[RFC PATCH] ASoC: fsl: Add Audio Mixer CPU DAI driver

From: Viorel Suman
Date: Tue Dec 18 2018 - 11:30:32 EST

This patch implements Audio Mixer CPU DAI driver for NXP iMX8 SOCs.
The Audio Mixer is a on-chip functional module that allows mixing of
two audio streams into a single audio stream.

Audio Mixer datasheet is available here:
https://www.nxp.com/docs/en/reference-manual/IMX8DQXPRM.pdf

Signed-off-by: Viorel Suman <viorel.suman@xxxxxxx>
---
.../devicetree/bindings/sound/fsl,amix.txt | 45 ++
sound/soc/fsl/Kconfig | 7 +
sound/soc/fsl/Makefile | 3 +
sound/soc/fsl/fsl_amix.c | 554 +++++++++++++++++++++
sound/soc/fsl/fsl_amix.h | 101 ++++
5 files changed, 710 insertions(+)
create mode 100644 Documentation/devicetree/bindings/sound/fsl,amix.txt
create mode 100644 sound/soc/fsl/fsl_amix.c
create mode 100644 sound/soc/fsl/fsl_amix.h

diff --git a/Documentation/devicetree/bindings/sound/fsl,amix.txt b/Documentation/devicetree/bindings/sound/fsl,amix.txt
new file mode 100644
index 0000000..049144f
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/fsl,amix.txt
@@ -0,0 +1,45 @@
+NXP Audio Mixer (AMIX).
+
+The Audio Mixer is a on-chip functional module that allows mixing of two
+audio streams into a single audio stream. Audio Mixer has two input serial
+audio interfaces. These are driven by two Synchronous Audio interface
+modules (SAI). Each input serial interface carries 8 audio channels in its
+frame in TDM manner. Mixer mixes audio samples of corresponding channels
+from two interfaces into a single sample. Before mixing, audio samples of
+two inputs can be attenuated based on configuration. The output of the
+Audio Mixer is also a serial audio interface. Like input interfaces it has
+the same TDM frame format. This output is used to drive the serial DAC TDM
+interface of audio codec and also sent to the external pins along with the
+receive path of normal audio SAI module for readback by the CPU.
+
+The output of Audio mixer can be selected from any of the three streams
+ - serial audio input 1
+ - serial audio input 2
+ - Mixed audio
+
+Mixing operation is independent of audio sample rate but the two audio
+input streams must have same audio sample rate with same number of channels
+in TDM frame to be eligible for mixing.
+
+Device driver required properties:
+=================================
+ - compatible : Compatible list, contains "fsl,imx8qm-amix"
+
+ - reg : Offset and length of the register set for the device.
+
+ - clocks : Must contain an entry for each entry in clock-names.
+
+ - clock-names : Must include the "ipg" for register access.
+
+ - power-domains : Must contain the phandle to the AMIX power domain node
+
+Device driver configuration example:
+======================================
+ amix: amix@59840000 {
+ compatible = "fsl,imx8qm-amix";
+ reg = <0x0 0x59840000 0x0 0x10000>;
+ clocks = <&clk IMX8QXP_AUD_AMIX_IPG>;
+ clock-names = "ipg";
+ power-domains = <&pd_amix>;
+ };
+
diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
index 2e75b5bc..0b08eb2 100644
--- a/sound/soc/fsl/Kconfig
+++ b/sound/soc/fsl/Kconfig
@@ -24,6 +24,13 @@ config SND_SOC_FSL_SAI
This option is only useful for out-of-tree drivers since
in-tree drivers select it automatically.

+config SND_SOC_FSL_AMIX
+ tristate "Audio Mixer (AMIX) module support"
+ select REGMAP_MMIO
+ help
+ Say Y if you want to add Audio Mixer (AMIX)
+ support for the NXP iMX CPUs.
