dai, BIT(channels) - 1,
+ BIT(channels) - 1, 8, 32);
+ if (ret)
+ dev_err(dev, "failed to set cpu dai tdm slot: %d\n", ret);
+
+ return ret;
+}
+
+static int imx_audmix_be_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct device *dev = rtd->card->dev;
+ bool tx = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+ unsigned int fmt = SND_SOC_DAIFMT_DSP_A | SND_SOC_DAIFMT_NB_NF;
+ int ret;
+
+ if (!tx)
+ return 0;
+
+ /* For playback the AUDMIX is slave */
+ fmt |= SND_SOC_DAIFMT_CBM_CFM;
+
+ /* set AUDMIX DAI configuration */
+ ret = snd_soc_dai_set_fmt(rtd->cpu_dai, fmt);
+ if (ret)
+ dev_err(dev, "failed to set AUDMIX DAI fmt: %d\n", ret);
+
+ return ret;
+}
+
+static struct snd_soc_ops imx_audmix_fe_ops = {
+ .startup = imx_audmix_fe_startup,
+ .hw_params = imx_audmix_fe_hw_params,
+};
+
+static struct snd_soc_ops imx_audmix_be_ops = {
+ .hw_params = imx_audmix_be_hw_params,
+};
+
+static int imx_audmix_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct device_node *audmix_np = NULL, *out_cpu_np = NULL;
+ struct platform_device *audmix_pdev = NULL;
+ struct platform_device *cpu_pdev;
+ struct of_phandle_args args;
+ struct imx_audmix *priv;
+ int i, num_dai, ret;
+ const char *fe_name_pref = "HiFi-AUDMIX-FE-";
+ char *be_name, *be_pb, *be_cp, *dai_name, *capture_dai_name;
+
+ num_dai = of_count_phandle_with_args(np, "dais", NULL);
+ if (num_dai != FSL_AUDMIX_MAX_DAIS) {
+ dev_err(&pdev->dev, "Need 2 dais to be provided for %s\n",
+ np->full_name);
+ return -EINVAL;
+ }
+
+ audmix_np = of_parse_phandle(np, "audmix-controller", 0);
+ if (!audmix_np) {
+ dev_err(&pdev->dev, "Missing audmix-controller phandle at %s\n",
+ np->full_name);
+ return -EINVAL;
+ }
+
+ audmix_pdev = of_find_device_by_node(audmix_np);
+ if (!audmix_pdev) {
+ dev_err(&pdev->dev, "Missing AUDMIX platform device for %s\n",
+ np->full_name);
+ return -EINVAL;
+ }
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->num_dai = 2 * num_dai;
+ priv->dai = devm_kzalloc(&pdev->dev, priv->num_dai *
+ sizeof(struct snd_soc_dai_link), GFP_KERNEL);
+ if (!priv->dai)
+ return -ENOMEM;
+
+ priv->num_dai_conf = num_dai;
+ priv->dai_conf = devm_kzalloc(&pdev->dev, priv->num_dai_conf *
+ sizeof(struct snd_soc_codec_conf),
+ GFP_KERNEL);
+ if (!priv->dai_conf)
+ return -ENOMEM;
+
+ priv->num_dapm_routes = 3 * num_dai;
+ priv->dapm_routes = devm_kzalloc(&pdev->dev, priv->num_dapm_routes *
+ sizeof(struct snd_soc_dapm_route),
+ GFP_KERNEL);
+ if (!priv->dapm_routes)
+ return -ENOMEM;
+
+ for (i = 0; i < num_dai; i++) {
+ ret = of_parse_phandle_with_args(np, "dais", NULL, i, &args);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "of_parse_phandle_with_args failed\n");
+ return ret;
+ }
+
+ cpu_pdev = of_find_device_by_node(args.np);
+ if (!cpu_pdev) {
+ dev_err(&pdev->dev, "failed to find SAI platform device\n");
+ return -EINVAL;
+ }
+
+ dai_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s%s",
+ fe_name_pref, args.np->full_name + 1);
+
+ dev_info(&pdev->dev, "DAI FE name:%s\n", dai_name);
+
+ if (i == 0) {
+ out_cpu_np = args.np;
+ capture_dai_name =
+ devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s %s",
+ dai_name, "CPU-Capture");
+ }
+
+ priv->dai[i].name = dai_name;
+ priv->dai[i].stream_name = "HiFi-AUDMIX-FE";
+ priv->dai[i].codec_dai_name = "snd-soc-dummy-dai";
+ priv->dai[i].codec_name = "snd-soc-dummy";
+ priv->dai[i].cpu_of_node = args.np;