+
config SND_SOC_FSL_SSI
tristate "Synchronous Serial Interface module (SSI) support"
select SND_SOC_IMX_PCM_DMA if SND_IMX_SOC != n
diff --git a/sound/soc/fsl/Makefile b/sound/soc/fsl/Makefile
index de94fa0..3263634 100644
--- a/sound/soc/fsl/Makefile
+++ b/sound/soc/fsl/Makefile
@@ -12,6 +12,7 @@ snd-soc-p1022-rdk-objs := p1022_rdk.o
obj-$(CONFIG_SND_SOC_P1022_RDK) += snd-soc-p1022-rdk.o

# Freescale SSI/DMA/SAI/SPDIF Support
+snd-soc-fsl-amix-objs := fsl_amix.o
snd-soc-fsl-asoc-card-objs := fsl-asoc-card.o
snd-soc-fsl-asrc-objs := fsl_asrc.o fsl_asrc_dma.o
snd-soc-fsl-sai-objs := fsl_sai.o
@@ -21,6 +22,8 @@ snd-soc-fsl-spdif-objs := fsl_spdif.o
snd-soc-fsl-esai-objs := fsl_esai.o
snd-soc-fsl-utils-objs := fsl_utils.o
snd-soc-fsl-dma-objs := fsl_dma.o
+
+obj-$(CONFIG_SND_SOC_FSL_AMIX) += snd-soc-fsl-amix.o
obj-$(CONFIG_SND_SOC_FSL_ASOC_CARD) += snd-soc-fsl-asoc-card.o
obj-$(CONFIG_SND_SOC_FSL_ASRC) += snd-soc-fsl-asrc.o
obj-$(CONFIG_SND_SOC_FSL_SAI) += snd-soc-fsl-sai.o
diff --git a/sound/soc/fsl/fsl_amix.c b/sound/soc/fsl/fsl_amix.c
new file mode 100644
index 0000000..d752029
--- /dev/null
+++ b/sound/soc/fsl/fsl_amix.c
@@ -0,0 +1,554 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * NXP AMIX ALSA SoC Digital Audio Interface (DAI) driver
+ *
+ * Copyright 2017 NXP
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+
+#include "fsl_amix.h"
+
+#define SOC_ENUM_SINGLE_S(xreg, xshift, xtexts) \
+ SOC_ENUM_SINGLE(xreg, xshift, ARRAY_SIZE(xtexts), xtexts)
+
+static const char
+ *tdm_sel[] = { "TDM1", "TDM2", },
+ *mode_sel[] = { "Disabled", "TDM1", "TDM2", "Mixed", },
+ *width_sel[] = { "16b", "18b", "20b", "24b", "32b", },
+ *pol_sel[] = { "Positive edge", "Negative edge", },
+ *endis_sel[] = { "Disabled", "Enabled", },
+ *updn_sel[] = { "Downward", "Upward", },
+ *mask_sel[] = { "Unmask", "Mask", };
+
+static const struct soc_enum fsl_amix_enum[] = {
+/* FSL_AMIX_CTR enums */
+SOC_ENUM_SINGLE_S(FSL_AMIX_CTR, FSL_AMIX_CTR_MIXCLK_SHIFT, tdm_sel),
+SOC_ENUM_SINGLE_S(FSL_AMIX_CTR, FSL_AMIX_CTR_OUTSRC_SHIFT, mode_sel),
+SOC_ENUM_SINGLE_S(FSL_AMIX_CTR, FSL_AMIX_CTR_OUTWIDTH_SHIFT, width_sel),
+SOC_ENUM_SINGLE_S(FSL_AMIX_CTR, FSL_AMIX_CTR_OUTCKPOL_SHIFT, pol_sel),
+SOC_ENUM_SINGLE_S(FSL_AMIX_CTR, FSL_AMIX_CTR_MASKRTDF_SHIFT, mask_sel),
+SOC_ENUM_SINGLE_S(FSL_AMIX_CTR, FSL_AMIX_CTR_MASKCKDF_SHIFT, mask_sel),
+SOC_ENUM_SINGLE_S(FSL_AMIX_CTR, FSL_AMIX_CTR_SYNCMODE_SHIFT, endis_sel),
+SOC_ENUM_SINGLE_S(FSL_AMIX_CTR, FSL_AMIX_CTR_SYNCSRC_SHIFT, tdm_sel),
+/* FSL_AMIX_ATCR0 enums */
+SOC_ENUM_SINGLE_S(FSL_AMIX_ATCR0, 0, endis_sel),
+SOC_ENUM_SINGLE_S(FSL_AMIX_ATCR0, 1, updn_sel),
+/* FSL_AMIX_ATCR1 enums */
+SOC_ENUM_SINGLE_S(FSL_AMIX_ATCR1, 0, endis_sel),
+SOC_ENUM_SINGLE_S(FSL_AMIX_ATCR1, 1, updn_sel),
+};
+
+struct fsl_amix_state {
+ u8 tdms;
+ u8 clk;
+ char msg[64];
+};
+
+static const struct fsl_amix_state prms[4][4] = {{
+ /* DIS->DIS, do nothing */
+ { .tdms = 0, .clk = 0, .msg = "" },
+ /* DIS->TDM1*/
+ { .tdms = 1, .clk = 1, .msg = "DIS->TDM1: TDM1 not started!\n" },
+ /* DIS->TDM2*/
+ { .tdms = 2, .clk = 2, .msg = "DIS->TDM2: TDM2 not started!\n" },
+ /* DIS->MIX */
+ { .tdms = 3, .clk = 0, .msg = "DIS->MIX: Please start both TDMs!\n" }
+}, { /* TDM1->DIS */
+ { .tdms = 1, .clk = 0, .msg = "TDM1->DIS: TDM1 not started!\n" },
+ /* TDM1->TDM1, do nothing */
+ { .tdms = 0, .clk = 0, .msg = "" },
+ /* TDM1->TDM2 */
+ { .tdms = 3, .clk = 2, .msg = "TDM1->TDM2: Please start both TDMs!\n" },
+ /* TDM1->MIX */
+ { .tdms = 3, .clk = 0, .msg = "TDM1->MIX: Please start both TDMs!\n" }
+}, { /* TDM2->DIS */
+ { .tdms = 2, .clk = 0, .msg = "TDM2->DIS: TDM2 not started!\n" },
+ /* TDM2->TDM1 */
+ { .tdms = 3, .clk = 1, .msg = "TDM2->TDM1: Please start both TDMs!\n" },
+ /* TDM2->TDM2, do nothing */
+ { .tdms = 0, .clk = 0, .msg = "" },
+ /* TDM2->MIX */
+ { .tdms = 3, .clk = 0, .msg = "TDM2->MIX: Please start both TDMs!\n" }
+}, { /* MIX->DIS */
+ { .tdms = 3, .clk = 0, .msg = "MIX->DIS: Please start both TDMs!\n" },
+ /* MIX->TDM1 */
+ { .tdms = 3, .clk = 1, .msg = "MIX->TDM1: Please start both TDMs!\n" },
+ /* MIX->TDM2 */
+ { .tdms = 3, .clk = 2, .msg = "MIX->TDM2: Please start both TDMs!\n" },
+ /* MIX->MIX, do nothing */
+ { .tdms = 0, .clk = 0, .msg = "" }
+}, };
+
+static int fsl_amix_state_trans(struct snd_soc_component *comp,
+ unsigned int *mask, unsigned int *ctr,
+ const struct fsl_amix_state prm)
+{
+ struct fsl_amix *priv = snd_soc_component_get_drvdata(comp);
+ /* Enforce all required TDMs are started */
+ if ((priv->tdms & prm.tdms) != prm.tdms) {
+ dev_dbg(comp->dev, prm.msg);
+ return -EINVAL;
+ }
+
+ switch (prm.clk) {
+ case 1:
+ case 2:
+ /* Set mix clock */
+ (*mask) |= FSL_AMIX_CTR_MIXCLK_MASK;
+ (*ctr) |= FSL_AMIX_CTR_MIXCLK(prm.clk - 1);
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int fsl_amix_put_mix_clk_src(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_component *comp = snd_kcontrol_chip(kcontrol);
+ struct fsl_amix *priv = snd_soc_component_get_drvdata(comp);
+ struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+ unsigned int *item = ucontrol->value.enumerated.item;
+ unsigned int reg_val, val, mix_clk;
+ int ret = 0;
+
+ /* Get current state */
+ ret = snd_soc_component_read(comp, FSL_AMIX_CTR, &reg_val);
+ if (ret)
+ return ret;
+
+ mix_clk = ((reg_val & FSL_AMIX_CTR_MIXCLK_MASK)
+ >> FSL_AMIX_CTR_MIXCLK_SHIFT);
+ val = snd_soc_enum_item_to_val(e, item[0]);
+
+ dev_dbg(comp->dev, "TDMs=x%08x, val=x%08x\n", priv->tdms, val);
+
+ /**
+ * Ensure the current selected mixer clock is available
+ * for configuration propagation
+ */
+ if (!(priv->tdms & BIT(mix_clk))) {
+ dev_err(comp->dev,
+ "Started TDM%d needed for config propagation!\n",
+ mix_clk + 1);
+ return -EINVAL;
+ }
+
+ if (!(priv->tdms & BIT(val))) {
+ dev_err(comp->dev,
+ "The selected clock source has no TDM%d enabled!\n",