+ priv->dai[i].cpu_dai_name = dev_name(&cpu_pdev->dev);
+ priv->dai[i].platform_of_node = args.np;
+ priv->dai[i].dynamic = 1;
+ priv->dai[i].dpcm_playback = 1;
+ priv->dai[i].dpcm_capture = (i == 0 ? 1 : 0);
+ priv->dai[i].ignore_pmdown_time = 1;
+ priv->dai[i].ops = &imx_audmix_fe_ops;
+
+ /* Add AUDMIX Backend */
+ be_name = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+ "audmix-%d", i);
+ be_pb = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+ "AUDMIX-Playback-%d", i);
+ be_cp = devm_kasprintf(&pdev->dev, GFP_KERNEL,
+ "AUDMIX-Capture-%d", i);
+
+ priv->dai[num_dai + i].name = be_name;
+ priv->dai[num_dai + i].codec_dai_name = "snd-soc-dummy-dai";
+ priv->dai[num_dai + i].codec_name = "snd-soc-dummy";
+ priv->dai[num_dai + i].cpu_of_node = audmix_np;
+ priv->dai[num_dai + i].cpu_dai_name = be_name;
+ priv->dai[num_dai + i].platform_name = "snd-soc-dummy";
+ priv->dai[num_dai + i].no_pcm = 1;
+ priv->dai[num_dai + i].dpcm_playback = 1;
+ priv->dai[num_dai + i].dpcm_capture = 1;
+ priv->dai[num_dai + i].ignore_pmdown_time = 1;
+ priv->dai[num_dai + i].ops = &imx_audmix_be_ops;
+
+ priv->dai_conf[i].of_node = args.np;
+ priv->dai_conf[i].name_prefix = dai_name;
+
+ priv->dapm_routes[i].source =
+ devm_kasprintf(&pdev->dev, GFP_KERNEL, "%s %s",
+ dai_name, "CPU-Playback");
+ priv->dapm_routes[i].sink = be_pb;
+ priv->dapm_routes[num_dai + i].source = be_pb;
+ priv->dapm_routes[num_dai + i].sink = be_cp;
+ priv->dapm_routes[2 * num_dai + i].source = be_cp;
+ priv->dapm_routes[2 * num_dai + i].sink = capture_dai_name;
+ }
+
+ cpu_pdev = of_find_device_by_node(out_cpu_np);
+ if (!cpu_pdev) {
+ dev_err(&pdev->dev, "failed to find SAI platform device\n");
+ return -EINVAL;
+ }
+ priv->cpu_mclk = devm_clk_get(&cpu_pdev->dev, "mclk1");
+ if (IS_ERR(priv->cpu_mclk)) {
+ ret = PTR_ERR(priv->cpu_mclk);
+ dev_err(&cpu_pdev->dev, "failed to get DAI mclk1: %d\n", ret);
+ return -EINVAL;
+ }
+
+ priv->audmix_pdev = audmix_pdev;
+ priv->out_pdev = cpu_pdev;
+
+ priv->card.dai_link = priv->dai;
+ priv->card.num_links = priv->num_dai;
+ priv->card.codec_conf = priv->dai_conf;
+ priv->card.num_configs = priv->num_dai_conf;
+ priv->card.dapm_routes = priv->dapm_routes;
+ priv->card.num_dapm_routes = priv->num_dapm_routes;
+ priv->card.dev = &pdev->dev;
+ priv->card.owner = THIS_MODULE;
+
+ ret = snd_soc_of_parse_card_name(&priv->card, "model");
+ if (ret) {
+ dev_err(&pdev->dev, "snd_soc_of_parse_card_name failed\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, &priv->card);
+ snd_soc_card_set_drvdata(&priv->card, priv);
+
+ ret = devm_snd_soc_register_card(&pdev->dev, &priv->card);
+ if (ret) {
+ dev_err(&pdev->dev, "snd_soc_register_card failed\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static const struct of_device_id imx_audmix_dt_ids[] = {
+ { .compatible = "fsl,imx-audmix", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_audmix_dt_ids);
+
+static struct platform_driver imx_audmix_driver = {
+ .probe = imx_audmix_probe,
+ .driver = {
+ .name = "imx-audmix",
+ .of_match_table = imx_audmix_dt_ids,
+ .pm = &snd_soc_pm_ops,
+ },
+};
+module_platform_driver(imx_audmix_driver);
+
+MODULE_DESCRIPTION("NXP AUDMIX ASoC machine driver");
+MODULE_AUTHOR("Viorel Suman <viorel.suman@nxp.com>");
+MODULE_ALIAS("platform:imx-audmix");
+MODULE_LICENSE("GPL v2");
--
2.7.4
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