+ val + 1);
+ return -EINVAL;
+ }
+
+ return snd_soc_put_enum_double(kcontrol, ucontrol);
+}
+
+static int fsl_amix_put_out_src(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_soc_component *comp = snd_kcontrol_chip(kcontrol);
+ struct fsl_amix *priv = snd_soc_component_get_drvdata(comp);
+ struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+ unsigned int *item = ucontrol->value.enumerated.item;
+ u32 out_src, mix_clk;
+ unsigned int reg_val, val, mask = 0, ctr = 0;
+ int ret = 0;
+
+ /* Get current state */
+ ret = snd_soc_component_read(comp, FSL_AMIX_CTR, &reg_val);
+ if (ret)
+ return ret;
+
+ /* "From" state */
+ out_src = ((reg_val & FSL_AMIX_CTR_OUTSRC_MASK)
+ >> FSL_AMIX_CTR_OUTSRC_SHIFT);
+ mix_clk = ((reg_val & FSL_AMIX_CTR_MIXCLK_MASK)
+ >> FSL_AMIX_CTR_MIXCLK_SHIFT);
+
+ /* "To" state */
+ val = snd_soc_enum_item_to_val(e, item[0]);
+
+ dev_dbg(comp->dev, "TDMs=x%08x, val=x%08x\n", priv->tdms, val);
+
+ /* Check if state is changing ... */
+ if (out_src == val)
+ return 0;
+ /**
+ * Ensure the current selected mixer clock is available
+ * for configuration propagation
+ */
+ if (!(priv->tdms & BIT(mix_clk))) {
+ dev_err(comp->dev,
+ "Started TDM%d needed for config propagation!\n",
+ mix_clk + 1);
+ return -EINVAL;
+ }
+
+ /* Check state transition constraints */
+ ret = fsl_amix_state_trans(comp, &mask, &ctr, prms[out_src][val]);
+ if (ret)
+ return ret;
+
+ /* Complete transition to new state */
+ mask |= FSL_AMIX_CTR_OUTSRC_MASK;
+ ctr |= FSL_AMIX_CTR_OUTSRC(val);
+
+ return snd_soc_component_update_bits(comp, FSL_AMIX_CTR, mask, ctr);
+}
+
+static const struct snd_kcontrol_new fsl_amix_snd_controls[] = {
+ /* FSL_AMIX_CTR controls */
+ SOC_ENUM_EXT("Mixing Clock Source", fsl_amix_enum[0],
+ snd_soc_get_enum_double, fsl_amix_put_mix_clk_src),
+ SOC_ENUM_EXT("Output Source", fsl_amix_enum[1],
+ snd_soc_get_enum_double, fsl_amix_put_out_src),
+ SOC_ENUM("Output Width", fsl_amix_enum[2]),
+ SOC_ENUM("Output Clock Polarity", fsl_amix_enum[3]),
+ SOC_ENUM("Frame Rate Diff Error", fsl_amix_enum[4]),
+ SOC_ENUM("Clock Freq Diff Error", fsl_amix_enum[5]),
+ SOC_ENUM("Sync Mode Config", fsl_amix_enum[6]),
+ SOC_ENUM("Sync Mode Clk Source", fsl_amix_enum[7]),
+ /* TDM1 Attenuation controls */
+ SOC_ENUM("TDM1 Attenuation", fsl_amix_enum[8]),
+ SOC_ENUM("TDM1 Attenuation Direction", fsl_amix_enum[9]),
+ SOC_SINGLE("TDM1 Attenuation Step Divider", FSL_AMIX_ATCR0,
+ 2, 0x00fff, 0),
+ SOC_SINGLE("TDM1 Attenuation Initial Value", FSL_AMIX_ATIVAL0,
+ 0, 0x3ffff, 0),
+ SOC_SINGLE("TDM1 Attenuation Step Up Factor", FSL_AMIX_ATSTPUP0,
+ 0, 0x3ffff, 0),
+ SOC_SINGLE("TDM1 Attenuation Step Down Factor", FSL_AMIX_ATSTPDN0,
+ 0, 0x3ffff, 0),
+ SOC_SINGLE("TDM1 Attenuation Step Target", FSL_AMIX_ATSTPTGT0,
+ 0, 0x3ffff, 0),
+ /* TDM2 Attenuation controls */
+ SOC_ENUM("TDM2 Attenuation", fsl_amix_enum[10]),
+ SOC_ENUM("TDM2 Attenuation Direction", fsl_amix_enum[11]),
+ SOC_SINGLE("TDM2 Attenuation Step Divider", FSL_AMIX_ATCR1,
+ 2, 0x00fff, 0),
+ SOC_SINGLE("TDM2 Attenuation Initial Value", FSL_AMIX_ATIVAL1,
+ 0, 0x3ffff, 0),
+ SOC_SINGLE("TDM2 Attenuation Step Up Factor", FSL_AMIX_ATSTPUP1,
+ 0, 0x3ffff, 0),
+ SOC_SINGLE("TDM2 Attenuation Step Down Factor", FSL_AMIX_ATSTPDN1,
+ 0, 0x3ffff, 0),
+ SOC_SINGLE("TDM2 Attenuation Step Target", FSL_AMIX_ATSTPTGT1,
+ 0, 0x3ffff, 0),
+};
+
+static int fsl_amix_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ struct snd_soc_component *comp = dai->component;
+ u32 mask = 0, ctr = 0;
+
+ /* AMIX is working in DSP_A format only */
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_DSP_A:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* For playback the AMIX is slave, and for record is master */
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBM_CFM:
+ case SND_SOC_DAIFMT_CBS_CFS:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_IB_NF:
+ /* Output data will be written on positive edge of the clock */
+ ctr |= FSL_AMIX_CTR_OUTCKPOL(0);
+ break;
+ case SND_SOC_DAIFMT_NB_NF:
+ /* Output data will be written on negative edge of the clock */
+ ctr |= FSL_AMIX_CTR_OUTCKPOL(1);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ mask |= FSL_AMIX_CTR_OUTCKPOL_MASK;
+
+ return snd_soc_component_update_bits(comp, FSL_AMIX_CTR, mask, ctr);
+}
+
+static int fsl_amix_dai_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct fsl_amix *priv = snd_soc_dai_get_drvdata(dai);
+
+ /* Capture stream shall not be handled */
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ return 0;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ priv->tdms |= BIT(dai->driver->id);
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ priv->tdms &= ~BIT(dai->driver->id);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static const struct snd_soc_dai_ops fsl_amix_dai_ops = {
+ .set_fmt = fsl_amix_dai_set_fmt,
+ .trigger = fsl_amix_dai_trigger,
+};
+
+static struct snd_soc_dai_driver fsl_amix_dai[] = {
+ {
+ .id = 0,
+ .name = "amix-0",
+ .playback = {
+ .stream_name = "AMIX-Playback-0",
+ .channels_min = 8,
+ .channels_max = 8,
+ .rate_min = 8000,
+ .rate_max = 96000,
+ .rates = SNDRV_PCM_RATE_8000_96000,
+ .formats = FSL_AMIX_FORMATS,
+ },
+ .capture = {
+ .stream_name = "AMIX-Capture-0",
+ .channels_min = 8,
+ .channels_max = 8,
+ .rate_min = 8000,
+ .rate_max = 96000,
+ .rates = SNDRV_PCM_RATE_8000_96000,
+ .formats = FSL_AMIX_FORMATS,
+ },
+ .ops = &fsl_amix_dai_ops,
+ },
+ {
+ .id = 1,
+ .name = "amix-1",
+ .playback = {
+ .stream_name = "AMIX-Playback-1",
+ .channels_min = 8,
+ .channels_max = 8,
+ .rate_min = 8000,
+ .rate_max = 96000,
+ .rates = SNDRV_PCM_RATE_8000_96000,
+ .formats = FSL_AMIX_FORMATS,
+ },
+ .capture = {
+ .stream_name = "AMIX-Capture-1",
+ .channels_min = 8,
+ .channels_max = 8,
+ .rate_min = 8000,
+ .rate_max = 96000,
+ .rates = SNDRV_PCM_RATE_8000_96000,
+ .formats = FSL_AMIX_FORMATS,
+ },
+ .ops = &fsl_amix_dai_ops,
+ },
+};
+
+static const struct snd_soc_component_driver fsl_amix_component = {
+ .name = "fsl-amix-dai",
+ .controls = fsl_amix_snd_controls,
+ .num_controls = ARRAY_SIZE(fsl_amix_snd_controls),
+};
+
+static bool fsl_amix_readable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case FSL_AMIX_CTR:
+ case FSL_AMIX_STR:
+ case FSL_AMIX_ATCR0:
+ case FSL_AMIX_ATIVAL0:
+ case FSL_AMIX_ATSTPUP0:
+ case FSL_AMIX_ATSTPDN0:
+ case FSL_AMIX_ATSTPTGT0:
+ case FSL_AMIX_ATTNVAL0:
+ case FSL_AMIX_ATSTP0:
+ case FSL_AMIX_ATCR1:
+ case FSL_AMIX_ATIVAL1:
+ case FSL_AMIX_ATSTPUP1:
+ case FSL_AMIX_ATSTPDN1:
+ case FSL_AMIX_ATSTPTGT1:
+ case FSL_AMIX_ATTNVAL1:
+ case FSL_AMIX_ATSTP1:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static bool fsl_amix_writeable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case FSL_AMIX_CTR:
+ case FSL_AMIX_ATCR0:
+ case FSL_AMIX_ATIVAL0:
+ case FSL_AMIX_ATSTPUP0:
+ case FSL_AMIX_ATSTPDN0:
+ case FSL_AMIX_ATSTPTGT0:
+ case FSL_AMIX_ATCR1:
+ case FSL_AMIX_ATIVAL1:
+ case FSL_AMIX_ATSTPUP1:
+ case FSL_AMIX_ATSTPDN1:
+ case FSL_AMIX_ATSTPTGT1:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct reg_default fsl_amix_reg[] = {
+ { FSL_AMIX_CTR, 0x00060 },
+ { FSL_AMIX_STR, 0x00003 },
+ { FSL_AMIX_ATCR0, 0x00000 },
+ { FSL_AMIX_ATIVAL0, 0x3FFFF },
+ { FSL_AMIX_ATSTPUP0, 0x2AAAA },
+ { FSL_AMIX_ATSTPDN0, 0x30000 },
+ { FSL_AMIX_ATSTPTGT0, 0x00010 },
+ { FSL_AMIX_ATTNVAL0, 0x00000 },
+ { FSL_AMIX_ATSTP0, 0x00000 },
+ { FSL_AMIX_ATCR1, 0x00000 },
+ { FSL_AMIX_ATIVAL1, 0x3FFFF },
+ { FSL_AMIX_ATSTPUP1, 0x2AAAA },
+ { FSL_AMIX_ATSTPDN1, 0x30000 },
+ { FSL_AMIX_ATSTPTGT1, 0x00010 },
+ { FSL_AMIX_ATTNVAL1, 0x00000 },
+ { FSL_AMIX_ATSTP1, 0x00000 },
+};
+
+static const struct regmap_config fsl_amix_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = FSL_AMIX_ATSTP1,
+ .reg_defaults = fsl_amix_reg,
+ .num_reg_defaults = ARRAY_SIZE(fsl_amix_reg),
+ .readable_reg = fsl_amix_readable_reg,
+ .writeable_reg = fsl_amix_writeable_reg,
+ .cache_type = REGCACHE_FLAT,
+};
+
+static int fsl_amix_probe(struct platform_device *pdev)
+{
+ struct fsl_amix *priv;
+ struct resource *res;
+ void __iomem *regs;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->pdev = pdev;
+
+ /* Get the addresses */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(regs))
+ return PTR_ERR(regs);
+
+ priv->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "ipg", regs,
+ &fsl_amix_regmap_config);
+ if (IS_ERR(priv->regmap)) {
+ dev_err(&pdev->dev, "failed to init regmap\n");
+ return PTR_ERR(priv->regmap);
+ }
+
+ priv->ipg_clk = devm_clk_get(&pdev->dev, "ipg");
+ if (IS_ERR(priv->ipg_clk)) {
+ dev_err(&pdev->dev, "failed to get ipg clock\n");
+ return PTR_ERR(priv->ipg_clk);
+ }
+
+ platform_set_drvdata(pdev, priv);
+ pm_runtime_enable(&pdev->dev);
+
+ ret = devm_snd_soc_register_component(&pdev->dev, &fsl_amix_component,
+ fsl_amix_dai,
+ ARRAY_SIZE(fsl_amix_dai));
+ if (ret) {
+ dev_err(&pdev->dev, "failed to register ASoC DAI\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int fsl_amix_runtime_resume(struct device *dev)
+{
+ struct fsl_amix *priv = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(priv->ipg_clk);
+ if (ret) {
+ dev_err(dev, "Failed to enable IPG clock: %d\n", ret);
+ return ret;
+ }
+
+ regcache_cache_only(priv->regmap, false);
+ regcache_mark_dirty(priv->regmap);
+
+ return regcache_sync(priv->regmap);
+}
+
+static int fsl_amix_runtime_suspend(struct device *dev)
+{
+ struct fsl_amix *priv = dev_get_drvdata(dev);
+
+ regcache_cache_only(priv->regmap, true);
+
+ clk_disable_unprepare(priv->ipg_clk);
+
+ return 0;
+}
+#endif /* CONFIG_PM */
+
+static const struct dev_pm_ops fsl_amix_pm = {
+ SET_RUNTIME_PM_OPS(fsl_amix_runtime_suspend,
+ fsl_amix_runtime_resume,
+ NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+};
+
+static const struct of_device_id fsl_amix_ids[] = {
+ { .compatible = "fsl,imx8qm-amix", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, fsl_amix_ids);
+
+static struct platform_driver fsl_amix_driver = {
+ .probe = fsl_amix_probe,
+ .driver = {
+ .name = "fsl-amix",
+ .of_match_table = fsl_amix_ids,
+ .pm = &fsl_amix_pm,
+ },
+};
+module_platform_driver(fsl_amix_driver);
+
+MODULE_DESCRIPTION("NXP AMIX ASoC DAI driver");
+MODULE_AUTHOR("Viorel Suman <viorel.suman@xxxxxxx>");
+MODULE_ALIAS("platform:fsl-amix");
+MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/fsl/fsl_amix.h b/sound/soc/fsl/fsl_amix.h
new file mode 100644
index 0000000..5312683
--- /dev/null
+++ b/sound/soc/fsl/fsl_amix.h
@@ -0,0 +1,101 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * NXP AMIX ALSA SoC Digital Audio Interface (DAI) driver
+ *
+ * Copyright 2017 NXP
+ */
+
+#ifndef __FSL_AMIX_H
+#define __FSL_AMIX_H
+
+#define FSL_AMIX_FORMATS (SNDRV_PCM_FMTBIT_S16_LE |\
+ SNDRV_PCM_FMTBIT_S24_LE |\
+ SNDRV_PCM_FMTBIT_S32_LE)
+/* AMIX Registers */
+#define FSL_AMIX_CTR 0x200 /* Control */
+#define FSL_AMIX_STR 0x204 /* Status */
+
+#define FSL_AMIX_ATCR0 0x208 /* Attenuation Control */
+#define FSL_AMIX_ATIVAL0 0x20c /* Attenuation Initial Value */
+#define FSL_AMIX_ATSTPUP0 0x210 /* Attenuation step up factor */
+#define FSL_AMIX_ATSTPDN0 0x214 /* Attenuation step down factor */
+#define FSL_AMIX_ATSTPTGT0 0x218 /* Attenuation step target */
+#define FSL_AMIX_ATTNVAL0 0x21c /* Attenuation Value */
+#define FSL_AMIX_ATSTP0 0x220 /* Attenuation step number */
+
+#define FSL_AMIX_ATCR1 0x228 /* Attenuation Control */
+#define FSL_AMIX_ATIVAL1 0x22c /* Attenuation Initial Value */
+#define FSL_AMIX_ATSTPUP1 0x230 /* Attenuation step up factor */
+#define FSL_AMIX_ATSTPDN1 0x234 /* Attenuation step down factor */
+#define FSL_AMIX_ATSTPTGT1 0x238 /* Attenuation step target */
+#define FSL_AMIX_ATTNVAL1 0x23c /* Attenuation Value */
+#define FSL_AMIX_ATSTP1 0x240 /* Attenuation step number */
+
+/* AMIX Control Register */
+#define FSL_AMIX_CTR_MIXCLK_SHIFT 0
+#define FSL_AMIX_CTR_MIXCLK_MASK BIT(FSL_AMIX_CTR_MIXCLK_SHIFT)
+#define FSL_AMIX_CTR_MIXCLK(i) ((i) << FSL_AMIX_CTR_MIXCLK_SHIFT)
+#define FSL_AMIX_CTR_OUTSRC_SHIFT 1
+#define FSL_AMIX_CTR_OUTSRC_MASK (0x3 << FSL_AMIX_CTR_OUTSRC_SHIFT)
+#define FSL_AMIX_CTR_OUTSRC(i) (((i) << FSL_AMIX_CTR_OUTSRC_SHIFT) \
+ & FSL_AMIX_CTR_OUTSRC_MASK)
+#define FSL_AMIX_CTR_OUTWIDTH_SHIFT 3
+#define FSL_AMIX_CTR_OUTWIDTH_MASK (0x7 << FSL_AMIX_CTR_OUTWIDTH_SHIFT)
+#define FSL_AMIX_CTR_OUTWIDTH(i) (((i) << FSL_AMIX_CTR_OUTWIDTH_SHIFT) \
+ & FSL_AMIX_CTR_OUTWIDTH_MASK)
+#define FSL_AMIX_CTR_OUTCKPOL_SHIFT 6
+#define FSL_AMIX_CTR_OUTCKPOL_MASK BIT(FSL_AMIX_CTR_OUTCKPOL_SHIFT)
+#define FSL_AMIX_CTR_OUTCKPOL(i) ((i) << FSL_AMIX_CTR_OUTCKPOL_SHIFT)
+#define FSL_AMIX_CTR_MASKRTDF_SHIFT 7
+#define FSL_AMIX_CTR_MASKRTDF_MASK BIT(FSL_AMIX_CTR_MASKRTDF_SHIFT)
+#define FSL_AMIX_CTR_MASKRTDF(i) ((i) << FSL_AMIX_CTR_MASKRTDF_SHIFT)
+#define FSL_AMIX_CTR_MASKCKDF_SHIFT 8
+#define FSL_AMIX_CTR_MASKCKDF_MASK BIT(FSL_AMIX_CTR_MASKCKDF_SHIFT)
+#define FSL_AMIX_CTR_MASKCKDF(i) ((i) << FSL_AMIX_CTR_MASKCKDF_SHIFT)
+#define FSL_AMIX_CTR_SYNCMODE_SHIFT 9
+#define FSL_AMIX_CTR_SYNCMODE_MASK BIT(FSL_AMIX_CTR_SYNCMODE_SHIFT)
+#define FSL_AMIX_CTR_SYNCMODE(i) ((i) << FSL_AMIX_CTR_SYNCMODE_SHIFT)
+#define FSL_AMIX_CTR_SYNCSRC_SHIFT 10
+#define FSL_AMIX_CTR_SYNCSRC_MASK BIT(FSL_AMIX_CTR_SYNCSRC_SHIFT)
+#define FSL_AMIX_CTR_SYNCSRC(i) ((i) << FSL_AMIX_CTR_SYNCSRC_SHIFT)
+
+/* AMIX Status Register */
+#define FSL_AMIX_STR_RATEDIFF BIT(0)
+#define FSL_AMIX_STR_CLKDIFF BIT(1)
+#define FSL_AMIX_STR_MIXSTAT_SHIFT 2
+#define FSL_AMIX_STR_MIXSTAT_MASK (0x3 << FSL_AMIX_STR_MIXSTAT_SHIFT)
+#define FSL_AMIX_STR_MIXSTAT(i) ((i & FSL_AMIX_STR_MIXSTAT_MASK) \
+ >> FSL_AMIX_STR_MIXSTAT_SHIFT)
+/* AMIX Attenuation Control Register */
+#define FSL_AMIX_ATCR_AT_EN BIT(0)
+#define FSL_AMIX_ATCR_AT_UPDN BIT(1)
+#define FSL_AMIX_ATCR_ATSTPDIF_SHIFT 2
+#define FSL_AMIX_ATCR_ATSTPDFI_MASK (0xfff << FSL_AMIX_ATCR_ATSTPDIF_SHIFT)
+
+/* AMIX Attenuation Initial Value Register */
+#define FSL_AMIX_ATIVAL_ATINVAL_MASK 0x3FFFF
+
+/* AMIX Attenuation Step Up Factor Register */
+#define FSL_AMIX_ATSTPUP_ATSTEPUP_MASK 0x3FFFF
+
+/* AMIX Attenuation Step Down Factor Register */
+#define FSL_AMIX_ATSTPDN_ATSTEPDN_MASK 0x3FFFF
+
+/* AMIX Attenuation Step Target Register */
+#define FSL_AMIX_ATSTPTGT_ATSTPTG_MASK 0x3FFFF
+
+/* AMIX Attenuation Value Register */
+#define FSL_AMIX_ATTNVAL_ATCURVAL_MASK 0x3FFFF
+
+/* AMIX Attenuation Step Number Register */
+#define FSL_AMIX_ATSTP_STPCTR_MASK 0x3FFFF
+
+#define FSL_AMIX_MAX_DAIS 2
+struct fsl_amix {
+ struct platform_device *pdev;
+ struct regmap *regmap;
+ struct clk *ipg_clk;
+ u8 tdms;
+};
+
+#endif /* __FSL_AMIX_H */
--
2.7.4